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Analysis of the Screw Flight Wear Model and Wear Regularity of the Bulk Transport in Screw Ship Unloader Iran. J. Sci. Technol. Trans. Mech. Eng. (IF 1.029) Pub Date : 2021-01-23 Weijie Yang, Wenjun Meng, Lingchong Gao, Yuan Tan, Johannes Fottner, Xiaobing Dai, Fenglin Yao, Yuan Yuan, Xiaoxia Sun
The screw flight, spiral blade welded on the axial cylinder, is the core component of the screw ship unloader and can be seriously worn by the materials during long-term conveying. The damaged screw flight will make the screw ship unloader unable to unload materials or even lead to an accident. However, the existing wear model cannot be directly applied to predict the wear of the screw flight under
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Vibration Feature Evaluation of the Motor-Gear System with Gear Tooth Crack and Rotor Bar Error Iran. J. Sci. Technol. Trans. Mech. Eng. (IF 1.029) Pub Date : 2021-01-22 Wenyu Bai, Qiang Zeng, Yawen Wang, Guojin Feng, Guanjun Bao
The high speed and high power density electromechanical system for the electric vehicle is urgently required to meet stricter emission regulation and achieve higher performance. Therefore, the electromechanical coupling effect is becoming more strengthened and may significantly degrade the performance of the motor and gear system. When gear or motor failures like gear tooth crack or rotor bar breakage
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Metaheuristic Optimization of Rotating Multilayer Composite Tubes Under Internal Heating and Pressure Iran. J. Sci. Technol. Trans. Mech. Eng. (IF 1.029) Pub Date : 2021-01-21 Saeid Kazemzadeh Azad, Tolga Akış
Although analysis/design of multilayer assemblies has been always an active field of research, works on the optimal design of rotating multilayer composite tubes are very limited. This paper addresses the design optimization of rotating multilayer composite tubes under internal heating and pressure. For determining the structural responses, analytical solutions are provided based on different boundary
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Reduction of Stress Variations on Sections (ROSVOS) for a Femoral Component Iran. J. Sci. Technol. Trans. Mech. Eng. (IF 1.029) Pub Date : 2021-01-18 Levent Uğur, Burak Ozturk, Fehmi Erzincanli
Total knee prostheses have become established arthroplasty applications in the treatment of damaged or weakened cartilage. New implants are being produced using bio-materials which are compatible with human tissue. In the industry, these prostheses are modeled and manufactured in different design geometries. This study investigated using a novel method for an ideal geometry designed to prevent fracture
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Love Wave Propagation in Viscoelastic Layer Sandwiched Between Fiber-reinforced Layer and Consistent Couple Stress Substrate Iran. J. Sci. Technol. Trans. Mech. Eng. (IF 1.029) Pub Date : 2021-01-11 Shikha Deep, Vikas Sharma
The problem deals with an investigation about propagation of Love type waves in a geometrical configuration which is composed of a viscoelastic layer sandwiched between fiber-reinforced layer and a substratum. The substratum is modeled using size-dependent consistent couple stress theory which involves a length scale parameter called characteristic length to capture the role of inner microstructures
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Free Vibration and Transmission Response Analysis for Torsional Vibration of Circular Annular Plate Iran. J. Sci. Technol. Trans. Mech. Eng. (IF 1.029) Pub Date : 2021-01-10 Wei Liu, HaiLong Sun, Qiang Zhao
In this paper, free vibration and transmission response for the torsional vibration of circular annular plate are presented. To the author’s knowledge, few studies can be found for the torsional vibration from wave standpoint. For this purpose, in this study, natural frequencies for the torsional vibration of annular plate with clamped–clamped and free–free boundaries are calculated. The natural frequencies
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Study on Noise Characteristics of Marine Centrifugal Pump Under Different Cavitation Stages Iran. J. Sci. Technol. Trans. Mech. Eng. (IF 1.029) Pub Date : 2021-01-06 Cui Dai, Zhipeng Ge, Liang Dong, Jiancheng Zhu
Based on judging the different stages of cavitation through high-speed photography experiments, this paper presents a strategy for analyzing the variation in noise under different cavitation stages using the BEM method and Proudman theory. A multi-field synchronous test bench for marine pump hydraulic performance, flow noise, cavitation performance and cavity distribution is built. The critical cavitation
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Simulation and Optimization of an Induced Charge Electrokinetic-Based Micromixer Iran. J. Sci. Technol. Trans. Mech. Eng. (IF 1.029) Pub Date : 2021-01-05 Niloofar Zare, Mohammad K. D. Manshadi, Reza Kamali
Micromixing has a wide range of biomedical and biochemical applications. Therefore, many researchers have studied this type of microfluidic devices and have attempted to propose a design with better efficiency. Micromixers are classified as passive and active based on their mixing method (whether external energy source is used to improve mixing or not). The active micromixers have attracted the attentions
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Adaptive Attitude Stabilization of Flexible Spacecraft with Fast Fixed-Time Convergence Iran. J. Sci. Technol. Trans. Mech. Eng. (IF 1.029) Pub Date : 2021-01-05 Seyed Majid Esmaeilzadeh, Mehdi Golestani, Afef Fekih
This paper proposes an adaptive attitude stabilization approach for flexible spacecraft subject to uncertainties, external disturbances, actuator saturation and unknown dynamics. The approach is synthesized based on a modified nonsingular fast terminal sliding surface (NFFTSS) and ensures fast and finite-time convergence independently of the initial states. It employs time-varying gains into the sliding
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Improving both Strength and Ductility of Al-7075 by combining Dual Equal Channel Lateral Extrusion with Aging Heat Treatment Iran. J. Sci. Technol. Trans. Mech. Eng. (IF 1.029) Pub Date : 2021-01-05 Farid Biniyazan, Hamid Soleimanimehr
Improving strength of Al-7075 by applying severe plastic deformation (SPD) leads to a drop in material ductility. The challenge of the present study is to achieve both strength and ductility improvement in Al-7075 by a combination of dual equal channel lateral extrusion (DECLE) and aging heat treatment. The design of experiment (DOE) was also used to obtain the first-order polynomial equations in order
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Free Vibration Characteristics of Rotating Functionally Graded Porous Circular Cylindrical Shells with Different Boundary Conditions Iran. J. Sci. Technol. Trans. Mech. Eng. (IF 1.029) Pub Date : 2020-11-28 Xuan-Hung Dang, Van-Loi Nguyen, Minh-Tu Tran, Bich-Phuong Nguyen Thi
The free vibration of rotating functionally graded porous (FGP) circular cylindrical shell with different boundary conditions is presented analytically in this study. The porous material properties are assumed to be graded in the thickness direction of the cylindrical shell according to three types of porosity distributions. By using Love’s shell theory and Hamilton’s principle, the governing equations
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Two-Point Incremental Forming of Metal–Polymer Three-Layer Sheets Iran. J. Sci. Technol. Trans. Mech. Eng. (IF 1.029) Pub Date : 2020-11-26 Mojtaba Esmailian, Khalil Khalili
Incremental forming process is a manufacturing process with many advantages, so it has received attention by many researchers, while further investigation is required for incremental forming of sandwich panels. In this study, the response surface method is employed to perform a series of experiments, and the effects of parameters, including vertical step down size, tool diameter, tool rotation speed
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Variational Principle and Approximate Solution for the Fractal Vibration Equation in a Microgravity Space Iran. J. Sci. Technol. Trans. Mech. Eng. (IF 1.029) Pub Date : 2020-11-24 Kang-Jia Wang
Under the microgravity space, many theories derived from the earth's surface become untenable, so a modified vibration equation with fractal derivative is presented in this work. With the help of the semi-inverse method, we successfully develop the fractal variational principle, which not only provides conservation laws in an energy form but also provides physical insight into the nature structures
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Film Cooling over Eroded Plates for the Injection of Air–Water Mist Coolant Iran. J. Sci. Technol. Trans. Mech. Eng. (IF 1.029) Pub Date : 2020-11-22 Jishnu Handique
A computational analysis was carried out on the film cooling technique over the surfaces of eroded plates. The air–water mist coolant was injected through the slotted hole. A flat plate was patterned with various erosions. The loading fraction, f = 4–16%, and blowing ratio, M = 1–1.6, were simulated to understand their influence on the mist film cooling effectiveness. The coolant injection angle or
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Application of Counter Rotating Rotors for Improving Performance of Savonius Turbines Iran. J. Sci. Technol. Trans. Mech. Eng. (IF 1.029) Pub Date : 2020-11-17 Vahid Etemadeasl, Rasool Esmaelnajad, Babak Farzaneh, Moharram Jafari
In this paper, a new configuration is proposed for using Savonius rotors by installing two Counter-Rotating Savonius Rotors (CRSR) together. In order to study the aerodynamic performance of the CRSR turbine, 2D unsteady turbulent flow around the CRSR turbine is simulated using commercial CFD software ANSYS-Fluent16.0. Turbulence modeling is done using \(k - \omega\) SST model. Numerical results demonstrate
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Effect of Geometric and Operational Parameters on the Performance of a Beta-Type Stirling Engine: A Numerical Study Iran. J. Sci. Technol. Trans. Mech. Eng. (IF 1.029) Pub Date : 2020-11-16 H. Raghavendra, P. Suryanarayana Raju, K. Hemachandra Reddy
This paper describes the development of a mathematical model for a beta-type Stirling engine with rhombic drive mechanism. This model is based on thermodynamics, heat transfer, mass transfer, and machine dynamics considerations, and it estimates the power output and efficiency of a beta-type Stirling engine depending on different geometric and operational variables. The model is used to conduct a parametric
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A New Beam Element for Static, Free and Forced Vibration Responses of Microbeams Resting on Viscoelastic Foundation Based on Modified Couple Stress and Third-Order Beam Theories Iran. J. Sci. Technol. Trans. Mech. Eng. (IF 1.029) Pub Date : 2020-11-11 Reza Damghanian, Kamran Asemi, Masoud Babaei
In this paper, a new beam element based on third-order Reddy beam theory and modified couple stress theory is introduced for static and dynamic analyses of microbeams. The beam is resting on Kelvin–Voigt-type viscoelastic foundation. Equilibrium equations are derived by using Hamilton’s principle. Galerkin finite element method is applied to the governing equations, and shape functions of the new beam
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A Cross Integration for von-Mises Plasticity Along with Nonlinear Isotropic Hardening and Lemaitre Damage Model Iran. J. Sci. Technol. Trans. Mech. Eng. (IF 1.029) Pub Date : 2020-11-04 Maliheh Tavoosi, Mehrzad Sharifian, Mehrdad Sharifian
What lies at the core of an elastoplastic finite element analysis is updating the stress and its related plastic variables. The process is carried out through integrating an array of elastoplastic fundamental relationships, which are typically called constitutive equations. The complex essence of such relations as well as the usual lack of analytical closed-form solutions to these problems compels
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Nonlinear Thermal Stability of Rotating Pre-twisted Temperature-Dependent FG Microblades Iran. J. Sci. Technol. Trans. Mech. Eng. (IF 1.029) Pub Date : 2020-11-03 Amin Ghorbani Shenas, Sima Ziaee, Parviz Malekzadeh
The main objective of this study is to investigate the post-buckling thermal load–deflection path of rotating pre-twisted microblades/beams made of temperature-dependent functionally graded materials (FGMs) via nonlinear non-classical first-order shear deformation theory (FSDT). To this end, modified strain gradient theory (MSGT) as well as the von Karman geometric nonlinearity is used to develop the
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Surface Characteristics and Cavitation Damage in 8090Al–Li Alloy by Using Cavitation Water Jet Peening Processing Iran. J. Sci. Technol. Trans. Mech. Eng. (IF 1.029) Pub Date : 2020-10-21 Joseph Sekyi-Ansah, Yun Wang, James Kwasi Quaisie, Fuzhu Li, Chao Yu, Emmanuel Asamoah, Hong Liu
The cavitation strengthening test of Aluminum lithium Alloy (8090Al–Li) was carried out with different pressure process parameters. The roughness, residual stress, and morphology of the treated samples were studied. A high dislocation density was formed in the cavitation area of the workpiece, which resulted in surfacing hardening. The cavitation effect occurred in the collapse area. It was beneficial
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An Experimental and Numerical Determination on Low-Velocity Impact Response of Hybrid Composite Laminate Iran. J. Sci. Technol. Trans. Mech. Eng. (IF 1.029) Pub Date : 2020-10-19 Engin Erbayrak, Ercument Ugur Yuncuoglu, Yusuf Kahraman, Beril Eker Gumus
In this study, experimental and numerical investigations were carried out in order to determine the mechanical properties and impact response of hybrid composite laminate. The hybrid composite laminate was formed from plain woven carbon fiber reinforced epoxy (CFRE) and plain woven glass fiber reinforced epoxy (GFRE) fiber using VARTM (vacuum-assisted resin transfer molding) process. The mechanical
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Effect of Curing Cycle on Fatigue Life of Cracked AA7075-T6 Aircraft Sheet Repaired with a Boron/Epoxy Composite Patch Iran. J. Sci. Technol. Trans. Mech. Eng. (IF 1.029) Pub Date : 2020-10-16 Malika Khodja, Hamida Fekirini, Gonasagren Govender, Belabbes Bachir Bouiadjra
Fatigue failure cracking under fluctuating stressing has been a major concern of engineering for many years. Fatigue failures have become more common and thereby significantly influencing engineering design as sources of vibration and dynamic loading of components have increased. The repairs of damaged metallic structures using bonded composite patch have been proved as an economical method to increase
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A Three-Dimensional Conjugate Heat Transfer Model of a Turbocharger Turbine Housing Iran. J. Sci. Technol. Trans. Mech. Eng. (IF 1.029) Pub Date : 2020-10-09 Sh. Alaviyoun, M. Ziabasharhagh, A. Mohammadi
The turbine housing is subjected to thermal load which is essential to be taken into account in the design process. In this paper, a three-dimensional conjugate heat transfer simulation of a wastegated turbine housing has been performed. The model has been validated with data from thermocouple measurements and thermography pictures. Moreover, the effect of ventilation speed on temperature distribution
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Nonlinear Thermal Stress Analysis of Functionally Graded Thick Cylinders and Spheres Iran. J. Sci. Technol. Trans. Mech. Eng. (IF 1.029) Pub Date : 2020-10-08 Durmuş Yarimpabuç
Nonlinear thermal stress analysis in a functionally graded hollow thick cylinders and spheres under the effect of high temperatures and temperature differences is considered by taking into account the material properties of the body both temperature dependent and radially graded, except Poisson’s ratio which is taken to be constant for simplicity. These conditions result in nonlinear governing differential
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Configuration Design of Single-Loop Non-overconstrained Mechanism with Inactive Joints Iran. J. Sci. Technol. Trans. Mech. Eng. (IF 1.029) Pub Date : 2020-10-07 Jiali Liu, Yong Xu, Yong Liu, Haoran Shi, Xinyang Jiang
In order to weaken the strict geometric constraint relationship between the axes of joints so as to reduce manufacturing/assembling errors of overconstrained mechanism, a configuration design methodology for single-loop non-overconstrained mechanism with inactive joints is proposed in this paper based on the screw theory. After completing analysis of degrees of freedom, the design principle and corresponding
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The Effect of Different Environmental Condition on Flexural Strength and Fatigue Behavior of E-Glass/Epoxy Composites Iran. J. Sci. Technol. Trans. Mech. Eng. (IF 1.029) Pub Date : 2020-10-04 H. Ersen Balcıoğlu, Raif Sakin, Halit Gün
The composite materials exposed to dynamic loads may suffer damage at strength value, which is under own yield strengths. Also, improper environmental conditions accelerate the damage process. In this study, the effect of heavy chemical environments such as acid and alkaline and retaining time for these environments on flexural strength and fatigue behavior of E-glass/epoxy laminated composites was
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Generalized Thermoelastic Waves Propagation in Non-uniform Rational B-spline Rods Under Quadratic Thermal Shock Loading Using Isogeometric Approach Iran. J. Sci. Technol. Trans. Mech. Eng. (IF 1.029) Pub Date : 2020-10-03 Ahmad Yavari, Mohammad Hossein Abolbashari
Generalized thermoelasticity based on Lord–Shulman theory that admits the second sound effect is developed for continuum-based modeling of the thermoelastic wave propagation in functionally graded material (FGM) rods with a variable cross-sectional area under quadratic thermal shock loading. The geometry of the problem, as well as the distribution of material properties, is defined continuously with
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Analysis of the Effect of Various Impeller Blade Angles on Characteristic of the Axial Pump with Pressure Fluctuations Based on Time- and Frequency-Domain Investigations Iran. J. Sci. Technol. Trans. Mech. Eng. (IF 1.029) Pub Date : 2020-09-28 Ahmed Ramadhan Al-Obaidi
In this work, the behaviors of flow field and pressure fluctuations in both time and frequency domains in an axial flow pump through changing various impeller blade angles are studied and investigated by using a CFD technique. The blade angles are changed between 30°, 45º, 60º and 75º. Numerical results are validated with the experimental values, as a good agreement was found between them. The developed
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Large Amplitude Free Vibrations of FGM Beams on Nonlinear Elastic Foundation in Thermal Field Based on Neutral/Mid-plane Formulations Iran. J. Sci. Technol. Trans. Mech. Eng. (IF 1.029) Pub Date : 2020-09-01 Hadi Babaei, Yaser Kiani, Mohammad Reza Eslami
The present research deals with the small and large amplitude free vibrations of thick functionally graded material (FGM) beams. Beams are resting on an elastic foundation which consists of the Winkler layer, shear layer and nonlinear springs. The effect of uniform temperature elevation is also included into the formulation. A third-order shear deformation beam theory is adopted as the basic assumption
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Biomechanical, Structural and Performance Analysis of a Specific Type of Cardiac Assist Device Used in Left Ventricular Failures Iran. J. Sci. Technol. Trans. Mech. Eng. (IF 1.029) Pub Date : 2020-07-13 Shahrokh Rahmani, Alireza Heidari, Behdad Saed, Adel Mahpour, Mahdi Navidbakhsh, Mansour Alizadeh
This article investigates a specific type of cardiac assist device, its functional performance, and its effects on the hemodynamic patterns of blood flow through the aortic network. The aforementioned assist device can be implanted in a given patient suffering from left ventricular failure. Our previous study focused on multi-balloons device. The current cardiac assist device is composed of two semi-cylindrical
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WC-Reinforced Inconel 625 Superalloy Matrix Composites Iran. J. Sci. Technol. Trans. Mech. Eng. (IF 1.029) Pub Date : 2020-03-03 Ozgur Ozgun
In this study, Inconel 625 superalloy matrix composite materials were produced via powder metallurgy by using high-purity elemental powders and wolfram carbide (WC) reinforcement. The powder mixtures were shaped by applying 500 MPa pressure. The sintering process was carried out at 1275 °C under argon atmosphere with 90 min holding time. The densities of the produced samples were determined according
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Improving Performance of a Photovoltaic Panel by Pin Fins: A Theoretical Analysis Iran. J. Sci. Technol. Trans. Mech. Eng. (IF 1.029) Pub Date : 2019-10-21 A. Sedaghat, M. R. Karami, M. Eslami
As efficiency of PV modules decreases with temperature rise, cooling methods can increase the power output and efficiency. One of the strategies for this purpose is passive cooling by implementing fins to the backside of a module. In the present study, annual energy output of a 50 W panel is analytically calculated in two unfinned and pin-finned cases based on hourly meteorological data for Shiraz
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Performance Evaluation and Calibration of Gantry-Tau Parallel Mechanism Iran. J. Sci. Technol. Trans. Mech. Eng. (IF 1.029) Pub Date : 2019-10-05 Mohammad Reza Chalak Qazani, Siamak Pedrammehr, Hamid Abdi, Saeid Nahavandi
The Gantry-Tau is a family of parallel manipulators with three linear actuators. This mechanism is of interest for various applications because of the large workspace and its performance in terms of high acceleration, precision, and stiffness characteristics. This paper presents workspace analysis and calibration for a Gantry-Tau mechanism using its forward kinematics. The mathematical model of the
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FSDT-Based Isogeometric Analysis for Free Vibration Behavior of Functionally Graded Skew Folded Plates Iran. J. Sci. Technol. Trans. Mech. Eng. (IF 1.029) Pub Date : 2019-10-05 H. Mohammadi, A. R. Setoodeh
In this paper, an isogeometric analysis (IGA) approach for free vibration analysis of functionally graded skew folded (FGSF) plates is presented for the first time. This method uses non-uniform rational B-splines (NURBS) as basis functions to provide a flexibility in refinement process. Furthermore, the IGA is able to exactly regenerate the geometry in comparison with the finite-element method (FEM)
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Experimental Analysis of Semi-autogenous Grinding Mill Characteristics Under Different Working Conditions Iran. J. Sci. Technol. Trans. Mech. Eng. (IF 1.029) Pub Date : 2019-10-04 Ali Dorkhah, Alireza Arab Solghar, Masoud Rezaeizadeh
In the present work, vibration, acoustic and thermal signals were correlated to the semi-autogenous grinding mill working parameters such as total power and inlet water flow rate, and then these parameters were monitored using vibration, acoustic and thermal analyses. Next, the influential controlling parameters were obtained to monitor the mill conditions via SPSS software and afterward by exploiting
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Free Vibration Analysis for a Tactile Feedback Device of a Piezoelectric Ciliary Body Beam Iran. J. Sci. Technol. Trans. Mech. Eng. (IF 1.029) Pub Date : 2019-10-04 Jichun Xing, Dechun Liu
A tactile feedback device of a piezoelectric ciliary body beam is presented. In order to investigate the relationship between the sizes of the ciliary body beam, the position of the piezoelectric ceramics plates and the frequency of the excitation signal, the electromechanical coupling dynamic model of the piezoelectric ciliary body beam is established. According to the boundary conditions and the
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Reducing Stress Concentration Around a Hole in a Thin-Wall Cylinder Subjected to Internal Pressure Using Piezoelectric Patches Iran. J. Sci. Technol. Trans. Mech. Eng. (IF 1.029) Pub Date : 2019-10-03 S. M. R. Allahyari, S. Golabi
Decreasing stress in a part or piece of equipment especially in a stress concentration point without increasing thickness or using stronger material is always an interesting issue for design engineers. In this paper, piezoelectric patches were used for stress concentration reduction around various hole sizes in thin-walled cylindrical shells subjected to internal pressure. Applied voltage to piezoelectric
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Investigations of Flow Phenomena Over a Flat Plate and NACA0012 Airfoil at High Angles of Attack Iran. J. Sci. Technol. Trans. Mech. Eng. (IF 1.029) Pub Date : 2019-09-25 Shailesh Kr Jha, Uddipta Gautam, Pramod Pawar, S. Narayanan, L. A. Kumaraswamidhas
In the present study, the flow and aerodynamic features of a sharp trailing edged flat plate airfoil are systematically compared with NACA0012 airfoil. The studies are conducted for three different Reynolds numbers 1.89 × 105, 2.83 × 105 and 3.78 × 105 and angles of attack 20°, 25° and 30°. The present study shows that the occurrence of vortex shedding phenomena for the flat plate is substantially
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Influence of Restraint Load on Injury Biomechanics in Frontal Impact Based on Dummy Test Iran. J. Sci. Technol. Trans. Mech. Eng. (IF 1.029) Pub Date : 2019-09-21 Sen Xiao, Yanchao Qie, Jing Huang, Jikuang Yang, Jeff Crandall
Restraint system, especially the seatbelt, is the critical load source of the chest injury. The consequence has become the crucial part of the traffic accident, which is a great burden to the society in terms of money loss. Thus, when protecting the occupant’s safety, chest injuries from the restraint loading on the occupants should also be reduced or avoided with proper methodology during the impact
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Plastic Buckling and Postbuckling Analysis of Plates Using 3D Incompatible and Standard Elements Iran. J. Sci. Technol. Trans. Mech. Eng. (IF 1.029) Pub Date : 2019-09-17 Hamed Mahmoud Soltani, Mahsa Kharazi
In the current study, plastic buckling and postbuckling behavior of aluminum alloy plates under uniaxial, biaxial and combined compressive/shear loadings using 3D standard and incompatible elements are investigated. In this study, the finite element code considering geometrically and material nonlinearities is developed based on the incremental theory of plasticity. Obtained results show that the bifurcation
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FDM-based 2D Numerical Study of Hyperthermia Cancer Treatment by Micro/Nano-Phase-Change Materials Iran. J. Sci. Technol. Trans. Mech. Eng. (IF 1.029) Pub Date : 2019-09-10 Ali Asghar Taheri, Faramarz Talati
Hyperthermia is one of the methods for cancer therapies by creating artificial fever. Protection of healthy tissues around the tumor tissue, which has a high temperature, is one of the major issues in this treatment. In present study, the two-dimensional transient model of biological tissue with a tumor is taken into account. The area of the tumor is embedded with micro/nano superparamagnetic materials
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Wave Propagation of Generalized Magneto-Thermoelastic Interactions in an Elastic Medium Under Influence of Initial Stress Iran. J. Sci. Technol. Trans. Mech. Eng. (IF 1.029) Pub Date : 2019-09-09 Kh. Lotfy, A. A. El-Bary
Magneto-thermoelastic interactions in an isotropic homogeneous elastic half-space with two temperatures are studied using mathematical methods under the purview of the Lord–Şhulman (LS) and Green–Lindsay (GL) theories, as well as the classical dynamical coupled theory (CD). The medium is considered to be permeated by a uniform magnetic field. The general solution obtained is applied to a specific problem
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Numerical Simulation of Tri-layer Interface Cracks in Piezoelectric Materials Using Extended Finite Element Method Iran. J. Sci. Technol. Trans. Mech. Eng. (IF 1.029) Pub Date : 2019-08-05 G. Pamnani, S. Bhattacharya, S. Sanyal
Piezoelectric materials have wide applications due to their special electromechanical coupling characteristics but are vulnerable to sudden failure because of their brittle nature. Researchers have been profoundly interested in investigating the fracture of piezoelectric materials under different applied conditions. In the present work, tri-layer plates with interface cracks in piezoelectric materials
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A New Approach of Wear Mechanism Map in Turning Inconel718 with PVD-Coated Inserts Using Advanced Techniques Iran. J. Sci. Technol. Trans. Mech. Eng. (IF 1.029) Pub Date : 2019-08-02 B. Movahedi, R. Mokhtari Homami, S. Akhavan
In this paper, the relationship between the cutting conditions and the wear mechanisms in turning Inconel718 from both modeling and experiment points of view has been studied. The tool chosen consists of a hard fine-grained WC with 6% Co with TiAlN layer. As a result, the recommended machining conditions with minimal wear would be the selection of a tool with a radius of 1.6 mm and the cutting velocity
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Nonlinear Vibration and Stability Analysis of Viscoelastic Rayleigh Beams Axially Moving on a Flexible Intermediate Support Iran. J. Sci. Technol. Trans. Mech. Eng. (IF 1.029) Pub Date : 2019-07-22 Rana Farshbaf Zinati, Mousa Rezaee, Saeed Lotfan
In this study, the nonlinear vibration and stability of a simply supported axially moving Rayleigh viscoelastic beam equipped with an intermediate nonlinear support are investigated. The type of considered nonlinearity is geometric and is due to the axial stretching. The Kelvin–Voigt model is used to regard the beam internal damping. The Hamilton’s principle is employed to derive the governing equations
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A More Realistic Replica of a Walking Biped for Implying Dynamics and Control on Ascending and Descending Stairs by Considering Self-impact Joint Constraint Iran. J. Sci. Technol. Trans. Mech. Eng. (IF 1.029) Pub Date : 2019-07-12 Yousof Bazargan-Lari, Ahmad Reza Khoogar
The aim of this study was to bring forth a model-based control method for trajectory tracking of a normal human-like biped on descending and ascending stairs using the straight knee state and to verify the controller performance in the straight knee state periods. Contemplating a straight state in knee joints does not consent to each leg’s shank link to undertake angular rotations greater than thigh
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Performance Evaluation of a Combined Heat and Power System with Stirling Engine for Residential Applications Iran. J. Sci. Technol. Trans. Mech. Eng. (IF 1.029) Pub Date : 2019-07-10 Mohammad Sheykhi, Mahmood Chahartaghi, Seyed Majid Hashemian
A combined heating and power (CHP) system with a Stirling engine for building applications has been proposed in the present work. The use of these systems in building applications will be more common if they have significant advantages from the viewpoints of the pollution emission and operational cost in comparison with the other similar systems. The Stirling engine was modeled with consideration of
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Investigation of Floating and Single-Action Dies in Producing Dense Compacts with High Aspect Ratio Iran. J. Sci. Technol. Trans. Mech. Eng. (IF 1.029) Pub Date : 2019-06-24 H. Homayoun, M. Shahbaz, R. Ebrahimi
In this study, the commercially pure aluminum powder was compacted by single-action and floating dies at room temperature. The effect of compaction method on densification was studied using density distribution, microhardness measurements and scanning electron microscope (SEM) along the compaction axis of processed samples. The density measurements of compacted samples through the floating die process
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3-D Dynamic Modeling and Validation of Human Arm for Torque Determination During Eating Activity Using Kane’s Method Iran. J. Sci. Technol. Trans. Mech. Eng. (IF 1.029) Pub Date : 2019-06-03 Zakia Hussain, Norsinnira Zainul Azlan
Upper limb disability is one of the major adversities faced by post-stroke patients. Eating is one of the fundamental activities of survival for all living beings. The robotic rehabilitation systems for people with upper limb disabilities must have the capability of assisting the patients, providing appropriate forces/torques, during various eating activities. In this study, a 3-D, four-DOF dynamic
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Effect of the PTO Damping Force on the 2D Oscillating Buoy Wave Energy Converter Integrated into a Pile-Restrained Floating Breakwater Iran. J. Sci. Technol. Trans. Mech. Eng. (IF 1.029) Pub Date : 2019-05-27 Zhe Ma, Yanjun Mao, Yong Cheng, Gangjun Zhai
The aim of the study is to evaluate the parametric effect of a power take-off (PTO) system on an integration system of an oscillating buoy wave energy device with a pile-restrained floating breakwater. To consider the viscous effect, the study is carried out with three conditions using OpenFOAM, i.e., the linear optimal PTO system, the fixed PTO damping coefficient, and the Coulomb PTO system. The
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Second Strain Gradient Finite Element Analysis of Vibratory Nanostructures Based on the Three-Dimensional Elasticity Theory Iran. J. Sci. Technol. Trans. Mech. Eng. (IF 1.029) Pub Date : 2019-05-24 Jalal Torabi, Reza Ansari, Majid Bazdid-Vahdati, Mansour Darvizeh
By introducing the \(C^{2}\) continuous hexahedral element, the free vibration finite element analysis of the nanobeam and nanoplate structures is reported based on the second strain gradient (SSG) theory and three-dimensional elasticity model. The SSG elasticity presents the powerful higher-order continuum theory which can be efficiently used to capture the size-effect on the nano-objects. The finite
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Design, Modeling and Experiment of a Novel Synchronous Belt Drive with Noncircular Pulleys Iran. J. Sci. Technol. Trans. Mech. Eng. (IF 1.029) Pub Date : 2019-05-24 JianNeng Chen, Jun Ye, Ying Wang, XinCheng Sun, XuDong Xia, XiaoJing He
The synchronous belt drive with noncircular pulleys can be used to obtain accurate transmission with a specific motion law, but the shortage of big belt slack caused by noncircular pulleys limits its application. In order to reduce the belt slack, a novel synchronous belt drive with noncircular pulleys, which is formed by a driving circular pulley, a driven eccentric pulley and a noncircular tension
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A Numerical Investigation into the Primary Resonant Dynamics of Magneto-Electro-Thermo-Elastic Plates Iran. J. Sci. Technol. Trans. Mech. Eng. (IF 1.029) Pub Date : 2019-05-04 R. Gholami, R. Ansari, H. Rouhi
The geometrically nonlinear forced vibration response of magneto-electro-thermo-elastic (METE) rectangular plates is analyzed herein using a numerical approach. The shear deformation effect is taken into account based on the first-order shear deformation plate theory. The geometrical nonlinearity is also considered using the von Kármán hypothesis. Based upon a variational approach, the energy functional
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On the Efficiency of SLAM Using Adaptive Unscented Kalman Filter Iran. J. Sci. Technol. Trans. Mech. Eng. (IF 1.029) Pub Date : 2019-05-04 Masoud Sotoodeh Bahraini
In this paper, an adaptive unscented Kalman filter (AUKF) algorithm is applied to simultaneous localization and mapping (SLAM), based on adaptation of a scaling parameter. The scaling parameter is a design parameter in the unscented Kalman filter (UKF) which can improve the quality of the approximation. An adaptive method is designed to find the suitable value for the scaling parameter to improve the
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Effect of Ignition Timing and Hydrogen Fraction in Natural Gas Blend on Performance and Exhaust Emissions in a DI Engine Iran. J. Sci. Technol. Trans. Mech. Eng. (IF 1.029) Pub Date : 2019-04-27 Javad Zareei, Abbas Rohani, Wan Mohd Faizal Bin Wan Mahmood, Shahrir Abdullah
The aim of the study was to investigate the effect of ignition timing and hydrogen fraction on the performance and exhaust emissions of an engine. The engine was converted from port injection system to direct injection with enrichment hydrogen to natural gas at WOT condition and engine operation at 4000 rpm. The results showed that when hydrogen volume fraction was raised from 0 up to 50% at 20 bar
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Experimental Investigation into the Energy Absorption of Composite-metal Tubes Subjected to Lateral Load Iran. J. Sci. Technol. Trans. Mech. Eng. (IF 1.029) Pub Date : 2019-04-26 Jafar Rouzegar, Abbas Niknejad, Seyed Mohammad Elahi, Seyed Ahmad Elahi, Seyed Ali Elahi
This paper studies the flattening process of empty and polyurethane foam-filled composite-metal tubes, experimentally. To prepare these specimens, metal tubes were wrapped with a fiber-reinforced composite using hand layup method. For the metal tubes, two kinds of materials, aluminum and brass, were used, and the composite tubes were made of woven E-glass fiber and vinyl ester resin. A composite tube
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Dynamic Analysis of Laminated Composite Plate Integrated with a Piezoelectric Actuator Using Four-Variable Refined Plate Theory Iran. J. Sci. Technol. Trans. Mech. Eng. (IF 1.029) Pub Date : 2019-04-04 Jafar Rouzegar, Roya Koohpeima, Farhad Abad
This paper presents an analytical solution based on four-variable refined plate theory for dynamic analysis of cross-ply composite laminates integrated with piezoelectric fiber-reinforced composite actuator attached to the upper surface. This theory considers parabolic transverse shear strains through the plate thickness. Equations of motion for simply supported rectangular plates are derived using
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Dynamic Modeling, Control System Design and MIL–HIL Tests of an Unmanned Rotorcraft Using Novel Low-Cost Flight Control System Iran. J. Sci. Technol. Trans. Mech. Eng. (IF 1.029) Pub Date : 2019-03-28 Mohammad Hossein Khalesi, Hassan Salarieh, Mahmoud Saadat Foumani
Unmanned helicopters have gained great importance during recent years due to their special abilities such as hover flight, vertical take-off and landing, maneuverability and superior agility. The advances in electronic devices technologies lead to more powerful and lighter processors to be used in avionic systems which have attracted more attention to these UAVs. The first steps of utilizing an unmanned
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Inverse Dynamic Analysis of an Inclined FGM Beam Due to Moving Load for Estimating the Mass of Moving Load Based on a CGM Iran. J. Sci. Technol. Trans. Mech. Eng. (IF 1.029) Pub Date : 2019-03-26 Vahid Shokouhifard, Saeedreza Mohebpour, Parviz Malekzadeh, Mohammadreza Golbaharhaghighi
In this paper, the use of the inverse solution method for estimating the mass of moving load on an inclined functionally graded material (FGM) Timoshenko beam is discussed based on the measured displacements. Fletcher–Reeves (FR) method is used to solve the inverse problem. Also, in the process of solving the inverse problem and in order to solve the direct problem, Newmark method is applied for discretization
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Dynamic Analysis of Planetary Gear Transmission System Considering the Flexibility of Internal Ring Gear Iran. J. Sci. Technol. Trans. Mech. Eng. (IF 1.029) Pub Date : 2019-03-22 Zhixin Fan, Caichao Zhu, Chaosheng Song
A rigid-flexible coupled dynamic model of the planetary gear transmission system was developed considering the flexibility of the internal ring gear (flexible internal ring gear) and the sun shaft based on the shell theory and Timoshenko beam theory, respectively. For the dynamic modeling, the time-varying meshing stiffness and static transmission error excitations were considered and the Runge–Kutta