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Topology optimization of buildings subjected to stochastic wind loads Probab. Eng. Mech. (IF 2.411) Pub Date : 2021-02-28 Fernando Gomez; Billie F. Spencer; Juan Carrion
Traditionally, the main structural system of tall buildings is designed iteratively to resist extreme wind loads, which provides safe, but typically suboptimal building systems. Topology optimization provides a general approach to obtain optimal material layout to carry the required load within specified design constraints. The wind loading on a structure is typically modeled as an equivalent static
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Numerical investigation on flow instabilities in low-pressure steam turbine last stage under different low-load conditions Proc. Inst. Mech. Eng. Part A J. Power Energy (IF 1.563) Pub Date : 2021-02-27 Ping Hu; Tong Lin; Rui Yang; Xiaocheng Zhu; Zhaohui Du
The modern power generation system requires steam turbines operating at flexible operating points, and flow instabilities readily occur in the low-pressure (LP) last stage under low-load conditions, which may cause failure of the last stage moving blades. Some studies have shown that within this operating range, a shift of the operating point may lead to flow instabilities. Numerical simulation has
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The impact of volute aspect ratio and tilt on the performance of a mixed flow turbine Proc. Inst. Mech. Eng. Part A J. Power Energy (IF 1.563) Pub Date : 2021-02-27 Samuel P Lee; Simon M Barrans; Ambrose K Nickson
Current trends in the automotive industry towards engine downsizing means turbocharging now plays a vital role in engine performance. The purpose of turbocharging is to increase the engine inlet air density by utilising, the otherwise wasted energy in the exhaust gas. This energy extraction is commonly accomplished through the use of a radial turbine. Although less commonly used, mixed flow turbines
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Ultralight micro-perforated sandwich panel with hierarchical honeycomb core for sound absorption J. Sandw. Struct. Mater. (IF 5.616) Pub Date : 2021-02-27 Wei He; Xiangjun Peng; Fengxian Xin; Tian Jian Lu
A theoretical model is developed to study the superior sound absorption performance of ultralight mirco-perforated sandwich panels with double-layer hierarchical honeycomb core. Numerical simulations are performed to validate theoretical model predictions and explore physical mechanisms underlying the sound absorption. Systematic parametric study is implemented to investigate the influence of specific
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Vertically-aligned short E-glass fibre core sandwich composite: Production and evaluation J. Sandw. Struct. Mater. (IF 5.616) Pub Date : 2021-02-27 Robbie White; Venkata R Machavaram; Benjamin A Fernando; Mark A Paget; Ashwini Prasad; Gerard F Fernando
This paper reports on the production and evaluation of a new class of “Z-axis” composite sandwich panel where the core consists of a dense array of vertically-aligned, 3 mm long E-glass fibre composite “beams”. The E-glass fibre bundles were aligned using electrostatic charging. A procedure was developed to retain the orientation of the short-fibre bundles whilst they were impregnated and cured with
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Prediction of acoustic wave transmission features of the multilayered plate constructions: A review J. Sandw. Struct. Mater. (IF 5.616) Pub Date : 2021-02-27 MR Zarastvand; M Ghassabi; R Talebitooti
This study collects all of the existent papers in the field of acoustic transmission across multilayered plate constructions. Herewith, a comprehensive source is proposed wherein approximately 410 references are reviewed and described from the first 1949 to 2020. In the first part, in addition to the presentation of a complete explanation about the importance of the acoustic analysis of these structures
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Influence of dynamic attitudes on oil supply for bearings and churning power losses in a splash lubricated spiral bevel gearbox Tribol. Int. (IF 4.271) Pub Date : 2021-02-27 Xiaozhou Hu; Ao Wang; Pingping Li; Jianing Wang
To study the influence of dynamic flight attitudes on the splash lubrication performance and churning power losses of the intermediate spiral bevel gearbox in a helicopter, a three-dimensional(3D) simulation model consisting of a spiral bevel gear pair, two bearing caps with oil guide holes and the housing is established, and CFD (Computational Fluid Dynamics) simulations with main flight attitudes
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Thermal field prediction for welding paths in multi-layer gas metal arc welding-based additive manufacturing: A machine learning approach J. Manuf. Process. (IF 4.086) Pub Date : 2021-02-26 Zeyu Zhou; Hongyao Shen; Bing Liu; Wangzhe Du; Jiaao Jin
Gas metal arc welding (GMAW)-based additive manufacturing (AM) is a key metal 3D printing technology for the fabrication of near-net shape parts. The thermal history of the multi-layer GMAW-based AM process has a significant influence on part quality and substrate deformations, but it is computationally expensive to accurately calculate it based on numerical method or analytical method. Existing data-driven
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An investigation of in situ impregnation for additive manufacturing of thermoplastic composites J. Manuf. Process. (IF 4.086) Pub Date : 2021-02-26 Daniel Kaczmarek; Daniel Walczyk; James Garofalo; Margaret Sobkowicz-Kline
Due to the increasing popularity of additive manufacturing with continuous fibers thermoplastic composites (TPC), this paper investigates the process of in situ impregnation of dry fiber tow with molten thermoplastic resin as a means to reduce material cost. To better understand impregnation with high-viscosity polymer melts, a 1D version of Darcy’s Law is derived along with Gebart’s equations for
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Experimental and numerical thermo-mechanical analysis of wire-based laser metal deposition of Al-Mg alloys J. Manuf. Process. (IF 4.086) Pub Date : 2021-02-26 Frederic E. Bock; Jan Herrnring; Martin Froend; Josephin Enz; Nikolai Kashaev; Benjamin Klusemann
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The effects of through tool cryogenic machining on the hole quality in GLARE® fibre metal laminates J. Manuf. Process. (IF 4.086) Pub Date : 2021-02-27 Khaled Giasin; Alisha Dad; Emmanuel Brousseau; Danil Pimenov; Mozammel Mia; Sezer Morkavuk; Ugur Koklu
GLARE® is a composite-metal laminate currently used in the Airbus A380 fuselage due to its excellent impact and fatigue performance. GLARE® undergo extensive drilling for riveting purposes making it prone to thermal effects and increased tool wear. Therefore, using coolants becomes necessary, however, conventional coolants can lead to moisture absorption. An alternative is to use cryogenic coolants
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Experimental Investigation of Plasma Cutting Two Separate Thin Steel Sheets Simultaneously and Parameters Optimisation Using Taguchi Approach J. Manuf. Process. (IF 4.086) Pub Date : 2021-02-27 Adel Gani; William Ion; Erfu Yang
This article investigates the ability of using plasma machining for cutting simultaneously two parallel thin layers at different gap distances. The main aim of this work is to identify whether this technology if mechanized can be more appropriate than using a circular saw to process a three-dimensional structure material such as double layers, box sections or rails. This research is aimed at those
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Study on hot cracking in laser welded joints of inconel 718 alloy foils J. Manuf. Process. (IF 4.086) Pub Date : 2021-02-27 Jian Lin; Xibo Wang; Yongping Lei; Ruigang Wei; Fu Guo
Pulsed laser welding was used to join ultra thin Inconel 718 alloy foils whose thickness was 0.2 mm. A fixture was designed to obtain the edge joint. The joint geometry and hot cracking were both observed on the cross sections. The relationship between the height, width of the joint and the energy density were fitted as linear functions. The effect of heat input on the hot cracking in the edge joint
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Prestrain-induced bandgap tuning in 3D-printed tensegrity-inspired lattice structures Extreme Mech. Lett. (IF 4.806) Pub Date : 2021-02-27 Kirsti Pajunen; Paolo Celli; Chiara Daraio
In this letter, we provide experimental evidence of bandgap tunability with global prestrain in additively-manufactured tensegrity-inspired lattice structures. These lattices are extremely lightweight and designed to exhibit a nonlinear compressive response that mimics that of a tensegrity structure. We fabricate them out of a stiff polymer but, owing to their peculiar design, they are compliant and
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Influence of post welding heat treatment on the microstructure and mechanical properties of friction stir welding joint of AZ31 Mg alloy Proc. Inst. Mech. Eng. E J. Process Mech. Eng. (IF 1.606) Pub Date : 2021-02-27 Kulwant Singh; Gurbhinder Singh; Harmeet Singh
At present, magnesium alloys are extensively used in numerous applications due to their light weight and better characteristics. Welding of magnesium alloys is regarded as one of the most complex phenomena in various industries. The friction stir welding of magnesium alloys has encouraged abundant scientific and industrial interest as it has the potency to form a good quality joint. Post welding heat
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Optimization of turn-milling process in roughing and finishing regimes: Trade-off between productivity, cutting force and surface integrity Proc. Inst. Mech. Eng. E J. Process Mech. Eng. (IF 1.606) Pub Date : 2021-02-27 Ebrahim Hosseini; Shafiqur Rehman; Ashkan Alimoradi
Turn-milling is a hybrid machining process which used benefits of interrupted cutting for proceeding of round bars. However, number of controllable parameters in the hybrid process is numerous that makes optimizing the process complicated. In the present study, an optimization work has been proposed to investigate the trade-off between production rate and cutting force in roughing regime as well surface
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Semi-active vibration control of a transmission system using a magneto-rheological variable stiffness and damping torsional vibration absorber Proc. Inst. Mech. Eng. Part D J. Automob. Eng. (IF 1.384) Pub Date : 2021-02-27 Wenfeng Li; Xiaomin Dong; Jun Xi; Xiong Deng; Kaiyuan Shi; Yaqin Zhou
In this research effort, an innovative magneto-rheological variable stiffness and damping torsional vibration absorber (MR-VSDTVB) is proposed, and independent variable damping control and independent variable stiffness control are adopted to suppress the torsional vibration of the transmission system. MR-VSDTVB, based on semi-active control principle, exhibits a compact structure and integrates with
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MATLAB-based general approach for square-root extended-unscented and fifth-degree cubature Kalman filtering methods Eur. J. Control (IF 1.54) Pub Date : 2021-01-30 M.V. Kulikova; G.Yu. Kulikov
A stable square-root approach has been recently proposed for the unscented Kalman filter (UKF) and fifth-degree cubature Kalman filter (5D-CKF) as well as for the mixed-type methods consisting of the extended Kalman filter (EKF) time update and the UKF/5D-CKF measurement update steps. The mixed-type estimators provide a good balance in trading between estimation accuracy and computational demand because
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Transformed orthogonal functions for solving infinite horizon fractional optimal control problems Eur. J. Control (IF 1.54) Pub Date : 2021-02-11 M. Shahini; M.A. Mehrpouya
In the present paper, an efficient numerical method for solution of infinite horizon fractional optimal control problems is investigated. The fractional derivative in such problems is considered in the Caputo sense. The methodology developed here, is based on utilizing transformed orthogonal functions to approximate the state and control functions directly. Thereby, the original problem is converted
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Robust prescribed-time stabilization for fuzzy sliding mode synchronization for uncertain chaotic systems Eur. J. Control (IF 1.54) Pub Date : 2021-02-10 Alain SOUP TEWA KAMMOGNE; Vannick FOPA MAWAMBA; Jacques KENGNE
This paper focuses on the problem of robust fuzzy sliding mode synchronization of uncertain nonlinear systems. A relevant fuzzy sliding mode control(FSMC) law is designed to force the state errors onto the specified surface. The prescribed-time boundedness (PTB) of the dynamical error is guaranteed by introducing the partitioning strategy. The chattering phenomenon, which is inherent to a conventional
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Nonlinear aeroelastic analysis of airfoil section under stall flutter oscillations and gust loads J. Fluids Struct. (IF 2.84) Pub Date : 2021-02-27 L.G.P. dos Santos; F.D. Marques
As the desire for more flexible aircraft structures increases, so does the need to incorporate the intrinsic nonlinearities in their aeroelastic analyses. In that manner, it becomes essential to fully characterize the aeroelastic behavior and to investigate the effects that common external disturbances, such as atmospheric gust turbulence, might induce. In this work, an augmentation of the semi-empirical
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Examination and comparison of different methods to model closed loop kinematic chains using Lagrangian formulation with cut joint, clearance joint constraint and elastic joint approaches Mech. Mach. Theory (IF 3.312) Pub Date : 2021-02-27 Filipe Marques; Ivo Roupa; Miguel T. Silva; Paulo Flores; Hamid M. Lankarani
This work aims at presenting, in a comprehensive manner, several approaches to model and simulate closed loop topologies using the classical Lagrangian formulation. One of the great advantages of the Lagrangian approach is its simplicity and easiness of obtaining the equations of motion. However, a critical aspect arises when the mechanical systems include closed loop topologies, since the process
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Upright and grand piano actions dynamic performances assessments using a multibody approach Mech. Mach. Theory (IF 3.312) Pub Date : 2021-02-28 Sébastien Timmermans; Anne-Emmanuelle Ceulemans; Paul Fisette
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Design and analysis of Lamina Emergent Joint (LEJ) based on origami technology and mortise-tenon structure Mech. Mach. Theory (IF 3.312) Pub Date : 2021-02-28 Lifang Qiu; Yue Yu; Yuansong Liu
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Numerical Investigation and Design of Reinforced Concrete Shear Wall Equipped with Tuned Liquid Multiple Columns Dampers Shock Vib. (IF 1.298) Pub Date : 2021-02-28 Zhe Wang; Liang Cao; Filippo Ubertini; Simon Laflamme
The tuned liquid multiple column damper (TLMCD) is a variation of the tuned liquid column damper (TLCD) that includes multiple vertical columns. A new damping system that embeds TLMCDs within reinforced concrete shear wall systems, termed tuned liquid wall damper (TLWD), is proposed, augmenting the traditional structural component with energy dissipation capabilities. The objective of this study is
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The Elliptic Harmonic Balance Method for the Performance Analysis of a Two-Stage Vibration Isolation System with Geometric Nonlinearity Shock Vib. (IF 1.298) Pub Date : 2021-02-28 Weilei Wu; Bin Tang
This study develops a modified elliptic harmonic balance method (EHBM) and uses it to solve the force and displacement transmissibility of a two-stage geometrically nonlinear vibration isolation system. Geometric damping and stiffness nonlinearities are incorporated in both the upper and lower stages of the isolator. After using the relative displacement of the nonlinear isolator, we can numerically
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Transmitting Characteristics of Seismic Motion in Super-Deep Overburden Layer Ground Shock Vib. (IF 1.298) Pub Date : 2021-02-28 Long Wang; Zheng-quan Yang; Jian-ming Zhao; Xiao-sheng Liu; Yan-feng Wen
Dynamic response characteristics and antiseismic performance of the structures which were constructed on the super-deep overburden layer are affected obviously by the seismic motion characteristics of the super-deep overburden layer foundation. In this paper, the seismic motion characteristics of horizontally stratified super-deep overburdenIn this paper, the seismic motion characteristics of horizontally
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Experimental and Constitutive Model Study on Dynamic Mechanical Behavior of Metal Rubber under High-Speed Impact Loading Shock Vib. (IF 1.298) Pub Date : 2021-02-28 Youchun Zou; Chao Xiong; Junhui Yin; Kaibo Cui; Xiujie Zhu; Huiyong Deng; Shijun Song
The development of lightweight, impact-resistant, and high energy-consuming materials is of great significance for improving the defense capabilities of military equipment. As a new type of damping material, metal rubber has demonstrated great potential for application in the field of impact protection. In this paper, the dynamic mechanical response of metal rubber under a high strain rate is studied
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Study on Instability Mechanism of Extraction Structure under Undercut Space Based on Thin Plate Theory in Block Caving Method Shock Vib. (IF 1.298) Pub Date : 2021-02-28 Zhi-Yuan Xia; Zhuo-Ying Tan
The instability of extraction structure under the undercut space in the block caving stope presents specific characteristics: rib spalling and floor heave in ore-loading roadway and collapse of major apexes. In order to study the stress and displacement evolution law of extraction structure under undercut space and reveal the instability mechanism of extraction structure, the numerical simulation model
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Fault Diagnosis of Rolling Bearing Based on Modified Deep Metric Learning Method Shock Vib. (IF 1.298) Pub Date : 2021-02-27 Zengbing Xu; Xiaojuan Li; Hui Lin; Zhigang Wang; Tao Peng
A novel fault diagnosis method of rolling bearing based on deep metric learning and Yu norm is proposed in this paper, which is called a deep metric learning method based on Yu norm (DMN-Yu). In order to solve the misclassification caused by the traditional deep metric learning based on distance metric function, a similarity criterion based on Yu norm is introduced into the traditional deep metric
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Failure Mechanism and Control of Lower Retracement Channel in Close-Distance Double-Thick Coal Seams Shock Vib. (IF 1.298) Pub Date : 2021-02-27 Fulian He; Kai Lv; Xiaobin Li; Binbin Qin; Liang Li
Under the condition of close-distance double-thick coal seams’ mining, the serious strata behavior occurred in the lower retracement channel, which is affected by the double disturbance with upper coal-pillar static load and mining dynamic pressure. Field investigation, laboratory test, and numerical simulation were used to study the failure characteristics and stress distribution of N0381 retracement
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Application of a new semi-analytic method in bending behavior of functionally graded material sandwich beams Mech. Based Des. Struct. Mach. (IF 2.286) Pub Date : 2021-02-27 Jun Liu; Congkuan Hao; Wenbin Ye; Quansheng Zang
Abstract In this article, the bending properties of functionally graded material (FGM) sandwich beams are analyzed by using the scaled boundary finite element method (SBFEM) for the first time. The model of FGM sandwhich beams is realized by using high order spectral elements, and only the axial dimension of the beam needs to be discretized. The analytical formula along the thickness direction can
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Role of aging temperature on thermomechanical fatigue lifetime of solder joints in electronic systems Soldering Surf. Mount Technol. (IF 2.164) Pub Date : 2021-03-01 Waluyo Adi Siswanto; Kirill Borodin; Zaid Hamid Mahmoud; A. Surendar; Sami Sajjadifar; Galiya Abdilova; Jun Chang
Purpose The purpose of this study is to investigate the effect of aging temperature on the barrel-type solder joint lifetime of electronic devices and to include these effects in the modified prediction model. Design/methodology/approach Several accelerated shear stress tests under different stress amplitudes and aging temperatures were performed. Findings It was found that by aging temperature increasing
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Observer-based adaptive sliding mode control for steer-by-wire systems with event-triggered communication J. Braz. Soc. Mech. Sci. Eng. (IF 1.755) Pub Date : 2021-02-28 Bingxin Ma, Yongfu Wang
This paper proposes an event-triggered adaptive sliding mode control for the steer-by-wire (SbW) system subject to unavailable state, time-varying disturbance, and limited communication resources. Firstly, an adaptive state observer is proposed to estimate the unmeasured state of the SbW system. The uncertain nonlinearity and the time-varying can be estimated by the adaptive fuzzy logic system and
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Numerical studies of laminar flow over two tandem elliptical cylinders using Ramanujan approximation J. Braz. Soc. Mech. Sci. Eng. (IF 1.755) Pub Date : 2021-02-27 Javad Farrokhi Derakhshandeh, Nima Gharib
This paper studies a laminar flow over tandem elliptical cylinders at Re = 200. While the aspect ratio (AR) of the upstream cylinder varies from AR = \(a_{1}\)/\(b_{1}\) = 0.25 to 2.00, the aspect ratio of the downstream cylinder is kept constant at AR = 1.00 (e.g., \(a_{2}\)/\(b_{2}\) = 1). This range of AR covers the most important practical cross sections of elliptical cylinders, including normal
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Early bolt looseness state identification via generalized variational mode decomposition and similarity index J. Mech. Sci. Tech. (IF 1.345) Pub Date : 2021-02-27 Yanfei Guo, Zhousuo Zhang, Wenzhan Yang, Jianbin Cao, Teng Gong
A novel method for early looseness state identification of bolted joint beams is proposed in this paper based on generalized variational mode decomposition (GVMD) and a similarity index. In the proposed method vibration signals are decomposed by GVMD, which has the property of the multiscale and fixed-frequency decomposition. To effectively extract the desired modes, the frequency band allocation is
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Theoretical study on performance comparison of various solar collectors using binary nanofluids J. Mech. Sci. Tech. (IF 1.345) Pub Date : 2021-02-27 Minjung Lee, Yunchan Shin, Honghyun Cho
The performances of three types of solar collectors using various nanofluids are theoretically investigated; further, by varying the concentration of binary nanofluids comprising of two highly efficient nanofluids, the performances of the solar collectors are analytically examined. The results obtained demonstrate that MWCNT, CuO, and Fe3O4 nanofluids show a higher efficiency compared with other nanofluids
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A study on the flow characteristics of butterfly valve with baffles J. Mech. Sci. Tech. (IF 1.345) Pub Date : 2021-02-27 Seung-Jun Oh, Jeong-Hwan Yoon, Si-Pom Kim
In the industry, globe valves, which are commonly used to precise control the flow rate along with opening and closing flow in pipes, are technically and economically limited in valve size due to structural instability related to complex internal flow passage. Butterfly valves, on the other hand, have advantages such as low weight and low manufacturing costs, but it is difficult to control the flow
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Sequential approximate optimization on projectile disturbances of the moving tank based on BP neural network J. Mech. Sci. Tech. (IF 1.345) Pub Date : 2021-02-27 Yu Chen, Guolai Yang, Honggen Zhou, Quanzhao Sun
For the firing accuracy problem of the moving tank with different speed and different road level, the modelling and optimization method of the projectile disturbances of the moving tank under the general driving conditions were studied. A high-dimensional multi-objective optimization method for the projectile disturbances of the moving tank considering the different driving conditions was proposed
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Numerical study of mechanical behaviour of tubular structures under dynamic compression J. Mech. Sci. Tech. (IF 1.345) Pub Date : 2021-02-27 Amir Partovi, M. M. Shahzamanian, P. D. Wu
This paper presents a novel point of view for the performance investigation and optimization of energy absorber devices, which is numerically introduced using the finite element method employing corrugated tubes. The numerical results show that structural or material softening leads to an optimal configuration at which the corrugated or circular tube achieves its peak performance. The performance and
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Full-phase optimization of PDC bit cutter layout to reduce lateral force based on zoning method J. Mech. Sci. Tech. (IF 1.345) Pub Date : 2021-02-27 Tong Cao, Kaian Yu, Xuyue Chen, Hongwu Zhu, Rui Zhang
Balancing lateral force is essential to reduce bit vibrations and prolong bit service life. During the process of cutting, the instantaneous cutting situation is governed by the previous blades cutting. This paper introduces a notion called "zoning method" based on the cutting geometry of bit-rock interface, which is dedicated to distinguishing different phases of cutting. Furthermore, a full-phase
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Enhancement of bearing fault detection using an alternative analytic energy operator and sparse Bayesian step-filtering J. Mech. Sci. Tech. (IF 1.345) Pub Date : 2021-02-27 Yan Wang, Lichen Gu, Yuanbo Xu
The bearing fault signal is a kind of weak signal, so it is easy to be submerged by background noise. As such, signature extraction is facing a great challenge; hence, an effective signature extraction method plays an essential role in bearing fault extraction. In this paper, a new method for bearing fault detection based on an alternative analytic energy operator and sparse Bayesian step-filtering
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Binary NCP: a new approach for solving nonlinear complementarity problems J. Mech. Sci. Tech. (IF 1.345) Pub Date : 2021-02-27 Byung Man Kwak, Joon Young Kwak
A general nonlinear complementarity problem (NCP) is formulated as a finite set optimization problem called binary NCP, where design variables are identified by n-bit binary numbers. The binary NCP corresponds to the problem of finding a vertex of an n-dimensional unit cube with zero cost value. Two geometrically intuitive algorithms based on the geometry of the unit cube and another algebraically
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Numerical study on failure behavior of open-hole composite laminates based on LaRC criterion and extended finite element method J. Mech. Sci. Tech. (IF 1.345) Pub Date : 2021-02-27 Decheng Liu, Dongfeng Cao, Haixiao Hu, Yucheng Zhong, Shuxin Li
A new numerical model combining LaRC failure criterion and extended finite element method (XFEM) is created to describe the failure behavior in fiber-reinforced polymer (FRP) composites. In this model, the onset of intralaminar damages are predicted based on the LaRC failure criterion, and the crack propagation and stiffness degradation are described explicitly by the XFEM. The user subroutine UDMGINI
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Prediction of creep deformation behavior of KHR45A heater tube steel using nonlinear mixed-effect model J. Mech. Sci. Tech. (IF 1.345) Pub Date : 2021-02-27 Gimo Yang, Young Wha Ma, Thi Giang Le, Kee Bong Yoon
A study for predicting the creep deformation behavior of a MERT (mixing element radiant tube) type KHR45A steel is carried out. To this end, a modification of the theta projection model is proposed by incorporating a statistical analysis technique especially with a nonlinear mixed-effect model. The model is applied for predicting the creep deformation behavior of a KHR45A steel. Creep curve data used
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Jumping motion planning for biped robot based on hip and knee joints coordination control J. Mech. Sci. Tech. (IF 1.345) Pub Date : 2021-02-27 Yongming Bian, Jie Shao, Jixiang Yang, Ao Liang
This paper proposes a method of hip and knee joints coordination control planning based on virtual force. Firstly, the kinematic model of biped robot is established according to the physiological structure of human body. Secondly, the kinematics equation is established based on the jumping motion characteristics of the hip and knee joints, and the motion angles and angular velocities of the hip and
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Cobalt ferrite decoration of molybdenum disulfide nanosheets; development of a nanocomposite-mediated hyperthermia method J. Mech. Sci. Tech. (IF 1.345) Pub Date : 2021-02-27 Mohammadhossein Shahsavari Alavijeh, Adel Maghsoudpour, Morteza Khayat, Iman Rad, Shadie Hatamie
The aims were to characterize MoS2/CoFe2O4 nanocomposite and investigate its thermal therapy efficiency on cancerous (MCF-7) and normal (MCF-10A) human breast cells. Magnetic nanocomposites (MNCs) characterized by scanning/transmission electron microscopy (SEM/TEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and vibrating sample magnetometer (VSM) techniques. TEM and SEM
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Nonlinear bending analysis of magnetoelectroelastic rectangular plates using higher order shear deformation theory J. Mech. Sci. Tech. (IF 1.345) Pub Date : 2021-02-27 Yu-fang Zheng, Liang-liang Xu, Chang-ping Chen
Nonlinear bending analysis was performed of magnetoelectroelastic (MEE) composite plates under a mechanical and magnetoelectric (ME) load by using von Karman’s nonlinear geometric equation and the higher order shear deformation theory (HSDT). Nonlinear higher order partial differential equations for MEE plates were derived by using Hamiltonian equilibrium equation. The MEE plate is considered to have
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Top-down nanofabrication approaches toward single-digit-nanometer scale structures J. Mech. Sci. Tech. (IF 1.345) Pub Date : 2021-02-27 Dong Kyo Oh, Heonyeong Jeong, Joohoon Kim, Yeseul Kim, Inki Kim, Jong G. Ok, Junsuk Rho
Sub-10 nm nanostructures have received broad interest for their intriguing nano-optical phenomena, such as extreme field localization and enhancement, quantum tunneling effect, and strong coupling. The range of cutting-edge applications based on single-digit-nanometer scale structures has expanded with the development of nanofabrication technologies. However, challenges still remain in overcoming fabrication
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Experimental study on the gas jet characteristics of a diesel-piloted direct-injection natural gas engine J. Mech. Sci. Tech. (IF 1.345) Pub Date : 2021-02-27 Peng Jiang, Xu Liu, Lixuan Cao, Qian Wang, Zhixia He
The natural gas (NG) jet characteristics of NG/diesel dual-fuel injection under different NG injection pressures and dual-fuel injection intervals were studied in a constant volume chamber. The schlieren images showed that the development of NG jet was restricted in both axial and radial directions by diesel spray under dual-fuel injection conditions. Consistently, dual-fuel injection reduced NG jet
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Assessment of InfiniteFocus system measurement errors in testing the accuracy of crown and tooth body model J. Mech. Sci. Tech. (IF 1.345) Pub Date : 2021-02-27 Anna Bazan, Paweł Turek, Łukasz Przeszłowski
The paper aims to analyze the InfiniteFocus system for the capability to measure macrogeometry of tooth models manufactured using two material extrusion techniques, i.e. MEM and FFF, and analyze the accuracy of manufacturing the said models. To achieve the goals it was needed to carry out two studies. The first one focused on estimating the measurement error of the microscope in the course of digitalizing
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A multi-objective airfoil shape optimization study using mesh morphing and response surface method J. Mech. Sci. Tech. (IF 1.345) Pub Date : 2021-02-27 Hariharan Kallath, Jun Seok Lee, Foster Kwame Kholi, Man Yeong Ha, June Kee Min
Here, a distinct procedure was adopted to optimize the shape of the NACA 0012 airfoil profile for Reynolds number, Mach number, and angle of attack equal to 2e6, 0.15, and 10.24 deg, respectively. The airfoil shape was appropriately parameterized, and mesh morphing tools were used to bypass the remeshing process. Computational fluid dynamic (CFD) simulations were carried out for all combinations of
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Effect of the worn status of wheel/rail profiles on wheel wear over curved tracks J. Mech. Sci. Tech. (IF 1.345) Pub Date : 2021-02-27 Jie Kou, Jimin Zhang, Hechao Zhou, Chengping Wang, Lixia Sun
The worn status of wheel/rail profiles could change the wheel-rail contact and influence the wear rates of the wheel and rail. Worn wheel profiles of a Chinese intercity train and the worn rail profile of curved tracks were taken into account in this work. According to the dynamics model of the vehicle, teh wheel-rail three-dimensional steady-state rolling contact model, and the Archard wear model
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Structure integrity evaluation of gas protective wall for new construction method using strength test and numerical analysis J. Mech. Sci. Tech. (IF 1.345) Pub Date : 2021-02-27 Doo Guen Song, Seung Ho Jung, Eui Soo Kim
Gas protective walls are safety elements that can withstand the pressure of fires or explosions caused by gas leaks, thus preventing the spread of explosion damage to other facilities or operators. However, in the new construction or expansion of gas facility rooms in existing buildings, the barrier must often be built even if it does not satisfy the legal standards regarding the accepted construction
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Damaged and failure characterization of 7075-T6 Al alloy based on GISSMO model J. Mech. Sci. Tech. (IF 1.345) Pub Date : 2021-02-27 Zhiqiang Zhang, Yuejie Cui, Ge Yu
Failure simulation of 7075-T6 Al alloy is very important due to its relatively low ductility compared to conventional steel. A hybrid numerical-experimental method was developed to determine plastic strains at fracture as a function of triaxiality. The uniaxial tension tests were performed by using the specimens including pure shear, 45° shear, smooth, R5 notch and R15 notch. The fracture locus was
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Detecting Soccer Balls with Reduced Neural Networks J. Intell. Robot. Syst. (IF 2.259) Pub Date : 2021-02-27 Douglas De Rizzo Meneghetti, Thiago Pedro Donadon Homem, Jonas Henrique Renolfi de Oliveira, Isaac Jesus da Silva, Danilo Hernani Perico, Reinaldo Augusto da Costa Bianchi
Object detection techniques that achieve state-of-the-art detection accuracy employ convolutional neural networks, implemented to have lower latency in graphics processing units. Some hardware systems, such as mobile robots, operate under constrained hardware situations, but still benefit from object detection capabilities. Multiple network models have been proposed, achieving comparable accuracy with
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A Novel Speech to Mouth Articulation System for Realistic Humanoid Robots J. Intell. Robot. Syst. (IF 2.259) Pub Date : 2021-02-27 Carl Strathearn, Eunice Minhua Ma
A significant ongoing issue in realistic humanoid robotics (RHRs) is inaccurate speech to mouth synchronisation. Even the most advanced robotic systems cannot authentically emulate the natural movements of the human jaw, lips and tongue during verbal communication. These visual and functional irregularities have the potential to propagate the Uncanny Valley Effect (UVE) and reduce speech understanding
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Multi-scale evolution mechanism and knowledge construction of a digital twin mimic model Robot. Comput.-Integr. Manuf. (IF 5.057) Pub Date : 2021-02-27 Shimin Liu; Yuqian Lu; Jie Li; Dengqiang Song; Xuemin Sun; Jinsong Bao
Metal products are susceptible to factors such as cutting force, clamping force and heat in the machining process, resulting in product quality problems, such as geometric deformation and surface defects. The real-time observation and control of product quality are integral to optimizing machining process. Digital twin technologies can be used to monitor and control the quality of products via multi-scale
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A visual path-following learning approach for industrial robots using DRL Robot. Comput.-Integr. Manuf. (IF 5.057) Pub Date : 2021-02-27 Alan Maldonado-Ramirez; Reyes Rios-Cabrera; Ismael Lopez-Juarez
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Brownian motion of magnetonanofluid flow in an undulated partially heated enclosure Int. J. Mech. Sci. (IF 4.631) Pub Date : 2021-02-14 Krishno D. Goswami; Anirban Chattopadhyay; Swapan K. Pandit; Mikhail A. Sheremet
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