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Fluid–structure interaction analysis of hemodynamics in different degrees of stenoses considering microcirculation function Adv. Mech. Eng. (IF 1.161) Pub Date : 2021-01-26 Fan He; Lu Hua; Tingting Guo
In developed countries, stenosis is the main cause of death. To investigate hemodynamics within different degrees of stenoses, a stenosis model incorporating fluid–structure interaction and microcirculation function is used in this paper. Microcirculation is treated as a seepage outlet boundary condition. Compliant arterial wall is considered. Numerical simulation based on fluid–structure interaction
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Temperature rise characteristics for angular-contact ball bearings with oil-air lubrication based on fluid-solid conjugate heat transfer Adv. Mech. Eng. (IF 1.161) Pub Date : 2021-01-26 Miaomiao Li; Yu Wang; Weifang Chen; Rupeng Zhu
At present, the thermal analysis of oil-air-lubricated angular-contact ball bearings uses empirical heat transfer coefficients to calculate heat transfer. This approach presents problems such as simulating the actual lubrication flow field and ignoring the internal heat conduction in the bearing ring. This paper proposes a CFD steady-state analysis model of oil-air-lubricated angular-contact ball bearings
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Improvement of noise reduction performance in bellows using multilayer perforated panels Adv. Mech. Eng. (IF 1.161) Pub Date : 2021-01-22 Hee-Min Noh
When the speed of a railway vehicle increases, the level of noise inside the vehicle inevitably increases as well, which is a major cause of discomfort to passengers. The most effective method is to improve the overall noise reduction performance of a vehicle. In particular, the gangway of the railway vehicle is made of silicone rubber; therefore, its noise reduction performance is inferior to that
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Detection and localization of multiple small damages in beam Adv. Mech. Eng. (IF 1.161) Pub Date : 2021-01-18 Ayisha Nayyar; Ummul Baneen; Syed Abbas Zilqurnain Naqvi; Muhammad Ahsan
Localizing small damages often requires sensors be mounted in the proximity of damage to obtain high Signal-to-Noise Ratio in system frequency response to input excitation. The proximity requirement limits the applicability of existing schemes for low-severity damage detection as an estimate of damage location may not be known a priori. In this work it is shown that spatial locality is not a fundamental
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Free vibration for a micro resonant pressure sensor with cross-type resonator Adv. Mech. Eng. (IF 1.161) Pub Date : 2021-01-14 Guang Han; Xiaorui Fu; Lizhong Xu
In this paper, a cross resonator pressure sensor is proposed to improve the detection accuracy of capacitor-detecting sensor. Considering electrostatic force and molecular force, the multi-field coupled dynamic equation of the sensor is established. By solving the dynamic equation, the equations for the mode function and the natural frequencies of the resonator are obtained. Using these equations,
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Implementation of vibration and stability evaluation criteria for rotating machineries equipped with active magnetic bearings Adv. Mech. Eng. (IF 1.161) Pub Date : 2021-01-14 Kexiang Li; Cong Peng; Zhiquan Deng; Zhongming Zhang; Kaiwen Cai
Imbalance vibration is the main factor affecting the stability of rotating machineries equipped with active magnetic bearings (AMB). Accordingly, for safe and reliable operation, ISO 14839 standard sets out guidelines for measuring and evaluating the vibration and stability. However, technical approaches to realize fulfillment of the evaluation criteria have never been studied in theory. This paper
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Testing of proposed design of stove-powered thermoelectric generator using natural and forced air cooling Adv. Mech. Eng. (IF 1.161) Pub Date : 2021-01-14 Zuzana Murčinková; Marek Kosturák; Jozef Ferenc
This paper presents the prototype design, implementation and testing of a thermoelectric generator unusually applied to the fireplace stoves. The tested low-cost thermoelectric generator can be used as an alternative low source of electricity in areas with limited access to public electricity networks. Moreover, inclusion of a thermoelectric generator in the fireplace stove structure is novelty and
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Tool diameter optimization in S-shaped test piece machining Adv. Mech. Eng. (IF 1.161) Pub Date : 2021-01-14 Fu Meng; Guan Liwen; Wang Liping; Mo Jiao; Zhao Xiao
S-shaped test piece is used to assess the performance of five-axis numerical control machine tools. Compared to traditional test method and test pieces, it performs better and was agreed to be included in the draft international standard at the 79th ISO/TC39SC2 meeting. However, the lack of theoretical research is the barrier to apply for standard and to be widely used. Therefore, this paper aims to
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Proposal of a stage-by-stage design method and its application on a multi-stage multiphase pump based on numerical simulations Adv. Mech. Eng. (IF 1.161) Pub Date : 2021-01-13 Yi Shi; Hongwu Zhu
Rotodynamic multiphase pumps are usually equipped with many compression units to provide sufficient boosting pressure for the transportation of production fluid in gas oil field. It is a challenge to maintain pump performance while flow parameters in each stage vary due to the compressibility of gas-liquid phase. In this article, a stage-by-stage design method is proposed to improve the boosting capability
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Forced convective heat transfer and thermal efficiency assessment in square channel equipped with 10° wavy thin rib Adv. Mech. Eng. (IF 1.161) Pub Date : 2020-12-31 Amnart Boonloi; Withada Jedsadaratanachai
Forced convective heat transfer and thermo-hydraulic efficiency in the heat exchanger square channel (HESC) inserted with 10° wavy thin rib (WTR) are reported numerically. The effects of rib height, pitch distance and flow velocity on flow and heat transfer profiles are considered. The rib height to the channel height; e/H or HR, is varied in the range 0.05–0.30, while the rib pitch to the channel
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The decoupled vector-control of PMSM based on nonlinear multi-input multi-output decoupling ADRC Adv. Mech. Eng. (IF 1.161) Pub Date : 2020-12-29 Yihua Liu; Jiayi Wen; Dacheng Xu; Zhijian Huang; Hong Zhou
The Permanent Magnet Synchronous Motor (PMSM) is widely used in many fields. Aiming at nonlinearity, strong coupling and uncertainty of the PMSM, this paper proposes a nonlinear multi-input multi-output (MIMO) decoupling PMSM algorithm based on Active Disturbance Rejection Control (ADRC). A Lower-Upper matrix factorization approach is introduced to solve a general inverse of the measured time-varying
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Vibration reduction and stability analysis of damping rings on nonlinear free-free beam Adv. Mech. Eng. (IF 1.161) Pub Date : 2020-12-29 Yi-Ren Wang; Yun-Shuo Chang; Nguyen Cong Ha
Two damping rings (DRs) are added on a nonlinear free-free elastic beam to reduce vibrations. This elastic beam with free-free boundary conditions can be used to simulate the high speed aircraft fuselage vibrations. Both isotropic beam and compound beam with double-section are investigated. The beam is subjected to a distributed load with the harmonic wind force. The method of multiple scales ((MOMS)
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Simulation and experimental study of a new structural rubber seal for the roller-cone bit under high temperature Adv. Mech. Eng. (IF 1.161) Pub Date : 2020-12-29 Lin Chen; Wei Lin; Yiwei Han; Zhijiu Ai; Yuchun Kuang; Chunlei Yang
Seal element is an important component of roller-cone bit. In order to improve the sealing performance and service life of roller-cone bit under high temperature, a new seal structure with multi-segment arcs is designed and the structural parameters of this sealing ring are optimized by response surface method and finite element method. Firstly, the hydrogenated nitrile-butadiene rubber is used to
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Measurement and simulation of fluid flow field in the pipe of magnetic capsule robot Adv. Mech. Eng. (IF 1.161) Pub Date : 2020-12-29 Tang Puhua; Liang Liang; Xiang Yanghui
Through the combination of experimental measurement and CFD (computational fluid dynamics) method, the fluid flow characteristics in the pipe of magnetic capsule robot for intestinal tract are studied. The PIV (particle imaging velocimetry) system is used to measure the fluid flow field around the magnetic-controlled capsule robot under certain translational and rotational speeds, and the rich flow
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Scrutiny of entropy optimized tangent hyperbolic fluid (non-Newtonian) through perturbation and numerical methods between heated plates Adv. Mech. Eng. (IF 1.161) Pub Date : 2020-12-28 M Ijaz Khan; Mubbashar Nazeer; Nasir Shehzad; Adila Saleem; Fayyaz Ahmad
Objective: Many methods have been used to maximize the capacity of heat transport. A constant pressure gradient or the motion of the wall can be used to increase the heat transfer rate and minimize entropy. The main goal of our investigation is to develop a mathematical model of a non-Newtonian fluid bounded within a parallel geometry. Minimization of entropy generation within the system also forms
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High accuracy robust attitude tracking control application on quadrotor UAV with the prescribed performance Adv. Mech. Eng. (IF 1.161) Pub Date : 2020-12-28 Jingxin Dou; Qiansheng Tang; Bangchun Wen
In this paper, a high accuracy attitude tracking control is presented for a quadrotor unmanned aerial vehicle (UAV) under the model uncertainties and external unpredictable disturbances by using a robust feedback control method. First, the cascade attitude dynamics of a quadrotor UAV is derived with the lumped disturbances. Then, a backstepping adaptive modified robust integral of the sign of the error
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Temperature stratification using an air-cooled heat pump system with a mixing valve Adv. Mech. Eng. (IF 1.161) Pub Date : 2020-12-28 Wang Kook Han; Jin Man Kim; Tae Hun Lim; Hae Eun Song; Young Chull Ahn
The main factor determining the performance of a thermal storage method is the temperature stratification in the storage tank. At the ideal stratification, the energy efficiency of the storage tank is extremely high. However, when the heat pump is applied, the stratification is disrupted by heat exchange between the layers of the heat medium, and consequent convection in the tank. Therefore, this study
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Kinematics analysis and experimental study on three-dimensional space bending flexible pneumatic arm Adv. Mech. Eng. (IF 1.161) Pub Date : 2020-12-28 Liu Hongbo; Geng Dexu; Li Junye
A type of three-dimensional space bending flexible pneumatic arm employing axial elongation pneumatic artificial muscles was proposed. It was mainly composed of six pneumatic artificial muscles symmetrically distributed in parallel, and six artificial muscles were fixed 60° each other in space. The elastic skeleton was added among the arm to improve its rigidity and stability. Especially, the driving
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Integrated scheduling algorithm based on the priority constraint table for complex products with tree structure Adv. Mech. Eng. (IF 1.161) Pub Date : 2020-12-28 Yilong Gao; Zhiqiang Xie; Xinyang Liu; Wei Zhou; Xu Yu
Aiming at the existing intelligent optimization algorithms for solving the integrated scheduling problem of complex products with tree structure, there are problems of missing optimal solutions when designing encoding methods or generating infeasible offspring while designing evolutionary operators, an integrated scheduling algorithm based on the priority constraint table is proposed in this paper
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Investigation of optimal lamination condition of CFRTP by compression molding method and a comparison of mechanical properties with CFRTS Adv. Mech. Eng. (IF 1.161) Pub Date : 2020-12-28 Dae Won Kim; Chul Kyu Jin; Min Sik Lee; Chung Gil Kang; Hyung Yoon Seo
The variables of die temperature, pressure, time, lamination method, and forming count are applied to fabricate thermosoftening CFRP (CFRTP) with compression molding method. The mechanical properties of CFRTP are compared with those of thermosetting CFRP (CFRTS). The first lamination method is that one hotmelt is inserted into carbon fiber (five carbon fibers and four hotmelts). The optimal lamination
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Dust removal characteristics of a supersonic antigravity siphon atomization nozzle Adv. Mech. Eng. (IF 1.161) Pub Date : 2020-12-24 Tian Zhang; Deji Jing; Shaocheng Ge; Jiren Wang; Xi Chen; ShuaiShuai Ren
To improve the trapping efficiency of respiratory dust by aerodynamic atomization, reduce the energy consumption and the requirements for the working conditions of nozzles and maintain the health and safety of workers, a comparative experiment evaluating aerodynamic atomization dust removal characteristics was conducted with a self-developed supersonic siphon atomization nozzle, which utilizes a Laval
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A discretization method for predicting the equivalent elastic parameters of the graded lattice structure Adv. Mech. Eng. (IF 1.161) Pub Date : 2020-12-23 Cun Zhao; Guoxi Li; Meng Zhang; Weipeng Luo
In recent years, cellular materials have been widely studied and applied in aerospace and other fields due to the advantages of lightweight and multi-function. However, it is difficult to predict the equivalent elastic properties of the graded lattice structure and other non-uniform cellular materials because of the complex configuration and non-uniformity. A new discretization method for predicting
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Analytical model of high-frequency energy flow response for a beam with free layer damping Adv. Mech. Eng. (IF 1.161) Pub Date : 2020-12-23 Xiaoyan Teng; Nan Liu; Xudong Jiang
Energy flow analysis (EFA) is developed to predict the vibrational energy density of beam structures with both full free layer damping (FFLD) and partial free layer damping (PFLD) treatments in the high frequency range. Both equivalent flexural stiffness and structural damping loss factor of a beam with free layer damping are obtained using the equivalent complex stiffness method. Then the energy density
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Influence of charge density and oxygen concentration on combustion paths, thermal efficiency and emissions in a heavy-duty diesel engine Adv. Mech. Eng. (IF 1.161) Pub Date : 2020-12-22 Yingying Lu; Yiqiang Pei; Binyang Wu; Yize Liu
Experiments and simulations were conducted to study effects of charge density, temperature, and oxygen concentration on the mixing-controlled engine combustion pathway in heavy-duty diesel engines. Due to the inherent heterogeneity of diesel combustion in high-load operations, the rich and lean mixtures are simultaneous present. The mass and accompanying heat transfers were found to be decisive in
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Interference analysis and simulation of abrasive belt grinding and polishing of blisk Adv. Mech. Eng. (IF 1.161) Pub Date : 2020-12-22 Lei Zhang; Chen Ding; Cheng Fan; Qiang Yuan; Qian Wang; Kejun Wang
Blisk is a difficult processing part with complex structure. The polishing quality and accuracy of the blade surface will significantly affect its performance and life. A new abrasive belt system is developed to grind and polish the blade on the blisk. In view of the problem that the abrasive belt is easy to interfere with the adjacent blades in the grinding and polishing process, an algorithm for
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Effects of multiple injections on combustion and emissions in a heavy-duty diesel engine at high load and low speed Adv. Mech. Eng. (IF 1.161) Pub Date : 2020-12-22 Yingying Lu; Yize Liu
Advanced multiple injection strategies have been suggested for compression ignition engines in order to meet the increasingly stringent emission regulations. Experiments and simulations were used to study effects of the main-injection mode (times), the post-injection proportion, and timing on combustion and emissions in a heavy-duty diesel engine at high load and constant low speed. The results reveal
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Research on aerodynamic characteristics of two-stage axial micro air turbine spindle for small parts machining Adv. Mech. Eng. (IF 1.161) Pub Date : 2020-12-21 Liu Jiang; Guo Zhiping; Miao Shujing; He Xiangxin; Zhu Xinyu
In order to meet the requirements of output torque, efficiency and compact shape of micro-spindles for small parts machining, a two-stage axial micro air turbine spindle with an axial inlet and outlet is proposed. Based on the k-ω turbulence model of SST, the flow field and operation characteristics of the two-stage axial micro air turbine spindle were studied using computational fluid dynamics (CFD)
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Identifying optimal features for cutting tool condition monitoring using recurrent neural networks Adv. Mech. Eng. (IF 1.161) Pub Date : 2020-12-21 Wennian Yu; Chris Mechefske; Il Yong Kim
Identification of optimal features is necessary for the decision-making models such as the artificial neural network to achieve effective and robust on-line monitoring of cutting tool condition. Most feature selection strategies proposed in the literature are for pattern recognition or classification problems, and not suitable for prognostic problems. This paper applies three parameter suitability
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Influence of hinge length and distribution number on the camber and cornering properties of a non-pneumatic tire Adv. Mech. Eng. (IF 1.161) Pub Date : 2020-12-21 Xianbin Du; Youqun Zhao; Yijiang Ma; Hongxun Fu
The camber and cornering properties of the tire directly affect the handling stability of vehicles, especially in emergencies such as high-speed cornering and obstacle avoidance. The structural and load-bearing mode of non-pneumatic mechanical elastic (ME) wheel determine that the mechanical properties of ME wheel will change when different combinations of hinge length and distribution number are adopted
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Rapid prototyping method for 3D PDMS microfluidic devices using a red femtosecond laser Adv. Mech. Eng. (IF 1.161) Pub Date : 2020-12-17 Mozafar Saadat; Marie Taylor; Arran Hughes; Amir M Hajiyavand
A rapid prototyping technique is demonstrated which uses a red femtosecond laser to produce a metallic mould which is then directly used for the replica moulding of PDMS. The manufacturing process can be completed in less than 6 h making it a viable technique for testing new designs quickly. The technique is validated by creating a microfluidic device with channels of height and depth of 300 µm, with
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Novel electric power steering control strategies of commercial vehicles considering adhesion coefficient Adv. Mech. Eng. (IF 1.161) Pub Date : 2020-12-17 Li Yaohua; Fan Jikang; He Jie; Nan Youfei; Feng Qianlong
The steering resistance torque of commercial vehicles on low adhesion pavement is greatly reduced. Therefore, while driving on low adhesion pavement, the use of traditional EPS control strategies without considering adhesion coefficient will lead to driver’s road feeling being reduced or even lost, endangering driving safety. In this paper, the relationship between adhesion coefficient and steering
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Develop the socially human-aware navigation system using dynamic window approach and optimize cost function for autonomous medical robot Adv. Mech. Eng. (IF 1.161) Pub Date : 2020-12-16 Ha Quang Thinh Ngo; Van Nghia Le; Vu Dao Nguyen Thien; Thanh Phuong Nguyen; Hung Nguyen
In previous works, the perceived safety and comfort are currently not the principal objectives of all industries, especially robotics system. It might lead not to take psychological safety into consideration of adjusting robot behavior, hence, the human-robot interaction lacks of ease and naturalness. In this paper, a novel framework of human’s zones to ensure safety for social interactions in human-machine
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Hybridization of time synchronous averaging, singular value decomposition, and adaptive neuro fuzzy inference system for multi-fault bearing diagnosis Adv. Mech. Eng. (IF 1.161) Pub Date : 2020-12-16 Walid Touzout; Djamel Benazzouz; Fawzi Gougam; Adel Afia; Chemseddine Rahmoune
Bearing diagnosis has attracted considerable research interest; thus, researchers have developed several signal processing techniques using vibration analysis to monitor the rotating machinery’s conditions. In practical engineering, features extraction with most relevant information from experimental vibration signals under variable operation conditions is still regarded as the most critical concern
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Adaptive pseudo-rigid-body model for generalized cross-spring pivots under combined loads Adv. Mech. Eng. (IF 1.161) Pub Date : 2020-12-15 Zhongzhou Wang; Haixuan Sun; Bidou Wang; Peng Wang
Generalized cross-spring pivots (CSPs) are widely used as revolute joints in precision machinery. However, pseudo-rigid-body (PRB) models cannot capture the parasitic motions of a generalized CSP exactly under combined loads; moreover, the characteristic parameters used in PRB methods must be recomputed using optimization techniques. In this study, we develop two simple and accurate PRB models for
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Rolling bearing fault diagnosis based on probabilistic mixture model and semi-supervised ladder network Adv. Mech. Eng. (IF 1.161) Pub Date : 2020-12-13 Xu Ding; Xuesong Lu; Dong Wang; Qingzhou Lv; Hua Zhai
Fault diagnosis of rolling bearings is of great significance to ensure the production efficiency of rotating machinery as well as personal safety. In recent years, machine learning has shown great potential in signal feature extraction and pattern recognition, and it is superior to traditional fault diagnosis methods in dealing with big data. However, most of the current intelligent diagnostic methods
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Diesel engine performance, emissions and combustion characteristics of castor oil blends using pyrolysis Adv. Mech. Eng. (IF 1.161) Pub Date : 2020-12-10 Youssef A. Attai; Osayed S. Abu-Elyazeed; Mohamed R. ElBeshbeshy; Mohamed A. Ramadan; Mohamed S. Gad
Castor biodiesel (CBD) was manufactured by slow pyrolysis of oil from highly yielded seeds with anhydrous sodium hydroxide catalyst. An experimental study of engine’s performance, emissions and combustion characteristics using biodiesel blended with gas oil in volumetric ratios of 0, 10, 25, 50, 75, and 100% at different loads was performed. Increase of CBD percentage in the blend led to a reduction
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Research on bolt pre-tightening and relaxation mechanism under transverse load Adv. Mech. Eng. (IF 1.161) Pub Date : 2020-12-10 Dawei Gao; Jiacheng Gong; Zhongling Tian; Tengfei Zheng
In order to predict the bolt’s stress distribution under the pre-tightening state and the loosening process under the transverse load, a 3D model considering the bolt thread structure was established by finite element method (FEM). In this study, the looseness effect of transverse load amplitude, the friction coefficient of the bolt head load bearing surface and the thread contact surface are mainly
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Finite element analysis of T-joint of mechanical connecting channels Adv. Mech. Eng. (IF 1.161) Pub Date : 2020-12-10 Jiawei Wang; Fachao Li; Zibo Chen; Baishu Li; Jue Zhu
This paper studies the force and deformation of the connecting channel in Ningbo rail transit construction, which firstly used the mechanical shield method. Steel-concrete composite structural segments are used in the T-joint of connecting channel. The cutting part of the segments are replaced by the concrete and fiberglass instead of reinforced concrete. Basing on a variety of three-dimensional design
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A feasibility study of implementation of oxy-fuel combustion on a practical diesel engine at the economical oxygen-fuel ratios by computer simulation Adv. Mech. Eng. (IF 1.161) Pub Date : 2020-12-09 Xiang Li; Zhijun Peng; Tahmina Ajmal; Abdel Aitouche; Raouf Mobasheri; Yiqiang Pei; Bo Gao; Matthias Wellers
To help achieve zero carbon emissions from inland waterway vessels, this implementation of oxy-fuel combustion on a practical diesel engine at the economical oxygen-fuel ratios were systematically studied and analysed in this paper. A 1-D simulation was used to explore the effect of various operating parameters for recovering the engine power when the engine is modified to the oxy-fuel combustion from
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Optimal predictive steering control for autonomous runway exits Adv. Mech. Eng. (IF 1.161) Pub Date : 2020-12-09 Zexin Huang; Matthew Best; James Knowles
In this paper, we present a real-time optimal controller, Predictive Steering Control (PSC), to perform high-speed runway exit manoeuvres. PSC is developed based on a time-varying LQR with look-ahead. The aircraft’s ground dynamics are described by a high-fidelity nonlinear model. The proposed controller is compared with an Expert Pilot Model (EPM), which represents a pilot, in several different speed
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Impact of pseudoplaticity and dilatancy of fluid on peristaltic flow and heat transfer: Reiner-Philippoff fluid model Adv. Mech. Eng. (IF 1.161) Pub Date : 2020-12-09 Muhammad Tahir; Adeel Ahmad
The objective of this article is to investigate the impact of pseudoplaticity and dilatancy of fluid on peristaltic flow and heat transfer of non-Newtonian fluid in a non-uniform asymmetric channel. The mathematical-model incorporates the non-linear implicit stress deformation relation using the classical Reiner-Philippoff viscosity model, which is one of the very few non-Newtonian models exhibiting
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Performance research and safety verification of compound structure air spring Adv. Mech. Eng. (IF 1.161) Pub Date : 2020-12-08 Lihang Yin; Wei Xu; Zechao Hu; Yuanchao Zhang; Chuang Li
To further reduce the vertical stiffness of the air spring, appropriately reduce its lateral stiffness to attenuate the transmission of vibration along the lateral and longitudinal directions, a compound structure air spring (CSAS) was designed. It is a laminated structure with a hard elastic layer at the lower end of the original air spring. Prototypes of the air spring and the CSAS were produced
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Local coating of curved rails by using low friction material for squeal noise reduction Adv. Mech. Eng. (IF 1.161) Pub Date : 2020-12-08 Jae Chul Kim; Hee-Min Noh; Yang Soo Yun
Curve squeal noise is one of the most prominent noises among railway noises. High levels of noise are generated when a train passes through curved sections, resulting in several complaints from the residents and vehicle passengers. To mitigate this problem, the squeal noise was attempted to be mitigated by laser cladding the composite material on the head of the rail. First, the effect of the negative
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Evaluation and improvement of tire rolling resistance and grip performance based on test and simulation Adv. Mech. Eng. (IF 1.161) Pub Date : 2020-12-08 Chen Liang; Haowen Li; Hoda Mousavi; Guolin Wang; Kangying Yu
In order to clarify the contradictory mechanism between tire rolling resistance and grip performance, ten (10) 205/55 R16 radial tires with different tread patterns were selected as the research objects. Using VIC-3D non-contact strain measurement system, the pattern deformation in the contact area under vertical load was tested and the relevant deformation parameters of the contact area were extracted
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Measurement of unidirectional pose accuracy and repeatability of the collaborative robot UR5 Adv. Mech. Eng. (IF 1.161) Pub Date : 2020-12-06 Martin Pollák; Marek Kočiško; Dušan Paulišin; Petr Baron
The article describes the measurement of unidirectional pose accuracy and repeatability of a collaborative robot. The objective of the measurements is to investigate and evaluate unidirectional accuracy of the six-axis collaborative robot UR5 of the company Universal Robots. The measurement methodology was based on outlining an imaginary ISO cube placed in the robot’s workspace, in which the robot’s
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A study on the influence of pick geometry on rock cutting based on full-scale cutting test and simulation Adv. Mech. Eng. (IF 1.161) Pub Date : 2020-12-06 Xuefeng Li
In this paper, series of full-scale cutting tests and cutting simulations are carried out to investigate the influence of installation parameter and geometry of the pick on cutting performance. The discrete element method is used to simulate the rock cutting process. A general process to calibrate macro properties of rock including uniaxial compressive strength (UCS), elastic modulus, Poisson’s ratio
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Optimization of the setup position of a workpiece for five-axis machining to reduce machining time Adv. Mech. Eng. (IF 1.161) Pub Date : 2020-12-06 Ching-chih Wei; Wei-chen Lee
Five-axis machining is commonly used for complicated features due to its advantage of rotary movement. However, the rotary movement introduces nonlinear terms in the kinematic transform. The nonlinear terms are related to the distance between the cutter location (CL) data and the intersection of the two rotary axes. This research studied the possible setup positions after the toolpaths have been generated
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Ricochet of steel spheres on sand with varying water content Adv. Mech. Eng. (IF 1.161) Pub Date : 2020-12-06 Yoon Keon Kim; Woo Chun Choi
The explosion of a building generates plenty of debris that flies far away. The flying debris is hazardous because it contains large amounts of kinetic energy. Therefore, determining the safety distance from the debris is essential. However, debris ricochet that collides onto the ground affects the safety distance because the ricochet phenomenon is influenced by the condition of the medium. In this
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A theoretical analysis of temperature rise of hydrogen in high-pressure storage cylinder during fast filling process Adv. Mech. Eng. (IF 1.161) Pub Date : 2020-12-04 Ji-Qiang LI; No-Seuk Myoung; Jeong-Tae Kwon; Seon-Jun Jang; Taeckhong Lee; Yong-Hun Lee
During the fast filing process, thermal stress is generated due to the increase in the pressure and temperature of hydrogen in the hydrogen storage tank. For its safety purpose, it is necessary to predict and control the temperature change in the tank. The aim of this study is quantitative analysis of the final temperature and the mass of the hydrogen in the tank through experimental and theoretical
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Mobility analysis of a typical multi-loop coupled mechanism based on screw theory and its drive layout optimization Adv. Mech. Eng. (IF 1.161) Pub Date : 2020-12-04 Ming Han; Dong Yang; Baojun Shi; Tiejun Li; Jianbin Feng
Improving the load-to-weight ratio of robots is an essential issue in the field of construction robots. In the present study, a method for analyzing the mobility of the typical multi-loop coupled mechanism is proposed, which combines the iterative replacement of generalized kinematic pairs with the screw theory. Then, the driving force/torque, driving power, and total power of actuators are considered
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Erratum to “Potential of using polyethylene as viscosity enhancer of palm oil to use as a lubricating oil” Adv. Mech. Eng. (IF 1.161) Pub Date : 2020-12-04
Pathmasiri TKKS and Perera GIP. Potential of using polyethylene as viscosity enhancer of palm oil to use as a lubricating oil. Advances in Mechanical Engineering 2020; 12: 1-13. DOI: 10.1177/1687814020970745
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Precision degradation prediction of inertial test turntable based on Hidden Markov Model and optimized particle filtering Adv. Mech. Eng. (IF 1.161) Pub Date : 2020-11-30 Liming Li; Xunyi Zhou; Xingqi Zhang; Zhenghu Zhong
In order to solve the problem that there is no effective evaluation method for the precision degradation state of inertial test turntable, a prediction model for the position precision degradation trend of test turntable was proposed based on the Hidden Markov Model (HMM) algorithm and Particle Filter (PF) algorithm. The initial parameter of the PF algorithm was optimized by the Particle Swarm Optimization
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Wave scattering of non-planar trifurcated waveguide by varying the incident through multiple regions Adv. Mech. Eng. (IF 1.161) Pub Date : 2020-11-27 Haleem Afsar; Rab Nawaz; Aasim Ullah Jan
This article elucidates a non-planar trifurcated wave scattering problem by considering incident wave through multiple regions of the underlying waveguide. The scattered field potentials in respective duct regions are obtained via mode-matching technique (MMT) thereby dealing with the non-planar surfaces and step discontinuities positively. The scattering effects are determined by allowing the incident
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Experimental and numerical studies on the influence of inlet guide vanes of centrifugal compressor on the flow field characteristics of inlet chamber Adv. Mech. Eng. (IF 1.161) Pub Date : 2020-11-26 Fenghui Han; Zhe Wang; Yijun Mao; Jiajian Tan; Wenhua Li
Inlet chambers (IC) are the typical upstream component of centrifugal compressors, and inlet guide vanes in the IC have a great impact on its internal flow and aerodynamic loss, which will significantly influence the performance of the downstream compressor stages. In this paper, an experimental study was carried out on the flow characteristics inside a radial IC of an industrial centrifugal compressor
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The study of intelligent scheduling algorithm oriented to complex constraints and multi-process roller grinding workshop Adv. Mech. Eng. (IF 1.161) Pub Date : 2020-11-26 Hanyang Li; Chao Wang; Sheng Jiang; Sheng Liu; Yiming Rong; Xuekun Li
Roller grinding workshop is a typical multi-unit and multi-task manufacturing scenario, which is aimed to repair the surface damage of the rollers caused by the rolling process, so that the rollers can be reused. Due to the process complexity of roller grinding workshop and the large volume and weight of the roller, hoisting and transportation mode with multiple cranes is required. Consequently, the
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Model predictive control for comfort optimization in assisted and driverless vehicles Adv. Mech. Eng. (IF 1.161) Pub Date : 2020-11-25 Sara Luciani; Angelo Bonfitto; Nicola Amati; Andrea Tonoli
This paper presents a method to design a Model Predictive Control to maximize the passengers’ comfort in assisted and self-driving vehicles by achieving lateral and longitudinal dynamic. The weighting parameters of the MPC are tuned off-line using a Genetic Algorithm to simultaneously maximize the control performance in the tracking of speed profile, lateral deviation and relative yaw angle and to
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DRNN-based shift decision for automatic transmission Adv. Mech. Eng. (IF 1.161) Pub Date : 2020-11-25 Kai-Qiang Ye; Hong Gao; Ping Xiao; Pei-Cheng Shi
In research on intelligent shift for automatic transmission, the neural network selected has no feedback and lacks an associative memory function. Thus, its adaptability needs to be improved. To achieve this, an automatic shift strategy based on a deep recurrent neural network (DRNN) is proposed. First, a neural network framework was designed in combination with an eight-speed gearbox that matches
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General fractional financial models of awareness with Caputo–Fabrizio derivative Adv. Mech. Eng. (IF 1.161) Pub Date : 2020-11-25 Amr MS Mahdy; Yasser Abd Elaziz Amer; Mohamed S Mohamed; Eslam Sobhy
A Caputo–Fabrizio (CF) form a fractional-system mathematical model for the fractional financial models of awareness is suggested. The fundamental attributes of the model are explored. The existence and uniqueness of the suggest fractional financial models of awareness solutions are given through the fixed point hypothesis. The non-number request subordinate gives progressively adaptable and more profound
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Exact analytical solution of the influence of an external centrifugal field and the heat transfer on a confined gas between two plates in the unsteady state Adv. Mech. Eng. (IF 1.161) Pub Date : 2020-11-25 Taha Zakaraia Abdel Wahid
This paper aims to study the non-stationary situation of the effectiveness of an external centrifugal force (ECF) and the heat transfer (HT) on the manner of neutral gas (NG). We solve a system of non-linear non-stationary partial differential equations, which represents an enormous task. Our model is examined to follow the manner of the macroscopic properties of the NG that bounded between two parallel
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Shape adaptation of beams (1D) and plates (2D) to maximise eigenfrequencies Adv. Mech. Eng. (IF 1.161) Pub Date : 2020-11-24 Simone Andresen; Laura M Lottes; Selina K Linnemann; Reinhold Kienzler
Finding the optimal structural design to avoid resonance has been a goal for decades. While recent applied methods often result in using additional active systems or higher mass, structural adaptation enables to shift eigenfrequencies without adding weight. The aim of this study is to investigate the influence of the structural adaptation of a beam and a plate on its eigenfrequency change, while varying
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