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Effect of polishing roller structure on pressure distribution during the linear hydrodynamic polishing

INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY 2021年第1-2期115卷 627-636页

作者： Xie, Zhong Xu, Yaoyao Qi, Huan Cai, Donghai Wen, Donghui Zhejiang Univ Technol Key Lab Special Purpose Equipment & Adv Proc Tech Minist Educ & Zhejiang Prov Hangzhou 310014 Peoples R China Taizhou Vocat & Tech Coll Sch Mech & Elect Engn Taizhou 318000 Peoples R China Focused Photon Hanghzou Inc Hangzhou 310012 Peoples R China

The effect of roller structural parameters on polishing flow field pressure during linear hydrodynamic polishing (LHP) was optimized by applying orthogonal test design. We used CFD simulation results to analyze the effect of structural parameters on the magnitude and uniformity of hydrodynamic pressure. By using the nlinfit fitting method, multiple nonlinear regression equations for the hydrodynamic pressure mean and mean square deviation of the structural parameters were obtained. A genetic algorithm that could globally search for the optimal solution in the independent variable range was used to obtain optimal structure parameters. We found that the magnitude and uniformity of dynamic pressure on the polished surface were improved. Experimental results showed that surface scratches on the polished surface were significantly reduced, and the excellent surface roughness could be obtained under different polishing processing conditions.

关键词： Linear hydrodynamic polishing Hydrodynamic pressure Ultra-smooth surface structural parameter optimization

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Innovation of vapor-feed microfluidic fuel cell with novel geometric configuration and operation parameters optimization

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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY 2021年第29期46卷 15976-15990页

作者： Ouyang, Tiancheng Lu, Jie Chen, Jingxian Xu, Peihang Tian, Zhi Qun Guangxi Univ Sch Mech Engn Nanning Peoples R China Guangxi Univ Guangxi Key Lab Proc Nonferrous Met & Featured Ma Nanning Peoples R China

The harmless reaction process makes the fuel cells possess the environment-friendly characteristic, but the application of fuel cells is limited by their low fuel utilization. To improve this, a model of vapor-feed microfluidic fuel cell with a novel geometric configuration is established in present study, and the effects of various parameters on cell performance are investigated in detail. Simulation results show that structural parameters contribute significantly to the improvement in cell performance. After a series of optimizations, the maximum power density of 47.43 mW/cm(2) is achieved, the fuel utilization and exergy efficiency are increased to 46.03% and 5.24%, respectively. This indicates that the structural optimization measures such as tower-type gas chamber and embedded electrode are significant for improving the performance of the vapor-feed microfluidic fuel cell. (C) 2021 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.

关键词： Vapor-feed microfluidic fuel cell Gas chamber type Energy conservation Exergy efficiency structural parameter optimization

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Orthogonal analysis method for multi - Objective optimization of CO2 nozzle thermodynamic performance

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THERMAL SCIENCE AND ENGINEERING PROGRESS 2023年 45卷

作者： Zhang, Zixuan Lu, Zhaijun Fan, Dengke Wang, Jiaqiang Yao, Shujian Cent South Univ Sch Traff & Transportat Engn Key Lab Traff Safety Track Minist Educ Changsha 410075 Peoples R China Joint Int Res Lab Key Technol Rail Traff Safety Changsha 410075 Peoples R China Cent South Univ Natl & Local Joint Engn Res Ctr Safety Technol Rai Sch Traff & Transportat Engn Changsha 410075 Peoples R China

In this study, the structural parameters of the converging diverging (CD) nozzle in a subcritical or supercritical CO2 cycle system were optimized by L16 (44) orthogonal design. The established model was used to analyse the effect of divergence length Ld, divergence angle theta, convergence angle alpha and throat diameter Dth on the nozzle thermodynamic performance, and further optimization of CD nozzle structural parameters was carried out using comprehensive evaluation coefficients and comprehensive scores. The results indicate that Ld is the primary factor, and while the effects of theta and Dth were inconsistent in different application scenarios, attention should be paid to the size parameters of the nozzle divergence part during design. For CD nozzles with supercritical inlet pressure, there is a linear relationship between Ld and exergy destruction, while for subcritical CD nozzles, the effect of Ld is reduced. For a CD nozzle used in subcritical or transcritical cycles, the outlet exergy and exergy efficiency of the modified nozzle could be increased by 16.4% and 16.2%. For supercritical nozzles used in the Brayton cycle, the optimized exergy destruction was relatively reduced by 37%. The mass flow rate of the nozzle before and after optimization was reduced, with a maximum decrease of 22.7%, which is beneficial for improving the entrainment ratio of the ejector. In addition, it was found that considering this in the modelling process would lead to conservative optimization results. These research results could provide a reference for the design of the CO2 nozzle or motive nozzle of ejector.

关键词： Phase slip Exergy destruction Orthogonal design structural parameter optimization

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Design optimization of Electrical Structure parameters of Induction Asynchronous Mechanical-Electric-Hydraulic Power Coupler

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PROCESSES 2023年第7期11卷 2217页

作者： Wang, Junyi Zhang, Tiezhu Zhang, Hongxin Zhang, Zhen Chen, Hao Qingdao Univ Coll Mech & Elect Engn Qingdao 266071 Peoples R China

In response to the problems of considerable size, loose structure, and low energy conversion efficiency of multi-energy power coupling devices, this paper makes improvements based on the mechanical-electric-hydraulic power coupler proposed by our research group. We propose a new asynchronous mechanical-electric-hydraulic power coupler (IA-MEHPC). This mechanism integrates a traditional three-phase asynchronous motor with a swashplate axial piston pump/motor to realize the mutual conversion of electrical, mechanical, and hydraulic energy. Compactness, efficiency, and adaptability are the distinguishing features of the complex. This paper builds a three-dimensional model of the IA-MEHPC and a two-dimensional theoretical model of the electrical structure (motor part). Moreover, the electrical structure parameters of the IA-MEHPC are optimized using an approximate response surface-based optimization method. The maximum motor peak torque and minimum torque fluctuation are identified as optimization objectives, and we obtain the optimal combination of parameters. The simulation results show that, compared to the pre-optimized structure, the peak motor torque of the optimized IA-MEHPC is increased by 5.78%, and the torque pulsation coefficient is reduced by 15.83%, in line with engineering practice expectations. This paper innovatively proposes and optimizes IA-MEHPC, which is significant for developing hybrid mechanical devices and subsequent research.

关键词： electric vehicle electro-mechanical-hydraulic coupling response surface modeling structural parameter optimization

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A robotic surgical tool with continuum wrist, kinematically optimized curved stem, and collision avoidance kinematics for single port procedure

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MECHANISM AND MACHINE THEORY 2022年 173卷

作者： Wu, Zhonghao Zhu, Chuanxiang Ding, Yue Wang, Yifan Xu, Bin Xu, Kai Shanghai Jiao Tong Univ UM SJTU Joint Inst Shanghai 200240 Peoples R China Shanghai Jiao Tong Univ Sch Mech Engn Shanghai 200240 Peoples R China Shanghai Jiao Tong Univ Shanghai Peoples Hosp 9 Dept Urol Sch Med Shanghai 200011 Peoples R China

Robot-assisted minimally invasive key-hole surgeries have thrived in recent decades, primarily robotic MPL (Multi-Port Laparoscopy) and SPL (Single Port Laparoscopy). In robotic MPL, surgical manipulators are mainly equipped with straight-stemmed tools with distal wrists. For robotic SPL, when these MPL tools and manipulators are used via a single entry, they often suffer from mutual collisions. On the other hand, dedicated SPL manipulators/tools usually lack adequate payload capabilities due to the slim multi-joint designs. To facilitate SPL, a SORST (Stem-Optimized Robotic Surgical Tool) with a continuum wrist and a kinematically optimized rigid curved stem is proposed. The SORST's curved but rigid stem can help reduce possible collisions and maintain the tool's payload capability. In this curved-stem tool, the tendon tension might be difficult to properly maintain, due to the fact that the tendon may get in contact with the guiding cannula with uncertain friction. Hence, the continuum wrist is introduced for enhancing distal dexterity. Furthermore, an instantaneous inverse kinematics framework is proposed to simultaneously avoid mutual collisions and satisfy the remote-center-of-motion constraint, joint range/velocity limits, and the desired task space twist. Extensive experimental verifications were conducted to demonstrate the efficacy.

关键词： Collision Avoidance Continuum Mechanism structural parameter optimization Single Port Laparoscopy Surgical Robots

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optimization of structural parameters for a New-Type Magnetic Integration Structure CRT Considering Loss and Cost

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IEEE ACCESS 2020年 8卷 68525-68532页

作者： Wang, Tiange Liu, Jing Wang, Yuyuan Hui, Liangliang Shaanxi Railway Inst Weinan 714000 Peoples R China

The optimization of structural parameters of controllable reactor of transformer type (CRT) is of great significance for improving its economic benefits. This paper takes the new-type magnetic integration structure CRT as the research object. Qualitative analysis is employed to explore the relationship between loss, cost and structural parameters of CRT. The optimization model of structural parameters is established with the objective of minimizing cost and loss. The genetic algorithm is used to optimize the structural parameters of CRT. Based on this, a new economic calculation method of CRT & x2019;s structural parameters is proposed. The results show that the optimization of CRT & x2019;s structural parameters aiming at minimizing cost and loss is essentially to optimize the cross-sectional area of iron core and the length of winding coil. A new method for calculating CRT & x2019;s structural parameters based on genetic algorithm optimization has more reasonable calculation results. With the increase of CRT operating time, the proportion of CRT use costs caused by loss will gradually increase. The methods and conclusions used in this paper provide some theoretical guidance for the structural design and optimization of CRT.

关键词： Cost loss magnetic integration structure CRT structural parameter optimization

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Energy Saving Design and optimization of suspension System in Baja Competition for College Students

Energy Saving Design and Optimization of suspension System i...

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作者： Taiyu Ning Wengang Chen Jifei Chen College of Mechanical and Transportation Southwest Forestry University

The suspension design and optimization of Baja car were carried out on the premise of meeting the rules of the race in order to improve the handling stability and ride smoothness of the car. Firstly established the 3d modelling software UG in suspension system 3d model, the according to the design of the frame model of hard point ADAMS motion simulation model of motion simulation analysis and optimization selection of parameters, stress suspension system was analyzed by ANSYS, ensure the strength of the car, according to the four-wheel positioning parameters of suspension system and, along with the change of wheel parallel to beat curve using ADAMS/Insight module for parametric curves were optimized. Combined with the design and optimization, the front wheel camber angle changed from 0.81 to 0.68, the caster angle changed from 5.66 to 5.84, the caster angle changed from 6.35 to 6.42, and the front wheel toe angle changed from-1.48 to 0.99, jumping up and down in front wheel track changes reduced from 100 mm to 50 mm, swing arm to connect hard point rise of the front suspension arm Angle smaller, ultimately achieve steering the car light, effectively improve the performance of the car.

关键词： Baja Racing Suspension system ADAMS simulation and optimization ANSYS analysis structural parameter optimization

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Analysis of pressure-bearing performance and optimization of structural parameters of the slip in a compression packer

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SCIENCE PROGRESS 2020年第1期103卷 36850419881106-36850419881106页

作者： Tang, Yang Sun, Peng Wang, Guorong Li, Wang Southwest Petr Univ Sch Mechatron Engn 8 Xindu Ave Chengdu 610500 Sichuan Peoples R China Southwest Petr Univ State Key Lab Oil & Gas Reservoir Geol & Exploita Chengdu Sichuan Peoples R China Southwest Petr Univ Key Lab Oil & Gas Equipment Minist Educ Chengdu Sichuan Peoples R China Southern Marine Sci & Engn Guangdong Lab Zhanjian Zhanjiang Peoples R China

In drilling and completion operations, a packer is a downhole tool to seal the annular space between various sizes of string and borehole. As a key component of packer, slip plays a role of fixed support in the process of setting, thus ensuring a long-term stable sealing of the packer. Aiming at the problem of damage caused by casing pressure on the slip after setting, based on the stress analysis of slip during setting, the slip material with hardness lower than casing was selected, and its finite element analysis model was established. Then, the pressure-bearing law of the slip teeth under three tooth parameters was analyzed. The results of analysis were as follows. With the increase of the number of slips or the distance between teeth or tooth top angle, the strain of slips decreased, but the bending moment of slips increased. At the same time, orthogonal test method was used to optimize the parameters of the slips. The conclusion is that the tooth top angle is 90 degrees, the distance between teeth is 6 mm and the number of teeth is 16, which is the best combination of compressive effect. It will provide a reference for improving the long-term effectiveness of the packer seal in drilling and completion engineering.

关键词： Slip finite element analysis packer pressure-bearing performance structural parameter optimization

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optimization design and rock-breaking characteristics analysis of a self-propelled swirling multi-jet bit

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ENERGY SCIENCE & ENGINEERING 2018年第6期6卷 716-726页

作者： Bi, Gang Li, Mengmeng Dou, Liangbin Qu, Zhan Zhao, Kai Xian Shiyou Univ Coll Petr Engn Xian Shaanxi Peoples R China Xian Shiyou Univ Shaanxi Key Lab Well Stabil & Fluid & Rock Mech O Xian Shaanxi Peoples R China China Univ Petr State Key Lab Petr Resources & Prospecting Beijing Peoples R China

High rock-breaking efficiency with limited discharge rate and increasing the extension capacity of the radial horizontal hole as far as possible are the key of the novel radial horizontal drilling technology. The performance of jet bit is the primary problem to be solved in this key technology. Based on multijet bit, a self-propelled swirling jet bit was developed, and the design method was also presented. By conducting rock-breaking experiments, the type and structural parameters of the self-propelled swirling jet bit were optimized. The results demonstrate that when the jet pressure and standoff distance are constant, the rock-breaking efficiency of self-propelled combined swirling and round multijet bit is better than that of a self-propelled swirling multijet bit. The combined swirling and round multijet bit with 1 + 4 holes is optimal. Since many structural parameters influence the rock-breaking efficiency of the self-propelled swirling jet bit, the optimal values for the structural parameters can be determined by adjusting the rock-breaking capacity and drilling performance with different structural parameters. The proposed novel jet bit improves the speed of radial horizontal drilling significantly.

关键词： design of jet bit radial horizontal drilling rock-breaking self-propelled swirling jet structural parameter optimization

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Static Decoupling Performance Analysis and Design of Bionic Elbow Joint

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JOURNAL OF BIOMIMETICS BIOMATERIALS AND BIOMEDICAL ENGINEERING 2018年 36卷 34-44页

作者： Cui, Bingyan Chen, Liwen Xie, Yongtao Hu, Yuda Yanshan Univ Qinhuangdao 066009 Peoples R China North China Univ Sci & Technol Tangshan 063009 Peoples R China Widex Sanit Co Ltd Tangshan 063000 Peoples R China

The static decoupling performance is closely related to the efficiency of the bionic elbow joint mechanism. The bionic elbow joint has good static decoupling and has high efficiency and carrying capacity. First, the movement structure and characteristics of the elbow joint are analyzed, a kind of bionic elbow joint is proposed, the position inverse solution is deduced, and force Jacobin matrix of the bionic elbow joint is obtained. Second, the static coupling performance evaluation index and the global static coupling performance index are established, the performance atlas are drawn. Thirdly, by use of the Monte Carlo method the structural parameters of the bionic elbow joint are optimized and selected based on the spatial model theory, and a novel the bionic elbow joint is designed based on parameters optimization, and the static decoupling is verified by the simulation experiment of the bionic elbow joint. The analysis results shows the static decoupling performance of the bionic elbow joint is symmetrical, and with the working space of the attitude output angle e. increases, the static decoupling decreases gradually. structural parameters R-e1 and R-e3 have great influence on the global static decoupling performance. The structural parameters of R-e1 is 90mm, R-e2 is 70mm, and R-e3 is 30mm, the bionic elbow joint has good static decoupling. This paper lays a foundation for further analysis and research of the bionic elbow joint.

关键词： structural parameter optimization static decoupling performance bionic elbow joint the space model theory 2-DOF

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