发布求助
文献互助 智能选刊 最新文献

Mechanika最新文献

筛选
英文 中文
Tuning of Mixing Zone Parameters in a Dynamic Mixer and Performance Comparison with Screw-based Mixers 动态混合器混合区参数的调整及与螺旋混合器的性能比较
IF 0.7 4区 工程技术
Mechanika Pub Date : 2023-08-09 DOI: 10.5755/j02.mech.33213
Jiagang Sun, Jiankang Wang, Yiwen Zheng, Zhijun Li
{"title":"Tuning of Mixing Zone Parameters in a Dynamic Mixer and Performance Comparison with Screw-based Mixers","authors":"Jiagang Sun, Jiankang Wang, Yiwen Zheng, Zhijun Li","doi":"10.5755/j02.mech.33213","DOIUrl":"https://doi.org/10.5755/j02.mech.33213","url":null,"abstract":"A new dynamic mixer has been designed for the mixing of two incompatible polymer melts. Three main design parameters (number of circles of holes (N), number of holes (M) per circle, and diameter of the holes (d3)) for the mixing zone of the dynamic mixer were selected to study their influences on the pressure drop (Δp) and the segregation scale (S) using Orthogonal tests. The influences of flow rate and rotational speed were also investigated. In addition, the mixing effect was compared with that of screw and slotted-screw mixers. The results showed that the most significant factor influencing S and S∙Δp is N. Both Δp and S increased with increasing flow rate, and decreased with increasing rotational speed. Compared to the screw and slotted-screw mixers, the dynamic mixer had a better mixing effect and shorter length.","PeriodicalId":54741,"journal":{"name":"Mechanika","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2023-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43779974","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Position Decoupling Control of Rigid Rotor of Active Magnetic Bearing 主动磁轴承刚性转子位置解耦控制
IF 0.7 4区 工程技术
Mechanika Pub Date : 2023-08-09 DOI: 10.5755/j02.mech.31642
Binglin Li, L. Zeng
{"title":"Position Decoupling Control of Rigid Rotor of Active Magnetic Bearing","authors":"Binglin Li, L. Zeng","doi":"10.5755/j02.mech.31642","DOIUrl":"https://doi.org/10.5755/j02.mech.31642","url":null,"abstract":"The magnetic bearing rotor system has the problem of positional coupling in the direction of the radial degrees of freedom. This paper proposes a linear output feedback method which decouples the multi-variable coupling system into four single-degree-of-freedom second-order integral subsystems. Firstly, a five-degree-of-freedom(5-DOF) mathematical model of active magnetic bearing rotor is derived. Then, a sliding mode variable structure controller is designed for the decoupled subsystems and the stability of system is guaranteed by the Lyapunov stability theory. The results of computer simulation show that the design controller of sliding mode variable structure controller can more effectively enhance the magnetic bearing rotor performance stability compared with the conventional PD controller, fuzzy PD controller, no matter in the position respond control and anti-disturbance control. Moreover, the sliding mode variable structure controller make the system have better tracking performance.","PeriodicalId":54741,"journal":{"name":"Mechanika","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2023-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43204579","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Kinematics & Compliance Validation of a Vehicle Suspension and Steering Kinematics Optimization Using Neural Networks 基于神经网络的车辆悬架运动学与顺应性验证及转向运动学优化
IF 0.7 4区 工程技术
Mechanika Pub Date : 2023-06-17 DOI: 10.5755/j02.mech.31983
Gurur Ağaki̇şi̇, F. Öztürk
{"title":"Kinematics & Compliance Validation of a Vehicle Suspension and Steering Kinematics Optimization Using Neural Networks","authors":"Gurur Ağaki̇şi̇, F. Öztürk","doi":"10.5755/j02.mech.31983","DOIUrl":"https://doi.org/10.5755/j02.mech.31983","url":null,"abstract":"Physical and virtual K&C analyses are performed to achieve the vehicle dynamics targets by finding the optimum variables such as the position of hardpoints or stiffnesses of bushings. However, finding appropriate design variables that meet all the aims is challenging. This paper evaluates a hardpoint optimization approach to attain suspension K&C characteristic objectives with the design of experiments, neural networks, and genetic algorithm, based on a reference compact-sized prototype vehicle. The MBD model correlation is provided to optimize the hardpoints to improve the vehicle's steering kinematics concerning Ackerman error and camber angle variation that are out of target in baseline suspension. The results showed that NN based optimization strategy to define the hardpoints has significantly improved targeted characteristics compared to conventional response surface methods in the limited design space.","PeriodicalId":54741,"journal":{"name":"Mechanika","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2023-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41712310","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Logistics Pure Electric Vehicle Routing Based on GA-PSO Algorithm 基于GA-PSO算法的物流纯电动汽车路径选择
IF 0.7 4区 工程技术
Mechanika Pub Date : 2023-06-17 DOI: 10.5755/j02.mech.31954
M. Wang, Qiyue Xie
{"title":"Logistics Pure Electric Vehicle Routing Based on GA-PSO Algorithm","authors":"M. Wang, Qiyue Xie","doi":"10.5755/j02.mech.31954","DOIUrl":"https://doi.org/10.5755/j02.mech.31954","url":null,"abstract":" Abstract:Based on current energy storage technologies such as batteries and fuel cells, the inherent battery capacity of electric vehicles puts constraints on their driving range and requires charging in the process of completing driving tasks. In this paper, with the current practical application in logistics industry as the background, from electric vehicle charging scheduling and path planning, a hybrid algorithm combining genetic-particle swarm algorithm is proposed to plan the best driving route for a group of electric logistics vehicles with vehicle load, vehicle battery life, charging facility location and customer time window as constraints and the total cost as the objective function. Based on the single distribution center, a more complex multi-distribution center electric vehicle path planning problem is considered. In this paper, multiple sets of Solomon VRPTW data sets are selected to test the prepared algorithm, and the results show that the algorithm can effectively plan the best distribution scheme.","PeriodicalId":54741,"journal":{"name":"Mechanika","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2023-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46850397","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Influence of Geometrical Shape on the Lubrication Performance of Partially Micro-Grooved Gas-Lubricated Parallel Slider Bearings 几何形状对部分微槽气体润滑平行滑块轴承润滑性能的影响
IF 0.7 4区 工程技术
Mechanika Pub Date : 2023-06-17 DOI: 10.5755/j02.mech.32384
Fuxi Liu, Chunjie Yang, Shanwu Xu, Kang Xie, Dunzhao Xie, Binhui Han, Zhanlong Li
{"title":"Influence of Geometrical Shape on the Lubrication Performance of Partially Micro-Grooved Gas-Lubricated Parallel Slider Bearings","authors":"Fuxi Liu, Chunjie Yang, Shanwu Xu, Kang Xie, Dunzhao Xie, Binhui Han, Zhanlong Li","doi":"10.5755/j02.mech.32384","DOIUrl":"https://doi.org/10.5755/j02.mech.32384","url":null,"abstract":"The influence of grooving parameters and micro-groove cross-section shape on the lubrication performance of partially micro-grooved gas-lubricated parallel slider bearings is investigated in the present study. The solution procedure for the multi-grid finite element method is that the algebraic equations formed by the finite element method are in turn smoothed by the interpolation from the coarse grid to the fine grid and the restriction from the fine grid to the coarse grid. By adopting the multi-grid finite element method, the pressure distribution of partially micro-grooved gas-lubricated parallel slider bearings is obtained. The grooving parameters are optimized to obtain the maximum average pressure for different micro-groove cross-section shapes. The results show that the orientation angle of the micro-grooves, depth of the micro-grooves, width of the micro-grooves, area density of the micro-grooves, micro-grooved fraction, and cross-section shape of the micro-grooves have an important influence on the hydrodynamic pressure of partially micro-grooved gas-lubricated parallel slider bearings. The results of this study demonstrate that the lubrication performance of partially micro-grooved gas-lubricated parallel slider bearings can be obviously enhanced by adopting the appropriate grooving parameters and micro-groove cross-shape. The results of this study is beneficial for the design of partially micro-grooved gas-lubricated parallel slider bearings.","PeriodicalId":54741,"journal":{"name":"Mechanika","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2023-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43779079","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Research on Pump Speed Control System Based on Fuzzy PID 基于模糊PID的水泵调速系统研究
IF 0.7 4区 工程技术
Mechanika Pub Date : 2023-06-17 DOI: 10.5755/j02.mech.32721
Yin Luo, Tao Jin, Xiao Li, Xuechong Qin, Yuejiang Han
{"title":"Research on Pump Speed Control System Based on Fuzzy PID","authors":"Yin Luo, Tao Jin, Xiao Li, Xuechong Qin, Yuejiang Han","doi":"10.5755/j02.mech.32721","DOIUrl":"https://doi.org/10.5755/j02.mech.32721","url":null,"abstract":"In this paper, based on MATLAB/simulink, the PID vector frequency conversion control of permanent magnet synchronous motor has better drive control performance in the multi-stage centrifugal pump speed control system. The electric-hydraulic coupling system of centrifugal pump has a good evaluation and research function. In view of the low efficiency of the traditional PID control method and the poor adaptability to the change of working environment, a vector control method of permanent magnet synchronous motor based on adaptive and self-adjusting fuzzy control principle is proposed for the speed regulation system of water pump. The simulation results show that the PMSM system controlled by the fuzzy PID controller is superior to the traditional PID control, and has better disturbance resistance, dynamic and steady performance.","PeriodicalId":54741,"journal":{"name":"Mechanika","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2023-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48459668","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Dynamic Research on Low-frequency Vibration Isolation Tables 低频隔振台的动力学研究
4区 工程技术
Mechanika Pub Date : 2023-06-17 DOI: 10.5755/j02.mech.32385
Gintas VISELGA, Vytautas TURLA, Ina TETSMAN, Jan Radek KAMINSKI
{"title":"Dynamic Research on Low-frequency Vibration Isolation Tables","authors":"Gintas VISELGA, Vytautas TURLA, Ina TETSMAN, Jan Radek KAMINSKI","doi":"10.5755/j02.mech.32385","DOIUrl":"https://doi.org/10.5755/j02.mech.32385","url":null,"abstract":"In the paper, an establishment of dynamic characteristics of tabletops of the newly-developed optical tables is being discussed upon. Low-frequency vibration isolation systems are reviewed. Theoretical and experimental tests have been performed. Dynamic models of an optical table on a vibrating platform at different excitations have been developed, the dynamic displacement and the resonance frequencies of the system have been established and vibration transmissibility curves have been presented. The obtained dynamic characteristics of the mechanical passive low-frequency vibration isolation system show that such a system is able to isolate the vibrations effectively. The results of the performed experimental tests confirm the data of the theoretical research.","PeriodicalId":54741,"journal":{"name":"Mechanika","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135525200","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Accessibility and Trajectory Planning of Cutter Changing Robot Arm for Large-Diameter Slurry Shield 大直径泥水盾构换刀机械臂的可达性及轨迹规划
IF 0.7 4区 工程技术
Mechanika Pub Date : 2023-06-17 DOI: 10.5755/j02.mech.30386
Mei Yang, G. Zeng, Yong Ren, Lai-kuang Lin, Wei Ke, Yifan Liu
{"title":"Accessibility and Trajectory Planning of Cutter Changing Robot Arm for Large-Diameter Slurry Shield","authors":"Mei Yang, G. Zeng, Yong Ren, Lai-kuang Lin, Wei Ke, Yifan Liu","doi":"10.5755/j02.mech.30386","DOIUrl":"https://doi.org/10.5755/j02.mech.30386","url":null,"abstract":"Aiming at solving the problems of huge cost, long cycle and high risky during manual cutter changing process for shield machine, a cutter changing robot was designed to adapt to its narrow and complex space, the workspace and motion path of cutter changing robot arm were studied. Firstly, by analyzing the internal space and cutter layout characteristic, the configuration of the robot arm was proposed, and the dimension of each rod was designed using multi-objective optimization method. The kinematic model of the robot arm was established by using the D-H model method to analyze its reachable working space. While the inverse kinematic model of the robot arm was solved by the Newton-Raphson iterative method to complete the trajectory planning of the arm for all cutter locations, where the relationship between the target position and the joint variables was established. The motion stability of the robot was verified by virtual simulation and test. The results show that the working space of the designed robot arm meets the cutter changing requirements that all the cutter position can be reached. Moreover, the power output of the drive is smooth, which can transport the cutter weighing up to 250kg.","PeriodicalId":54741,"journal":{"name":"Mechanika","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2023-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45646339","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Parametric study on the exergy analysis of a dual evaporator cooling cy-cle powered by the organic Rankine cycle 有机朗肯循环双蒸发器冷却系统（火用）分析参数研究
IF 0.7 4区 工程技术
Mechanika Pub Date : 2023-06-17 DOI: 10.5755/j02.mech.32652
Rabah Touaibi, Hasan Köten
{"title":"Parametric study on the exergy analysis of a dual evaporator cooling cy-cle powered by the organic Rankine cycle","authors":"Rabah Touaibi, Hasan Köten","doi":"10.5755/j02.mech.32652","DOIUrl":"https://doi.org/10.5755/j02.mech.32652","url":null,"abstract":"This study conducts a parametric study based on the energy and exergy analysis of a combined cycle composed of an organic Rankine and dual evaporator cooling cycles. The mechanical power supplied provides the mechanical compression refrigeration cycle with two evaporators. The influence of operating temperature, including the impact of the evaporator temperature of the organic Rankine cycle and the effect of dual evaporator cooling cycle evaporator temperature, were investigated; in this case, three organic fluids were employed such as R134a, R290, and R600. The results indicate that using R600 as the working fluid for both cycles enhance the system performance, and the energy efficiency of the combined system grows from 27.10 % to 40.22 %.The performance factor of the dual evaporator cooling cycle increases from 3.25 to 3.29 for the evaporating temperature of the first evaporator and from 2.07 to 4.28 for the second evaporator. Moreover, it is also noted that the exergy efficiency of the dual evaporator cooling cycle decreased from 40.03 % to 30.18 % for the first evaporator and increased by 32.47 % to 38.82 % for the second evaporator.","PeriodicalId":54741,"journal":{"name":"Mechanika","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2023-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44012233","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Influence of Temperature Variance on the Mechanical Properties of a Welded Bearing Support Flange Under Transient Conditions Using Finite Element Approach 温度变化对瞬态条件下焊接轴承支承法兰力学性能的影响
IF 0.7 4区 工程技术
Mechanika Pub Date : 2023-06-17 DOI: 10.5755/j02.mech.31209
Kishorekanna Gunasekaran, Isaac Solomon, R. Skvireckas, G. Dundulis
{"title":"Influence of Temperature Variance on the Mechanical Properties of a Welded Bearing Support Flange Under Transient Conditions Using Finite Element Approach","authors":"Kishorekanna Gunasekaran, Isaac Solomon, R. Skvireckas, G. Dundulis","doi":"10.5755/j02.mech.31209","DOIUrl":"https://doi.org/10.5755/j02.mech.31209","url":null,"abstract":"During a welding process, the influence of temperature distribution plays an important role affecting the vulnerable regions of the welded component. This research aims at presenting data on similar cases where a detailed comparative evaluation provides necessary data for designing a component based on its structural behaviour due to induced temperature variance during the groove welding process using finite element approach. \u0000The finite element simulations render a real-world scenario of the groove welding process by integrating the concept of ‘Moving heat source’ under transient conditions in ANSYS. The numerical comparative study is achieved by simulating a thermal study of the welded components of different bearing support flange plate thickness and evaluating its structural behaviour under induced thermal loads. \u0000The numerical solutions obtained from these simulations provide necessary data which helps in identifying the feasible design approach to increase the life of a welded component under such temperature-dependent conditions.","PeriodicalId":54741,"journal":{"name":"Mechanika","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2023-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47442292","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
首页 上一页 下一页 尾页
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整，为了账户安全，请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
请完成安全验证×
相关产品
×
本文献相关产品
联系我们：info@booksci.cn Book学术提供免费学术资源搜索服务，方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号：481959085
Book学术官方微信