检索结果-南通市图书馆

Low power linear actuator for direct drive electrohydraulic valves

在线全文

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2008年第7期9卷 940-943页

作者： Yong LI Fan DING Jian CUI Qi-peng LI State Key Laboratory of Fluid Power Transmission and Control Zhejiang University Hangzhou 310027 China School of Mechanical and Automobile Engineering Zhejiang University of Science and Technology Hangzhou 310023 China

This paper presents a bi-directional permanent-magnet linear actuator for directly driving electrohydraulic valves with low power consumption. Its static and dynamic performances were analyzed using the 2D finite element method,taking into account the nonlinear characterization and the eddy current loss of the magnetic material. The experiment and simulation results agree well and show that the prototype actuator can produce a force of ±100 N with the maximum power being 7 W and has linear characteristics with a positive magnetic stiffness within a stroke of ±1 mm. Its non-linearity is less than 1.5% and the hysteresis less than 1.5%. The actuator's frequency response(-3 dB) of the displacement reaches about 15 Hz,and the most significant factor affecting the dynamic performance is identified as the eddy current loss of the magnetic material.

关键词： Electrohydraulic valves linear actuator Low power High pressure Positive magnetic stiffness

Development of a masticatory robot using a novel cable-driven linear actuator with bidirectional motion

在线全文

学校读者我要写书评

暂无评论

Frontiers of Mechanical Engineering 2022年第4期17卷 53-65页

作者： Haiying WEN Jianxiong ZHU Hui ZHANG Min DAI Bin LI Zhisheng ZHANG Weiliang XU Ming CONG School of Mechanical Engineering Southeast UniversityNanjing 211189China Engineering Research Center of New Light Sources Technology and Equipment Ministry of EducationNanjing 210009China Department of Stomatology Zhongda Hospital Affiliated to Southeast UniversityNanjing 210009China Department of Mechanical&Mechatronics Engineering The University of AucklandAuckland 1142New Zealand School of Mechanical Engineering Dalian University of TechnologyDalian 116024China

Masticatory robots are an effective in vitro performance testing device for dental material and mandibular prostheses.A cable-driven linear actuator(CDLA)capable of bidirectional motion is proposed in this study to design a masticatory robot that can achieve increasingly human-like chewing *** CDLA presents remarkable advantages,such as lightweight and high stiffness structure,in using cable amplification and pulley *** work also exploits the proposed CDLA and designs a masticatory robot called Southeast University masticatory robot(SMAR)to solve existing problems,such as bulky driving linkage and position change of the muscle’s *** analysis and performance experiment validate the CDLA’s efficiency,with its stiffness reaching 1379.6 N/mm(number of cable parts n=4),which is 21.4 times the input wire ***,the CDLA’s force transmission efficiencies in two directions are 84.5%and 85.9%.Chewing experiments are carried out on the developed masticatory robot to verify whether the CDLA can help SMAR achieve a natural human-like chewing motion and sufficient chewing forces for potential applications in performance tests of dental materials or prostheses.

关键词： masticatory robot cable-driven linear actuator parallel robot stiffness analysis

Deduction of Design Equations for Durability Performance Improvement of Voice Coil Type linear actuator for Servo Valve Operation

在线全文

学校读者我要写书评

暂无评论

Journal of Energy and Power Engineering 2014年第3期8卷 515-522页

作者： Baek Ju Sung Department of System Reliability Korea Institute of Machinery & Materials Daejeon 305-343 Korea

The precise hydraulic valve is widely used in various industrial fields like aircraft, automobile and general machinery. linear actuator is the most important device for driving the precise hydraulic valve. The reliable operation of linear actuator has effects on the overall hydraulic system. The performance of linear actuator relies on frequency response and step response according to arbitrary input signal. In this paper, the analysis for the components of linear actuator is performed to satisfy the reliable operation and response characteristics through the reliability analysis, and also deducted the design equations to realize the reliable operation and fast response characteristics of voice coil type linear actuator for servo valve operation through the empirical knowledge of experts and electromagnetic theories. The design equations are suggested to determine the values of design parameters of linear actuator as like bobbin size, length of yoke and plunger and turn number of coil, and calculated the life test time of linear actuator for verification of reliability of the prototype. In addition, for reducing the life test time, the acceleration model of linear actuator is proposed and the acceleration factor is calculated considering the field operating conditions. And then, the achieved design values are verified through accelerated life test and performance tests using some prototypes of linear actuators adapted in servo valve.

关键词： linear actuator failure analysis design equation accelerated life test attraction force frequency response.

Position control of direct-drive permanent magnet linear actuators

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

中南大学学报（自然科学版） 2003年第z1期34卷 323-327页

作者： P M Churn Department of Electrical and Electronic Engineering University of Bristol BS8 1UB UK

The paper illustrates the typical variations of the direct-drive permanent magnet linear actuators and introduces two types of position control; a PI controller and a fuzzy controller. They respectively have their own advantages and disadvantages. The experiment have shown that the PI controller has better repeatability, while the fuzzy logic controller has smaller cumulative position square-error which can lead to a high positional accuracy.

关键词： direct-drive actuator linear actuator PI controller fuzzy controller

Re-engineering artificial muscle with microhydraulics

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Microsystems & Nanoengineering 2017年第1期3卷 278-285页

作者： Jakub Kedzierski Eric Holihan Rafmag Cabrera Isaac Weaver Massachusetts Institute of Technology Lincoln Laboratory LexingtonMA 02420USA

We introduce a new type of actuator,the microhydraulic stepping actuator(MSA),which borrows design and operational concepts from biological muscle and stepper *** offer a unique combination of power,efficiency,and scalability not easily achievable on the *** actuator works by integrating surface tension forces produced by electrowetting acting on scaled droplets along the length of a thin *** muscle,MSAs have liquid and solid functional components and can displace a large fraction of their *** 100μm pitch MSA presented here already has an output power density of over 200 W kg^(−1),rivaling the most powerful biological muscles,due to the scaling of surface tension forces,MSA’s power density grows quadratically as its dimensions are reduced.

关键词： artificial muscle electrowetting linear actuator microactuator microsystem microhydraulic stepping actuator

Development of a non-cable whole tectorial membrane micro-robot for an endoscope

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2008年第8期9卷 1141-1149页

作者： Dong-dong YE Guo-zheng YAN Kun-dong WANG Guan-ying MA Department of Instrument Shanghai Jiao Tong University Shanghai 200240 China

A novel non-cable whole tectorial membrane micro-robot for an endoscope is developed. The micro-robot we have fabricated and tested can propel itself in the intestine tract of a pig in an autonomous manner by earthworm-like locomotion. The silicone of bellow shape is laid over the outer surface of the micro-robot to reduce the affection of the viscoelastic properties of the intestine. Wireless power transfer and communication systems are employed to realize the non-cable locomotion of the mi-cro-robot. The prototype of the micro-robot is 13.5 mm in diameter and 108 mm in length. The experimental results show that the towing force for the micro-robot is about 0.8 N, which is much smaller than the maximum driving force 2.55 N of the linear actuator. The supplying power of the wireless power transfer system fulfills the needs of the micro-robot system and the mi-cro-robot can creep reliably in the large intestine of a pig and other contact environments.

关键词： Micro-robot Endoscope Intestine tract Silicone of bellow shape linear actuator Wireless power

Design Optimization and Comparison of linear Magnetic actuators under Different Topologies

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Electrical Engineering 2020年第1期6卷 41-51页

作者： Zhijian Ling Jinghua Ji Tao Zeng Wenxiang Zhao School of Electrical and Information Engineering Jiangsu UniversityZhenjiang 212013China Nanjin Canneng Electric Power Automation Co. Ltd.Nanjing 211199China

In this study,several types of linear actuators that adopt different permanent-magnet(PM)topologies are studied and *** linear actuators are based on the concept of PM magnetic screw transmission,which offers high force density,high reliability,and overload *** different magnetic configurations and assembly methods,these linear actuators are designed and optimized for a fair ***,based on the operating principle and maximum thrust force,the surface-mounted magnetic screw is described and ***,the embedded magnetic screw,Halbach array magnetic screw,and field modulated magnetic screw are investigated and *** electromagnetic performances,such as thrust force,torque,magnetic losses,and demagnetization effects are analytically assessed and verified using finite-element ***,a prototype of the surface-mounted magnetic screw is developed to validate the predictions.

关键词： linear actuator magnetic screw high force permanent magnet finite-element analysis

A Novel Bio-mimetic Wireless Micro Robot for Endoscope

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Donghua University(English Edition) 2008年第3期25卷 286-290页

作者：叶东东颜国正王坤东马官营 Institute of Precision Engineering and Intelligence Micro-System School of Electronics and Information TechnologyShanghai Jiaotong University

A novel bio-mimetic wireless micro robot for endoscope is developed. Its autonomous manner is earthworm-like and driven by linear actuators based on DC motor. It is different from the conventional micro robot endoscope that wireless module is used for conanunicating and power transfer. The fabricated micro robot system is detailedly described, including structure, micro robot locomotion principle, communication control module and wireless power transfer module. The experimental results show that the driving force of the linear actuator can reach to 2. S5 N and supplying power is up to 480 mW DC power for receiving coil in the proposed system, which all fulfill the need of the micro robot system. The micro robot can creep reliably in the large intestine of pig and other contact environments.

关键词： micro robot endoscope intestine linear actuator wireless power transfer