阀门电动装置渗油初探

渗油直接影响阀门电动装置的质量。本研究了阀门电动装置的密封机理,分析了产生渗漏的原因,从设计,工艺,生产等方面提出了解决措施。     

Exact thickness-shear resonance frequency of electroded piezoelectric crystal plates

INTRODUCTION In quartz crystal resonator design, the mass effec of the electrodes must be considered to achieve ac curate prediction of the fundamental thickness-shea frequency, as analyzed and demonstrated b Bleustein and Tiersten (1968), which is considered t be the exact frequency solutions in making necessar comparisons with solutions from two-dimensiona plate equations and deriving the correspondent cor rection factors (Mindlin, 1972). When the crysta plate is relatively thick or the…     

智能探路车的设计

设计了智能探路车。它分为四个部分：信息采集系统、信息处理系统、信息执行系统和信息监控系统。具有自动绕开障碍物、自动行驶的功能。     

Low power linear actuator for direct drive electrohydraulic valves

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.     

Modeling of sensor function for piezoelectric bender elements

An analytical sandwich beam model for piezoelectric bender elements is derived based on the first-order shear deformation theory （FSDT）, which assumes a single rotation angle for the whole cross-section and a quadratic distribution for coupled electric potential in piezoelectric layers. Shear coefficient is introduced to correct the effect of transverse shear strain on shear force and the electric displacement integration. Static and free vibration analyses of simply-supported bender elements are carried out for the sensor function. The results illustrate the high accuracy of the present model compared with the exact 2D solutions.     

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

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 micro-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 micro-robot can creep reliably in the large intestine of a pig and other contact environments.     

01M型自动变速器结构分析及其传动比计算

01M型自动变速器是捷达、宝来和帕萨特B4等车上配置的一款四速自动变速器,此自动变速器具有较强的代表性.为此,在对01M型自动变速器的结构进行分析的基础上,探讨01M自动变速器各档位传动路线及传动比,为从事汽车设计、机械设计、汽车维修的人员提供一定的理论依据.     

基于离子液体聚合物凝胶的新型柔性驱动器

设计了适用于仿生机器人系统的离子型电活性聚合物柔性驱动器结构,采用溶胶-凝胶法制备新型离子液体聚合物凝胶,涂布法制备活性炭电极,并组装成柔性驱动器。利用扫描电镜表征驱动器的微观结构,结合循环伏安法分析电化学性能,根据应力-应变曲线求出杨氏模量。在分析驱动器致动机理的基础上,对其驱动性能进行测试,结果表明研制的新型柔性驱动器在仿生机器人领域有很好的应用潜力。     

Active suspension control of a one-wheel car model using single input rule modules fuzzy reasoning and a disturbance observer

INTRODUCTION Research and development of active suspensionsystems for car models are increasing much in recentyears because the active suspension systems offergood riding comfort to passengers of high speedground transportation. Investigation of linear activesuspension systems has been mainly developed basedon optimal control theory assuming that the car modelis described by a linear or approximately linear sys-tem (Hác, 1986; Hrovat, 1993; Yoshimura and Su-gimoto, 1990). However,…     

轮式微型机器人运动机理与步态规划

在一种新型形状记忆合金驱动器的基础上,研制了一种微型蠕动机器人,该机器人采用轮式移动机构.对形状记忆合金驱动器、轮式移动机构的结构和运动机理以及机器人的步距扩大原理进行了讨论.并在此基础上,对机器人的直线运动步态和转弯步态进行了规划,使机器人在偏心轮自锁机构和换向机构作用下,不但可以前后运动,还具有主动转弯能力,在一定程度上克服了传统的形状记忆合金机器人移动速度慢、只能被动转弯的缺点.最后对形状记忆合金驱动器所需加热电流及该机器人的运动性能进行了试验分析.