复合式MEMS微夹持器研制

研制了一种针对亚毫米微小构件实施稳定夹取及可靠释放的微夹持器,应用MEMS体硅工艺将静电梳齿驱动与真空驱动集成构成复合式驱动,设计了微夹持器静电驱动控制系统以及真空控制系统。在80V的驱动电压下,微夹持器末端夹爪位移25μm。设计了两种尺寸的微夹持器,一种张合量为100µm～150µm,另一种为150µm～200µm。针对100～200µm的小球进行了微操作实验,实验结果证明静电梳齿驱动结合真空吸附能够使夹取操作更加稳定,基于闭环控制的正压气流能有效克服小球与夹爪之间的粘附力,实现了可靠的释放操作。     

微夹钳技术发展现状及应用研究

微夹钳是最典型的微执行器,它可以充当机器人手爪,配合各种多自由度驱动装置成为微机器人。微夹钳单元技术与微装配、微操作、微焊接、微封装等系统技术紧密地联系在一起。由于它的重要性和广泛的应用,近年来已成为微机械领域研究的热点。本文首先介绍了微小领域中物体夹持的物理背景,阐述了粘附力的规律和解决方法;详细介绍了已有的微夹钳的研究进展状况,结合作者的科研工作,阐述了有代表性的几种微夹钳的工作原理及工艺制作方法;指出了微夹钳的发展和功能优化方向,以期对微夹钳的研究工作起到一定借鉴作用。     

Development of a high precision flexure-based microgripper

This paper presents the design and development of a high precision microgripper for micromanipulation. The design is based on a hybrid flexure-based compliant mechanism and a bias spring structure which render high fidelity and inherent mechanical advantages. Finite element analysis (FEA) was conducted to evaluate responses of the model under specified load and displacement to investigate optimum design of the model. The prototype of the proposed microgripper was fabricated using electro-discharge machining (EDM) process. An experimental study of the performance was carried out and the results are presented. The experimental results are also compared with the computational analysis results. The results show that a high level of displacement amplification and a maximum stroke of 100 μm can be achieved.     

喉部手术机器人手指系统设计

喉部手术机器人手指系统是针对喉部手术自身特点及要求而开发的一套手指系统.该系统由驱动机构和末端工具两部分组成,拥有旋转和开合两个自由度,并能快速更换末端工具,使机器人具有足够的自由度与灵活性,满足手术中位姿和动作要求.动物试验证明该手指系统满足喉部手术的各种要求.     

一种双目分时显微立体成像系统的研制

微操作系统进行三维精细操作,要求视觉传感器输出立体感较强的图像。本文在论述立体成像发展概况和基本原理的基础上,应用双目分时多路显示技术,设计和研制了微操作系统中的显微立体成像系统,并指出该系统的优点和不足。     

微超声振动机器人系统的设计与分析

设计一套微超声振动机器人系统用于细胞切割.超声振动单元安装在并联机器人的动平台上,压电陶瓷驱动器控制操作针做高频振动,直到刺破细胞的壁膜,减少穿刺过程中细胞的变形,从而减小对细胞的损伤.该系统用于牛卵细胞微切割试验,取得很好的效果.     

面向生命科学领域的微操作技术的研究综述

在生命科学领域的研究中，操作对象的微小性迫切要求进行与之相适应的微操作技术的研究。总结了生命科学领域中微操作机器人的应用现状及系统特点，对微操作机器人系统研制中涉及的一些关健技术作了简要的分析，并对微操作技术在生命科学领域中的发展前景进行了展望。     

Computational parametric analysis and experimental investigations of a compact flexure-based microgripper

This paper presents a flexure-based piezoelectric actuated microgripper for high precision grasping/releasing tasks. The design of the microgripper consists of a three-stage amplification and transmission mechanism, and the parallel grasping technique. A bridge-type mechanism and two sequential lever-type mechanisms are symmetrically connected to amplify the output displacement of the embedded piezoelectric actuator. The parallelogram mechanisms assist in linearizing the output displacement of both jaws of the microgripper. The computational analysis is conducted to investigate the effect of the dimensional parameters on the characteristics of the microgripper. A computational parametric optimization methodology is established to achieve the required attributes of the microgripper. The design optimization resulted in a compact design, a high displacement amplification ratio, and a large output displacement of the microgripper. The experimental studies are conducted to investigate the key characteristics of the microgripper such as the displacement amplification ratio, the output displacement, tracking performance. Further, the parasitic motion, input-end and output-end motion resolution of the microgripper are identified. The experimental results indicate that the compact microgripper can achieve a high displacement amplification ratio and large output displacement with a high positioning accuracy.     

Control and dynamic releasing method of a piezoelectric actuated microgripper

This paper proposes the control and dynamic releasing method of a symmetric microgripper with integrated position sensing. The microgripper adopted in this micromanipulation system is constructed by two L-shaped leverage mechanisms and the fingers of the microgripper is machined much thinner than the gripper body. A combined feedforward/feedback position controller is established to improve the motion accuracy of the microgripper in high frequency. The feedforward controller is established based on rate-dependent inverse Prandtl-Ishlinskii (P–I) hysteresis model. The inertial force generated in dynamic based releasing process is analyzed through MATLAB simulation. Open-loop experimental tests have been performed, and the results indicate the first natural frequency of the microgripper is 730 Hz. Then experiments in high frequency based on the developed combined controller are carried out and the results show the tracking error of a superimposed sinusoidal trajectory with the frequency of 100 Hz, 120 Hz and 130 Hz is 6.4%. Finally, the tiny objects releasing experiments are conducted where the combined controller is used to control the motion amplitude and frequency to achieve inertial force controllable to improve operation accuracy. And the results show that the dynamic releasing strategy is effective.     

生物工程中的微操作机器人系统

对微操作在生物工程的作用作了简要叙述,着重介绍了当前国内外微操作机器人系统的发展状况。在广泛调研的基础上提出了比较理想并切实可行的面向生物工程的微操作机器人系统的物理结构。     

3-PTT并联微操作机器人工作空间分析

研究了 3- PTT空间并联微操作机器人机构的工作空间 ,分析了驱动杆伸长量和运动副转角等限制因素对工作空间的影响。通过圆柱坐标数值搜索算法求得工作空间的边界和体积 ,并通过计算机仿真给出了 3- PTT空间并联微操作机器人机构工作空间的三维可视化描述。     

Design and performance evaluation of a 3-DOF mobile microrobot for micromanipulation

In this paper, a compact 3-DOF mobile microrobot with sub-micron resolution is presented. It has many outstanding features: it is as small as a coin ; its precision is of sub-micrometer resolution on the plane; it has an unlimited travel range; and it has simple and compact mechanisms and structures which can be realized at low cost. With the impact actuating mechanism, this system enable both fast coarse motion and highly precise fine motion with a pulse wave input voltage controlled. The 1-DOF impact actuating mechanism is modeled by taking into consideration the friction between the piezoelectric actuator and base. This modeling technique is extended to simulate the motion of the 3-DOF mobile robot. In addition, experiments are conducted to verify that the simulations accurately represent the real system. The modeling and simulation results will be used to design the model-based controller for the target system. The developed system can be used as a robotic positioning device in the micromanipulation system that determines the position of micro-sized components or particles in a small space, or assemble them in the mesoscale structure.     

联合储库用自动运行物料搬运系统

对联合储库用自动运行物料搬运系统进行了概述,概述联合储库的存储方式,主要介绍了自动运行物料搬运系统的组成和功能,简单介绍了系统的应用情况。联合储库用自动运行物料搬运系统,采用新式机械构造设计、新型自动控制系统,使联合储库用物料搬运系统自动化程度有了质的提高,不同于普通的物料搬运系统,自动运行物料搬运系统主要在于能够结合厂内其他设备,根据运行指令自动运行,大大减少了操作人员数量,降低了操作人员成本,提高了物料搬运系统自动化水平,推动工厂自动化发展。     

Profibus总线系统在摩托车生产线物流系统中的应用

Ｐｒｏｆｉｂｕｓ总线系统成功地应用于摩托车生产企业的集成化物流系统,并采用了ＲＳ－４８５传输数据和电源。论述该集成化物流系统的硬件配置和通讯方式。     

港口岸边装卸设备运行监控与管理系统的开发

分析研究港口岸边装卸设备动态数据监测技术和无线通信技术,开发无线监控系统,实时在线获取港u岸边散货装卸设备的精确数据信息;通过无线通信技术对装卸设备中央拄制器(PLC)进行远程状态监控,实现港口岸边装卸设备的运行监控与综合管理.     

Performability-based fleet sizing in a material handling system

This research examines the problem of determining the optimal fleet size for fixed-path material handling systems on the bases of performance and reliability, simultaneously. In this paper, a regression model is developed to study the relationships among various material handling system design characteristics (fleet size, guide path layout, and number of P/D stations, vehicle speed and failure rates, guide path intersection failure rates, and P/D station failure rates) and performability, measured as the average number of material moves between failures (MBF). The regression model highlights the important relationships between the selected factors and performability, and may be used to determine the performability-based optima for the controllable design characteristics.     

A soft moulding process for manufacture of net-shape ceramic microcomponents

A soft moulding process for manufacture of ceramic microcomponents, alumina and Al₂O₃/SiC composite, is introduced in this paper. The process involves fabrication of SU-8 master moulds and production of mirrored polydimethysiloxane (PDMS) soft moulds. Green parts are formed in the PDMS moulds by filling the ceramic slurry into the soft moulds and net-shape green components are obtained after demoulding. The methods for the mould filling using different suspensions were demonstrated: one was aqueous suspension for alumina microcomponent and another was non-aqueous suspension for Al₂O₃/SiC microcomponent. The measurements showed that the proposed soft lithography process is successful in producing ceramic microcomponents and retaining the fine features in micron scale.     

A new design of piezoelectric driven compliant-based microgripper for micromanipulation

This paper describes the development of a microgripper mechanism capable of delivering high precision and fidelity manipulation of micro objects. The mechanism adopts a flexure-based concept on its joints to address the inherent nonlinearities associated with the application of conventional rigid hinges. A combination of two modeling techniques namely Pseudo Rigid Body Model (PRBM) and Finite Element Analysis (FEA) was implemented to expedite the prototyping procedure which leads to the establishment of high performance mechanism. A wire Electro Discharge Machining (EDM) technique was utilized to fabricate the monolithic structure of the gripper mechanism. Experimental studies were conducted on the model prototype to obtain various correlations governing the gripper performance as well as for model verification. The experimental results demonstrate a high level of integrity in comparison to the computational analysis. A high amplification characteristic and maximum stroke of 100 μm can be achieved.     

起重运输机械现代化安全管理系统研究

安全管理信息系统是现代安全管理中安全信息综合处理的枢纽 ,是安全信息管理、安全决策的关键。在分析起重运输机械管理的特点和发展状况的基础上 ,论述了企业安全管理信息系统所包括的内容 ,详细介绍了各子系统结构和功能。