Applied Mechanics and Materials Vols. 101-102

Abstract: With the enhancement of environmental protection consciousness, people pay increasingly attention to sustainable design all over the world recent years. Sustainable design is still in the early stage in China. Applying it in commercial operation is more helpful to promote sustainability in society. According to the survey, young people have strong environmental awareness relatively. There’re already many corporations have used sustainable idea in design for youth products successfully. This paper presents that sustainable design need to consider fully about the relationship among people, environment and economic. In accordance with the demands of youth to take different methods of sustainable design flexibly will benefit both to environment and human being.

Abstract: Linear ultrasonic motors have been of significant research interests for its excellent characteristics, but it’s hindered by complicated structure. The purpose of this paper is to design and manufacture a prototype by utilizing ANSYS software based on the analysis of mechanism. The vibrator of linear motor is composed of a three teeth rectangular medal block, two group of PZT elements which is adhered on the surface of metal block and slider. It is found that the result of FEA analysis is consistent with experiment result.

Abstract: The reconfiguration and the capacity of rapid adjustment of automotive welding fixture are the main obstacle to the development cycle and the modified automotive products. A set of reconfigurable fixture has been designed tentatively for a series of car product development. It is consisted of the fixture plate with holes in base stations, the three-dimensional adjustment of bearings and the standard fixtures, which show the character of a quick installation location, easy to adjust, shorten the development cycle and so on.

Abstract: Lubrication and sealing are the key research points in water hydraulic technology. A better seal is provided by the structure form of the poppet valve comparing to the spool valve, however, poorer linearity and control accuracy accompanies inevitably. Aiming at improving the control performance of poppet valves, the design of the water hydraulic digital valve is analyzed in this paper. A high speed digital valve is designed and controlled by PWM (Pulse-Width Modulation) and actuated by a piezoelectric ceramic stack with high frequency response and control stiffness. Another new design using poppet valves for digital bits is proposed to ensure enough seal ability and lower the cost of the valve, namely the multi-digit on-off valve. The simulation models of these two types of valves are built and the results show the different performances between the valves. The high speed digital valve is provided with high control accuracy and responsiveness. In contrast, large overshoot and oscillation are encountered during switching on the digits of the multi-digit on-off valve. Especially the switching process of the high digital bits requires to be regulated to reduce the large overshoot. The above analysis contributes to the improvement of lubrication and sealing in water hydraulic control valves and applications of water hydraulics in the industry.

Abstract: Rheology is an important property of MRF (Magnetorheological fluids) and an important basis for designing a MRF device. For researchers and engineers, therefore, a practical and reliable magnetorheometer is certainly required for the study and application of the MRF and its devices. In this paper, the principle of a novel magnetorheometer was introduced, the structure and the function of major components were explained, the test process for the rheological property of the MRF by using this magnetorheometer was illustrated, the distribution of the electromagnetic field in the gap, where the MRF is filled, was analyzed by means of ANSYS software tools, and experiments were conducted to ascertain the validity of the magnetorheometer.

Abstract: In mechanical equipments or manufacturing processes, force control is definitely required to achieve desired performance or to ensure product quality. Aiming at this issue, this paper introduced an author-invented torque servo device that utilizes magnetorheological fluids (MRF) to provide a controllable torque. In the paper, the structure and working principle of the MRF-based torque servo device (MRT) were introduced, the constitutive model and the characteristics of the MRF were established and discussed. On the basis, the static and dynamic models of the MRT were both analytically and experimentally studied, and the control of the output torque of the MRT was demonstrated. As an example, the application of the MRT to the polishing of aspheric surfaces was presented in the end.

Abstract: A new piezoelectric in-plane traveling mechanism of miniature robot was proposed. It seems like a small tripod-type device and runs on stick-slip principle. There were three actuators acted as feet in the traveling mechanism. They were driven separately and controlled through a microcontroller unit to realize varied motion. Theoretically, the mechanism could revolve around any axis and translate along any direction under the appropriate control manner. Therefore, it was desired to serve as locomotive units for miniature robot, which perform various precise positioning tasks such as micromachining, micro-assembly etc.

Abstract: A new piezoelectric rotary mechanism for precise positioning was proposed. It was designed in asymmetrically configuration of two sets of cantilever bimorphs with end-mass. And the frictional force between the revolving shaft and axle housing can be adjusted within potential range. The rotary actuator can run silently and smoothly on sine wave electric voltage. The dynamic characteristics have been tested on assembled prototype. The rotary actuator is desired to used in micromachining or micro-assembly etc.

Abstract: Considering assembly and disassembly of micro-gripper, connection and isolation of lead, a new micro-gripper based on piezoelectric bimorphs is designed by using finite element analysis. First, a detailed structure of the micro-gripper is designed based on piezoelectric bimorph cantilevered beams. Second, static and dynamic characteristics of the micro-gripper are analyzed by piezoelectric coupling field analysis technique of ANSYS. For the static performance, there is a linear relationship between displacement and driving voltage of the micro-gripper. The maximum displacement of the micro-gripper finger is about 81.9 μm under the maximum driving voltage 200 V. For dynamic performance, the natural frequency and the response time of the gripper is about 45 Hz and 1.1 ms, respectively. The micro-gripper could meet the designed needs.

Abstract: Combined with the current product image research status and development trend, based on the conception and relationship of the enterprise image and product image, we propose a method which is from different product image differentiation and the product image consistency to construct product image system and realize the consistency of the corporate brand image and product image expression.