Applied Mechanics and Materials Vols. 121-126

Abstract: Terminal cutting machine is an automatic device that can realize automatic feeding, bending, cutting the middle carry, shearing. It can be easily integrated with other automatic devices to form a whole production line. In this paper, the cam mechanism is used to realize bending and cutting the middle carry, hydraulic drive structure is used to realize terminal feeding and cutting. A reasonable working time sequence among various processes is necessary to ensure the right working order and avoid the interference. The point of the control is to know which processing step it is by using photoelectric sensors to detect several key positions of the cam. The detecting signal is received by the PLC and hence from there to control all processing steps executed in an ordered and cyclic matter. The timing sequence solution introduced in this paper has been successfully implemented in a terminal cutting machine.

Abstract: According to the requirements and characteristics of air compressor control systems in the process of air separation, an intelligent control method based on the fuzzy PID was proposed. Through simulating the designed control method, it is concluded that the control effect was extraordinarily satisfactory. It can offer a certain meaning of guidance and reference for the control of other equipment in air separation systems.

Abstract: Railway plays an important role in transportation system in China or many other countries. In order to solve the problem of cleaning sand-covered railway in western areas of China emergently, a new railway sand removal vehicle is studying, and as the most important mechanism, the sand scraping mechanism affects entire efficiency and even determines the success or not of the whole vehicle, therefore, structures of the mechanism were designed and further studied by using UG and ANSYS software.

Abstract: Automotive industry is being one of the major supporting forces for the economy of many countries. The requirement of higher standard on safety figure for cars has demanded engineers to design automobile airbag systems with high performance. Since the ignition system is one of the major units in an airbag system, a design of a high-voltage piezoelectric converter which can be implemented in airbag ignition systems is studied in this paper. The selection of the piezoelectric transformer can improve the reliability by increasing the ignition energy. Using the multi-point ignition scheme to measure the orientation of the airbag detonation, the accuracy of the airbag ignition can be improved and the accidental injury caused by collisions can be further reduced. Besides, a good solution to synchronization problems is provided by using multi-point synchronization control and multiple air bags.

Abstract: In consideration of the interchangeability and interoperability of the sensors from different manufacturers, this paper proposes a scheme which can replace the software with the hardware to realize the Network Capable Application Processor (NCAP) in the networked smart sensor node according to the IEEE 1451 standard. Since SST89E564RD is its Microcomputer Control Unit (MCU), the system selects the W3150A chip of hard protocol stack to solve the problem of TCP/IP and make network communication into reality. The drivers of TII, the network interface and the correction engine are designed to meet the demand of NCAP system. The experiments results show that the system is stable and has real time capability.

Abstract: It is important to detect the vehicle rear axle on-line during production process. To realize the quality detection of the rear axle, vibration diagnosis method is adopted to analyze the vibration characteristics of the rear axle and calculate characteristic frequency. The on-line detection control system of vehicle rear axle quality is designed by extracting characteristic parameters of correctly reflecting rear axle running state and applying PLC system. The system has been operated stably, reliably and efficiently through the test. It has a practical significance.

Abstract: The ladle is an important equipment of the metallurgical industry. Distribution of thermomechanical stress in linings has an essential influence on its life, and the size of its life-span influences the economic benefits of the iron and steel enterprise directly. Two-dimensional model of ladle based on law of finite element method is built, and the influence of thermal conductivity, thermal expansion coefficient, elasticity coefficient and thickness of work lining on ladle stress field are discussed. The calculation results indicate that stress increases with the increase of thermal conductivity, thermal expansion coefficient and elasticity coefficient and decrease of thickness.

Abstract: In this study, the design of the mechanism of a recycling system using composite electrochemical and chemical machining for removing the surface layers from silicon wafers of solar cells is studied. The reason for constructing a new engineering technology and developing a clean production approach to perform the removal of surface thin film layers from silicon wafers is to develop a mass production system for recycling defective or discarded silicon wafers of solar cells that can reduce pollution. The goal of the development is to replace the current approach, which uses strong acid and grinding and may cause damage to the physical structure of silicon wafers and cause pollution to the environment, to efficiently meet the requirements of industry for low cost. It can not only perform highly efficient recycling of silicon wafers from discarded solar cells to facilitate the following remelting and crystal pulling process, but can also recycle defective silicon wafers during the fabrication process of solar cells for rework. A small gap width between cathode and workpiece, higher temperature, higher concentration, or higher flow rate of machining fluid corresponds to a higher removal rate for Si3N4 layer and epoxy film. Pulsed direct current can improve the effect of dregs discharge and is advantageous to associate with the fast feed rate of workpiece, but raises the current rating. A higher feed rate of silicon wafers of solar cells combine with enough electric power produces fast machining performance. The electrochemical and chemical machining just needs quite short time to make the Si3N4 layer and epoxy film remove easily and cleanly. An effective and low-cost recycle process for silicon wafers of solar cells is presented.

Abstract: A novel three joints underactuated manipulator has been proposed in this paper. Firstly, the structure features of the manipulator are analyzed. Then, the kinematic model with triangular structure can be converted into the chained form through appropriate design for structural and kinematical parameters. Finally, the result of simulation for three joints underactuated manipulator indicates that the joints angles can be move the desired value by input velocity control of two motors. It is concluded that it is feasible to design controllable manipulator with nonholonomic theory.

Abstract: Ensemble empirical mode decomposition(EEMD) is a newly developed method aimed at eliminating mode mixing present in the original empirical mode decomposition (EMD). To evaluate the performance of this new method, this paper investigates the effect of two parameters pertinent to EEMD: the emotional envelop and the number of emotional ensemble trials. At the same time, the proposed technique has been utilized for four kinds of emotional(angry、happy、sad and neutral) speech signals, and compute the number of each emotional ensemble trials. We obtain an emotional envelope by transforming the IMFe of emotional speech signals, and obtain a new method of emotion recognition according to different emotional envelop and emotional ensemble trials.