Applied Mechanics and Materials Vols. 347-350

Abstract: In order to realize complex seam tracking accurately in the process of laser welding, a system for measuring joint seam was constructed by means of vision sensor. The system gives the method of measuring and calculating the center line, width, and normal vector. It also gives the transformation between measurement coordinate system to the camera coordinate system and the plan of the torch path. Tracking experiment of complex seam was done and shows that this tracking control system of complex seam in laser welding based on visual measurement is able to meet the requirements about tracking control of 3-D laser welding.

Abstract: Noise is one of the common faults in hydraulic system. The correct analysis and deal with the noise will make for the normal operation and optimization of the system. In view of the noise of a new self-propelled transporter suspension hydraulic system produced in the debugging process of the heavy load lifting when suspension falling, by means of mechanism analysis, modeling and simulation analysis of the suspension hydraulic system, finding out the noise comes from the hydraulic component of system with SV type pilot check valve; The noise fault is caused by the improper circuit design of hydraulic system, the feasibility of the using the SL type pilot check valve to eliminate suspension hydraulic system noise proved by the simulation analysis, in the field test of the improved suspension hydraulic system, the suspension falling gentle and noise elimination, which shows that the analysis and simulation model is correct; Through the comparison and analysis on the SV type and SL type kinds of pilot check valve on the reasonable application in the hydraulic circuit isolation, that provides a theoretical basis for the correct selection two kinds of pilot check valve.

Abstract: A mobile self-reconfigurable microrobot actuated by MEMS-based electromagnetic micromotors is presented. Normal stepping control methods for electromagnetic micromotor are introduced. To improve the locomotion accuracy of the microrobot and the efficiency of automatic docking between them more, a Changeable Virtual Winding Method (CVWM) for high-accuracy microstepping control is developed. Experimental results demonstrate the feasibility of the concept.

Abstract: The indirect vector control scheme is machine parameter dependent. And parameter identification schemes are themselves dependent on some motor parameters. This paper analyzes parameter sensitivities of two identification methods, reactive power model and q-axis flux model based on MRAS are analyzed through extensive simulations and experiments on an induction motor. Then a novel scheme is proposed based on hybrid model by combining the two adaptive models. The results demonstrate that the hybrid scheme is almost parameter independent in different operation conditions. And it is considered useful in practical application.

Abstract: This paper describes a Human-Machine interface for rudder control system based on WinCC. This interface contains the dynamic monitoring screen for rudder control system, and it can communicate with PLC and WinCC. The Human-Machine Interface has an overview schematic of steering system, and there are five sub-screens in the overview schematic including Unit screen, Measure screen, Alarm screen, Trend screen and Table screen. The display patterns of data are virtual dashboard and curves, and it can be recoded, saved and printed. The system achieves the communication between PLC and WinCC by using OPC. Experiments demonstrated that setting up a monitoring platform for industrial production achieve a visual monitoring, data acquisition and display effectively.

Abstract: ressure regulators are very important elements in pneumatic systems. Purely mechanical pressure regulators are commonly used to control the supply pressure to the desired value. The intelligent pneumatic pressure regulator (IPPR) is designed as the demands of pressure control precision increase. Its prominent advantage is the ability to achieve accurate output pressure, remote control and centralized management. In this paper, the IPPR consists of a mechanical valve body, a stepping motor, a microcontroller, a pressure sensor. Herein, its pneumatic characteristics were analyzed, and the pressure control algorithm was presented. The superior performance of IPPR was shown in AMEsim simulation, especially in terms of avoiding affects from upstream pressure and downstream flow disturbances.

Abstract: Recently silicon components have been applied in mechanical watch movements. Among them, the silicon hairspring is the most attractive due to the significant improvement of accuracy and performance compared with the traditional material. However, the current device in production is unable to measure the spring constant which determines the timekeeping accuracy of the watch. This paper presents a method to measure the spring constant of silicon components. The setup is based on Variocouple with a force sensor. The data processing is realized by Matlab. The result shows that the spring constant is calculated rapidly and accurately.

Abstract: The real-time seed-metering device performance detection is one of key techniques to ensure operation quality of a planter. A crossed E-shape plate capacitance sensor, a parallel-plate capacitance sensor and a differential tri-plate capacitance sensor, are proposed to test corn-seed flow. The detection concept and sensor structure parameters are presented. An adjustable stand is designed to investigate the impact of sensor structure and seed velocity on the outputs of capacitance sensors. The sensitivity and the feasibility of 3 sensors are studied by detecting capacitance variations at different corn-seed speeds. Experimental results show that, with average capacitance variation 0.1245pF and 0.1115 pF, respectively, the crossed E-shape plate sensor and the differential tri-plate sensor are suitable to measure corn-seed metering device performance.

Abstract: In recent years, the western countries for the implementation of emission reduction goals, all carried out low sulphur or zero sulfur fuel. For the implementation of low sulphur fuel standard implement, government agencies designated third party supervise, monitor, and submit the test report system, for sales unqualified fuel enterprise impose high fines or imprisonment. To ensure the market sales of more than 95% fuel to low sulphur standard. These management measures on our car fuel market standards and management of great significance.

Abstract: Hardware circuit design process with the motion control system of the traverse robot was described, including the motor drive module and the feedback module with location information. A large number of experiments showed that the modules could be well applied to the platform of the traverse robot.