Applied Mechanics and Materials Vol. 697

Abstract: A 2-D axisymmetric mathematical model base on Fourier’s equation and Fick’s law was developed to simulate coupled heat and mass transfer during convection cooking of chicken patties. The food physical properties were functions of local values of temperature and moisture content. The model equations has been solved by a commercial FEM package, called COMSOL Multiphysics. Transient temperature and moisture distributions inside the product were predicted, and a comparison between the theoretical predictions and experimental results reported in the literature has shown a good agreement. The developed model can be used to predict the cooking process.

Abstract: The primary goal of this study is to optimize the dynamic axial magnetic field distribution in magnetron sputtering system, guiding the target ions to project directly to the substrate. A group of electromagnetic coils were set up to generate an auxiliary axial magnetic field. The configuration of axial magnetic field in different electrifying modes on coils were simulated using numerical integration. Based on the general theoretical results, this paper proposed an optimization of coil arrangement and electrifying modes for a C-shape direct current(DC) magnetron. A 3D model of the coils was set up and the finite element analysis results verified the accuracy of theoretical results. Consequently, this study proposed an arrangement and electrified scheme of electromagnetic coils to provide a dynamic auxiliary axial magnetic field, which could match with the shape and movement of the primary magnetron.

Abstract: Recently, intelligent bus system has been applied progressively in Medium-sized cities to solve the problems of traffic jam. The control terminal on bus, an important composition of Intelligent Bus System, is introduced in this paper. It adopt at91sam9260 as the core chip, connected GPS module and GPRS module by 232 serials port to realize bus stop Announcement, bus location, and data transmission. Through this device, efficiency is improved and traffic pressure is relieved.

Abstract: In this paper, a king of Bearing mounting machine for gear box bearing was developed because of much problem in the manual assembly. The control system of the push mounting machine based on the Mitsubishi PLC was expatiated. The real time displacement and the pressure can be displayed with the help of Delta touch panel, and also the real time curvilinear of the key parameter.

Abstract: In this paper, a new sensorless speed control strategy which is based on a new sliding-mode observer (SMO) is proposed for permanent-magnet synchronous motor (PMSM). The rotor position is estimated by the back electromotive force (EMF). In order to improve the estimation accuracy, the speed estimator is proposed, which replace the method of direct differential. The Lyapunov theory is applied to prove the stability of the designed system. The simulation results indicate that the proposed sensorless speed control system of permanent-magnet synchronous motor based on a new sliding-mode observer is effective and feasible.

Abstract: The skid-steering vehicle is able to be steered by the speed difference of the inside and outside wheels created by controlling the torque distribution of all drive wheels. The three degree of freedom dynamic equations are established for electric ground vehicle with six in-wheeled motors, based on which the drag force calculation model is presented under steady skid-steering condition. Then the variation of resistance torque with the steer input and vehicle velocity is analyzed including its theoretic constraint limit. The steering resistance moment of the electric ground vehicle is compared with that of the tracked vehicle with the same vehicle parameters. In order to validate the calculation results, the virtual prototype model is created and the dynamic simulation is executed in ADAMS software. The results indicate that the resistance moment of electric ground vehicle is more than that of the tracked vehicle with same configurations and the computational model is correct.

Abstract: This paper discussed the sensor multi point monitoring method is through to more sensors to collect information monitoring to achieve urban underground long tunnel of real-time monitoring, can reduce energy consumption, and to establish a set of intelligent monitoring and diagnosis technology of health, it can be realized in the state of the health of the tunnel automatic alarm, the automatic alarm equipment failure, equipment performance condition to be automatic forecast, to ensure the healthy operation of tunnel long time.

Abstract: For the field data of 10 sets of machining center from Shiyan Yixing Industrial Development Co., Ltd. application of statistical methods, the typical domestic machining centers are conducted a comprehensive analysis of reliability. By applying fault frequency and fault proportion primary-and-secondary Diagram, the fault parts and priority are classified and solved.

Abstract: This paper introduces the system structure of neural network in fault diagnosis, and summarizes some applications of neural network in fault diagnosis. The most commonly used neural network in fault diagnosis is BP network. The second is RBF network and the third is ART. For each neural network, the paper will discuss the neural network, and the introduce some applications. It also introduces the combination of neural networks and other techniques. In the last part, this paper points out the development trend of the neural network in fault diagnosis.

Abstract: A miniaturized circularly polarized (CP) antenna for ultra-high frequency (UHF) radio-frequency identification (RFID) reader is designed in the present paper. For the aim of miniaturizing antenna, the square radiating patch is opened by four T-shape slots. This can extend the route of surface current, as a result the operating frequency drops and the size reduces. In additional two diagonal corners of the radiation patch are truncated by a square to achieve CP operation. The designed antenna is calculated and optimized by HFSS. The optimized antenna exhibits satisfied performances, and is therefore suitable for UHF RFID reader applications. The designed antenna shows the advantages of small size, simple structure, and low cost.