Advanced Materials Research Vol. 662

Abstract: Through the comparison of many monitoring system’s schemes, the bus way of monitoring system was select which is based on CAN bus, using the PCI-5110 CAN interface card which is produced by ZHOU Li-gong company as the CAN node, selecting the CAN485MB intelligent protocol converters as their communication bridge between the CAN interface card and AI instrument. The system adopts the OPC technology to realize the communication between Kingview and CAN bus and builds a monitoring system based on CAN bus network to realize the function of the process control experiment platform of the real-time monitoring and graphical interface. Having friendly MMI, good flexibility, the whole system is worth to popularize and publicity.

Abstract: As an inertial sensors assembly, the FOG inertial measurement unit (FIMU) must be calibrated before being used. The paper presents a one-time systematic IMU calibration method only using two-axis low precision turntable. First, the detail error model of inertial sensors using defined body frame is established. Then, only velocity taken as observation, system 33 state equation is established including the lever arm effects and nonlinear terms of scale factor error. The turntable experiments verify that the method can identify all the error coefficients of FIMU on low-precision two-axis turntable, after calibration the accuracy of navigation is improved.

Abstract: A research on the vibration and acoustic radiation of stiffened finite cylindrical shells in water under a multiple axial-excitations driven was presented. The vibro-acoustic coupling equations of shell under multiple axial-excitations based on Flügge thin shell theory were established. The displacements, surface acoustic pressure and stiffener impedances were expressed in terms of the numbers of normal modals and modes, and considering multiple excitations, the forces were expressed in terms of the numbers of normal modals and modes. Then analytical solution was derived for the vibration and sound radiation from the stiffened shell under multiple excitations. Based on the analytical solution, the influences of excitations’ positions to the vibration and acoustic radiation were investigated. The results show that for double excitations, at high frequencies, the distance between excitations was more large, the average velocity was more low. The results could be used to control the underwater vehicle’s vibration and acoustic radiation.

Abstract: Currently Least Squares Method (LSM) is commonly applied in the error evaluation, but it is adaptive to the condition of low accuracy requirement. Besides, the error value obtained by LSM is not the minimum. In order to accurately evaluate parallelism error, the minimum zone mathematical model of the parallelism is given based on the new generation geometrical product specification and verifications (GPS). According to the characteristics of parallelism error evaluation, a new adaptive Particle Swarm Optimization algorithm with dynamical inertia weight (DCWPSO) is proposed to solve target optimization problems of the error evaluation. Finally we use the measurement of a line to plane parallelism error evaluation as an example to validate the proposed method. The experiment results show the feasibility and availability of the method．

Abstract: In the DC power system of the unwatched transformer substation, the battery charger is one of the key devices. The stability of its performances directly affect the stability of DC power system. In the paper, using the computer technologies and the real-time Ethernet technology to communicate with the battery charger monitor to achieve remote monitoring technology of the performances of the battery charger. It can not only remote monitor the operations and fault states of the battery charger on line, but also remote sensing the ripple factor and the stabilized voltage precision when the battery charger is under the states of the floating charge and the constant voltage equalizing charge, at the same time remote sensing the stabilized current precisions when the battery charger is under the stage of constant current equalizing charge, and the characteristics of equalizing current when the battery charger is in operation. So the remote monitoring technology of the performances of the battery charger is very important in the transformer substation.

Abstract: The detection method of automotive controller area network bus is studied in this paper. The composition of detection system is introduced. By analyzing and processing the data of CAN bus and sensors, work condition of automotive is achieved. Multi-pattern data fusion model and algorithm for failure diagnosis is researched. The detection system designed in this paper can be applied to automotive fault analysis, troubleshooting and maintenance.

Abstract: In order to make the best of abundant fault transient information, a neural network fault detecting method based on transient information is proposed. Firstly, a appropriate orthogonal wavelets packet function is chosen in order to effectively distill fault transient information; and then a chaotic neural network is employed to detect SPGFs, by which the interference of false and non- fault transient information is overcome, its weight coefficient and parameters are optimized by improved genetic algorithm; Finally, a numerical type of fault detecting criterion is designed. Effectiveness and advantage of the proposed method is tested by several experiments.

Abstract: In this work, GMR multilayer films are deposited and then processed into GMR sensors. The transfer curves of GMR sensor are acquired by sweeping the signal magnetic field in different directions. In addition, the rotation behavior is measured by rotating a magnitude-fixed field around the sensing axis. The results are analyzed and it’s found that the angular dependence of GMR sensor can be characteristic with cosine function.

Abstract: The existing energy use for real-time monitoring, to the statistical data of system analysis, main factors determining energy consumption, through the computer, mobile phone, PDA and other port monitoring display. According to the specific energy consumption situation in the development of targeted energy-saving plan, adopt infrared intelligent switch, air conditioning control, efficient lighting, infrared remote sensing switches and other measures to achieve energy-saving emission reduction demonstration effect.

Abstract: A capacitive sensing system for measuring spindle roundness was proposed in this paper, it was different with the past method using inductive sensors and laser displacement sensors. Three capacitive displacement probes were installed circularly on the measured shaft, because of capacitive sensor with average effect in two electrode plates, it is able to overcome the affect of microscopic factors. while the shaft was rotating with a certain speed, the probes measured the shaft’s profile in non-contact mode simultaneously, then through linear combination for three output signals, the spindle error of the rotating shaft was eliminated, and the roundness error was effectively separated from the measurement results. The experiment results have verified the effectiveness of roundness error measuring system based on mutiple capacitive probes, this capacitive sensing system can be used for rotating shaft roundness measurement.