Advanced Materials Research Vols. 383-390

Abstract: This paper made a detailed analysis to calculate equivalent rotation vector of vehicle in untypical conic motion, and put forward a method to imitate the real motion of vehicle. The paper first studied comprehensively the influence on vehicle information such as attitude angle, speed, position, etc, calculated by angle-increment attitude algorithm with different samples in untypical conic motion. The general result is figured out. And this paper provided reference for choosing attitude algorithm in practical projects.

Abstract: In this paper, a micro three-dimensional wireless power receiving coil is designed and powered by a set up wireless energy transmission system. Energy receiving performances of the receiving coil is studied. By experiments, coupling coefficients between the transmitting coil and each winding of the receiving coil are caculated at different attitudes. The experimental results confirm that the receiving coil can receive energy from three orientations and three orthometric windings can compensate each other effectively at different attitudes. Then a micro rectifier and regulator circuit are designed and fabricated which is used for a self-made camera system. Based on this, the actual output voltage is measured. The experimental results verify that the efficiency and stability of the three-dimensional receiving system can meet practical application.

Abstract: It requires high security for useing silane decomposition reaction to produce the polycrystalline silicon. For this reason, the paper introduces the central facilities of the polycrystalline silicon production, and bases on production process, to devise a control system which combines PLC and industrial ethernet technology. The system controls temperature and pressure of the decomposition furnace, cooling water system, and production process. The practical result showes that the system is reliable and steady. It meets the requirements of process.

Abstract: In this paper, the principle and method of active vibration control of a flexible cantilever beam with PZT actuators was studied. A strategy of active control on the first and second order vibration mode of the flexible cantilever beam are determined and implemented by using the independent modal control. Eexperimental results show that the structural damping of the flexible cantilever beam is improved effectively and excellent effect of vibration suppression is achieved with the control strategy.

Abstract: The composition and working principle of electric hydraulic servo control system are briefly described. A program is designed about digital servo controller based on DSP structure, and the servo system is achieved to control position by using TMS320LF2407A’s powerful digital processing capabilities, rich peripheral interfaces and optimal control algorithm of deviation, meanwhile it also has complete self-testing, setting parameters online and other functions. It is shown that the digital servo controller runs reliably, achieves real-time and precise control effect, and can meet the TRT and other systems’ control requirements with the experimental results.

Abstract: Cracks that occurred in the top slab of a cantilever construction bridge were investigated through field test, which revealed that the cracks were caused by excessive prestress layout and too small curvature radius of tendons. The excessive prestress layout can reduce the forced area of cross-section. Too small curvature radius of tendons may cause the concrete in the flat curve of tendons to withstand great radial component of forces. And, excessive prestressed ducts will in a certain extent affect the quality of concrete between the ducts. In addition, a finite element analysis was performed to evaluate the effects of the tendons. Based on the results, a construction method that prevents the cracks is proposed.

Abstract: In this paper, a novel speed-sensorless suspension decoupling control strategy for bearingless motor was proposed based on linear Extended State Observer (ESO). In the proposed control strategy, a second-order and a third-order linear-ESO algorithm were added respectively into torque d-q axis current-loop and suspension system x-y direction displacement-loop. A product of electrical angular speed and torque system d-q axis current and a product of torque q axis flux and suspension system d-q axis current were defined as disturbances in order to use the linear-ESO algorithm to estimate the defined disturbances. By obtaining speed information and compensation for disturbance force, the motor can work on speed-sensorless condition and traditional decoupling algorithm can be simplified. The simulation results show that the proposed control strategy can realize accurate speed estimation and guarantee stable suspension under the rated speed.

Abstract: This paper discusses a Web-based remote radar fault diagnosis and information system . A delicated radar network is set up with knowledge base and Web . The various key points about the structure , the function module and the key technology of the remote diagnosis system are analyzed and developed . In this way the real-time monition and automatical fault and diagnosis are realized , the reliability of the radar and the emergency repairing ability is improved .

Abstract: A turn rate estimation based adaptive interactive multiple model algorithm is put forward to solve model-set mismatch problem of target tracking algorithm applying to high maneuvering target. By considering both the estimation and the estimated variance of target’s turn rate, model-set is selected according to a rule based on the coefficient of variance of turn rate estimation. When turn rate estimation is acceptable, model-set is constructed according to turn rate estimation to reduce competition among models. When turn rate estimation is unacceptable, standard IMM algorithm model-set is applied to increase coverage of model-set. Simulation shows this algorithm improves tracking performance especially for high maneuvering targets.

Abstract: Electromagnetic environment (EME) in helicopter cabin is one of the most important indexes for electromagnetic compatibility (EMC) on airborne platform. The simulation results were not accurate enough because of the difficulties in accurately modeling and the large computation. Due to the inaccuracy of the former modeling method which used the typical geometric, the professional software ICEMCFD/AI*Environment (AIE) was employed to restore the helicopter’s original model, based on the obtain of the accurate helicopter model, the Multi-layer Fast Multipole Method (MLFMM) and Combined Field Integral Equation (CFIE) were employed to analyze the variation of the electric field in the helicopter cabin versus the frequency and other factors with a VHF antenna mounted on the helicopter. Both accuracy and computing speed were concerned, the results have some guidance significance to the EMC preliminary design on airborne platform.