Applied Mechanics and Materials Vols. 651-653

Abstract: Six degrees of freedom motion platform is an important part of the flight simulator. To study the dynamic characteristics of the simulator, the paper carried a six degree of freedom motion platform dynamics analysis, and proposed fuzzy PID control strategy, and through the ADAMS software to establish a simulation model of six degrees of freedom motion platform, simulation results show that the use of strategy has good control effect for the simulator is designed to provide some reference.

Abstract: This article mainly discusses the mechanism of electrical erosion and the macro and micro appearance of electrical erosion failure tooth surface. By observing the similarity of the two groups of tooth surface morphology, we can determine the possibility of gear electrical erosion failure. Through the calculation of gear contact strength and anti scuffing ability, we can rule out the possibility of tooth scuffing and pitting. So we can identify that the failure form of gear is electrical erosion .Finally, according to the calculation of the content, we get some conclusions.

Abstract: By means of the fountain-convergence analysis method of FRRU (Flow Resistance-Rigidity Uniformity) index defined by the author, evidential comparison analysis study has been made to the relationship between flexible drift of flow performance of WTD (Weight Type Distributor) valves of fuel nozzles of X engine and hot-end failures of X engine. The results show that during the initial period of engine start, because of the relative scarcity of air in the combustor, a convergence characteristic, due to its converging flow property of multiple to one, can lead to such hot-end failures as turbine blade fusion break which is characterized by abrupt change, while a fountain characteristic, due to its diffusing flow property of one to multiple, cannot result in any hot-end failures.

Abstract: For the conclusions of single parameter fault feature diagnosis has some uncertainty, in induction motor early fault, we proposed the use of multi-sensor data fusion technology, acted signal processing to the collected current, vibration and temperature, extracted feature information failure, fused the evidence independent with each other using D-S evidence fusion rules. According to the final combination results of all the evidence, combined with intermediate results of the evidence combination, we achieved the accurate identification of induction motor rotor early failures and composite fault. The diagnosis examples show that the use of multi-sensor data fusion technology can significantly improve the accuracy and reliability of early fault diagnosis.

Abstract: This paper studied the sub-frame of car. To optimize the design of the sub-frame of car, the finite element analysis was applied to the sub-frame.Through the static analysis, it found that the yield maximum stress is greater than the vice stress of frame material. The result showed that the static strength of sub-frame met the requirements.The rationality of the design of the side frame was verified. The twelve order modal parameters of sub-frame were analyzed.

Abstract: In order to select the best design method for stay bolts in the diesel engine assembling process, main fixed parts of some MAN low-speed marine diesel engine were analyzed based on finite element analysis software Hyperworks. The mechanical performance of bottom, frame and cylinder under the effect of the four kinds of assembling methods was investigated. Ultimately, the best assembling process was confirmed. Results indicated that the finite element analysis model was reliable and exactly. The middle to both sides assembly was the best among the four methods.

Abstract: Hydraulic resistance coefficient (HRC) is a fundamental parameter that characterizes the hydraulic state of a water pipeline and significantly determines the efficiency of the water-transport process. To estimate HRC and diagnose hydraulic process fault in building air conditioning system, a novel method called multi-objective optimization (MBO) strategy was developed in the research effort. MBO is concerned with mathematical optimization problems involving more than one objective function to be optimized simultaneously. In this paper, first, the basic principle of the approach is presented. Then several experiments are conducted to identify the HRC in a real air conditioning system. And the water flow rate of each air handling terminal unit is estimated by the flow rate of primary pipe and identified HRC. The experiment results show that the model can accurately estimate HRCs. The HRCs of each pipe and terminal unit were obtained by the flow rate and the pressure difference of primary pipe without requiring geometric specifications, which is very convenient in real engineering application.

Abstract: Neural networks application in helicopter reliability researching is introduced in this paper. Because of high cost and long collected time, the collecting of helicopter reliability data is difficult, so it is difficult to establish the reliability data distribution model, predict the reliability and allocate the reliability of helicopter. By using the neural networks, the reliability data of helicopter is extended. The reliability data distribution model can be established, the reliability prediction can also be done accurately. It is proved by the instance that the reliability prediction accuracy is improved 98.4% by using the fuzzy neural networks. The application of neural networks has a good reference to helicopter reliability researching.

Abstract: This paper develops a high-sideslip flight control scheme based on model reference adaptive control (MRAC) to stabilize aircraft under aileron deadlock of one side. Firstly, the cascaded flight control scheme for high-sideslip straight flight is presented and how the control signals transfer is also analyzed. After that, the control structure and laws of MRAC for attitude inner-loop connected with sideslip command are designed. Finally, the control scheme is verified under a nonlinear aircraft model in conditions of no fault and one side aileron deadlock respectively. The simulation results show that when one side aileron deadlock occurs in accompany with the plant’s aerodynamic data perturbation and random initialization of controller parameters, this control method could utilize operation points of no-fault aircraft to force the faulty aircraft following the given reference model responses and finally tracking given sideslip angle command without static error robustly.

Abstract: By applying the technology of FPGA to solve the problem which derives from various Internet interruption of safety on management about controlling system of digital ATM(Automatic Teller Machine), specifically analyze the basic withdrawing function of ATM. According to the fundamental method of withdrawing, starting from the procedure of designing circuits, then focus on research about the principle to manage ancillary equipment and following LED circuits by means of applying FPGA which use the essential hardware language Verilog to accomplish this mission on the interface of software Xilinx ISE, then after simulation and finally download the source code to Basys2 to verify the accuracy of withdrawing function. In all, it's an innovative design of withdrawing function of ATM based on FPGA board and hence ensure the absolutely safety of customers' individual information in ATM.