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Complex electromechanical systems considering performance degradation are multi-state systems which cannot be described by traditional reliability theories based on the binary states assumption. Generally, such systems contain both electronic and mechanical components that have different failure mechanism and characteristics. In addition, states of the system and its components are time-variant, which...
In precision ultrasonic process, the amplitude of the transducer will change while the load changes. which causes the unstable process and the decline of the process quality and efficiency. To solve these problems, the theoretical model of controlling ultrasonic amplitude output is established by feedbacked current. The theory is based on Kirchhoff's circuit laws. And then a method of constant amplitude...
According to the deficiency that traditional reliability and safety analysis approach cannot describe dynamic behaviors of complex system, priority of failure events, and failure mode propagation. A new safety analysis and assessment technique is studied. It is based on the finite state machine theory and use the formal specification language AltaRica for system modeling. Because it puts event as...
According to the high nonlinear and strong correlation characteristics of limit state function for structural reliability analysis, and the defects of low efficiency and long computational time of classical Monte-Carlo simulation sampling Bayesian Monte Carlo Adaptive Importance Sampling method (BMCAIS) is introduced in this paper. Considering MCAIS needs initial important sampling density function,...
The objective of this study was to introduce a new high-performance diameter distribution function. The long-term repeated measurement data sets, consisted of 150 diameter frequency distributions from Chinese fir (Cunninghamia lanceolata) plantations in the southern China, were used. R distribution had presented a more accurate simulation than three-parametric Weibull function. The parameters p, q...
A vehicle simulation model for Dual Clutch Transmission (DCT) is designed in Matlab/Simulink, and more importantly, an objective description of the method to evaluate its shift quality based on neural network (NN) is implemented. The objective evaluation method adopted the theory of NN prediction; NN is trained and tested with sample vectors comprised by shift quality evaluation index, subjective...
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