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This paper presents a method using Colored Time Hierarchical Petri Nets (CTHPN) that synthesizes stochastic Petri Nets (SPNs), colored Petri Nets (CPN) and hierarchical system modeling methods. A detailed procedure of dynamic reliability modeling of a complex mechanical system is addressed. It demonstrates CTHPN's capability of describing complex dynamic interaction among various factors affecting...
Concerning the issue of high-dimensions and low-failure probabilities including implicit and highly nonlinear limit state function, reliability analysis based on the directional importance sampling in combination with the radial basis function (RBF) neural network is used, and the RBF neural network based on first-order reliability method (FORM) is to approximate the unknown implicit limit state functions...
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...
Technology is constantly improving, thus aircraft systems are becoming highly-integrated and more complex. These systems are safety-critical and consequently must be carefully designed, analyzed and evaluated. In order to overcome this complexity increase in aircraft systems, this paper puts forward reliability and safety assessment techniques and methods based on the use of formal design language...
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,...
For the repeated docking of structure latches which lead to the fault mechanism of the fretting wear, it is established the model for the fretting wear fault mechanism of latches. Then the main parameters which have influence on the fretting wear are determined through the analysis of structure kinematics simulation. On this basis, for the nolinear and implicit limit state function, comprehensively...
The motion of main rotor head of helicopter rotor system is complex. Its reliability influences flying qualities and safety of helicopter directly. But, traditional experiments and deterministic simulation have been difficult to measure movement (flapping, lead-laging and pitching angles) and analyze motion reliability of main rotor head quantitatively. The virtual prototype model was built in the...
The pusherchain transmission is the core of shearing device, which occurred to the failure of getting stuck resulted in the chain-axis deformation. First, the paper presents the analysis of FMEA, FTA for deformation failure, and carries out the simulation research for failure analysis on wear-failure for chain plate. Then, based on the random effects of significant geometry, material properties, transmission...
The deployment principium of a large hoop-truss satellite antenna is studied and the mechanical analysis model and the non-probabilistic reliability model of its deployment mechanism are presented. Synthetically considering the effect of dimension errors and the space environment factors, we treat the mechanism movement as a function of some interval variables, and derive the reliability formula by...
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