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The authors study the secure transmission design in random cognitive radio networks where the primary users, the secondary users and the eavesdroppers are randomly distributed according to Poisson point processes. Centring on this scenario, the authors propose a simple and decentralised secure transmission scheme by jointly incorporating the secrecy guard zone and artificial noise. In particular,...
Taking multiple parameters of the main structural plates thicknesses and loads as random design variables, the strength reliability of bogie frame is analyzed based on response surface optimization approach and JC method. The response surface optimization approach is used to search the failure points of the structure limit state. Meanwhile, the sensitivity of structure reliability is also analyzed...
Degradation, and shock are two common mechanisms accounting for product failures. This paper presents a convenient means of capturing both shock and degradation in a single model when the extent of degradation and the magnitude of shocks are not observable, but only the failure times and the corresponding failure modes are recorded. We assume that the lifetime of a degradation-oriented failure, which...
This paper proposed a new procedure for simulation of random wind velocity field with only a few random variables. The procedure starts with decomposing the random wind velocity field into a product of a stochastic process and a random field, which represent the time property and spatial correlation property of the wind velocity fluctuation respectively. Then the stochastic process for wind velocity...
The stochastic response, stability and reliability of quasi-linear systems subject to multi-time-delayed feedback control and wide-band random excitation are studied by using the stochastic averaging method for quasi Hamiltonian systems. It is verified that the time delay affect the response, the asymptotic stability and the first-passage time greatly, but the deterioration can be almost eliminated...
Although stochastic point process theory has been successfully applied in many fields of knowledge, in power systems reliability it has not received so much attention what is reflected in the low number of reported applications. This may be due to some common misconceptions about the modeling of repairable components which falsely show this method is the same than other popular ones. All these misconceptions...
The neural network response surface method optimized by genetic optimization algorithm has been proposed to calculate the dynamic reliability of stochastic structure with TMD and MTMD, and a contrast analysis of dynamic reliability between them has been processed. The method has both the advantages of neural network response surface method and the global search of GA, which can approach to optimum...
Stochastic analysis of water hammer is greatly needed in hydropower structural reliability design. However, the effect of friction on stochastic analysis of transient flow has been often neglected in previous studies. In this study, a random model of water hammer considering unsteady friction was introduced and moment characteristic method was proposed for numerical calculation. A computational example...
A stochastic nonlinear dynamical model of semi-active suspension system had been presented considering the stochastic factor of the road. The Hamilton function had been described as one dimension diffusion process by using stochastic average method, the backward Kolmogorov equation for reliability function and the conditional moment of the first-passage time and their associated boundary and initial...
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