| Random vibration source exists in nature and engineering,these random vibration source could have different level of influence on engineering structures,such as aircraft buffeting induced by atmospheric turbulence,acoustic fatigue induced by jet noise on surface structure of aircraft,reliability of launch vehicle under payload of rocket propulsion The same point of these problems is randomness of excitation.So,it's important to study the response of engineering structure under random excitation.Bolt flanged connection is a typical one of engineering structures.But the studies on response of bolt flanged connection mainly focus on static analysis and impact analysis.Therefore,this paper focus on random response analysis of bolt flanged connection structure under random excitation.There're five parts included in as follows:Firstly,a review of development of stochastic dynamics and methods of random vibration is presented,some kinds of random excitation,Monte-Carlo simulation and stochastic averaging method are introduced.Secondly,random response of Yar-Hammond bilinear hysteretic system under non-Gaussian excitation is studied by using Monte-Carlo simulation.Based on hysteretic equation,relationship of hysteretic force and displacement is obtained.Discussion on the difference of random response under different parameters is completed.Thirdly,random response of vibro-impact system with Bouc-Wen hysteresis under Poisson white noise excitation is studied.By using stochastic averaging method and perturbation method,the averaged generalized FPK equation is obtained and solved..Fourthly,a bolt flanged connection structure with hysteretic buffer under vertical excitation of Gaussian white noise is studied.Difference of response is discussed for different values of system parameters.Finally,study on random response of bolt flanged connection with hysteretic buffer under horizontal excitation of Poisson white noise and bounded noise is proposed. |
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