半车非线性悬架的非平稳随机振动及控制

NON-STATIONARY RANDOM VIBRATION AND OPTIMAL ACTIVE CONTROL OF A HALF-CAR NONLINEAR SUSPENSION

研究了1/2车非线性悬架模型在路面随机激励下的非平稳振动响应,并基于随机最优控制理论对其进行主动控制.首先利用等效线性化方法将具有非线性阻尼及迟滞刚度的非线性悬架模型线性化,然后将主动、被动悬架非平稳随机响应进行比较,结果表明非线性主动悬架的性能要优于被动悬架.最后,通过Monte-Carlo数值模拟验证了理论结果.

This paper studied the non stationary stochastic response and the optimal control of a half car dynamical model with nonlinear active suspension under the excitation of random road surface. Using the method of equivalent linearization, the response statistics and stochastic optimal control of the nonlinear suspension were obtained. The comparison and analysis of the non stationary response of active and passive suspension show that the nonlinear active suspension is better than the passive suspension. Finally, the accuracy of the equivalent linearization technique was verified by Monte Carlo simulation.