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在输入信息不完整状态下,为了获得更多输出信息和更加接近工程实际的车辆悬架动力学模型,将未确知理论引入车辆传统悬架振动模型中进行研究。将质量、刚度、阻尼作为未确知量,运用未确知理论、振动状态方程理论、矩阵迭代法建立悬架未确知动力学模型,进而获得动力响应规律。分别将悬架未确知动力学模型研究结果和传统模型计算结果与蒙特卡罗法模拟结果进行比较。结果表明:未确知动力学模型振动位移方差期望值与蒙特卡罗法获得期望值之间的最大差值为0.5385mm~2;未确知动力学模型位移方差期望值与蒙特卡罗法获得期望值之间的相对差值比传统模型位移方差期望值与蒙特卡罗法获得期望值之间的相对差值总体上小0.36%~14.50%。本文结果证明未确知理论的引入可行且未确知动力学模型比传统模型更加优越。
In order to obtain more output information and a vehicle suspension dynamics model that is closer to the actual project, the unascertained theory is introduced into the vibration model of the traditional suspension vehicle in the condition of incomplete input information. Taking the mass, stiffness and damping as the unascertained quantities, an unascertained dynamic model of the suspension is established by using the unascertained theory, the vibration equation of state equation and the matrix iteration method to obtain the dynamic response law. The results of unascertained dynamic model of suspension and the results of traditional model and Monte Carlo simulation are compared respectively. The results show that the maximum difference between the expected value of vibrational displacement of unascertained dynamic model and that obtained by Monte-Carlo method is 0.5385mm ~ 2. The difference between the expected value of displacement kinetic model and Monte Carlo method Relative difference between the expected value of the displacement of the traditional model and the Monte Carlo method to obtain the expected difference between the overall small 0.36% ~ 14.50%. The results of this paper prove that the introduction of unascertained theory is feasible and the unascertained dynamic model is more superior than the traditional model.