【摘要】 本文建立了液压起升机构的含有刚度慢变参数的非线性多自由度动力学模型，并用模态分析和ＫＢＭ方法得到了系统非线性方程的一次及改进的一次近似解。作为比较，又采用数值方法求得系统方程的数值解。分析了液压系统的动态特性，为起升机构的设计提供理论依据。更多还原

【Abstract】 This paper sets up a nonlinear multi degree of freedom dynamic model of hydraulic hoisting mechanism with slowly varying stiffness.The approximate solutions of nonlinear equations of system are obtained with the method of mode analysis and KMB.For comparison,the equations are also solved by numerieal method.The result of study provides a theoretical basis for hoisting mechanism.更多还原