【摘要】 针对汽轮机的末级成组长叶片进行了动力学分析,采用固定界面模态综合法对具有局部非线性的高阶方程进行降维处理,并应用此方程数值分析了成组叶片在外激振力作用下的非线性振动响应,采用扭曲梁单元来对阻尼叶片进行建模,建立了叶冠和拉筋处的摩擦力的数学模型,通过Newmark积分法求解动力学的基本方程,分析了不同正压力条件下的响应分布,得出阻尼接触端正压力存在一个最优值,在此值下具有干摩擦阻尼结构的汽轮机成组长叶片减振效果最好。更多还原

【Abstract】 This paper analyzes the dynamic characteristics of the last stage long blades group using the fixed interface modal integration method to decrease the dimension of the high order equation that has partial non-linear components and numerically analyzes the non-linear vibration response of the whole stage blades applied external excitation using this equation.This paper develops the damping blades model by using twisting beam element and develops the mathematic model of the friction existing in integral blade and lacing wire.And then solves the basic dynamic equations using Newmark integration method,analyzes the response distribution in different normal pressure conditions.It can be concluded that there is an optimum normal pressure value at damping interaction ends,and the turbine long blades group that has dry friction damping structure will has a best vibration decreasing effect in this optimum normal pressure.更多还原