等效刚度法在车体垂向振动频率计算中的应用研究 Application of Equivalent Stiffness in Vertical Vibration Frequency of Car Body

Abstract

本文采用等效刚度法，将铁道车辆车体这种复杂结构等效为等截面梁；应用弯曲变形能相等的原理，结合车体特征，并引入了相关修正系数，得到了车体的等效惯性矩Ie。以铁木辛柯梁的振动频率计算公式为依据，并在长度方向上对车体的面积及剪切形状系数进行了修正，得到了最终的计算公式。将简单车体及某型高速车体的参数代入公式，并将计算得到的结果与有限元结果进行了对比，证明了计算方法的可靠性，为车体垂弯频率的计算提供一种参考计算方法。 The railway vehicle car-body can be equivalent to the uniform beam with a method of equivalent stiffness. Equivalent inertia moment Ie can be calculated with bending strain energy equality the-ory and a related coefficient according to car-body structure. With the Timoshenko beam theory and some models, a final formula is obtained. A simple car-body model and a high-speed car-body model are calculated with above method, and there are acceptable errors between analytical and finite element results, which is a reference method for car-body design.