薄壁件多点柔性加工的模态分析与振动控制

Modal Analysis and Vibration Control of the Thin-wall Components During the Multipoint Flexible Processing

针对薄壁件多点柔性数控加工中的振动问题进行了研究，建立了薄壁件多点柔性工装系统的有限元模型，据此分析不同厚度、支撑间距情况下固有频率和振型的规律。提出了根据振型叠加曲线确定辅助支撑，抑制振动变形的方法。研究表明：厚度和间距增大时，系统的固有频率增大，1-4阶振型表现为弯曲变形＋扭曲变形。增加2对辅助支撑，既可抑制弯曲变形，又可抑制扭转变形。研究结果为更有效解决柔性工装的优化设计和控制问题提供了必要依据。

This paper studied the vibration during the multi-point flexible processing of thin wall components. The laws concerning the natural frequency and vibration modals under different skin thicknesses and supporting spaces are obtained by establishing the finite element model of the thin wall parts and conducting static nonlinear analysis for deformation with ANSYS. Modal superposition method is proposed to determine the auxiliary supports and refrain the vibration. The results show that the natural frequency increases as the thickness and support distance increase; the first four vibration modals appear in forms of bending and twisting. The addition of two pairs of auxiliary supports can refrain both bending and twisting deformations. The result is useful for optimal design and effective control of flexible processing equipments.