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提出了一种结构动力特性修改的新方法,通过在原结构上附加质量与刚度来重新设定结构固有频率,以满足结构设计的动力特性要求。该方法在交叉模型交叉模态(CMCM)模型修正方法基础上进行了改进,仅利用目标频率信息来确定结构质量和刚度的附加量。数值算例采用了一个5自由度的弹簧质量系统,进行了设定结构单阶及多阶固有频率多种工况的计算。数值结果表明:修改后结构的固有频率可以满足给定的频率要求。
A new method to modify the dynamic characteristics of the structure is proposed. The inherent frequency of the structure is reset by adding mass and stiffness to the original structure to meet the dynamic characteristics of the structural design. The method is improved based on the cross-mode cross-modal (CMCM) model correction method. Only the target frequency information is used to determine the additional mass and stiffness of the structure. The numerical example uses a spring-mass system with 5 degrees of freedom to calculate the various operating conditions for the single and multiple natural frequencies of the structure. The numerical results show that the natural frequency of the modified structure can meet the given frequency requirements.