振动力学中Duhamel积分应用的思考

CONSIDERATION ABOUT THE USAGE OF THE DUHAMEL INTEGRAL IN VIBRATION MECHANICS

  • 摘要: Duhamel积分也称为卷积积分,通常满足交换律,它给出任意载荷作用下线性动力系统的一般解。本文经过数学和物理分析发现,在分段定义载荷作用时,Duhamel积分不再满足交换律,即使对连续载荷进行分段计算,也不满足交换律。在此基础上,本文明确了正确的分段计算方法。算例验证了所得结论。

     

    Abstract: The Duhamel integral is also called convolution integral and usually satisfies the commutative law. It is used to get the general solution of a linear dynamic system subjected to arbitrary loads. Through mathematical and physical analysis, this paper finds that the Duhamel integral no longer satisfies the commutative law when a system is subjected to segmented loads. Even for continuous loads, the commutative law is either not satisfied when calculating in segments. Based on this finding, the correct segment calculation way is clarified. Examples verify the conclusions.

     

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