【摘要】 基于广义域模态模型提出了一种仅用系统响应输出识别动态载荷的方法。以系统中的其它点作激励点来代替常常为不可达的实际载荷作用点,通过辨识得到系统模态参数并在模态和物理两种坐标下对动态载荷作出估算,从而避免通常对系统修改结构或改变边界条件而导致的识别误差。对该模型的误差传播特性与识别精度分析结果表明该方法能适用于工程实际动载荷测量。更多还原

【Abstract】 Utilizing the response of the system only, a general domain based modalmodel method is presented for force identification. Being excited at the other sites instead of the actual input sites are usually not accessible, while the modal parameters of the system can be identified and the inputs are estimated through calculating under both modal and physical coordinates, thus the errors caused by the usual modification to the structure or the boundary conditions are evitable by means of the method. An analysis of the character for error propagation and the accuracy of the identified force is put forth. The result shows that there is a good consistency between the actual and the estimated input, and implies the method is suitable to the engineering force measurement.更多还原