动态载荷位置识别当量载荷误差判别法

The Equivalent Load Error Method of Dynamic Load Position Determination

根据线弹性系统的振动特性,采用动载荷识别频域法研究动载荷作用位置识别问题。提出了当量载荷误差判别法,用不同测点响应在相同位置反演出来的当量载荷的误差值建立目标函数,当量载荷误差最小的作用位置就是动载荷的真实作用位置。从单点激励和两点激励方面进行了平面板的载荷位置识别仿真,在加入噪声的情况下效果依然理想,为复杂结构和多个加载位置动载荷识别提供基础。简支梁实验结果表明,该方法能正确识别载荷作用位置,对噪声不敏感,有很好的工程应用前景。

To provide a real loading environment for structural design,product life estimation and health assessment,it is important to correctly identify the dynamic load and its position.In this paper,the fre-quency domain method is used to study dynamic load position determination,and an equivalent load error method based on the vibration characteristic of the linear elastic system is proposed.This method constructs an object function with equivalent load error values at the same location from different measuring points.The actual position is where the equivalent load error is the smallest.Simulation on the tablet is perfect with both single point drive and double points one,and the method is still valid when noise is added.It provides the basis for complex structures and the determination of multiple loading locations.The experimental verification on a simply supported beam shows that this method can correctly identify the dynamic load location,is not sensitive to noise,and has good prospects for engineering applications.