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改进了基于互相关函数的损伤检测方法,不需要定义参考点就可以对复合材料梁结构的损伤进行定位。首先采集完好结构各测点的两组加速度响应,一组作为参考响应,另一组作为其特征响应;当结构发生损伤后,采集损伤结构各测点加速度响应作为其特征响应,分别计算完好结构及损伤结构的特征响应与参考响应间的互相关函数;以各测点响应互相关函数最大值在结构完好与损伤之间的相对变化作为损伤指标,对不同测点间的损伤指标进行差分处理,获得相应的损伤定位指标以定位损伤。针对蜂窝夹层复合材料梁单位置损伤和多位置损伤的损伤检测实验表明,该方法仅利用各测点在随机激励下的振动响应信号便可以准确定位损伤。
The method of damage detection based on cross-correlation function is improved, and the damage of the composite beam structure can be located without defining the reference point. Firstly, two groups of acceleration responses at each measuring point of intact structure are collected. One group is used as a reference response and the other group is used as its characteristic response. When the structure is damaged, the acceleration responses at each measuring point of the damage structure are collected as its characteristic responses, and the intact structure And the cross-correlation function between the characteristic response and the reference response of the damage structure. Taking the relative change between the maximum value of the cross-correlation function of each measurement point as the damage index and the damage index as the damage index, the damage indexes between the different measurement points are differentiated , Get the corresponding damage location index to locate the damage. Experiments on damage detection of honeycomb sandwich composite beam with single location and multiple location damage show that this method can locate the damage precisely by using only the vibration response signals of each measurement point under random excitation.