温度变化下复合材料层合板的试验模态分析

Experimental modal analysis of the composite laminates with temperature variation

通过动力测试试验研究了环境条件变化对复合材料层合板振动特性的影响,这对于复合材料结构基于动力响应健康监测和振动控制系统设计使用的安全性具有重要意义。在不同温度条件下利用锤击以及激振器实验方法测定复合材料层合板的动力响应,采用随机子空间法(SSI)识别了其固有频率、阻尼以及模态振型。研究结果表明,复合材料层合板结构固有频率及阻尼比与温度变化存在逆相关关系,而所识别的模态振型变化并没有非常清晰的相关关系。分析结果进一步表明,复合材料结构振动控制和健康监测系统设计过程中需要考虑上述影响。

The effect of varying environmental conditions on the modal properties of composite laminates was studied by experimental tests, which is vital for the safety of vibration-based structural health monitoring （SHM） and vibration control techniques. The structure responses were measured with different temperature conditions by exciter and hammer tests. The modal parameters of composite laminates were identified by the Stochastic Subspace Identification （SSI） method. It is found that the frequencies and damping ratios have a strong negative correlation with temperature, but no clear correlation of mode shapes with temperature changes can be observed. These experimental test results indicate that the influence of temperature variation should be considered during the design process of structural health monitoring and vibration control techniques in laminated composite engineering systems.