空调配管理论模态分析与试验研究
Finite Element and Experimental Modal Analysis on Connecting Pipes of Air Conditioner

以某款空调外机配管为对象，结合理论模态计算方法和试验模态分析方法对配管进行动态特性研究。首先对空调外机配管结构建立动力学模型并用有限元分析软件对其进行理论模态计算，得出前12阶固有频率和振型。随后利用单点激励单点响应的方式对配管进行了试验模态分析，得到了系统在实际约束下前12阶的模态参数。研究表明：试验模态分析结果和有限元分析吻合，验证了理论模态的正确性，为进一步研究提供了可信的条件。同时，找出了配管额定工作时振动过大的原因，为减振措施和结构改进提供了可靠的依据。
The pipes connecting compressor and heat exchange coils plays an important role in the noise and vibration performance of air conditioner. In this paper, the dynamic characteristics of the pipes are analyzed with both FEM (finite element method) and experimental method. The first twelve natural frequencies and mode shapes were obtained from dynamic analysis of FEM model. Then, the experimental modal analysis was performed on the real pipes with hammer excitation method. The differences between the FEM analysis and experimental results were compared, and solutions to suppress pipe vibration has been proposed. The study shows that pipe vibration dynamic characteristics, which can be efficiently verified by experimental modal analysis, provides reliable theoretical basis for controlling vibration and noise of air-conditioner pipes