论文部分内容阅读
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。
Taking the piping of a certain air conditioner as an example, this paper studies the dynamic characteristics of the piping by combining the theoretical modal calculation method and the experimental modal analysis method. Firstly, the dynamic model of the piping structure of the air conditioner outside is established, and the theoretical model is calculated by the finite element analysis software. The first 12 natural frequencies and mode shapes are obtained. Then the single modal response of the single-point excitation was used to test the modal analysis of the piping. The modal parameters of the first 12 orders under the actual constraints were obtained. The results show that the experimental modal analysis is in good agreement with the finite element analysis, which verifies the correctness of the theoretical modalities and provides credible conditions for further research. At the same time, it finds out the reason of excessive vibration in the rated work of pipelines and provides a reliable basis for vibration reduction measures and structural improvement.