基于试验设计的空调管路结构参数优化设计

Optimization of Air Conditioning Pipeline Structure Parameters based on Experiment Design

针对空调管路的振动问题,提出了一种降低管路振动响应,提升管路抗振性能,轻量化管路的优化设计方法.利用正交试验挑选出对管路振动最大位移和管路振动最大应力有显著影响的结构参数,并拟合了显著结构参数与管路振动最大位移、管路振动最大应力及管路质量的二阶响应面模型,采用非劣排序遗传算法对响应面模型进行多目标求解并筛选出最优解.优化后的管路振动最大位移、振动最大应力、质量分别下降了76.51%,86.73%,27.21%,且空调管路的模态特性得以改善,提升了空调管路的抗振性能.所提出的研究方法可为管路结构的优化设计提供参考.

Aiming at reducing vibration response and mass of air conditioning pipeline with improved anti-vibration performance,an optimized design method for an air conditioning pipeline is proposed.Based on the vibration characteristic equation of air conditioning pipeline and finite element technology,the dynamic analysis of the air conditioning pipeline is carried out,and the results of the modal analyzing and harmony response analysis of the original pipeline are obtained.The orthogonal test method is used to determine the influence of the pipeline multiple structure parameters,the interaction between them on the vibration displacement and vibration stress of the pipeline and the selected significant structural parameters.The second-order response surface model is constructed by fitting the selected structural parameters and the vibration displacement,vibration stress and pipeline quality of the pipeline.The established second-order response surface model is optimized with non-dominated sorting genetic algorithm(NSGA-II).By using the optimized results of the wall thickness of the pipeline,the length of the pipeline between the bend and the end of the compressor,the space angle and the length of the u-shaped pipe in an air conditioning pipeline,the exoeriment results show that the vibration displacement,vibration stress and pipeline quality are decreased by 76.51%,86.73%and 27.21%respectively,and the natural frequency of the air conditioning pipeline system is far away from the force frequency,effectively avoiding resonance.The proposed method provides the reference for pipeline optimization design.