关键词: 汽车散热器；有限元法；模态频率与阵型

Abstract: Automobile radiator is one of the important parts of vehicle thermal management, which is prone to resonance and noise during vehicle driving, which may lead to leakage and other failures. This problem can be avoided by modal analysis in the design stage. Three methods are used to construct the finite element model of the heat exchanger, and the modal analysis is carried out. The first-order modal frequencies of the three methods are 80.89 Hz, 82.116 Hz and 108.94 Hz respectively. The formation differences of the two methods with similar first-order modal frequencies are compared, and the two methods with higher solving accuracy are finally determined. Based on these two methods, the first three mode frequencies of the heat sink in the actual working condition are solved, and it is found that the mode frequency is reduced, which is consistent with the practice. The research provides a reference for radiator simulation method and vehicle level finite element simulation model simplification.

Key words: Automobile radiator; Finite element method; Modal frequency and formation