Failure analysis and optimization design of a cooling fan in auxiliary converter

2020 IEEE Vehicle Power and Propulsion Conference (VPPC) Pub Date : 2020-11-01 DOI:10.1109/VPPC49601.2020.9330837

Peng Xuanlin, Tang Xionghui, Qi zimei, X. Liang, Zeng Yaping

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Abstract

Failure analysis and optimization design is carried out to solve the on-site problem of the fan in auxiliary converter based on the FEA (finite element simulation) and surrogate-model. Firstly, the mechanism of fan failure is analyzed by field vibration test and modal simulation, and the local resonance caused by insufficient stiffness of the installation structure is determined as the cause of the failure. Then, according to the excited modal shape, the retrofit scheme of mounting-net diagonal reinforcement is designed, and the performance of the retrofit scheme is evaluated by using acceleration spectrum response simulation. Furthermore, a surrogate model is established to fit the mapping relationship between the characteristic parameters and the vibration response characteristics of the retrofit scheme, and an objective function is defined to obtain the optimal solution of characteristic parameters of strengthening scheme by taking avoiding resonance, reducing vibration intensity and reducing reconstruction cost into consideration. Finally, the validation test is carried out. The results show that the strengthening scheme can effectively solve the local resonance problem of the fan and improve the service life of the fan.

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辅助转炉冷却风扇失效分析及优化设计

基于有限元模拟和代理模型，对辅助转炉风机进行了故障分析和优化设计。首先，通过现场振动试验和模态仿真分析了风机失效机理，确定了安装结构刚度不足引起的局部共振是导致风机失效的原因;然后，根据受激模态振型，设计了安装网对角加固加固方案，并通过加速度谱响应仿真对加固方案的性能进行了评价。建立代理模型拟合加固方案特征参数与振动响应特性之间的映射关系，定义目标函数，以获得避免共振、降低振动强度和降低改造成本的加固方案特征参数的最优解。最后进行了验证试验。结果表明，该强化方案能有效解决风机局部共振问题，提高风机使用寿命。

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2020 IEEE Vehicle Power and Propulsion Conference (VPPC)

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