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针对某燃油箱在车速变换、路况条件差时,燃油晃动对燃油箱产生较大的冲击、产生异响的问题,运用Hypermesh,NX-Nastran对某燃油箱模型进行模态分析,发现该油箱的第1阶固有频率处在固有频率的危险区域内。在不改变总体结构的情况下,对该油箱的隔板结构进行改进设计,以提高油箱隔板的抗振能力,并对改进后的油箱模型进行模态分析和扫频激振试验。扫频激振试验表明第1阶固有频率为54 Hz,相比改进前得到了提高,而且避开了固有频率的危险区,证明改进是有效的。
Aiming at the problem that a certain fuel tank changes greatly when the vehicle speed changes and the road conditions are poor, the fuel sway has a big impact on the fuel tank and produces abnormal sound. By using Hypermesh and NX-Nastran to analyze the model of a fuel tank, The first natural frequency in the natural frequency of the danger zone. Under the condition of not changing the overall structure, the separator structure of the fuel tank is improved to improve the anti-vibration ability of the fuel tank separator. The modified fuel tank model is modeled and frequency-swept excited test is carried out. The swept-frequency excitation test shows that the natural frequency of the first order is 54 Hz, which is higher than that before the improvement and avoids the danger zone of the natural frequency, which proves that the improvement is effective.