According to the results of the above analysis, in order to achieve the most effective control effect with minimal modification, minimum control cost, this paper proposes the following control strategy: First, the control of the excitation source of the generator itself to achieve the root cause. The purpose is to change the dynamic characteristics of the existing system to achieve the effect of the treatment. The former needs to strictly control the production quality of the generator, and the domestic production level determines the existing product level. The improvement of product quality will inevitably lead to a substantial increase in product cost. Therefore, it is decided to make appropriate improvements to the existing system. Design to change the dynamic characteristics of the system to achieve the purpose of controlling the vibration strength and solving the fracture of the bracket. The original generator compressor support was improved, the compressor bracket was improved, and the improved compressor bracket was used to replace the original bracket to obtain the system model. The improved first 12-order modal frequencies are basically the same as those before the improvement. But the frequency has increased significantly. Modal order original system frequency improvement scheme frequency modal order original system frequency improvement scheme frequency The RMS value of the displacement and velocity of each corresponding measuring point varies with the rotational speed, it can also be seen that the improved system vibration The displacement and speed are significantly reduced at an engine speed of 4,600 rpm. Although the vibration displacement and speed are higher at high speeds above 5000 rpm, it is not a common speed range of the engine, and has little effect on the strength and life of the entire bracket system. After the engine bench test of the improved system, it was found that the vibration displacement and speed of each measuring point were much smaller than the original state when the engine speed was lower than 4600 rpm. After 500h engine frame fatigue life test and 35,000km road reliability and durability test in Hainan, no abnormal belt wear and bracket fracture were found. This proves that the improvement scheme is effective and reasonable.
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