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分别采用两种联轴器和两套支撑系统进行了发动机扭振试验。试验结果表明,台架支撑系统和联轴器会对发动机扭振试验结果产生很大影响。通过理论分析发现,发动机采用不同支撑系统时,传感器支架振动也会不同,从而造成扭振试验结果存在差异。利用某发动机扭振仿真模型,提取影响系统扭振的因子,并进行敏感度分析,发现联轴器主动端惯量是影响发动机扭振综合幅值的主要参数。为保证扭振试验有效性,建议应根据不同试验目的,采用不同试验设计方案。
The torsional vibration tests of the engine were carried out with two kinds of couplings and two support systems respectively. The experimental results show that the support system and the coupling of the gantry will have a great influence on the torsional vibration test results of the engine. Through theoretical analysis, it is found that the vibration of the sensor bracket will be different when the engine adopts different support systems, resulting in the difference of torsional vibration test results. The torsional vibration simulation model of a certain engine is used to extract the factors that affect the torsional vibration of the system and the sensitivity analysis is carried out. It is found that the inertia of the primary side of the coupling is the main parameter affecting the comprehensive amplitude of the torsional vibration of the engine. In order to ensure the validity of torsional vibration test, it is suggested that different experimental design schemes should be adopted according to different experimental purposes.