内燃机非稳定工况扭振激振力矩 试验分析

For the torsional vibration of the internal combustion engine shafting, the calculation methods of the torsional vibration exciting torque in the stable and unsteady working conditions are compared and analyzed. The cylinder pressure of the internal combustion engine in the unsteady working condition is measured by using a pressure sensor, and the exciting torque of the internal combustion engine in the unsteady working condition is experimentally studied by using the order analysis method, and the relationship between the order torque and the speed-up rate is analyzed. The results show that the main components of the exciting torque of the internal combustion engine are the 1.0 and 2.0 orders, and their amplitudes gradually decrease with the increase of the rotational speed, while the amplitudes of other order torques gradually increase. The order analysis method can effectively analyze the characteristic components in the exciting torque of the internal combustion engine in the unsteady working condition and avoid the "frequency aliasing" phenomenon in the traditional spectrum analysis.

针对内燃机轴系扭转振动，对比分析了稳定工况和非稳定工况扭振激振力矩计算方法。使用压力传感器对非稳定工况内燃机气缸压力进行测量，并利用阶次分析法对非稳定工况内燃机激振力矩进行了试验研究，分析了阶次力矩与提速率之间的关系。结果表明，内燃机激振力矩主要成分为 1.0 和 2.0 阶，其幅值随转速的升高逐渐减小，其他阶次力矩幅值逐渐增加。阶次分析法能够有效地分析出非稳定工况内燃机激振力矩中的特征分量，避免了传统频谱分析出现的“频率混叠”现象。