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目前,内燃机轴系受迫扭振幅通常采用近似方法计算,这些方法假设强迫振动的振形与共振频率下自由振动的振形相同或忽略非共振情况下阻尼的作用。除去阻尼系数难以准确确定的因素外,上述假设与实际阻尼系统的差别,也是构成计算误差的一个重要原因。本义从内燃饥轴系有阻尼多质量系统的微分方程出发,着重结合汁算机方法展开,导出了轴系参数矩阵的元素表达式,并设计了在角频率递变时自动实现矩阵变换及求解的计算机算法。本方法克服了近似方法的假设所造成的误差,是一种适合于共振和非共振振幅计算的实用方法,程序在计算机上通过,经简例证明,是一种准确而有效的方法。
At present, the forced torsional amplitudes of internal combustion engine shaft systems are usually calculated using an approximate method. These methods assume that the vibration shape of the forced vibration is the same as the vibration shape of the free vibration at the resonance frequency or ignores the damping effect under the non-resonance condition. Except for the factor that the damping coefficient is difficult to be determined accurately, the difference between the above assumptions and the actual damping system is also an important reason for the calculation error. Based on the differential equations of the damping mass system with internal combustion starvation system, this paper introduces the element expression of shaft parameter matrix with the help of the computer method, and also realizes the matrix transformation and solution automatically when the angular frequency changes Computer algorithm. This method overcomes the error caused by the assumptions of the approximate method and is a practical method suitable for the calculation of resonant and non-resonant amplitude. The program is passed on the computer and proved to be an accurate and effective method by a simple example.