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(一)前言对于柴油机轴系来说,必须进行扭转振动计算及测量以确定轴系工作的安全状态。扭振计算的数理模型一般是将轴系离散成集总参数的多自由度线性系统。计算系统自由振动的各阶频率及振型,以及在柴油机工作转速范围内已定转速下各谐次的强迫振动,尤其是临界转速下的共振状态。为求得轴系质量的总和周期振动形式以及轴段的总和扭振应力,需将多个谐次分量在考虑干扰及振动的相位关系后在时
(A) Foreword For diesel engine shaft system, torsional vibration calculation and measurement must be carried out to determine the safety status of the shaft system. The mathematical model of torsional vibration calculation is generally a multi-degree-of-freedom linear system that disperses the shaft system into lumped parameters. Calculate the order of the system free vibration frequency and vibration mode, as well as in the range of diesel engine operating speed has been set at the rated speed of the forced vibration of each harmonic, especially the critical speed of the resonance state. In order to obtain the total periodic vibration quality of the shaft system and the total torsional vibration stress of the shaft section, a plurality of harmonic components need to be considered after the phase relationship of the interference and the vibration