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利用软件EXCITE-designer对柴油机4105曲轴进行数学建模,建立了基于集中质量-弹簧-阻尼的系统模型,获得了曲轴扭转振动的自由振动频率和振型,计算了曲轴的强迫振动;分析了减振器的惯性块惯量对谐次波的影响,匹配了减振器。结果表明,柴油机在2 560,2 735和3 125 r/min附近转速下发生了较大的扭转共振;随着减振器惯性块惯量ID的增大,各谐次波的临界转速逐渐减小,匹配减振器后大幅降低了曲轴的扭转振幅,表明所设计减振器有较好效果。
The software crankshaft 4105 crankshaft was modeled with software EXCITE-designer, and the system model based on mass-spring-damping was established. The free vibration frequencies and modes of crankshaft torsional vibration were obtained and the forced vibration of crankshaft was calculated. The influence of the inertia block inertia of the resonator on the harmonic wave matches the shock absorber. The results show that the torsional resonance of the diesel engine occurs at speeds of 2 560, 2 735 and 3 125 r / min. With the increase of the inertia mass (ID) of the inertia mass of the shock absorber, the critical speed of each harmonic decreases gradually , After matching the shock absorber, the torsional amplitude of the crankshaft is greatly reduced, indicating that the designed shock absorber has better effect.