关键词: 机电工程, 三缸柴油机, 曲轴, 动平衡, 仿真

Abstract: A rigid body model and a flexible body model for a crankshaft of a three cylinder diesel engine were established by using Pro/E and Adams. The dynamic loads, spectral curves and integral curves of each spindle neck were obtained by using fast Fourier transformation, and the balance performance of the whole machine was judged by the amplitude of various frequencies. In X direction (longitudinal), it is found that different first-order reciprocating inertia moment transfer ratio has little influence on the vibration amplitude of the crankshaft spindle hinge pairs. In Y direction (transverse), it is found that from the frequency domain signal, different transfer rate of the first order reciprocating inertia moment reaches the maximum at the same frequency, and the root mean square decreases with the decrease of the transfer rate of the reciprocating inertial moment. In Z direction (transverse), the different first-order reciprocating inertia moment transfer rate has little influence on the two-order frequency vibration of the crankshaft main shaft hinge pairs. In different first-order reciprocating inertia moment transfer rate, the variation trends of maximum, mean and root mean square of resultant forces on crankshaft main journals are different. Among them, the root mean square (RMS) can reflect the vibration strength most comprehensively.

Key words: electromechanical engineering, three cylinder diesel engine, crankshaft, dynamic balancing, simulation