Modelling and analysis on the vibration excitation of a three-cylinder engine considering inertial parameters of connecting rods

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (2) : 247-252.

ZUO Shuguang1， WANG Jun1， ZHOU Dawei1， YAN Jiao2， AN Yiling2， WU Xudong1

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Abstract

To reduce the inaccuracy in excitation calculation of a three-cylinder engine,a new modeling calculation method was proposed.Considering the inertial parameters of connecting rods and other components,a theoretical expression for the vibration excitation of the three-cylinder engine was deduced based on the Lagrangian multiplier method.Then the excitation of the engine was calculated,unbalance inertia moments in all three directions were found,whereas the excitation around the z-axis will not appear,if calculating by traditional simplified methods.A model for the powertrain mounting system was built considering the frequency-dependent characteristics of the hydraulic engine mount,and the vibration accelerations at mount locations were simulated.Then the vibrating accelerations were measured through the idle vibration experiments on a sample car.By comparing the simulation results with measured values,the accuracy and superiority of the method considering inertial parameters of connecting rods was verified.The method can be used in the situation where high accuracy is needed.

Key words

three-cylinder engine / excitation modelling / inertial parameters / Lagrangian multiplier method

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ZUO Shuguang1， WANG Jun1， ZHOU Dawei1， YAN Jiao2， AN Yiling2， WU Xudong1. Modelling and analysis on the vibration excitation of a three-cylinder engine considering inertial parameters of connecting rods[J]. Journal of Vibration and Shock, 2019, 38(2): 247-252

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