用两种软件对比分析四缸发动机振源

针对某直列四缸发动机,利用MATLAB和ADAMS两种软件分别对其进行振源分析。首先通过理论分析初步确定该机的主要激振源:二阶往复惯性力和倾覆力矩,利用MATLAB软件对激振源的时频域特性进行研究。然后应用ADAMS软件对该发动机进行动力学仿真,在后处理中选择适当位置的测量信息,经过进一步分析确定该机的激振源类型及其时频域特性。将用ADAMS分析得到的结果与MATLAB分析得到的结果进行对比,其一致性良好,从而验证两种分析方法的正确性。分析结果为进一步对该发动机进行振源控制提供必要的数据参考。

Comparative Analysis of Vibration Source of Four-Cylinder Engine Using Two Commercial Codes

The vibration sources of a four-cylinder engine are analyzed using MATLAB and ADAMS codes. Firstly, the main vibration excitation sources of this engine, the second order reciprocating inertia force and the overturning moment, are gained through theoretical analysis. The characteristics of the excitation sources are investigated in both time domain and frequency domain using MATLAB code. Afterwards, the finite element model of the engine is built and the dynamic simulation is performed using ADAMS code. Then, in the post-processing, using the measured signals in the properly selected positions, types of the main vibration excitation sources and their characteristics in both time domain and frequency domain are gained. The results froin the two codes are found to be in good accordance with each other. Thus, the validity of the two methods is verified. The results gained in this paper provide some necessary data for vibration control of engines.