基于ANSYS的内燃机气门控制装置的动力学分析

摘要

In this paper,a new type of valve opening cylinder control device was introduced.The device can realize cylinder deactivation and decompression starting.In order to verify its reliability,the control device installed on the 6135 diesel engine was taken for example.The transient dynamic analysis,modal analysis and harmonic response analysis of the fixed plate were carried out by using ANSYS software.The stress,deformation,natural frequency and the response of the vibration excitation load were analyzed,and the optimization was carried out.The analysis results show that increasing the radius of the fixed plate corner to 15 mm can increase the rigidity of the fixed plate,and the natural frequency.The first order natural frequency was increased by 16.05％,and the first order response frequency increase from 90 Hz to 110 Hz was helpful to avoid the resonance.At the same time,the static load and impact load are obviously improved.The stable stress value was reduced by 43％,the oscillation amplitude decreased by 29.6％,and the stable time dropped by 14.28％.It is beneficial to improve the reliability of valve control device.%介绍了一种新型内燃机气门开缸控制装置,可实现分缸断油、自动减压起动.为验证其可靠性,以在6135型柴油机上加装的控制装置为例,利用ANSYS软件对压板进行了瞬态动力学分析、模态分析和谐响应分析.分析了压板的应力、变形、固有频率以及对振动激励载荷的响应情况并进行了优化,分析结果表明将压板拐角处圆角半径增大至15 mm可提高压板刚度,提高固有频率,使第1阶固有频率提升了16.05％,第1阶响应频率由90Hz提升至110 Hz有利于避开共振,同时对静载荷和冲击载荷的承受情况均有明显改善,稳定后的应力数值降低了43％,冲击造成的摆动幅值下降了29.6％,稳定时间下降了14.28％,有利于气门控制装置可靠性的提高.