特种凸轮发动机活塞部件振动频率与温度的关系

Temperature Effect on Vibration Frequency of Special Cam Engine's Piston Component

基于有限元法,应用ANSYS有限元分析软件,对双曲面凸轮发动机活塞部件进行常温和工作温度下的自由模态和约束模态分析,研究了温度对其振动频率的影响,发现由于温度的升高导致了材料弹性模量的下降,而弹性模量的下降又导致了活塞部件在自振频率降低,因此,温度的影响不能忽略.进一步得出活塞部件振动频率与温度的隐式关系,为发动机的减振降噪提供了有益的借鉴.

The structural modal parameters of hyperbolical cam engine＇ s piston component are obtained, in normal temperature and working temperature,by using ANSYS based on the finite element method in the cases of constrained modality and free modality. The temperature effect on the piston vibration frequency is investigated. It is found that the elastic modulus of material decreases due to the increasing temperature, as a result, the vibration frequencies of the piston get lower. So effect of the temperature ought to be considered in the research of the piston. Furthermore, the relation between temperature and vibration frequency is establish. The research is expected to lay a foundation for the vibration reduction design of the engine.