内燃机配气机构系统刚度的虚拟设计

为了确定内燃机配气机构两质量简化模型中配气机构系统刚度这一关键参数,对现有WD615机型的配气机构进行了三维建模,应用不同结构单元划分方式进行了有限元计算,在此基础上求解了多种型号配气机构系统刚度。在标定试验系统精度的基础上,采用激光传感技术对仿真结果进行了试验验证。研究结果表明:应用有限元方法计算配气机构刚度较为准确,计算结果和试验结果误差在5%之内。以刚度统计结果为基础,得出随着气门质量的增加配气机构系统刚度近似成二次多项式增加,气门系统自振频率位于30000～50000次/min。该研究为开发新型配气机构提供了依据。

Virtual design of rigidity for valve train system in internalcombustion engine

In order to define the stiffness of the two-mass valve train model which is the key parameter of the valve train system, the finite element calculation was carried out by using different methods of compartmentalizing component based on the creation of the 3D models of every component of the valve train of WD615. The stiffness values of various valve train systems were calculated by using the simulation method mentioned above. After the calibration of the test system, the simulation results were tested by using the technique of laser measurement. The simulation and test result showed the reasonability and accuracy of the FEM method and the measurement error was limited to 5%. It coule be concluded that there was a quadratic polynomial increase between the valve train stiffness and the quality of the valve while the natural frequency of valve system waved between 30 000 to 50 000 times/min based on the statistical results. This research could provide the theory basis of developing the new valve train system.