Prediction and validation of dynamic characteristics of a valve train system with flexible components and gyroscopic effect
Prediction and validation of dynamic characteristics of a valve train system with flexible components and gyroscopic effect
复制标题
具有柔性部件和陀螺效应的气门机构系统动态特性的预测和验证
DOI：
10.1016/j.mechmachtheory.2020.104222
复制
发表时间：
2021-03-01
影响因子：
5.2
通讯作者：
Yin, Lairong
中科院分区：
文献类型：
--
作者：
Hu, Bo;Zhou, Changjiang;Yin, Lairong
传动部件的柔性和内应力是发动机高精度轻量化发展的主要考虑因素。在高速发动机中，还应考虑转轴和转子的陀螺效应。为此，提出了配气机构系统的弹性动力学模型。该模型包括凸轮轴和连杆机构的多轴柔性、凸轮轴和凸轮转子的陀螺效应、凸轮的离心力以及凸轮-凸轮副的摩擦力和力矩。然后，利用所提出的模型预测了固有频率、模态振型、推杆应力和壳体振动。结果表明，转子和凸轮轴的陀螺效应通过改变凸轮轴的刚度对系统的固有频率有明显的影响。应力实验结果表明，该模型能有效地预测动应力。此外，怠速和最高工作转速推荐使用的预测模型和振动实验验证。因此，该模型可作为发动机调整、提高部件耐久性、确定怠速和最高转速的重要参考。(C)2020爱思唯尔有限公司保留所有权利。
Flexibility and inner stress of transmission components are main considerations in the development of high-precision and lightweight engines. Gyroscopic effect of rotary shaft and rotor should also be considered in high-speed engines. Therefore, an elastic dynamic model of a valve train system is proposed. The model includes multiaxial flexibilities of camshaft and linkages, gyroscopic effect of the camshaft and cam rotor, centrifugal force of cams and friction force and moment of the cam-tappet pair. Then, the natural frequency, mode shape, pushrod stress and housing vibration are predicted using the proposed model. Results show that the gyroscopic effect of the rotors and camshaft apparently affects the natural frequency of the system by changing the camshaft stiffness. The proposed model can effectively predict the dynamic stress, as proven by a stress experiment. In addition, idling and maximum working speeds are recommended using the predicted model and verified by a vibration experiment. Thus, the proposed model can be an important reference in engine adjustment, improvement of component durability and determination of idling and maximum speeds. (C) 2020 Elsevier Ltd. All rights reserved.