含间隙润滑铰曲柄滑块机构中铰间作用力的可靠度分析

发布时间：2018-10-30 15:58

【摘要】：以曲柄滑块机构为研究对象,分析其在考虑转动副间隙和润滑作用下并同时考虑系统参数具有随机性时滑块与连杆铰接处铰间作用力的可靠度问题。利用连续接触模型和流体动力学理论分别求出间隙处接触力及润滑碰撞力,基于Newton-Euler法建立曲柄滑块系统的动力学模型。为了克服因为参数选择不准确而使支持向量机回归的预测精度难以达到目标精度这一缺陷,通过遗传算法对支持向量机回归预测模型的各项参数进行寻优处理,获得最优参数值。然后,考虑系统物理参数及几何参数的随机性,利用该方法给出随机参数与功能函数的近似函数关系式,进而利用Monte-Carlo法计算铰间作用力的可靠度。通过算例验证了方法的可行性和有效性。
[Abstract]:Taking the crank and slider mechanism as the research object, the reliability of the force between the slider and the hinge of the connecting rod is analyzed when the clearance of the rotary pair and lubrication are considered, and the system parameters are considered to be random at the same time. Based on the continuous contact model and hydrodynamic theory, the contact force at the clearance and the lubricating impact force are calculated, and the dynamic model of the crank slider system is established based on the Newton-Euler method. In order to overcome the disadvantage that the prediction accuracy of SVM regression is difficult to reach the target precision because of inaccurate parameter selection, the parameters of SVM regression prediction model are optimized by genetic algorithm. The optimal parameter value is obtained. Then, considering the randomness of the physical and geometric parameters of the system, the approximate function relationship between the random parameters and the function is given by using this method, and the reliability of the force between hinges is calculated by the Monte-Carlo method. The feasibility and effectiveness of the method are verified by an example.
【作者单位】：西安科技大学机械工程学院;西安电子科技大学机电工程学院;
【基金】：陕西省自然科学基金项目(2014JM7252)资助~~
【分类号】：TH112

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