间隙铰链对平面机构碰撞动力学特性影响分析

发布时间：2018-03-24 11:08

本文选题：非线性碰撞力模型　切入点：间隙铰链　出处：《振动与冲击》2017年17期

【摘要】：为了研究间隙铰链对机构动态性能的影响,建立了一种含轴向尺寸的线接触碰撞铰模型,在此基础上提出一种改进的非线性法向碰撞力模型和修正的切向库伦摩擦力模型,以平面含间隙铰链曲柄滑块机构为研究对象,通过不同间隙值下的滑块加速度、间隙铰链处接触力、加速度频谱以及速度-加速度相图分析,研究了间隙值对机构碰撞动力学特性的影响规律。研究结果表明:间隙会导致机构动态性能出现明显的振荡现象,且随着间隙值的增大,振荡加剧、振荡幅值上升,但振荡频率降低;同时,在间隙铰链的影响下,机构动态特性呈现出非线性现象,且间隙越大,非线性现象越明显。
[Abstract]:In order to study the effect of clearance hinge on the dynamic performance of the mechanism, a linear contact impact hinge model with axial dimensions is established. An improved nonlinear normal impact force model and a modified tangential Coulomb friction model are proposed. Taking the planar crank slider mechanism with clearance hinge as the research object, the acceleration of the slider, the contact force at the clearance hinge, the acceleration spectrum and the velocity-acceleration phase diagram under different clearance values are analyzed. The effect of clearance value on the dynamic characteristics of mechanism collision is studied. The results show that the gap will lead to the obvious oscillation phenomenon of the mechanism dynamic performance, and with the increase of the gap value, the oscillation intensifies and the oscillation amplitude increases. At the same time, under the influence of clearance hinge, the dynamic characteristics of the mechanism show nonlinear phenomenon, and the bigger the gap is, the more obvious the nonlinear phenomenon is.
【作者单位】：西安理工大学艺术与设计学院工业设计系;西北工业大学陕西省机电传动与控制工程实验室;
【基金】：国家自然科学基金(51275423;51505381) 西安理工大学博士启动基金(106-400211001);西安理工大学校基金(106-256211408)
【分类号】：TH112

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