间隙铰链对平面机构碰撞动力学特性影响分析  

Effects of clearance joint on impact dynamic characteristics of planar mechanisms

作　　者：王旭鹏 刘更[2] 马尚君[2] 佟瑞庭[2] 薛艳敏 

机构地区：[1]西安理工大学艺术与设计学院工业设计系,西安710054 [2]西北工业大学陕西省机电传动与控制工程实验室,西安710072

出　　处：《振动与冲击》2017年第17期74-78,共5页Journal of Vibration and Shock

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)

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。Here,the effects of clearance joint on impact dynamic characteristics of planar mechanisms were studied. At first,a line-contact impact joint model with axial sizes was established. Based on an improved nonlinear normal impact force model and a modified tangential Coulomb friction force model,the effect laws of clearances on impact dynamic characteristics of a planar slider-crank mechanism were studied through analyzing slider acceleration,clearance joint＇s contact force,acceleration frequency spectra and velocity-acceleration phase diagram under different clearances.The results showed that the larger the clearance,the bigger the oscillation amplitude of the mechanism ＇s dynamic characteristics,and the lower the oscillation frequency; the larger the clearance,the more nonlinear the mechanism＇s dynamic characteristics.

关 键 词：非线性碰撞力模型 间隙铰链 碰撞动力学 

分 类 号：TH112[机械工程—机械设计及理论]