一种四次多项式凸轮机构从动件运动规律
首发时间:2009-12-24
摘要:基于逆时针为正向的转动规律,分析了余弦、正弦加速度、五次多项式运动规律及存在刚性冲击和柔性冲击的特征。提出了采用四次多项式构造运动规律的方法。将升程及其对应的凸轮转角等分为两部分,在第一部分有5个边界条件,可确定5个待定系数。令第二部分的速度线图关于等分点与第一部分的镜面对称,加速度线图关于等分点中心对称,则获得从动件运动规律线图。该运动规律不存在刚性冲击和柔性冲击,速度、加速度线图光滑过渡,对凸轮角速度变化的敏感系数较合理。因而其动力学性能优良。与具有相同特点的五次多项式、摆线运动规律相比,新运动规律更简单、更实用。
关键词: 机械设计及理论 四次多项式 凸轮机构 刚性冲击 运动规律
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A new 4-order polynomial movement law of cam mechanism
Abstract:Based on the discipline of defining inverse hour as the positive direction, the cosine, sine acceleration and 5-order polynomial law are analyzed and the characteristic of rigidity and flexibility attack are studied. The forming of movement law with 4-order polynomial is proposed. Cutting the raise course into two parts, the five undetermined coefficients can be defined by 5 boundary condition of the first part. The velocity drawing of the two parts is mirror symmetry around the cut point. The acceleration drawing of the two parts are center symmetry around the cut point. There is neither rigidity nor flexibility attack under the new movement law. Its velocity and acceleration drawing are smooth and its sensitive coefficient on the cam acceleration is more perfect. So the new movement law has a perfect dynamic property. Contrasting to the other law with the same characteristic, the new law is more simple and practical.
Keywords: machine design and theory 4-order polynomial cam machine rigidity shock movement law
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No.3806410486212616****
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