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七、凸轮曲线设计的合理性由(23)式知最大动载荷(最大冲击力)P_(max)、为静载荷(静重)W的(1+a_0)倍。再按(17)式知a_0为峰值冲击加速度系数,为重力加速度g之倍数。若系数a_0=5,即峰值冲击加速度为5个g,那末P_(max)=(1+5)W=6W。即动载荷为静载荷的6倍。若冲击加速度为9个g,则动载荷将为静载荷的10倍,以此类推,可见动载荷较之静载荷差别甚大。要减小动载荷,则必须使a_0减小。又由(18)式知要减小a_0,首先要求U_0要小,这是一个原则。现按此原则来分析研究两种最常用的凸轮曲线——等速和等加速规律,究竟何种曲线为合理和优越?
Rationality of Cam Curve Design The maximum dynamic load (maximum impact force) P_ (max) is the (1 + a_0) times of the static load (static weight) W from (23). Press (17) to know that a_0 is the peak impact acceleration coefficient, which is a multiple of the acceleration of gravity g. If the coefficient a_0 = 5, that is, the peak impact acceleration is 5 g, then P_max = 1 + 5W = 6W. Dynamic load is 6 times of static load. If the impact acceleration of 9 g, then the dynamic load will be 10 times the static load, and so on, we can see that the dynamic load than the static load varies greatly. To reduce the dynamic load, you must reduce a_0. Again by (18) known to reduce a_0, first of all require U_0 smaller, this is a principle. Now according to this principle to analyze the two most commonly used cam curve - equal velocity and equal acceleration law, what kind of curve is reasonable and superior?