1) theorems of parabolic chord
抛物线弦定理
3) sine-parabolic
正弦-抛物线
1.
By simulating,computing and analyzing FB2,sine-parabolic and high-order polynomial the cam profile of asymmetrical valve train,the influences of characteristic parameters such as velocity at the end of buffering zone,lift at the end of buffering zone,half-angle of base zone on the cam profile,and the valve movement as well as the self characteristic response of every cam profile were analyzed.
通过对复合二摆、正弦-抛物线、高次多项式3种非对称配气凸轮型线的仿真计算和分析,总结出了缓冲段终点速度、缓冲段终点升程、基本段半包角等特性参数的变化对几种凸轮型线和气门运动规律影响的共性和各型线自身的特征响应,为配气凸轮型线设计方案的选择和目标性设计调整提供了参考依据。
4) inferences of parabolic chord
抛物线弦推论
5) parabolic law
抛物线定律
1.
Multi-stage oxidation kinetics was observed at different oxidation temperature,each stage followed Wagnar s parabolic law with different K_p.
在不同的氧化温度下,样品氧化动力学都具有阶段氧化特性;每一阶段都具有不同的Kp,都遵循Wagnar抛物线定律。
6) parabola theory
抛物线理论
1.
Multi-span engineering ropeway design based on parabola theory;
抛物线理论多跨索道设计模型
2.
Formulas for calculating the non-stress length of cable for cable-stayed bridges using cate-nary theory and parabola theory are derived in this paper.
推导了用悬链线理论与抛物线理论计算斜拉桥拉索无应力长度的公式 ,以南京长江第二大桥南汊斜拉桥为例 ,分析了用悬链线与抛物线理论计算拉索无应力长度的差别。
3.
This text build with a single aerial ropeway for the basic model,make use of the structure of the beginning start equilibrium type to analisys the difference of catenary,theory and parabola theory,by the two kinds of theorieses comparison to build a reasonable method which single aerial ropeway structure calculation should be choose.
主要以架空单索为基本模型,利用悬索结构的初始平衡构型分析了索计算理论中的"悬链线理论"与"抛物线理论"之间的区别,通过两种理论的比较确定了架空单索结构计算时应选用的一种合理方法。
补充资料：相交弦定理
相交弦定理：圆内的两条相交弦，被焦点分成的两条线段长的积相等
几何语言：∵弦ab、cd交于点p
∴pa·pb=pc·pd（相交弦定理）
推论：如果弦与直径垂直相交，那么弦的一半是它分直径所成的两条线段的比例中项
几何语言：∵ab是直径，cd⊥ab于点p
∴pc2=pa·pb（相交弦定理推论）
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条