利用拐点圆概念和对称连杆曲线的特性，导出一个简单的方程序。
A simple equation is presented via the theory of inflection circle and the properties of symmetric linkage curve.
刚度与质量参数随机时相频特性均值曲线的拐点位置不变，只是拐点附近曲线陡峭度减小。
The position of knee point of Phase-frequency characteristic mean value curve is invariant, but the kurtosis of the curve near the knee point decreases.
优选将复合帘线的应力-应变曲线中的从低弹性 区域特性到高弹性区域特性的拐点设定在变形的2～7％范围内。
The point of inflection from low elasticity region characteristics to high elasticity region characteristics in a stress-strain curve is preferably set in a range of 2 to 7 % of strain.
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