Study results show that hyperbolic tangent hysteretic model can describe the mechanical behavior of magnetorheological damper perfectly and it is simple in form, explicit in concept and easy to apply.

结果表明，双曲正切滞回模型能很好地描述磁流变阻尼器的力学性能，且形式简单、概念明确，适合实际应用。

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On this basis, a practical simple way to construct by the conical curves the common tangent circle is presented.

在此基础上，提出了简便、实用的圆锥曲线公切圆作图法。

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And give out the unified optical path, Newton's ring radius and convex lens curvature radius measurement formula of non - contact type, simple cutting type and tangent type Newton's Rring.

并给出了非接触式、浅近切割式及相切式牛顿环的统一的光程差，牛顿环半径及凸透镜曲率半径测量公式。

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