This paper gives a calculating method of the error of rectangle spline hob profile designed on the theory of plane engagement, with the errors of some hobs calculated.
此文给出了按平面啮合原理设计矩形花键滚刀齿形的误差计算方法，并计算了几种规格的滚刀的齿形误差。
Three additional displacement ratio calculating methods, i. e., the first mode method, elastic time history analysis method and calculating plane end displacement method, are suggested.
提出了三种计算结构位移比的补充方法，即第一振型法、弹性时程分析法和推算平面端部位移法。
In previous method for calculating culvert length, first, the plane is analysed, then the calculation formula is found out.
以往的涵洞长度计算方法都是从平面上着手分析、考虑并找出其计算公式的。
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