jimosea 发表于 2023-12-26 17:26:27

2280X2000X200防冲板强度计算书


1. Calculation Conditions ( 计算条件)Contact angle(接触角度): 10o   Frame Size(防冲板尺寸宽 x 长 x 厚) :2000Bx 2380L x 200H
2. Calculation of Sectional Force (局部力的计算方式)Among sectional forces, Bend Moment M becomes maximum just before a vessel contact to the board (M max). Thus M max and S max ( maximum sectional force) under M max could be calculated shown below(在局部力之中,就在船只接触护板同时弯曲矩 M 变成最大 (M最大)。因此在M最大 下的M最大 和 S最大 (最大局部力)应按以下方式计算2.1 Maximum Bend Moment ( M max)最大弯曲矩 (M最大)Provided a vessel contacts a board at angle of 10 degrees horizontally, the board is considered to be a beam regarding a rubber parts as a spring and a chain attachment position as a fulcrum. Thus, bend moment could be calculated. (假设船只以10度角接触护板,而护板可认作是一个横梁, 橡胶部分认作是弹簧,链条部分的位置作为支点,则弯曲矩可如下计算)

      Picture 1.Calculation Model for Bend Moment      (图1:弯曲矩的计算模型)
Max bend moment (M max) could be calculated by the following process because it generates just before a vessel contact the board. 因为只有当船只接触护板时才可产生最大弯曲矩 (M最大),所以它可以按下列程序计算
That is, Load F = 610kN (就是说橡胶的加载F = 754kN)Accordingly, by putting L = (415+1050) = 1465mmL1 = 415mm;L2= 1050mm据此, L =(415+1050) = 1465mmL1 = 415mm;L2= 1050mm
M max = 610 x 1000 x 1050x 415/1465= 1.776 x 108N·mm2.2 Maximum Shearing Power ( S max) (最大剪切力)
   It generates in a chain attachment position, and the power becomes equal to the load which acts on a chain exactly. That is, Smax = 305kN    (它产生于链条附件位置,该剪切力等同于作用于链条上的加载)

3. Stress Examination (应力测定)3.1 Cross-sectional form for M max is as follows: (M最大 的横截面形式如下:)At first, the cross-sectional second moment of this section and the cross-sectional coefficient Z are calculated.(首先计算本部分的横截面的第二力矩和横截面系数Z)Cross-sectional second moment I = 2.425 x 108 (横截面的第二力矩)Cross-sectional coefficient Z = 2.46 x 106(横截面系数Z)       Thus, bending stress σ= M max/Z = 2.425 x 108/2.46 x 106      (因此弯曲应力) = 98.6N/mm2 < SS400 acceptable stressσa = 140N/mm2      Therefore, it can be said enough safe. (因此可以说是足够的安全)

                Picture 2. Cross-sectional form of the perpendicular direction               (图2:垂直方向的横截面形式)   3.2 Cross-sectional stressЧ for S max can be considered to be taken by wave and calculated as follows: (针对S最大横截面应力可认为从波状运动中获取并计算如下)
Cross-sectional stress Ч = S max/Aw横截面应力 Aw: cross section area of wave ( = 10800mm2)(Aw:波状运动的横截面区域       Ч = 310 x 1000/10800          = 28.7N·mm2 < SS 400 acceptable stressσa = 80N/mm2    Therefore, it can be said enough safe.(因此可以说是足够的安全)

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