【推荐】变距弹簧的建构---专题二

一。变距弹簧：
在已知起始螺距、终止螺距、圈数条件下，利用拉格朗日插值法确定Z值变化规律。
实例：
1。新建文件
2。进入MODELING
3。TOOLS--EXPRESSION
输入：END_PITCH=0.5
         START_PITCH=0.1075
         TURNS=5
         OD=1             //弹簧外径
      WIRE_DIA=0.05
         MEAN_PITCH=(START_PITCH+END_PITCH)/2       //平均螺距
      HEIGHT=TURNS*MEAN_PITCH
         RAD=OD/2
         T=1
         XT=COS(360*TURNS*T)*RAD
         YT=SIN(360*TURNS*T)*RAD
         X=T*HEIGHT
         X1=0
         X2=MEAN_PITCH
         X3=HEIGHT-MEAN_PITCH
         X4=HEIGHT
         Z1=0
         Z2=START_PITCH
         Z3=HEIGHT-END_PITCH
         Z4=HEIGHT
         ZT1=(((X-X2)*(X-X3)*(X-X4))/((X1-X2)*(X1-X3)*(X1-X4)))*Z1
         ZT2=(((X-X1)*(X-X3)*(X-X4))/((X2-X1)*(X2-X3)*(X2-X4)))*Z2
         ZT3=(((X-X1)*(X-X2)*(X-X4))/((X3-X1)*(X3-X2)*(X3-X4)))*Z3
         ZT4=(((X-X1)*(X-X2)*(X-X3))/((X4-X1)*(X4-X2)*(X4-X3)))*Z4
         ZT=ZT1+ZT2+ZT3+ZT4
4.INSERT--CURVE--LAW CURVE
建立变距螺旋线：X--XT，Y--YT，Z--ZT
5。INSERT--FORM FEATURE--TUBE
输入：OUTER DIMMOTER=WIRE_DIA
         INNER DIMMOTER=0
         OUTPUT TYPE  选MULPFIPLE SEGEMENT  
6.建立变距螺旋完成.
  
***************若在螺旋线底端建矩形,利用SWEEP,即可建立矩形截面的变距弹簧,也可建其他截面的螺旋!!!注意,扫掠方位方法选FORCED DIRECTION.
  
                          -------------------完
  
         
         

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