cmd命令求助

wx5530

大家好，我在网上看到有个绳索建模的cmd命令流，添加bushing的原文如下defaults model model_name=.MODEL_1  variable create variable_name=ip integer_value=1
while condition=(ip<28)
marker create  &   
  marker_name = (eval(".MODEL_1.PRT_"//ip//".MARKER_1"//ip+1000))  &  
  location = (eval(".MODEL_1.PRT_"//ip//".cm.location)) &  
  orientation = (eval(".MODEL_1.PRT_"//ip//".cm.orientation)) &
marker create  &  
  marker_name = (eval(".MODEL_1.PRT_"//ip+1//".MARKER_1"//ip+2000))  &  
  location = 0.0,(eval(ip*50)),0.0  &  
  orientation = 0d, 90.0d, 90.0d  
force create element_like bushing  &  
bushing_name = (eval(".MODEL_1.bushing_"//ip)) &
adams_id = (eval(ip)) &  
i_marker_name = (eval(".MODEL_1.PRT_"//ip//".MARKER_1"//ip+1000)) &
j_marker_name = (eval(".MODEL_1.PRT_"//ip+1//".MARKER_1"//ip+2000)) &
damping = 1, 1, 1  &  
stiffness = 5.9346e4,5.9346e4 ,5.9346e4 &
tdamping = 1 , 1 , 1  &
tstiffness = 5,5 ,5   
variable modify variable_name=ip integer_value=(eval(ip+1))
end!while  
variable delete variable_name=ip
我想直接把绳子小段的质心当作marker点，不知道怎么改程序啊