AMESim14弹簧预紧力的设定

BAP016弹簧预紧力的设定
在AMESim13版本以前，可以设置spring force at zero displacement
但到了AMESim14版本，没有spring force at zero displacement，变成了spring compression at zero displacement of the piston和pring force at zero compression, positive for compressive force on spring，应该怎么设置弹簧预紧力？

spring compression at zero displacement of the piston设为0
此时spring force at zero compression就是预紧力