如何控制弹簧拉伸的 时候不起作用
在adams/view中需要使用一个FD-Damper，如何控制这个FD-Damper只在压缩的时候起作用呢？data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAASIAAACxCAIAAADvWSe4AAAEeUlEQVR4nO3dXXLTMACFUe9/U2yNh85kMoni2Jauo59znoCpJUvqB8FtYPsHhG2/vgGYn8wgTmYQJzOIkxnEyQziZAZxMoM4mUGczCBOZhAnM4iTGcTJDOJk1rtt247/lD45pN49h/Ty4z+/uCnOcUi9e4RULEpmQ3BIvfsL6VNOMhuCQ+rd/otDmQ3BIfXOi8YJOKTefXoE8ulX6JBD6p0H+hNwSL3b/xNMZkNwSBAnM4iTGcTJDOJkBnEyi4g+APR0cTgOrL3970L**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
用force来模拟弹簧，用个if函数即可
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