如何提高测试精度是主轴静刚度测试中的难点。
It's difficult to improve the precision of the spindle static stiffness test.
搭建药物驱动装置的压缩弹簧刚度测试试验台，得到了较为精确的弹簧刚度值。
Stiffness test platform of drug drive compression spring was built and the relative accurate stiffness value was got.
方法：根据脊柱3轴6自由度运动原理，制作活体颈椎三维运动和刚度测试装置。
Methods a device that measures the three-dimensional motion and stiffness of the cervical spine in vivo was designed according to 3-dimensional 6-degree of freedom motion principle of spine.
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