BACKGROUND: Pedicle screw which passes through the three columns and has three-dimensional correction function, which has quickly become the standard posterior spinal internal fixation.
背景：椎弓根螺钉贯穿脊柱前中后三柱，具有三维矫正作用，已成为标准的脊椎后路内固定方法。
Based on the INS error correction by quasi-three dimensional model, the method of the combination of camera imaging system with SINS to deduce the measurement matrix was utilized.
文中基于准三维模型对惯导系统误差校正的思想，利用摄像机成像系统和捷联惯导系统（SINS）相结合的方法，着重对量测矩阵进行推导。
The SIF and its correction factor of the transverse surface semi-elliptic crack of a photoelastic axle are tested and studied with the method of three dimensional photo-elastics.
通过三维光弹实验测定了轴表面横向半椭圆裂纹的应力强度因子（SIF），并计算了与光弹轴裂纹几何及当地应力相对应的无限大体的SIF，从而求得SIF修正系数。
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