是個能夠做附力葉分解動作相當有用的一套程式碼希望能有所幫助-Is a force can do is attached leaf decomposition action of a set of very useful code hope to be helpful

本程序为第四章的第二个算例，采用三角形单元计算隧道在自重作用下的变形和应力-Tunnel under the action of gravity in the deformation and stress

利用微分法将轨道根数求卫星位置速度,并画含有地球模型的动图-Using the differential method to track the number of required satellite position, velocity, and painted action figure containing Earth Model