ANSYS的工作平面与坐标系.doc

工作平面WP与坐标系Cartesian的区别？如在建模area时，创建的area的位置随Workplane的改变而改变。回答：工作平面和坐标系是有区别的，同时通过一些操作也可以将两者联系其来。Working Plane 是一个2D作图平面，主要用于实体模型的定向和定位。Working Plane是一个无限大的平面，有原点、2D坐标系、捕捉增量和显示栅格。在同一时刻只能定义一个Working Plane。Working Plane与坐标系无关，是独立的，如工作平面与激活的坐标系可以有不同的原点和旋转方向。在进入ANSYS时，系统有一个默认的Working Plane，即Global Cartesion 的XY平面，Cartesion坐标系的X、Y轴就是该Working Plane的WX、WY轴。详细分析参下：4.2. Working Plane Enhancements4.2.5. Working Plane TrackingIf youve used working planes in conjunction with coordinate systems to define your geometry, youve probably discovered that working planes are completely separate from coordinate systems. When you change or move the working plane, for instance, the coordinate system does not change to reflect the new working plane type or location. This can be frustrating if you are using a combination of picking (based on the working plane), and keyboard input of entities such as keypoints (based on active coordinate system). For instance, if you move the working plane from its default position, then wish to define a keypoint at the new origin of the working plane with keyboard input (that is K,1205,0,0,0), youll find that the keypoint is located at the coordinate system origin rather than the working plane origin (see Figure 4.4: Working Plane/Coordinate System Mismatch)If you find yourself forcing the active coordinate system to follow the working plane around as you model, consider using an option on the CSYS command or GUI path to do this automatically. The command CSYS,WP or CSYS,4 will force the active coordinate system to be of the same system type (for example, Cartesian) and in the same location as the working plane. Then, as long as you leave the active coordinate system be WP or 4, as you move the working plane, the coordinate system will move with it. The coordinate system is also updated if you change the type of working plane that you are using. For instance, if you change the working plane from Cartesian to polar, the active coordinate system will change from Cartesian to cylindrical.To revisit the example discussed above, suppose that you wish to place a keypoint at the origin of your working plane after youve moved that plane. You moved your plane, as before, but this time you activated working plane tracking (CSYS,WP) before you moved the plane. Now, when you use the keyboard to locate your keypoint (that is K,1205,0,0,0), the keypoint is placed at the origin of the working plane because the coordinate system is in the same location as the working plane (see Figure 4.5: Matched Workin