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A parametric point (PP) is a subEntity used to reposition parameterized points. For example, when you create a cylinder, you set its starting point and end point with pre-defined PPs. If you modify the locations of these PPs, then the start and end points change accordingly.
Parametric points can also be used to modify the origin of a body. For example, the start point and end point of a cylinder model are set to PP_1stPointCylinder and PP_2ndPointCylinder, respectively. In addition, the origins of Body1 and Body2 are set to PP1 and PP2, respectively. In this example, you must declare three values (x, y, and z) as constants or parametric values (PVs) to define the PPs. When you use a PV, the PV can be either a constant or a short expression.
The following examples describe how you can define parametric points and parametric values:
- Set the numerical values in the x, y, and z components by typing, for example, PV1 = 100, 200, 300.
- Use arithmetic operations to define a PV by typing, for example, PV2 = 3-PV1.
- Use an expression to define a PV by typing, for example, PV3 = Ex1 (DX(Body1.MarkerOfBodyTip, Ground.BaseMarker)). (If the PV is defined as an expression, it does not change during the simulation. The initial value calculated during pre-analysis is applied as a constant throughout the entire simulation.)
- Use mathematical functions, such as SQRT, SIN, COS, or LOG, by typing, for example, PV = SQRT (2), which returns the square root of 2 (≒ 1.414).
- Use factors such as DTOR or RTOD by typing, for example, PV5 = 57 * DTOR. DTOR is a factor (≒ 0.01745) used to convert a value in degrees into a radian value. 57 * DTOR returns approximately 0.995 radians. RTOD returns the degree value of an angle in radians.
