Mechanical mates including cam-follower, gear, hinge, rack and pinion, screw, and universal joint, are essential for motion models yet extremely easy to create in CAD. Advanced mates provide additional ways to constrain or couple movements between bodies.
In addition to standard mates such as concentric and coincident, CAD (SolidWorks, for example) provides advanced and mechanical mates, as discussed in Chapter 4. It is extremely important to understand assembly mates in order to create successful motion models. In addition to a prescribed velocity, the motor may be used to drive a DOF at a prescribed displacement, either translational (using a linear motor) or rotational (using a rotary motor). This motor rotates the propeller at a prescribed angular velocity. For example, a rotary motor is created to drive the rotational DOF of the propeller in the engine example. Such a movement is either driven by a motor, resulting in a kinematic analysis, or determined by a force, leading to a dynamic analysis. In creating a motion model, instead of all movements being completely fixed, certain DOF (translational and/or rotational) are left to allow desired movement. Assembly constraints defined for the engine model (exploded view).
0 kommentar(er)
