MechanismsA mechanism is an assembly of bodies moving relative to each other and according to predefined constraints. A mechanism includes specific elements (for example, bodies, joints, markers, and motion drivers) and unique mechanism features (for example, gravity). For more information, see About Mechanisms. Bodies are the elements to which you can assign mass properties. The bodies themselves can be rigid or rigid massless. For more information, see About Bodies. The bodies are connected to each other or to a global reference system by means of joints. The joints determine how the different bodies can move with respect to each other. The joint degrees of freedom are represented by a number of state variables that define the motion of the body. For more information, see About Joints. Markers are local coordinate systems associated with a body and used as coordinate reference to define joints, applied forces, and other elements. For more information, see About Markers. Workflow OverviewA 3DEXPERIENCE multibody system simulation typically consists of the following steps:
Example Use CasesMotion Analysis supports many use cases for general machinery applications (usually with complex geometries) comprised of rigid bodies that might include contact interaction, springs, and bushings, with joints connecting the bodies. The models are often fully parametrized product structures with predefined parts and engineering connections that convert automatically into bodies and joints. The applications include basic multibody system and do not consider advanced application-specific elements, such as tires, gear drives, or chain systems. . For these cases, you can use Motion Analysis to animate the kinematic or dynamic behavior of your system; to plot the position, velocity, acceleration of the bodies; and to study the forces acting in the drivers, joints, and machine elements or in a contact area. In the following example, a revolute joint is created automatically from engineering connections and existing axis systems; the pendulum is rotating around the z-axis of the highlighted axis system (). You can use Motion Analysis, for example, to add a force on the mechanical system and to study the impact of the force on the pendulum's free motion.
The following figure shows an example of a bottling line, where the contact between the bottles and the starwheels is studied. Another typical application is the study of elasto-kinematics for vehicle suspension: |