Concept
A body is usually considered to be a rigid or flexible part of a mechanical system (not to be confused with the human body). An example of a body is the arm of a robot, a wheel or axle in a car or the human forearm. A link is the connection of two or more bodies, or a body with the ground. The link is defined by certain (kinematical) constraints that restrict the relative motion of the bodies. Typical constraints are:
- spherical joint; constrains relative displacements in one point, relative rotation is allowed; implies 3 kinematical constraints
- revolute joint; only one relative rotation is allowed; implies 5 kinematical constraints; see the example above
- prismatic joint; relative displacement along one axis is allowed, constrains relative rotation; implies 5 kinematical constraints
- cardan joint; 4 kinematical constraints
There are two important terms in multibody systems: degree of freedom and constraint condition.
Read more about this topic: Multibody System
Famous quotes containing the word concept:
“Revolution as an ideal concept always preserves the essential content of the original thought: sudden and lasting betterment.”
—Johan Huizinga (1872–1945)
“The two most far-reaching critical theories at the beginning of the latest phase of industrial society were those of Marx and Freud. Marx showed the moving powers and the conflicts in the social-historical process. Freud aimed at the critical uncovering of the inner conflicts. Both worked for the liberation of man, even though Marx’s concept was more comprehensive and less time-bound than Freud’s.”
—Erich Fromm (1900–1980)
“Terror is as much a part of the concept of truth as runniness is of the concept of jam. We wouldn’t like jam if it didn’t, by its very nature, ooze. We wouldn’t like truth if it wasn’t sticky, if, from time to time, it didn’t ooze blood.”
—Jean Baudrillard (b. 1929)