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:
“The nearer a conception comes towards finality, the nearer does the dynamic relation, out of which this concept has arisen, draw to a close. To know is to lose.”
—D.H. (David Herbert)
“There is a concept that is the corrupter and destroyer of all others. I speak not of Evil, whose limited empire is that of ethics; I speak of the infinite.”
—Jorge Luis Borges (1899–1986)
“To find the length of an object, we have to perform certain
physical operations. The concept of length is therefore fixed when the operations by which length is measured are fixed: that is, the concept of length involves as much as and nothing more than the set of operations by which length is determined.”
—Percy W. Bridgman (1882–1961)