Simulation Types - Analysis With Case Study
Motion study is a catch-all term for simulating and analyzing the movement of
mechanical assemblies and mechanisms. Traditionally, motion studies have been
divided into two categories: kinematics and dynamics. Kinematics is the study of
motion without regard to forces that cause it; dynamics is the study of motions that
result from forces. Other closely related terms for the same types of studies are
multibody dynamics, mechanical system simulation, and even virtual prototyping.
Kinematics:
Kinematics is the branch of classical mechanics which describes the motion of points, bodies
(objects), and systems of bodies (groups of objects) without consideration of the causes of
motion.Kinematics as a field of study is often referred to as the "geometry of motion".
Kinematic analysis is a simpler task than dynamic analysis and is adequate for many
applications involving moving parts. Kinematic simulations show the physical positions of all
the parts in an assembly with respect to the time as it goes through a cycle. This technology
is useful for simulating steady-state motion (with no acceleration), as well as for evaluating
motion for interference purposes, such as assembly sequences of complex mechanical
system. Many basic kinematic packages, however, go a step further by providing “reaction
forces,” forces that result from the motion.
Dynamics:
Every object experiences some form of motion which is the result of different forces acting
on the object. Dynamics is the study of the forces which are responsible for this motion.
Dynamic simulation is more complex because the problem needs to be further defined and
more data is needed to account for the forces. But dynamics are often required to accurately
simulate the actual motion of a mechanical system. Generally, kinematic simulations help
evaluate form, while dynamic simulations assists in analyzing function.
- Kinematics = Geometry of Motion
- Dynamics(“Kinetics”) = Geometry + Physics of Motion
Thus, as discussed above Kinematic mechanism has 0 degrees of freedom, where as dynamic mechanism has less or more than 0 degrees of freedom.
Hence as illustrated below with the help of model of simple crank mechanism-
Dynamic simulation- By intorducing translational type of joint at joint 3-
whereas, by eliminating the translational joint and intorducing inline type of joint the same dynamic mechanism turns in to kinematic type of mechanism, as shown below-
Thus, the model of simple crank mechanism used for this challenge is attached to the google drive, the link to which is given below.
https://drive.google.com/drive/folders/11u5QV8YLAcnJPPPqmcpdTuOzAeBDeT4U?usp=sharing