Basic mechanical engineering

Basic Mechanical Engineering

Element or Kinematic Link:

                              Each part of machine which is move relative to other part of the machine is called Element or kinematic link or simple link. A link may consists of machine can made of several rigid parts which have no relative motion 

Important things for Link:

1. A link should be a resistive body.
2. A link should have relative motion.

Types of link

There are three types of Link these are:.............................

• Rigid link:

                  A rigid link is that which does not undergo any deformation when it transform the motion in short rigid body does not exist................. hard roads and crack are the example of
  the rigid body
  

  Flexible link:

                  A flexible link is that which partly deformed when the relative motion is transmit.................... for example belt ropes and chain are the example of the flexible link
  

  Fluid link :

                       A fluid link is one which completely deformed by fluid in pipes in this motion is transfer by the pressure and compression .. For example jacks hydrolic breaks are the example of the fluid link.
  
  

  What is a Structure?

                       It is the assemblage of the unknown  number of resistive body
                       it have no relative motion between the parts of structure
  For example: railway line pull etc.

  What is a machine?

  It is the combination of known number of links which have 
  relative motion between them in a machine energy is transfer in to
  useful work

  Difference between Structure and machine

  1. In machine each link has relative motion between them while the member of the structure have no relative motion between them.
  2. In machine energy can be transfer into useful work and in structure no energy can transfer into useful work.
  3. the link may transfer both work and motion between them and the members of the structure can transfer only force.