KINEMATICS OF MACHINES NPTEL PDF

Asok Kumar Mallik. The original name for this course is: Mechanical - Kinematics of Machines. JavaScript is not enabled in your browser! We strongly suggest you turn on JavaScript in your browser in order to view this page properly and take full advantage of its features. Course Subject: Mechanical Engineering Views: 68, Instructor Name Asok Kumar Mallik.

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You can change your ad preferences anytime. Module 1 introduction to kinematics of machinery. Upcoming SlideShare. Like this presentation? Why not share! Embed Size px. Start on. Show related SlideShares at end. WordPress Shortcode. Published in: Engineering. Full Name Comment goes here. Are you sure you want to Yes No. Anindya Bharat Swain , Student at c. Show More. No Downloads. Views Total views.

Actions Shares. Embeds 0 No embeds. No notes for slide. Module 1 introduction to kinematics of machinery 1. Uicker, , G. Pennock, J. Course Outcomes 4. Kinematic Chains and Inversions: Inversions of Four bar chain; Single slider crank chain and Double slider crank chain 6. Kinematic Link or Element Each part of a machine, which moves relative to some other part, is known as a kinematic link or simply link or element. Structure An assembly of a no. Examples: A railway bridge, a roof truss, machine frames.

Kinematic Pair The two links or elements of a machine, when in contact with each other, are said to form a pair, If the relative motion between them is completely or successfully constrained i. Completely constrained motion When the motion between a pair is limited to a definite direction irrespective of the direction of force applied, then the motion is said to be a completely constrained motion. Incompletely constrained motion When the motion between a pair can take place in more than one direction, then it can be an incompletely constrained motion.

These both motions have no relationship with the other automobile wheel. Successfully constrained motion When the motion between the elements, forming a pair, is such that the constrained motion is not completed by itself, but by some other means E. Classification of Kinematic Pairs 1.

Examples Lathe spindle supported in head stock. Spherical pair S When the two elements of a pair are connected in such a way that one element turns or swivels about the other fixed element. Eg: The ball and socket joint. Attachment of a car mirror. Pen stand. Screw pair When the two elements of a pair are connected in such a way that one element can turn about the other by screw threads. Cylindrical pair If the relative motion between the pairing elements is the combination of turning and sliding, then it is called as cylindrical pair.

Rolling Pair When the two elements of a pair are connected in such a way that one rolls over another fixed link. Lower pair When the two elements of a pair have a surface contact, and the surface of one element slides or rolls over the surface of the other. Classification of Kinematic Pairs 2. Higher pair When the two elements of a pair have a line or point contact, and the motion between the two elements is partly turning and partly sliding. According to the Mechanical arrangement.

Self closed pair When the two elements of a pair are connected together mechanically in such a way that only required relative motion occurs. Lower pairs are self closed pair. Force - closed pair When the two elements of a pair are not connected mechanically but are kept in contact by the action of external forces, the pair is said to be a force-closed pair. Cylindrical Pair C 2 5. Kinematic Chain When the kinematic pairs are coupled in such a way that the last link is joined to the first link to transmit definite motion i.

Degrees of freedom DOF In a kinematic pair, depending on the constraints imposed on the motion, the links may loose some of the six degrees of freedom. Find the Degrees of Freedom Types of Kinematic Chains 1. Four bar chain or quadric cyclic chain 2. Single slider crank chain 3. Double slider crank chain In Fig. The mechanism transforms rotary motion into oscillating motion. Purpose: Transmitting rotary motion from one wheel to the other wheel.

Purpose of this mechanism is to convert rotary motion into reciprocating motion. On displacement of the mechanism, the tracing point E at the end of the link CE traces out approximately a straight line. Single Slider Crank Chain When the crank link 2 is given a rotary motion, the connecting rod link 3 oscillates about a pin pivoted to the fixed link 4 at A.

The piston attached to the piston rod link 1 reciprocates. Pendulum Pump or Bull Engine Link 3 forming the turning pair is fixed and it corresponds to the connecting rod of a reciprocating steam engine mechanism. When the crank link 2 rotates, the piston attached to piston rod link 1 reciprocates and the cylinder link 4 oscillates about a pin pivoted to the fixed link at A A It consists of seven cylinders in one plane all revolve about fixed centre D.

Cylinders form link 1, Crank link 2 is fixed. When the connecting rod link4 rotates, the piston link 3 reciprocates inside the cylinder. Radial Engine A mechanism used in shaping and slotting machines, where the metal is cut intermittently. Double Slider Crank Chain Show that AP and BP are the semi-major axis and semi-minor axis of the ellipse. End of Module. You just clipped your first slide! Clipping is a handy way to collect important slides you want to go back to later. Now customize the name of a clipboard to store your clips.

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