JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD

UNIT - I

Mechanisms & Machines: Elements of links – classification – rigid link, flexible and fluid link. Types of kinematic pairs – sliding, turning, rolling, screw and spherical pairs. Lower and higher pairs, closed and open pairs. Constrained motion – Completely, partially or successfully constrained, and incompletely constrained. Mechanism and machines – classification. Kinematic chain, inversion of mechanism, inversion of quadratic cycle. Chain – single and double slider crank chains. Exact and approximate straight line mechanisms - Peaucellier, Hart T. Chibichef, Pantograph.

UNIT - II

Kinematic Analysis of Mechanisms: Velocity and acceleration. Motion of link in machine – determination of velocity and acceleration diagrams – graphical method. Application of relative velocity method for four bar chain. Analysis of slider crank chain for displacement, Velocity and acceleration of sliding – Acceleration diagram for a given mechanism, Kleins construction, Coriolis acceleration, Determination of Coriolis component of acceleration.

UNIT - III

Plane Motion of Body & Gyroscopic Motion - Precession: Instantaneous centre of rotation, centroids and axodes – Relative motion between two bodies – Three centres in line theorem – Graphical determination of instantaneous centre, diagrams for simple mechanisms and determination of angular velocity of points and links. The gyroscope- free and restrained- working principle- the free gyro, rate gyro, integrating gyro as motion measuring instruments. Effect of precession on the stability of vehicles- motorbikes, automobiles, airplanes and ships. Static and dynamic forces generated due to in precession in rotating mechanisms.

UNIT - IV

Cams and Followers & Steering Gears: Cams and followers- definition uses – types– terminology. Types of follower motion- uniform velocity, simple harmonic motion and uniform acceleration. Maximum velocity and acceleration during outward and return strokes. Roller follower, circular cam with straight, concave and convex flanks. Condition for correct steering – Davis steering gear, Ackerman’s steering gear– Velocity ratio, Hook’s Joint– single and double Hooks joint– universal coupling– applications.

UNIT - V

Gears and Gear Trains & Design of Four Bar Mechanisms: Introduction to gears- types, law of gearing. Tooth profiles- specifications, classification- helical, bevel and worm gears, simple and reverted gear train, epicyclic gear trains- velocity ratio or train value. Four bar

R16 B.TECH AERONAUTICAL ENGG.

mechanism, Freudenstein equation. Precession point synthesis, Chebyshev’s method, structural error.

TEXT BOOKS:

• 1. Theory of Machines, Dr Jagdish Lal, JM Shaw.
• 2. Theory of Machines, Abdulla Sharif, Dhanpat Rai, 1987.
• 3. Theory of Machines, PL Ballaney, Khanna Publishers, 2003.

REFERENCES:

• 1. Theory of Machines Through Solved Problems, JS Rao / New Age – 1996
• 2. Mechanical engineering and design, J.E.Shigley and Charles.R.Mischke, TMH, 2003. R16 B.TECH AERONAUTICAL ENGG.