Syllabus – SNS Courseware

23MET204- Mechanics of Machines

23MET204			MECHANICS OF MACHINES	L	T	P		J	C
IV SEM				3	0	0		0	3
COURSE OBJECTIVE The course will enable the students
1		Familiarize with the terminology and classification of mechanisms.
2		Develop the velocity and acceleration for simple mechanisms and cam profile for various types of followers.
3		Determine the contact ratio of gear trains and familiarize with gyroscopes
4		Perform static and dynamic force analysis of planar mechanisms.
5		Identify sources and effect of unbalance in rotating systems and Model and analyze vibration systems.
UNIT I		Mechanisms and Kinematics					10
Introduction, mechanisms and machines, terminology, planar mechanism – Kinematic diagram and inversion, Mobility, Coincident joints, Grubbler and GrashoffÙs law, Four bar, single and double slider mechanisms and their inversions. Construction of velocity and acceleration diagram by graphical method (Relative Velocity Method), Four bar mechanism, slider crank mechanisms
UNIT II		CAM Design					8
Cam terminology, types of cams and followers, Types of follower motion and its derivatives, under cutting, Displacement, velocity and acceleration for different follower motion, Tutorial on construction of cam profile for radial follower with different motion, Tutorial on construction of cam profile for offset follower, with different motion, Cams with special contours, Tutorial on velocity and acceleration for cams with specified contours.
UNIT III		Gear, Gear Trains and Gyroscopes					9
Gear: terminology, fundamental of gearing, involute profile, interference and undercutting, minimum number of teeth, contact ratio – Gear trains: simple, compound and epicyclic. Introduction to automobile differential, Gyroscopic forces, couple, processional angular motion, Gyroscopic effects on airplane and ship, Tutorial on gyroscopic effect on four wheelers.
UNIT IV		Dynamic Force Analysis					9
Introduction-DÙ AlembertÙs principle-static and inertial force analysis of reciprocating engine Equivalent dynamic system. Turning moment diagram-four stroke engine-multicylinder engine-design of flywheel of IC engine-design of flywheel rim.
UNIT V		Balancing and Vibration					9
Static and dynamic balancing, Balancing of single rotating and many rotating masses by another mass in one plane. Introduction to vibration – Terminologies – Single degree of freedom- damped and undammed- free and forced vibration Ó Vibration isolation and Transmissibility. Transverse vibrations of shafts Ó Whirling of shaft -Torsional vibration of single rotor and two rotorsÙ systems.
L:45 T:0 TOTAL: 45 PERIODS
TEXT BOOKS
1.		Khurmi, R.S., ÝTheory of MachinesÝ, 14th Edition, S Chand Publications, Chennai, 2016
2.		Rattan, S.S, ÜTheory of MachinesÝ, 3rd Edition, Tata McGraw-Hill, New Delhi, (2016)
REFERENCES
1.		Joseph Edward Shigley and John Joseph Uicker Jr., Theory of Machines and Mechanisms SI Edition, 2014, Oxford University Press
2.		Norton R. L, Kinematics and Dynamics of Machinery, , 2017, McGraw-Hill Education
3.		Shigley, ÜTheory of MachinesÝ, Tata McGraw Hill, 6th Edition, (2013).
4.		Thomas Bevan, ÜTheory of MachinesÝ, 3rd Edition, CBS Publishers and Distributors (2011)
5.		Sadhu Singh ÜTheory of MachinesÝ Pearson Education, Chennai, 2014
WEB RESOURCES
1.		http://nptel.ac.in/courses/112104121/
2.		https://nptel.ac.in/courses/112/104/112104122/
3.		https://books.google.co.in/books?uid=Machinery
COURSE OUTCOME At the end of the course the students will be able to
CO-1	Examine the kinematic behaviour of various planar mechanisms. Construct velocity and acceleration diagrams for various planar mechanisms.
CO-2	Construct and analyze cam profiles for the various motions of the follower.
CO-3	Assess the characteristics of gear-train mechanisms and gyroscopic effects
CO-4	Investigate the dynamic forces acting on planar mechanisms .Construct turning moment diagrams for two and four stroke engines to evaluate the flywheel mass.
CO-5	Analyse the balancing of masses and vibrations of mechanical systems.