DEPARTMENT OF MECHANICAL ENGINEERING

NARASARAOPETA ENGINEERING COLLEGE (NEC), NARASARAOPET

Subject: DYNAMICS OF MACHINERY

Year: III/IV –Ist sem

Course Objectives:

1.  To equip the student with fundamental knowledge of dynamics of machines so that student can appreciate problems of dynamic force balance, transmissibility of forces, isolation of systems, vibrations.

2.  Develop knowledge of analytical and graphical methods for calculating balancing of rotary and reciprocating masses.

3.  Develop understanding of vibrations and its significance on engineering design.

4.  Develop understanding of dynamic balancing, flywheel analysis, gyroscopic forces and moments.

Lesson Plan

Lecture
Number / TITLE OF THE TOPIC / Remarks
UNIT-I-PRECESSION
1 / Introduction to precession gyroscopes and its effects
2 / The effect of precession motion on the stability of moving vehicles
3 / Gyroscopic effect on motor car and derivations
Numerical problems on motor car
4 / Tutorial-1
5 / Gyroscopic effect on motor cycle
Numerical problems on motor cycle
6 / Gyroscopic effect on aero planes & Numerical problems on aero planes
7 / Gyroscopic effect on ships
Numerical problems on ships
8 / Tutorial-2
UNIT-II
FRICTION:
9 / Introduction to friction and its effect on inclined plane
Briefing of friction between screw and nut & Numerical problems on friction between screw and nut
10 / Briefing of friction in pivot and collar and effect of uniform pressure and uniform wear on it
Numerical problems on friction in pivot and collar
11 / About friction circle and friction axis,
Usage of lubricated surfaces and film lubrication, theory of boundary friction
12 / Tutorial-3
CLUTCHES:
13 / Introduction to various friction clutches
Theory of single disc or plate clutch
Numerical problems on single disc or plate clutch
14 / Theory of multiple disc clutch and Numerical problems on it.
Theory of cone clutch and Numerical problems on it.
Theory of centrifugal clutch and Numerical problems on it.
BRAKES AND DYNAMOMETERS:
15 / Introduction to brakes and about simple block brakes
Numerical problems on simple block brakes
16 / Tutorial-4
17 / Introduction to internal expanding brake and band break of vehicle,
General description and operation of dynamometers ,Introduction to Prony and Rope brake dynamometers
18 / Numerical problems on Prony and Rope brake dynamometers
Description of Epicyclic, Bevis Gibson and belt transmission.
UNIT-III-TURNING MOMENT DIAGRAMS
19 / Dynamic force analysis of slider crank mechanism
20 / Tutorial-5
21 / Introduction to inertia torque, angular velocity and acceleration of connecting road
22 / Introduction to crank effort and turning moment diagrams & Numerical problems on crank effort
23 / Description of flywheels and their design
24 / Tutorial-6
25 / Numerical problems on flywheels
UNIT-IV- GOVERNORS
26 / Introduction to Governors and its principle
27 / Construction of watt and porter governor
28 / Tutorial-7
29 / Numerical problems on watt and porter governor
30 / Construction of proell and spring loaded governors
Numerical problems on proell and spring loaded governors
31 / Construction of Hartnell and Hartung with auxiliary springs
32 / Theory of Sensitiveness, Isochronism and Hunting
33 / Tutorial-8
UNIT-V- BALANCING
34 / Introduction to balancing of rotating masses in single and different planes
35 / Numerical problems on balancing of rotating masses by using analytical and graphical methods
36 / Theory of primary, secondary, and higher balancing of reciprocating masses.
37 / Tutorial-9
38 / Numerical problems on balancing of reciprocating masses.
39 / Theory of multi cylinder inline and radial engines for primary and secondary balancing.
40 / Briefing of locomotive balancing and Hammer blow
41 / Tutorial-10
42 / Briefing of swaying couple and variation of tractive effort.
UNIT-VI-VIBRATIONS
43 / Introduction to free vibration of spring mass system-oscillation of pendulums
44 / Theory of transverse loads, vibrations of beams with concentrated and distributed loads.
Dunkerly’s & Raleigh’s methods
45 / Tutorial-11
46 / Concept of whirling of shafts, critical speeds
Theory of Torsional vibrations, two and three rotor systems
47 / Simple problems on Forced damped vibration
Theory of vibration isolation transmissibility
48 / Tutorial-12

REFERENCES:

1.  Theory of Machines / S.S Ratan/ Mc. Graw Hill Publ.

2.  Theory of machines / Khurmi/S.Chand.

Course outcomes:

Upon successful completion of this course the student should be able to:

1.  Analyze stabilization of sea vehicles, aircrafts and automobile vehicles.

2.  Compute frictional losses, torque transmission of mechanical systems.

3.  Analyze dynamic force analysis of slider crank mechanism and design of flywheel.

4.  Understand how to determine the natural frequencies of continuous systems starting from the general equation of displacement.

5.  Understand balancing of reciprocating and rotary masses.