Let's quick revised what we have done in dom-1
SECTION-1 SECTION-2
CAMs Links And Mechanisms
Gears Velocity Analysis
Gear drive Acceleration Analysis 
Belt,Rope and Chain Drive Gyroscope

Now what you are going to learn in DOM-2 is

SECTION-1 SECTION-2
Balancing Force Analysis
Vibration Synthesis of Mechanisms

This syallabus is according to previous year it might be changed. Latest Syllabus will be given by respected sir.

All Materials are available at bottom part.

 Lets learn some of fundamentals of Balancing

Balancing 

A machine consists of a number of moving part. The motion of moving parts may be of rotary or reciprocating type. These m/c parts are subjected to different forces.

  1. Static Force: The static forces acting on the machine components are due to the weight of components.
  2. Inertia or Dynamic force: The inertia force is due to acceleration of various components or members of the m/c.

In comparison with the static forces, the dynamic forces are very large in magnitude. Balancing is the process of correcting or eliminating, either partially or completely. 

 The effects due to resultant inertia forces and couples acting on the machine parts. 


What is Static balancing?

The system is said to be statically balanced if the centre of mass (C. Cx. Of the system of masses lies on the axis of rotation. For the system to be statically balanced, the resultant of all the dynamic forces (centrifugal forces) acting on the system during rotation must be zero.

What is Dynamic Balancing?

The system is said to be dynamically (complete) balanced, if it satisfies following two condition.

  • The resultant of all the dynamic forces acting on the system during rotation must be zero.
  • The resultant couples due to all the dynamic forces acting on the system during rotation, about any plane must be zero.

Balancing of Rotating  System

In any rotating system, having one or more rotating masses, if the centre of mass of the system does not lie on the axis of rotation, then the system is unbalanced.

 The unbalanced in rotating system is mainly due to the following factors.

  • Errors and tolerances in manufacturing and assembly.
  • Non-homogeneity of material
  • Unsymmetrical shape of the rotors due to functional requirement

Which are the Topics to be covered in Balancing Chapter?

I'm giving topics list from SS Rattan Book. If you have not this Book. Download from here. Or Purchase from here.

Balancing : Topics From SS Rattan

  • Static Balancing
  • Dynamic Balancing
  • Transference of a Force from one plane to another
  • Balancing of Several Masses in Different Planes
  • Balancing of Reciprocating Mass
  • Balancing Of Locomotives
  • Effects of Partial balancing in Locomotives
  • Secondary Balancing
  • Balancing Of inline Engine (2,4,6 cylinder)
  • Balancing of V-Engines
This is based on my past experience, it might be chnaged. If sir covers topics other tha  these then you have to prepare that.

Chapter : Vibration

What is Vibration?
A body is said to vibrate if has a to-and-fro motion. When any elastic body such as spring, shaft or beam is displaced from the equilibrium position by application of external forces and then release if commences cyclic motion. Such cyclic motion due to elastic deformation under the action of external forces is known as vibration.

 Main Topics which are mostly to be covered in class and moslty asked in exam


  1. Types of Vibrations
  2. Basic features of Vibrating systems
  3. Degree of freedom
  4. Free longitudinal Vibration
  5. Displacement, Velocity and acceleration
  6. Inertia effect of the Mass of string
  7. Damped vibrations
  8. Logarithmic decrement
  9. Forced Vibrations
  10. Forced-damped Vibrations
  11. Magnification Factor
  12. Vibration isolation and Transmissibility

These topics are enough to get good marks in exam.

Force Analysis

  1. Static force analysis
  2. Dynamic force analysis

Synthesis of mechanisms

Actually in this section, prepared only what sir have done in class. Theory you can refer from Book.

Materials For DOM-2

SS Rattan Full Book in Pdf : Download
HOD Sir Class Note : Download


Theory of Machine Khurmi : Download
Buy Online SS Rattan : Click here

Video lectures : Click Here

Lab Practicals

All Lab Practicals : Click Here




Aakash Kavaiya
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