MECHANICAL VIBRATIONS ME 65

1
MECHANICAL VIBRATIONS(ME 65)

• Session 1
• Dr. P.DINESH
• SAMBHRAM INSTITUTE OF TECHNOLOGY
• BANGALORE

2
In Session 1

• Reference books
• Definition of vibration
• Causes and effects
• Definitions of various terms in Vibration
  
• and types of vibrations

3
Additional References

• Mechanical Vibrations ,Grover. G.K . , Nemchand
  and Bros. Roorkee
• Mechanical Vibrations, V.P.Singh, Dhanpat Rai
  and Co., Delhi.
• Mechanical Vibrations, J.B.K. Das and P.L.
  Srinivasamurthy, Sapna book House, Bangalore.
• Vibrations and Noise for Engineers, K. Pujara,
  Dhanpat Rai and Sons, New Delhi.

4
Definition of Vibration

• Vibration is defined as a motion which repeats
  after an equal interval of time
• Example Motion of a Simple Pendulum, Machine
  tool vibrations, tuning fork , vibrations of
  strings of musical instruments.

5
Causes and Effect

• Causes
• Unbalanced force in rotating machines
• Elasticity and mass of system
• External application of force
• Friction between bodies
• Earthquakes, winds etc.,
• Effects
• Vibrations induce high stresses are undesirable
• Vibrations are also useful

6
Definitions of Various terms in Vibrations

• Time period/Natural frequency/Amplitude
• Components of a vibrating system-mass,spring,dampe
  r
• Degree of Freedom(DOF)
• Simple Harmonic Motion (SHM),
• Damping
• Free vibration /Forced vibration

7
Definitions of Various terms in Vibrations
.(contd.)

• Linear vibrations Principle of superposition
• Non Linear vibrations large amplitudes
• Damped and Undamped vibrations
• Longitudinal vibrations
• Transverse vibrations
• Torsional vibrations

8
Conclusion - Session 1

• Definition of vibration
• Causes and effects
• Definitions of various terms