This document appears to be a student project report on vibration isolation. It was authored by Mr. Pruthviraj A, a student at Bangalore Institute of Technology pursuing an M.Tech in Machine Design. The report discusses various sources of vibration, approaches to vibration control including prevention, isolation, and absorption. It then describes different passive, active, and semi-active isolation devices in detail with examples, such as elastomeric mounts, springs, dampers, laminated rubber bearings, pneumatic isolators, and dynamic absorbers. Figures and diagrams are provided to illustrate many of the discussed vibration isolation systems. The report was supervised by Dr. B. N. Ravikumar of the Mechanical Engineering department

1. BANGALORE INSTITUTE OF TECHNOLOGY
Department of Mechanical Engineering
Post Graduate Studies
M. Tech in MACHINE DESIGN
Batch-2014-2016
Mr. PRUTHVIRAJ A
1BI14MMD08
Sep – Dec - 2014
Devices for vibration
Isolation
Mr. PRUTHVIRAJ A
1BI14MMD08
1st Semester
M. Tech in Machine Design
Guide
Dr. B. N. RAVIKUMAR
Professor, Department of Mechanical Engineering
Bangalore Institute of Technology
Bangalore

2. BANGALORE INSTITUTE OF TECHNOLOGY
Department of Mechanical Engineering
Post Graduate Studies
M. Tech in MACHINE DESIGN
Batch-2014-2016
Mr. PRUTHVIRAJ A
1BI14MMD08
Sep – Dec - 2014
 Modifying the source (Prevention)
 Balancing, Redesign of engines etc.
 Not always possible
 Choice based on cost and time
 Modifying system Parameters
 Use of Vibration Isolators
 Dynamic Vibration Absorbers
Approaches in Vibration Control

3. BANGALORE INSTITUTE OF TECHNOLOGY
Department of Mechanical Engineering
Post Graduate Studies
MTech in MACHINE DESIGN
Batch-2014-2016
Mr. Pruthviraj A
1BI14MMD08
Sep – Dec - 14
Transmissibility and Isolation
Fig.1: Frequency Response Curve

4. BANGALORE INSTITUTE OF TECHNOLOGY
Department of Mechanical Engineering
Post Graduate Studies
M. Tech in MACHINE DESIGN
Batch-2014-2016
Mr. PRUTHVIRAJ A
1BI14MMD08
Sep – Dec - 2014
 Vibration isolation
 Machine isolation
 Base isolations
 Isolation Systems
 Passive Systems
 Active systems
 Semi active systems
Vibration Isolation

5. BANGALORE INSTITUTE OF TECHNOLOGY
Department of Mechanical Engineering
Post Graduate Studies
M. Tech in MACHINE DESIGN
Batch-2014-2016
Mr. PRUTHVIRAJ A
1BI14MMD08
Sep – Dec - 2014
Sources of vibration Examples
Rotating and reciprocating
Unbalance
Pumps, Turbines, Electric Generators,
Compressors
Misalignment and wear of tools Manufacturing – machining
Seismic Vibrations Buildings, Bridges, Chimneys and
Cooling Towers
Wind (Pressure loading) Tall Structures
Small magnitude vibrations
E.g. Pedestal and vehicular traffic
Sensitive systems like optical
instruments, microscopes,
Nanofabrication
Impact and shock loads Hammer and presses, in vehicles due to
bumpy/ irregular nature of road

6. BANGALORE INSTITUTE OF TECHNOLOGY
Department of Mechanical Engineering
Post Graduate Studies
MTech in MACHINE DESIGN
Batch-2014-2016
Mr. Pruthviraj A
1BI14MMD08
Sep – Dec - 14
Passive devices
 Elastomeric Mounts
 Isolation Pads
 Pneumatic/air isolators
 Metallic Springs
 Viscous/ Viscoelastic
Dampers
 Laminated Rubber
Bearings
 Friction Pendulum System

7. BANGALORE INSTITUTE OF TECHNOLOGY
Department of Mechanical Engineering
Post Graduate Studies
M. Tech in MACHINE DESIGN
Batch-2014-2016
Mr. PRUTHVIRAJ A
1BI14MMD08
Sep – Dec - 2014
Isolation Pads and Mounts
Fig.2: Isolation Pads Fig.3: Elastomeric Mounts

8. BANGALORE INSTITUTE OF TECHNOLOGY
Department of Mechanical Engineering
Post Graduate Studies
MTech in MACHINE DESIGN
Batch-2014-2016
Mr. Pruthviraj A
1BI14MMD08
Sep – Dec - 14
Metallic Springs and Wire Rope Isolator
Fig.4: Metallic Springs
Fig.5: Isolation Hangers
Fig.6: Wire rope Isolator

9. BANGALORE INSTITUTE OF TECHNOLOGY
Department of Mechanical Engineering
Post Graduate Studies
M. Tech in MACHINE DESIGN
Batch-2014-2016
Mr. PRUTHVIRAJ A
1BI14MMD08
Sep – Dec - 2014
Pneumatic Isolators
Fig.7: Air Springs
Fig.8: Air Table

10. BANGALORE INSTITUTE OF TECHNOLOGY
Department of Mechanical Engineering
Post Graduate Studies
M. Tech in MACHINE DESIGN
Batch-2014-2016
Mr. PRUTHVIRAJ A
1BI14MMD08
Sep – Dec - 2014
Laminated Rubber Bearings
Fig 9: High Damping Rubber Bearing
Fig.10: Lead Rubber Bearing
Fig.11: Use of Laminate Rubber Bearing in Buildings

11. BANGALORE INSTITUTE OF TECHNOLOGY
Department of Mechanical Engineering
Post Graduate Studies
M. Tech in MACHINE DESIGN
Batch-2014-2016
Mr. PRUTHVIRAJ A
1BI14MMD08
Sep – Dec - 2014
Friction Bearings
Fig.12: Sliding Friction Bearing

12. BANGALORE INSTITUTE OF TECHNOLOGY
Department of Mechanical Engineering
Post Graduate Studies
MTech in MACHINE DESIGN
Batch-2014-2016
Mr. Pruthviraj A
1BI14MMD08
Sep – Dec - 14
Active Systems
 Feedback systems
 Works by applying
 equal and opposite forces
 Requires external power
source
 Cost is higher
 For sensitive instruments
Fig.13: Schematic of Active Vibration Control System

13. BANGALORE INSTITUTE OF TECHNOLOGY
Department of Mechanical Engineering
Post Graduate Studies
MTech in MACHINE DESIGN
Batch-2014-2016
Mr. Pruthviraj A
1BI14MMD08
Sep – Dec - 14
Semi active devices
 Can control in real time
parameters of the structure
such as spring stiffness or
damping
 Examples
 Magneto rheological damper
systems
 Electro rheological damper
systems
 Shape memory alloy dampers
Fig.14: Magneto Rheological damper

14. BANGALORE INSTITUTE OF TECHNOLOGY
Department of Mechanical Engineering
Post Graduate Studies
MTech in MACHINE DESIGN
Batch-2014-2016
Mr. Pruthviraj A
1BI14MMD08
Sep – Dec - 14
Dynamic Vibration Absorbers
Fig.15: Tuned Mass Damper in
Taipei 101 Tower, Taiwan
Fig.16: Tuned Liquid Damper in
One Rincon Hill Building

15. BANGALORE INSTITUTE OF TECHNOLOGY
Department of Mechanical Engineering
Post Graduate Studies
M. Tech in MACHINE DESIGN
Batch-2014-2016
Mr. PRUTHVIRAJ A
1BI14MMD08
Sep – Dec - 2014
THANK YOU