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