Devices for vibration isolation
- 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