devices for vibration isolation
TRANSCRIPT
BANGALORE INSTITUTE OF TECHNOLOGYDepartment of Mechanical Engineering
Post Graduate Studies
M. Tech in MACHINE DESIGNBatch-2014-2016
Mr. PRUTHVIRAJ A1BI14MMD08
Sep – Dec - 2014
Devices for vibrationIsolationMr. PRUTHVIRAJ A
1BI14MMD081st Semester
M. Tech in Machine Design
GuideDr. B. N. RAVIKUMAR
Professor, Department of Mechanical EngineeringBangalore Institute of Technology
Bangalore
BANGALORE INSTITUTE OF TECHNOLOGYDepartment of Mechanical Engineering
Post Graduate Studies
M. Tech in MACHINE DESIGNBatch-2014-2016
Mr. PRUTHVIRAJ A1BI14MMD08
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
BANGALORE INSTITUTE OF TECHNOLOGYDepartment of Mechanical Engineering
Post Graduate Studies
MTech in MACHINE DESIGNBatch-2014-2016
Mr. Pruthviraj A1BI14MMD08
Sep – Dec - 14
Transmissibility and Isolation
Fig.1: Frequency Response Curve
BANGALORE INSTITUTE OF TECHNOLOGYDepartment of Mechanical Engineering
Post Graduate Studies
M. Tech in MACHINE DESIGNBatch-2014-2016
Mr. PRUTHVIRAJ A1BI14MMD08
Sep – Dec - 2014
Vibration isolation Machine isolation
Base isolations
Isolation Systems Passive Systems
Active systems
Semi active systems
Vibration Isolation
BANGALORE INSTITUTE OF TECHNOLOGYDepartment of Mechanical Engineering
Post Graduate Studies
M. Tech in MACHINE DESIGNBatch-2014-2016
Mr. PRUTHVIRAJ A1BI14MMD08
Sep – Dec - 2014
Sources of vibration Examples
Rotating and reciprocatingUnbalance
Pumps, Turbines, Electric Generators,Compressors
Misalignment and wear of tools Manufacturing – machining
Seismic Vibrations Buildings, Bridges, Chimneys andCooling Towers
Wind (Pressure loading) Tall Structures
Small magnitude vibrationsE.g. Pedestal and vehicular traffic
Sensitive systems like opticalinstruments, microscopes,Nanofabrication
Impact and shock loads Hammer and presses, in vehicles due tobumpy/ irregular nature of road
BANGALORE INSTITUTE OF TECHNOLOGYDepartment of Mechanical Engineering
Post Graduate Studies
MTech in MACHINE DESIGNBatch-2014-2016
Mr. Pruthviraj A1BI14MMD08
Sep – Dec - 14
Passive devices Elastomeric Mounts
Isolation Pads
Pneumatic/air isolators
Metallic Springs
Viscous/ ViscoelasticDampers
Laminated RubberBearings
Friction Pendulum System
BANGALORE INSTITUTE OF TECHNOLOGYDepartment of Mechanical Engineering
Post Graduate Studies
M. Tech in MACHINE DESIGNBatch-2014-2016
Mr. PRUTHVIRAJ A1BI14MMD08
Sep – Dec - 2014
Isolation Pads and Mounts
Fig.2: Isolation Pads Fig.3: Elastomeric Mounts
BANGALORE INSTITUTE OF TECHNOLOGYDepartment of Mechanical Engineering
Post Graduate Studies
MTech in MACHINE DESIGNBatch-2014-2016
Mr. Pruthviraj A1BI14MMD08
Sep – Dec - 14
Metallic Springs and Wire Rope Isolator
Fig.4: Metallic Springs
Fig.5: Isolation HangersFig.6: Wire rope Isolator
BANGALORE INSTITUTE OF TECHNOLOGYDepartment of Mechanical Engineering
Post Graduate Studies
M. Tech in MACHINE DESIGNBatch-2014-2016
Mr. PRUTHVIRAJ A1BI14MMD08
Sep – Dec - 2014
Pneumatic Isolators
Fig.7: Air Springs
Fig.8: Air Table
BANGALORE INSTITUTE OF TECHNOLOGYDepartment of Mechanical Engineering
Post Graduate Studies
M. Tech in MACHINE DESIGNBatch-2014-2016
Mr. PRUTHVIRAJ A1BI14MMD08
Sep – Dec - 2014
Laminated Rubber Bearings
Fig 9: High Damping Rubber Bearing
Fig.10: Lead Rubber BearingFig.11: Use of Laminate Rubber Bearing in Buildings
BANGALORE INSTITUTE OF TECHNOLOGYDepartment of Mechanical Engineering
Post Graduate Studies
M. Tech in MACHINE DESIGNBatch-2014-2016
Mr. PRUTHVIRAJ A1BI14MMD08
Sep – Dec - 2014
Friction Bearings
Fig.12: Sliding Friction Bearing
BANGALORE INSTITUTE OF TECHNOLOGYDepartment of Mechanical Engineering
Post Graduate Studies
MTech in MACHINE DESIGNBatch-2014-2016
Mr. Pruthviraj A1BI14MMD08
Sep – Dec - 14
Active Systems Feedback systems
Works by applying
equal and opposite forces
Requires external powersource
Cost is higher
For sensitive instruments
Fig.13: Schematic of Active Vibration Control System
BANGALORE INSTITUTE OF TECHNOLOGYDepartment of Mechanical Engineering
Post Graduate Studies
MTech in MACHINE DESIGNBatch-2014-2016
Mr. Pruthviraj A1BI14MMD08
Sep – Dec - 14
Semi active devices Can control in real time
parameters of the structuresuch as spring stiffness ordamping
Examples Magneto rheological damper
systems
Electro rheological dampersystems
Shape memory alloy dampers
Fig.14: Magneto Rheological damper
BANGALORE INSTITUTE OF TECHNOLOGYDepartment of Mechanical Engineering
Post Graduate Studies
MTech in MACHINE DESIGNBatch-2014-2016
Mr. Pruthviraj A1BI14MMD08
Sep – Dec - 14
Dynamic Vibration Absorbers
Fig.15: Tuned Mass Damper inTaipei 101 Tower, Taiwan
Fig.16: Tuned Liquid Damper inOne Rincon Hill Building
BANGALORE INSTITUTE OF TECHNOLOGYDepartment of Mechanical Engineering
Post Graduate Studies
M. Tech in MACHINE DESIGNBatch-2014-2016
Mr. PRUTHVIRAJ A1BI14MMD08
Sep – Dec - 2014
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