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Massachusetts Institute Of Technology Vibration Isolated Inertia Block

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QSG is a Chief Engineering Scientist, Consulting Engineer, Research Scientist, Noise and Vibration Control Specialist, Acoustics, Structural And Machinery Dynamics, Noise And Vibration Control, And Stress Analysis Consultant with world-class expertise in structureborne sound, structural and machinery dynamics, noise and vibration control, and stress analysis.

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The MIT/Harvard Center for Magnetic Resonance plans called for the installation of a 900 MHz Nuclear Magnetic Resonance (NMR) device. Unfortunately, a very large generator next door produced a narrow-band vibration peak at 28 Hz that exceeded the NMR's vibration criterion.

This consultant surveyed the floor vibrations and determined ways to reduce the vibrations to acceptable levels, considering that potential solutions had to accommodate the NMR's own internal vibration isolation system.

This consultant determined that the generator-induced vibrations could be reduced to acceptable levels using high-performance commercial air spring isolators (natural frequencies: 1.5 Hz vertical, 1.2 Hz horizontal). We recommended an 80,000 pound inertia block to dynamically separate the primary isolation system from the NMR isolators, thereby minimizing adverse interactions between the two isolation systems.

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The above photo shows the underside of the block with the air spring isolators; the photo below shows the top surface of the block where the NMR is now located. At the generator's operating frequency, the system attenuates the floor vibrations by 45 db, allowing the researchers to use the NMR even while the generator is in service.

figures

Read other articles by this KKAI Associate:

Brain And Cognitive Sciences Project Rail vibration, Transfer mobility testing

New York Structural Biology Center Vibration Measurements and Analysis

National Institute Of Standards And Technology

Beth Israel Deaconess Medical Center Vibration survey and analysis

National Neuroscience Research Center Vibration Analysis

Chief Engineering Scientist, Consulting Engineer, Research Scientist, Noise and Vibration Control Specialist, Acoustics, Structural And Machinery Dynamics, Noise And Vibration Control, And Stress Analysis Consultant, structureborne sound, structural and machinery dynamics, noise and vibration control, and stress analysis.
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Kevin Kennedy & Associates, Inc.
Rapid Response Engineering® Solutions
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Indianapolis, Indiana 46268
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