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Characterization of a self-damped pendulum for vibration isolation
Aodren Vallat1, Yoav Naveh1, John Winterflood1
1ARC Centre of Excellence for Gravitational Wave Discovery, Department of Physics, University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia.
The Review of Scientific Instruments
|July 1, 2019
Summary
This study optimized "self-damping" for suspension chains in gravitational wave detectors. The technique uses cross-coupled orthogonal modes to dampen vibrations, improving seismic isolation for sensitive measurements.
Area of Science:
- Physics
- Mechanical Engineering
- Gravitational Wave Astronomy
Background:
- Sensitive measurement systems, like gravitational wave detectors, require multistage suspension chains for seismic isolation.
- These suspension chains often have high quality factor normal modes that necessitate damping.
Purpose of the Study:
- To investigate the performance of a single stage in low-loss, vacuum-compatible suspension chains.
- To optimize the "self-damping" technique for improved seismic isolation.
Main Methods:
- Engineered "self-damping" by viscously cross-coupling orthogonal modes of the same stage mass.
- Utilized numerical simulation to model the system's behavior.
- Conducted experimental measurements with varying damping parameters.
Main Results:
- Demonstrated the effectiveness of "self-damping" in reducing unwanted vibrations.
- Identified optimal damping parameters for the suspension chain stage.
- Validated simulation results with experimental data.
Conclusions:
- The "self-damping" technique is a viable method for damping normal modes in suspension chains.
- Optimized self-damping enhances seismic isolation in sensitive measurement systems.
- This research contributes to the development of more effective gravitational wave detectors.
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