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A Vibrotactile Feedback Device for Seated Balance Assessment and Training
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High performance rotational vibration isolator.

Andrew Sunderland1, David G Blair, Li Ju

  • 1School of Physics, University of Western Australia, 35 Stirling Highway Crawley, WA 6009, Australia.

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Summary

A novel rotational vibration isolator with a low resonant frequency significantly reduces rotation noise, crucial for airborne mineral detection. This device achieves over 40 dB isolation in helicopter surveys, ideal for electromagnetic sensors.

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Area of Science:

  • Mechanical Engineering
  • Geophysics

Background:

  • Rotation noise is a significant challenge in airborne geophysical surveys.
  • Existing vibration isolation systems often have limitations in achieving very low resonant frequencies.

Purpose of the Study:

  • To introduce a new rotational vibration isolator with an extremely low resonant frequency.
  • To demonstrate its effectiveness in reducing rotation noise for airborne mineral detection.

Main Methods:

  • The isolator design features two concentric spheres separated by water and soft silicone springs.
  • Performance was evaluated in a helicopter survey, measuring isolation levels for rotational frequencies between 2 Hz and 20 Hz.

Main Results:

  • The isolator exhibits an extremely low resonant frequency of 0.055 ± 0.002 Hz.
  • Over 40 dB of isolation was achieved for rotations at frequencies from 2 Hz to 20 Hz.
  • The isolator's metal-free construction is suitable for electromagnetic sensors.

Conclusions:

  • The developed rotational vibration isolator effectively suppresses rotation noise in airborne surveys.
  • Its low resonant frequency and high isolation performance make it highly valuable for mineral exploration.
  • The design considerations, including translation-rotation coupling and temperature effects, are important for practical application.