Principles of Active Vibration Isolation Technology by Accurion

The impact of environmental disturbances, notably vibrations and acoustic noise, on research and production processes underscores the need for effective vibration control in ensuring the reliability of high-resolution measurements with sensitive instrumentation. This becomes particularly crucial when ambient vibration amplitudes align with the dimensions of the structures under investigation. Despite structural variations, passive vibration isolation systems, comprised of springs and dampers, function as mechanical low-pass filters to mitigate resonance frequencies and amplitude within specific ranges. However, addressing their limitations, such as low resonance frequencies and amplification in pneumatic systems, active vibration control (AVC) emerges as a solution. In AVC, signals from sensitive detectors are scrutinized by electronic circuitry, guiding electro-dynamic actuators to promptly generate a counter-force, eliminating resonance and amplification at any frequency. This distinguishing feature positions active vibration isolation systems as advantageous alternatives to their passive counterparts.

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The application and the carrying tabletop are supported by springs. The objective is to reach a floating condition as a requirement for active vibration isolation. Movements of the top plate in any direction are possible. During operation, the application on the tabletop is isolated from its environment.

Vibrations are detected by extremely sensitive piezoelectric accelerometers. Sensor output signals are analyzed and processed by a control circuit driving electro-dynamic actuators which generate a counter-force against vibrations in real-time. The active vibration isolation is effective at 6 degrees of freedom.

Key Features

  • No inherent low-frequency resonance, in contrast to air-damped systems, resulting in excellent vibration performance even within the low-frequency range.
  • Ultra-fast 0.3-second settling time (vs. 30s to 60s of typical passive isolators).
  • Active bandwidth extends from 0.6 / 1 Hz to 200 Hz, surpassing passive isolation limits.
  • Active vibration isolation in six degrees of freedom.
  • Instant generation of a counterforce for vibration compensation - genuine active vibration isolation.
  • Ease of use with push-button solution.
  • Compact design with minimal installation effort.
  • High position stability, typically 20 to 30 times stiffer than 1 Hz passive isolators.
  • No need for compressed air, just a power supply.
  • Ideal for isolating high-resolution measurement equipment from building vibrations.
  • Available in various standard versions and customizable options.