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Fly-by-Pi: Open source closed-loop control for geotechnical centrifuge testing applications.

André Broekman1, Schalk Willem Jacobsz1, Hendrik Louw1

  • 1Department of Civil Engineering, University of Pretoria, Pretoria, South Africa.

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Summary
This summary is machine-generated.

This study introduces Fly-by-Pi, a low-cost, open-source system using Raspberry Pi for controlling geotechnical centrifuge experiments. It offers a versatile alternative to expensive, proprietary systems for advanced soil behavior modeling.

Keywords:
Cave miningControllerPhysical modellingPilesPythonRaspberry PiSoil-structure interaction

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Area of Science:

  • Geotechnical Engineering
  • Soil Mechanics
  • Experimental Physics

Background:

  • Geotechnical centrifuges enable cost-effective physical modeling of complex soil behaviors under high stress.
  • Existing centrifuge hardware often relies on expensive, closed-source data acquisition and control systems.
  • There is a need for accessible, adaptable control solutions for advanced geotechnical testing.

Purpose of the Study:

  • To develop and demonstrate a novel, low-cost, open-source data logger and control system for geotechnical centrifuges.
  • To provide a versatile system capable of closed-loop control for linear actuators in demanding experimental conditions.
  • To encourage the adoption of open-source hardware in extreme testing environments.

Main Methods:

  • Development of the Fly-by-Pi system utilizing a Raspberry Pi microcomputer.
  • Implementation of closed-loop control for linear actuators, supporting cyclic, monotonic, and static loading/displacement.
  • Integration and testing of the Fly-by-Pi system in three independent geotechnical centrifuge experiments.

Main Results:

  • The Fly-by-Pi system successfully operated in parallel with existing centrifuge hardware.
  • The system demonstrated versatility in controlling actuators and adaptability for reprogramming during experiments.
  • Successful application in three distinct experimental scenarios validated the system's performance.

Conclusions:

  • The Fly-by-Pi system presents a viable, low-cost, open-source alternative for geotechnical centrifuge control.
  • Open-source hardware solutions offer significant advantages in terms of cost, versatility, and adaptability for extreme testing.
  • Widespread adoption of such systems can democratize advanced geotechnical research and development.