Triaxial Vibration Measurement System for UAVs

Project name: Triaxial Vibration Measurement System for UAVs

A research institute has deployed the customized RU-846 Rugged Data Recorder from Dynatronic to perform triaxial vibration measurements on critical components of unmanned aerial vehicles (UAVs), such as motor mounts, flight control compartments, and arm connections. The system transmits user-defined vibration characteristic values in real time to ground storage devices via RS-422 communication.

1. Core System Features

• Triaxial Synchronized Acquisition
  Built-in 3-channel IEPE accelerometer interfaces for synchronous X/Y/Z-axis vibration measurement (±50g range, 0.5-5kHz bandwidth)

• Real-Time Feature Extraction
  On-the-fly computation of RMS values, peak frequencies, kurtosis coefficients, and other key metrics, transmitted via 422 bus at 1kHz rate

• Dual-Storage Redundancy
  Local TF card stores raw waveforms (24-bit/20kHz sampling), while ground stations receive feature parameters (JSON format)

2. Technical Implementation

Sensor Deployment

• Triaxial MEMS accelerometers installed with silicone isolation (weight <10g)

• Powered by avionics system (9-36VDC wide-range input)

Data Transmission Architecture

• Sensors → RU-846 (FFT preprocessing) → RS-422 → Ground industrial computer (SQLite database)

Anti-Interference Design

• Aviation-grade locking connectors

• Digital filtering (adaptive notch filtering for rotor harmonic suppression)

3. Typical Test Scenarios

• Powertrain Testing
  Order analysis during motor start/stop (0-1000Hz frequency sweep)

• Maneuver Load Monitoring
  Vibration vector synthesis during sharp turns/climbs (3-axis time-frequency joint analysis)

• Structural Resonance Detection
  Early warning for blade-pass frequency and airframe modal coupling

4. Extended Applications

• Integration with Flight Control Data
  Automatic flight mode downgrade upon vibration threshold exceedance

• Digital Twin Validation
  Updating finite element models with real-world measurement data

Conclusion
The triaxial vibration measurement system provides UAV engineers with high-precision, real-time insights into structural and powertrain dynamics. By combining synchronous multi-axis acquisition, on-the-fly feature extraction, and robust data transmission, the system enables proactive detection of potential resonance or fatigue issues. These capabilities support safer UAV operation, validate digital twin models, and enhance design optimization for next-generation unmanned aerial vehicles.