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Transient and Steady-state Response01:24

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493
In control systems, test signals are essential for evaluating performance under various conditions. The ramp function is effective for systems undergoing gradual changes, while the step function is suitable for assessing systems facing sudden disturbances. For systems subjected to shock inputs, the impulse function is the most appropriate test signal.
These test signals are integral in designing control systems to exhibit two key performance aspects: transient response and steady-state...
493

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Development of a transient thrust stand with sub-millisecond resolution.

C Spells1, A Craig1, A Ketsdever1

  • 1Department of Mechanical and Aerospace Engineering, University of Colorado Colorado Springs, Colorado Springs, Colorado 80918, USA.

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|October 3, 2019
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Summary

A novel transient thrust stand achieves 0.1 ms time-resolved force measurements up to 22 N. This advanced system accurately captures dynamic thrust profiles, overcoming limitations of existing measurement technologies.

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Area of Science:

  • Aerospace Engineering
  • Mechanical Engineering
  • Instrumentation and Measurement

Background:

  • Accurate measurement of transient thrust is critical for rocket and spacecraft propulsion system development.
  • Existing thrust stands often lack the necessary time resolution or force capacity for characterizing dynamic thrust events.
  • High-frequency vibration modes and external noise can significantly impact measurement accuracy.

Purpose of the Study:

  • To develop and validate a transient thrust stand capable of high-time-resolution force measurements.
  • To achieve accurate dynamic thrust profiles with minimal error and high frequency response.
  • To overcome the limitations of current thrust measurement technologies in terms of speed and force range.

Main Methods:

  • Development of a transient thrust stand with a torsional configuration for vibration isolation.
  • Implementation of a predictor-based subspace system identification (PBSID) algorithm to model high-frequency vibration modes.
  • Utilization of an augmented Kalman filter (AKF) to fuse data from accelerometers, velocity sensors, and displacement transducers.
  • Integration of PBSID and AKF to attenuate external noise and enhance measurement accuracy from 0 kHz to 10 kHz.

Main Results:

  • The developed transient thrust stand provides 0.1 ms time-resolved force measurements up to 22 N.
  • Dynamic thrust profiles were obtained with less than 5% error.
  • The system demonstrated a measurement capability from 0 kHz to 10 kHz, surpassing existing technologies.
  • Effective attenuation of external noise sources was achieved through the combined AKF and PBSID model.

Conclusions:

  • The novel transient thrust stand successfully meets the need for high-speed, high-force thrust measurements.
  • The system's unique combination of PBSID and AKF enables accurate dynamic thrust characterization.
  • This technology represents a significant advancement in propulsion system testing and analysis.