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Rocket Engine Thrust Force Measurement

How to Measure Axial Thrust Using a Load Cell

A propulsion development facility specializing in liquid-propellant rocket engines required high-fidelity thrust measurement during static fire testing. These environments combine cryogenic fluids (LOX) with extreme exhaust plume temperatures, creating severe thermal gradients, vibration, and dynamic loading. Accurate force measurement under transient conditions is critical for engine validation, combustion stability analysis, and mission modelling.

Desafío

The engineering team faced instability in thrust data due to thermal drift, vibration-induced noise, and rapid load transients during ignition and shutdown. Conventional sensors struggled with:

  1. Extreme Temperature-Induced Shift: Zero shift and sensitivity variation across hot and cryogenic zones.
  2. High-Frequency Dynamic Loading: During transient thrust phases.
  3. Signal Degradation: In harsh electromagnetic and thermal environments, common in test stands.
These factors resulted in inconsistent thrust curves, limiting the reliability of propulsion modelling and increasing test iteration cycles.

Solución

The facility deployed a customized and specially calibrated ANYLOAD 363YS compression/tension load cell integrated with the AN310 high-speed indicator, forming a robust force measurement system for aerospace testing.

  1. High-Frequency Data Acquisition: The AN310 indicator was configured for high-speed sampling to capture “transient thrust” during the critical ignition and shutdown phases, filtering against a high vibration environment.
  2. Bi-Directional Structural Integrity:  The 363YS’ construction allows it to handle the massive compression of engine thrust and the tension forces required for pre-test structural calibration.
  3. Loaded Temperature Performance Validation: Physically applied known deadweight loads at the rated extreme temperatures in our test lab to validate survivability and tune TC Span and TC Zero against real test data, improving data fidelity and reliability across the full operating temperature range.
ENVIAR CONSULTA

Conclusión

Rocket-Engine-Main
363YS-Grid

Palabras clave:
Static Fire Testing, Rocket Engine Thrust, Cryogenic Monitoring, Peak Force Capture.

Productos destacados

CUSTOM 363YS
Compression & Tension Load Cell
Véase la versión estándar.

  • Temperature compensation under load for superior data fidelity
  • Physically tested to survive in extreme temperature environments
  • Customized for vibration, water/steam, and flame resistance
  • Standard Rated Capacities: 1t, 2t, 3t, 5t, 10t, 20t, 30t, 50t, 100t, 150t, 200t, 300t

AN310
Force Measurement Indicator
Véase la versión estándar.

  • Internal resolution of 16 million counts ensures exceptional precision and stability in measurement
  • Ultra-high-speed 5 kHz ADC enables fast, accurate weight capture, ideal for dynamic weighing scenarios.
  • Simultaneous multi-output support allows seamless integration with multiple systems and protocols.
  • 4 digital inputs (photocoupler) and 4 digital outputs (PhotoMOS relay) provide flexible external control and system interaction.
  • 10-point calibration capability provides precise linearity across the full measuring range.
  • Password-protected calibration
  • Dual calibration modes support both real-load and digital methods for flexible installation and maintenance.
  • Stores up to 3 calibration backups with easy restore and automatic/manual save options

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