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Microgravity disturbance analysis on Chinese space laboratory.

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Accurate microgravity measurements were achieved on China’s Tianzhou-1 cargo ship and Tiangong-2 space laboratory using advanced accelerometer systems. These findings provide critical data for optimizing space-based scientific experiments.

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Area of Science:

  • Space Science
  • Astrophysics
  • Engineering

Background:

  • Understanding the microgravity environment is crucial for space-based scientific experiments.
  • China's Tianzhou-1 (TZ-1) cargo ship and Tiangong-2 (TG-2) space laboratory provide platforms for in-space research.

Purpose of the Study:

  • To validate novel technologies for microgravity measurement.
  • To record detailed microgravity acceleration data in the TZ-1 and TG-2 spacecraft.
  • To assess microgravity levels during different operational modes.

Main Methods:

  • Utilized a high-precision electrostatic suspension accelerometer system (ES-ACC) for reduced-disturbance measurements.
  • Employed a microgravity-active vibration system (MAIS) with flexible quartz accelerometers (Q-ACC).
  • Analyzed acceleration data using time-frequency-amplitude spectrograms to identify disturbances.

Main Results:

  • Observed periodical disturbances linked to orbital periods and irregular signals from in-orbit events.
  • Achieved microgravity levels better than 10-6 m/s2 (RMS) in the 0.01-10 Hz frequency range after disturbance reduction.
  • Successfully measured and characterized microgravity acceleration on TZ-1 and TG-2.

Conclusions:

  • The deployed accelerometer systems effectively measured microgravity acceleration.
  • Accurate microgravity data were obtained, enabling optimization of space laboratory conditions.
  • These measurements are vital for enhancing the success of future space experiments.