Flywheel micro-vibration characters of a high resolution optical satellite

Abstract

According to the pictures of a sub-meter resolution optical satellite which were acquired on orbit, there is a phenomenon of jitter in the process of taking pictures. As the main attitude control component of the satellite, the flywheel will produce the disturbance in its normal work, which has great influence on the high resolution optical satellite. This paper has respectively researched the flywheel components' disturbance mechanism from four parts, including uneven rotator, rotator friction, bearing disturbance, foundation loose, and builds the mathematical model of disturbance to analyze the characteristics of disturbance. We have simulated and tested the flywheel components' disturbance. The disturbance force of flywheel components is 2 N magnitude and the torque of disturbance is 1.5 N•m magnitude in time domain. The flywheel's infrastructure should be more inflexible especially around 90-100 Hz. For this target high resolution optical satellite, there should be effective damping measures around 48.6 Hz, 190.4 Hz and 285.4 Hz to decrease the flywheel disturbance to guarantee the high precision of the satellite. The result would offer guidance for system optimization design and vibration isolation compensation of the later type of improved satellite or other same type of satellites.

Progress of Stewart Vibration Platform in Aerospace Micro–Vibration Control

“…10 g − a is mainly caused by the high-frequency operation of space-borne equipment such as s sors and momentum wheels [40][41][42].…”

“…The vibration of low-frequency micro-vibration is random and complex, and the vibration acceleration is 10 −5 g 0 ~10 −2 g 0 . The frequency of medium-and high-frequency micro-vibration is high, the amplitude is small, and the acceleration is greater than 10 −2 g 0 and is mainly caused by the high-frequency operation of space-borne equipment such as sensors and momentum wheels [40][41][42].…”

Laser welding of austenitic ferrofluid container for the KRAKsat satellite

“…Currently used reaction wheels for the rotation of space vehicles according to their axis have a mechanical effect, which causes many inconveniences. Mechanical reaction wheels are heavy and complex, require additional bearings and lubrication, are unreliable, and wear out quickly [2][3][4]. A new solution that eliminates the disadvantages of traditional reaction wheels is a liquid reaction wheel that does not have a single movable part that can catch or jam.…”