Effects of rubber shock absorber on the flywheel micro vibration in the satellite imaging system

Abstract

When a satellite is in orbit, its flywheel will generate micro vibration and affect the imaging quality of the camera. In order to reduce this effect, a rubber shock absorber is used, and a numerical model and an experimental setup are developed to investigate its effect on the micro vibration in the study. An integrated model is developed for the system, and a ray tracing method is used in the modeling. The spot coordinates and displacements of the image plane are obtained, and the modulate transfer function (MTF) of the system is calculated. A satellite including a rubber shock absorber is designed, and the experiments are carried out. Both simulation and experiments results show that the MTF increases almost 10 %, suggesting the rubber shock absorber is useful to decrease the flywheel vibration.

Development of a magnetorheological isolator with variable damping and variable stiffness for broadband vibration suppression

“…The passive isolation techniques are commonly used due to the high reliability and the low cost. The passive micro-vibration isolation platforms with rubber absorber [3,4], friction dampers [5] and isolation cone system [6] have been used to suppress the vibrations. The passive damping force that cannot be controlled limits the adaptability of isolation systems.…”

An HDR imaging method with DTDI technology for push-broom cameras

“…By improving the voltage swing at the pixel output and developing new readout architecture, the DR of the CMOS image sensor is optimized [4]. For time-delay-integration (TDI) charge coupled device (CCD) image sensor which can be used in space cameras [5], an extended dynamic range architecture was designed by P. A. Levine et al [6]. As for the third kind of solution, they are all based on multi-exposure.…”