Vibration Isolation of Precision Payloads: A Six-Axis Electromagnetic Relaxation Isolator

Abstract

This paper describes a passive 6-axis vibration isolation system for space applications. The system consists of a Stewart platform with cubic architecture; each leg is equipped with an electromagnetic transducer connected to a RL circuit. The system behaves like a relaxation isolator and its transmissibility exhibits an asymptotic decay rate of −40 dB/decade. The performances are very similar to that of an active isolator based on a sky-hook controller.

Modeling and analysis of a flywheel microvibration isolation system for spacecrafts

“…This objective is required to ensure the attitude control system will not be affected (Marneffe et al, 2009). The second objective is to minimize the chasm between the sixth and the first modal frequencies.…”

Development of Integrated Simulation Tool for Jitter Analysis

“…By tuning the value of parameters k 1 , k 2 , and c, high damping at resonance can be achieved without sacrificing the high frequency isolation performance and this is a drawback with the conventional two parameter passive isolator. Maximum damping for the given values of k 1 and k 2 is achieved by using equation 11 where, ω n =(k 1 /m 1 ) and Ω n =((k 1 +k 2 )/m 1 [22]. Piezoelectric stack actuator, represented by its stiffness (k a ) and extension (δ), is connected in parallel in order to enhance the performance of the vibration isolator.…”

Design and experiments of an active isolator for satellite micro-vibration

“…Ref. [11] proposed a simple isolator, which consisted of a spring in parallel with an electromagnetic Maxwell unit. Passive isolation is necessary to limit the amplification at resonance but tends to reduce high-frequency attenuation.…”