Abstract
This paper focuses on improving the performance of the rigid support cantilevered momentum wheel assemblies (CMWA) by soft suspension support. A CMWA, supported by two angular contact ball bearings, was modeled as a Jeffcott rotor. The support stiffness, before and after in series with a linear soft suspension support, were simplified as two Duffing's type springs respectively. The result shows that the rigid support CMWA produces large disturbance force at the resonance speed range. The soft suspension CMWA can effectively reduce the force on the bearing (also disturbance forces produced by the CMWA) at high rotational speed, and also reduce the nonlinear characteristic of the stiffness. However, the instability of the soft suspension CMWA will limit the maximum rotational speed of the CMWA. Thus, a "proper" stiffness of the soft suspension system is a trade-off strategy between reduction of the force and extension of the speed range simultaneously.
Highlights
The microvibrations produced by reaction/momentum wheel assemblies (R/Momentum Wheel Assemblies (MWA)) onboard spacecraft, for example reaction/momentum wheel assemblies (R/MWA), cryo-coolers, thrusters, solar array drive mechanisms, and mobile mirrors, can degrade the performance of instruments with high pointing precision and stability [1,2,3,4]
Elias and Miller have proposed a coupled Reaction Wheel Assemblies (RWA) disturbance analysis method using dynamic mass measurement techniques [9], and Shigemune et al have established a method to measure low frequency disturbances induced by R/MWA [10], which are traditionally difficult to detect, and revealed that the internal dynamics of the R/MWA closely relate to the disturbances
We investigated the stiffness of the angular contact ball bearing and its nonlinearity, and analyzed the performance of the cantilevered momentum wheel assemblies (CMWA) with a soft suspension support in series
Summary
The microvibrations produced by reaction/momentum wheel assemblies (R/MWA) onboard spacecraft, for example reaction/momentum wheel assemblies (R/MWA), cryo-coolers, thrusters, solar array drive mechanisms, and mobile mirrors, can degrade the performance of instruments with high pointing precision and stability [1,2,3,4] These disturbances are attracting more and more attentions, because they are significant in the 1k Hz frequency range [5] and excite flexible modes of the spacecraft, which cannot be controlled or reduced by the attitude and orbit control systems. We investigated the stiffness of the angular contact ball bearing and its nonlinearity, and analyzed the performance of the CMWA with a soft suspension support in series.
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