Abstract
Momentum wheels are the key components of the inertial actuators in the satellites, and the momentum wheel bearings are weak links of momentum wheels as they operate under harsh conditions. The reliability estimation for momentum wheel bearings are helpful to guarantee the mission successes for both momentum wheels and satellites. Hence, this paper put emphasis into reliability estimation of a momentum wheel bearing considering multiple coupling operating conditions and frictional heat by using the finite element analysis. The stress-strength interference model is employed to calculate the reliability of the momentum wheel bearing. A comparative analysis for reliability estimation with and without frictional heat of the momentum wheel bearing is conducted. The results show that the frictional heat cannot be ignored in the reliability analysis of momentum wheel bearings
Highlights
Momentum wheels (MWs) are used for changing orientation of satellites
The results indicate that frictional heat does affect the reliability of momentum wheel bearings (MWBs), and frictional heat cannot be ignored in the reliability estimation of the MWB
A reliability estimation method for MWBs based on finite element analysis (FEA) and stress-strength interference (SSI) model is proposed
Summary
Momentum wheels (MWs) are used for changing orientation of satellites. With advantages of low-power consumption, strong antidisturbance ability, contamination-free and high-control precision, MWs have been widely adopted in attitude and orbit control system of satellites. The software namely SOLIDWORKS is used to build the three Meshing is related to both accuracy of analysis results and calculadimensional model of the MWB, and ANSYS WORKBENCH is em- tion time. This paper takes these both parameters into consideration. The maximum stress points of the inner ring, outer ring and cage of the appeared at the position of contact with the rolling elements. The second maximum stress part of the MWB is the inner ring, amounting to 305.98MPa. The third maximum part is (a) The whole bearing (b) The inner ring (c) The cage (d) The outer ring (e) The rolling elements Fig. 3.
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