Development of a Lubrication System for Momentum Wheels Used in Spacecrafts

Sathyan, K.; Gopinath, K.; Hsu, Hung-Yao; Lee, Sang‐Heon

doi:10.1007/s11249-008-9367-5

Cited by 16 publications

(7 citation statements)

References 13 publications

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“…The passive systems, also known as continuous systems, supplies lubricant continuously to the bearings and is driven by centrifugal force or by surface migration force. The centrifugal lubricators 9,10) , the oozing flow lubricators [11][12][13][14] ,wick feed systems 15) , porous lubricant reservoirs 10) etc come under this classification.…”

Section: Passive Lubrication Systemsmentioning

confidence: 99%

Development of a Positive Lubrication System for Space Application

et al. 2010

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The success of a spacecraft mission depends to a great extent on the performance of the moving mechanical systems. The most common mode of failure in these systems is tribological. Tribological failures occur mainly due to non availability of lubricant at the working zone of the bearings as a result of degradation, evaporation and creep. The life of these moving mechanical systems could be extended, if lubricant is replenished by some means. This paper describes the development of a positive lubrication system named as command lubrication system (CLS). This is an active lubrication system which when actuated by external commands delivers lubricant to the bearings. It is actuated only when there is a demand for lubricant indicated by increase in frictional torque or bearing temperature. The outstanding feature of this system is that the lubricant is stored under ambient pressure and hence less chance of leakage. The CLS can solve the lubrication problem of spacecraft systems which require very long mission life of more than 20 years. It is also suitable to tribosystems in terrestrial devices.

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Section: Passive Lubrication Systemsmentioning

confidence: 99%

Development of a Positive Lubrication System for Space Application

et al. 2010

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“…Lubrication evaporation, degradation, and migration, driven by the vacuum, thermal gradient, and centrifugal force, are the primary sources of lubrication loss in the bearing unit of an RW. The experiments in [ 19 , 20 , 21 ] also show that, among the three primary sources of lubricant loss, lubrication evaporation and creeping play the most critical roles, and they are both functions of lubricant temperature. The analysis of the main causes of lubrication loss led to the development of a nonlinear temperature function as a degradation model.…”

Section: Introductionmentioning

confidence: 99%

Fault Diagnosis of Lubrication Decay in Reaction Wheels Using Temperature Estimation and Forecasting via Enhanced Adaptive Particle Filter

Alidadi

Rahimi

2023

Sensors

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Reaction wheels (RW), the most common attitude control systems in satellites, are highly prone to failure. A satellite needs to be oriented in a particular direction to maneuver and accomplish its mission goals; losing the reaction wheel can lead to a complete or partial mission failure. Therefore, estimating the remaining useful life (RUL) over long and short spans can be extremely valuable. The short-period prediction allows the satellite’s operator to manage and prioritize mission tasks based on the RUL and increases the chances of a total mission failure becoming a partial one. Studies show that lack of proper bearing lubrication and uneven frictional torque distribution, which lead to variation in motor torque, are the leading causes of failure in RWs. Hence, this study aims to develop a three-step prognostic method for long-term RUL estimation of RWs based on the remaining lubricant for the bearing unit and a potential fault in the supplementary lubrication system. In the first step of this method, the temperature of the lubricants is estimated as the non-measurable state of the system using a proposed adjusted particle filter (APF) with angular velocity and motor current of RW as the available measurements. In the second step, the estimated lubricant’s temperature and amount of injected lubrication in the bearing, along with the lubrication degradation model, are fed to a two-step particle filter (PF) for online model parameter estimation. In the last step, the performance of the proposed prognostics method is evaluated by predicting the RW’s RUL under two fault scenarios, including excessive loss of lubrication and insufficient injection of lubrication. The results show promising performance for the proposed scheme, with accuracy in estimation of the degradation model’s parameters around 2–3% of root mean squared percentage error (RMSPE) and prediction of RUL around 0.1–4% error.

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“…The results show that the gyroscopic moment generated by the rotating wheel body in the momentum wheel significantly influences the supporting frame. To ensure that the service life of bearing assemblies meets expectations under the steady state and variable speed conditions, Sathyan et al [19] designed a micro oil storage lubrication system for bearing assemblies of momentum/reaction wheels. Sochting et al [20] studied the effect of vibrations caused by responses to external excitation on space ball bearings under solid and liquid lubrication conditions.…”

Section: Introductionmentioning

confidence: 99%

Research on the Relationship between Dynamic Characteristics and Friction Torque Fluctuation of CMGB under the Condition of Time-Varying Moment

Zhang,

Li,

Zhou

et al. 2023

Lubricants

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In this paper, a dynamic simulation analysis model was established for CMGB (control moment gyroscope bearing) under the conditions of time-varying moment. The influences of the moment’s response time, axial preload, and working temperature on the dynamic characteristics and friction torque of CMGB were analyzed, and the relevant verification tests were conducted. The results show that the friction torque fluctuation of CMGB directly corresponds to the dynamic characteristics. The faster the response time of the time-varying moment, the larger the friction torque fluctuation of CMGB. The larger preload minimizes the difference in the ball’s loading state, which is the actual reason for reducing the friction torque fluctuation. Moreover, as the working temperature increases, the friction torque fluctuation of CMGB decreases.

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Development of a Lubrication System for Momentum Wheels Used in Spacecrafts

Cited by 16 publications

References 13 publications

Development of a Positive Lubrication System for Space Application

Development of a Positive Lubrication System for Space Application

Fault Diagnosis of Lubrication Decay in Reaction Wheels Using Temperature Estimation and Forecasting via Enhanced Adaptive Particle Filter

Research on the Relationship between Dynamic Characteristics and Friction Torque Fluctuation of CMGB under the Condition of Time-Varying Moment

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