Methodology for modeling the mechanical interaction between a reaction wheel and a flexible structure

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.

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“…The micro vibration of the flywheel is caused by static unbalance and dynamic unbalance of the flywheel [20], as shown in Fig. 2.…”

Section: Modeling Of Flywheel Characteristic Of Vibrationmentioning

confidence: 99%

“…The displacement may be interpreted as the image shift probability distribution of the sample generated by vibration. The imaging MTF of vibration is calculated with the optical transfer function (OTF) formula (19) and formula of N-order statistical moments (20) [28], and the flowchart is shown in Fig. 11.…”

Section: Calculation Of Mtfmentioning

confidence: 99%

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

Changcheng

Jia

et al. 2016

Photonic Sens

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“…A force filter method was introduced to evaluate the coupled performance between cooler and camera [9]. Fig.…”

Section: Coupled Disturbance Analysis In Space Cameramentioning

confidence: 99%

“…Microvibration disturbances are typically measured in a "blocked" configuration, and load transducers are used to measure the resulting disturbance loads at the interface [9,10]. However, this method is not an accurate representation of the coupled boundary conditions that occur when the PTC is mounted to a structure.…”

Section: Introductionmentioning

confidence: 99%

Coupled disturbance analysis of a pulse tube cryocooler

Li¹,

Zhang²,

Liu³

et al. 2017

Vib. proced.

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Abstract.To predict accurate micro-vibration produced by a spaceborne payload mounted pulse tube cryocooler (PTC), a coupled disturbance analysis of cryocooler with flexible support structures have been discussed and investigated. A coupled transfer function matrix is introduced by improving the traditional disturbance analysis. According to the coupling disturbance relationship between the source and supporting structure, microvibration input load is accurately obtained. Based on the finite element model of the space camera, the performance of optical system is analyzed. Compared to the decoupled method, this coupled method can accurately predict the local transfer characteristics between cryocooler and interface.

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“…As the sources are dynamically coupled to the satellite [43,44,38], in order to determine their impact on the platform response, two aspects have to be considered:…”

Section: Dynamic Coupling For 1 Sourcementioning

confidence: 99%

A stochastic methodology for predictions of the environment created by multiple microvibration sources

Remedia

Aglietti

Richardson

2015

Journal of Sound and Vibration

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Methodology for modeling the mechanical interaction between a reaction wheel and a flexible structure

Cited by 19 publications

References 2 publications

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

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

Coupled disturbance analysis of a pulse tube cryocooler

A stochastic methodology for predictions of the environment created by multiple microvibration sources

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