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

Remedia, Marcello; Aglietti, Guglielmo S.; Richardson, Guy

doi:10.1016/j.jsv.2015.01.035

Cited by 19 publications

(6 citation statements)

References 34 publications

(37 reference statements)

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“…SSTL300-S1 platform [3,4] and Skybox [5]), all carry vibration sensitive instruments on-board (e.g. high resolution cameras aiming to achieve 1m ground resolution), thereby, even displacements in the order of micro-meters of the instrument mounting interface may signicantly aect the light of sight of the instrument, dramatically reducing its performance.…”

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confidence: 99%

Dynamic Mass of a Reaction Wheel Including Gyroscopic Effects: An Experimental Approach

2017

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In the recent years, driven by the increasingly stringent stability requirements imposed by some satellites' payloads (e.g. the new generation of optical instruments), the issue of accurate on-board spacecraft microvibration modelling has attracted signicant interest from engineers and scientists. This paper investigates the microvibrationinduced phenomenon on a cantilever congured reaction wheel assembly including sub and higher harmonic amplications due to modal resonances and broadband noise. A mathematical model of the reaction wheel assembly is developed and validated against experimental test results. The model is capable to represent each conguration in which the reaction wheel assembly will operate whether it is hard-mounted on a dynamometric platform or suspended free-free. The outcomes of this analysis are used to establish a novel methodology to retrieve the dynamic mass of the reaction wheel assembly in its operative range of speeds. An alternative measurement procedure has been developed for this purpose, showing to produce good estimates over a wide range of frequency using a less complex test campaign compared to typical dynamic mass setups. Furthermore, the gyroscopic eect inuence in the reaction wheel assembly response is thoroughly examined both analytically and experimentally. Finally, to what extent the noise aects the convergence of the novel approach is investigated.

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confidence: 99%

Dynamic Mass of a Reaction Wheel Including Gyroscopic Effects: An Experimental Approach

2017

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“…Since these methods are too computationally expensive and industrial companies usually start their analysis from a FE model, it would be useful to adopt a method able to extend the validity of FEM at high frequencies. This task can be performed using an extension of the Craig-Bampton method, as reported in [13] and [14]. This method is able to reduce the complexity of the structure in terms of degrees of freedom and to include uncertainties related to the spacecraft.…”

Section: Introductionmentioning

confidence: 99%

A Preliminary Methodology to Account for Structural Dynamics Variability of Satellites in Microvibration Analysis

Lellis

Stabile

Aglietti

et al. 2018

2018 AIAA/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference

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Due to constantly increasing requirements for more precise and high-resolution instrumentations, microvibration prediction represents an issue of growing importance. Hence the need of reliable analysis tools which can evaluate microvibrations effects efficiently. This paper describes how to tackle the issue of structural uncertainties in microvibration predictions. In particular, uncertainties related to the microvibration sources are analysed as well as those linked to the modelling of the structure. A methodology to define the worst case of vibration produced by on board sources is presented and compared to experimental data. Additionally, an approach to quantify the uncertainties in the Finite Element model is also described.

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“…The widespread practice for jitter predictions is to use FEM models [5,6] with a high number of states. Nonetheless this task results hard if a FEM model has to be provided for each predicted reaction wheel speed or a different angular configuration of a solar panel driven by a Solar Array Drive Mechanism (SADM).…”

Section: Background and Motivationmentioning

confidence: 99%

Integrated modeling of microvibrations induced by Solar Array Drive Mechanism for worst-case end-to-end analysis and robust disturbance estimation

Sanfedino

Alazard

Preda

et al. 2022

Mechanical Systems and Signal Processing

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

Cited by 19 publications

References 34 publications

Dynamic Mass of a Reaction Wheel Including Gyroscopic Effects: An Experimental Approach

Dynamic Mass of a Reaction Wheel Including Gyroscopic Effects: An Experimental Approach

A Preliminary Methodology to Account for Structural Dynamics Variability of Satellites in Microvibration Analysis

Integrated modeling of microvibrations induced by Solar Array Drive Mechanism for worst-case end-to-end analysis and robust disturbance estimation

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