The University of Southampton
University of Southampton Institutional Repository

The effects of random vibration on the dimensional stability of space-based precision structures

The effects of random vibration on the dimensional stability of space-based precision structures
The effects of random vibration on the dimensional stability of space-based precision structures
Low-cost Earth-imaging instruments typically require high performance structures to ensure that critical alignments of optical components are maintained between the assembly phase, and the on-orbit operational phase. There are a number of threats to structural dimensional stability, including thermal cycling, moisture desorption and launch vibrations. This last area is the subject of this thesis. The main aim of the research described here is to better understand the effects of random vibration on the dimensional stability of precision structures. The first part of this research considered the degree to which random vibration is a problem - this was assessed by comparing its effects on dimensional stability with those of other typical environmental stressors. This was accomplished by performing a series of environmental tests on an optical breadboard structure, and measuring the dimensional stability throughout. These tests showed that random vibration could indeed pose a significant threat. The second part of the research aimed to better understand the dimensional stability response of specific structural elements - namely materials and bolted joints - to random vibration. This required the development of novel test setups and metrology techniques. Controlled tests were performed in both these structural areas, and a number of useful conclusions were drawn. The final part of the research was to investigate the empirical results using FEA methods. A significant challenge was to develop a modelling technique that is capable of predicting dimensional stability responses to random vibration. In the case of the material tests, the response of the test samples was correctly predicted using FEA with cyclic plasticity properties and parameters identified from static tests. This research has produced a number of relevant findings for spacebased stable optical bench structures. These have been condensed into a series of recommendations for design, analysis, testing, metrology and bedding-in vibration for future optical payload projects.
Edeson, Ruben
1139150c-b907-4687-89e0-d0914f2b19f3
Edeson, Ruben
1139150c-b907-4687-89e0-d0914f2b19f3
Aglietti, Guglielmo
e44d0dd4-0f71-4399-93d2-b802365cfb9e
Tatnall, Adrian
2c9224b6-4faa-4bfd-9026-84e37fa6bdf3

Edeson, Ruben (2012) The effects of random vibration on the dimensional stability of space-based precision structures. University of Southampton, Faculty of Engineering and the Environment, Doctoral Thesis, 217pp.

Record type: Thesis (Doctoral)

Abstract

Low-cost Earth-imaging instruments typically require high performance structures to ensure that critical alignments of optical components are maintained between the assembly phase, and the on-orbit operational phase. There are a number of threats to structural dimensional stability, including thermal cycling, moisture desorption and launch vibrations. This last area is the subject of this thesis. The main aim of the research described here is to better understand the effects of random vibration on the dimensional stability of precision structures. The first part of this research considered the degree to which random vibration is a problem - this was assessed by comparing its effects on dimensional stability with those of other typical environmental stressors. This was accomplished by performing a series of environmental tests on an optical breadboard structure, and measuring the dimensional stability throughout. These tests showed that random vibration could indeed pose a significant threat. The second part of the research aimed to better understand the dimensional stability response of specific structural elements - namely materials and bolted joints - to random vibration. This required the development of novel test setups and metrology techniques. Controlled tests were performed in both these structural areas, and a number of useful conclusions were drawn. The final part of the research was to investigate the empirical results using FEA methods. A significant challenge was to develop a modelling technique that is capable of predicting dimensional stability responses to random vibration. In the case of the material tests, the response of the test samples was correctly predicted using FEA with cyclic plasticity properties and parameters identified from static tests. This research has produced a number of relevant findings for spacebased stable optical bench structures. These have been condensed into a series of recommendations for design, analysis, testing, metrology and bedding-in vibration for future optical payload projects.

PDF
__soton.ac.uk_ude_PersonalFiles_Users_slb1_mydocuments_Thesis_2.0.pdf - Other
Download (3MB)

More information

Published date: 1 July 2012
Organisations: University of Southampton, Aeronautics, Astronautics & Comp. Eng

Identifiers

Local EPrints ID: 351350
URI: https://eprints.soton.ac.uk/id/eprint/351350
PURE UUID: 74732c65-f907-43f1-b880-c19781711e0e

Catalogue record

Date deposited: 02 Jul 2013 10:45
Last modified: 18 Jul 2017 04:26

Export record

Contributors

Author: Ruben Edeson
Thesis advisor: Guglielmo Aglietti
Thesis advisor: Adrian Tatnall

University divisions

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of https://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×