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Identification Method for Gravity Caused Effects During the Characterization of Micro-Vibration Sources

Bestard Körner, Matias (2022) Identification Method for Gravity Caused Effects During the Characterization of Micro-Vibration Sources. In: Proceedings of the International Astronautical Congress, IAC. 73rd International Astronautical Congress (IAC), 18-22 September 2022, Paris, France. ISSN 0074-1795.

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Official URL: https://dl.iafastro.directory/event/IAC-2022/paper/72668/

Abstract

Observation payloads, communication systems or micro-gravity research platforms are applications that usually need a very disturbance-free environment to accomplish their operational goals. The success of these missions can be endangered by tiny disturbances and accelerations, also called micro-vibrations, caused by equipment that rely on movable parts or onboard motors. Failing to identify the micro-vibration behavior of mechanisms can lead to degradation, or even failure, of the whole payload or other onboard systems. Therefore, the early identification of disturbance sources and understanding their behavior is critical to avoid delays and cost increases at later project stages. The characterization of micro-vibration sources is generally performed during ground tests, either with the individual equipment fixed on a dynamometer, or once already integrated on a spacecraft when few to none orientation changes are anymore allowed. As such, the effect of gravity during the characterization of components for their micro-vibration nature may change the measured output disturbance; this is the case, for example, of bearing noise or other strongly non-linear behaving elements caused by material-, geometric- or constraint caused nonlinearity. In this study we show an identification method to preliminarily estimate the impact of gravity while characterizing the micro-vibration profiles caused by spacecraft mechanisms. More specifically, the method foresees the rotation of the component with respect to the gravity vector, thus enabling the observation of gravity-caused effects for small and medium sized components. Furthermore, it allows the refinement of already developed numerical models, i.e. in Finite Element Analysis verification. As a result, characterizing gravity influence may show that requirement changes are needed, e.g. at component level, or that new containment measures at the spacecraft-system level have to be added. Lastly, the method can provide some insight into the root cause of the disturbance within its source and lead to additional studies, which can be tailored based on the component’s individual operational nature.

Item URL in elib:https://elib.dlr.de/190194/
Document Type:Conference or Workshop Item (Speech)
Title:Identification Method for Gravity Caused Effects During the Characterization of Micro-Vibration Sources
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Bestard Körner, MatiasUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Date:19 September 2022
Journal or Publication Title:Proceedings of the International Astronautical Congress, IAC
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:No
Series Name:Proceedings of the International Astronautical Congress, IAC
ISSN:0074-1795
Status:Published
Keywords:micro-vibration, jitter, reaction-wheel, characterization, micro-gravity
Event Title:73rd International Astronautical Congress (IAC)
Event Location:Paris, France
Event Type:international Conference
Event Dates:18-22 September 2022
Organizer:IAF
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:other
DLR - Research area:Raumfahrt
DLR - Program:R - no assignment
DLR - Research theme (Project):R - no assignment
Location: Bremen
Institutes and Institutions:Institute of Space Systems > Navigation and Control Systems
Deposited By: Bestard Körner, Matias
Deposited On:11 Sep 2023 09:21
Last Modified:11 Sep 2023 09:21

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