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Title: Technology/Space/Satellites - HESSI Modal Survey FEM Verification Modal survey of the HESSI spacecraft. Objective was to identify the natural frequencies, the damping factors and the mode shapes.
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HESSI  FEM Verification Navcon Engineering  Network   701 W. Las Palmas Dr. Fullerton, CA 92835 U.S.A Phone 714.441.3488 E-mail: webinfo@navcon.com Noise & Vibration Consultants HomeUp  

HESSI Modal Survey FEM Verification

Navcon Engineering was contracted to conduct the modal survey of the High Energy Solar Spectroscopic Imager (HESSI) spacecraft. The primary objective was to identify the damped natural frequencies, damping factors and mode shapes in the frequency band between 70 Hz. and 170 Hz. The test results were used to dynamicaly tune the finite element model.  In addition to the modal survey, Navcon conducted linearity and transmissibility tests.     High Energy Solar Spectroscopic Imager (HESSI) spacecraft.  HESSI's primary mission is to explore the basic physics of particle acceleration and explosive energy release in solar flares. <b>Modal</b> Test Item The test item, referred to as the HESSI Bare Structure, consisted of a base ring, primary support struts, secondary support struts, central cylinder, deck, imager support ring, solar array support struts and a solar array support ring. The modal survey was conducted using a SIMO testing method.  The data acquisition system included an HP35670A Dynamic Signal Analyzer, an HP3566A Dynamic Signal Analyzer, an APS Dynamics Model 113 long stroke electro-dynamic exciter and PCB instrumentation. Sample mode shapes are shown below.   3 D <b>Modal</b> Structure Top & ISO View Mode Shape - View Front / Side    Send mail to webinfo@navcon.com questions or comments.. Copyright © 1997 - 2007 Navcon Engineering Network Last modified: December 20, 2006
 

Modal

survey

of

the

HESSI

spacecraft.

Objective

was

to

identify

the

natural

frequencies,

the

damping

factors

and

the

mode

shapes.

http://www.navcon.com/CaseStudy_7.htm

HESSI Modal Survey FEM Verification 2008 November

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Modal survey of the HESSI spacecraft. Objective was to identify the natural frequencies, the damping factors and the mode shapes.

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