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Development of Multi-Physics Dynamics Models for High-Frequency Large-Amplitude Structural Response SimulationAn analytic approach is demonstrated to reveal potential pyroshock-driven dynamic effects causing power losses in the Thermo-Electric (TE) module bars of the Mars Science Laboratory (MSL) Multi-Mission Radioisotope Thermoelectric Generator (MMRTG). This study utilizes high-fidelity finite element analysis with SIERRA/PRESTO codes to estimate wave propagation effects due to large-amplitude suddenly-applied pyro shock loads in the MMRTG. A high fidelity model of the TE module bar was created with approximately 30 million degrees-of-freedom (DOF). First, a quasi-static preload was applied on top of the TE module bar, then transient tri-axial acceleration inputs were simultaneously applied on the preloaded module. The applied input acceleration signals were measured during MMRTG shock qualification tests performed at the Jet Propulsion Laboratory. An explicit finite element solver in the SIERRA/PRESTO computational environment, along with a 3000 processor parallel super -computing framework at NASA AMES, was used for the simulation. The simulation results were investigated both qualitatively and quantitatively. The predicted shock wave propagation results provide detailed structural responses throughout the TE module bar, and key insights into the dynamic response (i.e., loads, displacements, accelerations) of critical internal spring/piston compression systems, TE materials, and internal component interfaces in the MMRTG TE module bar. They also provide confidence on the viability of this high-fidelity modeling scheme to accurately predict shock wave propagation patterns within complex structures. This analytic approach is envisioned for modeling shock sensitive hardware susceptible to intense shock environments positioned near shock separation devices in modern space vehicles and systems.
Document ID
20170007072
Document Type
Conference Paper
External Source(s)
Authors
Derkevorkian, Armen (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Peterson, Lee (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Kolaini, Ali R. (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Hendricks, Terry J. (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Nesmith, Bill J. (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Date Acquired
August 1, 2017
Publication Date
January 25, 2016
Subject Category
Mechanical Engineering
Lunar and Planetary Science and Exploration
Computer Operations and Hardware
Meeting Information
IMAC (International Modal Analysis Conference): A Conference and Exposition on Structural Dynamics: Dynamics of Multiphysical Systems: From Active Materials to Vibroacoustics(Orlando, FL)
Distribution Limits
Public
Copyright
Other
Keywords
Shock Waves
Parallel Computing
Computational Modeling
Nonlinear Dynamics

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