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Title: Interface reduction for Hurty/Craig-Bampton substructured models: Review and improvements

Abstract

The Hurty/Craig-Bampton method in structural dynamics represents the interior dynamics of each subcomponent in a substructured system with a truncated set of normal modes and retains all of the physical degrees of freedom at the substructure interfaces. This makes the assembly of substructures into a reduced-order system model relatively simple, but means that the reduced-order assembly will have as many interface degrees of freedom as the full model. When the full-model mesh is highly refined, and/or when the system is divided into many subcomponents, this can lead to an unacceptably large system of equations of motion. To overcome this, interface reduction methods aim to reduce the size of the Hurty/Craig-Bampton model by reducing the number of interface degrees of freedom. This research presents a survey of interface reduction methods for Hurty/Craig-Bampton models, and proposes improvements and generalizations to some of the methods. Some of these interface reductions operate on the assembled system-level matrices while others perform reduction locally by considering the uncoupled substructures. The advantages and disadvantages of these methods are highlighted and assessed through comparisons of results obtained from a variety of representative linear FE models.

Authors:
 [1];  [2];  [3];  [3];  [4];  [5];  [6];  [7]
  1. Univ. of Colorado, Boulder, CO (United States). Dept. of Aerospace Engineering Sciences
  2. Delft Univ. of Technology (Netherlands). Dept. of Maritime and Materials Engineering
  3. Univ. of Stuttgart, Stuttgart (Germany)
  4. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
  5. Univ. of Wisconsin, Madison, WI (United States). Dept. of Engineering Physics
  6. Federal Inst. of Technology, Zurich (Switzerland). Inst. for Mechanical Systems
  7. Rice Univ., Houston, TX (United States). Dept. of Mechanical Engineering
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1478217
Alternate Identifier(s):
OSTI ID: 1582728
Report Number(s):
SAND-2017-3191J
Journal ID: ISSN 0888-3270; PII: S088832701830284X
Grant/Contract Number:  
AC04-94AL85000; NA-0003525
Resource Type:
Accepted Manuscript
Journal Name:
Mechanical Systems and Signal Processing
Additional Journal Information:
Journal Volume: 114; Journal Issue: C; Journal ID: ISSN 0888-3270
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; Component mode synthesis; Substructuring; Hurty/Craig-Bampton method; Interface reduction; Characteristic constraint modes

Citation Formats

Krattiger, Dimitri, Wu, Long, Zacharczuk, Martin, Buck, Martin, Kuether, Robert J., Allen, Matthew S., Tiso, Paolo, and Brake, Matthew R. W. Interface reduction for Hurty/Craig-Bampton substructured models: Review and improvements. United States: N. p., 2018. Web. doi:10.1016/j.ymssp.2018.05.031.
Krattiger, Dimitri, Wu, Long, Zacharczuk, Martin, Buck, Martin, Kuether, Robert J., Allen, Matthew S., Tiso, Paolo, & Brake, Matthew R. W. Interface reduction for Hurty/Craig-Bampton substructured models: Review and improvements. United States. doi:10.1016/j.ymssp.2018.05.031.
Krattiger, Dimitri, Wu, Long, Zacharczuk, Martin, Buck, Martin, Kuether, Robert J., Allen, Matthew S., Tiso, Paolo, and Brake, Matthew R. W. Fri . "Interface reduction for Hurty/Craig-Bampton substructured models: Review and improvements". United States. doi:10.1016/j.ymssp.2018.05.031. https://www.osti.gov/servlets/purl/1478217.
@article{osti_1478217,
title = {Interface reduction for Hurty/Craig-Bampton substructured models: Review and improvements},
author = {Krattiger, Dimitri and Wu, Long and Zacharczuk, Martin and Buck, Martin and Kuether, Robert J. and Allen, Matthew S. and Tiso, Paolo and Brake, Matthew R. W.},
abstractNote = {The Hurty/Craig-Bampton method in structural dynamics represents the interior dynamics of each subcomponent in a substructured system with a truncated set of normal modes and retains all of the physical degrees of freedom at the substructure interfaces. This makes the assembly of substructures into a reduced-order system model relatively simple, but means that the reduced-order assembly will have as many interface degrees of freedom as the full model. When the full-model mesh is highly refined, and/or when the system is divided into many subcomponents, this can lead to an unacceptably large system of equations of motion. To overcome this, interface reduction methods aim to reduce the size of the Hurty/Craig-Bampton model by reducing the number of interface degrees of freedom. This research presents a survey of interface reduction methods for Hurty/Craig-Bampton models, and proposes improvements and generalizations to some of the methods. Some of these interface reductions operate on the assembled system-level matrices while others perform reduction locally by considering the uncoupled substructures. The advantages and disadvantages of these methods are highlighted and assessed through comparisons of results obtained from a variety of representative linear FE models.},
doi = {10.1016/j.ymssp.2018.05.031},
journal = {Mechanical Systems and Signal Processing},
number = C,
volume = 114,
place = {United States},
year = {2018},
month = {5}
}

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