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Research Papers

Finite Element Model Tuning Using Measured Mass Properties and Ground Vibration Test Data

[+] Author and Article Information
Chan-gi Pak

Leader of the Structural Dynamics Group (Aero Structures Branch) NASA Dryden Flight Research Center, Edwards, CA 93523-0273

J. Vib. Acoust 131(1), 011009 (Jan 06, 2009) (9 pages) doi:10.1115/1.2981092 History: Received October 09, 2007; Revised May 13, 2008; Published January 06, 2009

A simple and efficient approach for tuning finite element models to match computed frequencies, mode shapes, and mass properties to the experimental data is introduced in this study. The model tuning procedure proposed in this study is based on a series of optimizations. This approach has been successfully applied to create an equivalent beam finite element model for the X-37 drogue chute test fixture with the X-planes pylon. The goal was a simple model capable of being analyzed in a captive carry configuration with the B-52H mother ship. This study has shown that natural frequencies, corresponding mode shapes, and mass properties from the updated finite element model achieved at the final optimization iteration have excellent agreement with corresponding measured data.

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Copyright © 2009 by American Society of Mechanical Engineers
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Figures

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Figure 8

Pretest structural dynamic finite element model for the X-37 DCTF captive carry with B-52H

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Figure 9

Mode shapes for the X-planes pylon with the X-37 DCTF: (1a) Mode 1 (pendulum mode) from the GVT, (1b) Mode 2 (yawing) from the GVT, (1c) Mode 3 (pitching) from the GVT, (2a) Mode 1 from the equivalent beam, (2b) Mode 2 from the equivalent beam, and (2c) Mode 3 from the equivalent beam

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Figure 7

A flow diagram for creating a validated structural dynamic model for B-52H/X-planes pylon/X-37 DCTF/sway braces configuration

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Figure 6

Two step model tuning procedure: Blocks (a), (b), (c), and (d) belong to the first procedure; blocks (d), (e), (f), and (g) belong to the second procedure

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Figure 5

Detailed finite element model and equivalent beam model for the X-planes pylon/X-37 DCTF/sway braces: (a) detailed finite element model, (b) equivalent beam model, (1) forward connection between the X-planes pylon and B-52H, (2) aft connection between the X-planes pylon and B-52H, (3) forward connection between the X-planes pylon and the X-37 DCTF, (4) aft connection between the X-planes pylon and the X-37 DCTF, (5) right connection between the sway brace and the X-37 DCTF, and (6) left connection between the sway brace and the X-37 DCTF

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Figure 4

Ground vibration test for the X-planes pylon/X-37 DCTF/sway braces

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Figure 3

A flow diagram of the second option for the optimization step 3

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Figure 2

A flow diagram for the optimization step 1

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Figure 1

Three optimization steps

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