Research Papers: Design Automation

Validating Dynamic Engineering Models Under Uncertainty

[+] Author and Article Information
Zequn Wang

Department of Mechanical Engineering,
Northwestern University,
Evanston, IL 60208
e-mail: zequn.wang@northwestern.edu

Yan Fu

Research and Advanced Engineering,
Ford Motor Company,
Dearborn, MI 48121
e-mail: yfu4@ford.com

Ren-Jye Yang

Research and Advanced Engineering,
Ford Motor Company,
Dearborn, MI 48121
e-mail: ryang@ford.com

Saeed Barbat

Research and Advanced Engineering,
Ford Motor Company,
Dearborn, MI 48121
e-mail: sbarbat@ford.com

Wei Chen

Department of Mechanical Engineering,
Northwestern University,
Evanston, IL 60208
e-mail: weichen@northwestern.edu

1Corresponding author.

Contributed by the Design Automation Committee of ASME for publication in the JOURNAL OF MECHANICAL DESIGN. Manuscript received February 16, 2016; final manuscript received May 30, 2016; published online September 12, 2016. Assoc. Editor: Zissimos P. Mourelatos.

J. Mech. Des 138(11), 111402 (Sep 12, 2016) (12 pages) Paper No: MD-16-1128; doi: 10.1115/1.4034089 History: Received February 16, 2016; Revised May 30, 2016

Validating dynamic engineering models is critically important in practical applications by assessing the agreement between simulation results and experimental observations. Though significant progresses have been made, the existing metrics lack the capability of managing uncertainty in both simulations and experiments. In addition, it is challenging to validate a dynamic model aggregately over both the time domain and a model input space with data at multiple validation sites. To overcome these difficulties, this paper presents an area-based metric to systemically handle uncertainty and validate computational models for dynamic systems over an input space by simultaneously integrating the information from multiple validation sites. To manage the complexity associated with a high-dimensional data space, eigenanalysis is performed for the time series data from simulations at each validation site to extract the important features. A truncated Karhunen–Loève (KL) expansion is then constructed to represent the responses of dynamic systems, resulting in a set of uncorrelated random coefficients with unit variance. With the development of a hierarchical data-fusion strategy, probability integral transform (PIT) is then employed to pool all the resulting random coefficients from multiple validation sites across the input space into a single aggregated metric. The dynamic model is thus validated by calculating the cumulative area difference of the cumulative density functions. The proposed model validation metric for dynamic systems is illustrated with a mathematical example, a supported beam problem with stochastic loads, and real data from the vehicle occupant-restraint system.

Copyright © 2016 by ASME
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Fig. 1

Model validation of dynamic systems

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Fig. 2

Variation-Based KL transformation

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Fig. 3

Reconstructions of a random process using the truncated KL expansion

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Fig. 4

Hierarchical data structure

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Fig. 5

PIT for the ith coefficient

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Fig. 6

Area-based validation metric

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Fig. 7

Mean function of the random responses

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Fig. 8

Principal eigenvalues in spectral decomposition

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Fig. 9

Empirical probability density function of the coefficients and area-based dynamic model validation metric

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Fig. 10

Area-based model validation metric

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Fig. 11

Observations and results for the first case

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Fig. 12

Validation metric for cases 2–4

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Fig. 13

Geometry of the supported beam

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Fig. 14

Finite-element analysis of the supported beam

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Fig. 15

Experimental observations of the supported beam

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Fig. 16

Coefficients C1 and C2 for the first validation site

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Fig. 17

Area-based validation metric

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Fig. 18

Chest acceleration in the X-direction: models versus tests

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Fig. 19

Ten significant eigenvalues

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Fig. 20

Area-based validation metric




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