Abstract
In recent years, remarkable advances in computing performance and computer-aided engineering have enabled reliability-based design optimization (RBDO) to guarantee the target reliability of a product. For successful product development through RBDO, it is indispensable to clarify uncertainties of unknown model variables. In most cases, however, due to cost and time constraints, there are not enough test data, which can lead to a less reliable optimum. For this reason, the primary purpose of this study is to propose a pragmatic approach to perform an inverse uncertainty quantification or a statistical model calibration more accurately and efficiently under an insufficient data environment. Based on the Bayesian model calibration framework, the proposed method consists of two main steps: (1) prior distribution prediction using output (i.e., component) test data and (2) posterior distribution prediction using input (i.e., coupon) test data. In the prior distribution prediction step, the maximum likelihood estimate (MLE) is used to obtain the estimated statistical parameters, the distribution type of unknown model variables, and the Fisher information matrix (FIM) to calculate variances of the estimated statistical parameters. The posterior distribution prediction step utilizes the Bayes’ theorem, which combines the prior distribution with the likelihood obtained by reflecting the input test data into the probability density of the estimated unknown model variable. During this process, each test data that is insufficient to directly model or indirectly predict the probability density of the unknown model variable can be integrated to address the crucial issue of the insufficient data effectively. Mathematical and engineering examples are utilized to validate the proposed method for quantification of unknown model variables.
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Abbreviations
- \({\mathbf{d}}\) :
-
A controllable design variable vector
- \(z^{{\text{s}}} \left( \cdot \right)\) :
-
Response function of a simulation model
- \({{\varvec{\upxi}}}\) :
-
A known model variable vector
- \(\varphi \left( \cdot \right)\) :
-
Function as a calibration metric
- \({{\varvec{\uptheta}}}\) :
-
An unknown model variable vector
- \(L\left( \cdot \right)\) :
-
Likelihood function
- \({{\varvec{\Theta}}}\) :
-
A vector of the statistical parameters of the unknown model variables
- \(l\left( \cdot \right)\) :
-
Log-likelihood function
- \(\zeta\) :
-
Distribution type of the unknown model variable
- \(p\left( \cdot \right)\) :
-
Posterior PDF
- \(\delta \left( \cdot \right)\) :
-
A discrepancy function between the experimental and the simulation model
- \(\pi \left( \cdot \right)\) :
-
Prior PDF
- \(\varepsilon\) :
-
A measurement error
- \(\hat{F}_{{x_{i} }} \left( \cdot \right)\) :
-
CDF of an unknown model variable at calibration site \(x_{i}\)
- \({\mathbf{y}}^{{\text{e}}}\) :
-
An output test data vector
- \(U_{{a,m_{v} }}^{{\text{m}}} \left( \cdot \right)\) :
-
PDF of area-metric calculated by taking \(m_{v}\) observations from the estimated probability model
- \({\mathbf{x}}^{{\text{e}}}\) :
-
An input test data vector
- \(T_{{n_{v} }} \left( \alpha \right)\) :
-
Threshold of \(\alpha\) significance level for \(n_{v}\) validation samples
- \(y_{i}^{{\text{e}}} {, }y_{j}^{{\text{e}}}\) :
-
Output test data for calibration and validation, respectively
- \(n_{c} {, }n_{v}\) :
-
The quantity of output observations for calibration and validation, respectively
- \(x_{i}^{{\text{e}}} {, }x_{j}^{{\text{e}}}\) :
-
Input test data for calibration and validation, respectively
- \(m_{c} {, }m_{v}\) :
-
The quantity of input observations for calibration and validation, respectively
- \({\overline{\mathbf{I}}}\) :
-
Expected Fisher information matrix in entire observations
- \(k\) :
-
Number of unknown model variables
- \({\mathbf{I}}\) :
-
Observed Fisher information matrix in entire observations
- \(u_{j}\) :
-
The u-value; CDF value at validation site \(x_{j}\)
- \({\mathbf{I}}_{1}\) :
-
The Fisher information matrix in a single observation
- \(u_{{a,m_{v} }}^{{{(}j{)}}}\) :
-
\(j\)-th area-metric calculated by taking \(m_{v}\) observations from the estimated probability model
- \(a{, }b\) :
-
The model parameters of the given parametric PDF
- \(u_{{a,m_{v} }}^{{\text{m}}}\) :
-
Area-metric value calculated by taking \(m_{v}\) observations from the estimation
- \(z^{{\text{e}}} \left( \cdot \right)\) :
-
Response function of experiment
- \(u_{{a,m_{v} }}^{{\text{e}}}\) :
-
Area-metric value calculated by taking \(m_{v}\) observations from experiment
- \(F_{X} {, }F_{Y}\) :
-
Horizontal and vertical loads acting on a cantilever beam, respectively
- \(\lambda_{1} {,}\lambda_{2} {,}\lambda_{3}\) :
-
Principal stretches
- \(w{, }t\) :
-
Width and thickness of the cantilever beam, respectively
- \(I_{1} {,}I_{2} {,}I_{3}\) :
-
Strain invariants
- \(D\) :
-
The deflections of the cantilever beam
- \(s\) :
-
Strain energy
- \(E\) :
-
The elastic modulus of the cantilever beam
- \(W\left( \cdot \right)\) :
-
Function of strain energy potential
- \(L\) :
-
The length of the cantilever beam
- \(C_{10} {, }B_{1}\) :
-
The material parameters of the Neo-Hookean function
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Choo, J., Jung, Y. & Lee, I. A bayesian model calibration under insufficient data environment. Struct Multidisc Optim 65, 96 (2022). https://doi.org/10.1007/s00158-022-03196-y
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DOI: https://doi.org/10.1007/s00158-022-03196-y