A Formulation of Structural Design Optimization Problems for Quantum Annealing
<p>A generic elastic body <math display="inline"><semantics> <mo>Ω</mo> </semantics></math> under external loading with prescribed surface traction <math display="inline"><semantics> <msub> <mover accent="true"> <mi>t</mi> <mo>^</mo> </mover> <mi>i</mi> </msub> </semantics></math> and displacement <math display="inline"><semantics> <msub> <mover accent="true"> <mi>u</mi> <mo>^</mo> </mover> <mi>i</mi> </msub> </semantics></math> on the boundary portions <math display="inline"><semantics> <msup> <mo>Γ</mo> <mi>σ</mi> </msup> </semantics></math> and <math display="inline"><semantics> <msup> <mo>Γ</mo> <mi>u</mi> </msup> </semantics></math>, respectively, and body force density <math display="inline"><semantics> <msub> <mi>f</mi> <mi>i</mi> </msub> </semantics></math>.</p> "> Figure 2
<p>Generic setup for a rod under self-weight loading that is composed of multiple elements <span class="html-italic">e</span>.</p> "> Figure 3
<p>Element-wise interpolation functions <math display="inline"><semantics> <mrow> <msubsup> <mi>ϕ</mi> <mi>e</mi> <mrow> <mi mathvariant="normal">I</mi> <mo>/</mo> <mi>II</mi> </mrow> </msubsup> <mrow> <mo>(</mo> <mi>x</mi> <mo>)</mo> </mrow> </mrow> </semantics></math> and related coefficients <math display="inline"><semantics> <msubsup> <mi>a</mi> <mi>e</mi> <mrow> <mi mathvariant="normal">I</mi> <mo>/</mo> <mi>II</mi> </mrow> </msubsup> </semantics></math> for the approximation of the force functions <math display="inline"><semantics> <mrow> <msub> <mi>F</mi> <mi>e</mi> </msub> <mrow> <mo>(</mo> <mi>x</mi> <mo>)</mo> </mrow> </mrow> </semantics></math>.</p> "> Figure 4
<p>Structural analysis problem: Setup and QUBO pattern. (<b>a</b>) Setup for the composed rod with identical cross sections; (<b>b</b>) pattern of the interactions between the input qubits <math display="inline"><semantics> <msub> <mi>q</mi> <mi>i</mi> </msub> </semantics></math> and <math display="inline"><semantics> <msub> <mi>q</mi> <mi>j</mi> </msub> </semantics></math>.</p> "> Figure 5
<p>Structural analysis problem: solution for the force function <math display="inline"><semantics> <mrow> <mi>F</mi> <mo>(</mo> <mi>x</mi> <mo>)</mo> </mrow> </semantics></math> obtained by QA compared to the analytical solution <math display="inline"><semantics> <mrow> <msup> <mi>F</mi> <mo>*</mo> </msup> <mrow> <mo>(</mo> <mi>x</mi> <mo>)</mo> </mrow> </mrow> </semantics></math>.</p> "> Figure 6
<p>Structural design optimization problem: setup for a composed rod with variable cross sections.</p> "> Figure 7
<p>Structural design optimization problem: QUBO patterns. (<b>a</b>) Pattern of interactions between logical qubits, i.e., <math display="inline"><semantics> <msup> <mi mathvariant="bold-italic">q</mi> <mi>a</mi> </msup> </semantics></math>, <math display="inline"><semantics> <msup> <mi mathvariant="bold-italic">q</mi> <mi>A</mi> </msup> </semantics></math>, and <math display="inline"><semantics> <mover accent="true"> <mi mathvariant="bold-italic">q</mi> <mo>^</mo> </mover> </semantics></math>; (b) sub-pattern of interactions between input qubits, i.e., <math display="inline"><semantics> <msup> <mi mathvariant="bold-italic">q</mi> <mi>a</mi> </msup> </semantics></math> and <math display="inline"><semantics> <msup> <mi mathvariant="bold-italic">q</mi> <mi>A</mi> </msup> </semantics></math>.</p> "> Figure 8
<p>Structural design optimization problem: solution for the force function <math display="inline"><semantics> <mrow> <mi>F</mi> <mo>(</mo> <mi>x</mi> <mo>)</mo> </mrow> </semantics></math> obtained by QA compared to the analytical solution <math display="inline"><semantics> <mrow> <msup> <mi>F</mi> <mo>*</mo> </msup> <mrow> <mo>(</mo> <mi>x</mi> <mo>)</mo> </mrow> </mrow> </semantics></math>.</p> ">
Abstract
:1. Introduction
2. Materials and Methods
2.1. The Principle of Minimum Complementary Energy
2.2. The Structural Design Optimization Problem
2.3. Problem Formulations for a Rod under Self-Weight Loading
2.4. QUBO Formulations for a Rod under Self-Weight Loading
3. Results
3.1. Results for the Structural Analysis Problem
3.2. Results for the Structural Design Optimization Problem
4. Discussion
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
Abbreviations
DA | Digital annealing |
FEM | Finite element method |
MINLP | Mixed integer nonlinear programming |
MILP | Mixed integer linear programming |
NTR-KZFD | Negative term reductions by Kolmogorov, Zabih, Freedman, and Drineas |
PTR | Positive term reductions |
QA | Quantum annealing |
QPU | Quantum processing unit |
QUBO | Quadratic unconstrained binary optimization |
SA | Simulated annealing |
SDK | Software developing kit |
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L | f | |||
---|---|---|---|---|
1.5 | 5 | 0.25 | 1.0 | 2.5 |
10 | 50 | 500 | 400 μs |
L | f | |||
---|---|---|---|---|
1.5 | 2 | {0.25, 0.5} | 1.0 | 2.5 |
3 | 8 | 26 | 5 | 800 | 400 μs |
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Key, F.; Freinberger, L. A Formulation of Structural Design Optimization Problems for Quantum Annealing. Mathematics 2024, 12, 482. https://doi.org/10.3390/math12030482
Key F, Freinberger L. A Formulation of Structural Design Optimization Problems for Quantum Annealing. Mathematics. 2024; 12(3):482. https://doi.org/10.3390/math12030482
Chicago/Turabian StyleKey, Fabian, and Lukas Freinberger. 2024. "A Formulation of Structural Design Optimization Problems for Quantum Annealing" Mathematics 12, no. 3: 482. https://doi.org/10.3390/math12030482