Intelligent Approach to Robust Design Optimization of a Rotor System due to Its Support Stiffness Uncertainty
In this paper, an intelligent robust design approach combined with different techniques such as polynomial chaos expansion (PCE), radial basis function (RBF) neural network, and evolutionary algorithms is presented with a focus on the optimization of the dynamic response of a rotor system considerin...
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| Format: | Article |
| Language: | English |
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Wiley
2020-01-01
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| Series: | Shock and Vibration |
| Online Access: | http://dx.doi.org/10.1155/2020/2564679 |
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| _version_ | 1849400427149262848 |
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| author | Bensheng Xu Chaoping Zang Genbei Zhang |
| author_facet | Bensheng Xu Chaoping Zang Genbei Zhang |
| author_sort | Bensheng Xu |
| collection | DOAJ |
| description | In this paper, an intelligent robust design approach combined with different techniques such as polynomial chaos expansion (PCE), radial basis function (RBF) neural network, and evolutionary algorithms is presented with a focus on the optimization of the dynamic response of a rotor system considering support stiffness uncertainty. In the proposed method, the PCE method instead of the traditional Monte Carlo uncertainty analysis is applied to analyze the uncertain propagation of system performance. The RBF network is introduced to establish the approximate models of the objective and constraint functions. Taking the low-pressure rotor of a gas turbine with support stiffness uncertainty as an example, the optimization model is established with the mean and variance of unbalanced response of the rotor system at different operating speeds as the objective function, and the maximum unbalance response is less than the upper limit as the constraint function. The polynomial chaos expansion is generated to facilitate a rapid analysis of robustness in the presence of support stiffness uncertainties that is defined in terms of tolerance with good accuracy. The optimal Hypercubus are used as experimental plans for building RBF approximation models of the objective and constraint functions. Finally, the robust solutions are obtained with the multiobject optimization algorithm NSGA-II. Monte Caro simulation analysis demonstrates that the qualified rate of maximum vibration responses of the low-pressure rotor system can be increased from 83.6% to over 99%. This approach to robust design optimization is shown to lead to designs that significantly decrease vibration responses of the rotor system and improved system performance with reduced sensitivity to support stiffness uncertainty. |
| format | Article |
| id | doaj-art-864579913da544f28daae9fb176ed2a6 |
| institution | Kabale University |
| issn | 1070-9622 1875-9203 |
| language | English |
| publishDate | 2020-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Shock and Vibration |
| spelling | doaj-art-864579913da544f28daae9fb176ed2a62025-08-20T03:38:04ZengWileyShock and Vibration1070-96221875-92032020-01-01202010.1155/2020/25646792564679Intelligent Approach to Robust Design Optimization of a Rotor System due to Its Support Stiffness UncertaintyBensheng Xu0Chaoping Zang1Genbei Zhang2College of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics, Jiangsu Province Key Laboratory of Aerospace Power System, Nanjing 210016, ChinaCollege of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics, Jiangsu Province Key Laboratory of Aerospace Power System, Nanjing 210016, ChinaCollege of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics, Jiangsu Province Key Laboratory of Aerospace Power System, Nanjing 210016, ChinaIn this paper, an intelligent robust design approach combined with different techniques such as polynomial chaos expansion (PCE), radial basis function (RBF) neural network, and evolutionary algorithms is presented with a focus on the optimization of the dynamic response of a rotor system considering support stiffness uncertainty. In the proposed method, the PCE method instead of the traditional Monte Carlo uncertainty analysis is applied to analyze the uncertain propagation of system performance. The RBF network is introduced to establish the approximate models of the objective and constraint functions. Taking the low-pressure rotor of a gas turbine with support stiffness uncertainty as an example, the optimization model is established with the mean and variance of unbalanced response of the rotor system at different operating speeds as the objective function, and the maximum unbalance response is less than the upper limit as the constraint function. The polynomial chaos expansion is generated to facilitate a rapid analysis of robustness in the presence of support stiffness uncertainties that is defined in terms of tolerance with good accuracy. The optimal Hypercubus are used as experimental plans for building RBF approximation models of the objective and constraint functions. Finally, the robust solutions are obtained with the multiobject optimization algorithm NSGA-II. Monte Caro simulation analysis demonstrates that the qualified rate of maximum vibration responses of the low-pressure rotor system can be increased from 83.6% to over 99%. This approach to robust design optimization is shown to lead to designs that significantly decrease vibration responses of the rotor system and improved system performance with reduced sensitivity to support stiffness uncertainty.http://dx.doi.org/10.1155/2020/2564679 |
| spellingShingle | Bensheng Xu Chaoping Zang Genbei Zhang Intelligent Approach to Robust Design Optimization of a Rotor System due to Its Support Stiffness Uncertainty Shock and Vibration |
| title | Intelligent Approach to Robust Design Optimization of a Rotor System due to Its Support Stiffness Uncertainty |
| title_full | Intelligent Approach to Robust Design Optimization of a Rotor System due to Its Support Stiffness Uncertainty |
| title_fullStr | Intelligent Approach to Robust Design Optimization of a Rotor System due to Its Support Stiffness Uncertainty |
| title_full_unstemmed | Intelligent Approach to Robust Design Optimization of a Rotor System due to Its Support Stiffness Uncertainty |
| title_short | Intelligent Approach to Robust Design Optimization of a Rotor System due to Its Support Stiffness Uncertainty |
| title_sort | intelligent approach to robust design optimization of a rotor system due to its support stiffness uncertainty |
| url | http://dx.doi.org/10.1155/2020/2564679 |
| work_keys_str_mv | AT benshengxu intelligentapproachtorobustdesignoptimizationofarotorsystemduetoitssupportstiffnessuncertainty AT chaopingzang intelligentapproachtorobustdesignoptimizationofarotorsystemduetoitssupportstiffnessuncertainty AT genbeizhang intelligentapproachtorobustdesignoptimizationofarotorsystemduetoitssupportstiffnessuncertainty |