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Your search keyword '"Xia, Aiguo"' showing total 21 results
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21 results on '"Xia, Aiguo"'

2. Reduced Order Modeling of System by Dynamic Modal Decom-Position with Fractal Dimension Feature Embedding.

Author

Zhang, Mingming, Bai, Simeng, Xia, Aiguo, Tuo, Wei, and Lv, Yongzhao

Subjects
FRACTAL dimensions, DYNAMICAL systems, REDUCED-order models, COMPRESSOR blades, DYNAMIC models, COMPUTATIONAL complexity
Abstract

The balance between accuracy and computational complexity is currently a focal point of research in dynamical system modeling. From the perspective of model reduction, this paper addresses the mode selection strategy in Dynamic Mode Decomposition (DMD) by integrating an embedded fractal theory based on fractal dimension (FD). The existing model selection methods lack interpretability and exhibit arbitrariness in choosing mode dimension truncation levels. To address these issues, this paper analyzes the geometric features of modes for the dimensional characteristics of dynamical systems. By calculating the box counting dimension (BCD) of modes and the correlation dimension (CD) and embedding dimension (ED) of the original dynamical system, it achieves guidance on the importance ranking of modes and the truncation order of modes in DMD. To validate the practicality of this method, it is applied to the reduction applications on the reconstruction of the velocity field of cylinder wake flow and the force field of compressor blades. Theoretical results demonstrate that the proposed selection technique can effectively characterize the primary dynamic features of the original dynamical systems. By employing a loss function to measure the accuracy of the reconstruction models, the computed results show that the overall errors of the reconstruction models are below 5%. These results indicate that this method, based on fractal theory, ensures the model's accuracy and significantly reduces the complexity of subsequent computations, exhibiting strong interpretability and practicality. [ABSTRACT FROM AUTHOR]

Published
2024
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15. Correction: Heterogeneity in surface sensing suggests a division of labor in Pseudomonas aeruginosa populations

Author

Armbruster, Catherine R, primary, Lee, Calvin K, additional, Parker-Gilham, Jessica, additional, de Anda, Jaime, additional, Xia, Aiguo, additional, Zhao, Kun, additional, Murakami, Keiji, additional, Tseng, Boo Shan, additional, Hoffman, Lucas R, additional, Jin, Fan, additional, Harwood, Caroline S, additional, Wong, Gerard CL, additional, and Parsek, Matthew R, additional

Published
2020
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17. Heterogeneity in surface sensing suggests a division of labor in Pseudomonas aeruginosa populations

Author

Armbruster, Catherine R, primary, Lee, Calvin K, additional, Parker-Gilham, Jessica, additional, de Anda, Jaime, additional, Xia, Aiguo, additional, Zhao, Kun, additional, Murakami, Keiji, additional, Tseng, Boo Shan, additional, Hoffman, Lucas R, additional, Jin, Fan, additional, Harwood, Caroline S, additional, Wong, Gerard CL, additional, and Parsek, Matthew R, additional

Published
2019
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18. Aeroelastic simulation of the first 1.5-stage aeroengine fan at rotating stall

Author

LIANG, Feng, XIE, Zhifeng, XIA, Aiguo, and ZHOU, Ming

Abstract

A massive parallel aeroelastic simulation platform has been built to investigate the first 1.5-stage fan of an aeroengine at rotating stall. The Computational Fluid Dynamics (CFD) solver and Computational Structural Dynamics (CSD) solver are coupled directly by non-matching mesh interfaces. The unsteady rotor/stator interaction is solved by the Sliding Mesh Interface method. The original rotor blades are shrouded by the midspan shrouds. An unshrouded fan is also created to investigate the effects of the midspan shrouds. Both the shrouded fan and unshrouded fan have stable aeroelasticity at the designed state. At rotating stall, the stalled region rotates at 30% of the rotor speed on the absolute reference frame. The energy spectrum of the rotating stalled flow is measured quantitatively. It shows that the first two order excitations are much stronger than the higher order excitations. In the flow of rotating stall, the fifth backward travelling wave mode of shrouded fan is resonated by the fifth excitation of the rotational stalled flow because the rotational speed of the stalled region coincides with the modal rotational speed, while for the unshrouded fan, the first bending mode is resonated by the second excitation of the rotational stalled flow, forming two waves in the circumference of the annulus blades. At rotating stall, the vibration of the shrouded blades is still under control but the vibration of the unshrouded blades is diverged and out of control. A novel tool, i.e., resonance map, is proposed to predict the resonance. It provides a perspective to explain the effects of midspan shrouds at a theoretical level, and it would also be helpful in the structural design of blades.

Published
2024
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