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Multi-perception large kernel convnet for efficient image super-resolution

四川大学学报(自然科学版) 2025年第1期62卷 67-78页

作者： MIAO Xuan LI Zheng XU Wen-Zheng College of Computer Science(College of Software) Sichuan UniversityChengdu 610065China Tianfu Engineering-Oriented Numerical Simulation&Software Innovation Center Sichuan UniversityChengdu 610207China

Significant advancements have been achieved in the field of Single Image Super-Resolution(SISR)through the utilization of Convolutional Neural Networks(CNNs)to attain state-of-the-art *** efforts have explored the incorporation of Transformers to augment network performance in ***,the high computational cost of Transformers makes them less suitable for deployment on lightweight ***,the majority of enhancements for CNNs rely predominantly on small spatial convolutions,thereby neglecting the potential advantages of large kernel *** this paper,the authors propose a Multi-Perception Large Kernel convNet(MPLKN)which delves into the exploration of large kernel ***,the authors have architected a Multi-Perception Large Kernel(MPLK)module aimed at extracting multi-scale features and employ a stepwise feature fusion strategy to seamlessly integrate these *** addition,to enhance the network's capacity for nonlinear spatial information processing,the authors have designed a Spatial-Channel Gated Feed-forward Network(SCGFN)that is capable of adapting to feature interactions across both spatial and channel *** results demonstrate that MPLKN outperforms other lightweight image super-resolution models while maintaining a minimal number of parameters and FLOPs.

关键词： Single Image Super-Resolution Lightweight model Deep learning Large kernel

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Swin Transformer-based Cross-view Attention Network for Stereo Image Super-Resolution 6

Swin Transformer-based Cross-view Attention Network for Ster...

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6th IEEE International Conference on Pattern Recognition and Artificial Intelligence, PRAI 2023

作者： Li, Xue Zhang, Hongying Zhang, Laiping Ye, Zixun Pu, Juntao Yuan, Mingdong Southwest University of Science and Technology School of Information Engineering Mianyang China Sichuan University Tianfu Engineering Center for Numerical Simulation and Software Innovation Chengdu China

ISBN: (纸本)9798350325485

Stereo image pairs offer complementary information that can improve the performance of image super-resolution reconstruction significantly. However, integrating longrange dependencies between stereo image pairs into super-resolution is challenging. This paper proposes a Swin Transformer-based cross-view attention network for stereo image super-resolution (TCASSRnet) to address this issue. Firstly, TCASSRnet extracts stereo image pair features using a Transformer with a shallow residual block (SRB). Next, a cross-view attention model (CAM) is introduced to integrate complementary features of stereo image pairs, resulting in high-frequency and low-frequency attention maps. Finally, deep residual blocks (DRBs) are employed to restore image details layer by layer and reconstruct super-resolution images. Extensive experimental results demonstrate the effectiveness of TCASSRnet. Specifically, TCASSRnet outperforms the baseline network (PASSRnet) by 0.55 dB in terms of PSNR on the Middlebury dataset for 4× SR, while the parameter size of TCASSRnet is reduced by 50% compared to the recent SSRDE-Fnet. © 2023 IEEE.

关键词： Image enhancement

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A COMPUTATIONAL STUDY ON BLADE-VORTEX INTERACTION FOR COAXIAL ROTORS IN HOVER USING A NOVEL HIGH-ORDER SCHEME 33

A COMPUTATIONAL STUDY ON BLADE-VORTEX INTERACTION FOR COAXIA...

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33rd Congress of the International Council of the Aeronautical Sciences, ICAS 2022

作者： Han, Shaoqiang Song, Wenping Han, Zhonghua Tianfu Engineering-oriented Numerical & Software Innovation Center College of Computer Science Sichuan University Chengdu710071 China Northwestern Polytechnical University Xi'an710071 China

ISBN: (纸本)9781713871163

Accurate prediction of tip vortices is crucial for mechanism study on the blade-vortex interaction(BVI) for coaxial rotors. A new high-order scheme (WENO-K) proposed by our research group is employed to minimize numerical dissipation and extended to numerical simulation of unsteady flows dominated by tip vortices around hovering coaxial rotors. WENO-K is referred to as an adaptively optimized WENO scheme with Gauss-Kriging reconstruction, and its advantage is to reduce dissipation in smooth regions of flow while preserving high-resolution around discontinuities. Here WENO-K scheme is adopted to reconstruct left and right state values within the Roe Riemann solver updating the inviscid fluxes on a structured dynamic overset grid. To minimize the accuracy loss for high-order reconstruction on artificial boundaries of overset grid, a method of multilayer fringes is proposed to carry out interpolation between background grid and blade grid. A conservative method is developed for the flow variable interpolation in the overset grid interface. High-accurate numerical simulation of vortex wake structure over a coaxial rotor was carried out. The results indicates that the tip vortex structure and its unsteady generation, development and evolution process can be completely simulated and preserved by WENO-K scheme, and the pressure impulses on the blade caused by BVI can also be well captured. © 2022 ICAS. All Rights Reserved.

关键词： Unsteady flow

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A Structured Grid Generation Scheme Based on Multi-Block Topology and Elliptic Pde Optimizer for Rotating Machinery

SSRN

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SSRN 2023年

作者： Huang, Longlong Wang, Nianhua Liu, Cheng Si, Songlin Liu, Dong Huang, Siyuan Tianfu Engineering-Oriented Numerical Simulation & Software Innovation Center Sichuan University Sichuan Chendu China

With the widespread application of numerical simulation in aeroengine, it is crucial to automatically and efficiently generate structured grids for rotating components. Therefore, a comprehensive automatic structured grid generation scheme has been established. This system is based on multi-block structured grid generation methods including automatic generation of geometric models, construction of topologies, generation and optimization of grids. The generated grids were compared with commercial software, and the results show that this system implements an integrated platform from geometric modeling to multi-block structured grid generation. Firstly, For the Rotor37 model, LONGCHI-Grid has increased the efficiency of grid generation by about 60%, and the four evaluation indicators have been improved by 34.5%, 55.6%, 57.0%, and 69.2% compared to the traditional manual meshing mode, respectively. Furthermore, compared to the AutoGrid, this system has improved the Max aspect ratio and Max expansion factor by 39.6% and 25.0%, respectively. However, for fans with large blade distortion, there is not significantly different between them, except for a 56.9% decrease in max aspect ratio. For complex multi-stage compressors, the max aspect ratio has improved by 48.7%, while slightly decrease in other indicators. Finally, numerical simulations were conducted to compare the results of both schemes, and the consistency results verified the feasibility of the established program. This system provides technical support for the application of numerical simulation techniques in aeroengine. © 2023, The Authors. All rights reserved.

关键词： Aspect ratio

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Design and Implementation of Script Module with Recording and Playback Function in CAE software

Design and Implementation of Script Module with Recording an...

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2023 International Conference on Computer, Artificial Intelligence, and Control engineering, CAICE 2023

作者： Wang, Jingyu Fu, Chengjie Wang, Tiejun Wang, Yuntao Chen, Liangzhong School of Aeronautics and Astronautics Sichuan University Chengdu China Tianfu Engineering-Oriented Numerical Simulation & Software Innovation Center Sichuan University Chengdu China School of Computer Science Chengdu University of Information Technology Chengdu China College of Computer Science Sichuan University Chengdu China

ISBN: (纸本)9781510665040

In large-scale engineering experiments, such as hydrodynamics and aerodynamics experiments, computer aided software (CAE) is always used to manage a large number of parameters and experimental data to simulate the physical field through finite element analysis. To improve work efficiency, one of the most practical methods at present is to record user operations in the CAE software to script files with domain specific language (DSL), such as Python, and replay those script files to reproduce user operations. In this paper, a common script module ScriptEngine supporting the recording and playback function is introduced, and it can be embedded into any CAE software to automatically complete grid division, flow field calculation, pre-processing and post-processing by running the scripts. Furthermore, a demo program embedding ScriptEngine into an opensource FastCAE was developed and the results show that running the scripts recorded by ScriptEngine could obtain the same results as the user operations and ScriptEngine can be used as a common script module in any CAE software and other desktop software which needs the recording and playback function. © 2023 SPIE.

关键词： Python

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EFFECTS OF GEOMETRY PARAMETERS ON AERODYNAMIC CHARACTERISTICS OF ROTOR AIRFOIL IN REVERSE FLOW 34th

EFFECTS OF GEOMETRY PARAMETERS ON AERODYNAMIC CHARACTERISTIC...

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34th Congress of the International Council of the Aeronautical Sciences, ICAS 2024

作者： Liu, Cheng-Peng Song, Wen-Ping Han, Shao-Qiang Han, Zhong-Hua School of Aeronautics Northwestern Polytechnical University Xi’an710072 China Tianfu Engineering-oriented Numerical Software Innovation Center College of Computer Science Sichuan University China National Key Laboratory of Aircraft Configuration Design Xi’an710072 China

When rotorcrafts fly at high speeds, the retreating blades experience reverse flow due to their high advance ratio. Flow separates even at small angle of attack in reverse flow, which leads to negative lift, drag and pitching moment penalties. The aerodynamic characteristics of an airfoil are closely related to its geometric shape. Therefore, to mitigate aerodynamic deterioration caused by reverse flow and enhance the flight performance of rotorcrafts at high speeds, it is crucial to study the effects of geometric parameters on the aerodynamic characteristics of rotor airfoils in reverse flow. Given that conventional URANS method with low-precision scheme cannot adequately capture the vortex-induced large separation flow in reverse flow conditions, an improved high-order WENO scheme and IDDES method are used in airfoil reverse flow simulation. Initially, the simulation method is validated against experiment data of NACA 0012 airfoil in reverse flow. Subsequently, the OA312 airfoil is selected as a baseline and morphed by leading-edge radius, camber, camber crest position, thickness, thickness crest position and shape of trailing-edge. The aerodynamic coefficients of these modified airfoils are simulated and compared to analyze the influence of different geometry parameters. The results can be used to guide the design of new rotor airfoil with high performance. © 2024, International Council of the Aeronautical Sciences. All rights reserved.

关键词： Cambers

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Improving the Microwave Heating Uniformity of Cylindrical Samples

SSRN

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SSRN 2023年

作者： Yang, Fengming Yan, Xueting Zhu, Huacheng Yang, Yang Huang, Kama College of Electronics and Information Engineering Sichuan University Chengdu610065 China Tianfu Engineering-oriented Numerical Simulation & Software Innovation Center Chengdu620107 China

Cylindrical tubes are commonly used in microwave continuous heating sterilization. However, the cylindrical load is prone to thermal focusing, resulting in uneven heating. To solve this problem, in this study, metal rings around a cylindrical tube are proposed for uniform continuous-flow microwave heating. First, a multiphysics field model was built for microwave heating, where metal rings surround the cylindrical tube. Second, the electric field distribution, temperature distribution and reflection coefficient are analyzed to optimize the parameters of the model. Moreover, this model was designed to simulate the liquid heating effect with different dielectric coefficients. Finally, physical experiments are conducted to validate the accuracy of the simulation, showing that the experimental results are in good agreement with the simulated results. The proposed structure prevents the electromagnetic wave from focusing in the center of the cylindrical tube, improving the uniformity, and the COV was reduced by 31% (from 1.031 to 0.709) compared to the traditional method of microwave heating without metal rings. © 2023, The Authors. All rights reserved.

关键词： Microwave heating

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numerical INVESTIGATION ON AERODYNAMIC PERFORMANCE OF HOVERING ROTOR IN GROUND EFFECT 34th

NUMERICAL INVESTIGATION ON AERODYNAMIC PERFORMANCE OF HOVERI...

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34th Congress of the International Council of the Aeronautical Sciences, ICAS 2024

作者： Li, Xin-Long Xu, Jian-Hua Song, Wen-Ping Han, Shao-Qiang Han, Zhong-Hua School of Aeronautics Northwestern Polytechnical University Xi’an710071 China National Key Laboratory of Aircraft Configuration Design Xi’an710072 China Tianfu Engineering-oriented Numerical and Software Innovation Center College of Computer Science Sichuan University Chengdu610065 China

As the helicopter hovers near the ground, the interactions among the rotor, the wake, and the ground complicate the flow field, altering the rotor’s aerodynamic forces significantly. To investigate the influence of ground effect on the rotor aerodynamic characteristics, the flow around the rotor in hover is numerically simulated by using the in-house Computational Fluid Dynamics (CFD) codes with a structured dynamic overset grid system. A novel 5th-order WENO-K scheme based on nonlinear reconfiguration is employed for spatial discretization, effectively reducing the numerical dissipation and achieving high-accuracy capture of the tip vortices. In this study, the aerodynamic forces and flow fields of the S-76 rotor in ground effect and out ground effect are compared. The influence and mechanisms of ground effect on rotor aerodynamic characteristics are analyzed in detail. Results show that the ground effect causes a strong upwash flow in the inboard region of the blade and compresses the tip vortices, result in a significant increase in thrust at the blade root and a slight decrease in thrust at the blade tip, respectively. © 2024, International Council of the Aeronautical Sciences. All rights reserved.

关键词： Computational fluid dynamics

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A high-resolution numerical investigation of unsteady wake vortices for coaxial rotors in hover

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Chinese Journal of Aeronautics 2024年第11期37卷 278-299页

作者： Shaoqiang HAN Wenping SONG Zhonghua HAN Jianhua XU Tianfu Engineering-oriented Numerical&Software Innovation Center College of Computer ScienceSichuan UniversityChengdu 610065China National Key Laboratory of Science and Technology on Aerodynamic Design and Research School of AeronauticsNorthwestern Polytechnical UniversityXi’an 710072China

High-resolution numerical simulations for wake vortical flows have long been a challenge in rotor aerodynamics.A novel spectrum-optimized sixth-order Weighted Essentially NonOscillatory(WENO)scheme is proposed to discretize inviscid fluxes on moving overset grids,and the Improved Delayed Detached Eddy simulation(IDDES)is employed to resolve turbulent *** integration of these methods facilitates a comprehensive numerical investigation into the unsteady vortical flows over coaxial rotors in *** results highlight the substantial improvement in numerical resolution,in terms of both spatial structure and temporal evolution of unsteady multiscale wake *** rotors in hover manifest three primary scales of wake vortex structures:(A)the helical evolution of primary blade tip vortices and the periodic occurrence of strong Blade-Vortex Interactions(BVI);(B)the continuous shedding of small-scale horseshoeshaped vortices from the trailing edges of rotor blades,forming the vortex sheets;(C)the emergence of small-scale secondary vortex braids induced by interactions between rotor tip vortices and the vortex *** vortex structures and their interactions cause high-frequency oscillations in rotor disk loads and induce unsteady perturbations in the local flow *** among these primary vortices,coupled with the generation of secondary vortices,result in the dissipation,distortion,and breakup of the rotor tip vortices,ultimately forming a vortex ***,a substantial quantity of seemingly weak small-scale secondary vortex braids significantly contribute to energy dissipation during the evolution of wake vortices for coaxial rotors in hover.ó2024 Chinese Society of Aeronautics and *** and hosting by Elsevier *** is an open access article under the CC BY-NC-ND license(http://***/licenses/by-nc-nd/4.0/).

关键词： Coaxial rotor Blade tip vortex Secondary vortex High-order scheme IDDES Moving overset grid

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Parameter calibration of the tensile-shear interactive damage constitutive model for sandstone failure

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Journal of Rock Mechanics and Geotechnical engineering 2024年第4期16卷 1153-1174页

作者： Yun Shu Zheming Zhu Meng Wang Weiting Gao Fei Wang Duanying Wan Yuntao Wang MOE Key Laboratory of Deep Earth Science and Engineering College of Architecture and EnvironmentSichuan UniversityChengdu610065China Failure Mechanics and Engineering Disaster Prevention Key Laboratory of Sichuan ProvinceSichuan UniversityChengdu610065China Tianfu Engineering-oriented Numerical Simulation & Software Innovation Center Chengdu620107China

The tensile-shear interactive damage(TSID)model is a novel and powerful constitutive model for rock-like *** study proposes a methodology to calibrate the TSID model parameters to simulate *** basic parameters of sandstone are determined through a series of static and dynamic tests,including uniaxial compression,Brazilian disc,triaxial compression under varying confining pressures,hydrostatic compression,and dynamic compression and tensile tests with a split Hopkinson pressure *** on the sandstone test results from this study and previous research,a step-by-step procedure for parameter calibration is outlined,which accounts for the categories of the strength surface,equation of state(EOS),strain rate effect,and *** calibrated parameters are verified through numerical tests that correspond to the experimental loading *** between numerical results and experimental data indicates the precision and reliability of the calibrated *** methodology presented in this study is scientifically sound,straightforward,and essential for improving the TSID ***,it has the potential to contribute to other rock constitutive models,particularly new user-defined models.

关键词： Damage constitutive model Parameter calibration Rock modeling Sandstone Dynamic impact load Tensile-shear interactive damage(TSID)model

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