Computers & Structures最新文献_第5页

Computational forensics framework for material property identification of reinforced structures leveraging DIC-based FEM updating via metaheuristic optimization

IF 4.4 2区工程技术

Computers & Structures Pub Date : 2025-02-25 DOI: 10.1016/j.compstruc.2025.107696

Tabish Ali , Robin Eunju Kim , Kun-Soo Kim

{"title":"Computational forensics framework for material property identification of reinforced structures leveraging DIC-based FEM updating via metaheuristic optimization","authors":"Tabish Ali , Robin Eunju Kim , Kun-Soo Kim","doi":"10.1016/j.compstruc.2025.107696","DOIUrl":"10.1016/j.compstruc.2025.107696","url":null,"abstract":"<div><div>Identification of the material properties of reinforced concrete (RC) systems is a challenging but crucial part of the strength analysis and condition assessment. However, the heterogeneous nature of concrete poses complexities in determining its material properties accurately. A combination of finite element model updating with metaheuristic optimization algorithms has emerged as one method to determine the material properties of structures. However, the previous works are limited to homogenous materials such as steel and use simple constitutive laws for the finite element model. Thus, the authors proposed a Computational Forensics (CF) framework to investigate the material property identification of RC beams using full-field surface deformation data obtained from the Digital Image Correlation technique. The proposed framework successfully determined the elastic modulus and compressive strength with high accuracy. Both synthetic and real experiments were performed to show the applicability and practicality of the framework for material property identification and SHM purposes.</div></div>","PeriodicalId":50626,"journal":{"name":"Computers & Structures","volume":"310 ","pages":"Article 107696"},"PeriodicalIF":4.4,"publicationDate":"2025-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143480543","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Damage localization using a deep learning-based response modeling method

IF 4.4 2区工程技术

Computers & Structures Pub Date : 2025-02-25 DOI: 10.1016/j.compstruc.2025.107697

Chengbin Chen, Liqun Tang, Qingkai Xiao, Licheng Zhou, Zejia Liu, Yiping Liu, Zhenyu Jiang, Bao Yang

{"title":"Damage localization using a deep learning-based response modeling method","authors":"Chengbin Chen, Liqun Tang, Qingkai Xiao, Licheng Zhou, Zejia Liu, Yiping Liu, Zhenyu Jiang, Bao Yang","doi":"10.1016/j.compstruc.2025.107697","DOIUrl":"10.1016/j.compstruc.2025.107697","url":null,"abstract":"<div><div>Existing multi-damage localization methods usually need to be trained using labeled data obtained from various damage cases, and such methods can identify multiple damages with high accuracy. However, it’s extremely challenging to obtain labeled data from engineered structures under various damage states, especially in multiple damages case. Thus, damage localization methods that need to be trained using only structural health data have received much attention as an alternative. In addition, existing multi-damage localization methods are mainly based on structural dynamic responses, such as acceleration, whereas structural quasi-static responses are also sensitive to damage location and perform well in damage localization, such as strain response. However, existing quasi-static response-based damage localization methods usually focus on the single-damage localization problem, ignoring the double- and multi-damage localization problems. Therefore, this paper develops a multi-damage localization method based on strain response modeling using the DL-AR-ATT model. The proposed method was compared with one of the latest methods, the BiLSTNet-A-based method, and validated using both simulation and experimental datasets. The results illustrate that the proposed method can accurately locate single and double damage and outperformed the BiLSTNet-A-based method, especially in high noise levels and minor damage cases.</div></div>","PeriodicalId":50626,"journal":{"name":"Computers & Structures","volume":"310 ","pages":"Article 107697"},"PeriodicalIF":4.4,"publicationDate":"2025-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143480536","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Upgraded double tuned mass dampers for vibration control of structures under earthquakes

IF 4.4 2区工程技术

Computers & Structures Pub Date : 2025-02-24 DOI: 10.1016/j.compstruc.2025.107700

Ngoc-An Tran , Van-Bao Hoang , Hai-Le Bui , Huong Quoc Cao

{"title":"Upgraded double tuned mass dampers for vibration control of structures under earthquakes","authors":"Ngoc-An Tran , Van-Bao Hoang , Hai-Le Bui , Huong Quoc Cao","doi":"10.1016/j.compstruc.2025.107700","DOIUrl":"10.1016/j.compstruc.2025.107700","url":null,"abstract":"<div><div>In this study, an upgraded version of a Double Tuned Mass Damper (UDTMD) is developed to mitigate the dynamic response of structures under earthquake loadings. This device is a passive vibration absorber combined by two masses, two springs and a dashpot. Like a Tuned Mass Damper (TMD) or Double Tuned Mass Damper (DTMD), the UDTMD has notable advantages such as stability, cost-effective and low maintenance requirements. To achieve the maximum effectiveness of UDTMD, its parameters are optimized based on the peak displacement and the absolute acceleration of the main structures under the El Centro earthquake (1940). By comparing the effectiveness of UDTMD with those of DTMD and TMD, the structural vibration absorption capacity of this device is demonstrated. The numerical simulations from this study show that, in mitigating structural responses, the proposed UDTMD is more effective than a conventional TMD or DTMD with the same weight as UDTMD. Furthermore, the stability of this device is assessed by testing the UDTMD-structure system under various earthquake loadings. The results obtained indicate that UDTMD still remains high performance when the primary structure is subjected to different earthquakes.</div></div>","PeriodicalId":50626,"journal":{"name":"Computers & Structures","volume":"310 ","pages":"Article 107700"},"PeriodicalIF":4.4,"publicationDate":"2025-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143474881","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Multi-agent deep reinforcement learning for resilience optimization of building structures considering utility interactions for functionality

IF 4.4 2区工程技术

Computers & Structures Pub Date : 2025-02-22 DOI: 10.1016/j.compstruc.2025.107703

Ghazanfar Ali Anwar , Muhammad Zeshan Akber

{"title":"Multi-agent deep reinforcement learning for resilience optimization of building structures considering utility interactions for functionality","authors":"Ghazanfar Ali Anwar , Muhammad Zeshan Akber","doi":"10.1016/j.compstruc.2025.107703","DOIUrl":"10.1016/j.compstruc.2025.107703","url":null,"abstract":"<div><div>The resilience optimization of the built environment under extreme events with building structures and interdependent physical infrastructure systems is inefficient due to the large action spaces of pre-hazard mitigation alternatives. Hence, a Multi-Agent Deep Deterministic Policy Gradient (MADDPG) based resilience optimization framework is proposed herein to enhance the resilience of the built environment with large mitigation action spaces. The proposed framework is divided into two parts including (1) Performance-Based Environment (PBE) to assess the resilience of the building structures under given hazard scenarios considering dependencies and interdependencies of the physical infrastructure systems, and (2) MADDPG for resilience optimization of the interdependent building structures given minimal mitigation and repair costs. The PBE is developed to assess the consequences of the mitigation actions under hazard by utilizing steps including component consequence and recovery assessment, network modeling and functionality assessment, and portfolio consequence and resilience assessment. The multi-agents for resilience optimization utilize Deep Deterministic Policy Gradients (DDPG) including actor and critic networks to learn to optimize the mitigation actions by maximizing the cumulative reward function given the hazard scenarios. The proposed framework is illustrated on a built environment with building structures and two physical infrastructure systems including a Water Network (WN) and an Electrical Power Network (EPN) system. The provided framework efficiently optimizes complex, interdependent, and large infrastructure systems under extreme events by utilizing physics-based environments and artificial intelligence.</div></div>","PeriodicalId":50626,"journal":{"name":"Computers & Structures","volume":"310 ","pages":"Article 107703"},"PeriodicalIF":4.4,"publicationDate":"2025-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143464293","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Nitsche-based isogeometric analysis of bending and free vibration of stiffened FGM plates with cutouts

IF 4.4 2区工程技术

Computers & Structures Pub Date : 2025-02-21 DOI: 10.1016/j.compstruc.2025.107677

Yuan Wang , Fujian Si , Zhijun Zhang , Chaofeng Pan , Wangfan Zhou , Heng Gu , Jiangping Xu , Hao Zhu

{"title":"Nitsche-based isogeometric analysis of bending and free vibration of stiffened FGM plates with cutouts","authors":"Yuan Wang , Fujian Si , Zhijun Zhang , Chaofeng Pan , Wangfan Zhou , Heng Gu , Jiangping Xu , Hao Zhu","doi":"10.1016/j.compstruc.2025.107677","DOIUrl":"10.1016/j.compstruc.2025.107677","url":null,"abstract":"<div><div>We have developed a coupled framework of Nitsche and isogeometric analysis for investigating the static bending and natural vibration of functionally graded material (FGM) plates reinforced with stiffeners and cutouts. The FGM plates are discretized using non-overlapping non-uniform rational B-splines (NURBS) patches, with stiffeners strategically positioned along the shared edges of neighboring patches. Consequently, the Nitsche technique is adopted to integrate these patches seamlessly. Our methodology, which combines the first-order shear deformation theory (FSDT) and Timoshenko beam theory, is utilized to examine the static bending and natural vibration of the perforated stiffened FGM plates. This approach eliminates the need for stiffener discretization and the localization of FGM plate elements at stiffener nodes. Initially, the convergence and accuracy of the present method are verified by the bending of an unstiffened FGM plate and free vibration of a stiffened FGM plate, respectively. Subsequently, the static bending behaviors of FGM plates are investigated by uniform and nonuniform loads, diverse gradient indices, and variable plate thicknesses. Furthermore, a thorough investigation is conducted on the free vibration of rectangular, skew, and circular FGM plates, considering the cutouts and stiffeners under various boundary conditions. The corresponding results of our method coincide with available data in literature.</div></div>","PeriodicalId":50626,"journal":{"name":"Computers & Structures","volume":"310 ","pages":"Article 107677"},"PeriodicalIF":4.4,"publicationDate":"2025-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143454267","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Multiscale characterization of the mechanics of curved fibered structures with application to biological and engineered materials

IF 4.4 2区工程技术

Computers & Structures Pub Date : 2025-02-21 DOI: 10.1016/j.compstruc.2025.107690

J.A. Sanz-Herrera, A. Apolinar-Fernandez, A. Jimenez-Aires, P. Perez-Alcantara, J. Dominguez, E. Reina-Romo

{"title":"Multiscale characterization of the mechanics of curved fibered structures with application to biological and engineered materials","authors":"J.A. Sanz-Herrera, A. Apolinar-Fernandez, A. Jimenez-Aires, P. Perez-Alcantara, J. Dominguez, E. Reina-Romo","doi":"10.1016/j.compstruc.2025.107690","DOIUrl":"10.1016/j.compstruc.2025.107690","url":null,"abstract":"<div><div>Curved fibered structures are ubiquitous in nature and the mechanical behavior of these materials is of pivotal importance in the biomechanics and mechanobiology fields. We develop a multiscale formulation to characterize the macroscopic mechanical nonlinear behavior from the microstructure of fibered matrices. From the analysis of the mechanics of a randomly curved single fiber, a fibered matrix model is built to determine the macroscopic behavior following a homogenization approach. The model is tested for tensile, compression and shear loads in different applications. The presented approach naturally recovers instabilities at compression as well as the strain stiffening regime, which are observed experimentally in the mechanical behavior of collagen matrices. Indeed, it was found that the bending energy associated to fiber unrolling, is the most important source of energy developed by fibers for the analyzed cases in tensile and shear in all deformation regions (except the strain stiffening region), whereas bending energy dominates at compression too during buckling. The proposed computational framework can also be used to perform multiscale simulations in engineered fibered materials. Therefore, the developed methodology may be an interesting and complementary tool to characterize the nonlinear behavior and evolution of curved fibered structures present in biology and engineering.</div></div>","PeriodicalId":50626,"journal":{"name":"Computers & Structures","volume":"310 ","pages":"Article 107690"},"PeriodicalIF":4.4,"publicationDate":"2025-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143454266","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Fast band structure prediction for phononic crystals with double−stage model reduction and wave isogeometric analysis

IF 4.4 2区工程技术

Computers & Structures Pub Date : 2025-02-20 DOI: 10.1016/j.compstruc.2025.107694

Zhen Lei , Tengfei Liu

{"title":"Fast band structure prediction for phononic crystals with double−stage model reduction and wave isogeometric analysis","authors":"Zhen Lei , Tengfei Liu","doi":"10.1016/j.compstruc.2025.107694","DOIUrl":"10.1016/j.compstruc.2025.107694","url":null,"abstract":"<div><div>Phononic crystals (PnCs), a well−known group of artificial metamaterials that demonstrate bandgap characteristics, are commonly utilized in multiple engineering fields. However, its design often faces the computational challenge of iterative band structure calculations, retarding the invention of new PnCs. In order to speed up the computation of band structures, this paper introduces a novel numerical method called double−stage reduced wave isogeometric analysis (DRWIGA). Isogeometric analysis is adopted to precisely describe the cell's geometry during modeling and analysis. The reduced−order model is obtained from a single cell undergoing a two−step reduction process: inner mode and boundary mode reduction. This significantly reduces the dimension of the problem, thereby expediting the calculation of band structures. The proposed method's efficiency and effectiveness are demonstrated by classic benchmark problems. This approach achieves a 94% decrease in model size for 2D PnCs, along with an impressive 99.7% reduction in CPU time for slowness surface calculations. It accelerates the bandgap optimization of PnCs and fosters novel metamaterial designs.</div></div>","PeriodicalId":50626,"journal":{"name":"Computers & Structures","volume":"310 ","pages":"Article 107694"},"PeriodicalIF":4.4,"publicationDate":"2025-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143445531","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A deep learning-based method for full-bridge flutter analysis considering aerodynamic and geometric nonlinearities

IF 4.4 2区工程技术

Computers & Structures Pub Date : 2025-02-19 DOI: 10.1016/j.compstruc.2025.107693

Wen-ming Zhang , Dan-dian Feng , Li-ming Zhao , Yao-jun Ge

{"title":"A deep learning-based method for full-bridge flutter analysis considering aerodynamic and geometric nonlinearities","authors":"Wen-ming Zhang , Dan-dian Feng , Li-ming Zhao , Yao-jun Ge","doi":"10.1016/j.compstruc.2025.107693","DOIUrl":"10.1016/j.compstruc.2025.107693","url":null,"abstract":"<div><div>The nonlinearity effect grows with the span length of the bridge. Traditional linear flutter analysis methods are gradually unable to meet research and design needs. This study proposed a time-domain nonlinear method for the 3D full-bridge flutter analysis based on deep learning. It considered multiple effects including aerostatic effect, as well as aerodynamic and geometric nonlinearities of the structure. Firstly, a nonlinear reduced-order aerodynamic model was constructed for the bridge deck section based on the long short-term memory (LSTM) network. The section displacement was the input, and the aerodynamic force was the output. The aerodynamic data were obtained from CFD numerical simulation of forced vibration. Next, the 3D full-bridge flutter analysis framework was constructed. The aerodynamic forces predicted by the reduced-order model were imposed as concentrated forces on the deck nodes of bridge finite element model. The restart technique was implemented to achieve the dynamic iterative calculation. The influence of the initial excitation caused by the static wind effect on the vibration mode was eliminated by changing Rayleigh damping to make the bridge reaches the static wind equilibrium state in advance. Finally, a case study on a triple-tower suspension bridge was performed. The nonlinear flutter phenomenon observed in the full-bridge model wind tunnel test was reproduced using the proposed method. The influence of geometric nonlinearity on the flutter phenomenon was analyzed. This study provides an important reference for accurately evaluating the nonlinear flutter performance of bridges and further improving their anti-wind performance.</div></div>","PeriodicalId":50626,"journal":{"name":"Computers & Structures","volume":"310 ","pages":"Article 107693"},"PeriodicalIF":4.4,"publicationDate":"2025-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143436862","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A CFD-FEM-IBM simulation scheme for the strong coupling between the fluid and the structure with large deformations and movements

IF 4.4 2区工程技术

Computers & Structures Pub Date : 2025-02-18 DOI: 10.1016/j.compstruc.2025.107673

Jia Mao , Feng Li , Shuhe Wang , Lanhao Zhao , Yingtang Di

{"title":"A CFD-FEM-IBM simulation scheme for the strong coupling between the fluid and the structure with large deformations and movements","authors":"Jia Mao , Feng Li , Shuhe Wang , Lanhao Zhao , Yingtang Di","doi":"10.1016/j.compstruc.2025.107673","DOIUrl":"10.1016/j.compstruc.2025.107673","url":null,"abstract":"<div><div>To describe the strong coupling between the fluid and the elastic structure with drastic deformations and large movements, a CFD-FEM-IBM simulation scheme is proposed. The fluid dynamics are governed by the Navier-Stokes equations, while the highly nonlinear mechanical behavior of the deformable structure is simulated using the updated Lagrangian incremental description. An outstanding feature of the hybrid method is that both the computational fluid dynamics and the computational solid dynamics are discretized spatially in the finite element framework. Besides, the main challenge in simulating strong coupling effects accurately lies in describing the fluid–structure boundary which deforms drastically over time. The direct-forcing immersed boundary method is employed to tackle the fluid–structure interaction and immersed boundary points allocated on the deformable surface of the structure are used to represent the fluid–structure interface. Both the no-slip boundary condition and the divergence-free condition for the IBM are ensured thorough several iterations. Moreover, the partitioned approach is utilized to solve the coupling system and iterations are carried out at each time step to reflect strong coupling effects. The reliability and accuracy of the current method in simulating the fluid–structure interaction problems with large deformations and movements are finally validated by benchmark tests.</div></div>","PeriodicalId":50626,"journal":{"name":"Computers & Structures","volume":"310 ","pages":"Article 107673"},"PeriodicalIF":4.4,"publicationDate":"2025-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143427803","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

An indirect harmonic balance method based on frequency response functions simplification for periodical response analysis of local nonlinearity systems

IF 4.4 2区工程技术

Computers & Structures Pub Date : 2025-02-18 DOI: 10.1016/j.compstruc.2025.107663

Ning Chen , Shuqian Cao , Yuanhang Hou

{"title":"An indirect harmonic balance method based on frequency response functions simplification for periodical response analysis of local nonlinearity systems","authors":"Ning Chen , Shuqian Cao , Yuanhang Hou","doi":"10.1016/j.compstruc.2025.107663","DOIUrl":"10.1016/j.compstruc.2025.107663","url":null,"abstract":"<div><div>The majority of the nonlinear factors introduced into engineering tend to exhibit locality rather than globality. This paper proposed a novel indirect-HBM (indirect Harmonic Balance Method) based on the perspective of local nonlinearity. The excellent performance of this method stems from its HE (Harmonic Equation). The indirect-HE (HEs of the Indirect-HBM) were composed of the FRF (Frequency Response Function) directly and it can be subdivided into Key-HEs and Aug-HEs (Augmented HE). Here, the Key-HE serves efficient computation, while Aug-HE meets various engineering needs. In this research, a FEM(Finite Element Medel) with one cube nonlinear and an infinite dimension rotor system with gap nonlinearity was employed to investigate the computational performance. First, the accuracy of indirect-HBM was verified by the numerical solution based on the 32-DOF FEM. Then, compared with the classical HBM, its computational efficiency can not be constrained by DOFs. Finally, It was applied in an infinite-dimension nonlinear rotor system, which implemented a solution based on PDE rather than ODE. The numerical solutions based on different FEMs prove that the indirect-HBM has the fidelity of the dynamic model. From the perspective of local nonlinearity, the indirect-HBM offers a novel solution approach and excellent computational performance.</div></div>","PeriodicalId":50626,"journal":{"name":"Computers & Structures","volume":"310 ","pages":"Article 107663"},"PeriodicalIF":4.4,"publicationDate":"2025-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143436861","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0