Journal of Sound and Vibration最新文献_第3页

Sound sources in turbulent hydrogen/methane premixed jet flames 湍流氢/甲烷预混射流火焰中的声源

IF 4.9 2区工程技术

Journal of Sound and Vibration Pub Date : 2025-09-10 DOI: 10.1016/j.jsv.2025.119407

Jen Zen Ho , Mohsen Talei

{"title":"Sound sources in turbulent hydrogen/methane premixed jet flames","authors":"Jen Zen Ho , Mohsen Talei","doi":"10.1016/j.jsv.2025.119407","DOIUrl":"10.1016/j.jsv.2025.119407","url":null,"abstract":"<div><div>Sound generation by hydrogen/methane premixed flames is examined using a Direct Numerical Simulation (DNS) dataset of three jet premixed flames at a Reynolds number of 10,300, with 10%, 50%, and 80% hydrogen by volume. Dowling’s reformulation of Lighthill’s acoustic analogy is also used to evaluate the contributions of different sound sources.</div><div>Hydrogen addition increases high-frequency sound, particularly at Strouhal numbers greater than two where flame annihilation events are strong noise sources. Our analysis of Dowling’s source terms reveals that the dominant contributors to the generated sound are the Lighthill’s stress tensor, the time derivative of the heat release rate, the momentum changes of density inhomogeneity, and boundary noise. The energy transport by mass diffusion also plays a role in the 50% hydrogen case. A strong coupling is observed between the Lighthill’s stress tensor and the momentum changes of density inhomogeneity. Further analysis shows that their combined effect can be approximated by the conventional turbulence-generated noise source term used in non-reacting jets, i.e. <span><math><mrow><mi>ρ</mi><msup><mrow><mi>∂</mi></mrow><mrow><mn>2</mn></mrow></msup><msub><mrow><mi>u</mi></mrow><mrow><mi>i</mi></mrow></msub><msub><mrow><mi>u</mi></mrow><mrow><mi>j</mi></mrow></msub><mo>/</mo><mi>∂</mi><msub><mrow><mi>x</mi></mrow><mrow><mi>i</mi></mrow></msub><mi>∂</mi><msub><mrow><mi>x</mi></mrow><mrow><mi>j</mi></mrow></msub></mrow></math></span>. Examination of the swirl strength field suggests that turbulent eddies outside the flame primarily contribute to this source term.</div><div>Our results suggest that at high Reynolds numbers relevant to practical applications, the contributions of boundary noise and turbulence-generated noise, as well as the time derivative of the heat release rate, should be all considered to fully explain sound generation by premixed flames.</div></div>","PeriodicalId":17233,"journal":{"name":"Journal of Sound and Vibration","volume":"620 ","pages":"Article 119407"},"PeriodicalIF":4.9,"publicationDate":"2025-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145097078","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

High frequency vibration analysis of beams on elastic foundation by a developed energy finite element method 弹性基础梁高频振动的能量有限元分析

IF 4.9 2区工程技术

Journal of Sound and Vibration Pub Date : 2025-09-10 DOI: 10.1016/j.jsv.2025.119454

Chenxi Xiong, Chi Xu, Amin Farrokhabadi, Christos Spitas, Jian Yang

{"title":"High frequency vibration analysis of beams on elastic foundation by a developed energy finite element method","authors":"Chenxi Xiong, Chi Xu, Amin Farrokhabadi, Christos Spitas, Jian Yang","doi":"10.1016/j.jsv.2025.119454","DOIUrl":"10.1016/j.jsv.2025.119454","url":null,"abstract":"<div><div>This paper develops an Energy Finite Element (EFE) model for analysing the high-frequency vibration of beams on elastic foundations. By introducing the potential energy density and energy intensity associated with the foundation reaction, the energy transmission and dissipation equations are derived. In addition, the point impedance at the excitation point of the beam on an elastic foundation is derived to calculate the input power. Both the Winkler and the Pasternak foundation models are considered. Combined with the energy transmission and dissipation equations and the input power, the governing equation for energy density is established. Based on this, an EFE model is constructed to predict the response of the beam on elastic foundation in the high-frequency range. The proposed model is validated by comparison with exact analytical solutions, demonstrating its effectiveness in predicting high-frequency responses. Finally, the influence of the elastic foundation on wave propagation characteristics, energy distribution, and total energy of the beam under high-frequency excitation is discussed. The results demonstrate that the elastic foundation has a significant impact on wave propagation, and the vibration energy of the beam. Both the foundation's normal stiffness and the shear stiffness have significant influence on the high-frequency vibration of the beam. It is shown that at 2000 Hz, changes of the foundation stiffness and shear stiffness in reasonable ranges can lead to up to 60 % and 40 % variations on the total energy of the beam. It is demonstrated that vibration energy in the structure can be effectively controlled by adjusting the elastic foundation properties.</div></div>","PeriodicalId":17233,"journal":{"name":"Journal of Sound and Vibration","volume":"620 ","pages":"Article 119454"},"PeriodicalIF":4.9,"publicationDate":"2025-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145097148","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 novel contact dynamics modeling method for profile-shifted spur gear pairs considering geometric eccentricity 考虑几何偏心的插齿直齿副接触动力学建模新方法

IF 4.9 2区工程技术

Journal of Sound and Vibration Pub Date : 2025-09-09 DOI: 10.1016/j.jsv.2025.119453

Yuankui Luo , Lixin Xu , Ruhao Hu , Feng Zhou

{"title":"A novel contact dynamics modeling method for profile-shifted spur gear pairs considering geometric eccentricity","authors":"Yuankui Luo , Lixin Xu , Ruhao Hu , Feng Zhou","doi":"10.1016/j.jsv.2025.119453","DOIUrl":"10.1016/j.jsv.2025.119453","url":null,"abstract":"<div><div>The profile shift coefficient, as an active design parameter, optimizes transmission performance by adjusting the meshing point displacement, while geometric eccentricity arises from manufacturing or assembly errors, causing meshing center distance deviation. These two factors respectively characterize active modification and passive deviation in gear systems, jointly influencing dynamic characteristics. Focusing on a pair of profile-shifted spur gears considering geometric eccentricity, a contact dynamics modeling method is adopted to investigate their vibration characteristics. The contact dynamics model for profile-shifted spur gear pairs with geometric eccentricity comprises five core components: tooth profile mathematical model, time-varying meshing stiffness (TVMS) model, dynamic differential equations, contact model, and unknown variable solving model. Based on the proposed model, the study analyzes the effects of different profile shift coefficients, geometric eccentricity values, and their coupled interactions on the dynamic response of the gear system. It reveals the regulatory role of profile shift coefficients in eccentricity sensitivity. By constructing a dynamic simulation model for profile-shifted spur gear pairs with geometric eccentricity, the accuracy of the proposed model is validated. This research provides theoretical foundations for profile-eccentricity collaborative optimization in high-precision gear systems, particularly applicable to dynamically sensitive transmission devices such as aerospace reducers and precision machine tools.</div></div>","PeriodicalId":17233,"journal":{"name":"Journal of Sound and Vibration","volume":"620 ","pages":"Article 119453"},"PeriodicalIF":4.9,"publicationDate":"2025-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145061260","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

Active disturbance rejection control with phase plane trajectory planning for overhead cranes 桥式起重机相位平面轨迹规划自抗扰控制

IF 4.9 2区工程技术

Journal of Sound and Vibration Pub Date : 2025-09-09 DOI: 10.1016/j.jsv.2025.119451

Wenbo Huang , Baochun Lu , Chaoyang Weng , Wangqiang Niu

引用次数: 0

Controlling dynamics of an SMA structure with thermomechanical couplings using time-delayed feedback control method 采用时滞反馈控制方法控制具有热力耦合的SMA结构动力学

IF 4.9 2区工程技术

Journal of Sound and Vibration Pub Date : 2025-09-08 DOI: 10.1016/j.jsv.2025.119435

Dimitri Costa , Aline de Paula , Davide Bernardini , Giuseppe Rega , Marcelo A. Savi , Ekaterina Pavlovskaia

{"title":"Controlling dynamics of an SMA structure with thermomechanical couplings using time-delayed feedback control method","authors":"Dimitri Costa , Aline de Paula , Davide Bernardini , Giuseppe Rega , Marcelo A. Savi , Ekaterina Pavlovskaia","doi":"10.1016/j.jsv.2025.119435","DOIUrl":"10.1016/j.jsv.2025.119435","url":null,"abstract":"<div><div>Morphing structures which are currently employed in different applications typically suffer from slow actuation rates for most of the built in actuators. Shape memory alloy elements are commonly used as actuators due to their ability to produce large forces and displacements. A common practice when dealing with shape memory alloys actuation in smart structures is to perform quasi-static analyses to evaluate morphing capabilities, neglecting temperature dynamics and its constraints on the actuation. This oversight becomes critical when dynamical forces can perturb the structure from its intended configuration. In these scenarios, the application of nonlinear control methods, such as the extended time-delayed feedback control, and the dynamical analysis of SMA behaviour can ensure the stability of a desired configuration or be used to rapidly change configurations. This work investigates stabilization of unstable periodic orbits exhibited by a shape memory alloy two-bar truss system. The considered thermomechanical model describes the internal hysteresis and energy dissipation due to phase transformations. The heat transfer constraints on actuation and the effectiveness of the control in stabilizing unstable periodic orbits are evaluated. Results show that the extended time-delayed feedback method can successfully stabilize a target orbit in a range of convective heat dissipation coefficients and reveal the mechanisms that prevent the controller to succeed outside that region. In addition the constrained thermal actuation demonstrates that heat dissipation limits the maximum stability that can be achieved by the controller.</div></div>","PeriodicalId":17233,"journal":{"name":"Journal of Sound and Vibration","volume":"620 ","pages":"Article 119435"},"PeriodicalIF":4.9,"publicationDate":"2025-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145097077","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

Nonlinear dynamics of an axially preloaded hinged–hinged planar beam — Experimental insights, finite element modal analysis and analytical modeling 轴向预加载铰接-铰接平面梁的非线性动力学——实验见解、有限元模态分析和解析建模

IF 4.9 2区工程技术

Journal of Sound and Vibration Pub Date : 2025-09-08 DOI: 10.1016/j.jsv.2025.119434

Jaroslaw Latalski, Lukasz Kloda, Joanna Dubicka-Nowak

{"title":"Nonlinear dynamics of an axially preloaded hinged–hinged planar beam — Experimental insights, finite element modal analysis and analytical modeling","authors":"Jaroslaw Latalski, Lukasz Kloda, Joanna Dubicka-Nowak","doi":"10.1016/j.jsv.2025.119434","DOIUrl":"10.1016/j.jsv.2025.119434","url":null,"abstract":"<div><div>The dynamic response of a composite beam with hinged boundary conditions and an adjustable span is investigated. Prestress applied via uniform axial stretching alters the natural frequencies across all vibration modes and governs the nonlinear response, including both hardening and softening effects. In certain cases, these effects influence transmissibility (mixed hardening/softening behavior). Uniform axial shortening leads to a pitchfork bifurcation and the emergence of two post-critical configurations. In the experimental part of the study, controlled axial shortening with a prescribed half-wave amplitude ratio was applied to address the extreme sensitivity of longitudinal displacement. The system was then subjected to base excitation, accounting for both in-well and cross-well dynamics. For the first buckling mode, significant changes of the first natural frequency within the linear range were observed, while the other frequencies remained largely unaffected. The experimental findings are followed by analytical studies. In the mathematical formulation, a coupled longitudinal–transverse nonlinear model of an unshearable beam is proposed, retaining nonlinearities up to the fifth order. Additionally, effects related to mid-line extensibility and hinge inertia are included. A system of two partial differential equations governing axial and transverse displacements is derived and subsequently discretized using the Galerkin procedure. The simplified case without the axial load is solved numerically, and frequency response diagrams for individual modal coordinates are plotted accounting for various base excitation amplitudes.</div></div>","PeriodicalId":17233,"journal":{"name":"Journal of Sound and Vibration","volume":"620 ","pages":"Article 119434"},"PeriodicalIF":4.9,"publicationDate":"2025-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145097149","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

Rigid-elastic-coupled aeroservoelastic modeling and flight test verification of a flexible flying-wing aircraft 柔性飞翼飞行器刚-弹耦合气动伺服弹性建模与试飞验证

IF 4.9 2区工程技术

Journal of Sound and Vibration Pub Date : 2025-09-06 DOI: 10.1016/j.jsv.2025.119440

Xusheng Mu, Rui Huang, Qitong Zou, Xinghua Zhou, Haojie Liu, Haiyan Hu

{"title":"Rigid-elastic-coupled aeroservoelastic modeling and flight test verification of a flexible flying-wing aircraft","authors":"Xusheng Mu, Rui Huang, Qitong Zou, Xinghua Zhou, Haojie Liu, Haiyan Hu","doi":"10.1016/j.jsv.2025.119440","DOIUrl":"10.1016/j.jsv.2025.119440","url":null,"abstract":"<div><div>This paper presents a novel approach of aeroservoelastic modeling coupled with flight dynamics for a flexible flying-wing aircraft in a body frame of reference. The modeling approach fully encompasses the dynamic coupling among the aircraft rigid-body motions, elastic vibrations and control-surface deflections. The coupled dynamic equations derived are in terms of the quasi-coordinates of a set of Lagrange equations, the nodal coordinates of a finite-element model for the aircraft and the aerodynamic variables based on aerodynamic derivative matrices. The attractive feature of the modeling approach is that it maintains complete consistency with classical flight dynamics formulations and is compatible with the finite-element model of high-fidelity. To validate the present modeling approach, the paper provides the body-freedom flutter computations of a flexible flying-wing aircraft via the present modeling method and corresponding flight tests. The numerical computations show small relative errors in the airspeed and frequency of body-freedom flutter, as well as closely matching flutter configurations compared to the flight tests.</div></div>","PeriodicalId":17233,"journal":{"name":"Journal of Sound and Vibration","volume":"621 ","pages":"Article 119440"},"PeriodicalIF":4.9,"publicationDate":"2025-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145155642","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-tortuous acoustic materials 多弯曲声学材料

IF 4.9 2区工程技术

Journal of Sound and Vibration Pub Date : 2025-09-04 DOI: 10.1016/j.jsv.2025.119433

Tomasz G. Zieliński , Marie-Annick Galland

{"title":"Multi-tortuous acoustic materials","authors":"Tomasz G. Zieliński , Marie-Annick Galland","doi":"10.1016/j.jsv.2025.119433","DOIUrl":"10.1016/j.jsv.2025.119433","url":null,"abstract":"<div><div>In this work, a multi-pressure equivalent fluid (MPEF) approach is applied to model non-conventional acoustic materials that combine different, separate pore networks with contrasting tortuosities. A technique for the informed design of such <em>multi-tortuous</em> materials is proposed. It is based on the observation that broadband performance of such a material can be achieved by tuning the quarter-wavelength resonances corresponding to each network. The material design consists therefore in adding and tailoring the separate pore networks to obtain contrasting tortuosities that evenly distribute these resonances over the desired frequency range. Additional improvement is achieved by independent isotropic scaling of the separate networks. The proposed technique is accurate and also very efficient because it is based on semi-analytical calculations. All this is demonstrated on several examples of multi-tortuous materials which, for simplicity, have an essentially two-dimensional structure. The results obtained in the material design process are verified by Navier–Stokes direct numerical simulations as well as by the MPEF numerical model. Final validation was also carried out experimentally on an additively manufactured sample of one of the multi-tortuous materials designed for this study. The multi-resonance phenomenon observed in sound absorption as well as the experimentally demonstrated anomalous behaviour of the multi-tortuous material backed by an air gap are very well predicted by the modelling and explained in detail on physical grounds.</div></div>","PeriodicalId":17233,"journal":{"name":"Journal of Sound and Vibration","volume":"621 ","pages":"Article 119433"},"PeriodicalIF":4.9,"publicationDate":"2025-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145020739","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 robust phase-based vibration perception pipeline using general curvelet transform and adaptive data fusion strategy 基于通用曲线变换和自适应数据融合策略的鲁棒相位振动感知管道

IF 4.9 2区工程技术

Journal of Sound and Vibration Pub Date : 2025-09-04 DOI: 10.1016/j.jsv.2025.119438

Wendi Zhang, Jiwen Zhou, Yun Li, Guang Meng, Hongguang Li

{"title":"A robust phase-based vibration perception pipeline using general curvelet transform and adaptive data fusion strategy","authors":"Wendi Zhang, Jiwen Zhou, Yun Li, Guang Meng, Hongguang Li","doi":"10.1016/j.jsv.2025.119438","DOIUrl":"10.1016/j.jsv.2025.119438","url":null,"abstract":"<div><div>Vision-based measurement techniques have attracted widespread interest across engineering fields. Phase-based motion estimation has been widely used due to its sub-pixel precision and high-resolution sensing capabilities. However, noise introduced during different calculation processes, such as image noise, gradient calculation noise, and unstable phase interference, can compromise the accuracy of local phase extraction and subsequent vibration displacement estimation. Addressing these noise-related challenges with a single approach remains difficult. In this study, a structural vibration perception pipeline based on phase-based motion estimation is designed to improve the accuracy and robustness of motion estimation under various types of noise environments. Specifically, multiscale local phases are extracted using the general curvelet transform, which provides near-optimal sparse representations. Multiscale local amplitudes are integrated into an adaptive data fusion strategy that eliminates phase-unstable scales through self-evaluation indices, thereby avoiding reliance on fixed thresholds. Meanwhile, the spatial frequency map, used as another input for data fusion, is estimated via a double filtering approach followed by the O’Shea refinement algorithm to reduce noise in the estimated values. To demonstrate proof-of-principle, a numerically simulated two-dimensional complex-valued image and two-motion simulated videos with varying image noise were performed. It demonstrated that the proposed method outperformed several existing algorithms in terms of vibration estimation accuracy. Validation experiments were conducted on both rigid and flexible structures, with comparisons of estimated displacements confirming the superior accuracy and robustness.</div></div>","PeriodicalId":17233,"journal":{"name":"Journal of Sound and Vibration","volume":"620 ","pages":"Article 119438"},"PeriodicalIF":4.9,"publicationDate":"2025-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145047696","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

Arcuate loudspeaker array for enhanced diffuse acoustic field synthesis: A comparative study with linear arrays 用于增强漫射声场合成的弧形扬声器阵列：与线性阵列的比较研究

IF 4.9 2区工程技术

Journal of Sound and Vibration Pub Date : 2025-09-02 DOI: 10.1016/j.jsv.2025.119437

Haosheng Liu , Bilong Liu , Fengyan An , Andrew Peplow

{"title":"Arcuate loudspeaker array for enhanced diffuse acoustic field synthesis: A comparative study with linear arrays","authors":"Haosheng Liu , Bilong Liu , Fengyan An , Andrew Peplow","doi":"10.1016/j.jsv.2025.119437","DOIUrl":"10.1016/j.jsv.2025.119437","url":null,"abstract":"<div><div>Diffuse acoustic fields are widely employed for material testing in industry, and loudspeaker‐array synthesis offers high accuracy and flexible control. However, prior work has focused primarily on linear or planar arrays, with little attention to curved geometries. In this study, we introduce an arcuate loudspeaker array for diffuse acoustic field synthesis and compare its performance to that of a one‐dimensional linear array across three metrics: synthesis accuracy, transfer‐matrix condition number, and energy concentration within a prescribed sector. Loudspeaker directivity is modeled as frequency‐dependent: at low frequencies each unit behaves as an ideal monopole (omnidirectional), while at mid frequencies an acoustic‐center‐compensated source model captures weak directivity. To explain the observed differences, we analyze wavefront matching via Huygens’ principle and spectral concentration through spatial wavenumber decomposition. Numerical simulations demonstrate that the arcuate array outperforms the linear array in mid‐to‐high frequency bands, achieving both lower synthesis error and higher sector energy concentration. These findings are validated experimentally in an anechoic chamber using eight‐unit linear and arcuate arrays. Our results show that a curved array geometry more effectively focuses diffuse energy into the target region, reducing leakage and enabling high‐precision field synthesis.</div></div>","PeriodicalId":17233,"journal":{"name":"Journal of Sound and Vibration","volume":"619 ","pages":"Article 119437"},"PeriodicalIF":4.9,"publicationDate":"2025-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145009872","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