Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture最新文献_第8页

A framework for practically effective creation of postprocessors for 5-axis CNC machines with all possible configurations and working mechanisms 为具有所有可能配置和工作机制的五轴数控机床实际有效创建后处理器的框架

IF 2.6 3区工程技术

Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture Pub Date : 2023-06-10 DOI: 10.1177/09544054231179314

A. M. Chu, Minh Thai Le, Ngoc Ha Hoang, C. Le, Uyi-Osa Egbe, James Gao, N. Zlatov, M. Packianather

{"title":"A framework for practically effective creation of postprocessors for 5-axis CNC machines with all possible configurations and working mechanisms","authors":"A. M. Chu, Minh Thai Le, Ngoc Ha Hoang, C. Le, Uyi-Osa Egbe, James Gao, N. Zlatov, M. Packianather","doi":"10.1177/09544054231179314","DOIUrl":"https://doi.org/10.1177/09544054231179314","url":null,"abstract":"The 5-axis CNC (Computer Numerical Control) machining plays an important role in manufacturing, especially in making parts of complex shapes such as turbine or propeller blades. However, there are always challenges of generating 5-axis CNC machining programs when working with different 5-axis CNC machines of various structures; and 5-axis CNC programs must be automatically generated by CNC postprocessors which calculate the inverse kinematics and convert the Cutter Location data to the CNC programs that are used for operating 5-axis CNC machines. Since the family of 5-axis CNC machines has a wide spectrum of machine configurations, with hundreds of mechanisms of 5 degrees of freedom, it is therefore practically challenging for engineers and CNC machine operators to create CNC postprocessors for specific 5-axis CNC machines. It is more challenging to create CNC postprocessors if engineers or CNC operators do not have strong backgrounds and professional skills in mathematical modeling and kinematics of machines. This paper presents a universal and intuitive framework and practical guidance to create CNC postprocessors for all 5-axis CNC machines, with the focus on a novel mathematical formulation of inverse kinematics of three main groups of 5-axis CNC machines. The case studies of creating CNC postprocessors with the commercially available 5-axis CNC machines were successfully demonstrated, in which the simulation scenarios and experiments were implemented to verify the created CNC postprocessors. The proposed frameworks and guides for generating CNC postprocessors can be conveniently and effectively applied in industrial practices, without the required strong backgrounds and skills for engineers or CNC operators in mathematical modeling and kinematics of machines, especially mathematical modeling of multibody systems.","PeriodicalId":20663,"journal":{"name":"Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture","volume":"20 1","pages":""},"PeriodicalIF":2.6,"publicationDate":"2023-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78965448","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Effect of tool flank wear on formation and prediction of tool flank rolling angle using finite element method 刀面磨损对刀面滚动角形成及有限元预测的影响

IF 2.6 3区工程技术

Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture Pub Date : 2023-06-10 DOI: 10.1177/09544054231178974

Ziqi Zhang, Zhanqiang Liu, Xiaoping Ren

{"title":"Effect of tool flank wear on formation and prediction of tool flank rolling angle using finite element method","authors":"Ziqi Zhang, Zhanqiang Liu, Xiaoping Ren","doi":"10.1177/09544054231178974","DOIUrl":"https://doi.org/10.1177/09544054231178974","url":null,"abstract":"The formation and determination of the tool flank rolling angle are discussed in this study. First, the relationship between the tool flank rolling angle and the distribution of the tool wear rate on the tool-flank worn zone is developed by combining the finite element (FE) method and a turning experiment, and the determination method of the tool flank rolling angle using the FE simulation is revealed. Then, the evolution of the tool flank rolling angle with the tool flank wear progress is analyzed, and the evolution of the tool flank rolling angle is also considered in the determination of constants in the Usui model for tool flank wear. Finally, the empirical model of the tool flank rolling angle based on the tool flank wear width VB is proposed based on the FE method. The empirical model results are found to be in good agreement with the experimental results. The evolution of the tool flank rolling angle is considered in tool wear prediction. Compared with the method with a constant tool flank rolling angle, the tool wear prediction accuracy of our model is improved.","PeriodicalId":20663,"journal":{"name":"Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture","volume":"64 1","pages":""},"PeriodicalIF":2.6,"publicationDate":"2023-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81445288","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Study of electrical pulse heat assisted cutting of titanium alloy TC21 based on the finite element method 基于有限元法的TC21钛合金电脉冲热辅助切削研究

IF 2.6 3区工程技术

Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture Pub Date : 2023-06-08 DOI: 10.1177/09544054231179525

Chunsong Ke, X. Qian, Lei Zhang

{"title":"Study of electrical pulse heat assisted cutting of titanium alloy TC21 based on the finite element method","authors":"Chunsong Ke, X. Qian, Lei Zhang","doi":"10.1177/09544054231179525","DOIUrl":"https://doi.org/10.1177/09544054231179525","url":null,"abstract":"Titanium alloys are widely used in various fields because of their high strength, excellent corrosion resistance, and high heat resistance. As a new advanced titanium alloy for aviation, TC21 titanium alloy has high strength and poor machinability. It is of great significance to study the cutting mechanism of this alloy and the methods to improve the machinability of aircraft. In this paper, aiming at the difficult machinability of titanium alloy TC21, EPH online heating assisted cutting method is put forward for the first time. During the cutting experiment, the TC21 alloy sample was heated to a variety of temperatures through the electric pulse thermal heat technique. Chip shape and cutting force under different heating temperatures were obtained by cutting experiments. In order to study the influence of the heat-assisted cutting process on the machining of TC21 alloy, the orthogonal finite element model was proposed to simulate the heat-assisted cutting process of TC21 alloy. Through this simulation, chip formation, cutting force, and cutting temperature variation were all obtained. The chip formed by the simulation was in accordance with the actual chip. The results demonstrate that the influence of heat-assisted machining on chip morphology of titanium alloy is relatively small, but it has a significant influence on cutting force and surface roughness. The results show that when the sample is heated to 600°C, the surface quality is the best and cutting force can be reduced by more than 40%.","PeriodicalId":20663,"journal":{"name":"Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture","volume":"1 1","pages":""},"PeriodicalIF":2.6,"publicationDate":"2023-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77123837","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

The role of roughness parameters in grading the machined surface quality in Ti-alloys 粗糙度参数在钛合金加工表面质量分级中的作用

IF 2.6 3区工程技术

Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture Pub Date : 2023-06-08 DOI: 10.1177/09544054231179249

S. Carvalho, A. Horovistiz, J. Davim

{"title":"The role of roughness parameters in grading the machined surface quality in Ti-alloys","authors":"S. Carvalho, A. Horovistiz, J. Davim","doi":"10.1177/09544054231179249","DOIUrl":"https://doi.org/10.1177/09544054231179249","url":null,"abstract":"Titanium alloys are extensively employed in machining to produce high-value components, where surface roughness is crucial for their functionality. In this study, the roughness of Ti6Al4V and Ti6Al7Nb turned surfaces was analysed. The goal was to compare the alloy’s roughness behaviour when machined under the same conditions. Therefore, hypothesis testing was performed to assess the equality of the expected values and population median. It was found that, for some parameters, the mean ( RzI, Rt) and median ( Rq, RzD, Pt) roughness was statistically different when changing alloys. However, for others, it did not present a significant difference, in terms of mean ( RmD, Rp) and median ( Ra, Rpm). Consequently, a relevant insight from this study was that the phenomenon interpretation was affected by roughness parameter selection. On the other hand, as expected, the feed rate played a critical role in roughness control. It was observed that Ti6Al7Nb had a smoother topography ( Ra was 0.15 ± 0.01 μm and 0.62 ± 0.04 μm) than Ti6Al4V (0.31 ± 0.02 μm and 0.67 ± 0.03 μm) at 0.05 and 0.15 mm/rev. Yet, at 0.1 mm/rev, this behaviour changed, as Ti6Al4V had a smoother surface ( Ra was 0.40 ± 0.02 μm) than Ti6Al7Nb ( Ra was 0.51 ± 0.03 μm). Finally, the multi-optimization indicated that a low feed rate (0.05 mm/rev) and medium (60 m/min) and high (90 m/min) cutting speed led to lower roughness and higher material removal rate for turning Ti6Al7Nb and Ti6Al7V, respectively. The insights from this study may have a practical application in the manufacturing and quality control of biomedical components.","PeriodicalId":20663,"journal":{"name":"Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture","volume":"5 1","pages":""},"PeriodicalIF":2.6,"publicationDate":"2023-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88748580","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Investigation on high-shear and low-pressure grinding with CBN liquid-body-armor-like wheel for Inconel718 CBN液体-体甲样砂轮磨削Inconel718的高剪低压研究

IF 2.6 3区工程技术

Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture Pub Date : 2023-06-08 DOI: 10.1177/09544054231178978

Bing Liu, Yebing Tian, Jinguo Han, Jinling Wang, Guoyu Zhang, Zhiqiang Gu

{"title":"Investigation on high-shear and low-pressure grinding with CBN liquid-body-armor-like wheel for Inconel718","authors":"Bing Liu, Yebing Tian, Jinguo Han, Jinling Wang, Guoyu Zhang, Zhiqiang Gu","doi":"10.1177/09544054231178978","DOIUrl":"https://doi.org/10.1177/09544054231178978","url":null,"abstract":"In this study, a CBN liquid-body-armor-like grinding wheel was developed for high-shear and low-pressure (HSLP) grinding of Inconel718 alloy. The material removal mechanism of the novel CBN liquid-body-armor-like wheel was introduced in detail. Particle clustering effect of the new wheel was studied via the finite element method. A series of grinding tests were carried out to investigate the grinding performance under the various conditions. It was shown that the surface roughness Ra of the ground workpiece decreased from initial 0.3 to 0.094 μm. Simultaneously, the specific material removal rate of 1.069 × 105 μm3/mm·s was attained. The power spectral density function (PSDF) was employed to reveal the percentage of waviness and roughness of the surface profile, which was mainly concentrated in 0–40k Hz as compared with 60–120k Hz before grinding. It indicated that particle clustering effect was generated in the grinding zone. Besides, the maximum peak amplitude of the cross-correlation function coefficient of the ground workpiece surfaces before and after grinding was less than 0.3. The original scratches were completely removed. New and smooth textures generated after grinding. The experimental results demonstrated that the newly developed CBN liquid-body-armor-like grinding wheel was effective for surface finishing of the Inconel718 workpiece.","PeriodicalId":20663,"journal":{"name":"Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture","volume":"75 48","pages":""},"PeriodicalIF":2.6,"publicationDate":"2023-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72445164","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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: 1

Single diamond grit scratching of unidirectional C_f/SiC composite: Mechanical responses and fracture mechanism 单向Cf/SiC复合材料单金刚石磨痕的力学响应及断裂机理

3区工程技术

Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture Pub Date : 2023-06-08 DOI: 10.1177/09544054231180334

Qingxia Wang, Jiazhou Wen, Chongjun Wu, Chao Luo, Zhijian Lin, Steven Y Liang

{"title":"Single diamond grit scratching of unidirectional C<sub>f</sub>/SiC composite: Mechanical responses and fracture mechanism","authors":"Qingxia Wang, Jiazhou Wen, Chongjun Wu, Chao Luo, Zhijian Lin, Steven Y Liang","doi":"10.1177/09544054231180334","DOIUrl":"https://doi.org/10.1177/09544054231180334","url":null,"abstract":"C f /SiC composite is a typical heterogeneous brittle composite material, its precision machining has always been affected by the complicated removal mechanism. This paper conducted a single diamond grit scratching experiment on the unidirectional C f /SiC composite to investigate the material’s mechanical response under different loads and scratching depths. The scratching force and acoustic emission signals were measured to reveal the removal characteristics. The scratching removal behavior of SiC matrix and carbon fibers in the two-phase component of unidirectional C f /SiC composites was analyzed based on the fracture size and fiber fracture morphology. The results show that the parallel scratching process could produce a better strength resistance with mild rupture features of fiber extrusion fracture and shear removal. While the perpendicular scratching process is generally resulting in crack propagation along the fiber direction with interface failure and bending fracture failure along the moving direction.","PeriodicalId":20663,"journal":{"name":"Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135214977","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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: 1

Research on the mechanism of particles separation in magnetorheological fluid-based finishing process 磁流变液基整理过程中颗粒分离机理的研究

IF 2.6 3区工程技术

Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture Pub Date : 2023-06-06 DOI: 10.1177/09544054231178967

N. Dubey, A. Sidpara, R. Lakkaraju

引用次数: 0

Tuning 3D-printing parameters to produce vertical ultra-hydrophobic PETG parts with low ice adhesion: A food industry case study 调整3d打印参数以生产低冰粘附的垂直超疏水性PETG部件:食品行业案例研究

IF 2.6 3区工程技术

Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture Pub Date : 2023-06-06 DOI: 10.1177/09544054231178970

P. E. Romero, Juan M Barrios, E. Molero, A. Bustillo

{"title":"Tuning 3D-printing parameters to produce vertical ultra-hydrophobic PETG parts with low ice adhesion: A food industry case study","authors":"P. E. Romero, Juan M Barrios, E. Molero, A. Bustillo","doi":"10.1177/09544054231178970","DOIUrl":"https://doi.org/10.1177/09544054231178970","url":null,"abstract":"The food industry is a dynamic component of the European economy. A wide variety of products and small batch are demanded in a market that is accustomed to frequenting changes in food packaging formats. Cheaper and lighter 3D-printed tools are replacing expensive metallic ones, producing previously impossible product geometries and processing fish and meat products more quickly and in more reliable ways. In addition to food contact, these printed parts are often required to have hydrophobic surfaces that facilitate cleaning and have low adhesion both foodstuffs and ice. In this study, the surface wettability of PolyEthylene Terephthalate Glycol (PETG) printed parts via fused filament fabrication is assessed. Specifically, several printing parameters (layer height, extrusion temperature, printing speed, acceleration, and flow) and their influence on the hydrophobicity of 3D printed parts with vertical orientation are analyzed. The experimental results indicated that the parameter with the strongest influence on the wettability of the XZ parts was flow: low-flow values generated ultra-hydrophobic surfaces, with contact angles higher than 120°. Acceleration had no influence at low flow values; however, for high flow values, low acceleration rates yielded higher contact angles. In addition, it was experimentally proven that the 3D-printed PETG parts with high-contact angle surfaces showed lower adhesion to ice than those with low contact-angle surfaces. The technology was applied to a case study of a 3D-printed hopper for the ice duct of an ice-cube machine.","PeriodicalId":20663,"journal":{"name":"Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture","volume":"234 1","pages":""},"PeriodicalIF":2.6,"publicationDate":"2023-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80317931","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 digital twin-driven dynamic path planning approach for multiple automatic guided vehicles based on deep reinforcement learning 基于深度强化学习的多自动引导车辆数字化双驱动动态路径规划方法

IF 2.6 3区工程技术

Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture Pub Date : 2023-06-06 DOI: 10.1177/09544054231180513

Qiangwei Bao, Pai Zheng, Sheng Dai

{"title":"A digital twin-driven dynamic path planning approach for multiple automatic guided vehicles based on deep reinforcement learning","authors":"Qiangwei Bao, Pai Zheng, Sheng Dai","doi":"10.1177/09544054231180513","DOIUrl":"https://doi.org/10.1177/09544054231180513","url":null,"abstract":"With the increasing demand for customization, the tendency of mechanical manufacturing has gradually shifted to flexible and mixed-line production, which brings new challenges to the existing scheduling pattern. As an indispensable part, logistics is responsible for establishing connections among various production equipment and processes. Meanwhile, the promotion of digital twin theory introduces an application schema for the logistics system. However, there is still a deficiency in the real-time dispatching and path planning of logistics equipment due to the uncontrollability of algorithm efficiency for complex scenes. To fill this gap, a digital twin-driven dynamic path planning approach for multiple automatic guided vehicles (AGVs) is proposed. Firstly, the AGVs are virtualized as the major component of logistics systems, while the ontology expression of logistics tasks is consistently accomplished as well. Secondly, the digital twin-driven application framework of multi-AGV dispatching is established. Moreover, a dynamic path planning method for AGVs relying on deep reinforcement learning is implemented. A segmented path planning method is illustrated considering potential route conflicts, which is regarded as the key contribution of the presented research. At last, a case study is illustrated to show the entire process of multiple vehicle path planning and conflict resolution.","PeriodicalId":20663,"journal":{"name":"Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture","volume":"31 1","pages":""},"PeriodicalIF":2.6,"publicationDate":"2023-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88827517","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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: 1

Finishing nonuniformity for electrical discharge machined closed complicated flow channels by abrasive flow machining 电火花加工封闭复杂流道的磨粒流精加工不均匀性

IF 2.6 3区工程技术

Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture Pub Date : 2023-06-06 DOI: 10.1177/09544054231179247

Wulin Fan, Yuli Sun, Jianshe Zhao, Fanxuan Yang, Yanlei Liu

{"title":"Finishing nonuniformity for electrical discharge machined closed complicated flow channels by abrasive flow machining","authors":"Wulin Fan, Yuli Sun, Jianshe Zhao, Fanxuan Yang, Yanlei Liu","doi":"10.1177/09544054231179247","DOIUrl":"https://doi.org/10.1177/09544054231179247","url":null,"abstract":"Abrasive flow machining (AFM) is increasingly preferred to finish closed complicated flow channels machined by electrical discharge machining (EDM) owing to its high machining accessibility, surface integrity, and efficiency. The machining accuracy of closed complicated flow channels by AFM is dependent on the uniformity of material removal distribution (named as finishing nonuniformity here), but few studies on the finishing nonuniformity have been done so far. Firstly the finishing nonuniformity for EDM machined complicated flow channel by AFM was modeled and analyzed theoretically. Then three blisk with EDM surface roughness of Ra 1.5 μm, Ra 2.0 μm, and Ra 3.0 μm were finished by AFM to Ra 0.8 μm, and their finishing nonuniformity was compared. Finally, AFM flow simulation was carried out, and the simulation results were compared with that from the experiments. Theoretical results showed that finishing nonuniformity is resulted from the non-uniform flow field of the abrasive medium, and it increases with increasing EDM surface roughness and decreasing AFM surface roughness. This is verified by the AFM experiments and flow simulations. On this basis, the guideline for parameter optimization in the combined EDM + AFM process was discussed.","PeriodicalId":20663,"journal":{"name":"Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture","volume":"38 1","pages":""},"PeriodicalIF":2.6,"publicationDate":"2023-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73962931","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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: 1