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检索条件"丛书名=Mechanisms and Machine Science"

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Prediction of Mechanical Properties of Prestressed Concrete Containment Based on Artificial Intelligence Method 30th

Prediction of Mechanical Properties of Prestressed Concrete ...

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30th International Conference on Computational and Experimental Engineering and sciences

作者： Zheng, Yuhan Mao, Minghui Xue, Qichao Lan, Tianyun Xu, Zhengyu Liu, Zongmin Mao, Jize Harbin Engn Univ Coll Aerosp & Civil Engn Harbin Peoples R China China Gen Nucl Power Design Co Ltd Shenzhen Shenzhen Peoples R China State Key Lab Nucl Power Safety Monitoring Techno Shenzhen Peoples R China Gen Clean Energy Co Ltd Shenzhen Peoples R China

ISBN: (纸本)9783031816758;9783031816734;9783031816727

As the last barrier of nuclear materials, the concrete containment is often in a rapidly changing extreme condition in the event of an accident. This study uses artificial intelligence (AI) techniques to establish a correlation between the position of the containment and stress-strain values under such extreme working conditions, aiming for efficient and accurate prediction of mechanical properties. Finite element (FE) software is utilized to analyze the containment structure, generating batches of prestressed concrete models under various internal pressure conditions. The internal pressure value and three-dimensional coordinates of the containment are considered as input values in artificial intelligence algorithms, while the maximum principal stress or equivalent plastic strain as output values. This work shows that AI models can offer significant advantages in terms of time efficiency by replacing laborious finite element simulation modeling, analysis, and post-processing procedures while enabling predictions regarding containment structural stresses under extreme conditions. Furthermore, these trained models possess remarkable generalization capabilities allowing them to predict stress and strain for a wider range of internal pressure scenarios.

关键词： Prestressed concrete containment machine learning Finite element analysis Mechanical properties Structural performance prediction

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Evolutionary Strategy for Performance-Based Seismic Design of High-Rise Structures: Novel Methodologie and Efficiency Analysis 30th

Evolutionary Strategy for Performance-Based Seismic Design o...

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30th International Conference on Computational and Experimental Engineering and sciences

作者： Almajhali, Khalil Yahya Mohammed He, Minjuan Alhaddad, Wael Halabi, Yahia Tongji Univ Dept Struct Engn Shanghai Peoples R China Southwest Jiaotong Univ Sch Civil Engn Chengdu Sichuan Peoples R China

ISBN: (纸本)9783031816758;9783031816734;9783031816727

The practice of Performance-Based Seismic Design (PBSD) is integral to enhancing the safety and sustainability of high-rise structures. As seismic events pose significant risks, employing innovative and sustainable strategies in PBSD is crucial for optimizing building resilience. This study proposes cutting-edge methodologies that streamline the preliminary design phase and introduce optimization techniques to refine structural performance. Advanced tools like Perform-3D and ETABS are employed for nonlinear time history analysis, which assesses how initial designs measure up to ultimate safety and performance standards during severe earthquakes. The research examines three critical performance levels-Immediate Occupancy (IO), Life Safety (LS), and Collapse Prevention (CP)-and demonstrates a marked improvement in structural responses with the implementation of the ladder system as compared to the traditional outrigger system, reducing lateral displacement by 37.29% and base shear by 15%. These promising results emphasize the need for an efficient initial design and advocate for further research to broaden the application and enhance the efficacy of these innovative PBSD methodologies.

关键词： Performance-based seismic design High-rise buildings Ladder dstructure system Outrigger structure system

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Using Experimental Results to Determine Calculation Parameters for Press Fitting Ball Bearings into 3D Printed Parts 12th

Using Experimental Results to Determine Calculation Paramete...

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12th International Conference of machine and Industrial Design in Mechanical Engineering

作者： Palic, Srecko Petrovic, Nenad Palic, Nikola Milenkovic, Strahinja Pesic, Zivana Jovanovic Univ Kragujevac Fac Engn Kragujevac Serbia

ISBN: (纸本)9783031805141;9783031805127;9783031805110

This research paper considers an experimental approach to determining the parameters necessary for the calculation of a compressed assembly of a 3D-printed plastic housing and a radial ball bearing. The housing was produced using FDM (Fused Deposition Modeling) technology and PET-G filament with a cross-section of 1.75 mm. Printed bearing seats were made in resolutions of 0.16 mm and 0.2 mm. The experiment was conducted on samples where the required compression force and the force of assembly between the bearing and the housing were examined. The bearing seats have a nominal measurement smaller by 0.2 mm in the model than the bearing being installed. The dimensions of the housing openings were measured after printing to determine roundness. Using the data obtained experimentally, results were put into the expressions for forces required to assemble and disassemble the parts, and friction coefficients were derived from them. These coefficients can be used as guidelines for calculating and designing 3D-printed openings into which metal parts are pressed.

关键词： 3D printing press fit tolerances calculation experiment

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Tire Viscoelasticity Characterization for Adhesion Phenomena Analysis by Using the VESevo Innovative Technology 5th

Tire Viscoelasticity Characterization for Adhesion Phenomena...

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5th International Conference of International-Federation-for-the-Promotion-of-Mechanism-and-machine-science Italy (IFToMM Italy)

作者： Stefanelli, Raffaele Suera, Raffaele Aprea, Marco Timpone, Francesco Farroni, Flavio Univ Naples Federico II Via Claudio 21 Naples Italy

ISBN: (纸本)9783031645716;9783031645693;9783031645686

In vehicle dynamics, the study of the viscoelastic characterization of tires is crucial for a better understanding of the adhesion phenomenon during tire-road interaction, with the ultimate goal of enhancing vehicle performance and safety. The viscoelastic characterization of polymeric specimens traditionally involves costly and destructive practices. However, the development of the VESevo device has allowed to overcome these limitations for tire viscoelasticity characterization. This paper presents an analysis on tire adhesion by considering three different compounds tested with the VESevo device, to compare the acquired curves with and without the use of talc on the compound. Additionally, since the adhesion phenomenon is dependent on temperature, the various specimens were heated to explore the thermal effect. The paper investigates the adhesion variances among soft, medium, and hard compounds under changing temperature and compound conditions, commencing with rebound curve comparisons with and without talc.

关键词： Tire Adhesion Viscoelasticity Rebound Curves VESevo Device

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Neural Network-Assisted Kalman Filtering for Dynamic Response Reconstruction 30th

Neural Network-Assisted Kalman Filtering for Dynamic Respons...

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30th International Conference on Computational and Experimental Engineering and sciences

作者： Wang, Yiqing Song, Mingming Sun, Limin Tongji Univ Shanghai 200092 Peoples R China

ISBN: (纸本)9783031774911;9783031774898;9783031774881

The purpose of structural health monitoring (SHM) for structural assessment and damage identification is based on dynamic response data collected by monitoring systems. However, economic constraints and the complexity of civil structures prevent monitoring systems from acquiring complete structural response information, which hinders accurate structural assessment with sparse sensors. Therefore, response reconstruction of all degrees of freedom from limited measurement data will significantly enhance SHM performance. The Kalman filtering (KF) is commonly used for response reconstruction, which provides optimal solution for systems well-represented by a fully known Gaussian linear state space model. However, the KF assumes that measurement and process noise follow a known white Gaussian noise distribution, which is impractical in many civil engineering applications considering the variations of environmental conditions and non-negligible modeling errors. To overcome this challenge, a hybrid modeling technique, called KalmanNet, is applied in this study for state estimation of partially known systems. The KalmanNet integrates a recurrent neural network (RNN) module into the process of KF, which replaces the computation process of Kalman gain. The RNN learns to compute Kalman gain from actual monitoring data under the influence of uncertain noise distribution and modeling errors, without necessitating any Gaussian assumptions or noise covariance specifications. A three-story shear-wall structure is taken as a numerical study where different types of noise and modeling errors are studied. The results show that the KalmanNet can effectively reconstruct structural response from sparse measurements in real time with high accuracy under the influence of non-Gaussian noise and modeling errors.

关键词： KalmanNet response reconstruction Kalman filter hybrid modeling recurrent neural network

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Evolution and Tendencies in Design and Exploitation of Cutting Tools and Processes 12th

Evolution and Tendencies in Design and Exploitation of Cutti...

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12th International Conference of machine and Industrial Design in Mechanical Engineering

作者： Dragoi, Mircea-Viorel Transilvania Univ Brasov Dept Mfg Engn Bdul Eroilor 29 Brasov 500036 Romania

ISBN: (纸本)9783031805141;9783031805127;9783031805110

Even if the cutting tools and cutting processes are well-established domains, they are still actual and in continuous development. The article investigates the evolution of these domains in the last fifteen years and identifies some narrower specific areas of research within the large domain of cutting technologies. Some particular categories of cutting tools and processes are the subject of the research: milling, turning, and drilling. The data were collected from mainstream manufacturing engineering journals. They reveal a continuous increase in the number of articles published, with very few exceptions. Based on the findings of the investigation, and on the new demands of the industry, some future research directions are identified and stated.

关键词： Cutting tools Cutting processes Milling cutters Turning tools Drills

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Thick Steel Plates Stamping After Welding Process 12th

Thick Steel Plates Stamping After Welding Process

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12th International Conference of machine and Industrial Design in Mechanical Engineering

作者： Matysiak, Waldemar Hajkowski, Jakub Czarnecka-Komorowska, Dorota Duspara, Miroslav Poznan Univ Tech Ul Piotrowo 3 PL-60965 Poznan Poland Univ Slavonski Brod Trg Ivane Brlic Mazuran 2 Slavonski Brod 35000 Croatia

ISBN: (纸本)9783031805141;9783031805127;9783031805110

The aim of the scientific research was to develop a method for stamping thick welded sheets. The paper presents the results of theoretical analysis and experimental details of thick steel plate stamping after welding process. During this process material flow kinematics, strain and damage criterion distributions and shaping were analyzed. On the basis of the obtained results, the analysis of limiting phenomena, which could appear during the process were made. Experimental tests in industrial conditions according to designed technology were carried out. Known methods of forming sheet metal by stamping can be divided into: stamping of thick and thin sheets, depends of sheet metal to a given category is the ratio of the sheet thickness g to its diameter d. Previously known methods and methods of stamping welded sheets apply thin sheets with a thickness of 0.7 - 2.0 [mm]. The technology allows you to make stampings from welded thick sheets, using generally available tools in the form of punches and matrices. This method is especially applicable to the production of elements from which require different properties such as tensile strength, thermal conductivity, density at various points. Technology allows for shaping stampings made of sheet metal semi-finished products of various sizes thicknesses that have been combined into one semi-finished product from at least two other sheets made of the same or different materials. Good quality of specimens stamping were obtained. It was found that stamping of thick steel plate after welding process is feasible.

关键词： Stamping Thick Steel Plate Welding Process Metal Plastic Working

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Preliminary Design and Analysis of the 3-UCU Parallel Mechanism 6th

Preliminary Design and Analysis of the 3-UCU Parallel Mechan...

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6th Symposium on Mechanism Design for Robotics (MEDER)

作者： Bouzgarrou, Chedli Arrouk, Khaled Assad Univ Clermont Auvergne Inst Pascal Dept M3G Clermont Auvergne INP F-63000 Clermont Ferrand France Al Baath Univ Fac Mech & Elect Engn Dept Mech Design & Prod Homs Syria

ISBN: (纸本)9783031673856;9783031673832;9783031673825

Parallel kinematic machines (PKMs) have been widely studied in the past, but the design and analysis of these mechanisms are still challenging. In this paper, we show that the use of an original linear-angular transmission allows the design of a compact and rigid 6-degree-of-freedom (DOF) PKM with only three limbs. The proposed 3-UCU architecture has partially decoupled kinematics, which simplifies its control. This paper highlights some interesting properties of the proposed design through its analytically developed kinematic and static models.

关键词： Parallel kinematic machines linear-angular transmission decoupled kinematics kinematic analysis static analysis

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Effects of Coupling Strategy on Performance of Overlapping Particle Technology for SPH Method 30th

Effects of Coupling Strategy on Performance of Overlapping P...

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30th International Conference on Computational and Experimental Engineering and sciences

作者： Luo, Jianqiao Yu, Ning Meng, Junhui Beijing Inst Technol Beijing Peoples R China Beijing Inst Technol Chongqing Innovat Ctr Chongqing Peoples R China

ISBN: (纸本)9783031816758;9783031816734;9783031816727

The Smoothed Particle Hydrodynamics (SPH) method has been widely applied to study complex flows with free surfaces for its capability to accurately capture large deformations. However, fully exploiting its advantages requires a sufficiently fine resolution, which can be computationally intensive. The Overlapping Particle Technique (OPT) divides the original problem domain into multiple sub-domains, allowing for variable resolutions and avoiding interactions among particles of different masses, thereby reducing computational efforts. The coupling between the sub-domains is the primary factor that affects the accuracy and stability of the solution. In this paper, a one-way OPT framework is presented for dam-break flow to investigate the inherent relationship between coupling strategy and computational performance. Two sub-domains are utilized to model the entire physical fields, in which the one with higher resolution is fully covered by the other, and an inlet-outlet boundary is added at the overlapping region to maintain the coupling. To improve computational efficiency, the position-based Verlet integration scheme is employed, and time marching is controlled by dual time-stepping criteria. Through numerical simulations based on the Weak Compressible SPH scheme, the effects of interpolation formulas, particle generation positions, and the resolution ratio between sub-domains on the solutions of 2D dam-break flow are explored and analyzed. The results demonstrate that the corrected interpolation formula outperforms the conventional formula in nearly all cases. Moreover, a smaller spacing of particle generation positions typically results in higher accuracy, while a sparsely distributed candidate position may lead to the formation of non-physical cavities near the inlet-outlet boundary. Additionally, the resolution ratio has a relatively minor impact when the corrected interpolation is adopted, whereas a large resolution ratio can reduce the error via the smoothing ef

关键词： Smoothed particle hydrodynamics Overlapping particle technique Multi-resolution Dam-break flow Interpolation formula Particle generation

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Proposal for a Design of an Abrasive Disc machine for Grinding Metal Specimens and Samples 12th

Proposal for a Design of an Abrasive Disc Machine for Grindi...

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12th International Conference of machine and Industrial Design in Mechanical Engineering

作者： Cruz-Aragon, Juan T. Vite-Torres, Manuel Gallardo-Hernandez, Ezequiel A. Inst Politecn Nacl ESIME UZ Mexico City DF Mexico

ISBN: (纸本)9783031805141;9783031805127;9783031805110

Grinding is a crucial process that helps improve surface quality, adjust geometry, eliminate defects and damage, control tolerances, reduce friction and wear on critical components. It is utilized in the field of tribology and in applications related to the production of parts and sliding surfaces, particularly in industries such as aerospace, automotive, medical, tool manufacturing, and railways. This article outlines a proposed design for a functional abrasive disc machine that can be used to grind metal specimens and finish hard materials. The goal of this equipment is to aid in the study and simulation of abrasive machining processes in tribological systems. This machine is column-shaped and designed to save space. It has several useful features including a linear loading system that ensures precise and uniform loading, an integrated lubrication system that provides a constant flow of lubricant during the abrasion process, and a variable speed slide that allows for precise control over the feed speed of the workpiece. The angle of attack of the abrasive disc is also adjustable, and the machine has a variable diameter speed system that simplifies speed control using only mechanical elements. Additionally, there are sensors that collect data on the abrasion process. To design a small machine with medium power, good precision, and high levels of automation for grinding metal specimens and rails, we utilized the Quality Function Deployment (QFD) methodology. This involved identifying user needs, translating requirements into engineering terms, generating design concepts, and creating calculation reports and corresponding plans.

关键词： Abrasion Abrasive Machining Abrasive Disc Abrasion Efficiency Abrasive Wear Abrasive Efficiency Rail Grinding

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