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Boundary Condition and Equivalent Mass-Spring-Damper System for a Truncated Railway Track 14th

Boundary Condition and Equivalent Mass-Spring-Damper System ...

引用

14th International Workshop on Railway Noise (IWRN)

作者： Sheng, X. Peng, Y. Shanghai Univ Engn Sci Sch Urban Railway Transportat Shanghai 201620 Peoples R China Southwest Jiaotong Univ State Key Lab Rail Transit Vehicle Syst Chengdu 610031 Sichuan Peoples R China

ISBN: (纸本)9789819978519;9789819978526

To deal with vehicle/track interaction in the time domain, the infinitely long railway track often has to be truncated, generating a finite track model. The ends of the rail in the model are normally simply supported. To account for high-frequency vibration, high train speed and the presence of multiple carriages, the track model must be long, demanding too much computational effort. Means is required to shorten the track model. Aiming at this, the track is divided into three parts, a left semi-infinite part, a middle part (the track model) and a right semi-infinite part. The left and right parts are assumed to be two semi-infinite periodic tracks. The semi-infinite periodic track is replaced with an equivalent mass-spring-damper system. The mass-spring-damper system is determined in such a way that it provides the same receptance to the track model as the semi-infinite periodic track. The receptance of the semi-infinite periodic track is calculated from the response of the two semi-infinite periodic tracks joined together as an infinite periodic structure subject to specific harmonic loads.

关键词： Track model Semi-infinite track Equivalent mass-spring-damper system

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Cognitive Ergonomics in Industry 5.0 32nd

Cognitive Ergonomics in Industry 5.0

引用

32nd International Conference on Flexible Automation and Intelligent Manufacturing

作者： Trstenjak, Maja Hegedic, Miro Cajner, Hrvoje Opetuk, Tihomir Tosanovic, Natasa Univ Zagreb Fac Mech Engn & Naval Architecture Ivana Lucica 5 Zagreb 10000 Croatia

ISBN: (纸本)9783031381645;9783031381652

Industry 5.0 is a concept that represents a human-centered, resilient, and sustainable manufacturing system. With the increase in the importance of the human role within the system, there is a need to adapt standard ergonomic methods to ensure safety within the work environment. The human-centered approach extends the limits of work safety to well-being principles while the new digital technologies which seek human interaction demand enhanced cognitive functions. In this paper, the principles of cognitive ergonomics will be presented as their current use inmanufacturing. Due to digitalization, the human operators' role demands changes to the principles of Industry 5.0 ergonomics. The novel framework of cognitive ergonomics implementation in Industry 5.0 will be presented based on a literature review. Results will be used in a future work to implement the novel and innovative digital production and process planning system in the local stove manufacturing company.

关键词： Industry 5.0 Ergonomics cognitive ergonomics human factors production optimization

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Bi-objective Sound Transmission Loss Optimal Design of Double Panels Using a Genetic Algorithm 14th

Bi-objective Sound Transmission Loss Optimal Design of Doubl...

引用

14th International Workshop on Railway Noise (IWRN)

作者： Zhang, Y. M. Zhao, Y. Yao, D. Li, Y. Xiao, X. B. Zuo, K. C. Pan, W. J. Univ China Civil Aviat Flight 46 Nanchang Rd Guanghan Sichuan Peoples R China China Aerodynam Res & Dev Ctr Key Lab Aerodynam Noise Control Mianyang 621000 Sichuan Peoples R China Southwest Jiaotong Univ 111 Second Ring Rd Chengdu Sichuan Peoples R China

ISBN: (纸本)9789819978519;9789819978526

This paper presents a bi-objective optimization of double panels for simultaneously minimizing mass while maximizing the weighted sound transmission loss (STL). Firstly, the acoustic model of double panels is introduced based on the wave propagation method and modal superposition method. Secondly, the optimization problem is formulated as a bi-objective programming model, and a solution algorithm based on the non-dominated sorting genetic algorithm II (NSGA-II) is provided to solve the proposed model. Finally, taking a standard window structure on a high speed train as a reference structure, an optimization calculation based on non-dominated sorting genetic algorithm II (NSGA-II) is carried out to get the Pareto front solutions. The fitting formula of the mass and weighted STL (R-w) under the Pareto front solution is obtained, which provides a reference for the design and selection of Rw under different masses. The frequency sound insulation characteristics and its STL mechanism of the optimized double panel are further analyzed, which shed some light on the lightweight design of double panel structures. Relative optimization method can also be applied to airplane's window design.

关键词： Double panel Transmission Lightweight Pareto Front

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Neural Network Tire Force Modeling for Automated Drifting 16th

Neural Network Tire Force Modeling for Automated Drifting

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16th International Symposium on Advanced Vehicle Control

作者： Broadbent, Nicholas Drake Weber, Trey Mori, Daiki Gerdes, J. Christian Stanford Univ Stanford CA 94305 USA

ISBN: (纸本)9783031703942;9783031703928;9783031703911

Automated drifting presents a challenge problem for vehicle control, requiring models and control algorithms that can precisely handle nonlinear, coupled tire forces at the friction limits. We present a neural network architecture for predicting front tire lateral force as a drop-in replacement for physics-based approaches. With a full-scale automated vehicle purpose-built for the drifting application, we deploy these models in a nonlinear model predictive controller tuned for tracking a reference drifting trajectory, for direct comparisons of model performance. The neural network tire model exhibits significantly improved path tracking performance over the brush tire model in cases where front-axle braking force is applied, suggesting the neural network's ability to express previously unmodeled, latent dynamics in the drifting condition.

关键词： Machine Learning Tire Modeling Autonomous Driving

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A Preliminary Study Towards the Understanding of the Pantograph-Catenary Irregular Wear Problem in the Rigid Overhead Catenary System 14th

A Preliminary Study Towards the Understanding of the Pantogr...

引用

14th International Workshop on Railway Noise (IWRN)

作者： Gu, Xiaohan Phrain Wang, Anbin Wu, Qirui Ma, Ziyan Shanghai Univ Engn Sci Sch Urban Railway Transportat 333 Longteng Rd Shanghai 201620 Peoples R China

ISBN: (纸本)9789819978519;9789819978526

This paper presents some early-stage works and findings of the irregular wear problem found in pantograph-catenary interaction with rigid overhead catenary system of metro lines. Laboratory tests and computational simulation were conducted to examine the vibration characteristics of the coupled system. It was found that the wear pattern of pantograph strips resembles the mode shape of dominant natural frequencies in the high-frequency range, indicating that resonance happens at the carbon strip and contact wire sliding interface, leading to poor contact quality. Damping treatments were applied to standard pantograph strips, to improve the damping performance of pantograph strips to control high frequency vibration of pantograph strips. Laboratory tests and field tests were carried out to evaluate the damping performance and vibration characteristics of damping treated pantograph strips. It was found that applied damping treatment was able to achieve a maximum of 7 dB of vibration reduction. The worse the initial condition of the pantograph-catenary system, the more prominent the damping effects on the control of high frequency vibration.

关键词： Pantograph-catenary system Irregular wear Vibration characteristics Damping performance Pantograph strips

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Framework for Optimization of Multi-source Railway High Speed Noise Models Through Hybrid Methods Combining Acoustic Simulations and Close Perimetric Noise Measurements 14th

Framework for Optimization of Multi-source Railway High Spee...

引用

14th International Workshop on Railway Noise (IWRN)

作者： Sica, Gennaro Sole, Jaume Huguenet, Pierre Bewes, Oliver HS2 Ltd Podium Euston1 Eversholt St London NW1 2DN England SENER Ingn & Sistemas Noise & Vibrat Tech Off C Creu Casas I Sicart 86-88 Barcelona 08290 Spain

ISBN: (纸本)9789819978519;9789819978526

The prediction of future noise levels of railway lines prior to their construction has evolved with the years. This evolution has reflected the fact that aerodynamic noise sources at high speed are not only placed at low height, but also in the upper parts of the train (Gautier et al. in High speed trains external noise: a review of measurements and source models for the TGV case up to 360 km/h, Seoul, 2008 [1];Noh in J Rail Rapid Transit 228:307-322, 2014 [2]). It is common practice in environmental noise modelling to represent a train by multiple sources with speed relationships (Marshall et al in Derivation of sound emission source terms for high speed trains running at speeds in excess of 300 km/h. Springer, Berlin, Heidelberg, pp. 497-504, 2015 [5]). Careful estimation of the emission laws of these sources is critical for estimating the noise impact in the surroundings, particularly in presence of barriers or where buildings overlook the railway. Building on the results and conclusions previously reported by the authors in (Sica et al. in Pass-by noise assessment of high-speed units by means of acoustic measurements in a perimeter close to the train, Ghent, 2019 [1]), this work presents a framework for optimizing a multi-source railway noise model by combining accurate simulation with test data obtained with microphones close to the perimeter of the railway. Acoustic models to determine the screening of noise sources by the train body and other complex acoustic phenomena (i.e. directivity, diffusion and diffraction) have been coupled to numerical optimization tools, in order to improve accuracy of noise estimations of the multi-source railway noise model.

关键词： Railway noise prediction Pantograph Rolling noise

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Visualization Experiments of Radiation Heating on the Eutectic Reaction Between B4C-SS and Its Relocation Behavior

Visualization Experiments of Radiation Heating on the Eutect...

引用

Saudi International Conference on Nuclear Power engineering (SCOPE)

作者： Ahmed, Zeeshan Sharma, Avadhesh Kumar Pellegrini, Marco Yamano, Hidemasa Okamoto, Koji Univ Tokyo Dept Nucl Engn & Management 7-3-1 HongoBunkyo Ku Tokyo 1138656 Japan Japan Atom Energy Agcy JAEA 4002 Narita Cho Oarai Ibaraki 3111393 Japan Vellore Inst Technol Chennai Dept Mech Engn Chennai Tamil Nadu India

ISBN: (纸本)9783031643613;9783031643620

Generation IV Sodium-cooled Fast Reactor (SFR) development faces a critical challenge with Core Disruptive Accidents (CDAs). Boron migration resulting from the eutectic reaction between boron carbide (B4C) and Stainless Steel (SS) can lead to molten pool formation, affecting neutron balance within the core. This study employs quantitative, high-resolution visualization using radiative heating to observe eutectic behavior and melt structure during boron migration. Experiments, simulating control rod design, cover the temperature range of 1150 degrees C to 1372 degrees C, focusing on long-duration melting and relocation behavior. Results show the eutectic temperature for pellets surpassing that of powder, unaffected by heating rate. Two failure mechanisms are identified: SS peeling off B4C, forming molten droplets, and B4C pellets breaking into pieces due to thermal stress, with sintering in the powder case. Visualization accurately determines eutectic melting onset, pointing to differing values for pellets and powder. This study enhances understanding of eutectic reaction mechanisms, contributing to CDA safety in SFRs.

关键词： B4C Stainless Steel-304 (SS) Eutectic melting Radiative heating visualization Sodium-cooled fast reactor

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Airflow Analysis Inside and Outside the Nozzle in Shot Peening Process 3rd

Airflow Analysis Inside and Outside the Nozzle in Shot Peeni...

引用

3rd International Conference on Advanced Surface Enhancement (INCASE)

作者： Nambu, Koichiro Saeki, Yusuke Okumiya, Masahiro Osaka Sangyo Univ 3-1-1 Nakagaito Daito Osaka Japan Toyota Technol Inst 2-12-1 Hisakata Nagoya Aichi Japan

ISBN: (纸本)9789819986422;9789819986439

Surface modification treatments using particle impact, such as shot peening and fine particle peening, are used in many parts such as automotive gears. However, the surface modification effect is affected by many factors such as the material of the projectile, particle size, and nozzle diameter. In the case of the air injection type, the airflow inside and outside the nozzle has a particularly large effect. However, few studies have examined the effects of airflow inside and outside the nozzle. In this study, the airflow inside and outside the nozzle was analyzed using the finite element method. As a result, it was found that the airflow velocity increases as the nozzle diameter increases. It was also clarified that the factors causing this increase were the lengthening of the potential core section and the deceleration caused by the wall resistance.

关键词： Shot peening Fine particle peening FEM Airflow

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Comparison of Environmental Analysis Results from Two IT Tools Based on an Additive Manufactured Prosthesis 8th

Comparison of Environmental Analysis Results from Two IT Too...

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8th International Scientific-Technical Conference (MANUFACTURING)

作者： Dudkowiak, Anna Dostatni, Ewa Czerw, Alicja Poznan Univ Tech Pl Marii Sklodowskiej Curie 5 PL-60965 Poznan Poland

ISBN: (纸本)9783031564581;9783031564567

Theworld is currently confrontingmany environmental problems, such as global warming, air pollution and plastic pollution. Human impact on the environment has been increasing over the decades. Governments are trying to change the way large companies and industries think about the consequences of their actions and force them to become more environmentally friendly. As a result, we are witnessing an increase in the popularity of eco-design. One technique used to prevent environmental crisis is life cycle assessment (LCA). IT systems have become crucial tools for assessing the life cycle of a product's environmental impact. They make it possible to perform a thorough analysis of the entire life cycle of a product and learn about its environmental impact. The purpose of this article is to compare two systems for performing environmental analysis of the entire product life cycle: GaBi and SimaPro. The simplicity of the preparation of life cycle models and the results of environmental analysis were evaluated. In order to compare the functionality of the two systems, it was decided to model the selected product, which was a prosthesis made of PLA using additive technology. The study performed in both systems also makes it possible to determine whether the choice of an IT tool for performing environmental analysis of a product has a significant impact on the results of this analysis.

关键词： Ecodesign Additive manufacturing Life Cycle Assessment LCA methods of analysis GaBi SimaPro

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Study of the Effect of Laser Cutting Technologies in Manufacturing of Structural Steel Components 1

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33rd International Conference on Flexible Automation and Intelligent Manufacturing

作者： Olmez, Hasan N. Shamlooei, Majid Zanon, Gabriele Brugnolli, Marco Bursi, Oreste S. Univ Trento Dept Civil Environm & Mech Engn I-38123 Trento TN Italy Adige Sys BLM Grp I-38056 Levico Terme TN Italy

ISBN: (数字)9783031744853

ISBN: (纸本)9783031744846;9783031744853

The advantages of laser cutting technology are undeniable, particularly due to its high-speed, precision, and capability to cut complex 3D geometries. However, the thermal process associated with laser cutting involves complex physical phenomena that can alter material properties. The improvements achieved in recent years in laser cutting technology offer the possibility of using different laser cutting setups for various applications. The assist gas plays an important role in both the chemical and physical aspect of the process, as well as in the temperature distribution near the cut surface. This study focuses on mild steel S235, commonly used in structural applications. To investigate the influence of the aforementioned parameters, an experimental campaign was carried out considering two cutting techniques and different cutting geometries. Temperature profiles were obtained using an infrared camera from specimens processed. Experimental data were used to calibrate and validate the 3D numerical model developed based on the finite element (FE) method to conduct thermomechanical analyses of the process. The proposed FE model effectively simulated the laser cutting process, entailing a good agreement with experimental results regarding temperature distribution and temperature history. These findings represent a fundamental step to investigate the residual stress distribution near the cut surface considering both straight and circular cuts.

关键词： Laser cutting process heat flux FE method online temperature monitoring straight and circular cuts

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