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Simulation of wheel and rail profile wear:a review of numerical models

Railway Engineering Science 2022年第4期30卷 403-436页

作者： N.Bosso M.Magelli N.Zampieri Department of Mechanical and Aerospace Engineering Politecnico Di TorinoC.so Duca degli Abruzzi 2410129 TurinItaly

The development of numerical models able to compute the wheel and rail profile wear is essential to improve the scheduling of maintenance operations required to restore the original profile *** work surveys the main numerical models in the literature for the evaluation of the uniform wear of wheel and rail *** standard structure of these tools includes a multibody simulation of the wheel-track coupled dynamics and a wear module implementing an experimental wear ***,the models are classified according to the strategy adopted for the worn profile update,ranging from models performing a single computation to models based on an online communication between the dynamic and wear ***,the most common strategy nowadays relies on an iteration of dynamic simulations in which the profiles are left unchanged,with co-simulation techniques often adopted to increase the computational *** is still needed to improve the accuracy of the current *** experimental campaigns should be carried out to obtain refined wear coefficients and models,while strategies for the evaluation of both longitudinal and transversal wear,also considering the effects of tread braking,should be implemented to obtain accurate damage models.

关键词： Wear Wheel and rail profiles Wheel-rail contact Railway vehicle dynamics Multibody simulation Co-simulation

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Sustainable regional development through knowledge networks:Review of case studies

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Frontiers of Architectural Research 2019年第4期8卷 471-482页

作者： Abdol Aziz Shahraki School of Architecture and the Built Environment Royal Institute of TechnologyKTHStockholmSweden

This study focuses on the importance of knowledge management in the process of *** goal is to build a regional knowledge network for regional sustainable *** method used in this study stands on two theoretical and experimental *** study also provides feasible outcomes by suggesting a model for knowledge-based *** model assists regional/urban planners in managing knowledge productions,organizing regional knowledge institutions,and developing cities by utilizing the advantages of the *** of this applied research support the creation of knowledge networks in similar cities.

关键词： Sustainable urban development Knowledge workers Knowledge networks Urban planning Urban infrastructure

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Towards a standardisation for digital inputs and outputs of protection functions in IEC 60255 series

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Protection and Control of Modern Power Systems 2022年第1期7卷 382-392页

作者： Volker Leitloff hao Chen Dehui Chen Andrea Bonetti Lei Xu Ahmed Mohamed Carl Byman French Transmission Network Operator Rte ParisFrance State Grid Jiangsu Electric Power Co. Ltd.NanjingChina State Grid Electric Power Institute NanjingChina Royal Institute of Technology StockholmSweden NR Elec-tric Co. Ltd.NanjingChina Scottish and Southern Energy Network(SSEN) GlasgowUK hitachi Energy VästeråsSweden.

Fully digitalized substations using IEC 61850 process bus are being introduced all over the *** utilities have featured pilot projects,demonstrators or even industrial scale deployment of these Fully Digital Protection,Auto-mation and Control Systems(FD-PACS).Product standards such as profiles for Instrument Transformers have been developed and published(IEC 61869-6 and IEC 61869-9 by TC 38-Instrument Transformers).This raises the question about the standards for digitally interfaced protection *** 2016,IEC TC 95(Measuring relays and protection equipment)charged a working group to investigate this subject and to elaborate recommendations concerning requirements and testing of protection IED with digital inputs and outputs for protection standards(IEC 60255-1xx series).For protection functions,publisher/subscriber based data streams are supposed to comply with IEC 61850 and IEC 61869 *** holds in particular for Sampled Values(SV)representing energising inputs of the protection function,and is also applicable to Generic Object Oriented Substation Event(GOOSE)which can be used for input or output of protection *** attributes of published data depend on the operational and connection status of the function and the hosting *** addition,protection functions have to take into account the information regarding the time synchronisation of the received SV and other *** paper gives an overview of these features and the proposed way to take them into account in the IEC 60255 standard *** describes the progress of WG 2 and relates it to existing standardization documents.

关键词： Process bus Protection function Digital interface SAMU LPIT Standards IEC 61850

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