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Keywords: equivalent acoustic method, aluminum alloy extrusion, hybrid FE-SEA method, high speed train.

Summary

The prediction of mid-frequencies of vibro-acoustic systems is always a challenge. Recently, the hybrid FE-SEA method is widely used to predict the car interior and outside noise in the mid-frequency band. Nevertheless, even if hybrid the FE-SEA method has been applied successfully in the automotive field, as a result of the difference of the train structure and the motorcar, this method needs to be further investigated in order to be applied to the railway sector. The whole car body of a high-speed train is a complex structure and the hollow aluminium alloy extrusion of the body frame which is composed of two layers and corrugated rib panels in between is used for high speed trains. If this structure is directly divided into an SEA subsystem, there will be too many thin but long plates, which not only increases the amount of computation but also aggravates the coupling errors of subsystems, therefore a method using the equivalent model of the general laminate to simplify the body profile is proposed in this paper. According to the theory of mode analysis and sound insulation, the equivalent simplification principle follows the same dynamic characteristics and similar sound insulation performance. In this paper, a local model of the carbody floor structure was used to analyse the sound insulation before and after applying the equivalent model as well as the modal frequencies of the first five orders. After comprehensive comparison analysis of the simulated and test results, this equivalent method can be applied to simulate and model the hollow aluminum alloy extrusion profiles. Finally, a hybrid FE-SEA model of whole carbody for a high speed train is established based the features of the high speed train structure, in order to predict interior noise within a frequency range of 100-1000Hz and to further verify the equivalent method for carbody profiles.

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Front Page Browse CCP CSETS CTR IJRT Other Authors Search Purchase Guide FAQ Contact us	Civil-Comp Proceedings ISSN 1759-3433 CCP: 104 PROCEEDINGS OF THE SECOND INTERNATIONAL CONFERENCE ON RAILWAY TECHNOLOGY: RESEARCH, DEVELOPMENT AND MAINTENANCE Edited by: J. Pombo Paper 283 A Study of the Equivalent Acoustic Method for Carbody Profiles of High Speed Trains S.S. Ding, Y.J. Zhao, X.J. Deng, A.Q. Tian, J. Du and S.Q. Liu CSR Qingdao Sifang Locomotive and Rolling Stock Co. Ltd, Qingdao, China doi:10.4203/ccp.104.283 purchase the full-text of this paper Full Bibliographic Reference for this paper S.S. Ding, Y.J. Zhao, X.J. Deng, A.Q. Tian, J. Du, S.Q. Liu, "A Study of the Equivalent Acoustic Method for Carbody Profiles of High Speed Trains", in J. Pombo, (Editor), "Proceedings of the Second International Conference on Railway Technology: Research, Development and Maintenance", Civil-Comp Press, Stirlingshire, UK, Paper 283, 2014. doi:10.4203/ccp.104.283 Keywords: equivalent acoustic method, aluminum alloy extrusion, hybrid FE-SEA method, high speed train. Summary The prediction of mid-frequencies of vibro-acoustic systems is always a challenge. Recently, the hybrid FE-SEA method is widely used to predict the car interior and outside noise in the mid-frequency band. Nevertheless, even if hybrid the FE-SEA method has been applied successfully in the automotive field, as a result of the difference of the train structure and the motorcar, this method needs to be further investigated in order to be applied to the railway sector. The whole car body of a high-speed train is a complex structure and the hollow aluminium alloy extrusion of the body frame which is composed of two layers and corrugated rib panels in between is used for high speed trains. If this structure is directly divided into an SEA subsystem, there will be too many thin but long plates, which not only increases the amount of computation but also aggravates the coupling errors of subsystems, therefore a method using the equivalent model of the general laminate to simplify the body profile is proposed in this paper. According to the theory of mode analysis and sound insulation, the equivalent simplification principle follows the same dynamic characteristics and similar sound insulation performance. In this paper, a local model of the carbody floor structure was used to analyse the sound insulation before and after applying the equivalent model as well as the modal frequencies of the first five orders. After comprehensive comparison analysis of the simulated and test results, this equivalent method can be applied to simulate and model the hollow aluminum alloy extrusion profiles. Finally, a hybrid FE-SEA model of whole carbody for a high speed train is established based the features of the high speed train structure, in order to predict interior noise within a frequency range of 100-1000Hz and to further verify the equivalent method for carbody profiles. purchase the full-text of this paper (price £20) go to the previous paper go to the next paper return to the table of contents return to the book description purchase this book (price £65 +P&P)
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