Analysis of the Effect of Frequency Weighting According to the Sperling Index Method on the Dynamic Response of the Railway Vehicle Carbody to Vertical Vibrations
The topic of the paper is part of the research area in which the methods of ride comfort evaluation are investigated, to identify their advantages and limitations, the correlation of the comfort indices obtained by different methods, and even the improvement of these methods as an application method...
Saved in:
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2025-01-01
|
| Series: | Applied Sciences |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2076-3417/15/2/507 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1832589247024988160 |
|---|---|
| author | Ioana Izabela Apostol Mădălina Dumitriu Traian Mazilu |
| author_facet | Ioana Izabela Apostol Mădălina Dumitriu Traian Mazilu |
| author_sort | Ioana Izabela Apostol |
| collection | DOAJ |
| description | The topic of the paper is part of the research area in which the methods of ride comfort evaluation are investigated, to identify their advantages and limitations, the correlation of the comfort indices obtained by different methods, and even the improvement of these methods as an application methodology or as an interpretation. In this paper, the Sperling index method is analyzed from a new perspective, specifically, the effect that the frequency weighting functions specific to this method have on the dynamic response of the railway vehicle carbody, as evaluated by the power spectral density (PSD) of the acceleration. The analysis is based on numerical simulation results for three different cases: respectively, the unweighted PSD of the acceleration, the frequency-weighted PSD of the acceleration with the function for the evaluation of ride quality (RQ)and the weighting function for the evaluation of ride comfort (RC). The applications for the numerical simulation are based on an original vehicle–track system model with 15 degrees of freedom, which includes a rigid–flexible coupled model of the vehicle and the equivalent model of the track. This model considers important elements that can influence the vertical vibration behavior of the carbody, namely, the carbody structural flexibility, which is represented by an equivalent Euler–Bernoulli beam, the system through which the longitudinal forces are transmitted from the bogies to the carbody, and the elasticity of the wheel–rail contact. Based on the analyses developed in the paper, the relevant conclusions regarding the effect of the frequency weighting functions specific to the Sperling index method on the dominant vertical vibration modes of the carbody are synthesized. These conclusions are correlated with the results of the Wz index for the RQ evaluation and the RC evaluation. |
| format | Article |
| id | doaj-art-3208aa0079b946ccab732b5deeca2187 |
| institution | Kabale University |
| issn | 2076-3417 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj-art-3208aa0079b946ccab732b5deeca21872025-01-24T13:19:37ZengMDPI AGApplied Sciences2076-34172025-01-0115250710.3390/app15020507Analysis of the Effect of Frequency Weighting According to the Sperling Index Method on the Dynamic Response of the Railway Vehicle Carbody to Vertical VibrationsIoana Izabela Apostol0Mădălina Dumitriu1Traian Mazilu2Department of Railway Vehicles, National University of Science and Technology Politehnica Bucharest, 060042 Bucharest, RomaniaDepartment of Railway Vehicles, National University of Science and Technology Politehnica Bucharest, 060042 Bucharest, RomaniaDepartment of Railway Vehicles, National University of Science and Technology Politehnica Bucharest, 060042 Bucharest, RomaniaThe topic of the paper is part of the research area in which the methods of ride comfort evaluation are investigated, to identify their advantages and limitations, the correlation of the comfort indices obtained by different methods, and even the improvement of these methods as an application methodology or as an interpretation. In this paper, the Sperling index method is analyzed from a new perspective, specifically, the effect that the frequency weighting functions specific to this method have on the dynamic response of the railway vehicle carbody, as evaluated by the power spectral density (PSD) of the acceleration. The analysis is based on numerical simulation results for three different cases: respectively, the unweighted PSD of the acceleration, the frequency-weighted PSD of the acceleration with the function for the evaluation of ride quality (RQ)and the weighting function for the evaluation of ride comfort (RC). The applications for the numerical simulation are based on an original vehicle–track system model with 15 degrees of freedom, which includes a rigid–flexible coupled model of the vehicle and the equivalent model of the track. This model considers important elements that can influence the vertical vibration behavior of the carbody, namely, the carbody structural flexibility, which is represented by an equivalent Euler–Bernoulli beam, the system through which the longitudinal forces are transmitted from the bogies to the carbody, and the elasticity of the wheel–rail contact. Based on the analyses developed in the paper, the relevant conclusions regarding the effect of the frequency weighting functions specific to the Sperling index method on the dominant vertical vibration modes of the carbody are synthesized. These conclusions are correlated with the results of the Wz index for the RQ evaluation and the RC evaluation.https://www.mdpi.com/2076-3417/15/2/507railway vehicleSperling index methodfrequency weighting functionsride comfortride qualityvertical vibration |
| spellingShingle | Ioana Izabela Apostol Mădălina Dumitriu Traian Mazilu Analysis of the Effect of Frequency Weighting According to the Sperling Index Method on the Dynamic Response of the Railway Vehicle Carbody to Vertical Vibrations Applied Sciences railway vehicle Sperling index method frequency weighting functions ride comfort ride quality vertical vibration |
| title | Analysis of the Effect of Frequency Weighting According to the Sperling Index Method on the Dynamic Response of the Railway Vehicle Carbody to Vertical Vibrations |
| title_full | Analysis of the Effect of Frequency Weighting According to the Sperling Index Method on the Dynamic Response of the Railway Vehicle Carbody to Vertical Vibrations |
| title_fullStr | Analysis of the Effect of Frequency Weighting According to the Sperling Index Method on the Dynamic Response of the Railway Vehicle Carbody to Vertical Vibrations |
| title_full_unstemmed | Analysis of the Effect of Frequency Weighting According to the Sperling Index Method on the Dynamic Response of the Railway Vehicle Carbody to Vertical Vibrations |
| title_short | Analysis of the Effect of Frequency Weighting According to the Sperling Index Method on the Dynamic Response of the Railway Vehicle Carbody to Vertical Vibrations |
| title_sort | analysis of the effect of frequency weighting according to the sperling index method on the dynamic response of the railway vehicle carbody to vertical vibrations |
| topic | railway vehicle Sperling index method frequency weighting functions ride comfort ride quality vertical vibration |
| url | https://www.mdpi.com/2076-3417/15/2/507 |
| work_keys_str_mv | AT ioanaizabelaapostol analysisoftheeffectoffrequencyweightingaccordingtothesperlingindexmethodonthedynamicresponseoftherailwayvehiclecarbodytoverticalvibrations AT madalinadumitriu analysisoftheeffectoffrequencyweightingaccordingtothesperlingindexmethodonthedynamicresponseoftherailwayvehiclecarbodytoverticalvibrations AT traianmazilu analysisoftheeffectoffrequencyweightingaccordingtothesperlingindexmethodonthedynamicresponseoftherailwayvehiclecarbodytoverticalvibrations |