Browsing by Author "Hou, Bowen"
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- Validated slab track models for railway vehicle dynamicsPublication . Thölken, Denise; Hou, Bowen; Esen, Ahmet; Marolt, Tina; Pombo, João; Meacc, Martina; Shi, Zhiyong; Meli, Enrico; Rindi, Andrea; Abdalla Filho, João Elias; Laghrouche, Omar; Woodward, PeterModern society demands and environmental factors are putting pressure in the development of new high speed rail networks or on the upgrade of conventional tracks to allow a significant increase in operational speeds and/or load capacity. Such requirements raise scientific and technological challenges that need to be addressed, which include the improvement of numerical tools and experimental techniques to support the design solutions. The dynamic analysis of railway systems involves multidisciplinary problems for which the most recente computer codes for rail applications only allow the study of a particular phenomenon at a time, each with its own mathematical model. By analysing such phenomena independently, it is not possible to capture all the dynamics of the complete railway system and the relevant coupling effects.
- Vibration reduction in ballasted track using ballast mat: Nnmerical and experimental evaluation by wheelset drop testPublication . Hou, Bowen; Wang, Di; Wang, Bingbing; Chen, Xingyu; Pombo, JoãoBallast mats are considered as an effective solution for reducing vehicle-induced vibrations. However, the research on the vibration characteristics of each part of the ballasted track with a ballast mat is limited. In this study, the ballast mat vibration reduction effects are evaluated by numerical and experimental analysis using wheelset drop tests. A three-dimensional model consisting of a wheel, track and the contact between them is built using a rigid–flexible coupling method. The accuracy of the numerical model is verified by comparison with the finite element model in terms of the track receptance and phase angle. Comparisons show that the proposed model is in good agreement with the finite element model, which allows validating the flexible-body model. Moreover, the track dynamic performance in the presence and absence of the ballast mat is studied with the wheelset drop tests in both time and frequency domains. The results from the wheelset drop excitation tests show that the use of the ballast mat decreases the mid- and high-frequency track vibration by 13–17 dB but increases the low-frequency track vibration by 5–15 dB.