Results 251 to 260 of about 15,657 (289)
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Engineering Structures, 2021
Abstract A theory is presented for retrieving the track/bridge frequencies and track modulus from an instrumented vehicle moving over a dual-beam model to simulate the track-bridge system. The dual beams are connected by uniform spring-dashpot units to simulate the effects of sleepers and ballast, etc.
Yeong-Bin Yang, K Shi, Hao Xu
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Abstract A theory is presented for retrieving the track/bridge frequencies and track modulus from an instrumented vehicle moving over a dual-beam model to simulate the track-bridge system. The dual beams are connected by uniform spring-dashpot units to simulate the effects of sleepers and ballast, etc.
Yeong-Bin Yang, K Shi, Hao Xu
exaly +2 more sources
Track Modulus Analysis of Railway Track System Using Finite Element Model
JVC/Journal of Vibration and Control, 2010With the development of ever faster trains, the problem of excessive ground vibrations has increased. Dealing with ground vibration from surface and underground trains is a challenging issue for the railway industry. In the present work, the analysis of a typical Indian railway track system has been done with special emphasis on “track modulus” for ...
K Ganesh Babu, C Sujatha
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Railroad track modulus estimation using ground penetrating radar measurements
NDT and E International, 2004Track defects and failures resulting from weak strength and buckling cause many of the railroad accidents. One parameter that greatly affects track performance and safety is the track vertical modulus, which is a measure of the vertical stiffness of the rail foundation.
Ram M Narayanan, Dingqing Li
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Journal of Civil Structural Health Monitoring, 2017
This paper presents a new methodology to quantify the vertical bending moments that generate in rail under the passage of train wheels. In this method, the rail-bending moments are quantified from track modulus estimated using train-mounted vertical track deflection (VTD) measurements. This provides a practical approach for quantifying the rail-bending
Mustafa Gul +2 more
exaly +2 more sources
This paper presents a new methodology to quantify the vertical bending moments that generate in rail under the passage of train wheels. In this method, the rail-bending moments are quantified from track modulus estimated using train-mounted vertical track deflection (VTD) measurements. This provides a practical approach for quantifying the rail-bending
Mustafa Gul +2 more
exaly +2 more sources
Modulus of elasticity of non-ballasted track
BRIСS Transport, 2023The main stiffness properties that determine the stresses in the track structure components under loads from a moving train are the modulus of elasticity of the rail slab and the slab-track/rail correlation stiffness coefficient. These parameters have been investigated for a ballasted track and are well established today, in contrast to those of a non ...
K. I. Ivanova, A. F. Kolos, X. Wang
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Tracking analysis of the constant modulus algorithm
2008 IEEE International Conference on Acoustics, Speech and Signal Processing, 2008Recently, we proposed a model for the steady-state estimation error of real-valued constant-modulus-based algorithms as a function of the a priori error and of a term that measures the variability in the modulus of the transmitted signal. In this paper, we extend this model to complex-valued data and use it in conjunction with the feedback analysis ...
Magno T. M. Silva, Vítor H. Nascimento
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Track modulus detection by vehicle scanning method
Acta Mechanica, 2020An effective technique is proposed for identifying the track modulus, i.e., the foundation stiffness of the rails, using the contact-point response of the moving test vehicle. First, for a simple beam resting on an elastic foundation under a moving sprung mass, closed-form solutions are derived for the responses of the vehicle and its contact point ...
Y. B. Yang +3 more
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Tracking Performance of Two Constant Modulus Equalizers
IEEE Communications Letters, 2013Exploiting the error variance relation, this letter discusses the evaluation of excess mean square error (EMSE) of constant modulus equalizers in a noise-free non-stationary environment. The EMSE analyses are presented for two equalizers - the CMA22 and the βCMA.
Shafayat Abrar +3 more
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Misadjustment and tracking analysis of the constant modulus array
IEEE Transactions on Signal Processing, 1998The constant modulus (CM) array is a blind adaptive beamformer that can separate cochannel signals. A follow-on adaptive signal canceler may be used to perform direction finding of the source captured by the array. In this paper, we analyze the convergence and tracking properties of the CM array using a least-mean-square approximation.
Arvind V. Keerthi +2 more
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