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Evaluation methods for rail transit projects [PDF]

open access: greenTransportation Research Part A: General, 1989
The demand for rail transit funds greatly exceeds available monies. Worse, there is widespread disagreement over the wisdom of building rail systems in American cities. The Urban Mass Transportation Administration's (UMTA's) transit analysis methods have relied on cost-effectiveness measures with little attention devoted to the analysis of economic ...
Johnston, Robert A., DeLuchi, Mark A.
openaire   +4 more sources

Fault Diagnosis of Axle Box Bearing with Acoustic Signal Based on Chirplet Transform and Support Vector Machine

open access: yesShock and Vibration, 2022
Acoustic fault diagnosis technology equipment is non-contact, and the acoustic signal is easy to access. However, it is difficult to extract the feature information of the acoustic signal with low signal-to-noise ratio (SNR).
Jimin Zhang   +3 more
doaj   +1 more source

Estimation of Critical Safety Thickness of the Base against Confined Water Inrush for a Rectangular Foundation Pit

open access: yesAdvances in Civil Engineering, 2022
Affected by confined aquifer, basal inrush accidents caused by excavation are common in foundation pits, and accurate estimation of the safety thickness of the base is a big concern of engineers.
Qin-xing Li   +5 more
doaj   +1 more source

Analysis of Tire-Pavement Contact Morphology Characteristics during the Virtual Track Train Maneuvering

open access: yesAdvances in Civil Engineering, 2022
The tire-pavement contact morphology during the virtual track train maneuvering has an essential function in assessing vehicle performance and pavement damage.
Chengping Wang, Jimin Zhang, Hechao Zhou
doaj   +1 more source

Nonlinear Vibration Feature Recognition Method for Reciprocating Compressor Cylinder Based on VMD-Multifractal Spectrum

open access: yesShock and Vibration, 2023
The failure probability of piston ring abrasion occupies the forefront in reciprocating compressor cylinder assembly. Due to the reciprocating friction between the piston ring and cylinder liner, the local vibration signal contains typical nonstationary ...
Fengxia Lyu   +5 more
doaj   +1 more source

Analysis of Smart Grid Optimal Scheduling considering the Demand Response of Different EV Owners

open access: yesInternational Transactions on Electrical Energy Systems, 2023
The escalating growth of electric vehicle (EV) load has emphasized the growing importance of effective scheduling strategies. Due to the discrepancies among EV owners, their responses to scheduling can differ significantly.
Xiaohua Zhang   +5 more
doaj   +1 more source

Research on Wheel-Rail Local Impact Identification Based on Axle Box Acceleration

open access: yesShock and Vibration, 2022
Abnormal vibration signals of tramcar are mostly nonstationary and nonlinear signals. This study applied the Hilbert–Huang transform (HHT) to analyze abnormal vibration of the tramcar, aiming to overcome the limitations of some traditional time-frequency
Yuanjin Ji, Junwei Zeng, Wenjing Sun
doaj   +1 more source

An Integrated Model of Atom Search Optimization-Based Resonance Sparse Signal Decomposition and Cross-Validation SVM for Gearbox Fault Diagnosis

open access: yesShock and Vibration, 2022
In the aspect of gearbox fault diagnosis, the periodic pulse signal containing fault characteristics is often overwhelmed with other strong interference components, which brings a great challenge for gearbox fault detection and status identification.
Fengfeng Bie   +4 more
doaj   +1 more source

Experimental study on thermodynamic characteristics of EPS lightweight soil [PDF]

open access: yesE3S Web of Conferences, 2020
The dynamic triaxial tests of EPS light soil were carried out under the conditions of different temperature, dynamic stress, EPS mixing ratio, cement content and age period, and the effect of temperature on the dynamic properties of EPS light soil is ...
Ruidong LUO   +4 more
doaj   +1 more source

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