scholarly journals Railway Transportation Efficiency Improvement: Loco Health Assessment by Time Domain Data Analysis to Support Condition Based Maintenance Implementation

2015 ◽  
Vol 6 ◽  
pp. 424-433 ◽  
Author(s):  
Marco Capasso ◽  
Stefano Savio ◽  
Pierluigi Firpo ◽  
Gianluca Parisi
Keyword(s):  
Data Analysis ◽  
Time Domain ◽  
Health Assessment ◽  
Condition Based Maintenance ◽  
Efficiency Improvement ◽  
Railway Transportation ◽  
Support Condition ◽  
Time Domain Data

Quantification of metabolites from single-voxelin vivo 1H NMR data of normal human brain by means of time-domain data analysis

1995 ◽  
Vol 3 (3-4) ◽  
pp. 129-136 ◽  
Author(s):  
Mika Ala-Korpela ◽  
Jussi-Pekka Usenius ◽  
Jyrki Keisala ◽  
Aad van den Boogaart ◽  
Pauli Vainio ◽  
...  
Keyword(s):  
Data Analysis ◽  
Human Brain ◽  
1H Nmr ◽  
Time Domain ◽  
Normal Human Brain ◽  
Nmr Data ◽  
Time Domain Data ◽  
Normal Human

scholarly journals Noncontact Sensing of Facial Muscle Activity Using Laser Doppler Vibrometry: Time Domain Data Analysis

2018 ◽  
Vol 1149 ◽  
pp. 012027 ◽  
Author(s):  
S. Casaccia ◽  
E. J. Sirevaag ◽  
M. G. Frank ◽  
J. A. O’Sullivan ◽  
L. Scalise ◽  
...  
Keyword(s):  
Data Analysis ◽  
Time Domain ◽  
Muscle Activity ◽  
Laser Doppler ◽  
Facial Muscle ◽  
Laser Doppler Vibrometry ◽  
Time Domain Data

JOINT INTERPRETATION OF AIRBORNE ELECTROMAGNETIC DATA IN THE TIME DOMAIN AND FREQUENCY DOMAIN

2018 ◽  
Vol 12 (7-8) ◽  
pp. 76-83
Author(s):  
E. V. KARSHAKOV ◽  
J. MOILANEN
Keyword(s):  
Fourier Transform ◽  
Frequency Domain ◽  
Time Domain ◽  
Frequency Interval ◽  
Single Spectrum ◽  
Simultaneous Inversion ◽  
Homogeneous Half Space ◽  
Time Domain Data ◽  
The Time Domain

Тhe advantage of combine processing of frequency domain and time domain data provided by the EQUATOR system is discussed. The heliborne complex has a towed transmitter, and, raised above it on the same cable a towed receiver. The excitation signal contains both pulsed and harmonic components. In fact, there are two independent transmitters operate in the system: one of them is a normal pulsed domain transmitter, with a half-sinusoidal pulse and a small "cut" on the falling edge, and the other one is a classical frequency domain transmitter at several specially selected frequencies. The received signal is first processed to a direct Fourier transform with high Q-factor detection at all significant frequencies. After that, in the spectral region, operations of converting the spectra of two sounding signals to a single spectrum of an ideal transmitter are performed. Than we do an inverse Fourier transform and return to the time domain. The detection of spectral components is done at a frequency band of several Hz, the receiver has the ability to perfectly suppress all sorts of extra-band noise. The detection bandwidth is several dozen times less the frequency interval between the harmonics, it turns out thatto achieve the same measurement quality of ground response without using out-of-band suppression you need several dozen times higher moment of airborne transmitting system. The data obtained from the model of a homogeneous half-space, a two-layered model, and a model of a horizontally layered medium is considered. A time-domain data makes it easier to detect a conductor in a relative insulator at greater depths. The data in the frequency domain gives more detailed information about subsurface. These conclusions are illustrated by the example of processing the survey data of the Republic of Rwanda in 2017. The simultaneous inversion of data in frequency domain and time domain can significantly improve the quality of interpretation.

Monitoring Offshore Pipelines Using Forced Transverse Vibration: Data Analysis

1995 ◽  
Author(s):  
Hugh E. M. Hunt
Keyword(s):  
Fluid Flow ◽  
Data Analysis ◽  
Transverse Vibration ◽  
Vibration Amplitude ◽  
Support Condition ◽  
Offshore Pipelines ◽  
Vibration Data ◽  
Wavelet Methods

Abstract Vibration methods are used to identify faults, such as spanning and loss of cover, in long off-shore pipelines. A pipeline ‘pig’, propelled by fluid flow, generates transverse vibration in the pipeline and the measured vibration amplitude reflects the nature of the support condition. Large quantities of vibration data are collected and analysed by Fourier and wavelet methods.

scholarly journals A Review in Fault Diagnosis and Health Assessment for Railway Traction Drives

2018 ◽  
Vol 8 (12) ◽  
pp. 2475 ◽  
Author(s):  
Fernando Garramiola ◽  
Javier Poza ◽  
Patxi Madina ◽  
Jon del Olmo ◽  
Gaizka Almandoz
Keyword(s):  
Fault Diagnosis ◽  
Health Assessment ◽  
Condition Based Maintenance ◽  
System Availability ◽  
Railway Systems ◽  
Railway Industry ◽  
Railway Traction ◽  
Railway System ◽  
Traction Drives ◽  
Early Fault Detection

During the last decade, due to the increasing importance of reliability and availability, railway industry is making greater use of fault diagnosis approaches for early fault detection, as well as Condition-based maintenance frameworks. Due to the influence of traction drive in the railway system availability, several research works have been focused on Fault Diagnosis for Railway traction drives. Fault diagnosis approaches have been applied to electric machines, sensors and power electronics. Furthermore, Condition-based maintenance framework seems to reduce corrective and Time-based maintenance works in Railway Systems. However, there is not any publication that summarizes all the research works carried out in Fault diagnosis and Condition-based Maintenance frameworks for Railway Traction Drives. Thus, this review presents the development of Health Assessment and Fault Diagnosis in Railway Traction Drives during the last decade.

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