TY - CHAP

T1 - A Wavelet Packet Algorithm for Online Detection of Pantograph Vibrations

AU - Mercorelli, Paolo

AU - Rode, Manfred

AU - Terwiesch, Peter

N1 - Conference code: 9

PY - 2000/6/1

Y1 - 2000/6/1

N2 - Online detection and classification of changing harmonic signal content is a common issue in vehicle control, both regarding mechanical and electrical oscillations. The present paper develops a fast and numerically efficient algorithm that uses wavelet packets to detect, in real time operation, dominant oscillations as they occur in active pantograph control for electrical rail vehicles. The dominant oscillations in the investigated application are strongly time-variant, as they are influenced by train speed, catenary and rail system construction parameters, and other external factors such as wind. The paper introduces a transient indicating ratio testing in wavelet domain which defines a distance measure between two consecutive measured signals. The defined distance illuminates the difference between two signals in time-frequency domain in order to recognize when and where a transient occurs. The effectiveness of the algorithm is demonstrated in an open-loop manner on actual measured pantograph data.

AB - Online detection and classification of changing harmonic signal content is a common issue in vehicle control, both regarding mechanical and electrical oscillations. The present paper develops a fast and numerically efficient algorithm that uses wavelet packets to detect, in real time operation, dominant oscillations as they occur in active pantograph control for electrical rail vehicles. The dominant oscillations in the investigated application are strongly time-variant, as they are influenced by train speed, catenary and rail system construction parameters, and other external factors such as wind. The paper introduces a transient indicating ratio testing in wavelet domain which defines a distance measure between two consecutive measured signals. The defined distance illuminates the difference between two signals in time-frequency domain in order to recognize when and where a transient occurs. The effectiveness of the algorithm is demonstrated in an open-loop manner on actual measured pantograph data.

KW - Engineering

KW - Harmonic analysis

KW - transient signals

KW - distance transformations

KW - transportation control

KW - train control

U2 - 10.1016/S1474-6670(17)38152-1

DO - 10.1016/S1474-6670(17)38152-1

M3 - Article in conference proceedings

VL - 1

T3 - IFAC Proceedings

SP - 235

EP - 240

BT - Proceedings of the 9th IFAC Control in Transportation Systems 2000

A2 - Schnieder , E.

A2 - Becker, U.

PB - Pergamon Press

T2 - 9th IFAC Transportation Systems International Conference 2000

Y2 - 13 June 2000 through 15 June 2000

ER -