CURVE SQUEAL OF TRAIN WHEELS, PART 3: ACTIVE CONTROL

✍ Scribed by MARIA A. HECKL; X.Y. HUANG

• Publisher: Elsevier Science
• Year: 2000
• Tongue: English
• Weight: 313 KB
• Volume: 229
• Category: Article
• ISSN: 0022-460X
• DOI: 10.1006/jsvi.1999.2512

✦ Synopsis

This paper presents a new method to annul the squeal noise that is produced by trains traversing a curve. The method is a special form of active control, applied to suppress the bending oscillations of a squealing wheel. It is essentially a feedback system with the following components: sensor, narrowband "lter, phase-shifter, ampli"er and actuator. The control signal driving the actuator has only a single frequency (set at the "lter), and that frequency typically corresponds to one of the bending modes of the wheel. Two versions of the feedback system are considered. In the "rst version, the actuator exerts a control force on the wheel, and in the second version, the actuator imposes a velocity on the rail. A mathematical model is presented and predictions are made for the performance of both versions. The coupling of the di!erent wheel modes by the control system is discussed. A model rig is described which was used for a practical demonstration of this form of active control. Di!erences from more conventional forms of active control are pointed out.