Abstract
This paper presents the modelling and design of a constrained layer damper to eliminate squeal noise in a particular tram. Even though resilient wheels are installed in every bogie, squeal noise is generated at the frequency of 780–800 Hz due to the small radius curves that the tram has to draw. Tuned constrained layer dampers provide a solution to this particular problem. Butyl rubber is chosen as the viscoelastic material for the damper, and conventional steel is used for the metallic sheets. The modelling approach and the final design of the damper are presented, together with evaluation of its performance in a real application. Experimental measurements on track have demonstrated that the constrained layer damper is properly tuned to the squealing frequency and that there is a significant reduction in noise when the proposed damper is attached to the wheels.
Highlights
Introduction to the ProblemThe most important and valued advantages of the tram are that it is ecological and sustainable; it coexists in a healthy way with the city and environment
This paper presents the modelling and design of a constrained layer damper to eliminate squeal noise in a particular tram
Even though resilient wheels are installed in every bogie, squeal noise is generated at the frequency of 780–800 Hz due to the small radius curves that the tram has to draw
Summary
The most important and valued advantages of the tram are that it is ecological and sustainable; it coexists in a healthy way with the city and environment. This concept of health refers to the acoustics, oftentimes one of the most criticized aspects of wheeled vehicles. Curves and routes cannot be designed and instead they have to be shaped to what the city allows. Resilient wheels are very often used in tram systems because these wheels tend to dissipate vibrations better and generate lower noise levels. Resilient wheels can suffer of squealing noise [21]
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