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WHEEL-RAIL NOISE REDUCTION OF RAIL RAPID TRANSIT

Susumu Satô, Hironori Matsuhisa

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Abstract

Characteristics of noise and vibration of a wheel are discussed based on experimental and theoretical studies. The noise is caused mainly by transverse vibration of the wheel, and the vibration level is influenced by the condition of rail contact. Vibration can be theoretically derived by a differential equation including shear deformation and rotatory inertia terms for a circular plate with stepped thickness, with the following boundary conditions; the inside circumference is fixed, the outside is free and one point on it is simply supported. Noise can be reduced by decreasing the vibration and the sound radiating area of the wheel. For example, a spoke type wheel which properly contacts with a rail has 8-10 dB lower noise than a web type wheel.

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What this paper is about

Characteristics of noise and vibration of a wheel are discussed based on experimental and theoretical studies. The noise is caused mainly by transverse vibration of the wheel, and the vibration level is influenced by the condition of rail contact. Vibration can be theoretically derived by a differential equation including shear deformation and rotatory inertia terms for a circular plate with stepped thickness, with the following boundary conditions; the inside circumference is fixed, the outside is free and one point on it is simply supported. Noise can be reduced by decreasing the vibration and the sound radiating area of the wheel. For example, a spoke type wheel which properly contacts with a rail has 8-10 dB lower noise than a web type wheel.

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Available abstract

Characteristics of noise and vibration of a wheel are discussed based on experimental and theoretical studies. The noise is caused mainly by transverse vibration of the wheel, and the vibration level is influenced by the condition of rail contact. Vibration can be theoretically derived by a differential equation including shear deformation and rotatory inertia terms for a circular plate with stepped thickness, with the following boundary conditions; the inside circumference is fixed, the outside is free and one point on it is simply supported. Noise can be reduced by decreasing the vibration and the sound radiating area of the wheel. For example, a spoke type wheel which properly contacts with a rail has 8-10 dB lower noise than a web type wheel.

Key concepts: Vibration, Noise (video), Acoustics, Inertia, Curvature, Noise reduction, Structural engineering, Noise control

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