Sound-absorbing method and sound-absorbing device for magnetic levitation traffic line

Abstract

The invention discloses a sound-absorbing method for a magnetic levitation traffic line. Sound-absorbing devices are arranged on the lower-middle part of a track beam, and a plurality of sound-absorbing devices are arranged on the whole track beam one by one. During installation, the sound-absorbing devices are connected with the track beam through expansion bolts, and damping rubber gaskets are arranged between the sound-absorbing devices and the track beam. The sound-absorbing devices comprise cavity frameworks, sound-absorbing plates and facing plates, wherein the sound-absorbing plates are arranged on the upper parts of the cavity frameworks; the facing plates are connected to the outer side faces of the sound-absorbing plates. According to different shapes and structures of the cavity frameworks, the sound-absorbing devices comprise triangular sound-absorbing devices and L-shaped sound-absorbing devices. In the sound-absorbing devices, the sound-absorbing plates are made of a light porous metal material, so that the functions of ventilating and reducing pressure are realized while sound energy reflection is reduced according to the principles of resistive sound absorption and throttling-expansion-depressurization.

Description

technical field [0001] The invention relates to noise control, in particular to a sound-absorbing method and a sound-absorbing device for a maglev traffic line. Background technique [0002] Aerodynamic noise is one of the main noise sources generated by high-speed maglev trains. In the case of high-speed operation, aerodynamic noise mainly includes high-speed airflow noise (referred to as car-rail airflow noise) generated by air extrusion between the bottom of the train car and the track (floating gap), and maglev car shell Turbulent noise generated at high speeds. Among them, high-speed airflow noise is the main sound source. Studies have shown that the energy of turbulent noise generated on the surface of the car body only accounts for about 1 / 10 to 1 / 6 of the total energy (depending on the speed). [0003] At present, other countries in the world, such as the United Kingdom, North America, the Netherlands, and the Gulf region, are conducting research on the developmen...

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Problems solved by technology

[0003] At present, other countries in the world, such as the United Kingdom, North America, the Netherlands, and the Gulf region, are conducting research on the development and application of maglev technology, but there is little research on the control of high-speed maglev noise by track beam surface treatment

The known research is that in December 2003, German experts had conducted a noise reduction test on beams covered with polyester sound-absorbing materials, but the noise reduction mechanism of sound-absorbing materials, the location of sound sources, and the reasonable location of pasting No systematic and in-depth research has been carried out on area, life, safety, etc., so an effective maglev noise reduction technology has not been formed, and satisfactory results have not been obtained in the end.

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