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Acoustic device for track

A technology for sound-absorbing devices and rails, which is applied in the direction of rails, noise-absorbing devices, roads, etc., can solve problems such as difficulties, and achieve the effects of increasing maintainability and durability, reducing noise, and high impact resistance

Inactive Publication Date: 2002-09-11
NAT TRAFFIC SAFETY & ENVIRONMENT LAB +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, with conventional sound absorbers for rails, it is difficult to use the optimum sound absorber according to the angle at which the noise comes, because the sound absorber cannot be deformed into an arbitrary curved shape

Method used

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  • Acoustic device for track
  • Acoustic device for track
  • Acoustic device for track

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0023] figure 1 is a side view of a sound absorbing device for rails according to one embodiment. A composite ceramic sound-absorbing panel is used as the sound-absorbing panel in which an aluminum-based ceramic material and an aluminum expanded metal are bonded to each other.

[0024] This embodiment provides a sound-absorbing device, in which a grid 2 is processed, and the thickness of the air layer between the base 5 and the composite ceramic sound-absorbing panel 1 can be controlled. A composite ceramic sound-absorbing panel 1 is installed between the two rails 3 and is supported by a support member 9 and a C-shaped channel steel 6 . The support 9 and the C-shaped channel steel 6 are supported by the base 5 machined below these elements, while the base 5 itself is fixed by different means. For example, the base 5 can be fixed to the sleeper 4 by screwing in nails, or it can also be fixed in the concrete state by anchors in the holes. Of course, it can also be figure 1 ...

no. 2 example

[0030] figure 2 is a sectional view of the sound absorbing device for rails according to the second embodiment. In addition to the structure shown in the first embodiment, this embodiment provides a sound-absorbing device in which both ends of the composite ceramic sound-absorbing panel 1 near the two steel rails 3 are bent at approximately 90 degrees until they are aligned with the The top surfaces of the two rails are perpendicular, thereby forming a curved portion. Since the composite ceramic sound-absorbing panel 1 adopted in the present invention has proper elasticity, it can be bent and used. In this embodiment, by utilizing most of the above-mentioned characteristics of the panel 1 , the composite ceramic sound-absorbing panel 1 is supported by the sound-absorbing panel support 10 , while the middle part of the panel 1 is fixed by the C-shaped channel steel 6 and the bolt 7 .

[0031] The composite ceramic sound-absorbing panel 1 has different sound-absorbing effects...

no. 3 example

[0033] image 3 is a sectional view of the sound absorbing device for rails according to the third embodiment. In addition to the structure shown in the first embodiment, this embodiment provides a sound absorbing device in which two composite ceramic sound absorbing panels 1 are arranged in parallel so as to be perpendicular to the echo from the bottom of the vehicle. Specifically, in this sound-absorbing device, the two ends of each of the two composite ceramic sound-absorbing panels installed close to each of the two steel rails 3 are bent at approximately 90 degrees until they are aligned with the rails. The top surface is perpendicular to have a curved portion.

[0034] In this embodiment, the two ends of each composite ceramic sound-absorbing panel 1 are fixed by the sound-absorbing panel support 10, and the middle part thereof is not supported. Therefore, each acoustic panel has a bow shape across its entire width. Although in this embodiment two composite ceramic so...

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Abstract

A sound-absorbing device for a track, which reduces noise generated from a part below a vehicle floor, among noises generated by a track, characterized in that a thin sound-absorbing panel with high impact strength is installed on the track near a noise source on or near the track. Here we offer sound absorbing devices for rails that not only have good sound absorbing effects, but also have durability such as impact resistance.

Description

field of invention [0001] The present invention relates to a track-use sound-absorbing device for railways, monorail railways, etc., and more particularly to a track-use sound-absorbing device in which a thin sound-absorbing panel with high impact strength is processed, which is made of ceramic material or the like . Background of the invention [0002] Among noises generated by railways, noises under the vehicle floor such as rolling noise generated when wheels roll on the rails, motor fan noise generated by fans used to cool the main motor, and inverters and rectifiers used for control Vehicle equipment noise is considered to be a cause of noise pollution along railway lines. In particular, concrete subgrade tracks have recently come into use in railways from the viewpoint of being free from maintenance. The need for noise reduction is more pressing for concrete-based tracks than for traditional ballast-based tracks, because such concrete-based tracks are fully reflectiv...

Claims

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Application Information

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IPC IPC(8): E01F8/00C04B41/88E01B2/00E01B19/00
CPCE01B19/003E01B2/00
Inventor 绪方正刚长谷崎和洋本村光柴田精三川见雅幸关四郎
Owner NAT TRAFFIC SAFETY & ENVIRONMENT LAB
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