JPH06219272A - Sound absorbing floor structure for rolling stock - Google Patents

Abstract

(57) [Abstract] [Object] The present invention, when traveling at a high speed, does not impair the speeding up and weight saving of a vehicle, while preventing noises of different frequency ranges from various noise sources that are transmitted from under the floor to the inside of the vehicle.
Another object of the present invention is to provide a sound absorbing floor structure for a railway vehicle that can be easily improved from the conventional vehicle. [Structure] The floorboards of railway cars are formed by hollow floorboards with vertical partitions, and inside the hollows, ultra-lightweight sound absorbing materials that excel in the noise frequency range transmitted from various noise sources under the floor are provided. It is characterized by being enclosed in the area where

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sound absorbing floor structure for railway vehicles, and is for effectively absorbing various noises having different frequency ranges transmitted from under the vehicle floor to the inside of the vehicle without increasing the surface density of the floor board. Used.

[0002]

2. Description of the Related Art In a conventional railway vehicle, the floor structure is [keystone plate] + [floor padding] +
From the structure called "bedding", which has a heavy mass and a high areal density,
[Underframe] + [Floor plate (Al plate + Al honeycomb + Al plate)]
The mass was changed to a structure with a lighter surface density and a lighter vehicle.

[0003]

However, although the conventional changes in the floor structure are suitable for achieving the speedup of railway vehicles, generally, the sound transmission of materials and structures is Since there is a mass law that the heavier the object, the greater the sound-insulating effect is, the sound-insulating effect becomes worse when the weight of the vehicle is reduced as the speed is increased.

Moreover, from the underfloor of a vehicle, rolling noises of wheels and noises of motors and other equipment which become louder at higher speeds are transmitted from different places through a uniform floor structure to the inside of the vehicle. With the speed and weight reduction of vehicles,
In the floor structure of a vehicle, not only the sound insulation effect is significantly deteriorated, but also various noises with different frequency ranges transmitted from under the floor to the inside of the vehicle cannot be uniformly reduced by sound absorption.

The present invention has been made in view of these circumstances, and makes it possible to increase the speed and weight of a vehicle by eliminating noises of different frequency ranges from various noise sources that are transmitted from under the floor to the inside of the vehicle during high-speed traveling. It is an object of the present invention to provide a sound absorbing floor structure for a railway vehicle that can be easily improved from a conventional vehicle without damaging it.

[0006]

The present invention has been made to achieve the above-mentioned object, and is a floor structure formed by a hollow floor plate having vertical partitions. A sound absorbing floor structure for a railway vehicle, characterized in that an ultra-lightweight sound absorbing material excellent in sound absorption in a noise frequency range transmitted from a noise source is enclosed. The sound absorbing material may have a two-layer structure in which a part or all of the sound absorbing material is composed of a powder layer and a porous layer.

[0007]

[Function] In the hollow floor plate with vertical partitions that constitutes the floor plate of the railway vehicle, the noise in the respective frequency ranges generated by the motors and other devices, which are the noise sources under the floor, and the wheels are generated. Since a sound absorbing material suitable for absorbing sound is enclosed, various noises transmitted from under the floor into the vehicle are prevented.

Further, since the floor structure is made of a hollow floor plate, it is only necessary to enclose a sound absorbing substance suitable for those noises in the hollow of the floor plate located above the various noise sources. It's easy. In addition, since the super-lightweight sound absorbing substance suitable for each frequency range generated by each noise source is used for sound absorption, the weight saving of the vehicle which is required as the speed increases is not impaired.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show an embodiment of the present invention. A sound absorbing floor structure for a railway vehicle is mainly composed of a floor portion 1 of the vehicle and an ultralight sound absorbing substance 2.

The floor part 1 of the vehicle includes an underframe 1A made of an aluminum mold material, a floor plate panel (floor plate) 1B in which upper and lower ends of a honeycomb 1a made of aluminum are shielded by plates 1b, 1b made of aluminum, and this floor plate 1B. The floor covering 1C placed on the upper side of the vehicle has a structure suitable for increasing the speed and weight of the railway vehicle.

On the lower side of the floor portion 1, noise sources such as motors, wheels, and pneumatic equipment that emit noise in various frequency ranges are provided at different positions. The rotation noise of the motor, the rolling noise of the wheels, the device noise from the pneumatic equipment and the like emitted from these noise sources are transmitted to the inside of the vehicle through the floor portion 1 above them.

In order to reduce these noises transmitted to the vehicle as much as possible, the super-lightweight sound absorbing substance 2 excellent in absorbing the noise in the frequency range emitted by each noise source corresponds to the area transmitted by each noise source. The plurality of honeycombs 1a are enclosed in the honeycombs 1a.

As the sound absorbing substance 2, glass wool, rock wool, various foamed plastic materials, or powders such as white carkin and talc can be used.
In selecting the sound absorbing substance 2, the primary sound absorption peak of the sound absorbing substance 2 is on the low frequency side or the high frequency side depending on whether the frequency range of the noise to be absorbed is the low frequency range or the high frequency range. You can choose from.

In the above embodiment, in the honeycomb 1a constituting the floor portion 1 of the vehicle, the sound absorbing material 2A suitable for absorbing sound in the high frequency range and the sound absorbing material 2 suitable for absorbing sound in the intermediate frequency range.
Assuming that B and a sound absorbing material 2C suitable for absorbing sound in the low frequency range are enclosed as shown in FIG. 2, the noise in the high frequency range that is about to be transmitted from the underfloor into the vehicle is absorbed by the sound absorbing material 2A, and the noise in the intermediate frequency range is absorbed. The noise is absorbed by the sound absorbing material 2B, and the noise in the low frequency range is absorbed by the sound absorbing material 2C. Therefore, the noise in each frequency range that is about to be transmitted into the vehicle is reasonably absorbed to improve the ride comfort of the vehicle. can do.

Further, since the sound absorbing material 2 enclosed in the aluminum honeycomb 1a is remarkably lighter than the vehicle weight, each frequency range transmitted from under the floor is not impaired without impairing the weight reduction of the vehicle required for speeding up. It is possible to prevent the noise.

Moreover, since the sound absorbing material 2 can be enclosed in the aluminum honeycomb 1a having the conventional floor structure for reducing the weight of the vehicle, it is not necessary to newly develop the floor board 1B. Therefore, the structure of this embodiment can be applied to improve the conventional vehicle.

FIG. 3 shows another embodiment of the present invention. The sound absorbing substance 2 having a two-layer structure in which the ratio of powder and non-powder is changed in part or all of the honeycomb 1a in the above embodiment.
This is the case where D to 2F are enclosed. A porous sound absorbing material is preferably used as the non-powder sound absorbing material.

This structure has two layers of sound absorbing materials 2D to 2D.
The sound absorption characteristic of F is used by shifting the ratio of each component so as to absorb the sound wave in the low frequency range, and the noise in the low frequency range generated under the floor of the vehicle is transmitted to the inside of the vehicle. Can be effectively prevented.
The sound absorbing floor structure of the present invention may be applied to the entire floor structure of a railway vehicle, or may be applied to a part thereof.

[0019]

Since the present invention is configured as described above, it has the following operational effects.

(1) In the sound absorbing floor structure for a railway vehicle according to claim 1, it is excellent in absorbing sound in different noise frequency ranges transmitted from various noise sources under the floor in the hollow space portion constituting the floor plate of the railway vehicle. Since ultra-lightweight sound absorbing substances are enclosed in the respective corresponding ranges, noise from various noise sources with different frequency ranges that are transmitted from the underfloor through the floorboard to the inside of the vehicle will increase the speed and weight of the vehicle. It is possible to effectively absorb the sound without increasing the weight to the extent that it deteriorates the vehicle quality, and to improve the riding comfort of the vehicle.

Moreover, since the sound absorbing substance is enclosed in the hollow space of the floor plate having the same structure as that of the conventional vehicle, the present invention can be applied not only to a new vehicle but also to a conventional vehicle. That is, it has an excellent operational effect.

(2) In the sound absorbing floor structure for a railway vehicle according to claim 2, a part or all of the sound absorbing substance enclosed in the hollow has a two-layer structure of a powder layer and a porous layer. Therefore, it is possible to prevent noise in a frequency range lower than the sound absorption frequency range of each layer from being transmitted from the underfloor into the vehicle.

[Brief description of drawings]

FIG. 1 is a perspective view showing the configuration of an embodiment of the present invention.

FIG. 2 is a plan view showing an example of an array of sound absorbing substances sealed in the hollow.

FIG. 3 is a perspective view showing the configuration of another embodiment of the present invention.

[Explanation of symbols]

 1B Floor board (floor panel) 1a Honeycomb 2,2A-2C Sound absorbing material 2D-2F Two-layer sound absorbing material

Claims (2)

[Claims] 1. A floor structure formed of a hollow floor plate with vertical partitions, in which an ultra-lightweight sound absorbing substance excellent in absorbing noise in a noise frequency range transmitted from various noise sources under the floor is enclosed. A sound absorbing floor structure for railway vehicles. 2. The sound absorbing floor structure for a railway vehicle according to claim 1, wherein a part or all of the sound absorbing substance enclosed in the hollow has a two-layer structure of a powder layer and a porous layer.