JPS6319641B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vehicle noise suppression device, and particularly to a vehicle noise suppression device suitable for a monorail car running on a single track.

Conventionally, no noise-reducing components have been installed on the underside of the single-track girder on which a rectangular monorail car runs, and measures to reduce vehicle running noise have focused solely on the noise sources such as motors, speed reducers, tires, etc. On the car body side, sound-absorbing treatment is applied, such as surrounding the bogie part, which is the source of the sound, with a skirt. On the other hand, the curve radius of tracks such as urban monorail cars tends to become smaller, and in the case of a rectangular monorail car that is constructed by straddling track girders, the required gap (opening) between the track girder and the skirt needs to be enlarged. become. The above-mentioned sound source or vehicle body side measures have problems such as increased man-hours for maintenance, increased vehicle weight, and increased vehicle price.Furthermore, if the opening size is enlarged, the amount of radiated sound reduction decreases. This problem arises.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a vehicle noise suppression device capable of reducing sound radiation from an opening between a single track girder and a monorail car skirt.

The present invention is characterized by providing a member that operates to reduce the opening area of the opening formed between the single track girder and the lower part of the skirt.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is an explanatory diagram showing noise reduction measures for the opening on the lower surface of the girder and the influence of the noise level on the sound receiving point. At a, the opening 2 has a certain gap and a large opening area commensurate with the curve radius of the track girder 1, and the sound receiving point 5a
becomes high due to the sound radiated from the sound receiving point side opening 2a and the opposite sound receiving point side opening 2a'. b has suction and sound walls 9 on both sides of the lower surface of the track girder 1, and even though the opening 2b on the opposite side of the sound receiving point 5b is the same as 2a, the radiated sound is affected by the wall effect. The sound will be reduced. Symbols c and d are those of the opening area reducing means according to the present invention, and the sound receiving points 5c and 5d are both low in noise.

To explain a specific example, in Fig. 2, 4
1 is a bogie that runs across the track girder 1, and 3 is a skirt with sound absorbing material that surrounds the sound source of these bogies 4. 6 is a cable for communication and power supply, and 7 is a cable rack thereof, and the cable rack 7 is attached to a mounting frame 8 attached to both sides of the lower surface of the track girder 1. Reference numeral 9 denotes a sound absorber or a sound wall, which is a sound absorbing material provided on the sound source side, and is attached to the mounting frame 8 with a hinge 10 or the like, and is normally held at the position shown in the figure, and is connected to a pneumatic or hydraulic actuator as necessary. (not shown)
can be swiveled upwards into the dash-dot position. 11 is a closing plate provided at the bottom of the skirt 3.

In Figure 3, the sound absorber and sound wall 9' installed on the lower surface of the track girder 1 are in a fixed state, and the rotary blocking plate 12 is provided with a sound absorbing material on the sound source side, which is the sound body and the sound absorber on the lower surface of the skirt 3.
is provided with a hinge 13, which is rotated as necessary to make it hang down as shown by the chain line. The opening/closing operation of the rotary closing plate 12 is performed by operating a pneumatic or hydraulic actuator (not shown) which is a pressure source on the vehicle side.

In line sections or specific areas where noise is a problem, such as residential areas along the tracks, hospitals, or schools, it is necessary to reduce running noise. Therefore, the opening area between the track girder 1 and the skirt 3 is reduced by rotating the suction and sound wall 9 or the rotating blocking plate 12 in the above configuration only at these necessary locations, so that the opening area between the track girder 1 and the skirt 3 is reduced. Then return it to its original position.

When the suction or sound wall 9 is turned, the closing effect of the opening 2 can be installed at a point that is not directly related to the movement of the skirt 3 on the vehicle side.
The opening area can be made small, and by providing the closing plate 11 under the skirt 3, the effect of reducing the radiated sound is increased. When the rotary blocking plate 12 is rotated and installed at the position indicated by the chain line in the figure, that is, at an almost vertical position, the air intake on the track girder 1 side and between the sound wall 9' are formed into an approximate sound absorbing duct by using both parts. With this configuration, the radiated sound passing through the duct can be sufficiently reduced, and by providing the closing plate 11 on the side of the suction and sound wall 9', the effect of reducing the radiated sound can be further improved. In addition, the suction and sound walls 9 provided in the track girder 1 can be rotated when necessary to reduce the sound radiated from the opening, thereby preventing a decrease in solar radiation below the track girder 1. This is advantageous in terms of maintenance since dust and the like do not accumulate on the suction or the upper surface of the sound wall 9.
Further, according to the rotary closing plate 12, the opening area of the opening is not reduced except when necessary, so that inspection of the inside of the skirt of the monorail car or various equipment on the track girder 1 can be easily performed.

Note that the suction and sound wall 9 and the rotating closing plate 12
Although the opening area of the opening is reduced by rotating, the present application is not limited to this, and the same effect can be obtained by using a structure that slides or moves up and down.

As explained above, according to the present invention, it is possible to reduce sound radiated from the opening between the single track girder and the skirt of the monorail car.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of radiated sound and sound receiving points when various noise countermeasures are added to a rectangular monorail car, Fig. 2 is a front cross-sectional view of an embodiment of the present invention, and Fig. 3 FIG. 7 is a front sectional view of another embodiment. 1... Track girder, 2... Opening, 3... Skirt, 4...
Dolly, 5... Sound receiving point, 7... Cable rack, 8... Mounting frame, 9... Suction and sound wall, 11... Closing plate, 12... Rotating blocking plate.

Claims (1)

[Claims] 1. Reducing the area of the opening formed between the single track girder and the skirt in at least one of the single track girder and the skirt installed at the bottom of the car body of the monorail car running on the single track girder. A vehicle noise suppression device consisting of a suction and sound body mounted so as to be movable in different directions.