JPH062302A - Impulsive sound damping equipment of rails of railroad and its sound damping method - Google Patents

Abstract

PURPOSE:To reduce fluctuation of impulsive sounds at welded joints of rails when wheels run on rails at a high speed. CONSTITUTION:The device consists of 2 pieces of rails 5 on which wheels 2 run, sleepers 4 which fix the rails 5 on roadbed 3 and bear them, an impulsive sound damping device 10 which is installed between both ends of welded joints 9 that are located above the sleeper 4 and either the roadbed 3 or the sleeper 4, a control which regulates damping effect of the impulsive sound damping device 10 corresponding to the changes of atmospheric temperatures, a temperature sensor 19 which detects atmospheric temperature, and a solar cell panel 8 which supplies electric power to the above devices. Damping effect of the impulsive sound damping device 10 is increased when the atmospheric temperature rises, and its damping effect is reduced when the temperature falls.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention reduces the impact noise in the vertical direction at a rail seam weld when a railroad vehicle travels on rails at high speed via wheels, and also performs track maintenance work. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for mitigating impact noise of railway rails.

[0002]

2. Description of the Related Art In railway vehicles, it is a duty to transport a large number of passengers quickly and safely. In particular, it is becoming increasingly necessary for Shinkansen and high-speed vehicles to operate at higher speeds.

However, along with this, problems associated with noise and vibration have been pointed out along the railroad tracks along which vehicles run.
The main one is the impact noise in the high frequency region of the wheel at the rail seam weld, and measures are taken by installing a soundproof wall. In order to reduce the impact and vibration transmitted through the tracks, a method of laying a rubber plate on the roadbed and installing sleepers on it, or pouring a liquid vibration isolator on the concrete roadbed. By adopting the method of installing elastic sleepers with low foaming, the noise generated by roadbed vibrations and impacts is slightly reduced. However, in iron bridges, places with poor roadbed conditions, places where maintenance is not performed sufficiently, or places where the above-mentioned devices are not installed,
When the wheel passes over the rail seam weld, a loud high-frequency impact noise is generated. It has become a problem that it is necessary to frequently perform maintenance work on the track in order to reduce the impact noise.

Therefore, researches and developments have been carried out such as smoothing of the crown surface of rails, long rails, orbital elastic sleeper orbits, and labor saving by an automated machine for maintenance work.
The contents of such research and development are the environmental research No55 (1
985) Pages 69 to 74, Railway Civil Engineering Vol. Two
7, No. 12 (1985), pages 29 to 31, RR
R (Railway Res-earch Review) No3 (1988)
Pages 27-32, RRR No12 (1991)
See pages 9-14.

[0005]

SUMMARY OF THE INVENTION In the above-mentioned prior art, an elastic body or a vibration-proof mat is laid between a plurality of sleepers for fixedly supporting two continuous rails in the vertical direction and the roadbed, and traveling is performed. The rolling noise of rolling stock and the impact noise generated at rail seam welds are reduced. However, the rail surface shape of the rail seam weld and the seam gap tend to change due to seasonal changes, day and night changes, that is, temperature changes. Further, the damping effect of the elastic body and the vibration-proof mat also changes according to the temperature change. Especially in summer, when the outside air temperature rises, the rail surface shape (slightly unevenness) of the rail seam weld deteriorates, and the damping effect of the elastic body and vibration-proof mat laid under the sleeper also deteriorates. Tend to go.
That is, no consideration is given to the fluctuation of the impact sound when the wheel passes over the rail seam welded portion caused by these temperature changes, and it is difficult to further reduce the noise in a vehicle traveling at high speed. There is a problem that there is a tendency.

An object of the present invention is to make a laser beam which is liable to be deformed in the vertical direction even if a seasonal change or a change in the outside air temperature during the day and night occurs.
In order to reduce the fluctuation of the impact sound when the wheel passes over the seam welded part, an impact sound mitigation device is installed, and the damping action of the impact sound mitigation device is adjusted according to changes in the outside air temperature,
It is an object of the present invention to provide a method and an apparatus for reducing the fluctuation of the impact noise of a wheel passing over a rail seam weld.

[0007]

In order to achieve the above object, the present invention provides two rails on which a railroad vehicle travels via wheels and a plurality of sleepers for fixedly supporting the rails on a roadbed. And a shock noise reduction device laid between the roadbed and both ends of the rail seam welds located above the roadbed or sleepers,
A control device that adjusts the damping action of the shock noise mitigation device in response to changes in the outside air temperature, a temperature sensor that detects the outside air temperature, and at least one or more solar cell sources that supply power to these devices are provided. , The damping action of the shock noise reduction device is increased when the outside air temperature rises, and conversely, the damping action is decreased when the outside air temperature falls, so that a substantially constant damping action is always obtained. The method includes a method for reducing fluctuations in impact sound caused by passage of a wheel of a seam welded portion, a device for operating them, and the like.

[0008]

The shock noise reducing device is provided below the rail seam weld, and the entrances and exits of the media of the two damper mechanisms provided in the device are connected to the flap and the variable throttle is provided between them. A mechanism is provided, and the opening / closing degree of the inlet / outlet is adjusted by the valve opening / closing signal from the controller, and the viscous velocity of the medium flowing into / out of each damper mechanism is made variable, whereby the speed operation of two damper mechanisms Is changing
When the wheel passes over the rail seam weld, the vertical speed at which the wheel weight is applied to both rails of the rail seam weld is moderated. As a result, the impact noise in the high frequency region caused by the impact and vibration of the wheel generated when passing through the rail seam weld on the impact noise reduction device is reduced. Also, the damping action of each damper mechanism changes due to seasonal changes (summer, winter, etc.) and changes in the outside air temperature due to day and night. Therefore, by detecting the outside air temperature with multiple temperature sensors, The opening / closing degree of the variable throttle mechanism is adjusted so as to correct the damping action of the damper mechanism. For example, when the outside air temperature rises, the viscous velocity of the medium rises, that is, the viscous resistance of the damper mechanism tends to decrease and the damping action tends to deteriorate, so that the damping action is set to a predetermined value by the variable throttle mechanism. I am trying to make uniform correction. Further, when the outside air temperature drops, the reverse action of the operation is performed. Due to these correction functions, fluctuations in the vertical damping effect of the shock noise reduction device are reduced, and fluctuations in the shock noise of the wheels generated when passing through the rail seam weld are reduced.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to FIGS.

First, a configuration in which a railway vehicle runs at high speed on a track consisting of two upper and lower rails at a location to which the present invention is applied will be described with reference to FIG.

In FIG. 3, reference numeral 1 denotes a railway vehicle, which travels at high speed on two rails 5 which are continuously connected to each other by rotation of wheels 2 attached to a bogie (not shown).
The two rails 5 are fixedly supported via a large number of sleepers 4 having a predetermined interval along the traveling direction on a mountain-shaped roadbed 3 made of concrete or gravel. There is. Each time the wheel 2 passes over the rail 5, wheel weight is applied to the upper surface of the rail 5, so that the sleeper 4 on the roadbed 3 is protected by bolts, nuts or the like in order to prevent the rail 5 from moving. It is fixedly supported by the rail pressing mechanism 6. The anti-vibration mat 7 is laid between the roadbed 3 and the sleepers 4, and is provided so as to reduce vertical vibrations and impacts in the low-frequency region generated when the railway vehicle 1 travels at high speed. One sleeper 4 has two rails 5
The rail 5 is fixedly supported on the inner and outer surfaces by the rail pressing mechanism 6 so that the rail 5 does not bend in the left and right direction and the up and down direction even when subjected to the lateral bending force in the direction perpendicular to the traveling direction and the vertical load fluctuation I have to.

1 and 2, an impact noise mitigation device installed at a rail seam weld portion according to an embodiment of the present invention and a method therefor will be described. Rail seam weld 9 is usually 20
The rails 5 of m are joined by welding to form the top surface of the rails 5 on a smooth surface. Impact noise reduction device 10
Is fixedly supported on the roadbed 3 or the sleeper 4 below both ends of the gap of the rail seam welded portion 9. Then, the rail receiving seat 14 fastened via the rail 5 and the rail receiving mechanism 16 and the two rail receiving seats 14 provided in the left and right direction of the rail receiving seat 14 (the traveling direction of the railway vehicle 1). The damper mechanisms 11 and 12, the variable throttle mechanism 13 provided in the middle of the piping which is configured to be laid in order to flow in and out the medium for operating the damper mechanisms 11 and 12, and the damper mechanisms 11 and 12, A base for fixedly supporting the variable throttle mechanism 13 and fixedly supporting it on the roadbed 3 or the sleeper 4.
15, a controller 17 for outputting a control signal for adjusting the valve opening / closing degree of the variable throttle mechanism 13, and a controller 17
And a solar cell circuit 18 for supplying electric power for operating the. The solar cell circuit 18 uses the solar cell panel 8 laid on the sleeper 4 between the two rails 5 to photoelectrically convert solar heat into direct current power generated by the controller 1.
7 is supplied to or stored in. Temperature sensor 19
Is a detector that detects a plurality of outside air temperatures and the temperatures of the media of the damper mechanisms 11 and 12 and transmits these signals to the controller 17. The plurality of solar cell panels 8 are fixedly supported on the plurality of sleepers 4 and are connected in parallel, and the output currents thereof are input to the solar cell circuit 18.

In the configuration as described above, first, the opening / closing degree of the variable throttle mechanism 13 provided in the impact noise reduction device 10 is adjusted by the valve opening / closing signal from the controller 17, and each damper mechanism is adjusted. The viscous velocity of the medium flowing in and out of 11 and 12 is made variable. That is, by changing the vertical speed operation of the two damper mechanisms 11 and 12,
When the wheel 2 passes over the rail seam weld 9, the wheel weight is applied to one side of the rail seam weld 9, and the rail 5 is vertically deformed. As a result, the impact noise reduction device 10 rotates about the rail seam weld 9 and then the wheel 2
Passes over the rail seam welded portion 9, the impact noise mitigation device 10 translates through the damper mechanisms 11 and 12 to alleviate vertical vibration and impact velocity. As a result,
Rail seam weld 9 where the wheel 2 is easily deformed in the vertical direction
It is possible to reduce the impact sound generated at the point. Also,
Since the damping action of each damper mechanism 11 and 12 changes due to seasonal changes (summer, winter, etc.) and changes in the outside air temperature due to day and night, the outside air temperature and the damper mechanism 1 are changed by a plurality of temperature sensors 19.
The temperatures of the mediums 1 and 12 are detected and the damper is applied by the damping force correction algorithm stored in the controller 17.
The opening / closing degree of the variable diaphragm mechanism 13 is adjusted so as to compensate for the damping action of the mechanisms 11 and 12. For example, if the outside air temperature or the temperature of the medium of the damper mechanisms 11 and 12 rises, the viscosity velocity of the medium increases, that is, the damper.
Since the viscous resistance of the mechanisms 11 and 12 decreases, the damping action tends to deteriorate. Therefore, the damper mechanisms 11 and 12
The constant damping compensation is performed so that the damping action of is a predetermined value. Further, when the outside air temperature drops, the reverse action of the operation is performed. Due to these damping compensation effects, fluctuations in the damping effect in the vertical direction of the shock noise reduction device 10 are reduced, and fluctuations in the shock noise of the wheel 2 that occur when passing through the rail seam weld 9 are reduced. The power required at this time is obtained from the solar cell panel 8 fixed on the sleeper 4.

According to the present embodiment, an impact noise reduction device is installed between the rail seam weld and the roadbed or sleeper at a railway bridge, a place where roadbed conditions are poor, or a place where maintenance is not performed sufficiently. By adjusting the damping effect of the impact sound absorbing device in response to changes in the outside air temperature, etc., fluctuations in the impact noise of the wheels passing over the rail seam welds are reduced, so seasonal changes in outside air temperature Even if fluctuations occur, it is possible to reduce fluctuations in the impact noise that occurs when wheels pass over rail seam welds that are easily deformed in the vertical direction, reduce noise, and frequently perform maintenance work on railroad tracks. There is an effect that there is no need to do it.

[0015]

According to the present invention, when a railroad vehicle travels at high speed on rails via wheels, fluctuations in impact noise at rail seam welds can be reduced, thus reducing noise. This has the effect of reducing the frequency of maintenance work on the railway tracks.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an impact sound absorbing device according to an embodiment of the present invention.

FIG. 2 is a front view of a track including a rail seam weld.

FIG. 3 is a track configuration diagram of a railway vehicle.

[Explanation of symbols]

1 ... Rail vehicles, 2 ... Wheels, 3 ... Roadbed, 4 ... Sleepers, 5
... rail, 6 ... rail pressing mechanism, 8 ... solar cell panel,
9 ... Rail seam weld, 10 ... Impact noise reduction device, 1
1, 12 ... Damper mechanism, 13 ... Variable diaphragm mechanism, 14 ...
Rail receiving seat, 15 ... Base, 16 ... Rail receiving mechanism,
17 ... Controller, 18 ... Solar cell circuit, 19 ... Temperature sensor.

Claims (4)

[Claims] 1. Rails on which a railroad vehicle travels via wheels, a plurality of sleepers for fixedly supporting the rails on a roadbed, and rails between or on the sleepers. Of the impact sound absorbing device located at the seam welding point between the rail and the roadbed or between the rail and the sleeper, and the sun for supplying the electric power necessary to reduce the impact sound by the impact noise reducing device. An impact noise reduction device for railway rails, characterized by comprising a battery source. 2. A rail rail impact noise reduction device according to claim 1, wherein one impact noise reduction device is provided near the rails at both ends of the seam welded portion, and a vibration control mechanism is provided. And a variable throttle mechanism that changes the damping action of the vibration control mechanism by suppressing the flow velocity operation of the medium circulating between them, a control device that drives and controls the vibration control mechanism, and a necessary for operating the control device. An impact noise reduction device for a railroad rail, which comprises a solar cell circuit for obtaining electric power. 3. The railway rail impact noise mitigation device according to claim 1, wherein the solar cell sources are fixedly supported on the sleepers and connected in parallel, and the output current thereof is input to the solar cell circuit. An impact noise mitigation device for railroad rails, which is characterized by: 4. The railway rail impact noise mitigation device according to claim 2, wherein the variable throttle mechanism is adjusted by an output value of a temperature sensor, and has a characteristic of reducing as the outside air temperature rises, and conversely as the outside air temperature falls. An impact noise mitigation method for a railroad rail, characterized in that the spring constant and the damping coefficient ratio of the vibration suppressing mechanism are variably controlled.