JPH04156204A - Noise insulator for pantograph - Google Patents

Abstract

PURPOSE:To suppress the increase in air resistance of pantographs of a train of cars traveling inside a tunnel and to maintain an effect of reducing the external noise by pantographs of the train of cars traveling outside a tunnel by detecting the running condition of the train of cars traveling in a tunnel and by controlling the front and back covers for every pantograph so as to be turned down throughout traveling inside the tunnel and to be protruded throughout traveling outside the tunnel. CONSTITUTION:An on-board tunnel position detector 8 of a train of cars, when passing a tunnel, receives signal currents having a particular frequency from ground position sensors installed on the track at the entry and exit of the tunnel, respectively, and from an on-board position sensor to detect the present passing position of the train. A controller 9, based on a signal from a tunnel position detector 8, controls front and back cover drives 7a and 7b to turn down the front and back covers 4a and 4b for pantographs immediately after passing the entry of the tunnel and to protrude the front and back covers 4a and 4b immediately after leaving the tunnel all at a time. With this, air pressure acting on the train of cars passing inside the tunnel can be reduced, thus reinforcing the strength of car body.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a sound insulation Ml for a pantograph, and particularly to a sound insulation device for a pantograph suitable for a railway vehicle traveling at high speed in a tunnel.

[Conventional technology]

As a conventional sound insulation device for pantographs of railway vehicles, it is actually 1595074/1974! As described in the publication, there is a known method of sound insulation by arranging a barrier (sound insulation cover for pantograph) around a pantograph.

[1181 to be solved by the invention] The above-mentioned prior art shields the sound generated from the pantograph,
In addition, if the barrier after l has a sufficient height relative to the maximum height of the pantograph, the average flow velocity of the airflow hitting the pantograph can be lowered, and the sound pressure level in front of the pantograph can be reduced. bring. Here, in order to lower the average flow velocity of the airflow hitting the pantograph, the height of the rear cover of the pantograph sound insulation l1tllI should be made sufficiently high, and the angle of inclination of one side should be increased, so that the upstream side l1tllI
It is effective to increase the separation of the airflow at the upper end of the I rear cover, but this increases air resistance and the compression waves generated when entering the tunnel propagate inside the tunnel, and some of it is transmitted from the exit. No consideration was given to the air pressure sound that is emitted. In particular, there has been a problem in that excessive air resistance occurs when traveling in a tunnel.

In other words, compared to the air resistance when running outside the tunnel, the air resistance when running inside the tunnel is roughly calculated as (1-R'), where R is the ratio of the vehicle cross-sectional area to the tunnel curve area.
It increases to about twice as much, and for a Shinkansen train of 0.22 in B, it becomes about 2.1 times. Of these, a of the sound insulation device for the pantograph can be sufficiently reduced to reduce the average flow velocity hitting the pantograph.
If the rear U cover is made sufficiently high and the inclination angle of the U plane is large, the increase in air resistance due to the addition of a pantograph sound insulation device will reach about 10%, although it depends on the number of pantographs.

An object of the present invention is to provide a sound insulation device for a pantograph of a railway vehicle that can suppress an increase in air resistance when traveling inside a tunnel and maintain the effect of reducing external noise when traveling outside the tunnel.

(Means for solving ml!a) In order to achieve the above object, the l1I7 rear cover of the pantograph sound insulating device is supported so as to be protrusive and retractable, and is provided with a driving means, and is The vehicle is equipped with a control means that detects the running state and controls the front and rear covers to be in a retracted state when the vehicle is running inside a tunnel, and to project the front and rear covers when the vehicle is running outside the tunnel.

[For production]

In the above configuration, the front and rear covers, which are supported in a protruding and retractable manner, are detected by the tunnel running state detecting means of the column and are retracted by the driving means after entering the tunnel, and the escape from the tunnel is directly hit or exited. II
Control is performed by the control means to cause the drive means to operate at #L so that it protrudes.

This makes it possible to significantly reduce the amount of air resistance caused by the rear cover among the increase in air resistance when traveling in a tunnel. In addition, by protruding the UJ rear cover after escape from the tunnel [intoxication or escape], among the pantograph aerodynamic sound reduction effects by the pantograph sound insulating cover, two of the effects of reducing the average flow velocity of the airflow hitting the pantograph are maintained. can.

〔Example〕

Hereinafter, an example of the present invention will be explained based on one side. 1st
The figure shows a first embodiment of the present invention.

In Fig. 1, reference numeral 1 indicates the single roof of a railway vehicle, and a sound insulation cover 3 is provided on a part of the roof 1 to surround a pantograph 2 that slides on the overhead wire 1O, and the sound insulation cover 3 is mounted on a part of the roof 1 when it is running. It consists of a rear cover 41°4b and a side cover 5. Here, the 1ilI#L cover 4, 4b is supported by links *16a, 6b so that it can be protruded and retracted, and is protruded and retracted by the expansion and contraction operation of the drive Ijb device 71°7b. The tunnel position detection device Fg is a 1 rear force bar 4m, 4
Storage operation point of b and escape from tunnel ll1f
When a train passes over the ground element installed on the track at the point where the front and rear covers 4m and 4b protrude immediately after f or escape, the control device receives and detects a signal flow of a unique frequency through the upper element. 9 is based on the signal from the tunnel position detection device 8, and after passing the retracting operation point, the driving device [7m, 7b] [I After passing the retracting operation and ejecting operation point of the rear cover 4m, 4b, the drive a * 17 Otori, 7b The protruding movement of the front and rear covers 41.degree. 4b and the pantograph attachment are simultaneously controlled on the vehicle.

The air resistance when running inside a tunnel is compared to the air resistance when running outside, where R is the vehicle/tunnel cross-sectional area ratio.
(1-R), and for example, in a Shinkansen train with a depth of 0.22, if the train length is 400 mm, the difference will be 2.1 times. According to the inventor's estimation based on wind tunnel experiments, l[r
When the height and front inclination angle of the Il cover 4 and 4b are configured, the air resistance due to the - pair of sound insulating cover 3 and pantograph 2 is 200) im when traveling outside the tunnel.
This is approximately 30011f when traveling at 1/h, which corresponds to the sound insulating cover 3 and pantographs accounting for 2016 or more of the total air resistance when six pantographs are installed in the formation. On the other hand, when the front and rear covers 4 and 4b are retracted, the air resistance due to the - pair of sound insulation covers 3 and pantograph 2 is approximately 150 Kff, and the air resistance inside and outside the tunnel due to the reduction of the vehicle/tunnel cross-sectional area ratio in the retracted state is In addition to reducing the increase in resistance, the present invention reduces the air resistance when driving in a tunnel by approximately 1,996 yen according to the above trial calculation example.
In addition, in a trial calculation when two pantographs are installed in a formation, it is expected that an air resistance effect of about 12 - will be obtained.

By the way, it is known that compression waves generated when a railway vehicle enters a tunnel at high speed propagate inside the tunnel, and a portion of the waves is radiated from the exit, producing air pressure sound (micropressure waves). The maximum pressure gradient of the compression wave at the entrance when entering a tunnel, which is related to the magnitude of this air pressure sound, is +1-(1-几)l/( Vlo-(1-R)). Therefore, the increase in the front projected area due to the front and rear covers 41.4b, which increases the cross-sectional area of the vehicle body relative to the cross-sectional area of the tunnel, causes an increase in the maximum pressure gradient of the compression wave.

According to the embodiment, since the front and rear covers 4m and 4b can be stored when entering a tunnel, the maximum pressure gradient of the Hle compression wave can be suppressed to the same level as when the front and rear covers 4m and 4b are not present, and air pressure noise can be reduced. Can be reduced. In addition, the pressure acting on the vehicle inside the tunnel is also reduced, which is advantageous in terms of the strength of the vehicle body.

In this embodiment, the rear I covers 4a and 4b are protruded immediately before or after escaping from the tunnel. is the omission or omission of a protruding motion.

A delay may be used. In this case, arbitrary control is possible by arranging a ground element on the orbit for detecting the protruding and retracting operations. Furthermore, the front and rear covers 4a, 4b do not necessarily have to be stored on the same smooth surface as the roof 10 of the vehicle body to reduce air resistance. Furthermore, by monitoring the retracted and protruded states of the front and rear covers 4m and 4b from the driver's seat, it is possible to lower the power row by a notch and reduce power consumption, taking into account the reduction in air resistance when retracted. be. In addition, the front and rear covers 4a, 4b
The retracted/extended state of the train may be linked to the train's travel control system to automatically control the running speed.

By the way, regarding the above-mentioned tunnel position detection means, in addition to performing the ejection and retraction operation positions by a combination of the beacon and the onboard element, the distance from the existing beacon to the retraction and ejection operation points can be stored on the car. A method for detecting the position by storing the number of revolutions of the wheel in a memory, Artificial 1IIIJ
A method of measuring the distance from multiple geostationary satellites and detecting the position using 1, a method of emitting radio waves to the orbital surface using microwave radar, and counting the reflected waves and bead waves, or a combination of these methods, etc. method is available. Alternatively, a method of detecting a tunnel using a direct macro wave detector or the like may be used.

Next, a second embodiment according to the present invention will be explained with reference to FIG. In the figure, the same reference numerals as in the first embodiment indicate the same members. The differences between this embodiment and the first embodiment are as follows:
The front and rear covers 1a and 4b are disposed above the fixed front and rear covers 112°ub so as to be protrusive and retractable. According to such a configuration, the first
In addition to the effects of the embodiments, there is an advantage (1) in that the installation space for the drive devices 7a and 7b can be saved.

〔Effect of the invention〕

As explained above, according to the present invention, it is possible to reduce air resistance when traveling in a tunnel.

``ゞ'')'1jllal111 Figure 1 is a side view of the first embodiment of the present invention, and Figure 2 is a side view of the second embodiment of the present invention.

4 heat, 4b...In cover, 6m, 6b...
...link device, 7m, 7ti...drive length u
18... Tunnel Station Hinoki 1jlt, 9
−・− Control system agent Patent attorney Katsuo Ogawa 2)、・：ward／ ゛～に・′;4 l Figure day−? I J, 117 Cloth 1 17 Figure 1 Ft)-

Claims (1)

[Claims] 1. A sound insulation device for a pantograph that is provided around a pantograph and shields the sound generated from the pantograph, which includes front and rear covers that are supported so as to be protrusive and retractable, and that the front and rear covers are driven. a driving means for driving the front and rear covers to cause the front and rear covers to protrude and retract; a detection means for detecting the running state of the train in the tunnel; and a control means for controlling the drive means so that the pantograph is in a retracted state. 2. In a pantograph sound insulation device that is installed around a pantograph and shields the sound generated from the pantograph, a front and rear cover that is supported so as to be able to protrude and retract is disposed above the fixed front and rear cover, and the protrusion and the a driving means for protruding and retracting the front and rear covers that are supported so as to be retractable; a detection means for detecting the running state of the train in the tunnel; A sound insulation device for a pantograph, comprising a control means for controlling the drive means so that the pantograph is in a retracted state. 3. The sound insulation device for a pantograph according to claim 1 or 2, wherein the sound insulation device for a pantograph is controlled so that the front and rear covers are kept in a retracted state even in a specific section when traveling outside a tunnel. 4. In a railway vehicle equipped with a sound insulation device for pantographs that shields sounds generated from pantographs, front and rear covers are supported to allow the sound insulation device to be extended and retracted, and the front and rear covers are driven to cause the projection and retraction operations. and a control means for instructing the drive means to protrude and retract the front and rear covers, and further comprising state detection means for detecting the protrusion and retraction states of the front and rear covers. . 5. The railway vehicle according to claim 1, wherein the state detection means is linked to a travel control system.