CN115648950A - Bionic device, bionic sliding plate and pantograph - Google Patents

Abstract

The invention provides a bionic device, a bionic sliding plate and a pantograph, and relates to the field of train aerodynamics.

Description

Bionic device, bionic sliding plate and pantograph

Technical Field

The invention relates to the field of train aerodynamics, in particular to a bionic device, a bionic sliding plate and a pantograph.

Background

Along with the increase of the running speed of the high-speed train, the research on the aerodynamic performance of the high-speed train is deeper, a system is formed for optimizing the head shape of the high-speed train, and the bottleneck that the aerodynamic resistance is reduced by optimizing the head shape is reached. The pantograph is exposed outside a streamline body of the train as an important part of the high-speed train, and generates large aerodynamic resistance. Therefore, it is necessary to develop a research on aerodynamic drag reduction of the pantograph.

At the present stage, main measures for drag reduction of the pantograph mainly have two directions, one is to increase a flow guide cover around the pantograph or enable the pantograph to sink into a vehicle body, the other is to optimize the appearance of the pantograph, no matter which of the two modes is adopted, the pantograph or accessory parts need to be changed, the engineering is complex, and a retest is needed to ensure the safety.

Disclosure of Invention

The invention provides a bionic device, and aims to reduce the pneumatic resistance of a pantograph when a train runs at a high speed.

In order to achieve the above object, an embodiment of the present invention provides a bionic device, wherein a groove for clamping an original sliding plate is disposed on an upper surface of the bionic device, the bionic sliding plate is fin-shaped, a protruding fin is formed by protruding a windward side of the bionic device, and a plurality of protruding fins are arranged in a wave shape.

Furthermore, the upper surface and the lower surface of the bionic device are symmetrical, and the upper surface contour fitting curve of the bionic sliding plate meets the requirement of y _{Upper surface of} ＝-14.168x ⁴ -2.2697x ³ +0.8039x ² +0.1433x-0.0004(y>0) The fitting curve of the lower surface profile of the bionic skateboard satisfies y _{Lower surface} ＝14.168x ⁴ +2.2697x ³ -0.8039x ² -0.1433x+0.0004(y<0)。

Further, the wave shape of the convex fin in the x direction satisfies y _{Convex fin} ＝22.23+15.81cos(0.04868x)-1.678sin(0.04868x)。

Furthermore, the upper surface and the lower surface of the bionic device form a tip at the tail side.

The application also provides a bionic sliding plate, adopts aforementioned bionic device, still includes original slide, and original slide is by in the upper surface card income recess of bionic device.

Furthermore, the bionic device and the original sliding plate are both made of graphite materials.

The application also provides a pantograph, adopts aforementioned bionical slide, still includes:

the bionic sliding plate is arranged on the bow head, the tail end of the bow head is provided with an upper arm rod,

one end of the lower arm rod is rotatably connected to the middle part of the upper arm rod, the other end of the lower arm rod is connected with a lifting mechanism, and the lower arm rod rotates under the action of the lifting mechanism;

one end of the pull rod is rotatably connected with one end of the upper arm rod, which is far away from the bow head, and the other end of the pull rod is hinged with the lifting mechanism.

The scheme of the invention has the following beneficial effects:

the application provides a bionic device wholly presents the fin shape, and when the air current that the train moved ahead flowed through bionic device, the vortex will be produced in bionic device department, and the energy of vortex will supply in the boundary layer of bionic device, thereby reduces the flow separation of air current and reach pneumatic drag reduction's effect.

Drawings

FIG. 1 is a schematic structural diagram of a biomimetic apparatus;

FIG. 1a is a schematic representation of the fitting of a top surface of a biomimetic device;

FIG. 1b is a schematic illustration of a convex fin fitting of a biomimetic device;

FIG. 2 is a schematic structural diagram of the bionic skateboard;

fig. 3 is a schematic structural view of a pantograph;

FIG. 4 is a flow chart (closed mouth) of an original pantograph and an original skateboard;

FIG. 5 is a flow chart (closed mouth) of the bionic pantograph and the bionic slide plate;

FIG. 6 is a vortex diagram of a bionic skateboard.

[ description of reference ]

1-original slide plate, 2-bionic device, 21-convex fin and 22-groove;

3-bow head, 4-upper arm rod, 5-lower arm rod, 6-lifting mechanism and 7-pull rod

Detailed Description

In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments.

The invention provides bionic devices 2 and 6 aiming at the existing problems, and as shown in figures 1, 1a and 1b, the bionic device 2 is fin-shaped as a whole and is divided into a windward side and a tail side, wherein the windward side is a larger end, the tail side is a smaller end, a plurality of convex fins 21 are formed on the windward side in a protruding mode, and the convex fins 21 are arranged in a wavy mode.

Preferably, the thickness of the convex fin 21 at the windward side end is smaller than the height of the convex fin 21 at the middle part, and the windward side of the convex fin 21 plays a role of vortex generation and guides the vortex to flow along the surface of the convex fin 21, so that the vortex energy is supplied to the surface boundary layer fluid area of the bionic device 2.

Further, the upper surface and the lower surface of the bionic device 2 are symmetrical, wherein the upper surface contour fitting curve satisfies y _{Upper surface of} ＝-14.168x ⁴ -2.2697x ³ +0.8039x ² +0.1433x-0.0004(y>0) The lower surface contour fitting curve satisfies y _{Lower surface} ＝14.168x ⁴ +2.2697x ³ -0.8039x ² -0.1433x+0.0004(y<0). The fitting that provides in this application is injectd, can be so that the air current forms the vortex in bionic device 2 department, and the energy of vortex will supply to the boundary layer in, reduces the flow separation of air current, and then plays the effect of drag reduction.

Further, a groove 22 is formed in the upper surface of the bionic device 2, and the groove 22 is used for accommodating the original skateboard 1.

Further, the aforementioned convex fin 21 satisfies y in the waveform in the x direction _{Convex fin} ＝＝22.23+15.81cos(0.04868x)-1.678sin(0.04868x)。

Further, the upper and lower surfaces of the biomimetic device 2 form tips at the caudal side.

The application also provides a bionic sliding plate, which is used by matching the bionic device 2 with the original sliding plate 1, so that the effect of reducing the aerodynamic resistance is achieved.

Referring to fig. 2, 4, 5 and table 1, the original slide board 1 has the upper surface of the bionic device 2 clamped into the groove 22, and the original slide board 1 does not damage the upper surface profile of the bionic device 2. By comparing fig. 4 and fig. 5, wherein the upper part of fig. 4 and fig. 5 shows the line graphs of the original skateboard 1 and the bionic skateboard, the lower part shows the original pantograph and the pantograph line graph provided by the application, it can be seen from the graph that after the bionic skateboard is optimized, the acceleration effect of the incoming current close to the wall surface of the bionic skateboard on the windward side is obviously increased compared with the original pantograph, and the flow separation of the reflux area at the tail part of the bionic skateboard and the airflow is obviously reduced, thereby effectively playing the role of resistance reduction.

Referring to fig. 3-5, the application further provides a pantograph using the bionic sliding plate, further comprising a pantograph head 3, the bionic sliding plate is arranged at the front end of the pantograph head 3, an upper arm rod 4 is arranged at the tail end of the pantograph head 3, the middle of the upper arm rod 4 is rotatably connected with a lower arm rod 5, the other end of the lower arm rod 5 is connected with a lifting mechanism 6, the lifting mechanism 6 can pull the lower arm rod 5 to rotate at the hinged position of the lower arm rod 5 and the upper arm rod 4, a pull rod 7 is further arranged at one end, far away from the pantograph head 3, of the upper arm rod 4, the pull rod 7 is hinged to the upper arm rod 4, and the other end of the pull rod is hinged to the lifting mechanism 6.

In this application, through installing bionical slide on the pantograph, the contact of bionical slide and cable is realized in the lift through elevating system 6. In this application, improve the pantograph on the basis of not destroying original slide 1, remain the upper surface of original slide 1, can not influence the stability that the pantograph received current, can also reduce aerodynamic drag.

Referring to fig. 4 and 5, it can be seen from the flow charts that the optimized connection between the bow head 3 and the upper arm rod 4 has a speed reduction zone, but the total resistance is obviously reduced. The study in table 1 shows that the aerodynamic resistance of the sliding plate is reduced by 39.10%, and the overall resistance of the pantograph is reduced by 8.83%.

TABLE 1 comparison of aerodynamic resistance of original Pantograph and Bionical Ring plate Pantograph

While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (7)

1. A biomimetic device, comprising: the upper surface of the bionic device is provided with a groove used for clamping an original sliding plate, the bionic sliding plate is of a fin shape, protruding fins are formed on the windward side of the bionic device in a protruding mode, and the protruding fins are arranged in a wavy mode.

2. The biomimetic device of claim 1, wherein: the upper surface and the lower surface of the bionic device are symmetrical, and the upper surface contour fitting curve of the bionic sliding plate meets the requirement of y _{Upper surface of} ＝-14.168x ⁴ -2.2697x ³ +0.8039x ² +0.1433x-0.0004(y>0) The fitting curve of the lower surface profile of the bionic skateboard satisfies y _{Lower surface} ＝14.168x ⁴ +2.2697x ³ -0.8039x ² -0.1433x+0.0004(y<0)。

3. The biomimetic apparatus of claim 2, wherein: the wave shape of the convex fin in the x direction satisfies y _{Convex fin} ＝22.23+15.81cos(0.04868x)-1.678sin(0.04868x)。

4. The biomimetic device of claim 1, wherein: the upper surface and the lower surface of the bionic device form a tip at the tail side.

5. A biomimetic skateboard comprising the biomimetic apparatus of claims 1-4, wherein: the bionic device is characterized by further comprising an original sliding plate, wherein the original sliding plate is clamped into the groove from the upper surface of the bionic device.

6. The biomimetic skateboard of claim 5, wherein: the bionic device and the original sliding plate are both made of graphite materials.

7. A pantograph employing the biomimetic skateboard of claims 5-6, further comprising:

the bionic sliding plate is arranged on the bow head, the tail end of the bow head is provided with an upper arm rod,

one end of the lower arm rod is rotatably connected to the middle part of the upper arm rod, the other end of the lower arm rod is connected with a lifting mechanism, and the lower arm rod rotates under the action of the lifting mechanism;

one end of the pull rod is rotatably connected with one end of the upper arm rod, which is far away from the bow head, and the other end of the pull rod is hinged with the lifting mechanism.

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