JP2873142B2 - Apparatus and method for testing fluid characteristics of tracked vehicle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluid characteristic test apparatus for a tracked vehicle that measures the hydrodynamic characteristics including the influence of a track in a vehicle traveling on a track at a high speed.

[0002]

2. Description of the Related Art Conventionally, aerodynamic characteristics of a vehicle are generally measured by a wind tunnel test. In vehicles that travel on a track at high speed, such as a linear motor car and a Shinkansen vehicle, the hydrodynamic characteristics of air including the influence of the track are important. For this reason, the vehicle model and the trajectory model for the wind tunnel test must be manufactured, installed, and tested so as to mimic the hydrodynamic state between the relatively moving vehicle and the trajectory as much as possible.

[0003]

In a conventional wind tunnel test, the vehicle model does not move relative to the track model, so that the hydrodynamic state between the vehicle and the track differs from the actual running state. In particular, when the gap between the vehicle and the track is narrow and long, the measurement result greatly differs from the actual value.

[0004] In consideration of the influence of the relative speed between the vehicle and the trajectory, it is necessary to perform a test for moving the vehicle model and the trajectory model at a relatively high speed. For this reason, in a special case, a test is performed by providing a vehicle model on an endless belt simulating the ground. However, the track of a railway car is three-dimensional, and it is difficult to realize an endless track, especially for a linear motor car that is guided by a guideway having a U-shaped cross section and levitates at high speed. It is.

An object of the present invention is to provide a vehicle that runs at high speed,
An object of the present invention is to provide a fluid characteristic test device and a test method for a tracked vehicle that make the relationship of relative movement with a track, relative distance, and the like similar to actual conditions and grasp accurate fluid characteristics.

[0006]

SUMMARY OF THE INVENTION The present invention provides a water tank, a track model provided in the water tank, a vehicle model movable relative to the track model, and a moving means for moving the vehicle model in the water tank. And measuring means for measuring a phenomenon that occurs when the vehicle model is moved.

Further, in the present invention, the vehicle model hydrodynamically corresponds to a linear motor car, and the track model hydrodynamically corresponds to a linear motor car guideway.

Further, the present invention is characterized in that a trajectory model is installed in still water, a vehicle model is moved relative to the trajectory model in still water, and a phenomenon that occurs is measured.

[0009]

According to the present invention, the vehicle model moves relative to the track model in the still water tank. The measurement is performed by moving the vehicle model on the vehicle side or the track side, and measuring phenomena that occur, such as changes in acting force, pressure, and flow velocity. According to Reynolds' similarity law, phenomena requiring a high speed in still water and in air can be easily measured.

Further, according to the present invention, it is possible to measure a phenomenon that occurs when the vehicle model of the linear motor car is relatively moved while keeping a narrow gap with the track model of the guideway for the linear motor car. This makes it easy to measure, for example, the drag generated in the linear motor car traveling on the guideway while keeping a narrow gap, the influence on the guideway due to traveling, and the like.

[0011]

FIG. 1 shows an apparatus for testing fluid characteristics of a tracked vehicle according to an embodiment of the present invention. The vehicle model 1 is a model in which a linear motor car is reduced at a fixed rate. The guideway 2 and the trajectory model 2 are models in which the guideway on which the linear motor car is guided to levitate and run is reduced in scale at a fixed ratio. The trajectory model 2 has a substantially U-shaped cross section. The vehicle model 1 and the trajectory model 2 relatively move in the still water 4 stored in the still water tank 3.

The relationship between the vehicle model 1 and the trajectory model 2 is modeled so as to be similar to the relationship between the actual vehicle and the trajectory. For hydrodynamic model testing,
Generally, the closer the Reynolds number is to the actual object, the better the accuracy is.

Here, the Reynolds number R is represented by the following equation (1).

[0014]

Where ρ is the density, η is the kinematic viscosity coefficient, L is the typical length of the object in the flow, and U is the velocity. 4-5m in water
To move at a speed of / m is equivalent to moving at 60 to 75 m / s in the wind tunnel because the water η is about 1/15 of that of air at room temperature.

The track model 2 is supported by a track support member 5, and the mounting position is adjusted by an adjusting member 6.
The track support member 5 is held in the still water tank 3 by the holding member 8 via the mounting piece 7. One side of the lower end of the track support member 5 is pressed by the moment of gravity to the side wall of the tank via the adjusting screw 9.

The vehicle model 1 is suspended in the still water 4 by a suspension member 10. The suspension member 10 includes the load cell 1
1 and to the mounting member 13 via the pin joint 12. The mounting member 13 is fixed to the moving body 14. The moving body 14 is movable in a direction perpendicular to the plane of FIG. 1 with the wheels 15 guided by the rails 16.

FIG. 2 is a plan view showing a configuration related to the track support member 5 shown in FIG. The mounting piece 7 is provided with a long hole 7a, and is mounted on the receiving metal 17. The receiving member 17 is a holding member 8 extending in parallel in the longitudinal direction of the guideway model 2.
Attached to Both ends of the mounting member 8 are fixed to mounting metal 19 on the upper surface of the still water tank 3 by fixing pieces 18.

A vehicle model 1 shown in FIG. 1 is a model of a linear motor car, and a carriage 2 in which superconducting magnets and the like are stored.
One model is also formed. Facing the lower surface of the carriage 21,
The projection 22 on the guideway is also formed on the guideway model 2. The distance between the carriage 21 and the guideway model 2 becomes extremely small, and a sufficient test cannot be performed because air does not flow in a wind tunnel experiment or the like.
According to this embodiment, since the vehicle model 1 and the guideway model 2 move relatively, it is possible to sufficiently realize a hydrodynamic phenomenon that occurs in a narrow gap.

FIG. 3 shows a configuration related to the vehicle model 1. The vehicle model 1 includes a leading model 1a and an intermediate model 1b.
And the tail model 1c are connected to each other while keeping a gap. Parts corresponding to the embodiment shown in FIG. 1 are denoted by the same reference numerals. Suspension members 10a, 10 of the leading model 1a
The portions between b are connected by a connecting plate 23. Intermediate model 1
The suspension members 10c and 10d for suspending the b
Linked by Further, the suspension member 10e of the tail model 1c is connected to another suspension member 10f by the connecting plate 25. Each suspension member 10a, 10b, 10c, 10d,
10e, 10f are load cells 11a, 11b, 11
c, 11d, 11e, 11f and pin joints 12a, 1
It is attached to the attachment member 13 via 2b, 12c, 12d, 12e, 12f. These suspension members, load cells, and pin joints are collectively referred to by reference numerals 10, 11, and 12, respectively. In this manner, the suspension member 10 is
Since the vehicle 1 is attached to the attachment member 13 via the pin joint 12, the load cell 11 detects the load of the vehicle model 1 in the front-rear, left-right, and vertical directions. The suspension members 10 are connected by connecting plates 23, 24, 25. The suspension member 10 and the connecting plates 23, 24, 25 are fixed to the fixing portions 23a, 23b, 2
4c, 24d, 25e, and 25f are fixed by screws or the like. The suspension member 10 and the vehicle model 1 are fixed at joints 31, 32, 33, 34, 35, 36. Therefore, the space between the suspension member 10 and the vehicle model 1 is rigidly fixed. Load cell 11 and mounting member 13
Is mounted by the pin joint 12, so that no moment force is applied to the load cell 11 about the left-right direction of the vehicle.

The mounting member 13 includes mounting portions 41, 42, 4
3, 44, 45, 46 and 47 are attached to the moving body 14 shown in FIG. FIG. 4 is a plan view of the vehicle model 1 shown in FIG.

In the embodiment shown in FIG. 1, the load cell 11 is attached to the suspension member 10 to measure the hydrodynamic longitudinal, lateral, lateral and vertical forces acting on the vehicle model 1. The load cell 11 measures a load applied by attaching a strain gauge to a metal material such as iron and detecting the strain. A pressure measuring hole, a pitot tube, and the like are also provided on the guideway model 2 side, and the pressure on the surface of the guideway model 2 and the guideway model 2 and the vehicle model 1
Needless to say, it is possible to detect the flow velocity, pressure and the like between them.

FIG. 5 shows an apparatus for testing fluid characteristics of a tracked vehicle according to another embodiment of the present invention. FIG. 6 shows a side section of the embodiment shown in FIG. This embodiment is similar to the embodiment shown in FIG. 1, and corresponding parts are denoted by the same reference numerals. It should be noted that the load cell 11 is mounted in the vehicle model 51. This allows the suspension member 1 to be moved while moving.
The resistance of water acting on zero can be made independent of the detection power of the load cell 11. The load cell 11 is a vehicle model 5
Since only the acting force (up, down, left, right, front and back) acting on 1 is detected, measurement accuracy is improved.

In the embodiment shown in FIGS. 1 and 5,
Although a hydrodynamic test is performed between the linear motor car and the guideway, it goes without saying that a hydrodynamic test may be performed between the Shinkansen vehicle and the track. Even in the case of Shinkansen bullet trains, it is especially necessary to provide side walls beside the tracks and adjust the unevenness under the vehicle because of the need to prevent noise, etc., and the fluid dynamic characteristics of vehicles and tracks running at high speeds are measured. It is important to do. According to the present invention, a test requiring a high speed in the air can be performed at a relatively low speed in still water.

[0024]

As described above, according to the present invention, the vehicle model can be moved relative to the trajectory model in still water, so that a test requiring a high speed in the air can be performed at a relatively low speed. Can be done at speed.

Further, according to the present invention, it is possible to easily measure a hydrodynamic phenomenon occurring in a linear motor car traveling at high speed on a guideway.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an apparatus for testing fluid characteristics of a tracked vehicle according to an embodiment of the present invention.

FIG. 2 is a plan view showing a configuration related to a track support member 5 of the test apparatus shown in FIG.

FIG. 3 is a side sectional view showing a configuration related to the vehicle model 1 shown in FIG. 1;

FIG. 4 is a plan view of the vehicle model 1 shown in FIG. 3;

FIG. 5 is a sectional view of a fluid characteristic test apparatus for a tracked vehicle according to another embodiment of the present invention.

FIG. 6 is a side sectional view showing a configuration related to the vehicle model 51 shown in FIG. 5;

[Explanation of symbols]

 Reference Signs List 1,51 Vehicle model 2 Guideway model 3 Still water tank 4 Still water 5 Track support member 6 Adjustment member 10 Hanging member 11 Load cell 12 Pin joint 13 Mounting member 14 Moving body 21 Cart 23,24,25 Joint plate

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Makoto Ogawara 2-1-1-18 Wadayama-dori, Hyogo-ku, Kobe-shi, Hyogo Kawasaki Heavy Industries, Ltd. Hyogo Plant (72) Inventor Masato Miwa Hyogo-ku, Kobe-shi, Hyogo 2-1-1-18 Wadayama-dori Kawasaki Heavy Industries Co., Ltd. Hyogo Plant (72) Inventor Masahiro Kagawa 1-4-1 Meieki Station, Nakamura-ku, Nagoya-shi, Aichi Tokai Railway Company (72) Inventor Kazuhiro Igarashi (1) 1-4-1 Meiji Station, Nakamura-ku, Nagoya-shi, Aichi Tokai Passenger Railway Co., Ltd. (72) Inventor: Shiro Hosaka 1-4-1, Meiji Station, Nakamura-ku, Nagoya-shi, Aichi Tokai Passenger Railway Co., Ltd. Field surveyed (Int. Cl. ⁶ , DB name) G01M 10/00 G01M 9/00

Claims (3)

(57) [Claims] 1. A still water tank, a trajectory model provided in the still water tank, a vehicle model movable relative to the trajectory model, a moving means for moving the vehicle model in the still water tank, and when moving the vehicle model, A fluid characteristic testing device for a tracked vehicle, comprising: measuring means for measuring a phenomenon that occurs. 2. The tracked vehicle according to claim 1, wherein the vehicle model hydrodynamically corresponds to a linear motor car, and the track model hydrodynamically corresponds to a linear motor car guideway. Fluid property test equipment. 3. A test of fluid characteristics of a tracked vehicle, wherein a track model is installed in still water, a vehicle model is moved relative to the track model in still water, and a phenomenon that occurs is measured. apparatus.