JPS6138544A - Testing device for rainfall collision - Google Patents

Abstract

PURPOSE:To suppress vibrations accompanying the rotation of a rotating body by providing a rotating blade with a structure damping mechanism and an aerodynamic force. CONSTITUTION:The structure damping material 22 is fitted on the blade surface of the rotating blade 9 and an aerodynamic material (fin) 21 is fitted behind a pod 1. Therefore, vibrations of the rotating blade 9 are suppressed by damping materials 21 and 22, so the rotating blade 9 is allowed to rotate at a high speed, taking a test in a state close to the state of an actual machine such as an aircraft radome.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides rain g! 4
This invention relates to a raindrop collision test device that simulates collision conditions.

[Prior Art] Conventionally, a raindrop collision test device has been used to elucidate the mechanism of destruction of aircraft radomes, paint, etc. caused by raindrop collisions during flight during rain.

An example of this type of device is one that uses a construction method drop test in which raindrops are substituted for construction methods. However, this device lacks the ability to simulate the transient phenomenon that occurs when raindrops collide with an object, and as a testing method, it can only provide a limited estimate, and a technical solution has not yet been reached.

As another example, as shown in FIG. 5, a part of the leading edge of the circumferential part of the rotor blade 52 is cut out in a large reinforced concrete shield 51, a small sample 55 is attached thereto, and the rotor blade 52 is attached. There is a raindrop collision test device that is supported by a pedestal 53 and rotated at a predetermined speed, and is designed to cause raindrops scattered by centrifugal force from a raindrop generator 54 to collide with a sample 55. Since this device uses actual raindrops, it can also simulate transient phenomena, making it extremely effective as a test device. However, the equipment has to be large-scale, the sample mounting area is small and the shape of the sample is limited, and the rainfall condition setting ゛ (rainfall amount 2
These problems pose technical obstacles to improving this type of test method.

[Problems to be Solved by the Invention] As described above, the conventional apparatus has the following problems (1) to (2).

■ Protective airspace will become large-scale.

■ The shape and size of the sample is limited.

■ It is difficult to set rainfall conditions.

■ The equipment is expensive.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and in particular, it is an object of the present invention to provide a raindrop impact test device that can reduce vibrations caused by the rotation of a rotor blade and can expand the test speed range. do.

[Means for Solving the Problems] The gist of the present invention is to provide a damping mechanism on a rotor blade to suppress vibrations of the rotor blade.

That is, the present invention includes a protective container, a rotary blade disposed in the protective container and having a specimen fixed to its tip, a drive motor that rotationally drives the rotary blade, and a drive motor that generates raindrops and applies the raindrops to the specimen. A raindrop collision test device for simulating raindrop collision conditions of an object flying or traveling in rain, comprising a raindrop generator that collides with a raindrop generator, wherein the rotary blade is provided with a structural damping mechanism and an aerodynamic damping mechanism. It is.

[Operations and Effects of the Invention] In the present invention, structural damping lj! is applied to the rotor blade. ! Since the structure and the aerodynamic damping mechanism are provided, vibrations caused by the rotation of the rotor can be effectively suppressed. For this reason,
The rotating body can be rotated at high speed, and the test speed range can be greatly expanded. Therefore, it is possible to conduct tests in a state similar to that of an actual aircraft, such as an aircraft radome, which is extremely effective for this type of test drawing.

[Embodiments of the invention] Hereinafter, details of the present invention will be explained with reference to illustrated embodiments.

FIG. 1 is a schematic configuration diagram showing a raindrop collision test apparatus according to an embodiment of the present invention. This device is roughly divided into protection mechanism 1.
01. It is composed of a drive mechanism 102 and a rain mechanism 103.

The anti-fill structure 101 consists of a cylindrical protective container 1, and this container 1 is divided into a lower motor room 2 and an upper rain room 3 by a partition plate 6, resulting in a so-called two-story structure. There is. The lower surface of the motor chamber 2 is the earth, and the upper surface of the rain chamber 3 is open to the atmosphere.

A swirling flow prevention window 4 and a scattering protection wall 5 are respectively provided in a portion of the container 1 corresponding to a rotating surface of a rotor blade 9, which will be described later. Here, the swirling flow prevention window 4 prevents the influence of swirling flow inside the rain chamber 3 due to the rotation of the rotor blade 9, and M
As shown in FIG. 2, it is formed by covering a part of the protective container 1 with a mesh body, for example. Further, the size H of the swirl flow prevention window 4 is determined by the relationship between the rotational speed (■) of the rotor blade 9 and the tip clearance, but depending on these selections,
The protective container 1 can be kept to a minimum scale. The scattering protection wall 5 is for preventing accidents caused by the scattering of rotating bodies, and is made of a cylindrical body arranged so as to surround the swirling flow prevention window 4. The inner surface of the scattering protection wall 5 is constructed by attaching tassels or the like to a steel plate for the purpose of absorbing the kinetic energy of the flying objects. Further, a drainage slope is provided at the bottom of the scattering protection wall 5 and the partition plate 6, and a drainage pipe 19 is connected to the lowest part thereof. This drain pipe 19 is connected to the protective container 1
It is led outside and connected to a drainage facility outside the container 1.

The drive structure 102 includes a drive motor 7 fixed to the ground,
Drive shaft 82 rotor blade 9. Bod 1o and motor control unit 11
The specimen is mounted on the front part of the 1° body. Here, the motor 7 is fixed to the ground via a vibration-insulating IFi layer 20. The drive shaft 8 is directly connected to the rotating shaft of the motor 7, and is introduced into the rain chamber 3 through the partition plate 6.

At the tip of the drive shaft 8 introduced into the rain chamber 3,
A rotary blade 9 consisting of a pair of blades is attached. rotor blade 9
As shown in FIG. 3, a pound 10 is attached to the tip thereof. A structural damping material 22 is attached to the surface of the blade surface of the rotary blade 9, and an aerodynamic damping material (fin) 21 is attached to the rear of the bond 10. Vibration of the rotor blade 9 is suppressed by these damping materials 21 and 22. In addition, sample 23
is attached to the front part of the pound 10. Here, the front part of the pound 10 can be shared with the specimen 23.

Further, a partial test piece 24 such as a flat plate may be attached to the bod 10 as a sample.

The rain mechanism 103 is installed on the upper surface of the protective container 1, that is, above the rain chamber 3, and consists of the following components. That is, injection nozzle 1
6 and a raindrop generator consisting of a nozzle position adjustment mechanism 17;
A pump 12 which is a water supply equipment outside the protective container 1. Gate valve 1
3. Pressure regulating valve 14. It is composed of a water supply pipe 15 and a water supply tank 18.

Here, the injection nozzle 16 can be set to any position in the vertical direction by a nozzle position adjustment mechanism 17. Further, the nozzle 16 can be replaced with one having a different diameter as appropriate. The amount of raindrops injected from the nozzle 16 is controlled by the pressure regulating valve 14.

In this apparatus configured in this way, the sample 23 is attached to the pond 10 of the rotor blade 9, the rotor blade 9 is rotated by the motor 7, and the rain mechanism is installed.

103 to generate raindrops from the nozzle 16 and test sample 23.
A raindrop impact test of the sample body 23 can be performed by causing the specimen 23 to collide with the raindrop.

In this case, the rain conditions in the rain chamber 3 are the diameter of the raindrops,
It is determined by the distribution, m, etc., and these conditions are determined by changes in the injection position, nozzle diameter, water supply pressure, etc.

There is a correlation between these three factors (larger raindrops are concentrated on the outside depending on the characteristics of the spray nozzle 16, the particle size changes depending on the pressure, etc.). Therefore,
Various conditions can be easily set by selecting the diameter of the nozzle 16, the vertical position of the nozzle 16, the water supply pressure, etc. in advance and conducting a preliminary test.

Raindrops sprayed in the rain chamber 3 are finally blocked by the wall of the rain chamber 3 and the partition plate 6, and are led to an external drainage facility via a drain pipe 19 provided in the partition plate 6. Rotor blade9.
Rainwater that adheres to the surface of the pond 10 and scatters on the rotating surface due to centrifugal force is similarly guided to the partition plate 6 through the scattering protection wall 5. Further, the influence of the swirling flow inside the rain seedlings 3 induced by the rotation of the rotary blade 9 and the pound 10 is avoided by the action of the swirling flow prevention window 4.

Therefore, according to the apparatus of this embodiment, the following effects (1) to (4) can be obtained.

■ Since the protective container 1 has a two-story structure consisting of a motor room 2 and a rain room 3, and the motor room 2 and rain seedlings 3 are completely separated, raindrops can be prevented from entering the motor 7. . Therefore, the motor 7 and the rotary blade 9 can be brought sufficiently close to each other, and the motor 7 and the rotary blade 9 can be directly connected. As a result, the drive motor 7 can be made more compact, and the overall structure can be made more compact.

Further, due to the function of the partition plate 6, there is an advantage that waste water treatment can be performed extremely easily.

(2) Since the swirling flow prevention window 4 is provided on the wall of the protective container 1, the influence of the swirling flow inside the rain chamber 3 can be avoided, and thereby the protective container 1 can be made smaller.

The downsizing of the protective container 1 means that the overall configuration of the device becomes smaller.
It has great practical advantages because it is easy to handle and inexpensive. In addition, since the scattering protection wall 5 is provided, accidents caused by the scattering of the rotating body can be prevented, and safety is improved.

■ Damping material 21°22 on rotor blade 9 and pound 10
Since it is provided, a large vibration damping effect can be obtained. Therefore, the rotation 19 can be rotated at high speed, thereby increasing the test speed range. This effect makes it possible to perform tests in conditions that closely resemble the actual aircraft radome, which is a great effect for this type of test equipment.

■ Rotation! Since the pound 10 is provided at the tip of the iI9, it is possible to test a relatively large specimen. In addition, since the front part of the bod 10 can be shared with the sample, there are fewer restrictions on the shape and size of the sample.

■ As a rain mechanism, nozzle 16. Since the nozzle position adjustment mechanism 17 and pressure regulating valve 14 are used, the nozzle diameter,
Control of the three elements of injection position and water supply pressure can be applied, which allows (1) setting of rainfall conditions fi7! The following effects can be obtained: (2) settings are arbitrary and easy to handle; (3) the device is compact and can be easily adapted to the size of the protective room; and (4) it can be realized at low cost.

Note that the present invention is not limited to the embodiments described above. For example, instead of providing the swirl flow prevention window 4, a fourth
As shown in Figures (a) and (b), a plurality of partition plates 25 may be provided radially from the center of the rotary blade 9. Furthermore, the number of rotary blades is not limited to one pair (two blades), and may be two or more blades for the purpose of improving the test speed. In addition, it can be applied not only to aircraft radomes but also to raindrop collision tests of various flying objects, automobiles, etc., and collision tests used for the purpose of understanding the effects of raindrops (surface damage, peeling of paint, erosion of outer panels, etc.) Of course, this is true.

In addition, various modifications can be made without departing from the gist of the present invention.

As detailed above, according to the present invention, since the rotor blade is provided with the structural damping Ij-M'=R and the aerodynamic damping mechanism, the vibration of the rotor can be suppressed, and the test speed range can be expanded. can be measured.

[Brief explanation of drawings]

Fig. 1 is a schematic diagram showing the configuration of a raindrop collision test device according to an embodiment of the present invention, Fig. 2 is a schematic diagram showing the configuration of the anti-swivel window used in the above device, and Fig. 3 is a schematic diagram showing the configuration of the anti-swivel window used in the above device. FIG. 4 is a perspective view showing the shape of a rotary blade and a bond part, FIG. 4 is a sectional view for explaining a modified example, and FIG. 5 is a schematic configuration diagram showing a conventional raindrop impact test apparatus. 1...Protective container, 2...Motor! , 3...Rain chamber, 4...Swirling flow prevention window, 5...Scatter protection wall, 6...
・Partition plate, 7... Drive motor, 8... Drive shaft, 9
...Rotary blade, 10...Bod, 11...Motor power supply, 12...Pump, 13...Gate valve, 14...
・Pressure regulating valve, 15... Water supply pipe, 16... Injection nozzle,
17... Nozzle position adjustment mechanism, 18... Water supply tank, one... Drain pipe, 20... Vibration isolation layer, 21...
・Aerodynamic damping material (fin) 22...Structural damping material, 23...Sample, 25...Partition plate, 101
・1Lill Structure, 102 ... KakuvJ Hall Structure, 103
...Rainfall mechanism. Figure 2 Figure 3 Figure 4 (a) (b)

Claims (1)

[Claims] A protective container, a rotary blade placed in the protective container and having the specimen fixed to its tip, a drive motor that rotationally drives the rotary blade, and a raindrop generator that generates raindrops and causes the raindrops to collide with the specimen. A raindrop collision test device for simulating raindrop collision conditions of an object flying or running in rain, characterized in that the rotary blade is provided with a structural damping mechanism and an aerodynamic damping mechanism. Device.