JPH0454424A - Device and method for inside and outside pressure application for structure - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a system and method for applying internal and external pressure to a structure, and in particular to testing when internal and external pressures are applied to large structures such as vehicles and airplanes. The present invention relates to a method for applying internal and external pressure to a structure suitable for performing this.

[Prior Art] A conventional pressure applying device and method directly pressurizes or depressurizes the inside of a structure 2, as shown in FIG. For example, when performing an internal pressure test on a vehicle body, air is supplied into the unit from atmospheric pressure to a predetermined pressure using a pressurizing device 4 (such as a compressor) while the vehicle body is sealed. With this conventional device and method, when pressurization and depressurization are repeatedly performed, the inside of the structure 2 must be opened to atmospheric pressure once, so there is a problem that it takes a very long time per cycle. . Further, there was a drawback that the inside of the structure 2 could not be easily observed.

Furthermore, when measuring the stress inside the structure 2, it is necessary to take the wiring from the measuring equipment outside, but there is a problem in that it requires airtight processing.

Further, when pressurizing the inside of the structure 2, it is necessary to provide safety equipment such as covering the structure 2 to prevent the structure 2 from being destroyed and destroyed.

Examples of conventional pressure application testing methods include those described in "Aerospace Engineering Handbook," edited by the Japan Society of Aeronautics and Astronautics, December 20, 1972, published by Maruzen Co., Ltd., pages 915 to 918.

[What the invention tries to solve! Title]

In the above-mentioned conventional technology, when applying internal and external pressure to a structure using gases such as air and nitrogen gas, it took a long time especially to reduce the pressure. For example, if internal pressure is added from atmospheric pressure to a sealed place such as a car body or an outer cylinder to reach a predetermined pressure state, and then the pressure is reduced to atmospheric pressure from the exhaust port, the pressure will decrease as the pressure approaches atmospheric pressure (according to In addition, when reducing pressure from atmospheric pressure to negative pressure using a vacuum pump or exhaust pump, the pumping speed was slower than when internal pressure was added, and it took time to reach the specified pressure. Therefore, when performing a fatigue test by repeatedly applying internal and external pressure to a structure, the cycle time is longer than the repetition of Higashi-Naka-Noromi, and the test takes a long time and requires a lot of effort. there were.

Furthermore, the conventional technology described above has a structure in which the inside of the structure is pressurized or depressurized, and there is a problem in that it is not possible to reproduce the same conditions as those used in vehicles, aircraft, etc.

The first object of the present invention is to add internal and external pressure to a structure that can reproduce conditions that match the usage conditions of the structure being tested.
Our goal is to provide the following.

A second object of the present invention is to provide an apparatus and method for applying internal and external pressure to a structure, which allows short pressurization and depressurization times to be applied to the structure and allows a fatigue test to be performed in a short period of time.

[Means for solving H problem]

The first purpose is to provide an outer cylinder that can accommodate a structure that is a test object, a pressurizing means that communicates with the outer cylinder through a closing means, and a pressurizing means that communicates with the outer cylinder through a closing means. This is achieved by means of pressure reduction means.

In addition, the second objective 12. an outer cylinder capable of accommodating a structure to be viewed as a test object; and a mechanism that communicates with the outer cylinder via a closing means and communicates with the inside of the structure housed in the outer cylinder via the closing means. This is achieved by a pressure means and a pressure reduction means that is communicated with the outer cylinder through a shutoff means and communicated with the inside of the structure housed in the outer cylinder through a shutoff means.

Furthermore, the second purpose is to continuously pressurize and depressurize the space between the structure and the outer cylinder, or to simultaneously pressurize the space between the structure and the outer cylinder. This is achieved by reducing the pressure in a depressurizing tank that can communicate with the outer cylinder, and reducing the pressure in the space between the structure and the outer periphery, and at the same time pressurizing the pressurizing tank that can communicate with the outer cylinder.

[For production]

The above-mentioned pressurizing means and depressurizing means act on the space between the structure and the outer periphery, that is, on the outside of the structure, so that it is possible to use a structure in which the internal pressure is approximately constant and the external pressure fluctuates. It is possible to reproduce conditions that match the situation.

According to the pressurizing means and the depressurizing means that are in slow communication with the inside of the outer cylinder and the inside of the structure, it is possible to apply a pressurizing or depressurizing pressure to the structure by the differential pressure between the inside and the outside of the structure. Pressurization and depressurization can be performed simultaneously and in a short time. Therefore, fatigue testing of structures can be performed in a short period of time.

In addition, by sequentially repeating pressurization and depressurization of the space between the structure and the outer cylinder, the pressure is transferred from the pressurized part to the depressurized state in a peeling manner, and the pressure is forcibly reduced from the depressurized state. Two fatigue tests can be carried out on the structure in a short period of time to bring the structure to the next state.

In addition, the pressure tank provided for pressurizing the space between the structure and the outer cylinder and the depressurization tank provided for reducing the pressure are depressurized when the space is pressurized. In addition, since the pressurizing tank is pressurized when the space is depressurized, the space can be pressurized and depressurized without waiting time, and the fatigue test of the structure can be carried out in a short time.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

FIG. 1 shows the configuration of an internal and external pressure applying device for a structure to which the present invention is applied. 1 is an outer cylinder surrounding the structure 2, and 3 is a passage that can go in and out of the structure 2. 4 is a pressurizing device constituted by, for example, a combustor, and 5 is a pressurizing tank maintained at a pressure higher than atmospheric pressure. 6 is a decompression tank kept at a pressure lower than atmospheric pressure, and 7 is an exhaust device for reducing the pressure inside the depressurization tank 6. 8 to ■ are valves. ν is a space created between the outer cylinder l and the structure 2, and by pressurizing or reducing the pressure in this space, external pressure and internal pressure are applied to the structure 2.

Note that the pressurization device [4 and the pressurization tank 5 are pressurization means, and the exhaust device 7 and the pressure reduction tank 6 are pressure reduction means.

Next, the operating conditions of the internal and external pressure applying device will be explained. First, the pressurizing tank 5 is pressurized to a predetermined pressure by the pressurizing device 4. On the other hand, the depressurization tank 6 is depressurized to a predetermined pressure using an exhaust system [7, such as an oil rotary vacuum pump. At this time, the valve 9 of the piping connecting the pressurizing tank 5 and the outer cylinder l
and a valve 10 of the piping connecting the outer cylinder 1 and the decompression tank 6.
is in a closed state.

Next, valve 8 and valve H are closed, and valve 9 is closed. As a result, the compressed air in the pressurizing tank 5 flows into the space ν between the outer cylinder 1 and the structure 2. If this state is maintained for a certain period of time, external pressure will act on the structure 2 which was in the atmospheric pressure state. When the spatial pressure reaches a predetermined pressure, valve 9 is closed, and then valve 10 of the exhaust system is opened. At the same time, in order to return the pressure inside the pressurizing tank 5 to the initial pressure, the valve 8 is opened and the inside of the pressurizing tank 5 is pressurized by the pressurizing device 4. When the valve IO is opened, the space seat is at a higher pressure than the pressure reducing tank 6, so the air in the space flows into the pressure reducing tank 6. If this state is maintained for a certain period of time, the pressure inside the space can be reduced to a predetermined pressure. At this time, since the pressure in the space is lower than that in the structure 2, internal pressure acts on the structure 2. When the pressure in the space chamber is reduced to a predetermined pressure, the valve 10 is closed, the valve (2) is opened, and the pressure in the pressure reduction tank 6 is reduced to the initially set pressure by the exhaust system f17. Pressurize the pressure in the pressurization tank 5 within the time it takes to reduce the pressure in the decompression tank 61 to the initial pressure! 4, the space U can be pressurized continuously if it is pressurized to the initial pressure.

By performing the above operations in a predetermined cycle, internal and external pressures can be repeatedly applied to the structure 2. FIG. 2 shows an example of pressure fluctuations in the space between the outer cylinder 1 and the structure 2, and pressure fluctuations in the pressurizing tank 5 and the depressurizing tank 6.

The imperial edict shows an example of the waveform of the pressure fluctuation in the space station, that is, the pressure fluctuation acting on the structure 2, 14 is the waveform of the pressure fluctuation in the pressurization tank, and b is the waveform of the pressure fluctuation in the depressurization tank. This is an example. The above pressure fluctuations repeat between pressures above atmospheric pressure and pressures below atmospheric pressure, but pressure fluctuations above atmospheric pressure or pressure fluctuations in low vacuum areas and high vacuum areas below atmospheric pressure are It can also be made to work. 1!Ite on the 2nd figure, 16.17.18.
19. The straight line portion indicated by J21 is the time for opening and closing the valve. This valve closing time can be shortened by installing a solenoid valve or the like which can instantaneously operate the valves 8 to 11.

According to this embodiment, since the inside of the structure @2 is always at atmospheric pressure, the temperature exceeds J! There is an advantage that the inside of the structure 2 can be easily observed by going in and out of the structure 83 during the test (temporarily interrupting pressure fluctuations). Also, when measuring the stress inside the structure 2 using a strain gauge, etc., use the same method! i3
Wiring for measurement can be carried out using the method, and no special airtight treatment is required for the wiring for measurement.

Next, another embodiment of the internal and external pressure applying device to which the present invention is applied will be described with reference to FIGS. 3 to 7. The internal and external pressure applying device shown in Fig. 3 is the outer cylinder l.

a special item 2. Over $3. The space between the outer cylinder 1 and the structure 2 is constituted by a pressurizing device 4 as a pressurizing means, a depressurizing device as a depressurizing means, and valves 8 and 11. According to this embodiment, compared to the above-mentioned embodiment, the pressurization tank, the depressurization tank, and the valves installed therewith are unnecessary! fiWiL itself can be made more compact. In addition, in this example,
Since the applied and reduced pressures are applied to the outside of the structure 2, the usage conditions can be reproduced, and since the communication path 3 is provided, it has the same effect as the first embodiment in that it is possible to check the inside. are doing.

Next, another embodiment of the method for applying internal and external pressure according to the present invention will be described with reference to FIG. The internal and external pressure applying device shown in this figure is as follows:
l! The outline of the device is almost the same as the embodiment shown in Figure 3, but in this embodiment, both the inside of the structure 2 and the air passage between #l4e2 and the outer cylinder 1 can be pressurized and depressurized. It is something. Next, a method of applying internal and external pressure according to this embodiment will be explained. When pressurizing structure 2, pressurize! ! space n by 14
When pressurized, the decompression device becomes 8FI#! 7 to reduce the pressure inside the structure @2. At this time, the structure 2 is in a state where external pressure is applied. On the other hand, in order to bring the structure 2 into a state where internal pressure is applied, the inside of the structure IJ2 is pressurized by the pressurizing device 4, and at the same time, a decompression device is used! 7 to depressurize the air tank. This operation is performed by opening and closing the valves 8a, 8b and the valves Lla, llb, and pressurizes and depressurizes the structure 2. According to this embodiment, the pressurization time and depressurization time can be shorter than those of the embodiment shown in FIG. 3.

Therefore, the number of repetitions of pressurization and depressurization can be increased in a short period of time. Furthermore, the entire device can be made compact.

Next, FIG. 5 shows an example of application of the outer cylinder construction, which has a structure in which the inside of the outer cylinder I can be partitioned into a plurality of arm chambers. By partitioning the outer cylinder l into a plurality of parts by the partition plate B, pressure vibration can be applied depending on the size of the structure.

FIG. 6 shows an internal and external pressure adding device in which a pressurizing tank 5 and a depressurizing tank 6 are arranged in one container. As a result, the area occupied by the entire apparatus can be reduced, and the respective volumes of the pressurizing tank 5 and the depressurizing tank 6 can be arbitrarily changed by means of the movable partition plates. In addition, the pressure piece tank 5 and the pressure reduction tank 6
By providing the above-mentioned -!, it is possible to shorten the K test time. l
! The same effect as in the example can be achieved.

FIG. 7 shows an example of application of the outer cylinder l. The outer cylinder 1 is joined by flanges so that it can be divided into a plurality of parts. This allows the volume of the outer cylinder 1 to be increased arbitrarily depending on the size and length of the structure.

〔Effect of the invention〕

According to the present invention, it is possible to reproduce conditions that match the usage conditions of the structure that is the wrinkled body to be tested.

Further, according to the present invention, the time for applying pressure and depressurization to a structure can be shortened, and a fatigue test can be performed in a short period of time.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing an example of an internal and external pressure applying device according to the present invention; FIG. 2 is a graph showing pressure fluctuations of the outer cylinder, pressurization tank, and depressurization tank shown in FIG. 1; FIG. , 4th
6 and 6 are circuit diagrams showing other embodiments of the internal and external pressure applying device according to the present invention, and FIGS. 5 and 7 are respectively other embodiments of the outer cylinder used in the internal and external pressure applying device according to the present invention. FIG. 8 is a circuit diagram showing a conventional pressure adding device g. l...Outer cylinder, 2...Structure, 3...
... Passageway, 4... Pressurizing device, 5... Pressurizing tank, 6... Depressurizing tank, 7... Depressurizing device agent Patent attorney Katsoo Ogawa Figure Time 41j - Steam '43 Figure Supply Air Figure Otsu Figure Flash Figure Jli Air Figure 18 Exhaust

Claims (1)

[Scope of Claims] 1. An outer cylinder capable of housing a structure as a test object, a pressurizing means communicating with the outer cylinder via a closing means, and communicating with the outer cylinder via a closing means. 1. A device for applying internal and external pressure to a structure, characterized in that the device comprises: 2. In the device for applying internal and external pressure to a structure according to claim 1,
A device for applying internal and external pressure to a structure, characterized in that a communication portion is provided for communicating between the inside of the structure and the outside of the outer cylinder. 3. In the device for applying internal and external pressure to a structure according to claim 1,
The pressurizing means is configured by communicating a pressurizing device and a pressurizing tank via a closing means, and the pressurizing tank is communicated with an outer cylinder via the closing means. Internal and external pressure adding device. 4. In the device for applying internal and external pressure to a structure according to claim 1,
The pressure reduction means is configured by communicating a pressure reduction device and a pressure reduction tank via a closure means, and the pressure reduction tank is communicated with an outer cylinder via the closure means. Additional equipment. 5. In the device for applying internal and external pressure to a structure according to claim 1,
An apparatus for applying internal and external pressure to a structure, wherein the pressurizing means is communicated with the inside of the structure via a closing means. 6. In the device for applying internal and external pressure to a structure according to claim 1,
An apparatus for applying internal and external pressure to a structure, wherein the pressure reducing means is communicated with the inside of the structure via a closing means. 7. In the device for applying internal and external pressure to a structure according to claim 1,
A device for applying internal and external pressure to a structure, wherein the structure is a vehicle body. 8. An outer cylinder capable of accommodating a structure as a test object, communicated with the outer cylinder via a closing means, and communicated with the inside of the structure housed in the outer cylinder via a closing means. a pressurizing means that communicates with the outer cylinder via a closing means, and
An apparatus for applying internal and external pressure to a structure, characterized in that it comprises a pressure reducing means that communicates with the inside of the structure housed in the outer cylinder via a closing means. 9. A method for applying internal and external pressure to a structure, which comprises sequentially repeating pressurization and depressurization of a space between a structure to be tested and an outer cylinder housing the structure. 10. Pressurize the space between the structure to be tested and the outer cylinder housing the structure, and at the same time reduce the pressure in a depressurizing tank that can communicate with the outer cylinder, and pressurize the space between the structure and the outer cylinder. 1. A method for applying internal and external pressure to a structure, the method comprising reducing the pressure in a space between the outer cylinder and simultaneously pressurizing a pressurizing tank that can communicate with the outer cylinder.