KR102321566B1 - Model submerged body having strut support structure - Google Patents

Abstract

A model forfeit body having a strong strut support structure is disclosed. The model forfeit body, it is characterized in that it comprises a body, and a strut support structure disposed on the upper end of the body.
According to the present invention, by attaching a double strut having a cross-sectional shape of a blade with a minimized flow effect, it is possible to develop a forfeiting body support method that minimizes the change in countercurrent on the propeller surface and structural stability.

Description

Model submerged body having strut support structure

The present invention relates to a model forfeit body, and more particularly, to a model forfeit body having a double strut support structure that minimizes the effect of backflow.

Because the underwater vehicle operates at a higher speed than the high-speed vessel, the large cavitation tunnel model test is also performed at high speed (about 10.0m/s or more). It is constructed in the form of a strong skeletal structure, but is usually supported by a single strut. Therefore, if damage occurs, there is a possibility that it may lead to a major accident. That is, it may be a large tunnel structure damage, a drive pump damage, or the like.

In addition, a noise test is required, and if vibration occurs in the underwater vehicle itself, a problem occurs in the measurement data, so strong support is required. Therefore, for the model test, the installation of a strut to support the forfeited body is required. In order for the model test to be performed at high speed, it must have a strong support structure and a shape design that minimizes the change in the backflow flowing into the propeller surface.

1. Korea Patent Registration No. 10-1885783 (Registration Date: July 31, 2018)

The present invention has been proposed to solve the problems according to the above background art, and an object of the present invention is to provide a model forfeit body having a strong strut support structure.

Another object of the present invention is to provide a model forfeit body having a strut support structure that minimizes the effect of backflow.

The present invention provides a model forfeiture body having a strong strut support structure to achieve the object presented above.

The model forfeited body is

body; and

and a strut support structure disposed on the upper end of the body.

In addition, the strut support structure is characterized in that it is a double strut support structure.

In addition, the double strut support structure may include a first support portion disposed on the upper end of the body; a second support portion disposed on the upper end of the body and spaced apart from the first support portion; and a plate coupled to one end of the first support part and the second support part.

In addition, the first support portion and the second support portion is characterized in that the wing cross-sectional shape.

In addition, the thickness of the first support part is greater than the thickness of the second support part, and the thickness of the second support part is 70% of the thickness of the first support part.

In addition, the cord length of the first support part is greater than the cord length of the second support part, and the cord length of the second support part is 70% of the cord length of the first support part.

In addition, the second support portion is characterized in that it is installed closer than the first support portion from the center of gravity of the body.

In addition, the first support part exhibits a stress of 100 Mpa or less, and the second support part exhibits a stress of 152 Mpa or less.

In addition, a resistance dynamometer coupled to the other ends of the first support part and the second support part is characterized in that it is installed inside the body.

In addition, thick plates are attached to both ends of the first support part and the second support part.

In addition, the 1-1 thick plate of the thick plate is assembled and connected to the support plate connecting the deck of the resistance dynamometer, and the 1-2 thick plate of the thick plate is assembled and connected to the plate.

In addition, the 2-1 thick plate of the thick plate is assembled and connected to the support plate connecting the deck of the resistance dynamometer, and the 2-2 thick plate of the thick plate is assembled and connected to the plate.

In addition, reinforcing plates are attached to both ends of the first support part and the second support part to disperse stress.

In addition, the reinforcing plate is characterized in that the wing is integrally formed on the circumferential surface of the rectangular thick plate having a hollow.

According to the present invention, it can be seen that there is almost no change in countercurrent, which is the result of performing CFD (Computational Fluid Dynamics) analysis on the propeller surface.

In addition, as another effect of the present invention, it is possible to develop a forfeited body support method that minimizes the change in counterflow on the propeller surface and structural stability by attaching a double strut with a cross-sectional shape of a blade that minimizes the flow effect. .

1 is a perspective view of a model forfeiture body having a general single strut support structure.
2 is a perspective view of a model forfeiture body having a double strut support structure according to an embodiment of the present invention.
3 is a conceptual diagram of a model forfeiting body installed in a large cavitation tunnel according to an embodiment of the present invention.
4 is a conceptual diagram illustrating the configuration of a model forfeit body according to an embodiment of the present invention.
FIG. 5 is a side view of the double strut support structure shown in FIG. 4 .
6 is a front view of the double strut support structure shown in FIG. 5 .
FIG. 7 is a plan view of the heavy plate shown in FIG. 5 .
FIG. 8 is a plan view of the thick plate shown in FIG. 5 .
9 is a plan view of the support plate shown in FIG. 5 .
10 is a cross-sectional view of the support plate shown in FIG.
11 is an example of a result screen showing a comparative analysis result of a counterflow of a propeller surface according to the presence or absence of a strut support structure.

The above-described objects, features and advantages will be described below in detail with reference to the accompanying drawings, and accordingly, those of ordinary skill in the art to which the present invention pertains will be able to easily implement the technical idea of the present invention. In describing the present invention, if it is determined that a detailed description of a known technology related to the present invention may unnecessarily obscure the gist of the present invention, the detailed description will be omitted. Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals are used to indicate the same or similar components.

1 is a perspective view of a model confiscated body 100 having a typical single strut support structure 120 . Referring to FIG. 1 , the model confiscated body 100 has a body 110 and a single strut support structure 120 disposed on the upper end of the body 110 .

In general, in the case of a confiscated body such as a submarine, the strut support structure 120 is installed at a sail position as shown in FIG. 1 in order to minimize the effect of backflow.

If it is supported by connecting upward from the inside of the sail in the form of a thinner blade cross-section, it is possible to minimize the change in the countercurrent flowing into the propeller surface. To this end, the strut support structure 120 includes a support portion 121 having one end fixed to the body 110 , and a plate 122 connected to the other end of the support portion 121 .

However, as shown in Figure 1, when the sail (sail) is installed on the upstream side of the hull, the single strut support structure may cause a problem in the strong installation.

Therefore, for such a strong installation, a double strut support structure can be implemented.

2 is a perspective view of a model confiscated body having a double strut support structure 220 according to an embodiment of the present invention. Referring to FIG. 2 , the double strut support structure 220 is a first support portion 221 disposed on the upper end of the body 110 , a first support portion 221 and a straight line behind the first support portion 221 at regular intervals. It may be configured to include a plate 223 coupled to the end of the second support 222, the first support 221, and the second support 222 disposed thereon.

The first support part 221 is installed on the bow side of the top surface of the model confiscated body 200 . The first support 221 is thicker than the second support 222 . That is, a large counterflow with respect to the flow rate is generated by the first support part 221 , and then a small counterflow is generated by the second support part 222 . A metal material is used as a material of the body 110 , the first support part 221 , and the second support part 222 , but engineering plastics are also possible. In particular, the material of the first support part 221 and the second support part 222 is soft iron, and the yield stress may be about 250 Mpa. In general, for the single strut support structure shown in FIG. 1, the maximum stress is about 282 Mpa. Therefore, improvement is required while the yield stress is exceeded, and in order to satisfy this, a double strut support structure as shown in FIG. 2 is required.

3 is a conceptual diagram of a model confiscated body 200 installed in a large cavitation tunnel according to an embodiment of the present invention. In other words, FIG. 3 shows a state in which the model forfeit body 200 having a double strut support structure is installed in the test part 310 of a large cavitation tunnel. Referring to FIG. 3 , the model forfeited body 200 is positioned in the test part 310 formed in the large cavitation tunnel. Of course, a watertight space is formed inside the test unit 310 . The trunk installation part 320 is positioned at the upper end of the test part 310 , and the support structure 330 is installed in the trunk installation part 320 .

4 is a conceptual diagram of a model forfeit body 200 according to an embodiment of the present invention. Referring to FIG. 4 , the first support part 221 is installed on the bow side of the body 110 , and the second support part 222 is installed at regular intervals from the first support part 221 . The first support 221 is installed in the sail 440 of a tower-like structure formed on the surface of the body 110 . That is, a portion of the outer circumferential surface of the first support part 221 is inserted and wrapped inside the sail 440 .

The model confiscated body 200 weighs about 1.5 tons except for the strut support structure 220 , and the center of gravity is located near the center of the body 110 . A resistance dynamometer 410 is configured to measure the resistance of the model confiscated body 200 . The resistance dynamometer 410 is connected to the ends of the first support 221 and the second support 222 . That is, the model confiscated body 200 is supported by the resistance dynamometer 410 , and the resistance dynamometer 410 is connected to the ends of the first support part 221 and the second support part 222 .

The resistance dynamometer 410 may be a coulometric dynamometer using a strain gauge type load cell and a thousand pyeong dynamometer capable of high-precision measurement. The resistance dynamometer 410 is designed to support the weight of about 5 tons, and can measure the load applied in the X and Y directions up to ±5,000N. This is disclosed in Korean Patent No. 10-1160617 (registration date: 2012.06.21), so a further description will be omitted.

4, a propeller 430 is installed on the rear side of the body 110, and a dynamometer ( 420) is installed. The model confiscated body 200 is disposed based on the propeller installation surface 400 . The propeller installed on the stern to propel the confiscated body is located on the propeller installation surface 400 .

FIG. 5 is a side view of the double strut support structure 220 shown in FIG. 4 . Referring to FIG. 5 , 1-1 and 1-2 thick plates 511-1 and 512-1 are positioned at both ends of the first support part 221 . The 1-1 thick plate 511-1 is connected to the upper surface of the support plate 510 , and the 1-2 thick plate 511-1 is assembled and connected to the lower surface of the plate 223 . In addition, 2-1 and 2-2 thick plates 511-2 and 512-2 are also located at both ends of the second support part 222 . The 2-1 thick plate 511 - 2 is connected to the upper surface of the support plate 510 , and the 2 - 2nd thick plate 512 - 2 is assembled and connected to the lower surface of the plate 223 . The bottom surface of the support plate 510 is assembled and connected to the surface of the deck 530 of the resistance dynamometer 410 .

In the case of the double strut support structure 220 , the maximum stress is 152 Mpa, and the maximum stress appears in the second support portion 222 installed close to the center of gravity. That is, a stress of 152 Mpa or less appears. On the other hand, in the case of the first support part 221, a stress of 100 Mpa or less appears. Therefore, it can be seen that the double strut support structure 220 is a structurally stable installation.

5, the support plate 510 connecting the support parts 221 and 222 and the deck 530 of the resistance dynamometer 410 may be a thick plate having a thickness of about 30 mm. In addition, the 1-1 and 2-1 thick plates 511-1 and 511-2 may be assembled and connected to the support plate 510 by a screw bolting method. That is, it can be assembled by fastening from the support plate 510 to the 1-1 and 2-1 thick plates 511-1 and 511-2 using screw bolts. Of course, the support plate 510 may also be assembled and connected to the deck 530 through a screw bolting method.

Of course, the 1-1 and 1-2 thick plates 511-1 and 512-1 may be attached to the end of the first support part 221 by welding. The 2-1 and 2-2 thick plates 511-2 and 512-2 may also be joined to the end of the second support part 222 by welding. In addition to such welding, it may be integrally formed. That is, it is possible to manufacture using a mold.

6 is a front view of the double strut support structure shown in FIG. 5 . Referring to FIG. 6 , a reinforcing plate 610 having a thickness of about 12 mm is attached by welding for stress distribution. The reinforcing plate 610 has a structure in which a plurality of wings 612 are integrally formed on the circumferential surface of the rectangular thick plate 611 with a hollow.

FIG. 7 is a plan view of the thick plate 511-1 shown in FIG. 5 , and FIG. 8 is a plan view of the thick plate shown in FIG. 5 . 7 and 8 , a through hole 710 for inserting a screw (not shown) is formed. The through-holes 710 are formed vertically at regular intervals. The through hole 710 has a different pie (Φ) depending on the size of the thick plate. That is, it can be 25 pi or 20 pi.

The first support part 221 and the second support part 222 have a wing cross-sectional shape 720 to minimize flow change, and the second support part 222 has a cord length and thickness of about 70 compared to the first support part 221 . % is about The cord length 501 is the length of the wing cross-sectional shape 720 .

FIG. 9 is a plan view of the support plate 510 illustrated in FIG. 5 , and FIG. 10 is a cross-sectional view of the support plate 510 illustrated in FIG. 9 . 9 and 10 , the screw bolt 910 is fastened. There is also a block 920 connected to the deck 530 of the resistance dynamometer 410 . That is, since the second support 222 is installed at the rear of the center of the resistance dynamometer 410 , it is a situation in which a larger load needs to be supported than that of the first support 221 . Accordingly, a block 920 for connection with the deck 530 is additionally required. A through hole 1010 is also formed in the support plate 510 . In the case of this through-hole 1010, only a part is indicated.

11 is an example of a result screen showing a comparative analysis result of a counterflow of a propeller surface according to the presence or absence of a strut support structure. Referring to FIG. 11 , the problem of the double strut support structure is the change in the countercurrent of the propeller surface. By the way, CFD (Computational Fluid Dynamics) analysis was conducted for the case where it was installed without such a strut support structure in a large cavitation tunnel (w/o strut) and when it was installed with a double strut support structure (w/ strut) as shown in FIG. 3 . carried out. As a result of the analysis, as shown in FIG. 11 , it can be seen that although the CFD analysis is performed on the propeller surface, there is little change in the countercurrent.

100,200: Model forfeited body
110: body
120: single strut support structure
220: double strut support structure
221: first support
222: second support
223: plate

Claims (14)

body 110; and
Strut support structure 220 disposed on the upper end of the body 110; includes,
The strut support structure 220,
a first support part 221 having one end disposed on the bow side of the top surface of the body 110;
a second support part 222 having one end disposed on the upper end of the body 110 and disposed on a straight line behind the first support part 221 at a predetermined interval from the first support part 221; and
and a plate 223 coupled to the other end of the first support part 221 and the second support part 222;
The second support 222 is installed closer than the first support 221 from the center of gravity of the body 110,
The thickness of the first support part 221 is greater than the thickness of the second support part 222, and the thickness of the second support part 222 is 70% of the thickness of the first support part 221,
The cord length 501 of the first support part 221 is greater than the cord length of the second support part 222 , and the cord length 501 of the second support part 222 is the cord length 501 of the first support part 221 . 70% of the length,
The first support portion 221 and the second support portion 222 have a wing cross-section 720,
A portion of the outer peripheral surface of the first support part 221 is inserted and wrapped inside the sail 440 formed on the surface of the body 110,
The first support 221 is thinner than the sail 440,
With respect to the flow rate, the counterflow is largely generated by the first support part 221, and then the counterflow is small by the second support part 222,
A resistance dynamometer 410 coupled to the other end of the first support 221 and the second support 222 is installed inside the body 110,
Thick plates 511-1, 512-1, 511-2, 512-2 are attached to both ends of the first support part 221 and the second support part 222,
Among the thick plates 511-1, 512-1, 511-2, and 512-2, the 1-1 thick plate 511-1 is assembled and connected to the support plate 510 for connecting the deck 530 of the resistance dynamometer 410, The first and second plates 512-1 among the plates 511-1, 512-1, 511-2, and 512-2 are assembled and connected to the plate 223,
The second plate (511-2) of the plate (511-1, 512-1, 511-2, 512-2) is assembled and connected with the support plate (510) connecting the deck (530) of the resistance dynamometer (410) , a 2-2 second plate 512-2 among the plates 511-1, 512-1, 511-2, and 512-2 is assembled and connected to the plate 223,
The bottom surface of the support plate 510 is assembled and connected to the surface of the deck 530,
A model forfeit body having a strut support structure, characterized in that a reinforcing plate (610) is attached to both ends of the first support part (221) and the second support part (222) for stress distribution.
delete delete delete delete delete delete The method of claim 1,
The first supporting part 221 exhibits a stress of 100 Mpa or less, and the second supporting part 222 exhibits a stress of 152 Mpa or less.
delete delete delete delete delete The method of claim 1,
The reinforcing plate (610) is a model forfeit body having a strut support structure, characterized in that the hollow square plate (611) and the wings (612) are integrally formed on the circumferential surface of the square plate (611).

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