Resistance measurement system for ship model testing suitable for various sea conditions

Abstract

The present invention relates to a resistance measurement system for testing ship models that is applicable to various sea surface conditions, and is characterized in that it includes: a resistance measurement unit, which is connected and installed in a towing rod extending from a model ship, and measures the resistance acting on the model ship in still water and in waves through a force sensor; a load buffer unit, which is arranged in a fixing device extending from a measurement frame of a towing vehicle used to tow the model ship, and elastically supports the resistance measurement unit through an elastic component, thereby buffering the load applied to the resistance measurement unit; and a balance point correction force application unit, which is arranged in the measurement frame of a detaching vehicle used to tow the model ship, and applies a load to the resistance measurement unit through a cable connection, thereby inducing the resistance measurement unit coupled to the load buffer unit to a back and forth rocking balance point under the waves.

Description

Technical Field

[0001] The present invention relates to a resistance measurement system for model testing, and in particular to a resistance measurement system for ship model testing that is applicable to various sea surface conditions and has very small heave and pitch motions and can utilize a single system to perform both additional resistance testing in waves in a short-wavelength region where the wavelength is shorter than the length of the ship's hull, and resistance testing in still water in the absence of waves. Background Art

[0002] Ships mainly sail on the sea, and the size, direction and shape of waves in the sea are very diverse and complex.

[0003] In addition, when a ship is sailing on the sea, it is not only affected by the waves, but also by the wind and tides.

[0004] Therefore, when designing a ship, it is advisable to consider the effects of waves, wind, tides, etc. that the ship may experience during navigation.

[0005] However, since it is impossible to actually test the intended ship in the sea, a model ship that is scaled down to the actual design can be prepared and placed in a towing tank that provides an environment similar to the sea to conduct various model tests, thereby evaluating the hydrodynamic performance of the actual ship.

[0006] At this time, the model test includes resistance testing.

[0007] The resistance test is an essential test for evaluating the linear performance and speed horsepower performance of a model ship. It can measure the resistance acting on the hull during the towing of the model ship. The resistance acting on the hull is measured by a resistance dynamometer.

[0008] In addition, the resistance test also includes additional resistance testing in waves.

[0009] The additional resistance test in waves is a test implemented because people are paying more and more attention to improving the energy efficiency of ships. It can quantify and evaluate the energy efficiency of ships in non-still water waves, and the resistance acting on the hull is measured by a resistance dynamometer.

[0010] Among them, conventional resistance measurement systems, including a resistance dynamometer disclosed in Korean Utility Model Registration No. 20-0307645, are generally divided into systems dedicated to still water and systems dedicated to sea waves.

[0011] Therefore, when a still water test and a wave test are simultaneously performed during a model test, it is necessary to replace the measuring device during the test, thereby causing unnecessary trouble.

[0012] That is, the model test performed in the towing tank usually measures the physical quantities of the model ship at a certain speed. Therefore, it is necessary to be equipped with a section for accelerating the model ship from a stationary state to a certain speed and a section for decelerating from a certain speed to a stationary state. In order to protect the resistance dynamometer from the image of the inertial force acting on the model ship in the acceleration and deceleration section of the model ship, the clamp system can be used to tow the model ship through the clamp in the acceleration and deceleration section, and the resistance dynamometer can be used to detach the model ship in the constant speed section. Therefore, in order to perform the test in the waves after the test in still water is completed, it is necessary to replace and install the resistance dynamometer and the entire clamp system, which causes unnecessary trouble.

[0013] Furthermore, because the dedicated resistance measurement systems for still water and waves use different sensors, the test results may be more unreliable.

[0014] For the reasons mentioned above, the relevant field is exploring a solution in which the heave and pitch motions are very small and a system can be used to perform additional resistance tests in waves in a short-wavelength region where the wavelength is shorter than the hull length, as well as resistance tests in still water without waves. However, no satisfactory results have been obtained so far.

[0015] Prior art literature

[0016] Patent Literature

[0017] (Patent Document 1) Korean Utility Model Registration No. 20-0307645 Summary of the Invention

[0018] The present invention aims to solve the problems existing in the prior art as described above, and its purpose is to provide a resistance measurement system for model testing, and in particular to a resistance measurement system for ship model testing, which has very small heave and pitch motions and can use a single system to perform additional resistance testing in waves in a short-wavelength region where the wavelength is shorter than the hull length, as well as resistance testing in still water in the absence of waves, and is applicable to various sea surface conditions.

[0019] To achieve the above-mentioned objectives, the present invention provides a resistance measurement system for ship model testing applicable to various sea surface conditions, characterized by comprising:

[0020] A resistance measuring unit is connected and installed in a towing rod extending from the model ship, and measures the resistance acting on the model ship in still water and in waves through a force sensor; a load buffering unit is arranged in a fixing device extending from a measuring frame of a towing vehicle used to tow the model ship, and elastically supports the resistance measuring unit through elastic components, thereby buffering the load applied to the resistance measuring unit; and a balance point correction force applying unit is arranged in the measuring frame of a detaching vehicle used to tow the model ship, and applies a load to the resistance measuring unit through a cable connection, thereby inducing the resistance measuring unit coupled to the load buffering unit to a back and forth rocking balance point under the waves.

[0021] The resistance measuring unit includes: a main body, which supports the force sensor in a movable manner; and a coupling component, which is threadedly engaged with the main body and rotates forward and backward to adjust the forward and backward movement range of the force sensor on the main body.

[0022] The resistance measuring unit includes a connecting component coupled to one end of the force sensor and coupled to a towing rod extending from the model ship.

[0023] The force sensor includes, on one side thereof, a ring component to which the cable extending from the balance point correction force applying unit can be connected.

[0024] The load buffer unit includes: a main body equipped with a plurality of guide rods for mounting the elastic component; and a movable component arranged on the guide rods in a manner that can slide back and forth, with one end and the other end in the length direction respectively contacting the elastic component.

[0025] The load buffer unit includes a pulley configured to convert a traveling direction of the cable extending from the balance point correction force applying unit.

[0026] The balance point correction force applying unit includes: a main body having a horizontal frame connected between two vertical frames; and pulleys configured at multiple positions on the main body to convert the travel direction of the cable.

[0027] The balance point correction force applying unit includes a scale portion that applies a preset load to the cable by selectively combining with weights of different loads.

[0028] The resistance measurement system for ship model testing applicable to the present invention, which is applicable to various sea surface conditions, includes a balance point correction force application unit. Therefore, the resistance measuring unit combined with the load buffer unit can be induced to the forward and backward rocking balance point under the waves through the balance point correction force application unit, thereby not only smoothly performing a still water resistance test in a state without waves, but also smoothly performing an additional resistance test in waves. Therefore, even when performing still water tests and tests in waves at the same time, the inconvenience of having to replace the measuring device during the test can be avoided.

[0029] In addition, the resistance measurement system for ship model testing applicable to various sea surface conditions of the present invention includes a load buffer unit. Therefore, the load buffer unit can be used to elastically support the resistance measuring unit and thereby buffer the load applied to the resistance measuring unit, thereby avoiding damage to the resistance measuring unit due to excessive load applied. Therefore, not only can the resistance test in still water without waves be smoothly performed, but the additional resistance test in waves can also be smoothly performed. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram showing a mode in which the resistance measurement system for ship model testing applicable to various sea surface conditions according to the present invention is applied to a model ship.

[0031] Figure 2 This is an illustrative diagram illustrating an installation configuration of a resistance measurement system for ship model testing to which the present invention is applied and which is applicable to various sea surface conditions.

[0032] Figure 3 This is an illustrative diagram from another direction illustrating the installation form of the resistance measurement system for ship model testing to which the present invention is applied and which is applicable to various sea surface conditions.

[0033] Figure 4 This is a perspective view for explaining the structure of a resistance measurement unit in a resistance measurement system for ship model testing applicable to various sea surface conditions, to which the present invention is applied.

[0034] Figure 5 This is a perspective view for explaining the structure of a load buffer unit in a resistance measurement system for ship model testing applicable to various sea surface conditions, to which the present invention is applied.

[0035] Figure 6 This is a perspective view for explaining the structure of a balance point correction force applying unit in a resistance measurement system for ship model testing applicable to various sea surface conditions, to which the present invention is applied.

[0036]

Explanation of symbols

[0037] 10: Resistance measurement unit

[0038] 11: Force sensor

[0039] 11a: protrusion

[0040] 11b: Ring component

[0041] 12: Main body

[0042] 12a: Open Section

[0043] 12b: Support sheet

[0044] 13: Combined components

[0045] 14: Connecting parts

[0046] 20: Load buffer unit

[0047] 21: Elastic components

[0048] 22: Main body

[0049] 22a: Guide rod

[0050] 23: Moving Parts

[0051] 24: Pulley

[0052] 30: Parallel point correction force application unit

[0053] 31: Cable

[0054] 32: Main body

[0055] 32a: Vertical Frame

[0056] 32b: Horizontal frame

[0057] 33: Pulley

[0058] 34: Scales

[0059] 34a: Cable

[0060] 100: Model Ship

[0061] 110: Tow bar

[0062] 200: Measurement Framework

[0063] 210: Fixtures

[0064] A: Resistance measurement system DETAILED DESCRIPTION

[0065] Next, the present invention will be described in detail with reference to the accompanying drawings.

[0066] like Figures 1 to 3 As shown, the resistance measurement system A for ship model testing applicable to various sea surface conditions according to the present invention includes a resistance measurement unit 10 , a load buffer unit 20 and a balance point correction force applying unit 30 .

[0067] The resistance measuring unit 10 of the present invention is connected to and installed in a towing rod 110 extending from the model ship 100 , and measures the resistance acting on the model ship 100 in still water and in waves through a force sensor 11 .

[0068] At this time, the resistance measurement unit 10 includes a main body 12 that supports the force sensor 11 in a manner that it can move forward and backward (left and right as shown in the figure), so that the force sensor 11 can move forward and backward with the help of the main body 12.

[0069] In addition, the resistance measuring unit 10 includes a coupling component 13 that is threadedly engaged with the main body 12 and rotates forward and backward to adjust the forward and backward movement range of the force sensor 11 on the main body 12. The forward and backward movement range of the force sensor 11 can be reduced by reducing the distance between the front end of each coupling component 13 and the force sensor 11, thereby preventing the force sensor 11 from being damaged due to excessive forward and backward movement.

[0070] The coupling components 13 can be respectively threadedly engaged with a pair of support pieces 12b protruding from the open portion 12a of the main body 12, thereby contacting the protruding portion of the force sensor 11 whose front end moves back and forth between the support pieces 12b.

[0071] In addition, the resistance measuring unit 10 may further include a connecting component 14 coupled to one end of the force sensor 11 and coupled to the towing rod 110 extending from the model ship 100 , whereby the resistance measuring unit 10 may be connected to the model ship 100 via the connecting component 14 .

[0072] Furthermore, a ring member 11 b may be provided on one side of the load cell 11 , and a cable 31 extending from the balance point correction force applying unit 30 may be connected to the ring member 11 b , thereby connecting the resistance measurement unit 10 and the balance point correction force applying unit 30 .

[0073] The load buffer unit 20 of the present invention is arranged in a fixing device 210 extending from a measuring frame 200 of a towing vehicle (not shown) used to tow the model ship 100, and elastically supports the resistance measuring unit 10 through an elastic component 21, thereby buffering the load applied to the resistance measuring unit 10.

[0074] At this time, the load buffer unit 20 may include a main body 22 equipped with a plurality of guide rods 22 a , whereby the elastic member 21 may be installed by inserting the elastic member 21 into the front end and the rear end of each guide rod 22 a .

[0075] In addition, the load buffering unit 20 may include a movable component 23 that is configured on the guide rod 22a in a manner that can slide back and forth, and one end and the other end in the length direction are respectively in contact with the elastic component 21. Hereby, the resistance measuring unit 10 can be combined with the movable component 23 and the forward and backward movement of the resistance measuring unit 10 can be achieved by sliding the movable component 23. Moreover, when the resistance measuring unit 10 slides back and forth, the load applied to the resistance measuring unit 10 can be buffered by making the movable component 23 contact with one of the elastic components 21.

[0076] In addition, the load buffer unit 20 may include a pulley 24 that converts the travel direction of the cable 31 by being configured at one end of the main body 12, whereby the cable 31 extending from the balance point correction force application unit 30 can be converted in direction after passing through the pulley 24 of the load buffer unit 20 and connected to the resistance measuring unit 10, more specifically, connected to the ring component 11b of the force sensor 11.

[0077] The balance point correction force application unit 30 of the present invention is arranged in the measuring frame 200 of the untowing vehicle used to tow the model ship 100, and is connected to apply a load to the resistance measuring unit 10 through a cable 31, thereby inducing the resistance measuring unit 10 combined with the load buffer unit 20 to the forward and backward rocking balance point under the waves (the middle part between one end and the other end of the load buffer unit in the longitudinal direction).

[0078] At this time, the balance point correction force applying unit 30 may include a main body 32 with a horizontal frame 32b connected between two vertical frames 32a on both sides, thereby being connected and installed on the measuring frame 200 by fixing the lower ends of the vertical frames 32a on both sides of the main body 12 to the measuring frame 200.

[0079] In addition, the balance point correction force applying unit 30 may include pulleys 33 arranged at multiple positions of the main body 12, whereby the cable 31 extending from the scale part 34 described below can be converted in direction through the pulley 33 and connected to the resistance measuring unit 10 located below it.

[0080] In addition, the balance point correction force application unit 30 may also include a scale part 34 that is arranged on one side of the main body 32 and applies a predetermined load to the cable 31 by selectively combining with a weight 34a of different loads, thereby applying a load corresponding to the scale of the waves to the cable 31 by selectively combining the weight 34a to the scale part 34.

[0081] Next, a method of measuring resistance using the resistance measurement system A for ship model testing applicable to various sea surface conditions to which the present invention is applied will be described in detail.

[0082] In the present invention, the resistance measuring unit 10 is connected and installed in the towing rod 110 extending from the model ship 100 .

[0083] Therefore, when the model ship 100 is towed, the resistance acting on the model ship 100 will be transmitted to the load cell 11 of the resistance measurement unit 10 , so that the resistance acting on the towed model ship 100 can be measured with the help of the load cell 11 .

[0084] At this time, the force sensor 11 installed on the main body 12 in a movable manner may be damaged due to collision with the main body 12 when the range of movement is too large, making it difficult to measure the resistance acting on the model ship 100.

[0085] However, the resistance measuring unit 10 in the present invention is as follows Figure 4 As shown, it includes a coupling component 13 that is threadedly engaged with the main body 12 and rotates forward and backward to adjust the forward and backward movement range of the force sensor 11 on the main body 12, so that the forward and backward movement range of the force sensor 11 can be reduced by reducing the interval between the front end of each coupling component 13 and the force sensor 11, thereby preventing excessive forward and backward movement of the force sensor 11, thereby preventing the force sensor 11 from being damaged due to excessive forward and backward movement and smoothly measuring the resistance acting on the model ship 100.

[0086] In addition, the resistance measuring unit 10 in the present invention is elastically supported by the load buffer unit 20 .

[0087] That is, the main body 12 of the resistance measuring unit 10 is coupled to a movable part 23 that is slidably arranged on a guide rod 22a provided on the main body 22 of the load buffer unit 20, so that the elastic part 21 contracts by making the movable part 23 that can slide back and forth contact with one of the elastic parts 21 installed on the guide rod 22a, thereby elastically supporting the resistance measuring unit 10 coupled to the movable part 23.

[0088] In this way, the load applied to the resistance measurement unit 10 can be buffered by the load buffering unit 20 , thereby further preventing the resistance measurement unit 10 from being damaged due to excessive load.

[0089] At this time, the elastic member 21 is as Figure 5As shown, elastic support can be achieved by inserting and installing the front end and the end of the guide rod 22a equipped on the main body 22 with the help of the elastic component 21. More specifically, it can be contracted from a stretched state, thereby buffering the load applied to the resistance measurement unit 10.

[0090] However, when the resistance measuring unit 10 is tilted toward one of the ends in the longitudinal direction of the load buffer unit 20 due to the influence of waves, etc., the movable part 23 combined with the resistance measuring unit 10 will tilt toward one of the front end and the end of the guide rod 22a, so the contraction of one of the elastic parts 21 in contact with it will be restricted, making it difficult to buffer the load in the load buffer unit 20.

[0091] However, the present invention includes a balance point correction force applying unit 30, which can be used to apply a load to induce the resistance measuring unit 10 to the middle part between one end and the other end of the load buffer unit 20 in the longitudinal direction, that is, the forward and backward rocking balance point under the waves, thereby ensuring that the elastic component 21 of the load buffer unit 20 can be smoothly stretched and contracted and thereby smoothly utilize the load buffer unit 20 to buffer the load.

[0092] At this time, a cable 31 is connected between the balance point correction force applying unit 30 and the resistance measuring unit 10 , so that a load can be applied to the resistance measuring unit 10 through the cable 31 .

[0093] Among them, the front end of the cable 31 extending from the balance point correction force application unit 30 is connected to the ring component 11b on one side of the force sensor 11 equipped with the resistance measurement unit 10, thereby realizing the connection of the cable 31 between the balance point correction force application unit 30 and the resistance measurement unit 10.

[0094] In addition, the balance point correction force applying unit 30 is as follows Figure 6 As shown, a scale portion 34 can be included, which is disposed on one side of the main body 32 and applies a preset load to the cable 31 by selectively coupling the weight 34a with different loads. Thus, by selectively coupling the weight 34a to the scale portion 34, a load corresponding to the scale of the waves can be applied to the cable 31. Therefore, not only can a still water resistance test be smoothly performed in a state without waves, but also an additional resistance test in waves, more specifically, in a short-wavelength region where heave and pitch motions are very small and the wavelength is shorter than the hull length, can be smoothly performed. This avoids the inconvenience of having to replace the measuring device even when performing both still water resistance tests and additional resistance tests in waves simultaneously.

[0095] The present invention described in the foregoing is not limited to the embodiments described, but may be modified without departing from the spirit of the invention as claimed in the claims, and the modifications are included in the scope of protection of the invention as defined by the appended claims.

Claims

1. A resistance measurement system for ship model testing applicable to various sea surface conditions, characterized in that: include: a resistance measurement unit, connected and installed in a towing rod extending from the model ship, and measuring the resistance acting on the model ship in still water and in waves through a force sensor; a load buffering unit, disposed in a fixing device extending from a measuring frame of a towing vehicle used to tow the model ship, elastically supporting the resistance measuring unit through an elastic component, thereby buffering the load applied to the resistance measuring unit; as well as, The balance point correction force applying unit is arranged in the measurement frame of the untowed vehicle used to tow the model ship, and applies a load to the resistance measuring unit via a cable connection, thereby inducing the resistance measuring unit coupled to the load buffer unit to the forward and backward rocking balance point under the waves. The resistance measurement unit includes: a main body, which supports the force sensor in a manner that allows it to move forward and backward; And, the combining component is threadedly engaged with the main body, and the forward and backward movement range of the force sensor on the main body is adjusted by rotating forward and backward.

2. The resistance measurement system for ship model testing applicable to various sea conditions according to claim 1, characterized in that: The resistance measuring unit includes a connecting component coupled to one end of the force sensor and coupled to a towing rod extending from the model ship.

3. The resistance measurement system for ship model testing applicable to various sea conditions according to claim 1, characterized in that: The force sensor includes, on one side thereof, a ring component to which the cable extending from the balance point correction force applying unit can be connected.

4. The resistance measurement system for ship model testing applicable to various sea conditions according to claim 1, characterized in that: The load buffer unit includes: a main body equipped with a plurality of guide rods for mounting the elastic component; and a movable component arranged on the guide rods in a manner that can slide back and forth, with one end and the other end in the length direction respectively contacting the elastic component.

5. The resistance measurement system for ship model testing applicable to various sea conditions according to claim 1, characterized in that: The load buffer unit includes a pulley configured to convert a traveling direction of the cable extending from the balance point correction force applying unit.

6. The resistance measurement system for ship model testing applicable to various sea conditions according to claim 1, characterized in that: The balance point correction force applying unit includes: a main body having a horizontal frame connected between two vertical frames; and pulleys configured at multiple positions on the main body to convert the travel direction of the cable.

7. The resistance measurement system for ship model testing applicable to various sea conditions according to claim 1, characterized in that: The balance point correction force applying unit includes a scale portion that applies a preset load to the cable by selectively combining with weights of different loads.

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