Measuring device for correcting self-propelled dynamometer under static condition

Abstract

The present invention relates to a measurement device for self-propelled dynamometer correction under static conditions, comprising: a main body separated from a bottom by being supported by a first leg and a second leg disposed opposite to each other with a gap therebetween; a support table disposed on an upper surface of one end portion of the main body and supporting the self-propelled dynamometer to be corrected; and a thrust corrector that rotatably supports one end of a connecting member extending from the self-propelled dynamometer by a pair of mounting racks extending upward from the upper surface of the main body, and that mounts a weight on one of first mounting members respectively disposed at the tip and tip of a first arm extending from the longitudinal direction of the main body, thereby correcting the thrust of the self-propelled dynamometer. Transmitting thrust to one end of the connecting part; and a torque corrector that is connected to a connection member extending from the self-propelled dynamometer, and transmits torque to the connection member by placing a weight on either of second placement members respectively disposed at the tip and tip of a second arm extending in the width direction of the main body.

Description

Technical Field

[0001] The present invention relates to a measuring device, and more particularly, to a measuring device for calibrating a self-propelled dynamometer under static conditions, which simultaneously measures thrust and torque and performs corrections through a self-propelled dynamometer suitable for model tests of ships, thereby being able to accurately understand the overall performance level and state of the interference amount between various data related to thrust and torque measurements. Background Art

[0002] Ships mainly operate on the sea, and the size, direction and shape of sea waves are also complex.

[0003] Moreover, when operating at sea, ships are affected not only by waves, but also by strong winds and tidal movements.

[0004] Therefore, preferably, when designing a ship, it is necessary to take into account the waves, strong winds, and tides that may occur during navigation.

[0005] However, when building a ship, it is impossible to test and design it in the sea, so it is necessary to manufacture a "model ship" after reducing it to the same ratio as the actual ship to be designed, and place it in a ship model test tank that provides an environment similar to the actual sea. Then, various model tests are carried out, such as resistance propulsion tests based on the shape of the model ship, and propulsion force tests based on the curved shape of the propeller.

[0006] At this time, when conducting model tests, if it is a surface ship, the Froude similarity law is applied, and if it is a submarine, the speed traction test is applied using the Reynolds similarity law. The various physical quantities measured at this time are interpreted as the test interpretation procedures of the International Watercraft Association, etc., and are used to evaluate the fluid performance of actual-sized ships.

[0007] At this time, the size of the physical quantity to be measured, the measurement environment, the frequency, etc. are different in each model test.

[0008] Therefore, a sensor suitable for the characteristics and measurement range of the measurement data is selected and tested.

[0009] During the above-mentioned model test process, the physical quantity can be measured by a load sensor.

[0010] At this time, the load sensor used for an impedance test in the model test, i.e., the impedance dynamometer, measures data only from the impedance (force) in one axis direction. Therefore, there is no need to consider the data measured simultaneously or the influence and interference of external disturbances. On the contrary, as disclosed in Korean Patent No. 10-1401498, the self-propelled dynamometer of the rotary load sensor type used for impedance test basically measures two types of data: thrust and torque. Therefore, there is mutual interference between the two types of data. Therefore, in order to understand the precise amount of interference, correction is required.

[0011] Here, calibration refers to a series of processes including using a plurality of precision-made weights of different weights to provide a predetermined thrust and torque to the dynamometer before using the self-propelled dynamometer, analyzing the relationship between the output power value measured by the dynamometer and the provided thrust and torque to calculate the calibration value for the set thrust and torque, and then applying the calibration value to the thrust and torque actually measured by the self-propelled dynamometer to obtain a more accurate measured value.

[0012] In addition, due to the recent improvement in ship design qualification standards for ship classes based on carbon emission regulations of the IMO (International Maritime Organization), there is a demand both at home and abroad to improve overall performance evaluation technology from model ship manufacturing to the derivation of model test results. Therefore, new inspection and calibration work is required to accurately evaluate the performance of all dynamometers that measure the force applied to the rotating shaft, such as self-propelled dynamometers that measure the thrust and torque used in ship model tests, and verify the measured values.

[0013] However, in the past, the calibration of the rotary load sensor, that is, the calibration of the self-propelled dynamometer, was carried out by directly hanging a weight on the rotating shaft connected to the self-propelled dynamometer while the self-propelled dynamometer was applied to an actual model ship. Therefore, there was inevitably interference from various structures forming the model ship, which made the calibration work itself very cumbersome and reduced the accuracy of the calibration.

[0014] For the above reasons, the relevant field is developing a measuring device that can accurately grasp and understand the overall performance level and status of a self-propelled dynamometer suitable for ship model testing, but a satisfactory structure has not yet been obtained.

[0015]

Prior technical literature

[0016] [Patent Literature]

[0017] (Patent Document 1) Korean Patent No. 10-1401498 Summary of the invention

[0018] 1. Technical issues to be resolved

[0019] The present invention is provided to solve the above-mentioned problems of the prior art, and its purpose is to provide a measuring device for calibrating the self-propelled dynamometer under static conditions, which can simultaneously measure thrust and torque and perform corrections through a self-propelled dynamometer used for ship model tests, thereby accurately understanding the overall performance and state of the interference amount between various data related to the thrust and torque measurements.

[0020] (II) Technical solution

[0021] In order to achieve the above-mentioned purpose, the present invention provides a measuring device for calibrating a self-propelled dynamometer under static conditions, comprising: a main body, which is supported and separated from the bottom by a first leg and a second leg arranged opposite to each other at a distance; a support table, which is arranged on the upper side of one end of the main body to support the self-propelled dynamometer to be calibrated; a thrust corrector, which rotatably supports one end of a connecting component extending from the self-propelled dynamometer by a pair of mounting frames extending upward from the upper side of the main body, and places a weight on one of the first mounting components respectively arranged at the front end and the end of a first arm extending from the length direction of the main body, thereby transmitting thrust to one end of the connecting component; and a torque corrector, which is connected to the connecting component extending from the self-propelled dynamometer, and places a weight on one of the second mounting components respectively arranged at the front end and the end of a second arm extending from the width direction of the main body, thereby transmitting torque to the connecting component.

[0022] The support platform is arranged on a linear motion module, and the support platform is moved in the length direction of the main body through the linear motion module, so as to adjust the distance between the self-propelled dynamometer and the thrust corrector and the torque corrector.

[0023] The first leg and the second leg of the main body each include wheels arranged at a plurality of locations on a bottom surface.

[0024] The linear motion module of the support platform includes a screw rod that rotates forward and reversely and a moving module that is threadedly engaged with the screw rod.

[0025] The screw of the linear motion module rotates forward and reversely by rotating a handle or being driven by a motor.

[0026] The mounting frames of the thrust corrector respectively include air bearings arranged at the same height.

[0027] The second arm of the torque corrector is connected to a connection member extending from the self-propelled dynamometer, and is connected to a section of the connection member exposed between one and another of the mounting frames of the thrust corrector.

[0028] (III) Beneficial effects

[0029] The measuring device for calibrating a self-propelled dynamometer under static conditions of the present invention has a connecting component extending from the self-propelled dynamometer connected to a thrust corrector and a torque corrector arranged on a main body, and weights are placed on a first placement component arranged on a first arm of the thrust corrector and a second placement component arranged on a second arm of the torque corrector, so that thrust and torque can be transmitted to the connecting component. Thus, the thrust and torque are measured and corrected by the self-propelled dynamometer, so that the overall performance level and status of the self-propelled dynamometer including the interference amount of thrust and torque can be accurately understood, thereby improving the reliability of the test results in the process of using the self-propelled dynamometer to perform model tests in the future.

[0030] The measuring device for calibrating a self-propelled dynamometer under static conditions of the present invention has a support platform that is placed on a linear motion module, and the support platform is moved in the length direction of the main body through the linear motion module, thereby being able to adjust the distance between the self-propelled dynamometer and the thrust corrector and the torque corrector, and adjusting the distance between the self-propelled dynamometer and the thrust corrector and the torque corrector according to the conditions when the self-propelled dynamometer is applied to an actual model ship, thereby being able to calibrate the self-propelled dynamometer under conditions that are more similar to the actual conditions, thereby further improving the reliability of the calibration.

[0031] The measuring device for calibrating a self-propelled dynamometer under static conditions of the present invention comprises mounting frames of thrust correctors respectively including air bearings arranged at the same height, and connecting components extending from the self-propelled dynamometer are rotatably supported by the air bearings, thereby preventing the connecting components from being contacted by structures and causing interference during rotation, thereby more accurately transmitting thrust and torque to the connecting components through the thrust corrector and the torque corrector, and more accurately performing thrust and torque measurement and correction through the self-propelled dynamometer. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 A perspective view showing the appearance of a measuring device for calibrating a self-propelled dynamometer under static conditions according to the present invention;

[0033] Figure 2 An exemplary diagram showing the thrust transmission through the thrust corrector in the measuring device for self-propelled dynamometer calibration under static conditions of the present invention;

[0034] Figure 3 An exemplary diagram showing the transmission of torque through a torque corrector in a measuring device for calibration of a self-propelled dynamometer under static conditions according to the present invention;

[0035] Figure 4 An exemplary diagram showing the self-propelled dynamometer before and after the movement in the measuring device for calibrating the self-propelled dynamometer under static conditions of the present invention;

[0036] Figure 5 The present invention is a diagram showing an example of a connection component supported by an air bearing provided on a support platform of a thrust corrector in a measuring device for calibrating a self-propelled dynamometer under static conditions according to the present invention.

[0037] Description of reference numerals:

[0038] 10: Main body 11: First leg

[0039] 12: Second leg 20: Support platform

[0040] 21: Linear motion module 21a: Screw

[0041] 21b: Mobile module 21c: Handle

[0042] 30: thrust corrector 31: mounting bracket

[0043] 31a: Air bearing 32: First arm

[0044] 33: First mounting component 40: Torque corrector

[0045] 41: Second arm 42: Second mounting member

[0046] 100: Self-propelled dynamometer 110: Connecting parts

[0047] A: Measuring device for calibration of self-propelled dynamometers DETAILED DESCRIPTION

[0048] Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

[0049] like Figure 1 As shown, the measuring device A for calibrating a self-propelled dynamometer under static conditions of the present invention comprises: a main body 10 , a support platform 20 , a thrust corrector 30 and a torque corrector 40 .

[0050] The main body 10 of the present invention is supported by a first leg 11 and a second leg 12 that are disposed opposite to each other with a gap therebetween and is partitioned from the bottom.

[0051] Thus, the support table 20, the thrust corrector 30, and the torque corrector 40 provided in the main body 10 are separated from the bottom.

[0052] In the above-mentioned main body 10, wheels 13 are formed at a plurality of locations on the bottom surfaces of the first leg 11 and the second leg 12, respectively. Thus, the wheels 13 rotate in a state of contact with the ground, and the main body 10 can be moved.

[0053] Furthermore, the wheel 13 includes a locking member 13a, so that arbitrary rotation can be prevented by locking the locking member 13a.

[0054] At this time, the locking member 13a may be applied with any common structure and method that can prevent the wheel 13 from rotating, and a detailed description of the locking member 13a is omitted here.

[0055] The support platform 20 of the present invention is disposed on one end of the main body 10 to support the self-propelled dynamometer 100 to be calibrated.

[0056] The self-propelled dynamometer 100 to be calibrated is supported by the support table 20 , whereby the connection member 110 connected from the self-propelled dynamometer 100 can be connected to the thrust corrector 30 and the torque corrector 40 .

[0057] The supporting platform 20 is placed on the linear motion module 21 .

[0058] Therefore, when the linear motion module 21 is in operation, the support platform 20 and the self-propelled dynamometer 100 supported thereby can be moved, and the distance from the self-propelled dynamometer 100 to the thrust corrector 30 and the torque corrector 40 can be adjusted.

[0059] At this time, the linear motion module 21 includes a screw rod 21a that rotates forward and reversely and a moving module 21b that is threadedly engaged with the screw rod 21a, so that the moving module 21b on which the support table 20 is placed can move by means of the rotation of the screw rod 21a, thereby enabling the support table 20 to move.

[0060] Here, the forward and reverse rotation of the screw rod 21a can be performed by rotating the handle 21c, but it is not limited to this.

[0061] That is, one end of the screw 21 a is connected to a motor (not shown in the drawings), and is driven by the motor to perform forward and reverse rotations.

[0062] Furthermore, the self-propelled dynamometer 100 supported by the support platform 20 is fixed to the support platform 20 by bolts or the like, thereby preventing the self-propelled dynamometer 100 from being arbitrarily separated from the support platform 20 .

[0063] The thrust corrector 30 of the present invention rotatably supports one end of a connecting component 110 extending from the self-propelled dynamometer 100 by means of a pair of mounting frames 31 extending upward from the top of the main body 10, and a weight is mounted on one of the first mounting components 33 respectively arranged at the front end and the end of a first arm 32 extending along the length direction of the main body 10, thereby being able to transmit thrust to one end of the connecting component 110.

[0064] The thrust is transmitted to the connection member 110 through the thrust corrector 30 , so that the thrust can be measured by the self-propelled dynamometer 100 connected to the connection member 110 .

[0065] The mounting frame 31 of the thrust corrector 30 includes air bearings 31 a disposed at the same height, respectively, so that the connecting member 110 extending from the self-propelled dynamometer 100 is supported by each air bearing 31 a, thereby preventing structural contact and allowing the connecting member 110 to rotate more stably.

[0066] At this time, the air bearing 31 a may be of any common structure and method as long as it can rotatably support the connecting member 110 without structural contact, and therefore, a detailed description of the air bearing 31 a is omitted.

[0067] Furthermore, the first arm 32 of the thrust corrector 30 is connected to the connecting member 110 by a rod, so when a weight (not shown) is placed on the first placement member 33 at one end, it tilts in one direction and pulls or pushes the connecting member 110, thereby transmitting thrust.

[0068] Also, the first seating member 33 of the thrust corrector 30 is formed in a disc shape, which is only used to support the weight and has no other functions, and therefore, a detailed description of the first seating member 33 is omitted.

[0069] The torque corrector 40 of the present invention is connected to a connecting component 110 extending from the self-propelled dynamometer 100, and a weight is placed on one of the second placement components 42 respectively arranged at the front end and the end of the second arm 41 extending in the width direction of the main body 10, so that torque can be transmitted to the connecting component 110.

[0070] The torque is transmitted to the connection member 110 by the torque corrector 40 , and thus the torque can be measured by the self-propelled dynamometer 100 connected to the connection member 110 .

[0071] The second arm 41 of the torque corrector 40 is connected to a connecting component 110 extending from the self-propelled dynamometer 100, and is connected to a section of the connecting component 110 exposed between one and another of the mounting frames 31 of the thrust corrector 30, so that when the second arm 41 is connected to the connecting component 110, interference with the mounting frame 31 can be prevented.

[0072] Furthermore, when a weight is placed on the second placement member 42 at one end, the second arm 41 of the torque corrector 40 is tilted in one direction, thereby being able to transmit torque to the connection member 110 .

[0073] Furthermore, the second placement component 42 of the torque corrector 40 is formed in a disc shape, which only supports the weight and has no other functions, so the detailed description of the second placement component 42 is omitted.

[0074] The calibration of the self-propelled dynamometer 100 using the measuring device A for calibrating the self-propelled dynamometer under static conditions according to the present invention will be described in detail below.

[0075] The self-propelled dynamometer 100 to be calibrated according to the present invention is fixed to a support table 20 disposed on the main body 10 .

[0076] Thus, the self-propelled dynamometer 100 is supported by means of the support table 20 .

[0077] Furthermore, the connection member 110 extending from the self-propelled dynamometer 100 is connected to the thrust corrector 30 and the torque corrector 40 disposed on the main body 10 .

[0078] Here, the thrust corrector 30 of the present invention includes a first arm 32 extending in the length direction of the main body 10, and a first placement member 33 is respectively disposed at the front end and the end of the first arm 32. Figure 2 As shown, when a weight is placed on one of the first placement components 33, the first arm 32 tilts in one direction and applies a predetermined thrust (the weight of the weight) to the connecting component 110, so that the thrust can be measured by the self-propelled dynamometer 100 connected to the connecting component 110, and during the thrust measurement process of the self-propelled dynamometer 100, the self-propelled dynamometer 100 can be corrected by calculating the physical quantity of the power signal of the self-propelled dynamometer 100.

[0079] Furthermore, the torque corrector 40 of the present invention includes a second arm 41 extending in the width direction of the main body 10, and a second placement member 42 is disposed at the front end and the end of the second arm 41, respectively. Figure 3 As shown, when a weight is placed on one of the second placement components 42, the second arm 41 tilts in one direction and applies a predetermined torque (the weight of the weight) to the connecting component 110, so that the torque can be measured by the self-propelled dynamometer 100 connected to the connecting component 110, and during the torque measurement process of the self-propelled dynamometer 100, the self-propelled dynamometer 100 is corrected by calculating the physical quantity of the power signal of the self-propelled dynamometer 100.

[0080] As described above, the thrust and torque are measured by the self-propelled dynamometer 100 through the thrust corrector 30 and the torque corrector 40, and the self-propelled dynamometer 100 is calibrated, so that the overall performance level and status of the self-propelled dynamometer 100 can be accurately understood. In the subsequent model test process using the self-propelled dynamometer 100, the correction values ​​are applied to the thrust and torque actually measured by the self-propelled dynamometer 100, thereby improving the reliability of the model test results.

[0081] Here, the thrust and torque measurements of the self-propelled dynamometer 100 can be performed simultaneously through the thrust corrector 30 and the torque corrector 40, so the interference amount between the thrust and the torque can be calculated. Therefore, in the process of model testing using the self-propelled dynamometer 100, a correction value taking into account the interference amount between the thrust and the torque is applied to the actual output power value of the self-propelled dynamometer 100, thereby improving the reliability of the model test results.

[0082] Furthermore, the measuring device A for calibrating a self-propelled dynamometer under static conditions of the present invention can improve the calibration reliability of the self-propelled dynamometer 100 .

[0083] That is, the support platform 20 supporting the self-propelled dynamometer 100 in the present invention is placed on the linear motion module 21, such as Figure 4 As shown, the support platform 20 is moved in the length direction of the main body 10 by means of the linear motion module 21, so that the distance between the self-propelled dynamometer 100 and the thrust corrector 30 and the torque corrector 40 can be adjusted. Therefore, the distance between the self-propelled dynamometer 100 and the thrust corrector 30 and the torque corrector 40 is adjusted similarly to the conditions when the self-propelled dynamometer 100 is applied to a model ship (not shown in the accompanying drawings). Therefore, not only the thrust and torque can be measured by the self-propelled dynamometer 100, but also the self-propelled dynamometer 100 can be calibrated under conditions substantially the same as the actual conditions, thereby further improving the reliability of the calibration of the self-propelled dynamometer 100.

[0084] Furthermore, the mounting frame 31 provided in the thrust corrector 30 of the present invention includes air bearings 31a arranged at the same height, such as Figure 5 As shown, the connecting component 110 extending from the self-propelled dynamometer 100 is rotatably supported by the air bearing 31a, thereby preventing interference caused by contact with the structure when the connecting component 110 rotates, and can more accurately transmit thrust and torque to the connecting component 110 through the thrust corrector 30 and the torque corrector 40. Therefore, not only can the thrust and torque be measured by the self-propelled dynamometer 100, but the self-propelled dynamometer 100 can also be calibrated more accurately, thereby further improving the reliability of the calibration of the self-propelled dynamometer 100.

[0085] The present invention described above is not limited to the above-mentioned embodiments. Therefore, the present invention can be modified without departing from the gist of the present invention claimed in the claims, and the above-mentioned modifications belong to the protection scope of the present invention defined in the claims.

Claims

1. A measuring device for calibration of a self-propelled dynamometer under static conditions, characterized in that: include: A main body which is supported by a first leg and a second leg which are arranged opposite to each other with a gap therebetween and is separated from the bottom; a support platform, which is arranged on an end portion of the main body and supports the self-propelled dynamometer to be calibrated; A thrust corrector, which rotatably supports one end of a connecting member extending from the self-propelled dynamometer by a pair of mounting brackets extending upward from the upper surface of the main body, and places a weight on one of the first mounting members respectively arranged at the front end and the end of the first arm extending from the length direction of the main body, thereby transmitting thrust to one end of the connecting member; and a torque corrector connected to a connecting member extending from the self-propelled dynamometer, and placing a weight on one of the second placing members respectively arranged at the front end and the end of the second arm extending in the width direction of the body, thereby transmitting torque to the connecting member, The support platform is arranged on a linear motion module, and the support platform is moved in the length direction of the main body through the linear motion module, so as to adjust the distance between the self-propelled dynamometer and the thrust corrector and the torque corrector.

2. The measuring device for calibrating a self-propelled dynamometer under static conditions according to claim 1, characterized in that: The first leg and the second leg of the main body each include wheels arranged at a plurality of locations on a bottom surface.

3. The measuring device for calibrating a self-propelled dynamometer under static conditions according to claim 1, characterized in that: The linear motion module of the support platform includes a screw rod that rotates forward and reversely and a moving module that is threadedly engaged with the screw rod.

4. The measuring device for calibrating a self-propelled dynamometer under static conditions according to claim 3, characterized in that: The screw of the linear motion module rotates forward and reversely by rotating a handle or being driven by a motor.

5. The measuring device for calibrating a self-propelled dynamometer under static conditions according to claim 1, characterized in that: The mounting frames of the thrust corrector respectively include air bearings arranged at the same height.

6. The measuring device for calibrating a self-propelled dynamometer under static conditions according to claim 1, characterized in that: The second arm of the torque corrector is connected to a connection member extending from the self-propelled dynamometer, and is connected to a section of the connection member exposed between one and another of the mounting frames of the thrust corrector.

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