KR101408352B1 - Apparatus and method for measuring circularity of submarine - Google Patents

Abstract

The present invention relates to an apparatus and a method for measuring a roundness of a submarine, which can determine the degree of an endurance of a submarine by measuring a plurality of measurement points with respect to the inner and outer circumferential directions of the submarine using a three-dimensional measuring equipment.
According to an embodiment of the present invention, there is provided a method of measuring the roundness of a submarine using a three-dimensional measuring instrument, comprising: installing two or more targets for setting reference coordinates at a predetermined position in a measurement space; Measuring coordinates of the installed target by the 3D measurement equipment and measuring coordinates of a plurality of measurement points attached in the circumferential direction of the submarine; And analyzing the degree of acute of the submarine based on the coordinates of the measured target and the coordinates of the measurement point.

Description

[0001] APPARATUS AND METHOD FOR MEASURING CIRCULARITY OF SUBMARINE [0002]

The present invention relates to an apparatus and a method for measuring the roundness of a submarine, and more particularly, to a submarine which measures a plurality of measurement points in a circumferential direction of a submarine using a three- And a method for measuring the roundness of a circle.

In heavy industry manufacturing shipbuilding and plant structures, it is necessary to measure whether roundness is guaranteed within manufacturing tolerance limit in order to ensure structural rigidity by internal and external pressure when manufacturing large cylindrical structures such as submarine and pressure tank.

Conventionally, there are three methods of roundness measurement. Among them, the first roundness measuring method is to install a moving compass structure measuring instrument at the center position of a cylindrical structure of the pressure hull, draw a locus in the circumferential direction As a result of the measurement, the roundness was measured by a marking device provided at the center of the structure to illustrate the state of origin of the structure. Such a compass-shaped roundness measuring apparatus is described in, for example, U.S. Patent Application No. 10-1996-66332.

The second roundness measurement method was to mark the measurement point by dividing the structure at regular intervals, and measure the diameter by measuring the diameter using a tape measure.

The third roundness measurement method is to install a jig on both sides of the structure that can cover the outer surface of the cylindrical structure pressure hull, install a wire to the jig at both ends of the measurement position divided at regular intervals, And roundness was measured.

However, such a roundness measuring method requires a manual measurement of the measuring instrument installed at the center of the hull, a measurement using a tape measure or a wire installed on the jig, There is also a high possibility of error in measurement.

Also, the conventional roundness measurement method is not able to measure the roundness of the structure in situations where direct measurement can not be performed due to the interference of the outside of the structure.

An object of the present invention is to provide a method and apparatus for measuring the coordinates of a target point and a measurement point attached along a circumferential direction of a submarine by using a three-dimensional measuring equipment, and determining the roundness of the submarine using measured coordinates, And it is an object of the present invention to provide an apparatus and method for measuring the roundness of a submarine which can minimize error that may occur due to manual operation and can expect accuracy of measurement results.

According to an aspect of the present invention, there is provided a method of measuring a roundness of a submarine using a three-dimensional measuring equipment, the method comprising: setting two or more targets for setting reference coordinates at a predetermined position in a measurement space; ; Measuring coordinates of the installed target by the 3D measurement equipment and measuring coordinates of a plurality of measurement points attached in the circumferential direction of the submarine; And analyzing the degree of acute of the submarine based on the coordinates of the measured target and the coordinates of the measurement point.

The installing step may include setting a reference coordinate system for the target so that measurement results expressed by one and the same coordinate system can be obtained at any point where the target is installed.

The installing step may include installing three or more targets when the measurement space is a floating structure or an upper part of a structure where the measurement equipment is installed, and when two or more targets It is desirable to install it.

Preferably, the measuring step measures the degree of endurance of the plurality of circumferential positions at arbitrary intervals in the longitudinal direction by providing measurement points along the circumferential direction of the submarine.

The step of installing comprises the steps of installing a bar jig at a position where target and collimation are impossible by other interference; And installing a first target at an end of the bar jig and installing a second target at a designated position on the bar jig.

Wherein the analyzing step calculates the center coordinates and the radius value of the reference circle using the measured coordinates and calculates an error with respect to the radius values from the center coordinate to the measurement point measured based on the average radius value of the calculated radius value And determine the extent of the submarine based on the calculated error.

In addition to this, a computer-readable recording medium recording a computer program for executing the above methods is further provided.

According to another embodiment of the present invention, there is provided an apparatus for measuring the roundness of a submarine using a three-dimensional measuring device, comprising: at least two targets installed for setting reference coordinates at a predetermined position within a measurement space by the three- A measurement unit for measuring a plurality of measurement points attached in the circumferential direction of the submarine; A calculating unit calculating a center value and a radius value of the reference circle by using the coordinates of the target measured by the measuring unit and the respective coordinates of the plurality of measurement points and calculating an average radius value of the calculated radius value; And an analyzer for calculating an error with respect to radius values from the center coordinate to a measurement point measured based on the calculated average radius value and determining an accuracy of the submarine based on the calculated error, Device is provided.

And a setting unit configured to set a reference coordinate system for the target so that a measurement result expressed by one identical coordinate system can be obtained at any point where the target is installed.

It is preferable that three or more targets are provided when the measurement space is a floating structure or an upper portion of a structure where the installation place of the measurement equipment flows and two targets are provided when the measurement space is a fixed ground surface .

Preferably, the measuring unit measures the degree of endurance with respect to a plurality of circumferential positions at arbitrary intervals in the longitudinal direction by providing measurement points along the circumferential direction of the submarine.

Preferably, the target includes a first target provided at an end of a bar-shaped jig provided at a position where it is impossible to target and collimate by other interference, and a second target provided at a designated position on the bar-shaped jig.

According to the embodiment of the present invention, the coordinate of the target is measured by the 3D measurement equipment and the coordinates of the measurement point attached along the circumferential direction of the submarine are measured, and the roundness of the submarine is determined using the measured coordinates, It is possible to shorten the measurement time while minimizing the error, and it is possible to derive accurate and reliable measurement results than the manual measurement method.

Also, according to the embodiment of the present invention, when three or more targets are installed in the measurement of a submarine which is in a moving or unstable condition of a measurement space, it is possible to stably measure the measurement points attached to the submarine.

Also, according to the embodiment of the present invention, the coordinates of the target can be measured through two targets installed on the bar jig in a situation where collimation by other interference is impossible.

In addition, according to the embodiment of the present invention, the measuring points simultaneously measured on the column units attached in the circumferential direction of the submarine can be measured simultaneously, thereby reducing the measurement time with ease and contributing to the improvement of productivity and quality. In addition, it can be extended to the measurement of the origin of pressure vessels and prototype structures produced in the shipbuilding and plant industries.

1 is a block diagram illustrating an apparatus for measuring roundness of a submarine according to an embodiment of the present invention.
FIG. 2 is a flow chart for explaining a roundness measuring method using the staff measurement device of the submarine shown in FIG. 1. FIG.
3 is a view showing an environment for measuring a measurement point attached along the circumferential direction of the submarine,
4 is a view showing a state where a plurality of measurement points attached along the circumferential direction of the submarine are attached at regular intervals in the longitudinal direction, and
5 is a diagram showing an environment for measuring the roundness of a submarine using a bar jig in an environment where collimation by other interferences is impossible.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram illustrating an apparatus for measuring a roundness of a submarine according to an embodiment of the present invention.

Referring to FIG. 1, the apparatus for measuring the roundness of a submarine 15 according to the embodiment of the present invention may be mounted in the 3D measurement equipment (corresponding to 10 'in FIG. 3) or mounted on the digital device 20. The digital device 20 is capable of communicating with the three-dimensional measurement device through a wired / wireless communication method and receives measurement data from the three-dimensional measurement device.

The submarine circularity measuring apparatus 15 measures arbitrary points on the circumference of a cylindrical structure without design coordinate values in a three-dimensional space, calculates the center coordinates of the circle, the average radius, and the radius and error of each measurement point, The reference coordinate system of the cylindrical structure can be measured based on the design coordinate value, and the error can be analyzed based on the design standard.

The submarine circularity measuring apparatus 15 described above includes a setting unit 151, a measuring unit 152, a calculating unit 153, an analyzing unit 154, a memory 155, and the like.

The setting unit 151 sets a reference coordinate system for the corresponding target so that a measurement result expressed by one identical coordinate system may appear at any point where the target is installed.

The target requires three or more targets if the measurement space is a floating structure or the top of the structure where the measurement equipment installation site is not fixed and flows, and two targets are required if the measurement space is fixed. do.

Since the Z axis, which is a vertical axis in the case of two targets, is the same as the gravity direction, the setting unit 151 sets the X axis or the origin and the Y axis as a horizontal axis, and sets three points for forming an orthogonal coordinate system , That is, the origin, X axis, Y axis or origin, X axis, Z axis, origin Y axis, and Z axis.

More specifically, the setting unit 151 sets the X-axis and the Z-axis to the X-axis because the three-dimensional measuring equipment is horizontally aligned with the ground through the auto-leveling function when measuring on land (PE, Set the two-point reference for the XZ plane or YZ plane with the axis as the reference axis. The first measurement point is the origin and the second measurement point is the X-axis direction to define the reference axis.

In the case of three targets, the setting unit 151 can measure three points because the fixed reference axis can not be set when a place where the three-dimensional measuring equipment is installed is not stable (floating dock, on-deck, etc.) Can be set. The first measurement point becomes the origin, the second measurement point forms the X axis, and the third measurement point forms the Y axis.

In the case of three targets, the setting unit 151 can measure three points because the fixed reference axis can not be set when a place where the three-dimensional measuring equipment is installed is not stable (floating dock, on-deck, etc.) Can be set. The first measurement point becomes the origin, the second measurement point forms the X axis, and the third measurement point forms the Y axis.

Total station, laser trekker, etc., are equipped with software to measure, display and store the position coordinates of measurement point by measuring angle and distance. The three-dimensional measuring device is also connected to a digital device, for example, a working computer and its distance wireless communication such as wired or Bluetooth, to transmit and receive data.

The measurement unit 152 measures the coordinates of a target point for setting the reference coordinates at a certain position in the measurement space and a measurement point attached as many as the desired number in the circumferential direction of the submarine.

3, the measuring unit 152 is connected to the first and second targets T1 and T2 at a first position through the three-dimensional measuring equipment 10 and a plurality Measuring a plurality of measurement points P attached along the circumferential direction of the first and second targets T1 and T2 and the submarine 1 after moving to the second position, 3, the plurality of measurement points P attached along the circumferential direction of the first and second targets T1 and T2 and the submarine 1 are measured. 3, it is assumed that the position adjacent to the first target T1 is the first position, and the second position and the third position in the clockwise direction. The third position may be a position adjacent to the second target T2. The positions of the first and second targets T1 and T2 shown in FIG. 3 and the position of the three-dimensional measuring equipment 10 are not necessarily limited to the positions of the target and the three-dimensional measuring equipment . And forms a circle with a plurality of measurement points (P) attached along the circumferential direction of the submarine.

In the present embodiment, the coordinate of the target and the coordinates of the measurement point are measured by the apparatus for measuring the roundness of the submarine mounted on the three-dimensional measuring equipment. However, when the digital apparatus is equipped with the apparatus for measuring the roundness of the submarine, And a receiver for receiving the coordinates measured by the receiver.

The calculation unit 153 calculates the center coordinates and radius values of the reference circle by the optimization technique using the coordinates of the target measured at the first to third positions and the coordinates of the measurement point, that is, the circular discontinuous coordinate information, 1 < / RTI >

)가 최소가 되는 a, b,c 를 구하여 중심좌표와 반경값을 산출할 수 있다. 이는 중심에서부터 임의 측정점까지의 거리를

라고 할때 다음의 수학식 2에 의해 최소가 되는 원을 찾게 된다.Here, x and y are x and y coordinate values of a circle center expressed in a two-dimensional plane, and errors (

) Can be obtained by calculating a, b, and c, and the center coordinates and the radius value can be calculated. This means that the distance from the center to an arbitrary measuring point

, A circle is found to be minimum by the following equation (2).

는 중심에서부터 임의 측정점까지의 거리를 의미한다.Here, R is an average radius which is a reference value,

Means the distance from the center to an arbitrary measurement point.

The Minimum Zone Circle, which is often used in conjunction with the method of calculating by the above-described Equation 1 (Least Square Cicle), can be expressed by the following equation (3) The average center coordinates and the radius value are calculated through the iterative calculation process until the deviation of Rmax and Rmin among the calculated radius values using the arbitrary three points among the measurement points is minimized.

Here, x and y mean x and y coordinate values of a circle center expressed in a two-dimensional plane.

The calculating unit 153 may calculate the center coordinates of the submarine measured using Equation (1) or Equation (3).

The analyzing unit 154 calculates the error of the radius values from the center coordinate to the measurement point measured based on the average radius value obtained by averaging the radius values calculated by the calculating unit 153, .

The memory 155 may temporarily store the coordinates measured by the measuring unit 152. [ The memory 155 can also store the center coordinates, the radius value, and the average radius value calculated by the calculating unit 153, and can store the degree of acute of the submarine judged by the analyzing unit 154.

The environment shown in FIG. 3 shows a state in which a plurality of measurement points attached along the circumferential direction of the submarine are attached at regular intervals in the longitudinal direction.

3, the three-dimensional measuring equipment 10 measures the coordinates of the first and second targets T1 and T2 at the first position and measures a plurality of measurement points P attached along the circumferential direction of the submarine 1, That is, one measurement point in the line unit is measured simultaneously among the measurement points spaced apart in the longitudinal direction at a predetermined interval. The plurality of measurement points P are attached at regular intervals in the longitudinal direction of the submarine 1 and are circular in a line unit.

Measuring the coordinates of the first and second targets T1 and T2 at the first position and simultaneously measuring a plurality of measurement points P spaced apart in the longitudinal direction along the circumferential direction of the submarine 1, And the coordinates of the first and second targets T1 and T2 are measured in the second position as in the first position and the coordinates of the first and second targets T1 and T2 are measured in the second position and are measured in the longitudinal direction along the circumferential direction of the submarine 1, And simultaneously measures a plurality of spaced measurement points (P). In addition, measurement points may be provided along the circumferential direction to the submarine 1 to measure the degree of endurance with respect to a plurality of circumferential positions at arbitrary intervals in the longitudinal direction.

The measurement data measured in this manner can be calculated by the calculation unit 153 described above and can determine the degree of acute of the submarine 1 through the analysis unit 154 described above.

FIG. 4 is a diagram showing an environment for measuring the roundness of a submarine in a position where target and collimation are impossible by other interferences. FIG.

Referring to FIG. 4, the rod jig G is installed at a position where target and collimation are impossible by other interference, and the first and second targets T1 and T2 are installed in the bar jig G provided. The first target T1 may be installed at the end of the bar jig G and the second target T2 may be installed at a designated position on the bar jig G,

It is possible to measure the roundness of the submarine through the bar jig even in environments where it is impossible to measure the roundness of the submarine by other interferences.

A method of measuring the roundness using the apparatus for measuring the roundness of a submarine having such a configuration will now be described with reference to FIG.

FIG. 2 is a flowchart illustrating a method of measuring a roundness using the apparatus for measuring a roundness of a submarine according to an embodiment of the present invention.

First, a target for setting reference coordinates is installed at a predetermined position in the measurement space where the submarine 1 is placed (S11). The target has at least two targets when the measurement space is onshore and at least three targets when the measurement space is offshore. In addition, if it is impossible to measure by other interferences, a rod jig is installed on a submarine where the target and collimation can not be performed by other interference, and the target is installed on the bar jig installed.

Also, a plurality of measurement points may be attached to the submarine 1 at regular intervals along the circumferential direction, or a plurality of measurement points may be attached at arbitrary intervals in the longitudinal direction along the circumferential direction. The plurality of measurement points provided in the submarine 1 may be a single circle or a plurality of circles.

Then, the measuring unit 152 measures the coordinates of the two targets or the three targets and the coordinates of the plurality of measurement points attached along the circumferential direction of the submarine (S13). In this case, two targets can be used on land, but three targets can be used, and three targets can be used on the sea, but four or more targets can be used.

The calculation unit 153 calculates the center coordinates and the radius value of the reference circle using the coordinates of the target and the coordinates of the measurement point measured at the predetermined position in the measurement space (S15).

The analyzing unit 154 calculates the error of the radius values from the center coordinate to the measurement point measured based on the average radius value obtained by averaging the radius values calculated by the calculating unit 153, (S17).

The analysis unit 154 displays the degree of the thus-analyzed roundness on the screen. As a result, the user can easily confirm the degree of roundness. The screen may be a screen of a digital device or a screen of a three-dimensional measuring device.

In this way, accurate and reliable roundness can be derived through the coordinates measured using the three-dimensional measuring equipment, compared with the manual roundness measuring method using the measuring jig and tape measure.

Embodiments of the present invention include computer readable media including program instructions for performing various computer implemented operations. The computer-readable medium may include program instructions, local data files, local data structures, etc., alone or in combination. The media may be those specially designed and constructed for the present invention or may be those known to those skilled in the computer software. Examples of computer-readable media include magnetic media such as hard disks, floppy disks and magnetic tape, optical recording media such as CD-ROMs and DVDs, magneto-optical media such as floppy disks, and ROMs, And hardware devices specifically configured to store and execute the same program instructions. The medium may be a transmission medium such as optical or metal lines, waveguides, etc., including a carrier wave for transmitting a signal specifying a program command, a local data structure, and the like.

Examples of program instructions include machine language code such as those produced by a compiler, as well as high-level language code that can be executed by a computer using an interpreter or the like.

The invention being thus described, it will be obvious that the same way may be varied in many ways. Such modifications are intended to be within the spirit and scope of the invention as defined by the appended claims.

10: 3D measurement equipment 15: Submarine circularity measuring device
151: Setting unit 152:
153: calculating section 154: analyzing section
155: Memory

Claims (12)

A method for measuring the roundness of a submarine using a three-dimensional measuring device,
Installing two or more targets for setting reference coordinates at a predetermined position in the measurement space;
Measuring coordinates of the installed target by the 3D measurement equipment and measuring coordinates of a plurality of measurement points attached in the circumferential direction of the submarine; And
And analyzing the degree of acute of the submarine based on the coordinates of the measured target and the coordinates of the measured point. The method according to claim 1,
The step of installing
And setting a reference coordinate system for the target so that a measurement result expressed by one and the same coordinate system can be obtained at any point where the target is installed. The method according to claim 1,
The step of installing
Wherein three or more targets are provided when the measurement space is a floating structure or an upper portion of a structure where a measurement site is installed and two targets are installed when the measurement space is fixed. How to measure the roundness of a submarine. The method according to claim 1,
The measuring step
Wherein the measurement points are provided along the circumferential direction of the submarine to measure the degree of roundness of the plurality of circumferential positions at arbitrary intervals in the longitudinal direction. The method according to claim 1,
The step of installing
Installing a rod jig in a position where target and collimation are impossible by other interference; And
Installing a first target at an end of the bar jig and installing a second target at a designated position on the bar jig.
The method according to claim 1,
The analyzing step
Calculating center coordinates and radius values of the reference circle using the measured coordinates and calculating an error with respect to the radius values from the center coordinate to the measurement point measured based on the calculated average radius value of the radius value, And determining an extent of the submarine based on the error. A computer-readable recording medium recording a computer program for performing the method of measuring the roundness of a submarine according to any one of claims 1 to 6. An apparatus for measuring the roundness of a submarine using a three-dimensional measuring device,
A measurement unit for measuring two or more targets installed for setting reference coordinates at predetermined positions in the measurement space by the three-dimensional measurement equipment and a plurality of measurement points attached in the circumferential direction of the submarine;
A calculating unit calculating a center coordinate and a radius value of the reference circle by using the coordinates of the target measured by the measuring unit and the respective coordinates of the plurality of measurement points and calculating an average radius value of the calculated radius value; And
And an analyzer for calculating an error with respect to the radius values from the center coordinate to a measurement point measured based on the calculated average radius value and determining an accuracy of the submarine based on the calculated error, . The method of claim 8,
Further comprising a setting unit configured to set a reference coordinate system for the target so that a measurement result expressed by one identical coordinate system can be obtained at any point where the target is installed. The method of claim 8,
Wherein three or more targets are provided when the measurement space is a floating structure or an upper portion of a structure where the installation location of the measurement equipment flows, and two targets are provided when the measurement space is a fixed ground surface. Of the submarine. The method of claim 8,
The measuring unit
Wherein measurement points are provided along a circumferential direction of the submarine to measure a degree of roundness of a plurality of circumferential positions at an arbitrary interval in a longitudinal direction of the submarine. The method of claim 8,
Wherein the target includes a first target disposed at an end of a bar jig provided at a position where it is impossible to target and collimate by other interference and a second target disposed at a designated position on the bar jig .

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