CN109186534B - Method for measuring and calculating irradiation angle of ship navigation lamp - Google Patents
Method for measuring and calculating irradiation angle of ship navigation lamp Download PDFInfo
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- CN109186534B CN109186534B CN201811063199.7A CN201811063199A CN109186534B CN 109186534 B CN109186534 B CN 109186534B CN 201811063199 A CN201811063199 A CN 201811063199A CN 109186534 B CN109186534 B CN 109186534B
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- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C1/00—Measuring angles
Abstract
The invention discloses a method for measuring and calculating the irradiation angle of a ship navigation lamp, which comprises the following steps: firstly, measuring at least four hull central points by using a total station, and correcting the hull central points to obtain hull central lines; marking a hull center line beside the measured navigation light, drawing an extension line of the inner side surface of a lamp holder base plate of the measured navigation light, shifting the extension line in parallel to intersect with the marked hull center line to obtain a first intersection point, drawing an extension line of the front end surface of the lamp holder base plate, intersecting the extension line with the extension line of the inner side surface of the lamp holder base plate to obtain a second intersection point, intersecting with the hull center line to obtain a third intersection point, and measuring the distance from the second intersection point to the first intersection point and the distance from the second intersection point to the third intersection point respectively; and step three, calculating the included angle between the inner side surface of the lamp holder base plate and the center line of the ship body through a trigonometric tangent function. The measuring and calculating method does not need complex instruments and equipment, has simple measuring and calculating process and very low cost.
Description
Technical Field
The invention relates to a method for measuring and calculating the irradiation angle of a ship navigation lamp.
Background
According to the regulations of the national ministry of transportation, the red light lamp and the green light lamp of the starboard, which are arranged on the left side and the right side of the highest deck of the ship, respectively display uninterrupted light within a horizontal arc of 112.5 degrees, and the device is used for respectively displaying the light from the front of the ship to the position 22.5 degrees behind the straight transverse beam of one side. The light shading plate of the sidelight should be painted with a dull black paint on the surface facing the light. The height of the shading plate is at least equal to the height of the lamp. Therefore, the irradiation angle of the navigation light is measured after a bow ship is built. The sidelight in the navigation light is installed on the lamp holder by a special bulb, and the structure and the size of the lamp holder are in accordance with relevant regulations of ship regulations and international convention. The lamp holder is composed of a rectangular bottom plate and a shading plate fixed on the bottom plate. Therefore, when the sidelight is installed, it is important to control the installation angle of the bottom plate. At present, the irradiation angle measurement of the ship navigation lamp is carried out in a way that a barge surrounds the ship and is carried out when the ship is tested to an anchoring ground or when the ship is parked at a wharf. The ship needs to follow the barge to an anchoring ground during test sailing, and the angle measurement of the sailing lamps on the two sides of the port and the starboard can be completed only by turning around and steering the ship to be tested at a wharf. In any case, the method is very labor-intensive and greatly influenced by weather. In the measurement process, targets in and out of one sea are observed by naked eyes, and visual inaccuracy is caused by poor visibility or wave height of weather.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide the method for measuring and calculating the irradiation angle of the ship navigation lamp, which does not need complex instruments and equipment, has simple measurement and calculation process and very low cost.
The purpose of the invention is realized as follows: a method for measuring and calculating the irradiation angle of a ship navigation lamp comprises the following steps:
step one, finding out a center line of a hull, firstly, uniformly measuring at least the broadside widths of four hulls at intervals from a bow to a stern by adopting a total station along the length direction of the hull, respectively carrying out center division on the width of each hull to obtain the midpoint of the broadside width of each hull, then connecting the midpoint of a first hull closest to the bow and the midpoint of a last hull closest to the stern into a straight line to be used as an initial hull center line, then measuring the deviation values of the midpoints of the hulls in the middle and the initial hull center line, and then correcting the initial hull center line by the arithmetic mean value of the deviation values to obtain a final hull center line;
marking the final ship body center line beside the measured navigation light, drawing an extension line of the inner side surface of a lamp holder base plate of the measured navigation light, parallelly shifting the extension line to intersect with the marked ship body center line to obtain a first intersection point, drawing an extension line of the front end surface of the lamp holder base plate, intersecting the extension line with the extension line of the inner side surface of the lamp holder base plate to obtain a second intersection point, intersecting with the ship body center line to obtain a third intersection point, and respectively measuring the distance M from the second intersection point to the first intersection point and the distance N from the second intersection point to the third intersection point;
and step three, calculating an included angle alpha between an extension line of the inner side surface of the lamp holder base plate of the navigation lamp to be measured and the center line of the ship body by a trigonometric tangent function formula tan alpha being N/M, and judging whether the navigation lamp to be measured meets the specified irradiation angle.
The method for measuring and calculating the irradiation angle of the ship navigation lamp comprises the following steps of replacing the first step with a step of measuring the broadside width of the front end of each single cabin by using a total station as a measuring reference surface, obtaining a front middle point after the division, measuring the broadside width of the rear end of each single cabin by using the total station, obtaining a rear middle point after the division, connecting the front middle point and the rear middle point into a straight line to obtain the center line of each single cabin, and correcting the deviation value of the center line of each single cabin to obtain the final ship body center line.
According to the technical scheme of the method for measuring and calculating the irradiation angle of the ship navigation lamp, complex instruments and equipment are not needed, visual inspection by naked eyes can be replaced by accurate calculation, the measuring and calculating process is simple, the influence of weather factors such as waves and the like is not needed to be considered, and the cost is very low.
Drawings
FIG. 1 is a schematic diagram of a step I of the method for measuring and calculating the irradiation angle of the ship navigation light according to the present invention;
FIG. 2 is a schematic diagram of a second step of the method for measuring and calculating the irradiation angle of the navigation light of the ship according to the embodiment of the present invention;
fig. 3 is a schematic diagram of a second step of the method for measuring and calculating the irradiation angle of the ship navigation light according to another embodiment of the present invention.
Detailed Description
The invention will be further explained with reference to the drawings.
Referring to fig. 1 and fig. 2, an embodiment of the method for measuring and calculating an irradiation angle of a ship navigation light according to the present invention includes the following steps:
step one, finding out a center line of a hull, firstly, uniformly measuring at least the broadside widths of four hulls at intervals from a bow to a stern by adopting a total station along the length direction of the hull, and respectively carrying out division on the width of each hull to obtain the broadside width of each hull midpoint A, B, C, D (see figure 1), then connecting a first hull midpoint A closest to the bow and a last hull midpoint D closest to the stern into a straight line AD to be used as an initial hull center line, then measuring deviation values of the middle hull midpoints B, C and the initial hull center line AD, and then correcting the initial hull center line by using the arithmetic mean value of the deviation values to obtain a final hull center line;
marking the final ship body center line beside the measured navigation light, drawing an extension line of the inner side surface of a lamp holder base plate of the measured navigation light, parallelly shifting the extension line to intersect with the marked ship body center line to obtain a first intersection point O1, drawing an extension line of the front end surface of the lamp holder base plate, intersecting the extension line and the extension line of the inner side surface of the lamp holder base plate to obtain a second intersection point O2, intersecting with the ship body center line to obtain a third intersection point O3, and respectively measuring a distance M from the second intersection point O2 to the first intersection point O1 and a distance N from the second intersection point O2 to the third intersection point O3 (see figure 2);
and step three, calculating an included angle alpha between an extension line of the inner side surface of the lamp holder base plate of the navigation lamp to be measured and the center line of the ship body by a trigonometric tangent function formula tan alpha being N/M, and judging whether the navigation lamp to be measured meets the specified irradiation angle.
Another embodiment of the method for measuring and calculating the irradiation angle of the ship navigation light of the invention is a container ship, and comprises the following steps:
step one, taking a hatch cover of each single cabin on a container ship as a measuring reference surface, measuring the width of the front end of each single cabin by using a total station, obtaining a front middle point after the division, measuring the width of the rear end of each single cabin by using the total station, obtaining a rear middle point after the division, connecting the front middle point and the rear middle point into a straight line to obtain a center line of each single cabin, and correcting deviation values of the center lines of the single cabins to obtain a final hull center line.
Marking the final ship body center line beside the measured navigation light, drawing an extension line of the inner side surface of a lamp holder base plate of the measured navigation light, parallelly shifting the extension line to intersect with the marked ship body center line to obtain a first intersection point O1, drawing an extension line of the front end surface of the lamp holder base plate, intersecting the extension line with the extension line of the inner side surface of the lamp holder base plate to obtain a second intersection point O2, and respectively measuring the distance M from the second intersection point O2 to the first intersection point O1 and the vertical distance P from the second intersection point O2 to the ship body center line (see figure 3);
and step three, calculating an included angle alpha between an extension line of the inner side surface of the lamp holder base plate of the navigation lamp to be measured and the center line of the ship body through a trigonometric sine function formula sin alpha as P/M, and judging whether the navigation lamp to be measured meets the specified irradiation angle.
The method for measuring and calculating the irradiation angle of the ship navigation lamp is based on the fact that the lamp holder structure of the navigation lamp is fixed, and whether the irradiation angle of the navigation lamp meets the requirement or not can be judged by measuring the installation angle of the base plate of the lamp holder. By adopting the method, if the measured navigation light does not meet the specified irradiation angle, the irradiation angle of the sidelight can meet the requirement only by adjusting the installation angle of the base plate of the lamp holder. Therefore, the method is not only suitable for measuring the navigation lamp of a newly-built ship, but also can be used for measuring the displayed angle which cannot meet the requirement due to the fact that the navigation lamp deforms or cannot be vertically erected due to serious overhauling loss and corrosion of the existing navigation lamp or lamp holder for a long time. The measuring and calculating method does not need complex instruments and equipment, can replace visual inspection by accurate calculation, has simple measuring and calculating process, does not need to consider the influence of weather factors such as waves and the like, and has very low cost.
The above embodiments are provided only for illustrating the present invention and not for limiting the present invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and therefore all equivalent technical solutions should also fall within the scope of the present invention, and should be defined by the claims.
Claims (2)
1. A method for measuring and calculating the irradiation angle of a ship navigation lamp is characterized by comprising the following steps:
step one, finding out a center line of a hull, firstly, uniformly measuring the width of at least four hulls at intervals along the length direction of the hull from the bow to the stern by adopting a total station, respectively dividing the width of each hull to obtain the midpoint of each hull, then, connecting the midpoint of the first hull closest to the bow and the midpoint of the last hull closest to the stern into a straight line to be used as an initial hull center line, then, measuring deviation values of the midpoints of the middle hulls and the initial hull center line, and then, correcting the initial hull center line by using the arithmetic mean value of the deviation values to obtain a final hull center line;
marking the final ship body center line beside the measured navigation light, drawing an extension line of the inner side surface of a lamp holder base plate of the measured navigation light, parallelly shifting the extension line to intersect with the marked ship body center line to obtain a first intersection point, drawing an extension line of the front end surface of the lamp holder base plate, intersecting the extension line with the extension line of the inner side surface of the lamp holder base plate to obtain a second intersection point, intersecting with the ship body center line to obtain a third intersection point, and respectively measuring the distance M from the second intersection point to the first intersection point and the distance N from the second intersection point to the third intersection point;
and step three, calculating an included angle alpha between an extension line of the inner side surface of the lamp holder base plate of the navigation lamp to be measured and the center line of the ship body by a trigonometric tangent function formula tan alpha being N/M, and judging whether the navigation lamp to be measured meets the specified irradiation angle.
2. The method for measuring and calculating the irradiation angle of the navigation light of the ship according to claim 1, wherein the first step is replaced by measuring the broadside width of the front end of each individual cabin by using a total station as a measuring reference surface, obtaining the front midpoint after the division, measuring the broadside width of the rear end of each individual cabin by using the total station, obtaining the rear midpoint after the division, connecting the front midpoint and the rear midpoint into a straight line to obtain the center line of each individual cabin, and correcting the deviation value of the center line of each individual cabin to obtain the final hull center line.
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| CN201811063199.7A CN109186534B (en) | 2018-09-12 | 2018-09-12 | Method for measuring and calculating irradiation angle of ship navigation lamp |
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| CN201811063199.7A CN109186534B (en) | 2018-09-12 | 2018-09-12 | Method for measuring and calculating irradiation angle of ship navigation lamp |
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| CN113654511B (en) * | 2021-09-17 | 2023-12-26 | 上海外高桥造船有限公司 | Method for checking installation angle of bow-mounted portlight |
| CN114056505A (en) * | 2021-10-15 | 2022-02-18 | 上海江南长兴造船有限责任公司 | Angle adjusting method for ship starboard light |
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| CN102628687A (en) * | 2012-04-28 | 2012-08-08 | 浙江海洋学院 | Ship horizontal attitude indicator |
| CN103017727A (en) * | 2012-12-22 | 2013-04-03 | 厦门船舶重工股份有限公司 | Detection method for mounting accuracy of ship navigation signal lamp |
| CN106507745B (en) * | 2008-05-30 | 2013-04-10 | 沪东中华造船(集团)有限公司 | A kind of marine shafting irradiation method |
| CN106767670A (en) * | 2015-11-25 | 2017-05-31 | 中航贵州飞机有限责任公司 | Photoelectric nacelle mounting shift angle aids in calibration device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105841688B (en) * | 2015-01-15 | 2018-08-10 | 江苏南大五维电子科技有限公司 | A kind of ship auxiliary anchors alongside the shore method and system |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106507745B (en) * | 2008-05-30 | 2013-04-10 | 沪东中华造船(集团)有限公司 | A kind of marine shafting irradiation method |
| CN102628687A (en) * | 2012-04-28 | 2012-08-08 | 浙江海洋学院 | Ship horizontal attitude indicator |
| CN103017727A (en) * | 2012-12-22 | 2013-04-03 | 厦门船舶重工股份有限公司 | Detection method for mounting accuracy of ship navigation signal lamp |
| CN106767670A (en) * | 2015-11-25 | 2017-05-31 | 中航贵州飞机有限责任公司 | Photoelectric nacelle mounting shift angle aids in calibration device |
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