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A method and system for measuring ship freeboard based on laser technology

A ship and shipboard technology, applied in the field of ship freeboard measurement method and system based on laser technology, can solve the problems of high ship type requirements and inability to accurately determine the measurement point

Inactive Publication Date: 2021-03-16
BEIJING SEECOOL TECH CORP LTD
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Problems solved by technology

This method has high requirements on the ship type, but in practice, most cargo ships have various shapes and different cargoes, which leads to the inability to accurately determine the measurement points that should be taken during modeling

Method used

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  • A method and system for measuring ship freeboard based on laser technology
  • A method and system for measuring ship freeboard based on laser technology
  • A method and system for measuring ship freeboard based on laser technology

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Embodiment Construction

[0050] see below Figure 1 to Figure 8 The method and system for measuring ship freeboard based on laser technology described in the present invention will be described in detail.

[0051] Such as figure 1 As shown, the method includes the following steps:

[0052] S101: Preprocessing the data collected by the laser sensor.

[0053]combine figure 2 As shown, at least two laser sensors are installed on the lower end of the bridge corresponding to the passing position of the ship. In the figure h 1 Indicates the vertical distance from the water surface to the laser sensor, h 2 Indicates the vertical distance from the ship's side to the laser sensor, L indicates the straight-line distance from the laser sensor to the measured object (ship's side), r indicates the deviation angle of L in the vertical direction, h 2 =L*cos(r). h 3 Indicates the height of the ship's side, h 3 = h 1 -h 2 .

[0054] Every time the laser sensor scans, it generates data for one scan cycle. ...

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Abstract

The invention provides a determination method for a ship freeboard based on a laser technology. The method comprises the following steps: step A. obtaining an image of a scanning point of a target ship based on collected data of a laser sensor, and distinguishing a line in the vertical direction and the line in the horizontal direction located on the target ship; B. separately determining a vertical plane and a horizontal plane of the target ship based on the distinguished lines in the step A; and C. separately selecting scanning points representing a position of a shipboard of the target shipin the vertical plane and the horizontal plane, and selecting one as the position of the shipboard of the target ship based on different conditions, and determining a freeboard of the target ship. Asystem for implementing the method is also correspondingly provided, ship-related data are collected by the laser sensor, the data are processed to obtain a position of the shipboard, and an optimal position of the shipboard is selected as a freeboard measurement value of a ship based on the different conditions. The determination method is more accurate than inaccurate data measured by a complicated scheme by 3D modeling and then taking a deck height in the prior art.

Description

technical field [0001] The invention relates to the technical field of ship monitoring, in particular to a method and system for measuring ship freeboard based on laser technology. Background technique [0002] In the existing technology for measuring the height of the ship's side, firstly, the ship is scanned with a laser to form a point cloud image, and then the point cloud image of the ship is analyzed to find the approximate position of the ship's side, and the deck height is obtained. Combined with the height from the water surface to the laser, the height of the deck part from the water surface can be calculated, which corresponds to the freeboard of the ship. This data is still an important basis for the department to measure whether the ship is overloaded or over-drafted. [0003] When calculating the freeboard height of a ship, firstly through 3D modeling, and then take the deck height. This method has high requirements on the ship type, but in reality, most cargo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S17/48G01S17/88
Inventor 晁毅博闫岩冯昊王运松何瑞龙刘子光
Owner BEIJING SEECOOL TECH CORP LTD
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