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Bidirectional interpolation trawlnet curved surface reconstruction and volume element volume calculation method of trawlnet

A volume element and trawl technology, which is applied in the field of two-way interpolation method surface reconstruction and volume element method volume calculation of trawl nets, and can solve the problems of trawl volume calculation and other problems in reconstructing trawl nets without finding trawl surfaces.

Pending Publication Date: 2022-02-15
GUANGXI UNIV OF CHINESE MEDICINE
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Problems solved by technology

[0003] At present, there is no research on the surface reconstruction of trawl nets and the calculation of trawl net volume at home and abroad

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  • Bidirectional interpolation trawlnet curved surface reconstruction and volume element volume calculation method of trawlnet
  • Bidirectional interpolation trawlnet curved surface reconstruction and volume element volume calculation method of trawlnet
  • Bidirectional interpolation trawlnet curved surface reconstruction and volume element volume calculation method of trawlnet

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Embodiment Construction

[0025] In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific illustrations.

[0026] The present invention applies basic interpolation principles such as cubic spline interpolation, cubic Heimite interpolation and periodic polar coordinate interpolation. (1) The simple cubic spline interpolation method causes Range deformation at the tail of the trawl net, and the curve of simple cubic Heimite interpolation is not smooth enough. Therefore, in order to obtain a smooth interpolation curve in the longitudinal direction and make the tail reasonable and realistic without deformation, the interpolation of the key points on the longitudinal trawl surface in the X direction adopts the longitudinal interpolation method combining cubic spline interpolation in the main part and cubic Heimite interpolation in the tail. . (2) On the r...

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Abstract

The invention discloses a bidirectional interpolation trawlnet curved surface reconstruction and volume element volume calculation method of a trawlnet, relates to the technical field of engineering of main fishing gears of marine fishery, and constructs a series of trawlnet curved surface construction technologies and volume estimation methods for solving the problems of curved surface reconstruction and volume estimation after underwater deformation of the trawlnet. By utilizing three-dimensional space coordinates of trawl key nodes obtained in a water tank experiment, the technical methods of a trawl curved surface longitudinal interpolation method combining cubic spline interpolation and three Heimite interpolation, a transverse ring cross section polar coordinate spline interpolation method, a ring cross section method interpolation and a vertical cross section method interpolation and the like are provided, and the average value of the result of the combination of the ring cross section method interpolation and the vertical cross section method interpolation is obtained. The curved surface where the trawl is located is reconstructed, and the trawl volume is calculated after the curved surface is reconstructed by using a finite element thought and a volume element method.

Description

technical field [0001] The invention relates to the engineering technical field of marine fishery, in particular to a surface reconstruction of a trawl net by a two-way interpolation method and volume calculation by a volume element method. Background technique [0002] Trawls are important fishing gear widely used in marine fisheries. The volume of the trawl net directly affects the volume of the filtered water body and the catch. However, the irregular shape of the trawl net, especially the calculation of the volume of the net after underwater deformation, is still a world-class problem and a frontier research topic for pelagic fishing gear. Taking the midwater trawl most widely used in fishing operations as an example, in order to calculate the volume of the trawl, it is necessary to know the spatial coordinates of each mesh on the surface of the trawl, but this is actually impossible underwater. Based on the key coordinate data of the tank trawl experiment, the inventio...

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Application Information

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IPC IPC(8): G06T17/20G06T3/40G06T7/64G06T7/62G06T7/73
CPCG06T17/20G06T3/4007G06T7/64G06T7/62G06T7/73
Inventor 张新峰袁颖李杰汪旭升王剑
Owner GUANGXI UNIV OF CHINESE MEDICINE
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