AUV shape optimization method based on improved graffiti algorithm

An optimization method and shape technology, applied in the direction of calculation, calculation model, geometric CAD, etc., can solve the problems of long design cycle and time-consuming, and achieve the effect of retaining ability, increasing diversity, and strengthening the ability of local search

Active Publication Date: 2021-02-02
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

The general shape of AUV adopts the design of a rotating body. The design method i

Method used

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  • AUV shape optimization method based on improved graffiti algorithm
  • AUV shape optimization method based on improved graffiti algorithm
  • AUV shape optimization method based on improved graffiti algorithm

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[0082] Step 1, as attached figure 1 As shown, refer to the common AUV shape, adopt the Myring shape design with small resistance and low energy consumption, and establish the mathematical model of AUV shape design as follows:

[0083] The bow curve equation of the Myring shape is as follows:

[0084]

[0085] The equation of the middle curve of the Myring shape is as follows:

[0086]

[0087] The stern curve equation of the Myring shape is as follows:

[0088]

[0089] In the above three curve equations, a is the length of the bow, b is the length of the middle, c is the length of the stern, d is the diameter of the middle, and the unit is millimeter (mm) for a more precise shape. θ is the stern wrap angle in degrees (O), and m is the Myring coefficient.

[0090] Design space exploration, there is no fixed value space for the 6 parameters of the model, the design space is initially determined as a: [100,800], b: [500,2000], c: [200,1000], The value of d is genera...

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Abstract

The invention relates to an AUV shape optimization method based on an improved graffiti algorithm, and the method comprises the steps that: the main body shape design of an AUV is divided into three parts: a bow curve, a central curve, and a stern curve segment, the mathematical model is used for controlling the shape of the AUV through six parameters, the value of a resistance coefficient is obtained through fluid calculation, the six parameters are iteratively optimized through an improved graffiti algorithm, and the six optimal control parameters are found. According to the invention, in adesign space, based on the resistance coefficient, a more optimized AUV shape can be found.Compared with a traditional graffiti algorithm, an inverse-based learning strategy is introduced, the local search capability is enhanced, and a more optimized shape can be found in a design space based on a resistance coefficient. Compared with a traditional graffiti algorithm, another small parameter is introduced, the graffiti random flight capacity is reserved, population diversity is improved, optimization can be prevented from falling into local optimum, and a better optimization result is obtained.

Description

technical field [0001] The invention belongs to the field of underwater vehicles and relates to an AUV shape optimization method based on an improved crow algorithm. Background technique [0002] Unmanned autonomous underwater vehicle (AUV) is a new type of intelligent underwater robot, which has the advantages of strong autonomy and high maneuverability. It was widely used in the military field in the early days, mainly for underwater mine clearance, monitoring and target tracking. With the development of related technologies, the scope of application is more and more extensive, and it has broad prospects in the exploration of seabed resources, investigation of seabed topography and environment, and marine defense strategy. The general shape of AUV adopts the design of a rotating body, and the design method is mainly the curve family method, but the design cycle is long and time-consuming. With the continuous improvement of AUV performance requirements, it is of practical...

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Application Information

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IPC IPC(8): G06F30/15G06N3/00G06F111/10G06F119/14
CPCG06F30/15G06N3/006G06F2111/10G06F2119/14
Inventor 王鹏谭国潘董华超宋保维李天博
Owner NORTHWESTERN POLYTECHNICAL UNIV
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