3D and isogeometric mixed unit modeling method of rifling barrel

A hybrid element and modeling method technology, applied in the field of rifled barrel modeling, can solve problems such as the problem of not realizing the mixed element modeling of three-dimensional solid structure

Inactive Publication Date: 2015-07-22
NANJING UNIV OF SCI & TECH
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Problems solved by technology

However, this method only realizes the Lagrangian transformation of the curve, which can only be used for simple two-dimensional problems, and does not realize the mixed element modeling problem of three-dimensional solid structure

Method used

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  • 3D and isogeometric mixed unit modeling method of rifling barrel
  • 3D and isogeometric mixed unit modeling method of rifling barrel
  • 3D and isogeometric mixed unit modeling method of rifling barrel

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Embodiment Construction

[0042] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0043] combine figure 1 , a three-dimensional isogeometric hybrid element modeling method for the rifled barrel. The rifled barrel includes two parts: the rifling and the barrel body. The rifling part is modeled using the isogeometric method, and the barrel body is modeled using the finite element method. The rifled barrel is obtained The 3D isogeometric and finite element hybrid element model, including the following steps:

[0044] (1) if figure 2 As shown, the rifled barrel is divided into two parts, the rifling and the barrel body, and the geometric parameters and structural parameters of the rifled barrel are determined. The parameters include the diameter of the chamber part d 1 , the length of the drug compartment L 1 , the length of the slope section L 2 , Rifle diameter d 2 , the length of the rifling section L 3 , the type of rifling and the ...

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Abstract

The invention discloses a 3D and isogeometric mixed unit modeling method of a rifling barrel. The rifling barrel is divided into a rifling and a barrel body, an isogeometric unit is used to establish the rifling structure, a Lagrange finite element mesh of the barrel body is obtained by utilizing discrete finite elements. In the isogeometric unit of the rifling, Lagrange transformation is carried out on a connecting curved surface cooperated with the barrel body so that the rifling is effectively connected with the barrel body. The connecting curved surface is a curved surface shared by the rifling and the barrel body. Unit nodes whose coordinates are the same are removed from a model after connection, and nodes are marked again to obtain a complete isogeometric and 3D mixed unit model of the rifling barrel. According to the isogeometric and 3D mixed unit model of the rifling barrel, the accurate geometric shape of the rifling is reserved, more accurate results can be obtained by simulating calculation, and the barrel body can use a mature finite element frame to reduce the modeling time.

Description

technical field [0001] The invention relates to the field of modeling of rifled barrels, in particular to a three-dimensional equi-geometric mixed unit modeling method of rifled barrels. Background technique [0002] From an engineering point of view, barrel weapons can be regarded as super-power special power machinery using special energy sources, that is, through rapid combustion of gunpowder, a large amount of high-energy gunpowder gas is generated in an instant to push the projectile into high-speed screwing along the rifled barrel. The projectile and the barrel originally belonged to an interference fit. After being squeezed into the rifling, they fit closely with the rifling of the barrel. During the movement, a small gap appeared due to wear and tear, which belonged to a clearance fit. It can be seen that the movement process of the projectile in the barrel is a very Complex contact mechanics problems. The existing analysis method is based on finite element, using t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T17/00
Inventor 葛建立过斌孙全兆杨国来吕加王飞周乐
Owner NANJING UNIV OF SCI & TECH
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