A method for optimal design of parabolic-arc-shaped head structure

Abstract

The invention provides an optimum structural design method for a parabolic-arc seal head. The method comprises the following steps: 1, setting characteristic parameters and initial design parameters of the parabolic-arc seal head; 2, establishing a two-dimensional geometric model according to the characteristic parameters and the initial design parameters; 3, determining a corresponding function at a minimal stress of the two-dimensional geometric model as an objective function; 4, setting a variable range of the initial design parameters; 5, performing optimized analysis on the initial designparameters by setting constraints and loads so as to obtain stress intensity values corresponding to the initial design parameters by using finite element analysis software; 6, substituting the stress intensity values into the objective function, judging whether the objective function is convergent and meets constraint conditions, if not, modifying the initial design parameters and returning to the step 5; and 7, obtaining the optimized design parameters when the objective function is convergent and meets the constraint conditions.

Description

technical field [0001] The invention relates to an optimization design method, in particular to a parabola-circular arc head structure optimization design method. Background technique [0002] The head is an important part of the pressure vessel. The head in the national standard GB150 "Pressure Vessel" includes an oval head, a dish head, a spherical cap and a hemispherical head. Among them, it is recommended to use the standard elliptical head with the ratio of the major and minor axes of 2 for the elliptical head, which has good comprehensive performance and is the most widely used; the spherical head is mostly used for pressure vessels with high pressure, and its stress distribution is good, but It is difficult to manufacture; the dish-shaped head is composed of a middle spherical surface and a corner with a certain radius, and its stress state is not as good as that of the elliptical head, and its use is limited; the stress state of the spherical cap-shaped head is far i...

AI Technical Summary

Problems solved by technology

Among them, the elliptical head is recommended to use the standard elliptical head with a ratio of major to minor axis of 2, which has better comprehensive performance and is the most widely used; the spherical head is mostly used for pressure vessels with higher pressure, and its stress distribution is good, but It is more difficult to manufacture; the dish-shaped head is composed of an intermediate spherical surface and a corner with a certain radius, and its stress state is not as good as that of the elliptical head, and its use is limited; the force state of the spherical head is far less than that of the hemispherical head. , but because of its shallow depth and easy molding, it is also used in some occasions

[0003] In order to solve the above problems, the structure of the parabolic-arc head is proposed, but if the parabola and the arc of the parabolic-arc head are slightly changed, the shape of the head will change, and a slight shape change is sometimes for the bearing. Pressure performance has a huge impact

The existing design methods are generally based on the classical mechanics theory, combined with the experience of the designer to improve the design of the structure of the parabolic-arc head. Obviously, such a design method cannot obtain a truly optimal structure

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