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Method for forecasting head thickness of fiber winding composite material pressure container
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A technology for winding composite materials and pressure vessels, which is applied in the field of pressure vessel head thickness prediction, and can solve problems such as inability to accurately predict the thickness of the head section.
Inactive Publication Date: 2011-02-09
HARBIN INST OF TECH
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[0004] The purpose of the present invention is to solve the problem that the existing methods cannot accurately predict the thickness of the head section, and then provide a reliable method for predicting the thickness of the head of a pressure vessel made of filament wound composite materials
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specific Embodiment approach 1
[0065] Specific implementation mode one: as Figure 1~5 As shown, the method for predicting the thickness of the head of a pressure vessel made of a filament-wound composite material described in this embodiment is implemented in the following steps:
[0066] Step A, according to the condition that the total volume of all yarn tapes in the two bandwidths of the pole hole remains constant, a thickness prediction model is established:
[0070] m i (i=1, 2, 3, 4)——undetermined coefficient;
[0071] When winding a composite material pressure vessel, the yarn tapes are tangent to the pole hole in the head section one by one, such as figure 1 As shown; each yarn band between band 1 and band n will pass through point a, and the bands overlap with each other, resulting in the continuous incre...
specific Embodiment approach 2
[0074] Specific implementation mode two: as Figure 1~5 As shown, in step B of this embodiment, it can be seen from formula (1) that in order to solve the undetermined coefficient m i (i=1, 2, 3, 4) requires an equation system consisting of 4 equations, and the undetermined coefficient m is solved by boundary conditions i (i=1, 2, 3, 4) the specific process is:
[0075] Step B1, the equation for determining the thickness of the head at the pole hole:
[0076] When spiral winding is used, the thickness of the barrel section is (when using the general single formula method, the thickness at the pole hole is infinite, but when using the Knoel equation and the general double formula method, the thickness is indeed 0, the above two methods are obviously are inappropriate):
[0077] t R = 2t single no R (2)
[0078] In the formula, t R ——thickness of barrel section;
[0080] t single ——the thickness of yarn piece, constant...
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Abstract
A method for forecasting head thickness of fiber winding composite material pressure container relates to a method for forecasting the head thickness of the pressure container. The aim of the invention is to settle a problem that the prior method can not accurately forecast the thickness of the head segment. The forecasting method of the invention comprises the following steps: according to a condition the total volume of all cotton tapes in the range of two band widths of the pole opening is kept unchanged, establishing a thickness forecasting model: t(r)=m1*r<0>+m2*r<1>+m3*r<2>+m4*r<3>; solving an undetermined coefficient mi(i=1, 2, 3, 4) according to a boundary condition; setting a latitude circle radius r at a random point, and obtaining the thickness at the point of the head segment through substituting into the model. The thickness of the head segment, particularly the width distribution state in two band widths around the pole opening can be effectively forecasted thereby providing an accurate finite element modeling for the structure analysis and the optimal design of the composite material pressure container. The test shows that the forecasting result of the method according to the invention more satisfies the practical thickness distribution condition than the traditional empirical formula (double-formula method).
Description
technical field [0001] The invention relates to a method for predicting the thickness of a pressure vessel head, in particular to a method for predicting the thickness of a fiber-wound composite pressure vessel head, which is a key technology in the technical field of design and manufacture of a fiber-wound composite pressure vessel. Background technique [0002] In order to realize the reusability of a new generation of aircraft in the aerospace field, higher requirements are put forward for the weight reduction of the aircraft itself. Composite material pressure vessels have developed into one of the key components of the aerospace vehicle power system. They occupy a huge proportion both in terms of structural weight and geometric space occupied, and their weight reduction requirements are restricting the new generation of advanced One of the technical bottlenecks in the development and development of engine systems. How to design and manufacture a lightweight composite p...
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