Novel method for predicting deformation shape and bag cloth stress of balloon in stratosphere

Abstract

A novel method for predicting a deformation shape and bag cloth stress of a balloon in the stratosphere comprises the steps of 1 establishing the relation of warp-wise stress and weft-wise stress of bag cloth and a deformation shape function according to a stress balance equation of the whole balloon; 2 establishing a geometric model describing the deformation shape and giving out a specific expression of the deformation shape function; 3 establishing a total-potential-energy function of a balloon system; 4 solving undetermined parameters in the expression of the deformation shape function according to a principle of minimum potential energy; 5 substituting determined parameters into the expression of the deformation shape function, namely confirming the deformation shape of the balloon and further confirming the warp-wise stress and the weft-wise stress of the bag cloth. The novel method for predicting the deformation shape and the bag cloth stress of the balloon in the stratosphere is simple and practical, and the deformation shape and the bag cloth stress of the balloon in the stratosphere can be easily obtained only by substituting bag cloth material parameters of the balloon, geometric parameters when the balloon is free of load, inner air parameters and load into the model.

Description

Technical field [0001] The invention provides a new method for predicting the deformed shape and the stress of the balloon in the stratosphere, belonging to the technical field of mechanical analysis and design. Background technique [0002] A balloon is a low-cost, high-efficiency aircraft. Its main lift comes from its own buoyancy. Therefore, it can carry out flying missions with very little fuel, and its transportation costs are low. It has a very broad application prospect. Predicting the mechanical properties and failure mechanism of balloons has become one of the hotspots in recent years. Accurately assessing the deformation shape of the balloon and the stress of the balloon cloth is very important in the design stage. At present, engineers mainly solve this problem through experiments, numerical simulation and analytical methods. Through the scaled model or the real-size balloon flight test, although the deformed shape and the balloon cloth stress can be measured, the fli...

AI Technical Summary

Problems solved by technology

Although the deformed shape and capsule cloth stress can be measured through a scaled model or a real-scale balloon flight test, the cost of the flight test is relatively high and the cycle is long. The following flight tests are only equivalent to the verification and correction of the design method; the numerical simulation method needs to establish a complex finite element model, the calculation is complicated, the calculation efficiency is low, and it is not convenient for engineers to apply; There is a lack of analytical methods for assessing the deformed shape and capsule stress of balloons. Therefore, the present invention proposes a new method for predicting the deformed shape and capsule stress of stratospheric balloons. This method is very simple and practical, and only needs the balloon The material parameters of the capsule cloth, the geometric parameters when the balloon is not under load, the internal gas parameters and the load are substituted into the model, and the deformed shape of the balloon and the stress of the capsule cloth can be easily obtained. It can be seen that the present invention has important academic significance and engineering application value

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