A design method for air pillow with adjustable internal air pressure based on temperature change
A design method and temperature change technology, applied in computing, electrical digital data processing, special data processing applications, etc., can solve problems such as inability to maintain geometric shapes
Inactive Publication Date: 2008-09-10
ZHEJIANG UNIV +1
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Problems solved by technology
When encountering bad weather or changes in winter and summer seasons, the change of gas temperature in the air pillow can cause the internal pressure of the air pillow to change, and the geometric shape of the design cannot be maintained
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[0024] The structural analysis of the air pillow includes form-finding analysis and load analysis.
[0025] Take an air pillow in the middle of the roof of the "Water Cube" structure of the National Aquatics Center as an example. For the plane size and grid division of the air pillow, see image 3 . The upper and lower diaphragms are made of ETFE film with a thickness of 0.4mm, and the initial temperature is 15 degrees Celsius.
[0026] The form-finding analysis is carried out on the air pillow, and the equal-stress surface is obtained. Taking the equal-stress zero-state surface as the initial surface of the air pillow, and filling the internal pressure with 550Pa, we can get Figure 4 Pillow shown. The volume of the air pillow is 107.34354m 3 , the sagittal height of the upper membrane is 1.61m, and the sagittal height of the lower membrane is 1.33m, which meets the architectural requirements. The maximum principal stresses of the upper and lower diaphragms are 6.06MPa a...
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The invention relates to an air pillow design method which adjusts the inner pressure of the air pillow according to temperature change, belonging to the structural engineering technique field. The method is characterized in that the method includes the following steps: an inner pressure scope, initial film thickness and rise-span ratio scope are defined; form-finding analysis is carried out to obtain an equal-stress curve and obtain geometrical and physical parameters at least containing air pillow volume, rise-height of an upper film and a lower film, major principal stresses of the upper film and the lower film and the present inner pressure of the air pillow; whether the film material stress level requirement is met is judged; the changes of the geometrical and physical parameters when the air pillow is respectively arranged in the positive air pressure, the negative air pressure and the concentrated load are analyzed to obtain the stress distribution and the distortion of the air pillow and judge whether the film material stress level requirement is satisfied. The air temperature-the inner pressure curve of the air pillow is calculated so as to obtain the change values of inner pressure under temperature changing from the curve, and then air charging or air discharging are carried out according to the inner pressure changing to guarantee the normal work of the air pillow. The method is practical, safe and reliable.
Description
technical field [0001] The invention relates to an air pillow design method for adjusting the internal pressure of the air pillow according to temperature changes, and belongs to the technical field of structural engineering. Background technique [0002] In recent years, membrane materials made of ethylene-tetrafluoroethylene copolymer ETFE have replaced traditional glass and other polymer lighting panels for roofs or walls of large buildings. ETFE membrane materials are mainly used in inflatable membrane structures. In practical applications, two or more layers of ETFE membranes are usually used, and the edges are sandwiched and inflated to form an air pillow. As one of the main competition venues of the 2008 Beijing Olympic Games, the building envelope of the National Aquatics Center "Water Cube" adopts ETFE air pillow structure, with an internal and external surface covering area of 120,000 square meters, which is the largest ETFE application project in the world. ...
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IPC IPC(8): G06F17/50
Inventor 袁行飞徐国宏傅学怡
Owner ZHEJIANG UNIV