Reverse modeling method of complicated folding fabrics based on FSI (fuel stratified injection)
A reverse modeling, fabric technology, applied in special data processing applications, instruments, electrical digital data processing, etc., to achieve reliable results
Inactive Publication Date: 2013-12-25
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology
[0003] The purpose of the present invention is to solve the problem of special airbag modeling in view of the defects existing in the prior art, and to provide a reverse modeling method for complex folded fabrics based on FSI
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Embodiment Construction
[0033] Let's take a special airbag as an example to model
[0034] First, use the pre-processing software to divide the mesh of the airbag, use triangular elements to divide the airbag, divide the flow field with hexahedrons, segment the mesh of the airbag, and perform folding modeling on one section ( figure 1 shown).
[0035] The FSI model is established for the above-mentioned airbag, and the fluid is set to act on the airbag body from the top of the airbag downward. The inlet gas is air with a temperature of 298K, its velocity is 50m / s, and its mass flow rate is 12m 3 / s. The material of the folded part is set to fabric, the modulus of elasticity is 5E8Pa, Poisson's ratio is 0.2, and the density is 870kgm 3 , and the rest are set as rigid bodies.
[0036] During the deformation process of the capsule, the instantaneous unit whose strain is small and the folded height is within the allowable range is exported ( figure 2 ). Fine-tuning is performed in the pre-processi...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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The invention discloses a reverse modeling method of complicated folding fabrics based on FSI (fuel stratified injection). The method comprises the following steps: (1) an air bag completely or partially unfolded is divided into grids; (2) the segmentation fluid solid coupling calculation is carried out on the air bag; (3) an air bag body unit of which the strain is less and the height after folded is in the allowable range is instantly led out; (4) the fine adjustment is carried out on the air bag body units so as to eliminate the intersecting and overlapping phenomena among the air bag body units; and (5) the folded air bag body is set into a rigid body, and the residual parts are processed by adopting the steps from (2) to (4) until the reverse folding of the air bag body is finished. Because a fluid solid coupling reverse modeling technique is adopted to carry out the folding modeling on the complicated folding air bag for the first time so as to effectively simulate the complicated natural winkles in multi-dimensional space, thereby solving the air bag modeling problems of large shaft diameter ratio and special requirements on the existing complicated folding condition, and greatly enhancing the simulation success rate of the special air bag in the working course.
Description
technical field [0001] This modeling method involves the reverse modeling research of folded fabrics. For the first time, the reverse modeling technology based on fluid-solid coupling is used to simulate the shape of the airbag when it is not deployed, effectively simulating the complex natural folds in multi-dimensional space, and solving the folding problem of special airbags. Background technique [0002] Modeling is an important part of the computational simulation process, and generally modeling takes more than half of the entire simulation process. The quality of the airbag model will directly affect the change of the shape of the airbag during the inflation process, and whether the final simulation is successful. Currently, airbag folding methods can be classified into two types: direct folding method and initial matrix method (IMM). The direct folding method establishes the corresponding finite element mesh according to the actual folding method of the airbag, mainl...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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IPC IPC(8): G06F17/50
Inventor 余莉程涵张绳刘雄呼政魁
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS