Car body aerodynamic modeling optimization method based on free deformation technology

Abstract

The invention discloses a car body aerodynamic modeling optimization method based on free deformation technology, comprising the following steps: firstly, constructing a simplified car body model, wherein points needing deformation control on the car body model is taken as design variables, setting boundary control conditions for the design variables, and obtaining a certain number of car body model samples according to the boundary control conditions; obtaining the car body model of the schemes by utilizing a free deformation method and solving the corresponding Cd value; then constructing an approximate model, solving the optimal solution of the approximate model by utilizing an optimization algorithm, re-constructing the car body model according to the position of a control point with optimal solution and obtaining the air resistance coefficient Cd value, comparing the air resistance coefficient Cd value with the Cd value of a simplified original model, and if the value is not reduced, returning to S2 to modify the boundary conditions or re-select the design variables to continue the procedure. By utilizing the optimization method disclosed by the invention, car body optimization is easy to control, and in certain boundary conditions, the optimization result is relatively reliable.

Description

Technical field [0001] The invention belongs to the field of automobile aerodynamics and the field of automobile modeling optimization, and in particular relates to a vehicle body aerodynamic modeling optimization method based on free deformation technology. Background technique [0002] The existing optimization method of automobile body shape mainly relies on the designer’s experience and the predecessor’s summary of the design experience. This traditional design method has many shortcomings. It not only has a long development cycle, but also cannot be under certain boundary conditions. Determine whether the optimized model is the optimal result. If the geometric shape parameterization method is used to study the car body shape, because the traditional parameterization method is more mature in the control of curve deformation, but the ability in surface deformation is not satisfactory, so it is impossible to obtain a better aerodynamic shape of the car body. Summary of the inv...

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Problems solved by technology

[0002] The existing optimization method of automobile body shape mainly relies on the experience of the designer and the summary of the design experience of the predecessors. This traditional design method has many shortcomings, not only the development cycle is long, but also cannot be achieved under certain boundary conditions Determine whether the optimized model is the optimal result

If the geometric shape parameterization method is used to study the body shape, because the traditional parameterization method is more mature in controlling the curve deformation, but the ability in the surface deformation is not satisfactory, so it is impossible to obtain a better aerodynamic shape of the car body

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