Shape Design And Optimization Of Police Lamps Based On Fluid Simulation Technology

Police lights are usually installed above the roof of special vehicles such as police cars,fire engines,ambulances,etc.,and play a role of warning,clearing,and deterring.With people's requirements for the improvement of the overall aerodynamic performance of special vehicles,the development of aerodynamic performance of police lights at a certain driving speed and whether it meets people's aesthetics also need to be expanded and improved.In this paper,firstly fluid simulation software is used to get simulation data of the three-dimensional model of two common police lights in China with the relevant parameters settings.Then,according to the communication with police officers and the combination of relevant industrial design theory and method,design schemes of six police lights are researched.Then,the simulation is also used on six design schemes,and combined with the theory of kansei engineering and other industrial design methods to comprehensively evaluate the shape of the several designed schemes,an optimal solution is obtained from those schemes with combination of parameters of aerodynamic performance and the aesthetic requirements of people.Finally,the design schemes of optimized police lights are verified and we draw conclusions from this research.The main research contents are concluded as follows:1.According to the domestic and foreign police lights and related research status,the fluid simulation software ANSYS Fluent was used to get aerodynamic simulation data of domestic I-shaped and street eagle-shaped police lights to obtain the data of aerodynamic resistance coefficient and aerodynamic lift coefficient.According to the design requirements of the project,six police lights schemes are designed,and a evaluation method of design and optimization for the above two domestic police lights and six police light schemes is identified for research and gets verification from it.2.Based on the development of fluid simulation technology,firstly aerodynamic simulation on all eight police lights is taken to get the aerodynamic resistance and aerodynamic lift data in the setting environment,and the combination with the aerodynamic knowledge of the vehicle is used to obtain a quantified police light shape design and optimization assessment methods.3.Based on the relevant theories of industrial design,a questionnaire survey method was developed from the people and police officers to evaluate the above appearances of police lights.It refers to the theories of kansei engineering,emotional design,and morphological semantics to get evaluation method for quantifying the shape of a police light.4.Combining the above two aspects of design optimization above,a comprehensive evaluation method is obtained to export an optimized scheme of the designed police lamp,and then the optimized police lamp scheme is put into practical verification and experimental test.The innovation of this article is about the innovative design method and innovative optimization method of the police lights,which combines the aerodynamic simulation of the shape of the police lights with the fluid simulation technology software and the industrialdesign theories,to get the optimized police lights design scheme combined with the fluid simulation technology.The optimization methods and conclusions can also be applied to the shape design,analysis and optimization applications for related special vehicles.Similarly,this subject research provides reference and optimization guidance for the shape design method and optimization application of future police lights and similar products,and provides new exploration ideas for the study of product design.