Dynamics Optimization And Lightness Research Of Energy-saving Racing Body

The rapid development of the automobile industry has led to the growth of car ownership,meanwhile the consumption of energy is greatly increasing.In order to alleviate the energy crisis,the world’s major automobile manufacturers began to make electric vehicles and hybrid vehicles,and actively research and development of new energy.To the development of the modern automobile,energy saving has become a consequent trend.In this context,China’s energy saving athletic competition arises at the historic moment,it not only improve the students’ practical ability,but also provide a new idea for the design of the car,at the same time to enhance the awareness of environmental protection.With the progress of technology and application of new materials in the car,the vehicle weightdeclining,the speed has been greatly improved,and fuel consumptionreducing,in order to save fuel,participants pay more attention to the aerodynamic performance of the vehicle in the design process of the car.When the car is racing on the track,it will be affected by the air force and other interaction forces from the air,which has a great influence on the fuel consumption,power and handling stability.Therefore,a good aerodynamic design can effectively guide the surrounding airflow,reduce the pneumatic resistance and fule consumption,improve vehicle performance.In this paper,we take the racing body of the ninth Honda China Eco Mileage Challenge as the research object,and uses the finite element analysis software to carry on the modal analysis and the outflow filed numerical simulation of the racing body,and according to the numerical simulation results of the car body to local improvement.First of all,the racing body geometry model is bulided by CATIA three-dimension modeling software,and the car body modal is analysed by ANSYS software,ensure that the car does not resonate with the frequency of excitation from the road surface and engine during driving;then the numerical simulation of the aerodynamic of the car is conducted through the FLUENT software,then we can get the aerodynamic drag and aerodynamic drag coefficient,pressure contours,velocity vectors and car body streamline.The aerodynamic drag coefficient is used to evaluate the aerodynamic performance,and analyze the results of numerical simulation,finally optimize the car body according to the velocity vectors andstreamline.According to the results,make the local modification of the original body,compared the car body aerodynamic drag coefficientafter optimization,the aerodynamicdrag coefficient of car body decreased after the optimization,and the lightweight design of the car is described,which provides a theoretical basis for the next body design of the energy-saving car.