Multifunctional Design Of Deformable Spoiler Based On Vehicle

Deformable technology is the key to improve vehicle performance and improve its applicability in complex environment.Taking the automobile variant as an example,it can assist the vehicle to adjust its shape at any time according to the changes of external operating environment,reduce wind resistance,improve driving comfort and fuel economy,and meet the needs of multi-task applications.For this reason,the most economical and easily realized deformable vehicle has become a hot topic for scholars.Aiming at the design of deformable automotive spoiler,a new type of automotive spoiler with multiple deformable modes is designed by using multi-point drive and topology optimization technology.The effects of the new type of spoiler on the aerodynamic characteristics of automobiles are studied.(1)Aerodynamic characteristics analysis models of automotive spoiler wings under different working conditions are established.The aerodynamic loads of different configuration spoiler wings are systematically analyzed by means of COMSOL and Matlab simulation technology.The optimum aerodynamic configuration of spoiler wings under different working conditions is obtained,and the functional requirements criteria for the deformation and load-carrying capacity of spoiler wings are established,so that the equivalent bearing capacity of spoiler wings in unit angle deformation is obtained.The bending moment represents the load-carrying capacity of the spoiler wing,and the driving force required to produce the unit deformation of the spoiler wing represents the variant capacity of the deformable spoiler wing.(2)The design model of multi-functional automotive spoiler based on structural optimization technology is established.A flexible multi-point drive structure with multi-condition deformation function and load-bearing capacity is designed.The experimental samples are prepared.An experimental platform including drive system,measurement system and control system is built.The bending deflection angle of deformable spoiler is measured to be(+9.1).The elongation deformation of deformable spoiler is measured.The displacement is 4.8 mm and the contraction displacement is 5.8 mm.The deformation and load-carrying capacity of the deformable spoiler wing are verified by numerical experiments.(3)Designed a deformable spoiler wing measurement and control system based on cRIO,including the hardware and software design of the measurement and control system,and designed a PID control algorithm for the deformation control of the spoiler wing based on the graphical programming tool LABVIEW,which realized the function of adaptive deformation of the spoiler wing.(4)The experimental verification of the deformable spoiler wing is carried out.The deformable spoiler wing's deformable capacity and bearing capacity are measured experimentally.Experiments show that the deformable spoiler can achieve up-down bending and contraction deformations at 165 N/°,165 N/°,310 N/mm and 258 N/mm,respectively.Under the equivalent bending moment load,the initial bending angle of the airfoil is 1.76 degrees,the downward bending angle is 2°,the upward bending angle is 2.2°,the elongation bending angle is 1.6°,the contraction bending angle is 1.12°,and the load-carrying capacity of the deformable spoiler under the five conditions of no-load,up-down bending and contraction deformation is 1.76°.The forces are 31.5 Nm/°,48.5 Nm/°,11 Nm/°,30 Nm/°,48.5 Nm/°,respectively.The maximum error is 14.3% and the minimum error is 6.9%.The main reasons for the error are the processing error and assembly error in the manufacturing process.