Design Modeling And Experimental Verification Of UAV Lidar Rubber Shock Absorber

Large-load unmanned aerial vehicles can carry a variety of mission load devices,equipped with corresponding load devices,and the drones can realize the corresponding functions.During the take-off and flight phases of the drone,especially during the flight phase,the working conditions and environment have become more and more demanding and severe.In order to meet the requirements of the unmanned aerial load in various harsh working environments,it is very important to carry out the necessary vibration test and vibration protection for the laser radar.The extensive use of finite element analysis methods provides a reference for the design and simulation of rubber structural parts,and the nonlinear simulation accuracy of rubber materials directly affects the performance of the damping structure.Therefore,studying the constitutive model and finite element simulation method of rubber vibration-damping structural parts,and improving the finite element simulation accuracy of rubber structural parts are of great significance for the performance analysis of rubber vibration-damping structures.In this paper,the structural design of the installation and vibration reduction requirements of the UAV laser radar is carried out The rubber damper is used for vibration reduction,and the environmental performance of the installation damping platform is analyzed by the finite element method.After that,the vibration test and the outdoor flight test of the unmanned aerial vehicle vibration-damping platform were carried out to verify the environmental performance of the installed vibration-damping platform.The application of the vibration-damping design of large-load unmanned aerial vehicles and the design of rubber structural parts have important engineering practical significance.Mainly completed the following work:(1)Firstly,based on the main object of this paper,the dynamic model of the UAV laser radar is established,and the dynamic equation of the model is derived.Under the steady harmonic effect,the transmission rate of the damping structure is derived and the vibration reduction theory is obtained.Secondly,the constitutive model needed for numerical analysis of rubber materials is introduced,and the principle of parameter fitting between the results of different experimental tests and the corresponding constitutive models is derived.(2)According to the requirements of the use of laser radar,the installation platform is first designed,and the kinetic characteristics are obtained by modal analysis and frequency response analysis.According to the characteristics,the random vibration under real conditions is comprehensively judged.Secondly,the actual vibration condition test of the prototype of the drone is tested to test the vibration response of the laser radar installation position,and random vibration analysis is performed.Although the installation platform provides suitable installation space,it is obtained from the results of real vibration response that the platform cannot meet the requirements for the environmental use of lidar,and vibration reduction design is required.It is known from the known actual vibration condition frequency components that the acceleration response transmitted to the mounting platform is a vibration signal of 100Hz and its multiple frequency,and the acceleration amplitude is large at 100Hz,the damping structure is designed according to the vibration damping theory by the frequency component(3)According to the design requirements of vibration reduction,the rubber damper is designed,and the finite element simulation method of the rubber structural parts is summarized.According to the simulation requirements,the material parameters of the rubber sample are tested,and the uniaxial tensile test and other biaxial stretching are performed.The test and the plane tensile test were used to fit the parameters of the hyperelastic model,and the DMA test was carried out to test the viscoelasticity of the rubber material with frequency under dynamic response.Using the parameter test results to carry out simulation calculation,the accuracy and characteristics of different analysis methods and test results are obtained.At the same time,the vibration damping performance of the rubber damper is verified which can effectively suppress the vibration response of the drone at 100Hz.(4)Install the rubber damper and the UAV installation platform obtained from the above analysis and test,build the vibration-damping platform of the UAV laser radar,and carry out the finite element analysis and the shaking table test to obtain the rubber reduction.The vibrator can effectively attenuate the vibration response on the laser radar.Finally,the outdoor flight test of the prototype of the drone was carried out to verify the vibration damping performance of the vibration-damping platform installed in the ground take-off phase and the air flight phase of the drone,and good results were obtained.