Performance Analysis And Application Research Of UAV Engine Motion Test Platform

Under the influence of load,air intake conditions and low Reynolds number at high altitude,the fuel supply,combustion and lubrication capacity of the UAV engine are easy to enter the unstable working area under the adjustment of flight altitude and pose and the change of ambient temperature.As a result,the engine performance deteriorates,the working requirements cannot be met for a long time,and even the engine failure and damage are aggravated.In order to test the motion characteristics of the engine of oil-powered UAV,a 3-PUS-PS parallel motion test platform adapted to the motion characteristics of the UAV engine was proposed.The main research content of this paper is divided into the following aspects:Firstly,according to the position and pose state characteristics of UAV engine in the actual flight environment,the performance index requirements of the motion test platform are analyzed and determined.Combined with the content of dynamic testing and the required motion degree of freedom characteristics,two design schemes of the platform architecture body were proposed,and the 3-PUS-PS parallel mechanism was determined as the optimal scheme to meet the requirements of the UAV engine motion test platform by comparison.The degree of freedom and coupling of the mechanism were analyzed,and the realization form of the overall motion function of the mechanism was determined.Secondly,the kinematic characteristics of the UAV engine motion test platform were analyzed,and the geometric vector relationship was established to obtain the displacement and velocity solutions of the input end of the branch under the change of the position and pose of the end of the mechanism.The displacement and velocity of the driving end were obtained by Matlab calculation,and the correctness of the kinematics calculation results was verified by Adams software.The force Jacobian matrix is established and verified by simulation.The pose workspace of the mechanism configuration was analyzed to meet the performance requirements of the motion test platform.Then,the dynamic equation of the 3-PUS-PS parallel motion testing platform was established using the virtual work principle,and the driving force was analyzed and solved.The results were compared with the simulation values calculated by Adams to verify the correctness of the dynamic results.According to the inverse Jacobian matrix,the dexterity and bearing capacity of the motion transfer were analyzed,and the changing rules of the performance indexes of the flexibility and bearing capacity of the test platform mechanism were analyzed under the different parameters of the mechanism.Finally,the maximum workspace and maximum bearing capacity of the 3-PUS-PS parallel mechanism were taken as the optimization objectives,and the configuration size was optimized.Then,the reasonable size parameters satisfying the multi-objective requirements were obtained by using the algorithm,and the statics simulation and modal characteristics analysis were carried out by ANSYS finite element tool.