Design And Experimental Study Of Three Degree Of Freedom Stable Platform

Three-degree-of-freedom stability platform is a kind of positioning and tracking device commonly used in semi-physical simulation experiment,which occupies an important position in scientific research field.The positioning accuracy of the stable platform is affected by its own structure and dynamic characteristics,which is the main performance indicators.In this paper,the main reason of the driving torque is analyzed by the dynamic software,and the mechanical analysis of mechanical structure is analyzed by using the finite element software.On the basis of the theoretical analysis,a new structure is proposed to reduce the power.The details are as follows:Firstly,the mechanical structure of the stabilization platform is designed.Through several typical structure of the contrast,clear their respective characteristics,the initial establishment of three-dimensional model.The shaft system is merged into parts according to the motion relation between the structures.And the influence of gravity and movement state as the driving torque,the motion law of each shaft is given and the dynamic simulation is carried out to obtain the torque curve in the corresponding state of each shaft.Excluding the interference of gravity factors,the azimuth axis is the most significant influence in the Three-axis coupling motion,and the roll axis is least affected,and the main factor that increases the power consumption is the eccentric moment caused by gravity.Second,the original model to simplify the second,to remove the part in the analysis of the results of a slight impact of on the structure and part of the non-carrying parts,the bearing and other standard parts for equivalent treatment,set the contact between parts,add external load and constraints on the turntable After the completion of these work,the turntable overall structure of the static analysis,the limit position of the stress,strain diagram.Analyze whether the maximum stress,the deformation is within the allowable range.Once again,processing prototype,the load quality equivalent to fixed on a stable platform.The parameters of the shaft are set and the equipment is tested.The experimental data are compared with the simulation results.The validity of the simulation and the causes of the error are analyzed.Summarize and improve the simulation experience,and provide reference for the future simulation design of high power stable platform.Finally,in order to reduce the driving power effectively,the virtual axis structure is proposed on the basis of theoretical and physical research.The theoretical basis is that the center of mass of the motion axis coincides with its rotation center,and the eccentricity caused by gravity is reduced to zero in theory.The virtual axis turntable simulation data and the traditional turntable experimental results were compared and found that the structure can use its own characteristics greatly reduce the motor power.