The Static And Dynamic Characteristics Analysis And Structure Optimization Of YGPPZ Type Amusement Equipment Slewing Device

This paper takes the research and development of YGPPZ amusement equipment of a amusement equipment manufacturer as the research background,the slewing device of the amusement equipment is taken as the research object,and the research of static and dynamic characteristics analysis and structural optimization of the slewer can provide reference for the structural analysis and optimization of similar devices.The mechanics related theory and finite element technology was used to analyze and simulate the different working conditions,force conditions and constraint conditions of the structure of the slewing device in the process of movement,and the most dangerous working condition of the structure in normal operation is obtained.Taking the most dangerous working condition as the condition of the follow-up analysis and research of the slewer,the first 10 order natural frequency and mode characteristics of the slewer are obtained by modal analysis.The harmonic response curve of the rotary device is obtained by harmonic response analysis,it is clear that Y-direction vibration is the main vibration direction of the slewer,and the third natural frequency is defined as the dynamic stiffness of the slewing device,and excitation load frequency which is easy to cause structural resonance.Transient dynamics analysis of spindle stress and displacement changes with time at startup stage,there is a wide range of stress concentration at the bearing support and keyway of the spindle about 5.4 seconds after the spindle start,the maximum stress occurs at the intersection of keyway extrusion surface and bottom surface,but its value exceeded the permitted value.The maximum total displacement occurs on the outer circumference of the spindle shoulder about 3 seconds after the spindle start,and its value is 0.16058 mm;the maximum Y-direction displacement of the spindle is 0.15989 mm and the absolute value of the maximum displacement in the-X-direction of spindle is 0.15956 mm about 3 seconds after the spindle start,occurring on the right side of the spindle shoulder,the lower sides of the spindle shoulder and the upper side of the squeezed surface of the keyway respectively;the spindle rocker arm end is subject to the resultant of gravity force and centrifugal force of the rocker arm and its load about 6 seconds after the spindle start,therefore its Y-direction maximum displacement reaches 0.1244 mm.The trend of maximum stress and maximum displacement change with time is basically the same.The static analysis shows that the bearing capacity of the slewer are surplus which is suitable for further optimization.The minimum flexibility of the spindle is taken as the optimization objective of the spindle topology optimization in this paper,and the optimized areas and dangerous position were obtained,the minimum inner diameter of the counterweight end of the spindle was taken as the inner diameter of the whole axis by analyzing the force and topology optimization effect of the spindle.The parameter correlation analysis of the key components of the turning device is carried out,and the key test factors are identified as design variables.The approximate volume of the rotary device is taken as the objective function,minimize the target function when the constraint conditions are satisfied,and establishing mathematical model.The improved fast particle swarm optimization algorithm based on MATLAB platform and the updated global optimization algorithm based on ISIGHT platform approximation model were respectively used to solve the problem and get the optimal solution that satisfies the objective function minimization respectively.Descriptive sampling of the monte carlo sampling technique was also used for 6 sigma quality analysis of the optimal solution obtained by the two optimization algorithms.The sigma level of the optimal solution with high reliability is 1.6258,and the reliability is 0.8966,6 sigma optimization based on simulated annealing algorithm was carried out for the optimization solution with high reliability,then 6 sigma quality analysis and finite element analysis were performed for the optimal solution after optimization.The results show that the sigma level of the slewer is 8,the maximum equivalent stress was reduced by 44.99%,and the mass reduction by 9.3%.The dynamic stiffness changes from the third-order natural frequency 33.882 Hz before optimization to the fourth-order natural frequency 52.502 Hz after optimization.It is proved that the mechanical properties of the device have been effectively improved,and the anti-low frequency interference ability has been further enhanced.