Simulation Analysis Of Rocket Artillery Traversing Mechanism Gearbox Vibration And Noise And Its Optimization Research

As a kind of offensive and defensive weapon,rocket artillery has always been highly valued by various countries.The sighting device,one of the most important parts of the rocket artillery,which mainly composed of a elevating mechanism gearbox and a traversing mechanism gearbox,will directly affect the accuracy and stability of rocket artillery when attacking targets.Excessive vibration will cause the sighting device to malfunction,and its excessive noise will cause the operator to suffer hearing loss.Therefore,the vibration and noise analysis and optimization of the elevating mechanism gearboxes and traversing mechanism gearboxes are of great significance for improving the performance of rocket artillery.Direction of this paper is aimed at a certain type of rocket artillery traversing mechanism gearbox,by establishing the traversing mechanism gearbox of the finite element model,the dynamic model and the acoustic boundary element model to analyze the vibration noise characteristics,and find out the running process of gearbox vibration source and noise source.Corresponding improving measures are used to reduce the vibration of the traversing mechanism gearbox and the radiated noise of gearbox.The paper mainly carries out the following aspects:Firstly,the dynamic analysis of traversing mechanism gearbox is carried out.The dynamic model of the traversing mechanism gearbox is established by ADAMS and its simulation analysis is carried out.The meshing force of gear and the supporting reaction force of bearing received during the transmission process are obtained.By comparing and analyzing the gear meshing frequency with the peak frequency point of the frequency domain results of each parameter,the results show that they basically coincide,and the accuracy of the simulation is verified.Secondly,the vibration characteristics of the traversing mechanism gearbox are analyzed.The finite element model is established by ANSYS Workbench and its modal analysis is carried out to obtain its natural frequency and natural vibration mode to verify whether the traversing mechanism gearbox will resonate.On the basis of modal analysis,the harmonic response analysis of the finite element model is carried out,and the vibration velocity curve and vibration acceleration curve of each measuring point are calculated.The vibration intensity formula and the acceleration structure noise equation are used to convert the calculation results of the harmonic response analysis into vibration intensity and acceleration structure noise.Then,the paper analyzes the radiation noise characteristics of the traversing mechanism gearbox.Establish the acoustic boundary element model of the traversing mechanism gearbox by using LMS Virtual.Lab to calculate the surface acoustic pressure,radiated noise and acoustic panel contribution of the traversing mechanism gearbox.The results show that the surface sound pressure and radiation noise of the traversing mechanism gearbox reach a maximum near the gear meshing frequency of three times.Finally,the structure of the traversing mechanism gearbox is optimized according to the vibration simulation results and the radiation noise simulation results.And the vibration and noise analysis of the optimized steering gear box is carried out.By comparing the optimized vibration and noise data with the original structure,the results show that the proposed optimization scheme has obvious effect on the vibration and noise reduction of the traversing mechanism gearbox.