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Stability Analysis And Vibration Study Of Nuclear High Altitude Working Platform

Posted on:2022-09-04Degree:MasterType:Thesis
Country:ChinaCandidate:C L XieFull Text:PDF
GTID:2492306344989449Subject:engineering
Abstract/Summary:PDF Full Text Request
In the decommissioning process of a nuclear engineering facility in China,a large number of pipelines need to be removed.The conventional removal method makes the operators exposed to radiation environment,which has certain safety risks,high labor intensity and low work efficiency.In order to solve this problem,this project developed a high altitude working platform suitable for decommissioning environment of nuclear facilities,which can carry a variety of cutting equipment to realize automatic walking,lifting and pipeline removal.In order to ensure the safe,reliable and effective operation of the nuclear aerial platform,this paper analyzes the overturning resistance and buckling stability of the platform through the combination of theoretical analysis and test,studies the vibration response characteristics of the platform during cutting and walking,checks the stability of the platform from multiple angles,and puts forward the appropriate vibration reduction methods.The main contents of this paper are as follows:1)The moment balance method is used to establish the mathematical model of the whole aerial work platform,and the overturning resistance of the whole machine under dangerous working conditions is calculated;the finite element model of the fork mechanism of the aerial work platform is established by using the finite element analysis software,and the buckling analysis of the fork mechanism is carried out to ensure the buckling stability of the structure.2)The mechanical model of the aerial work platform in multiple vibration mode directions is established and compared with the simulation results.After considering the coupling effect,the numerical calculation results are modified.By adjusting the length,width and area of the cross section of the scissor arm,the sixth order natural frequency of the platform is reduced,and the seventh order natural frequency is increased,so as to realize the vibration reduction optimization.3)The acceleration response signal of cutting platform is collected.The vibration characteristics of cutting operation are obtained by analyzing the time domain and frequency domain of the collected signals.The differential equation of transverse vibration of cutting plate is established to study the mechanism of vibration of cutting platform,the causes and effects of signal characteristics in cutting fault are analyzed,and appropriate vibration reduction strategies are proposed.4)Considering the coupling effect of vehicle and road,the 8-DOF model of aerial platform is established,and compared with the walking test results of aerial platform,the walking vibration characteristics of aerial platform at different lifting heights are deduced,and the walking mode of aerial platform suitable for removing the chassis walking restriction is obtained.
Keywords/Search Tags:Aerial work platform, Stability, Vibration characteristics, Finite element analysis, Vibration reduction
PDF Full Text Request
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