Study On The Structure Design And Dynamic Performance Of The Aerial Vehicle Operating Arm

As the rapid development of China’s economic level,more and more high-rise construction work and high altitude municipal construction needs the help of aerial vehicle.With the expansion of the use of aerial work and the increase of the use quantity,people pay more and more attention to the safety and stability in its use,so it is necessary to study the performance of the aerial vehicle operating arm.First of all,in this thesis,the operating arm of a 25-metre aerial work vehicle developed by the school-Enterprise is the theoretical designed and calculation verification of the structure of the vehicle according to the performance parameters and the corresponding national standards,and as a follow-up study.Secondly,the design results are modeled in three dimensions,the finite element model is established in ANSYS,the mechanical properties are analyzed under two dangerous conditions: the maximum working height and the maximum working amplitude of the aerial vehicle,the stress and strain of the working arm in these two dangerous conditions are calculated,and the calculation results show that the strength satisfies the requirement,The displacement deformation of the whole jib is too large,and after the overlapping part of the boom is lengthened,the displacement deformation returns to the allowable value,and the operating arm satisfies the static strength and stiffness requirements.Then the structure dynamic free modal analysis of the operating arm in these two hazardous conditions is carried out,the first six-order vibration shape is obtained,and the corresponding suggestions are given according to the properties of the vibration source.Finally,the operation arm is optimized to reduce the total mass by 95.331 kg and the range is 6.92% under the condition of guaranteeing rigidity and strength.Then the virtual prototyping model is constructed according to the motion relation in ADAMS.Taking the position parameter of the three hinge points as the independent variable,taking the minimum stress peak of the hydraulic cylinder and the force of the hydraulic cylinder as the research target,the dynamic study is carried out in the process of the initial position of the operating arm rising to the maximum working height,and the position of the three hinge points is adjusted The peak strength of the hydraulic cylinder is reduced by 19.3%,the stress stability is increased by 33.7%,and the optimal arrangement size of the hydraulic cylinder lugs on the operating arm is determined.Finally,on the premise of the completed research,the contact law between the telescopic arm and the slider is studied,and the influence of the position arrangement and the structure size of the slide block on the telescopic arm and the slide block,the position arrangement and the structure size of the slide block on the displacement of the telescopic arm are studied.The conclusion is as follows: the contact stiffness and the setting of contact area have great influence on the accuracy of the contact calculation.The slide block position far away from the basic arm’s head causes the telescopic arm’s force to reduce,simultaneously also causes the slider the stress to reduce,to the telescopic arm displacement influence is not linear,the displacement appears first reduces after increases the tendency The size of the slide block has little influence on the force of the telescopic arm,and the force of the slider decreases significantly with the increase of the size,and the increase of the size of the slide block improves the overall displacement of the telescopic arm.In this thesis,the results obtained from the research work of the aerial vehicle operating arm provide a reference for the structure design of the operating arm,the position arrangement of hinge point and the design layout of the sliding block.