Finite Element Analysis And Optimization Of Boom System For Truck-mounted Concrete Pump

In recent years,with the national The Belt and Road Initiative is being implemented,large infrastructure construction is carried out at home and abroad,engineering machinery market has become increasingly prosperous,concrete pump market demand is growing fast.Concrete pump truck is a kind of construction machinery that it can pump concrete pump to a certain height and distance.It has good advantages,like easy to transfer,high efficiency and good flexibility.As a result,concrete pumps are widely used in construction industry.At present,the truck-mounted concrete pump is becoming smarter,lighter and so on.The boom system is an important part of the truck-mounted concrete pump which realizes the main faction of the concrete pump,and it takes the duty to deliver the concrete.The boom system has a wide range of working conditions and complex force,so it is necessary to make a special study on the boom system.This paper will take the concrete pump truck boom system as the research object,establish the finite element model for finite element calculation and analysis the strength and stiffness of boom system,and then take a strain test and structural optimization for the boom system,the test will validate the accuracy of finite element method results and modify the load.After that,this paper will optimize the thickness of the boom for reducing the weight of the boom.The specific content of the work is as follows:First,make a brief introduction for the truck-mounted concrete pump truck,introduce the development status of the concrete pump truck briefly both at home and abroad,and make a prediction for the future development tendency of the concrete pump truck.This paper expounds the significance and importance of the research on concrete pump truck.Second,this paper will calculate the boom system with both linear theory and nonlinear theory.The geometric model provided by the factory will be meshed and the finite element model will be established.128 typical working conditions are selected for linear finite element calculation in a large number of working conditions,and the stress situation of the parts of the boom system is mastered preliminarily.Then the geometric nonlinear calculation is carried out for the boom under fully extended horizontal condition and reverse condition,which will study whether there is buckling phenomenon in the boom.Whether the nonlinear calculation is more accurate than the linear calculation in the horizontal operation of the boom? By comparing the results of linear calculation with nonlinear calculation,we can find out the dangerous working conditions of boom system and the areas with high stress of each component of the boom system,and grasp the stress distribution of the whole boom system in a more comprehensive way.The data basis is provided for the next step to optimize the boom structure and improve the force of the boom.After the finite element calculation of the boom system is completed,the strain test of the arm frame system will be carried out.Firstly,the strain test scheme is set up,and the horizontal working condition is selected as the test condition,and the wireless strain test system is used to test the boom system.According to the result of finite element calculation and the selection principle of measuring point,26 measuring points are selected on the third,fourth and fifth boom and connecting rod.The load distribution of each boom is calculated in the test.The strain curves of each point in the process are obtained.After getting the test data of each test point,the collating data and the calculation result are compared and analyzed.The accuracy of the finite element calculation is verified and the calculated load is modified.Finally,combined with the results of finite element calculation and strain test,part of the boom plate is selected to optimize to reduce the weight of the boom system.The plate size optimization scheme is firstly made to adjust plate thickness.Then,the static calculation is carried out by using ANSYS software to check the stress of the boom system,and to check whether the components of the boom system have excessive stress and unreasonable force.According to the actual situation of the system,we need to further modify the optimization plan.