Finite Element Analysis And Optimization Of Crane Boom Structure

The telescopic arm is a bi-directional bending member,and its overall stiffness,strength and stability are related to its performance,and local stability must be considered.Because the cross-sectional shape is more complicated,it requires more precise and complicated manufacturing processes,and has a longer processing cycle,which is the main reason why the crane adopts such a cross-sectional shape.Therefore,in this paper,based on the finite element analysis method,the finite element analysis model is established for the strength and stiffness of the telescopic boom of the truck crane.The load and constraints are applied to simulate and analyze the strength and stiffness of the telescopic boom structure.The verification was carried out to analyze the problems of structural strength and stiffness,and the telescopic arm section was optimized.Firstly,the main technical parameters of the truck crane are analyzed,the types of working conditions are analyzed and determined,and the load and load factor of the telescopic arm under each working condition are calculated.On this basis,the cross-sectional shape and size of the telescopic arm of the truck crane are also calculated.The design includes the analysis of the force of the variator plane and the plane of revolution,and the selection of the section of the telescopic arm.In addition,the strength and stiffness of the telescopic arm are further checked,and the stress of the dangerous section is analyzed.The results of the check indicate that this paper the strength and stiffness of the telescopic arm studied were in accordance with the standard.Secondly,combined with the working environment of the truck crane,analyze its typical working conditions,establish the geometric model of its telescopic arm,perform mesh division,apply load and constraints,and then analyze the strength and stiffness of the telescopic arm under various working conditions.The results show that: 1)the maximum stress occurs at the joint of the basic arm and the variable amplit ude cylinder,and the stress in the vicinity is relatively concentrated.In the design process,attention should be paid to the reinforcement measures,such as increasing in the stress concentration area.Pad,or use the luffing cylinder hinge shaft as the reinforcement mechanism;2)This design uses the HQ80 plate,its yield allowable stress = 800MPa> 699.19 MPa,plus the analysis of the use model is simplified,no strengthening measures are taken.From this,it can be seen that the telescopic arm design meets the requirements.The static test of the telescopic arm is carried out to obtain the most dangerous two working conditions of the SQ200ZB4 truck-mounted crane boom,that is,the working condition 1(the telescopic arm is fully extended)and the working condition 2(the telescopic arm extends 3 knots)for stress and strain.In the test,the stress value was measured by strain electric measurement method through DH3 819 A static resistance strain gauge.The results show that the error between the calculate d value of the finite element and the measured value is still kept within 15%.It can be seen that the finite analysis result is Reasonable and reliable.Finally,the shape optimization of the section of the telescopic arm,including the determination of the design variables,the determination of the state variables,the determination of the objective function,and the optimization of the telescopic arm section,the results show that the total mass of the telescopic arm before optimization is 7.8t,after optimization The mass is 7.06 t and the weight loss is 9.6.%.The optimized structural performance meets the design and application requirements,and can fully utilize the material properties,save materials,reduce costs,and the center of gravity is closer to the center,improving stability.