Research On Static And Dynamic Analysis For The Boom Structure Of Crawler Crane

Crawler crane is a floating equipment which can lift material,transportation and installment and so on,which is the most important crane of equipment which can load and unload,As China vigorously strengthen the pace of infrastructure construction and play an increasingly important role,whose safety has also been payed more and more attention.In recently years,the design of crawer cranes will largely refer to static strength as a mainly design criterion. At present,the design of the crane structure, the method is often considered to utilize dynamic load factor at work for dynamic load effects, we will enhance the static load times as an equivalent dynamic load,in the process of calculation, all the same we use static calculation method, in fact, that is a static design approach.With modern industry and technology development, the structure of the lifting and transport machinery increasingly large, mechanical load and running speed continuously improve, the dynamic load of the mechanical vibration continuous increases. Harmful vibration of the machinery will be reduced work performance and product quality. Excessive dynamic load will cause mechanical structure to damage. In the process of crawler crane operate, the frequent change in different work condition, that cause many unstable condition, mainly including load off lifting,or load lifting when load exist on the air. Either of them will come into being adjunctive dynamic load in the process of lifting load brake, startup decrease load, or load decrease during braking suddenly unload,or walking impact of the collision. In these work condition, crane structure and institution are subjected to different grades of shock and vibration effect, the shock and vibration which cause the dynamic load are primary load in the design of the crane, fatigue calculation also greatly affecte.The assumption and simplify of the complex structure are too much, which lead to poor accuracy of the results. On the one hand the strength of part of the whole structure or component is surplus, the other major structural incidents often happen such as structure ruptures ,or boom broke and so on, so this is a relatively conservative approach,and have already mature.However,with dynamic finite element calculation method just now begin,and static and dynamic characteristics of the safety of the cranes have an important impact.Not only because of mechanical load to bear, bear from the shock and vibration of the system dynamic load. Steel vibration by long-term and shock in the metal structure fatigue damage at the same time, also to staff vibration caused negative effects. Therefore, the dynamic characteristics of cranes research has become the focus of research in the field of design.Boom is the mainly bearing load structure for crawler cranes ,which also is the relatively weak tache for the structural strength .The static and dynamic loading characteristics of boom have an important impact for the safety of cranes. The fatigue destruction of metal structure will appear if it's infuenced in the vibration for a long time. At the same time, the vibration of system is disadvantageous to the operator if the parameters aren't reasonable. Therefore, investigation of dynamic characteristic on the structure of crawler crane has attach importance to the study in the design domain.The Paper takes the theory into practice to resolve practical project project which come from the boom of QUY220 crawler crane owned by XCMG. It thoroughly investigates the urgent problem of static and dynamic characteristics in the design and analysis of bridge crane by computer aided Finite Element Analysis software named ANSYS. The analysis result provides some guiding and reference result.The paper main work is as follows:Firstly, the finite element analysis model was established by ANSYS 11.0 on the basis of design drawing and practical bearing load theory of crawler crane, and assistant utilized Algor,Hypermesh to establish the finite element model and gridding meshed,and appropriate predigested based on bearing load.Secondly, through the static analysis on the structure of crawer crane by the finite element software of ANSYS11.0,and selected five typicalworking condition to analyze the linear static part,and distilled static deformation graphics and von stress distributing graphics,and based on《Crawer Design criterion》GB3811 -83 To check against static deformation and intensity.Thirdly, field test.using DH3817 static and dynamic strain instrument and resistance strain tablets,test its partly point strain when operating.proof model correctnessFoury,utilized FEA software the Release 11.0 of ANSYS to analyze the modalcondition of the main boom structure,and via expand modal , adopted to Block Lanczos arithmetic,and picked-up the preceding 10 modal results to analyze,and detail in analyzed the effect for the boom structure from the relatively larger energy.We finished the issue for half a year, this paper mainly provided a linear analytic method for boom of the QUY220 crawler crane and modal analysis of boom structure .which also afforded the theoretic gist for the optimized design and improved the capability of the crane and safety coefficient.