The Lightweight Research And Dynamic Study Of The Crane Beam Structure Of Single-beam Bridge Based On ANSYS

In the mechanical structure design and manufacture of modern society,lightweight research is the trend of all machinery and equipment, especially for large volume, heavy crane mechanical structure,so the lightweight research of the single girder bridge crane beam structure occupies very important position.Whereas in the past,there is no more accurate data as the basis to verify the crane dynamic performance accurately, the test can only execute after the product design is completed and it is a process which has long cycle and the large cost.According to the data shows, various types of crane body weight in our country compared with the foreign advanced crane, weight about more15% ~ 45%. The bridge crane beam structure as the main components of the crane and bearing structure, its weight accounts for about 60% of the machine,and the beam weight is an important indicator of quality to measure the whole machine structure, the selection of the design parameters influences the success or failure of the whole design scheme directly. If it choose aluminum alloy or new type of lightweight alloy material which with high strength, the cost is not desirable apparently.In this paper, it compared the design of the crane structure and the weight at both home and abroad and found that the safety factor selection is too large of the crane structure design in our country, so as to make the structure bridge machine heavy and material waste seriously, at the same time,the main girder have design problems and defects such as it has the large amount of rich strength and stiffness.So the beam structure lightweight research is imperative.For the above problem,this article use the 10 t- 24.8 m bridge crane beam structure as the research object, finished the transient dynamic research and lightweight research and finally the beam structure is optimized, the concrete research content are as follows:(1)Researched and analyzed drawings and the overall structure of the research object, created the CAD entity model of the bridge crane beam structure through software named Solidworks2013.(2)Did the statics,modal analysis,harmonic response analysis and transient dynamic analysis of the beam structure by using the large analysis software ANSYS Workbench.Researched and analyzed the the static and dynamic response of the beam structure during the time-load under many conditions, we can grasp the change rule of the maximal displacement and the maximum stress,the vibration velocity andacceleration of the beam structure clearly that the load variate over time through the dynamic response characteristic curve.Finally it carried out the checking calculation of strength and stiffness,using the maximum stress and deformation, dynamic stiffness,and the variable section sizes as the constraint conditions and finally established optimization mathematical structure model of the crane beam。(3)Take the car and the electric hoist lifting equipment as a whole.In the process of optimization,its impact can perform in the form of the impact factor and lifting dynamic load coefficient.Finally in the Design explorer fast optimization module of ANSYS Workbench,carried out the study of structural lightweight of he single girder bridge crane beam in this paper,selected the section variable of the beam as the input parameters, and chosen the stress, the maximum strain, dynamic stiffness and the value of minimum quality as the output parameters.Compared the strength, stiffness and dynamic analysis results and the design size parameters of the beam structure before and after the optimization,finally got a set of optimal design parameters of the beam structure and minimize the beam quality. In the end,completed the research purpose of this subject.