FEA Of The 400T Truck Crane At The Design-stage

The process of developing and designing heavy crane is very complicated, and it is composed of structure designing, hydraulic system designing, motor driven, and design of electric control system, etc. If design of structure is the only thing to consider, there are strength of structure, rigidity, stability etc, and here needs a large amount of calculation, therefore, it is the main content of this thesis to make the complicated counting process of crane designing audio-visual, efficient and reliable.The traditional calculating method in the design process of crane is based on the fundamental theory such as Structural Mechanics, Mechanics of Materials, and Elasticity Mechanics. Because this processing method is excessive to the structure simplification, it's difficult to get the accurate results, and it is unable to manifest the structure detailed partial stress condition. Due to the complicated working conditions of the crane, the parameters needed in computation are not easy to gain, and the calculating process could be very complex. The numerical calculus method is being widely used in the engineering design process as its remarkable accuracy and highly efficiency. With the appearance of some outstanding general finite element computation software, the processes of structural design are becoming more and more intuitive, and the design cycle will be greatly shortened. However, the applications of the finite element method in the design process of crane are just in the first primary stage, further more research works should be done such as the solution of annexation between arm supports, how to deal with the dynamic response of the crane which was undergoing impulsive load and so on.ANSYS is an outstanding platform for Finite Element Analysis as its powerful solver. The finite element analysis and post-processing of the physical model could be worked out easily with the so called APDL (ANSYS Parameter Design Language). The APDL is also a excellent cattier for the sequencing and automation of calculating projects in the design process of crane. Special software for crane design process is developed by using of the APDL. The advantages of the traditional crane calculating method are recruited in this special software.Main Research Works from this Dissertation:A further research on the structure calculation program was done in this dissertation. And the development process of the special software on structure calculation program was also introduced.Both of the structures of the truck crane and their development status were introduced in chapter 1 st. The trends of the design technology were introduces with requirements of truck crane manufacturer. A new solver for the structure calculation program was carried out which based on the comparison between traditional calculating and finite element methodThe main structures and working principle of the Crane-QAY400 were introduced by details in chapter 2, as well as main mechanisms. In order to choose the best simplification for the structures, further analysis on the main mechanisms were done.In the third chapter, it introduced the simplifying method of structure as well as the finite element model building method and process of crane's major component. Feasible analogy method is also settled through the massive experiments and the theoretical analysis to guarantees the computed result is accurate. Reliable finite element model is provided through these concrete works for the following computational process.In chapter four, it firstly introduced the goal of the computation as well as its influential role at the design stage of crane. And secondly make it clear that what are the processes and theories of the computation, which provide the reliable rationale and the implementation plan for the following exploitation of the automatic computation plate for the design of crane. Then we get some results by using the computation plate and examine them to inspect the rationality of the design proposal and put forward the revision proposal in the insufficient design stage.In chapter five, we can find it exactly that whether the results gotten by the computation plate are correct or not through the test of real crane, and it can strongly demonstrate the plate's availability by specific data.The sixth chapter is summary to this article, expounding the merits of the computation plate and the aspects that need to be improved, as also as the future work which would be carry on.The mechanics computation of crane's structural in its design stage is very important to set the crane's final structure type. Furthermore, the computation occupies a long time in crane's design cycle, how to save the computing time and reduces the designing cycle of a new product is an important work. This article fully uses the advantage of the traditional computation method and the Finite Element method to develop a computation plate for the design of the crane, which provides a practical and reliable method for crane's calculation during the design stage.