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Structural Topology Optimization for Hydraulic Press Lower Beam Based on the ESO & Research on the BESO

Author: SunShengQuan
Tutor: ZhangDaKe
School: Chongqing University
Course: Mechanical Design and Theory
Keywords: Topology optimization Evolutionary structural optimization Bi-directional evolutionary structural optimization Hydraulic machine under the crossbar Finite Element
CLC: TH122
Type: Master's thesis
Year: 2008
Downloads: 149
Quote: 4
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Abstract

The hydraulic machine is a universal forging machinery is important in the modern industrial production equipment. Hydraulic machine under the beams is an important structural components of the deformation size and other characteristics will directly or indirectly affect the quality of the processing of the workpiece. Hydraulic machine under beams complex structure, the traditional mechanics of materials design method is difficult to ensure the accuracy and reliability of the calculations; finite element method structural analysis provides a powerful means of analysis, but existing research is more limited for the structure finite element strength analysis checking and size optimization, failure of the structural topology optimization, it is difficult to achieve radically improved the original structure, and therefore can not get a true sense of the optimal design. gradual removal of the contribution to the stiffness of the structure of the material unit, with full stress-based criteria method for topology optimization design. Due to the concept of evolutionary structural optimization method is simple, easy to implement, especially easy to combine with existing finite element software, quickly got the attention of research scholars at home and abroad. The subsequent development of the bi-directional evolutionary structural optimization method to solve the problem of traditional evolutionary structural optimization method unit to delete, and then can not be restored. After ten years of development, evolutionary structural optimization method has achieved many important results, a large number of operators demonstrates the effectiveness of the algorithm. Research method is more biased towards the theoretical aspects of the theory is still constantly developing, applications have yielded few results. Bi-directional evolutionary structural optimization evolutionary process control more parameters there are, makes its practical application is subject to certain restrictions. Explore new algorithm, the new guidelines and new fields of application, is a the ESO method of research priorities and difficulties. The study of the evolution process delete and add units to determine the guidelines for a more in-depth research, in order to give full play to add a unit in the optimization process, a stress mutation rate-based bi-directional evolutionary structural optimization method and implementation guidelines. The method stress mutation rate, a parameter in the process of the adding unit only to a certain extent, to avoid the mutual restraint of the plurality of parameters, and thus high evolutionary efficiency. Example and their comparison with the results of other methods show that the method is effective and reliable; further expanding and improving the theory of traditional evolutionary structural optimization method. Method more widely used in practical engineering, the paper use based on the stress constraints evolutionary structural optimization method and topology optimization under stress mutation rate of the bi-directional evolutionary structural optimization method based on the hydraulic press beams. To study the optimal force transmission path from the structure topologies source, under the form of beams optimal structure, thus achieving a consistent optimal structure topology and shape and size optimization. Made useful exploration of the practical application of the evolutionary structural optimization method to obtain a more reasonable topology to improve the use of a hydraulic machine performance, and to improve the design of our hydraulic machine level. The results obtained with the actual engineering value, provides a new approach to the design of the hydraulic press beams or other three-dimensional structure topology optimization.

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