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Combined Size and Shape Optimization of Structures with DOE,RSM and GA 被引量:1
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作者 Jie Song Hongliang Hua +2 位作者 Zhenqiang Liao Tao Wang Ming Qiu 《Journal of Beijing Institute of Technology》 EI CAS 2018年第2期267-275,共9页
In this paper,size and shape optimization problem of a machine gun system is addressed with an efficient hybrid method,in which a novel and flexible mesh morphing technique is employed to achieve fast parameterization... In this paper,size and shape optimization problem of a machine gun system is addressed with an efficient hybrid method,in which a novel and flexible mesh morphing technique is employed to achieve fast parameterization and modification of complexity structure without going back to CAD for reconstruction of geometric models or to finite element analysis( FEA) for remodeling. Design of experiments( DOE) and response surface method( RSM) are applied to approximate the constitutive parameters of a machine gun system based on experimental tests. Further FEA,secondary development technique and genetic algorithm( GA) are introduced to find all the optimal solutions in one go and the optimal design of the demonstrated machine gun system is obtained. Results of the rigid-flexible coupling dynamic analysis and exterior ballistics calculation validate the proposed methodology,which is relatively time-saving,reliable and has the potential to solve similar problems. 展开更多
关键词 finite element method(FEA) shape optimization mesh morphing response surface method(RSM) design of experiments(DOE) rigid-flexible coupling machine gun system
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Modal analysis of prestressed draft pad of freight wagons using finite element method 被引量:4
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作者 Sachin Sudhakar Harak Satish Chand Sharma Suraj Prakash Harsha 《Journal of Modern Transportation》 2015年第1期43-49,共7页
The present work intends to investigate dynamic behaviour of draft gear using finite element method. The longitudinal force that the draft gear absorbs usually leads to the failure of its components, especially, the l... The present work intends to investigate dynamic behaviour of draft gear using finite element method. The longitudinal force that the draft gear absorbs usually leads to the failure of its components, especially, the load bearing draft pads. Dynamic behaviour of an individual draft pad and a draft gear is determined and characterized with exciting frequen- cies and corresponding mode shapes. The effect of compressive prestress load on the dynamic behaviour of an individual draft pad is also determined as the draft pads in assembled state are under constant axial compressive force in the draft gear. The vibration characteristics of individual draft pad are compared with draft pads that are part of draft gear. The modal analysis gives us a basis for subjecting a draft pad to higher frequency loading for determining its fatigue behaviour. 展开更多
关键词 Draft gear. Draft pad. Prestress Naturalfrequency Mode shapes Finite element method
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Use of multiscale particle simulations in the design of nuclear plant decommissioning
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作者 Richard A. Williams Xiaodong Jia +1 位作者 Peter Ikin David Knight 《Particuology》 SCIE EI CAS CSCD 2011年第4期358-364,共7页
The application of a digital modelling method that can faithfully take account of three-dimensional shape and inherent physical and chemical properties of each particulate component provides an essential tool in decom... The application of a digital modelling method that can faithfully take account of three-dimensional shape and inherent physical and chemical properties of each particulate component provides an essential tool in decommissioning design. This is useful in handling of high, medium and low level radioactive waste. The processes involve making decisions on where to cut existing plant components and then how to pack these components into boxes, which are then cemented and kept for long term storage as the level of radioactive declines with time. We illustrate the utility of the method and its ability to take data at plant scale (m-scale) and then deduce behaviours at sub millimetre scale in the packed containers. A variety of modelling approaches are used as a part of this approach including cutting algorithms, geometric and dynamic (distinct element) force models, and lattice Boltzmann methods. These methods are applicable to other complex particulate systems including simulation of waste, building recycling, heap leaching and related minerals processes. The paper introduces the basic concepts of this multi-scale and multi-model approach. 展开更多
关键词 Cementation Digital packing Digipac Discrete element modelling Nuclear waste NuPlant Particle shape
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