Papers by Keyword: Optimization Design

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Authors: Li Hong Qiao, Ahmad Zia, Na Cai
Abstract: The scope of design optimization differs from one industry to another. In various situations, new part design is an instance of previously designed part i.e. it differs only in some dimension from the previous part. This can be due to change in functional parameters of the product, building part family or continual improvement in existing design etc. A hybrid approach for part geometry optimization of such parts is presented in this paper. It includes finding relationship between part geometric and functional parameters at assembly level. The designed part is simulated using finite element analysis (FEA) for validation and a set of feasible part geometry parameters along with their effect on objective function (functional parameters) are obtained through knowledge enabled design of experiments (DOE). The optimum solution is sought among them and validated through structural analysis of part / product. The process has been applied successfully in design optimization of electrode_holder in spot welding equipment for automotive industry.
Authors: Xiu Ling Han, Fu Jian Zhou, Chun Ming Xiong, Xiong Fei Liu, Xian You Yang
Abstract: A new composite reservoir simulation model of lower computation cost was used to optimize hydraulic fracture length and fracture conductivity during performing a hydraulic fracturing. The simulation model is divided into inner part and outer part. The inner part is dual-porosity and dual-permeability system, and the other is single porosity system. The research shows that the natural fracture permeability and density are the most influential parameters; a relative long fracture with high hydraulic fracture conductivity is required for a high production rate due to non-Darcy flow effects. A shorter primary fracture is better in a gas reservoir of high natural density. The composite model represents the flow characteristic more accurately and provides the optimal design of fracturing treatments to obtain an economic gas production.
Authors: Zhong Min Wang, Yu Jun Cai, D.H. Miao
Abstract: A new improved genetic algorithm (IGA) based on floating point encoding is proposed. Firstly, IGA uses information entropy to produce better initialized species population. Secondly, after synthetically studying the searching properties of crossover operator in GA, it designs a new crossover strategy that effectively increases searching efficiencies of IGA. Thirdly, to avoid searching being trapped in local minimum, it designs a chaos degenerate mutation operator that makes the searching fast converge to a global minimum. At last IGA is used to solve the problem of the optimal design to crane girder, which is a typical problem of mechanical optimal design. Compared with the traditional random direction method, neural network method, genetic-neural network method, hybrid genetic algorithm, chaos-GA, PSO algorithm, chaos-PSO algorithm and standard GA, IGA shows better performance at the aspect of solution precision and convergence speed than that of these algorithms.
Authors: Yuan Bo Cui, Min De Shen, Yu Xin Zhao
Abstract: Types of tire storage and their advantages and disadvantages were introduced, a optimization design method for the tire gravity-type AS/RS with tire rolling principle was proposed in paper.
Authors: Ki Hyun Kim, Dae Gab Gweon, Hyun Soo Jung, Soo Hun Lee, Min Sung Hong, Moon G. Lee
Abstract: Design of design of X-Y-Theta fine stage using VCM (voice coil motor) is presented in this paper. This fine stage is combined with linear DC motor. Long range, high speed and high precision of the stage is obtained by using dual servo control for laser micro/nano machining. A novel structure of VCM for the fine stage is proposed. The fine stage can have 3 DOF(X-Y-Theta) motion by four VCM actuators which are located on the same plane. The X-Y-Theta fine stage is designed to have high acceleration for high throughput. Based on the design, the stage is fabricated. The designed stage has the acceleration of 5m/s2 with 45kg total mass. In addition, this actuator is feedback controlled using HP laser interferometer. The reaction force between the coarse and fine stage of the dual servo is compensated by force compensator.
Authors: Fu Qiang Ying, Yi Wang, Ling Dong Wu, Liang Yi Li
Abstract: With the optimization design method of FE,the FE model of vertical flange lathe beam of double-tool holder was established,the sensitivity analysis of dynamic performance for the machine tool was performed based on presented modal analysis and probability analysis.The influence rules of the first four natural frequencies affected by the design parameters of the lathe beam were confirmed and the weaknesses of it were indicated as well.Then, the structure of the lathe beam was optimized.As a result ,the dynamic performances of the lathe beam are improved and it offers the basis for the optimization design of the other lathe parts.
Authors: Jen Sheng Shie, Ming Chang Shih
Abstract: This paper discusses about how to optimize design of an aerostatic bearing. In order to achieve the objective, there are four necessary qualifications: high load capacity, high stiffness, low flow rate and uniformly pressure distribution, those make an aerostatic bearing optimized. The finite difference method is employed to obtain the numerical solution of the pressure distribution between the surface of aerostatic bearing and worktable. The performance is determined by the pressure distribution of aerostatic bearing. Furthermore, this study proposed an integrated optimal approach that is HTGA/Gray. Comparing with many kinds of optimal theories finds out the most suitable parameters of an aerostatic bearing. Finally, the experimental results for the load capacities and flow rates clearly indicate that the proposed aerostatic bearing can enhance ability effectively.
Authors: Ki Sung Kim, Kyung Su Kim, Hyoung Jin Park
Abstract: Grillage is common types of structures in marine and land-based structural system. Grillage system that increases the stiffness of plate used by two rectangular stiffeners is a part of deck, side shell and bottom of ships. The worst load point of those structures is dependent on the loads, which are vertical, in-plane or combination of those directions as well as boundary conditions. The worst deflection point is produced when the point load is examined at central intersection. But the worst loading point would not necessarily be at the central point. To find the worst load point, a moving point load is applied to along the vertical and horizontal beams around mid-spans. Direct stiffness method is used as an analysis tool. Structural model tests are also carried out to confirm the theoretical analysis results. To find the optimum arrangement of grid system under a given point load, an optimization technique is applied. In this case, the minimum weight is the objective function and allowable stress, deflection and other dimension limitations are constraints.
Authors: Ching Hui Tang, Wei Chung Wang
Abstract: The airline-specific gate which is exclusively used by a specific airline has been applied in many airports. In this study, we follow the above consideration to develop a system analysis tool for gate assignment problem occurred in the airline industry. The system tool is embodied in an optimization design model resulted from an airline’s perspective. Numerical tests, based on the operations of a Taiwanese airline, are carried out to demonstrate the performance of the proposed system tool.
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