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Title: Development of robust simulation, design and optimization techniques for engineering applications
Author: Bates, S. J.
Awarding Body: University of Wales Swansea
Current Institution: Swansea University
Date of Award: 2004
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The first problem is concerned with slit die design, specifically the shape optimization of a choker bar flow restricting mechanism. Two approaches have been used in solving the problem. The first is deterministic optimization assuming ideal conditions, where the performance of three optimization methods, one gradient-free, one gradient based and one hybrid method, are compared. The second is (stochastic) robust design optimization (RDO) where uncertainty in real conditions is accounted for; in this case the deterministic solution is also a robust design. In developing the RDO procedure two new methods were devised. The first is a multi-objective optimization method, it is more efficient than existing methods. The second is a general method for generating the optimal Latin Hypercube space-filling design of experiments using a permutation genetic algorithm. The second problem is concerned with the design of an A-pillar for a convertible sports car. A variety of CAE tools are brought together into a single design process. An initial feasible design is generated without the need for prior physical prototyping and testing. The process used to develop the final solution involves topology optimization, shape optimization, response surface approximation, manufacturing simulation and structural simulation. Thirdly, a general procedure for the development of a CAE system for designing seats for comfort is presented. The system can be applied to the design of seats. It combines robust design and topology optimization. A review of the mechanisms that cause discomfort and some current CAE methods to improve comfort is given. Finally, an FE-based computer simulation of a cargo during sea transportation is developed to predict the behaviour of the complex multi-body system subjected to a time-dependent, multi-axial loading is described. Load curves to represent the motion of the sea and for simulating the assembly sequences are developed. Using the model, the interactions and the load path sequences for several different loading regimes are identified. They show that there are some major deficiencies in the original design.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available