Đối với vấn đề không bị giới hạn, một thuật toán hội tụ phải làm giảm chức năng chi phí tại mỗi lần lặp cho đến khi một điểm tối thiểu đạt. Điều quan trọng là cần lưu ý rằng các thuật toán hội tụ về một điểm tối thiểu địa phương duy nhất, như trái ngược với tối thiểu toàn cầu, | In this chapter we describe the interactive design optimization process. The role of designer interaction and algorithms for interaction are described especially for advanced users who would prefer to interact with the optimization process. Desired interactive capabilities and decision-making facilities are discussed and simple examples are used to demonstrate their use in the design process. These discussions essentially lay out the specifications for an interactive design optimization software. Role of Interaction in Design Optimization What Is Interactive Design Optimization In Chapter 1 we described the engineering design process. The differences between the conventional and the optimum design process were explained. The optimum design process requires sophisticated computational algorithms. However most algorithms have some uncertainties in their computational steps. Therefore it is sometimes prudent to interactively monitor their progress and guide the optimum design process. Interactive design optimization algorithms are based on utilizing the designer s input during the iterative process. They are in some sense open-ended algorithms in which the designer can specify what needs to be done depending on the current design conditions. They must be implemented into interactive software that can be interrupted during the iterative process and that can report the status of the design to the user. Relevant data and conditions must be displayed at the designer s command at a graphics workstation. Various options should be available to the designer to facilitate decision making and change design data. It should be possible to restart or terminate the process. With such facilities designers have complete control over the design optimization process. They can guide it to obtain better designs and ultimately the best design. It is clear that for interactive design optimization proper algorithms must be implemented into highly flexible and user-friendly .
