A Study On The Theories Of Synthetic Conceptual Design For Torpedo

The study of this paper comes from the national defense research project "The Study of The Theories and Application of Torpedo Conceptual Design".In order to solve two difficulties in the present conceptual design of torpedo, this paper introduces many new ideas into the original theories, and gives a new synthetic conceptual design theory for torpedo. One of the difficulties is that we have no a index which can represent various performances of torpedo, the other is that the coupling relationships among various subsystems and disciplines are ignored in the design process. The new ideas involve the study about operational effectiveness, life circle cost, risk and research schedule, which can be used together to evaluate a design project. And multidisciplinary design optimization (MDO), a new theory about complex engineering system design, is chosen as the optimization method for such a large engineering system.The main points in this paper are as follows:(1) Based on the system effectiveness model from WSEIAC, this paper studies the corresponding factors of torpedo weapon system, and gives both its model and analysis architecture. Every effectiveness index is studied and given corresponding ways of analysis. To get a evaluating index of operational effectiveness, this paper gives two evaluation methods based on the fuzzy and gray theories. In order to deal with many stochastic factors in the operation process, a simulating schedule is also taken as a useful tool for operational effectiveness research.(2) Form the points of conceptual design, this paper gives the models of every subsystem and discipline in torpedo design, and constructs a conceptual design architecture based on the coupling relationships among various disciplines and design process. At last, the integrated design approach is also studied.(3) In the new theory of synthetic conceptual design of torpedo, this paper takes operational effectiveness as the object function in the optimization model. Models and analysis methods are given for the synthetic conceptual design of torpedo based on the operational effectiveness. In order to involve economic index in the study, this paper introduces life circle cost into the synthetic conceptual design, and gives a model of design based on the ratio of cost and effectiveness. At last, research schedule and risk are also introduced into the synthetic conceptual design, and the optimization model according to the above four indexes is studied.(4) This paper adopts MDO as the design method in the synthetic conceptual design torpedo. In order to study MDO, this paper discuss its terminologies, some commonly used approaches, the ways of implementation and some key technologies. From the engineering point, this paper gives the ways of multidisciplinary analysis, and three models for synthetic conceptual design of torpedo by using MDF, IDF and CO. To develop a software, this paper designs a software architecture, function models and classes. At last, a simple software program is given as an example.The studies in this paper can solve the problems that some subsystems have excellent performances, while a torpedo as a whole does not work perfectly, and gives a integrated evaluating index.