Research On Theories And Methods Of Design For Cost(DFC) In Concurrent Engineering

On the condition of market economy and the information period of on-limits, integrative econoiiw in whole world, enterprises comprehensively use cost, quality, service, time and en~抜ronnient to compete in the market. The cost is a key influence factor in enterprise competition abilities. Adapt to the age characters,it has a great meaning to find a new method to reduced the cost and enhance the enterprise competition abilities and economic benefit. Generali), this method is very effective in the beginning of design because the cost of the product have been decided in the design phase. After the design phase, it is difficult to reduce the product cost. In this dissertation, the special emphasis has put on the theories and methods of Design For Cost(DFC). The dissertation mainly consists of seven sections:1 .We discussed concurrent engineering about its definition, targets, characters, affection, research hotspots, general application situations and key technologies. Then we discussed the relational research of DFC. For the first time we analyzed the differences and sameness between DTC(Design To Cost) and DFC. We gave a definition of DFC and its research areas.2.We put forward the concept model of DFC and its key technologies for the first time.3.We analyzed theories and methods of machine design and design process. Then we bring forward diffefent design feature classes in the different design models. The feature provided design information for estimating cost.4. On the basis of life cycle cost component and estimation analysis, we gave the cost estimation features in product life cycle(include manufacturing, assembly, sale, use, service, recycling and reject).Then we proposed the cost estimating strategies and a framework structure of cost estimating ways.5.The transformation of the design features to the cost estimation features is realized by using multiple domain feature mapping.6.Using axiom design theory and methdd, we analyzed life cycle cost estimation and decoupled the cost estimating. Then we proposed a cost estimation software frame. Using the frame the software development and the cost estimation can be executed concurrently.7.Finally,we proposed a DFC prototype system and a DFC concept model based on the group technology and feature technique for the first time.