Working steps of CNC cutting table.

Extending product life is one of the effective ways to reduce the waste of resources. However, many unsatisfactory products are scrapped because of a lack of adequate performance. The product should be improved and upgraded innovatively, and the existing upgradable products may create more economic benefits for the longer product life cycles. This paper proposed a product innovative design and product upgrade employing an Extenics-TRIZ Integrated requirement-function-principle-structure (RFPS) model, which aims at complex requirement flexibility with easy-to-use design process when the product needs a redesign. Here, the requirement flexibility refers to the ability of a design object to adapt its design levels. There are two design strategies: the extension analysis methods are utilized to map the top-level requirements to functions, principles, and structures requirements, and then the TRIZ is used to handle the design problems according to the objects on different levels. This design knowledge is summarized as RFPS, and it can be reused in computer-aided innovation further. A case study for a cutting table is illustrated to the innovation and upgrade, and it indicates the effectiveness for designers to implement the design methodology.延长产品生命周期是降低资源浪费的有效途径之一。然而，诸多性能不达标的产品往往因性能不足被提前报废。对产品进行创新性改进与升级，可延长其生命周期，为现存可升级产品创造更多经济收益。本文提出了一种融合可拓学（Extenics）与发明问题解决理论（TRIZ）的需求-功能-原理-结构（RFPS）集成模型，用于产品创新设计与升级改造。该模型旨在应对复杂的需求柔性问题，并在产品需要重新设计时提供简便易行的设计流程。此处所指的需求柔性，即设计对象适配自身设计层级的能力。该方法包含两类设计策略：其一，通过可拓分析方法将顶层需求映射至功能、原理与结构需求；其二，依据不同层级的设计对象，利用TRIZ解决设计难题。此类设计知识可被归纳为RFPS模型框架，进而可进一步应用于计算机辅助创新设计场景。本文以切割工作台为例开展创新升级案例研究，结果表明该设计方法论可有效辅助设计师完成相关设计工作。