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From the Library of Wow! eBook using barcode integrated for none control to generate, create none image in none applications. Visual Studio 2005 12 . Axiomatic Design Design Parameters (DPs) System Functional Requirements (FRs) FRA FRB FRC X DP1 X X DP2 DP1 is required to satisfy both FRA and FRC. The FRs are not independent. Design Parameters (DPs) System Functional Requirements (FRs) FRA FRB FRC X DP1 X X X DP2 DP3 The addition of another DP enables FRC to be re ned without affecting FRA. Design Parameters (DPs) System Functional Requirements (FRs) FRA FRB FRC DP1 X X X X DP2 DP3 DP4 FRC is controlled by both DP3 and DP4. The design is redundant. System Decomposition Each high-level req uirement is the source of requirements allocated to lower levels in the design hierarchy. Through linked matrices, the allocation of requirements drives the ability of one or more subsystems to perform as necessary in order for the full system design to satisfy its requirements. These decomposed requirements contribute to the selection criteria used to choose the best design concept for each level in the system hierarchy.

By mapping requirements to solutions,. From the Library of Wow! eBook System Decomposition teams may identify none none the need to change the allocation of requirements in order to make the full system performance more achievable. That would reduce product risks. As illustrated in Figure 12.

2, the decomposition process zigzags between the functional and physical domains and up and down in the design s hierarchy. For each FR, development teams evaluate alternative design parameters and select the best solution concept. Each selection of a concept has the consequence of generating a new level of derived requirements.

For example, consider an illumination system that must have on and off modes. Electrical lighting and ame lighting are considered as alternative design concepts for a camp lantern. Suppose that the ame lighting concept is selected.

This decision, in turn, creates a functional requirement for the source of the ame, as well as requirements for a way to ignite the ame and later to extinguish it. These are derived requirements. By analogy, the selection of a DP can generate a new constraint.

In the illumination example, the ame concept may create a constraint for minimum distance from ammable materials, a derived constraint. Development teams should analyze the consequences of their FR-DP decisions at each level in the decomposition to identify unintended con icts and dependencies. There may be better choices that can be made early, before committing to the development of the physical embodiment of the concepts.

Set Expectations for the Decomposition Process Axiomatic design quality insists on a thorough analysis of needs, constraints, and high-level functional requirements. Consequently, development teams should expect to stay high in the design hierarchy until this prerequisite work is nished. Often teams are anxious to create parts, material batches, and code.

However, because this work takes place early in the development stage, it is critical that alternative design concepts not be constrained and that teams have the most freedom to select the best available concepts. Theorem 17 (Importance of High-Level Decisions): The quality of designs depends on the selection of FRs and the mapping from domain to domain. Wrong decisions made at the highest levels of design hierarchy cannot be recti ed through the lower-level design decisions.

Often design teams can be frustrated with this early exploratory work. They may have a technology push view of their work, believing that they already know what their customers need. They may have been working on an innovative design concept and feel that the new product is the best opportunity to commercialize their work.

They may not feel the need or have the time to seek feedback from customers with conceptual prototypes. What is missed Often it can be small elements of the system design that cause the lost development time, cost overruns, and missed requirements, along with the emotional stresses that often plague projects. So development teams should understand the purpose of the process and be tolerant of the early decomposition work.

It is critical to consider and analyze the underlying framework of the requirements and constraints as well as the conceptual design solutions that they propose to meet those requirements. Delays in market entry can be extremely costly in lost revenues and extended development efforts. So thorough analysis and planning prior to deliberate design should be expected as being efficient, to avoid mistakes that can be difficult to correct later.

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