From the Library of Wow! eBook in .NET Maker DataMatrix in .NET From the Library of Wow! eBook

From the Library of Wow! eBook using barcode implement for vs .net control to generate, create data matrix image in vs .net applications. iOS Robustness Development Fixtures investment. As a caution, depending on the particular data, it s possible to have an increased Cpk but also an increased quality loss. That could be the situation of a distribution with a small standard deviation but a mean that s off target, close to the speci cation limit.

The quality loss would then provide more important information to drive corrective actions. We cover tolerance design in detail in 20..

Robustness Development Fixtures Usually, physical prototypes are needed to explore the unknown behaviors of a function. To be useful for experimental development, physical models should have characteristics that enable testing, analysis, and con guration changes. There are three fundamental types of test beds for product development: 1.

Breadboards at the level of subsystems or assemblies 2. System-level development xtures with various elements of subsystem integration 3. Full system design prototypes At the subsystem or assembly level, breadboards are designed to test alternative design concepts.

These can be employed during the phases of technology development as well as in the early phases of product development. The objective of this work is to identify and specify controllable parameters that are most in uential over the subsystem performance. The experimental evidence will determine whether or not the chosen design concept will be robust enough against the expected stresses when it s integrated into the larger product system, and whether or not it is better than available alternative design concepts.

These are among the acceptance criteria for the end of Phase 1. A system-level test xture can have a variety of forms. It can be an integration of the several subsystem breadboards that comprise the system, or it can be more product-like for those subsystems not subject to development.

An example of the latter con guration is an adaptation of a current full system product attached to a subsystem under development. The modi ed product can be an inexpensive way to represent elements of the future system s design, particularly in ways that impose valid inputs and stresses on the subsystem being developed. You may have heard of these adapted products being called test mules, since they support the subsystem of interest.

They are particularly applicable in Phases 1 and 2. The objective for their use is the identi cation and speci cation of critical functional parameters that both integrate the subsystems well and optimize the system-level performance and robustness. Full system engineering prototypes can also be useful for robustness development.

However, the more they represent production designs, the less exibility they have for making changes. Also, production designs may have reduced access for the detailed instrumentation required to evaluate designs. An engineering model, constructed from production-intent designs, may be useful for demonstrations of robustness.

However, the ability to make changes may be limited to its designed-in adjustments. A full system prototype designed speci cally for robustness development will be more applicable to Phase 2 of product development. In Phase 3 a production-intent prototype will be more focused on translating the functional parameters into con gurations and speci cations for manufacturing and service.

It will also be suitable for reliability growth testing. To be most useful for robustness development, a prototype or test xture should be designed speci cally to enable. From the Library of Wow! eBook 7 . Robustness Development for Product Designs Design concepts to be changed easily Key factors to be measured and adjusted easily: Input signals to the functions under development Controllable functional parameters External stresses to be imposed deliberately in controllable, measurable ways Internal stresses from subsystem interactions to be measured Output responses of the function and their variations to be measured These features are not necessarily intended to be replicated in production designs. As we mentioned earlier, certain critical functional parameters may be xed by tooling in production designs but con gured as adjustments in development xtures. The architecture for the development prototype may enable one subsystem concept to be easily replaced by an alternative concept, while in a production design the mounting would comply more with guidelines for durability under the shock and vibration of handling or for the ease of assembly and service.

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