Minggu, 08 Januari 2012

What is a Preliminary Design Stage Definition?

Where the Preliminary Design Phase?
Preliminary design stage may also be known as conceptual design or architectural design. During this phase, the high level design concept is created, which will implement the requirements of complex electronics. The design concept can be expressed as a functional block diagram description, design and architecture, sketches, and / or behavioral HDL (hardware description language).

The focus of the preliminary design is to determine the approximate dimensions, weight, force, load limits and other physical characteristics to the optimal plane, it is best to maximize value for the competition. The main areas of concern are the wing area, span and size of the empennage. Routines are modeled based on the conceptual design; carefully consider the specific needs of competition.

The purpose of the design phase (early and detailed) is to create a design that would really and truly implement the requirements. For the preliminary design stage, the main purpose is to map out how the complex electronics will perform the functions specified in the requirements, within the limits of the device, the interface is defined, and the device will operate in the environment. At this stage, the designer must maintain perspective and see the operating system of complex electronics in concert with the entire system. Now is the time to identify inconsistencies, misunderstandings, and ambiguities.

Design assurance objectives are to verify that the design has to implement all the requirements, and that it implements nothing but the requirement. Any deviations (such as additional functions which may indicate missed requirements) are reintroduced into the process engineering requirements.

The main design activities for the preliminary design phase are:

- Create high-level design descriptions.
- Identify the major components, including third-party modules or IP cores.
- Any derived requirements resulting from this process is fed back into the requirements engineering process
- Any omissions or errors are resolved
- Include reliability, maintenance, and test the features necessary to meet the performance requirements and quality, and to ensure that testing can be performed to verify the requirements.
- Identify constraints on other system elements that are the result of high-level design.

This assurance process for complex electronics assumes that the requirements of complex electronics have been developed assessed, and baseline (formalized). In fact, these requirements can be included in the specification of higher-level assembly requirements, such as circuit boards or sub-system. Requirements for complex electronics will likely be a work in progress, as the design decisions in other areas of the system influences the function CE devices will appear. Management requirements will be an important process throughout the design, implementation, and testing phases.

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