Electrical system design is the design of electrical systems. This can be as simple as a flashlight cell connected through two wires to a light bulb or as involved as the Space Shuttle. Electrical systems are groups of electrical components connected to carry out some operation. Often the systems are combined with other systems. They might be subsystems of larger systems and have subsystems of their own. For example, a subway rapid transit electrical system is composed of the wayside electrical power supply, wayside control system, and the electrical systems of each transit car. Each transit car’s electrical system is a subsystem of the subway system. Inside of each transit car there are also subsystems, such as the car climate control system.
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Avionics and Electrical Systems
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Systems Analysis - Electrical Circuit to State Space
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Intro to Control - 6.2 Circuit State-Space Modeling
Transcription
Music full then under VO. The Marshall Space Flight Center’s experts in Avionics provide in-depth engineering for the research, design, development, fabrication and evaluation of avionics systems. “Today’s Avionics & Electrical System architectures are more flexible and affordable systems, and Marshall’s team embraces these attributes.” Flexibility is achieved using in-house design options including integrating commercial, off the shelf with custom designed hardware. Affordability is achieved across the system lifecycle by design considerations and early assessment of System Certification through “out-year” sustainment and operational use. Designing a system that economically accommodates future change is the challenge; NASA’s team has solutions to offer.Some of the Specialty services NASA has to offer include Flight Robotics Lab hardware simulations, power systems testing, Field Programmable Gate Array (FPGA) design and programming. To design, build and operate hardware for the harsh environment of space you need robust electronic design, fabrication, and packaging. To complete the process you need Electromechanical Parts Engineering, Obsolescence Management and Part Failure Analysis.Marshal also performs electrical environments testing.Numerous Avionics resources are available to perform Development, Test Evaluation and System Certification of critical systems. “We have unique capabilities to design and test robotic applications for both science and human exploration missions” Marshall’s Avionics & Electrical Systems diverse experience comes from a broad range of projects including; Instruments and Experiments Payloads… Free Flyers… Launch Vehicles… And the International Space Station. Marshall’s Avionics and Electrical Team has proven past performance. This team has gained valuable knowledge from its unique position on a broad range of developments. Combining your team’s strengths with the Marshall team’s knowledge, skills, and capabilities builds for a strong development team and will help ensure the success of your development.
Design
The following would be appropriate for the design of a moderate to large electrical system.
- A specification document is written. It probably would have been written by the customer. The specification document states in plain language and numerical detail what the customer expects. If it is well written, it will be used as a reference throughout the electrical system design.
- A functional specification (design) document that goes into more technical details may be created. It uses the specification document as its basis. Here calculations may be used or referenced to support design decisions.
- Functional diagrams may be made. These use block diagrams indicating information and electrical power flow from component to component. They are similar to the functional flow block diagrams used with computer programs.
- Schematic diagrams showing the electrical interconnections between the components are made. They may not show all the conductors and termination points. Except for one-line diagrams, this should show all the circuit nodes. One-line diagrams represent the three or four conductors of three-phase power circuits with one line.
- Wiring diagrams are sometimes made. These show and name the termination points and names of each conductor. In some systems, enough information can be put onto the schematics so that wiring diagrams are not needed.
- Physically smaller systems that are built many times may use a cable harness. A full-sized to-scale wiring diagram can be made of a cable harness. This wiring diagram can then be laid on a peg board and used to guide the construction of more cable harnesses. Harnesses can be inserted into their equipment as an assembly. Cable harnesses that are reused many times, like automobile wiring harnesses, are created with automated machinery.
- A wire list is made in spreadsheet or list format. It shows the electrical assembly people what wires are to be connected and to where. When it is printed out on paper, it is easy for the assembly people to check off conductors as they are connected. The wire list contains at a minimum each wire name, terminal name, and wire model number or gage. It may also contain the wire termination device model numbers, voltage classes, conductor class (high-voltage, medium voltage, or control wiring), etc.
References
- Bosela, Ayanda Voyi, Theodore R.(2002). Electrical Systems Design, Prentice Hall, ISBN 978-0-13-975475-3, 542 pages.
This page was last edited on 20 January 2023, at 18:11