ECE 495 - INTEGRATED SYSTEMS. Requirements Specifications and Standards Timothy Burg. Life Cycle of a Troubled Project. Project Initiation . Wild Enthusiasm. Disillusionment. Search for the Guilty. Change. Punishment of the Innocent. Promotion of the Nonparticipants .
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Requirements Specifications and Standards
Search for the Guilty
Punishment of the Innocent
Promotion of the Nonparticipants
Definition of the Requirements
Failure was attributed to conversion between metric and English measurement units between contractors
Lockheed Martin used English measurements
NASA navigation team used metric measurements
The contractor, by agreement, was supposed to convert its measurements to metricsDesign Example – Mars Orbiter Crash
A successful project will have a technical agreement between all parties (and they will monitor and enforce the agreement).
Every important detail about what is expected is written in this document.
All parties should understand the size, weight, reliability, electrical performance, etc. expected in the final product.
Harmonize the vision for the telescope through a Requirements Document
Gamma-Ray Large Area Space Telescope Telescope developed by NASA in collaboration institutions and partners in France, Germany, Italy, Japan, Sweden, and the United States.
The subsystems designed (independently) by each group must be assembled and work together to perform the function of GLAST
One important component (PIN Diode)
Used Standards to describe how routine items are done.
Thousands of pages that describe what the system should do and how well.
This all-sky view from GLAST reveals bright emission in the plane of the Milky Way (center), bright pulsars and super-massive black holes.
+/- 0.1 mA, 800 mm/sec
Mean time between failures (MTBF) = 30,000 hours
<5W normal operation and <5mW sleep mode
> 10 hours on single charge
What is the common theme? We could measure the final system to see if it met these requirements.
I can’t make a measure to determine if something is “fast” but I could measure if it moves at 800 mm/sec
Operate in -20oC to 100oC ambient conditions.
You are writing requirements for internet service, is this a good specification?
It is great if you are the seller, terrible for the buyer
What sales department
Sold to customer
What engineering designed.
How the software was written.
How it was fixed in the field during installation.
What the customer wanted
We need a common vision.
Why is this cartoon funny? Because it is so often true.
Help you leverage the wisdom and experience of many experts to describe the system to be designed.
Document that tells how to do something or how something must behave.
550 standards issuing bodies in the United States
550 standards issuing bodies in the United States (cont.)
IEEE Standard 1233, Guide for Developing System Requirements Specifications
Properties of the Requirements Specification (the set of all Engineering Requirements)
You and your colleagues.
Standards give a good point to start or at least narrow down your research
Usually standards help in describing expectations
Testing- Standards should be met for all tests conducted on product
System that turns bottles in an incubator.
Motor and controller
What is in the Marketing Requirements and the Engineering Requirements?
The customer has asked for the following, what are the Marketing Requirements?
Wheaton Science Products seeks an apparatus to enable you to easily scale-up anchorage-dependent cell lines from standard plastic flasks. Benefits of the Roller Bottles are the increased surface area, gentle agitation and improved gas exchange when cells are rotated out of the medium. All models are CE/UL/CSA marked for international use and are available with different electrical plug configurations. Economy bench models allow inexpensive entry into this technology with units rotating from one to eight bottles. For vaccine production or when high yield is needed, use the Wheaton Modular Cell Production Apparatus and add decks that will hold additional bottles, as needs increase. Backup battery systems and rotation alarms can also be added to any Wheaton Roller Production Equipment. Wheaton Roller Apparatus accommodates standard culture vessels, 108 to 121 mm in diameter and up to 550 mm long.. Rotation speed can be set by the user.
Map Marketing Requirements to Engineering Specifications
Map Marketing Requirements to Engineering Specifications
Include a similar table in your design report.
A parts manufacturer has asked your team to propose an adapter design to interface between a General Performance Master Unit (Master Unit) and a General Performance Conditioning Module (Conditioning Module). The adapter will connect to a 9V supply that is accessible on the back of the Master Unit and supply 5V to the Conditioning Module. A general sketch of the desired adapter unit is shown in Figure 1. The Master Unit output voltage may be adjusted to exactly 9V (assume perfect voltage source). The Conditioning Module requires 5V ± 5%. The Conditioning Module consumes exactly 0.1W at 5V. An indicator light should be included to show that the adapter is functioning properly. The adapter must be implemented as a voltage divider with no active components. Design a device that meets the requirements above at the lowest cost (e.g. use a 10% over a 0.1% resistor if possible).