Establish Target Specifications
Table of Contents
List of Metrics
The table below presents initial metrics, or engineering specifications, that will be used by the team to design against.
|#||Metric||Units||Importance (Stars)||Potential Value|
|1||Production Cost||U.S. $||4||~$400|
|2||Usable Temperature Range||Degrees (F or C)||5||-10 - 100 F (-25 - 40 C)|
|7||Distribution of Light||(delta Lux)/(delta m)||3||~0|
|8||Functional Height for Distribution||Meters||2||~6|
|9||Intensity of Light||Lux||4|
|10||CRI Level||No Units||1||85|
|11||Lens Hardness (Resists Scratching)||Mohs||2||6+|
|17||Weight of Light (Mass)||Lbs (Kg)||3||~10|
The metrics above were created at the end of Design Project Management. The values listed are preliminary values and may be changed slightly as Senior Design begins and more specific values are determined. Metrics may also need to be added to satisfy other customer requirements.
Finally it should be explained what distribution of light entails. This metric will deal with the evenness of the lighting. Where the unit being used is the rate of change of the intensity of the light as one progresses further away from the source. Ideally this value should be as close to zero as possible - implying prefect distribution of the light. Clearly this is not a truly possible goal, but it is the direction that we need to head in.
Matrix in Excel File - Excel file: List of metrics
Customer Needs and Engineering Metrics Matrix
The table below correlates the customer needs with the engineering metrics specified above. This table illustrates how each specific need is satisfied by an engineering metric. Further work on this correlation should be completed as Senior Design progresses.
Matrix in Excel File - Excel file of the Needs-Metrics Matrix
Competitive Benchmarking Information
Relatively few Sr. design projects start from a clean sheet of paper. In most cases, there are some baseline solutions or products that could meet the vast majority of the customer's needs.
Write one or two paragraphs about each benchmark solution from the market place. Include a picture of the product, preferably illustrating the product in use or operation.
- Benchmark 1
- Describe the first benchmark solution here.
- Benchmark 2
- Describe the second benchmark solution here.
- Benchmark 3
- Describe the third benchmark solution here.
Use this table below to compare how pre-existing solutions should compare against the design team's efforts.
|Metric No.||Need Nos.||Metric||Importance||Units||LED hand held light||Flash light||LED replacement bulb|
|1||1, 2, 3, 4, 5, 6, 7, 10, 11, 12, 13, 14, 16, 17||Production Cost||4||U.S. $||5||8||50|
|2||12, 14, 17||Usable Temperature Range||5||Degrees (F)||200||250||140|
|3||5, 12, 17||Water-Proof||4||Binary||F||T||F|
|4||5, 12, 17||Heat/Cold Resistant||4||Binary||T||T||T|
|5||1, 5, 12||Vandal Resistant||4||Binary||F||T||T|
|6||5, 6, 12, 14, 16||Lifetime||5||Hours||10,000||70,000||50,000|
|7||2, 7, 15||Distribution of Light||2||Diameter of spread at 14ft to achieve a minimum of 1 ft-cd (ft)||0||10||20|
|8||7, 10, 15||Functional Height for Distribution||3||ft||3||100||50|
|9||2, 7, 10, 15||Intensity of Light at 14ft||4||ft-cd||0.2||10||14|
|10||6, 7, 10, 15||CRI Level||1||No units||75||70||75|
|11||5, 12||Lens Hardness (Resists Scratching)||2||Mohs||1||1||6|
|12||6, 7, 12, 14||Energy Efficiency||5||Lumens/Watt||35||45||45|
|13||2, 12, 13, 14||Recyclable Parts||1||Binary||T||T||T|
|14||2, 3, 4, 12||Environmentally Friendly||2||Binary||F||T||T|
|15||11, 12||Aesthetically Pleasing||4||Binary||T||T||T|
|16||7, 8, 9, 12, 14||Standardized||4||Binary||T||T||T|
|17||5, 9, 12 ,13||Weight of Light||3||Lbs (Kg)||1||2||1.5|
Ideal and Marginally Acceptable Target Values
Given the customer needs, awareness of the marketplace, and resource limitations of the current project, assign preliminary engineering specifications on each of the metrics. In addition to setting the nominal or target value or each specification, provide guidance to the team on the ideal value or direction that the team should strive for, once the nominal target values have been realized.
|Metric No.||Need Nos.||Metric||Importance||Units||Marginal Value||Ideal Value|
|1||1, 2, 3, 4, 5, 6, 7, 10, 11, 12, 13, 14, 16, 17||Production Cost||4||U.S. $|
|2||12, 14, 17||Usable Temperature Range||5||Degrees (F or C)|
|3||5, 12, 17||Water-Proof||4||Binary|
|4||5, 12, 17||Heat/Cold Resistant||4||Binary|
|5||1, 5, 12||Vandal Resistant||4||Binary|
|6||5, 6, 12, 14, 16||Lifetime||5||Hours|
|7||2, 7, 15||Distribution of Light||3||(delta Lux)/(delta m)|
|8||7, 10, 15||Functional Height for Distribution||2||Meter|
|9||2, 7, 10, 15||Intensity of Light||4||Lux|
|10||6, 7, 10, 15||CRI Level||1||No units|
|11||5, 12||Lens Hardness (Resists Scratching)||2||Mohs|
|12||6, 7, 12, 14||Energy Efficiency||5||Lumens/Watt|
|13||2, 12, 13, 14||Recyclable Parts||1||Binary|
|14||2, 3, 4, 12||Environmentally Friendly||2||Binary|
|15||11, 12||Aesthetically Pleasing||4||Binary|
|16||7, 8, 9, 12, 14||Standardized||4||Binary|
|17||5, 9, 12 ,13||Weight of Light||3||Lbs (Kg)|
Reflect on the Results and the Process
At this stage of the project preparation, all of the target specifications are estimates. The really meaningful target specifications will arise when the benchmarking sessions are carried out at the beginning of Senior Design I. These sessions will allow the team to get an idea of what is needed to complete the project fully. Then the most accurate target specs can be determined.