P08203: DC Motor Dynamometer

Establish Target Specifications

Table of Contents

Step 1. Prepare the List of Metrics

The table below presents the metrics, or engineering specifications, that will be used by the team to design against.

List of Metrics
Metric No. Metric Importance Units
1 Weight lbs
2 Volume ft^3
3 Motor change over time min
4 Resistence to vibration yes/no
5 Operating noise level dB
6 Ease of use % acceptance
7 Accuracy Percentage
8 Power requirement W

The metrics, or engineering specifications, that you created in the preceding list should be directly related to the customer needs. In other words, if you have created an engineering specification, it should have some relationship to a need imposed by the customer or the marketplace. Use the table below to map your customer needs against the metrics (or engineering specifications). In many design and product development circles, the rows along the left is often referred to as the voice of the customer, while the columns across the top are often referred to as the voice of the engineer.

Customer Needs as Related to Engineering Metrics Matrix
Needs and Metrics Weight Volume Resistence to vibration Operating noise level Ease of use Accuracy Power requirement
Scalable x x x
Can be reproduced x
User servicable x x x
Simple software interface x
Easy to set up and tear down x x x
No hearing protection is needed x
Provides sufficient power x
Takes into account safety of user as well as the facility x x x
Follows all RIT policies and regulations x x x x x
Follows all federal, state, and local laws/regulations x x x x x
OSHA compliant x x x x x
Must have a safety kill switch x
Must fit through a standard door and be cart portable x x
Can be easily moved by two people (OSHA) x x x
Must provide curve characterization capabilities x x
Must allow for data transmission x x
Must be capable of collecting data values of a typical dyno (torque, RPM, Load, Power,etc) x x
Isolated inputs for individual electrical dyno components in order to prevent possible damage to these components during operation. x x
Automatic system shut down if any of the data values exceeds damaging limits or specified safety limits. x x
Easy to disassemble x x x

Step 2. Collect 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
Previous design - research and identify key attributes of the previous design to determine what can be used and what can be improved upon.
Benchmark 2
Motor dynamometer used in CIMS
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. See the example Table 5-6 on Page 80 of the text by Ulrich and Eppinger.

Competitive Benchmarking Matrix
Metric No. Need Nos. Metric Importance Units Benchmark 1 Value Benchmark 2 Value Benchmark 3 Value
1 Need 1,3
2 Need 2,6
3 Need 1,3
4 Need 1,3
5 Need 4
6 Need 5

Step 3. Set 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.

List of Metrics
Metric No. Need Nos. Metric Importance Units Marginal value Ideal Value
1 Need 1,2
2 Need 2,4
3 Need 5
4 Need 6
5 Need 5,1
6 Need 6,2

Step 4. Reflect on the Results and the Process


Mission Statement

Staffing Requirements

Intellectual Property Considerations

Preliminary Work Breakdown Structure

Team Values and Norms

Grading and Assessment Scheme

Required Resources


Concept Development

Identify Customer Needs

Establish Target Specifications

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