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Examples
Product Specification Version 1.0
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| Index | Titel | Value | Unit | Importance* | Source | Links to Req. Specification | Comment |
|---|---|---|---|---|---|---|---|
| AA | Weight | <1 | kg | R | Customer Mechanics | 1 | |
| AB | Power consumption | <1 | W | R | Customer Electrical | 15 | |
| AB | Power consumption | <0.5 | W | O | Customer Electrical | 25 | Customer wants to achieve a battery usage in future generations of the device |
| AC | Costs | <100 | EUR | R | Customer Purchasing | 2,3 | |
| ... |
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| Index | Titel | Value | Unit | Importance* | Source | Links to Source | Discipline | Influence by product function | Comment |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Total Weight | <1 | kg | R | Product Specification | AA | ME, EE | (this column can be filled only after functional decomposition) | |
| 2 | Bill of Material Costs | <20 | EUR | R | Product Specification | AC | ME, EE | Break-Down by target-costing team | |
| 3 | Assembly Costs | <5 | EUR | R | Product Specifications | AC | P | Break-Down by target-costing team | |
| ... |
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Areas requirements may come from
Within literature on design there are always checklists which should help to tailor the requirements and to prevent missing a specific topic or area while creating the lists. I personally like the lists of "Pahl Beitz", although they may need to be extended beyond the technical features a bit.
Areas to consider | |
|---|---|
| Geometry | How large should it be, are there any limitations or boundaries. How does the geometry change when operating. Anything to consider compared to storage and non-operational states. |
| Kinematics | How does the mechanical interface look like. How is it fixated, should the output translate/rotate, ... |
| Forces | What are the in-/ and output forces or torques generated by the device but also applied to the device |
| Energy | Power sources available, output power, radiation relevant, other "exotic" forms of energy existing (accelerations) |
| Material | Any exposure to materials (chemical, biological,...). Any limitations on material choices |
| In- and Output Signals | What kind of control signals does the device receive, what kind of output signals should it generate? |
| Safety | Passive or active safety of the device relevant? |
| Ergonomics | Even if not required, considering the ergonomics of usage will greatly improve the perception of quality of your work! |
| Manufacturability | Can all parts be manufactured or are available of-shelves? Ask for help if you are unsure! |
| Assembly | Can it be assembled and how is the assembly-sequence? |
| Control | Any need for open- or closed-loop control? Reaction timings, dynamics of this? |
| Mounting | if part of a larger assembly |
| Transport | Does it has to be moved, if so, mounting points, size to fit through a door, weight |
| Noise | Rattle/squeek/mechanical play/operational noises of relevance? |
| Repair | Does it need to be repaired, in which areas, and how to access later |
| Costs | Prototype costs, series costs |
| Timing | Major milestones for the development and the delivery |
| Quantity | What quantity of the device needs to be built in which time - will greatly influence the emphasis and balance between manufacturability/assembly vs. all other features |