Design sustainability and production choices
| English | 中文 | Pinyin |
|---|---|---|
| design for disassembly/dɪˈzaɪn fɔː ˌdɪsəˈsemblɪ/ | 可拆卸设计 | kě chāi xiè shè jì |
| tolerance/ˈtɒlərəns/ | 公差 | gōng chāi |
What would explain this observation?
- A repairable product may cost more initially but stay in service longer. A design decision needs evidence across manufacture, use and disposal.
- Start with a prediction. State the quantities or features you would compare, then decide what evidence could distinguish two explanations.
Build the model
- Design for disassembly 可拆卸设计 supports separation of materials and replacement of parts. Manufacturing choices depend on production volume, tolerances 公差, material properties and cost. Sustainability includes environmental and social effects.
- design for disassembly: Design supporting separation and replacement of parts; tolerance: An allowed dimensional variation.
Which supports repairability?
Compare a common service over a stated lifetime. Separate fixed tooling cost from cost per item. Include repair, energy, transport and realistic end-of-life pathways rather than using a recycled label as the whole judgement.
Match each technical term to its precise meaning.
Use the definitions to distinguish related quantities and processes.
Choose evidence that can test it
- Compare a common service over a stated lifetime. Separate fixed tooling cost from cost per item. Include repair, energy, transport and realistic end-of-life pathways rather than using a recycled label as the whole judgement.
- Create a bill of materials and an annotated assembly plan. Test whether a worn part can be replaced with normal tools. For HL project development, evaluate production feasibility and commercial assumptions against the applicable cohort guide.
Which two habits make the investigation or model in this case more defensible?
Create a bill of materials and an annotated assembly plan. Test whether a worn part can be replaced with normal tools. For HL project development, evaluate production feasibility and commercial assumptions against the applicable cohort guide.
Work from known quantities
- State the known values and their units. Choose the relation because its assumptions fit this case, then rearrange before substitution.
- Known: method A costs 600 fixed units plus 4 per item; method B costs 100 fixed units plus 9 per item. Equality: 600+4n = 100+9n. Rearranging: 500 = 5n, so n = 100 items. Other quality and sustainability criteria may change the choice.
Fixed costs differ by 400 units and unit costs differ by 5. Find cost break-even quantity. Use the same sequence: known quantities → model → relation → substitution → unit and interpretation.
Fixed costs differ by 400 units and unit costs differ by 5. Find cost break-even quantity.
The result is 80 items. Known: method A costs 600 fixed units plus 4 per item; method B costs 100 fixed units plus 9 per item. Equality: 600+4n = 100+9n. Rearranging: 500 = 5n, so n = 100 items. Other quality and sustainability criteria may change the choice.
Check the conclusion and its limits
- A cheaper process is not automatically preferable. Cost estimates need currency, quantity and assumptions, and prototypes do not prove mass-production consistency.
- Return to the original observation. Explain what the result supports, which conditions it assumes, and one way to test a competing explanation.
A recycled-content label establishes the entire product life-cycle impact. This claim is false: A cheaper process is not automatically preferable. Cost estimates need currency, quantity and assumptions, and prototypes do not prove mass-production consistency.
Design sustainability and production choices: Compare a common service over a stated lifetime. Separate fixed tooling cost from cost per item. Include repair, energy, transport and realistic end-of-life pathways rather than using a recycled label as the whole judgement.
A recycled-content label establishes the entire product life-cycle impact.
A cheaper process is not automatically preferable. Cost estimates need currency, quantity and assumptions, and prototypes do not prove mass-production consistency.
Design supporting separation and replacement of parts: write the technical term.
design for disassembly means Design supporting separation and replacement of parts.