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60 Cards in this Set
- Front
- Back
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Engineering modeling step 1 |
Begin by formulating a question "Who are you, comrade question?" |
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Engineering modeling step 2 |
Develop a list of assumptions |
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Engineering modeling step 3 |
Develop an appropriate model Celebrities are generally not good models |
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Types of engineering models 1 |
Physical - Scale model, mock up, test app
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Types of engineering models 2
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Graphical - CAD, sketches |
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Types of Engineering models 3
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Analytical - maths
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Levels of Models |
In increasing complexity:
Gut Feel Order of Magnitude Upper and Lower Bounds Performance Prediction |
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Design Evaluation Cycle |
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How do we gain knowledge at less cost than failing late |
Fail early, fail often
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P Diagram |
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P diagram step 1 |
Identify output responses
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P diagram step 2 |
Determine how accurate the output needs to be |
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P diagram step 3 |
identify input signals, control parameters and their limits, noises |
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P diagram last step |
Verify Results |
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The more you know... |
The more you realize what you don't know |
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Circle of influence |
very small circle within circle of control |
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Richest man of babylon (rmb) rule 1 |
start saving 10 percent of income |
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rmb rule 2 |
control expenditures |
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rmb rule 3 |
invest to earn a return |
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rmb 4 |
invest in secure assets to protect money |
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rmb 5 |
pay off your major debts |
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rmb 6 |
insure income for old age to protect family |
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rmb 7 |
increase ability to earn |
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types of assembly operations |
Retrieve, handle, mate |
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Best score on dfa workshet |
104 |
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For better dfa, minimize |
component count use of seperate fasteners Tangling nesting flexibility |
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for better dfa, avoid |
base repositioning component characteristics that complicate retrieval |
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for better dfa, design: |
With a base component for locating others with an efficient assembly sequence for specific types of retrieval for symmetry non symmetric parts to be clearly nonsymmetric all parts from same direction using chamfers, leads and compliance maximum component accessibility |
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Precedence: |
COnnection A must be before connection B Connections diagram |
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dfa influences design by |
encouraging fewer parts, each one possibly more complicated |
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dfa may result in |
more expensive tooling |
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dfa most appropriate for |
mass produced products |
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Habits of thought for math modeling |
Ask why do we need it how will it be used what specifically do we want to find what data is given what can be assumed how should we develop it what physical prinicples to apply what will it predict are the predictions valid can we verify it can we improve it |
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Dimensions and units |
keep them consistent, and in the same net dimenstions |
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mathematical models are: |
physical idealizations of systems |
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models developed to |
increase understanding of how a system works |
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design = system defined by: |
geometric configurations, materials used and tasks being performed |
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documenting a model (dm) step 1 |
purpose- concise statement of what is to be answered |
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dm step 2 |
assumptions |
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dm step 3 |
p diagram |
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dm step 4 |
variables |
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dm step 5 |
system and component diagrams |
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dm step 6 |
FBDS as needed |
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dm step 7 |
derivations of final equations |
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dm step 8 |
show final equations |
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dm step 9 |
graphs showing key relationships |
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FMEA |
Systematic approach to identify and prioritize risks of potential failure modes and prioritizing risk minimization efforts |
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FMEA goals |
eliminate or minimize failure modes design for safety focus on quality of design |
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Severity |
how serious a failure is, low s means no effect on customer, high s means youve probably killed them you imbecile |
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occurence |
the likelihood of a failure occuring |
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detectability |
likelihood that current controls keep a failure from reaching the customer |
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RPN |
Risk Priority Number = Detectability * Occurence * Severity |
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fmea step 1 |
describe with p diagram |
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fmea step 2 |
id failure modes (how is it not reaching design intent) |
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fmea step 3 |
describe the effects of failures (result on the customer) |
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fmea step 4 |
Determine causes for failure (action or inaction caused by design |
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fmea step 5 |
describe the controls on the process |
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fmea step 6 |
rate severity, occurence, detection on a 1-5 scale, compute Rpn |
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fmea step 7 |
propose and take action
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fmea step 8 |
assess the actions taken and determine new S, O, D and RPN |
