Task 1: NASA Trade Study Example

1) Objective:
a) Analyze a NASA trade study example related to selecting an engine system for a space craft.
b) Apply the AHP method to prioritize and select the most suitable engine.

2) Steps:
a) Problem Definition:

i) Describe the trade-off scenario (e.g., type of engine, existing or new, hint research large-
scale rocket motors; Aerojet, SPACEX, AVIO, Orbital ATK, Blue Orgin)

b) Criteria Identification:
i) Identify relevant criteria (e.g., environmental impact, cost, energy efficiency).

c) Pairwise Comparisons:
i) Create a matrix to compare criteria pairwise (using relative importance).

d) Weight Calculation:
i) Calculate criteria weights based on the matrix.

e) Alternative Evaluation:
i) Evaluate each fuel option against the criteria.

f) Ranking and Decision:
i) Determine the best option using AHP.

Homework 4

1) Determine the shape factor for each of the extrusion die orifice shapes in the figures
below
(a) rectangular bar, (b) tube, (c) channel, and (d) cooling fins.

2) A cylindrical billet that is 100 mm long and 50 mm in diameter is reduced by indirect
(backward) extrusion to a 20 mm diameter. The die angle is 90°. The Johnson
equation has a = 0.8 and b = 1.4, and the flow curve for the work metal has a
strength coefficient of 800 MPa and strain hardening exponent of 0.13.
Determine (a) extrusion ratio, (b) true strain (homogeneous deformation), (c) extrusion
strain, (d) ram pressure, and (e) ram force.

Learning Intention: Students will create a fruit soda advertisement that represents all the skills they have been learning thus far.

Success Criteria-Soda Advertisement:

• I know how to use the various brush/eraser tools to create my background
• I can use selection, copy, paste, and manipulation tools to create the sliced fruit effect
• I know how to add shadows/highlights within the image
• I can install and use the splash brush to create the splash effect
• I am able to add text and a slogan for the product

The problem has 11 parts to it (a-k). Specific instructions are given in the pdf file labeled “Instructions”. PDF files “example AA”, “example BB”, and “example CC” are all examples of how the professor prefers work to be shown and carried out. Please pay close attention to the way certain formulas are written in the example pdfs because that is how he prefers assignments be presented. Please handwrite all parts of the solution on paper in clear and legible writing.