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Senior Design > Lab 2: Parametric Sizing Process > Flashcards

Lab 2: Parametric Sizing Process Flashcards

1
Q

What are the general phases of aircraft development (design)?

A
  1. Conceptual Design
  2. Preliminary Design
  3. Detail Design

Lab 2 – Slide 4

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2
Q

Give a general definition of “conceptual design.”

A

Development and evaluation of design alternatives.

Lab 2 – Slide 4

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3
Q

Give a general definition of “preliminary design.”

A

Development of a baseline specification for manufacturing.

Lab 2 – Slide 4

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4
Q

Give a general definition of “detail design.”

A

Development, testing, certification.

Lab 2 – Slide 4

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5
Q

The conceptual design process consists of what three distinct steps?

A
  1. Parametric Sizing
  2. Configuration Layout
  3. Configuration Evaluation

Lab 2 – Slide 4

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6
Q

Parametric sizing gives ___________.

A

The definition of the gross vehicle design solution space.

Lab 2 – Slide 5

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7
Q

Describe the configuration Layout stage.

A

Brainstorming and initial sizing of possible configuration concepts.

Lab 2 – Slide 5

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8
Q

Describe the configuration evaluation phase.

A

Evaluation of initial configuration concepts and trade studies.

Lab 2 – Slide 5

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9
Q

What tools are available to complete the parametric sizing step.

A
  1. Standard Design Ladder
  2. Breguet Range
  3. Hypersonic Convergence
  4. Loftin Sizing
  5. Roskam I sizing

Lab 2 – Slide 6

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10
Q

Out of parametric sizing, configuration layout, and configuration evaluation, which is the “weak link” in conceptual design.

A

Parametric sizing.

Lab 2 – Slide 6

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11
Q

What tools are available for the completion of the configuration layout step?

A
  1. Brainstorming
  2. Database statistics
  3. Knowledge Expertise
  4. Design guidelines/rules
  5. AI

Lab 2 – Slide 7

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12
Q

Why are design related software applications avoided during parametric sizing?

A

Because they tend to obscure the design process in a “black box.”

Lab 2 – Slide 10

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13
Q

What variables are plotted on the Loftin convergence chart?

A
  1. Climb Criterion
  2. Take-off field length
  3. Max Speed
  4. Stall speed and landing field length

Lab 2 – Slide 10

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14
Q

The match point on the convergence chart is characterized by:

A
  1. Size Required
  2. Resulting weight
  3. Power required

Lab 2 – Slide 11

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15
Q

What are the design ladder steps? What is the most important item?

A
  1. Analyze
  2. Integrate
  3. Iterate
  4. Converge (most important)
  5. Screen
  6. Visualize
  7. Assess Risk

Lab 2 – Slide 11

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16
Q

Modern prop-driven aircraft are usually designed to meet what two performance objectives? What do these objectives entail?

A

Airport Performance
>Stall Speed
>Ldg/Takeoff length
>Climb perf
Cruise Performance
>Max cruise speed
>range
>payload

Lab 2 – Slide 12

17
Q

In terms of performance characteristics, the size required is a function of ____ and _______.

A

wing area
wing loading

Lab 2 – Slide 12

18
Q

In terms of performance characteristics, the resulting weight is a function of _______ and _______.

A

empty weight
fuel weight

Lab 2 – Slide 12

19
Q

In terms of performance characteristics, the power required is a function of _______ and _______.

A

power
power loading

Lab 2 – Slide 12

20
Q

What FAR is associated with the certification of GA?

A

Part 23

Lab 2 – Slide 13

21
Q

What FAR is associated with the certification of transport aircraft?

A

Part 25

Lab 2 – Slide 13

22
Q

True or False
The propulsive efficiency is the product of the prop efficiency and the installation efficiency.

A

True

Lab 2 – Slide 29

23
Q

What is the benefit of calculating the power index?

A

It serves as a constant of proportionality between the total drag coefficient and various aerodynamic and aircraft parameters.

Lab 2 – Slide 34

24
Q

CL_max depends on what design parameters?

A
  1. Airfoil Section
  2. Flap system
  3. Wing platform shape
  4. Wing surface roughness
  5. Reynolds Number

Lab 2 – Slide 37

25
Q

True or False
The stall speed of an airplane is independent of wing loading.

A

False. See Eq. 3.14 on slide 37.

Lab 2 – Slide 37

Senior Design (13 decks)

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