Chapter 2 Questions Flashcards
True/False: Defining mission objectives involves reducing the number of design options to a manageable level, without inadvertently discarding those options that offer significant advantages.
True
True/False: The primary purpose of clearly defining mission architectures early on is to provide enough quantitative detail to permit accurate and meaningful trades and comparisons between alternatives.
True
True/False: The ROM cost is too coarse an estimation tool to support key trades and system evaluations merely through our knowledge of relative values.
False
True/False: Space missions are far too critical to involve “hidden agenda” items; hence, secondary, non-technical objectives can be ignored or discounted.
False
True/False: The starting point of the highly iterative mission design process Is actually not very flexible and should be either from the topmost broad mission objectives, or from the bottom with the development of some new essential technical breakthrough, but never in the middle steps.
False
True/False: Reviewing the preliminary requirements and constraints is better done early in the process because you may lose the chance to change, adapt, or negotiate them and hence bound the limits of the system you are developing.
True
True/False: Mistakes in identifying system drivers and their limiting factors can lead to confusing mission parameters and trades whose unfocused outcomes may negatively impact mission performance, risk, schedule, and cost.
True
Order the steps in the iterative mission design process for the first pass through
a.
1 - Define Mission Objectives
2 - Identify system drivers and critical requirements for each concept and architecture
3 - Define mission requirements and constraints
4 - Define baseline mission concept and architecture
5 - Create alternative mission concepts and architectures
b.
1 - Identify system drivers and critical requirements for each concept and architecture
2 - Define Mission Objectives
3 - Define baseline mission concept and architecture
4 - Create alternative mission concepts and architectures
5 - Define mission requirements and constraints
c.
1 - Define Mission Objectives
2 - Define mission requirements and constraints
3 - Create alternative mission concepts and architectures
4 - Identify system drivers and critical requirements for each concept and architecture
5 - Define baseline mission concept and architecture
d.
1 - Define Mission Objectives
2 - Define baseline mission concept and architecture
3 - Identify system drivers and critical requirements for each concept and architecture
4 - Create alternative mission concepts and architectures
5 - Define mission requirements and constraints
c.
1 - Define Mission Objectives
2 - Define mission requirements and constraints
3 - Create alternative mission concepts and architectures
4 - Identify system drivers and critical requirements for each concept and architecture
5 - Define baseline mission concept and architecture
Which two elements make up the mission architecture?
a. Preliminary Risk Assessment, Definition of Major Mission Elements
b. Definition of Major Mission Elements, Rough Order of Magnitude Cost
c. Rough Order of Magnitude Cost, Preliminary Risk Assessment
d. Definition of Major Mission Elements, Mission Concept
d. Definition of Major Mission Elements, Mission Concept
Choose statements that meet the criteria for effective Mission Objectives
a. Land a man on the Moon and return him safely to the Earth
b. Recover, process and utilize Helium 3 from Lunar regolith
c. Increase our knowledge of ancient sediment displacements on Mars
d. Decide the best solar array cleaning methods for Martian dust
e. Practice using 3D printing to make replacement wheels for Lunar Rover
f. All of the above
g. Only a, b and c
g. Only a, b and c
Top-level mission requirements and constraints generally flow from Mission Objectives, but are more quantifiable and yet may still change and be re-negotiated during the design process because of:
a. Technological improvements during the design process
b. Budget adjustments
c. Hidden addenda items (political, legal, national price, etc.)
d. Mission trades and preliminary analyses
e. Choice of launch vehicle and site
f. A, b, d and e
g. All of the above
g. All of the above
What are the principal advantages for including human crew instead of purely autonomous systems and robotics in exploration missions?
a. Workload sharing is facilitated because crew members can be multi-talented
b. Incorporating life support systems raises the overall TRL for the space system
c. Human decision making and adaptive reasoning vastly increases flexibility and probability of success for the overall mission
d. Safety requirements are simplified
e. Usable orbit trajectories are more limited and hence simpler to choose
f. All of the above
g. Both a and c
g. Both a and c
If the merit M of a particular mission can be calculated with Eq. 2-2 M = p(V1V2..Vn/C), where p is the probability of mission success, Vn is mission value, and C represents mission cost, then which factor(s) of mission value Vn will work quantifiably to provide a defensible comparative metric for comparing competing mission options?
a. Vn = number of core samples of surface material
b. Vn = mass of samples collected and returned
c. Vn = total time spent in productive EVAs
d. Vn = number of structures erected
e. All of the above
f. Only a, b and c
f. Only a, b and c
