SYSTEM ASSIGNMENT
Question 1 (13 × 2 = 26 pts.): Answer the following short answer or multiple choice questions.
Circle or underline the answers for the multiple choice questions, or provide you answers for the short answer questions in the provided blank space after the question only (i.e., your short answers should be, well, short ☺).
1.1 What is a system? Give an example that fits your definition of a system. (Hint: Provide a system example that is appropriate for being designed using the systems engineering process, as you will need to refer back to your selected system in several subsequent questions).
What is systems thinking? Consider the system you selected previously at question 1.1 and discuss the value of systems thinking process if it were to be applied to your selected system.
1.3. Which of the following is not a systems science discipline?
a) Systems engineering
b) Systems dynamics
c) General systems theory
d) Electrical engineering
1.4. Define the lifecycle for a system. Draw the stages of a system’s lifecycle. Discuss the lifecycle characteristics for the system you selected at question 1.1.
1.5. What is the difference that systems engineering makes between system primary functions and system secondary functions? Identify the system primary function(s) and system secondary functions for the system you selected at question 1.1.
1.6. In which systems engineering process stage is the largest commitment to technology, performance, and cost made?
a) Production and/or construction
b) Operation and support
c) Detail design and development
d) Conceptual and preliminary design
1.7. Provide two examples of system specifications for the system you selected in question 1.1.
1.8. In which systems engineering process stage is the requirements development process started?
a) Conceptual design
b) Preliminary design
c) Detail (configuration item) design
d) Implementation verification
1.9. What are the design dependent parameters (DDPs)? What are the design independent parameters (DIPs)? Consider again the system you selected at question 1.1, and give two examples of DDPs and two examples of DIPs.
1.10. Define Domain Requirements and Non-Functional Requirements. Provide an example of each for the system selected in question 1.1.
1.11. What is meant by “true” testing and in which stage of the systems engineering process is the “true” test performed? Considering again the system you selected at question 1.1, briefly describe how you would have the “true” test performed?
1.12 A system (vehicle) main function is to transport a group of students from city A to city B on Florida’s turnpike (a toll road). The vehicle is equipped with a SunPass device (a prepaid toll program) and such it does not need to stop at any of the toll plazas on route from city A to city B.
With regard to the system main function, in which of the following categories would you include the SunPass device?
e) Inputs
f) Outputs
g) Controls
h) Mechanisms
Question 2 (10 × 3 = 30 pts.): Answer the following requirements development questions.
2.1 Consider the following statements and choose the correct answer.
2.1.1 The objective of the verification process is to “build the system right.” What does that mean?
a) Ensure that the system complies with the system requirements and conforms to its design.
b) Ensure that the system does what it is supposed to do in its intended environment.
2.1.2 The objective of the validation process is to “build the right system.” What does that mean?
a) Ensure that the system complies with the system requirements and conforms to its design.
b) Ensure that the system does what it is supposed to do in its intended environment.
2.2 Consider the following requirements and choose the correct answer. Provide short answers, if your selected answer asks for that.
2.2.1 The probability of receiving an incorrect bit on the telecommunications channel shall be less than 0.001.
a) The requirement can be verified through testing.
b) The requirement cannot be verified through testing. If the requirement cannot be verified through testing, propose another means of verification.
2.2.2 The probability of loss of life on a manned mission to Mars shall be less than 0.001.
a) The requirement can be verified through testing.
b) The requirement cannot be verified through testing. If the requirement cannot be verified through testing, propose another means of verification.
2.2.3 The probability of the system being canceled by politicians shall be less than 0.001.
a) The requirement can be verified through testing.
b) The requirement cannot be verified through testing. If the requirement cannot be verified through testing, propose another means of verification.
2.2.4 The system shall be available 99.9% of the time.
a) Incorrect
b) Incomplete
c) Inconsistent
d) Ambiguous
2.3 The following text is used for questions 2.3.1 – 2.3.4: Consider the following set of requirements for an electric water heater controller and chose the correct answer. Provide short answers, if your selected answer asks for that.
When the system signals a temperature higher than 70°, but lower than 100°, the system shall output 3000 Watts.
When the system signals a temperature of 100° or higher, but lower than 130°, the system shall output 2000 Watts.
When the system signals a temperature of 120° or higher, but lower than 150°, the system shall output 1000 Watts.
When the system signals a temperature of 150° or higher, the system shall output 0 Watts.
2.3.1
a) The set of requirements is correct.
b) The set of requirements is incorrect. If the set of requirements is incorrect, identify
the condition, status, reason, or piece of information that makes the set of
requirements incorrect.
2.3.2
a) The set of requirements is unambiguous.
b) The set of requirements is ambiguous. If the set of requirements is ambiguous,
identify the condition, status, reason, or piece of information that makes the set of
requirements ambiguous.
2.3.3
a) The set of requirements is complete.
b) The set of requirements is incomplete. If the set of requirements is incomplete,
identify the condition, status, reason, or piece of information that makes the set of
requirements incomplete.
2.3.4
a) The set of requirements is consistent.
b) The set of requirements is inconsistent. If the set of requirements is inconsistent, identify the condition, status, reason, or piece of information that makes the set of requirements inconsistent.
Question 4 (40 pts.):
You are assisting a firm during the conceptual design process for a new system designed to automate the food production for a senior living facility. The new system must perform the following functions
Deliver food to residents
Heat food to serving temperature
Store food safely
Put finished food on plate.
Collect dirty dishes from resident when complete.
Create a Morph Chart to explore different potential solutions for this design challenge.
Question 5 (60 pts.):
Three requirements elicitation techniques (Designer as Apprentice, Task Analysis, and Interviews) were used to obtain the process of designing and bringing new products in an assemble-to-stock company that produces components for aircraft systems described below:
The first step is to design the product, based upon marketing data and engineering data. This must be done for no more than X $. Once the product is designed, the assembly plan is generated.
Facility data is used to ensure that the assembly plan is feasible. Three months are available for designing the product and developing the assembly plan.
The assembly line is then designed. This consists of three steps as follows:
Assign tasks to stations (also establish how many stations).
Determine the equipment requirements at each station, based upon task station assignments and the product design. Facility data and equipment catalogs are also used for this step.
Determine how to arrange the stations on the assembly line, based upon the task assignments, number of stations, and facility data.
Once these steps have been completed, the assembly line design, along with the required monthly production quantity and some labor loading data, are used to determine the production plan.
Finally, the production plan and product design data are used to determine suitable inventory control policies for the assembly line. The product design, assembly plan, assembly line design, production plan, and inventory control policies are all used as inputs to other planning activities.
Develop an IDEF0 model for this process. Your model should consist of informational activities only, and no mechanisms need be presented.
