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2.9 Problems

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1 2.1 Identify and describe briefly the main subsystems of a family car and establish a system breakdown structure for the car.

2 2.2 Establish a function tree for a (domestic) refrigerator.

3 2.3 List the environmental, operating, and maintenance factors that should be considered when defining the operating context of a family car.

4 2.4 List some information functions that are available in a modern car.

5 2.5 Identify the main functions of a family car and establish a function tree for the car.

6 2.6 List some safety functions of a modern car. Are the identified functions online or offline functions?

7 2.7 Identify and describe the functions of the front door of a house.

8 2.8 Describe the functions of a vacuum flask (thermos) and suggest relevant performance criteria.

9 2.9 Describe briefly a system you consider to be complex.

10 2.10 Refer to the SADT functional block (see Figure 2.3) and list all the inputs, controls, and resources you need to bake a pizza. The output from the function is the new‐baked pizza. How would you set up the performance criteria for your pizza?

11 2.11 Based on an Internet search, explain what is meant by a CONOPS and list its main elements.

12 2.12 Based on an Internet search, list the main elements that are typically included in a system requirements document (or a system requirements specification).

13 2.13 Establish an RBD of the braking system of a family car.3

14 2.14 Consider a voted oo structure. The voting can be specified in two different ways:– As the number out of the components that need to function for the system to function.– As the number of the components that need to fail to cause system failure.In the first case, we often write oo:G (for “good”) and in the second case, we write oo:F (for failed).Determine the number such that a 2oo4:G structure corresponds to a oo4:F structure.Determine the number such that a oo:G structure corresponds to a oo:F structure.

15 2.15 Are there any examples of standby redundancy in a family car? Justify your answer.

System Reliability Theory

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