Chapter 2 Flashcards
first and most important phase of the system design and development process
Conceptual Design Phase
it is an early and high-level life-cycle activity with the potential to establish, commit, and otherwise predetermine the function, form, cost, and development schedule of the desired system and its products
Conceptual Design Phase
it should be performed with the objective of translating a broadly defined “want” into a more specific system-level requirement
Need Analysis
A structured process or mechanism for determining customer requirements and translating them into relevant technical requirements that each functional area and organization level can understand and act upon.
Quality Function Deployment (QFD)
Quality Function Deployment (QFD) Process
Step 1: The customer and the customer needs and wants: The voice of the customer
Step 2: Translating the voice of the customer: The QFD Process
System Operational Requirements
- Mission
- Performance or physical parameters
- Operational deployment or distribution
- Operational life cycle
- Utilization requirement
- Effectiveness factors
- Environment
Translates customer requirements into technical requirements
Product Planning
Translates technical requirements into component characteristics
Product Design
the systems engineering process generally commmences with the identification of a “want” or “desire” for something based on some “real” deficiency
Problem Definition and Need Identification
Identifies process steps and parameters and translates them into process characteristics
Process Planning
Assigns control methods to process characteristics
Process-Control Planning
It is also known as advance development
Preliminary Design Phase
It extends the translation of system level requirements into design requirements for the subsystem level
Preliminary Design Phase
It refers to a specific or discrete action that is necessary to achieve a given objective
Function
It is accomplished with the objective of evaluating the different technological approaches that may be considered in responding to the specified functional requirements
Feasibility Analysis
Is an iterative process of breaking requirements down from the system level to the subsystem and as far down the hierarchical structure as necessary to identify input design criteria and or/ constraints for the various elements of the system.
Functional Analysis
Requirements for Feasibility Anslysis
- Identify the various possible design approaches that can be pursed to meet the requirements
- Evaluate the most likeley candidates in terms of performance effectiveness, logistics requirement, and life-cycle economic criteria
- Recommend a preferred approach
identification of the prime mission of the system and alternate or secondary mission
Mission definition
definition of the operating characteristics or functions of the system such as size, weight, range, accuracy, bits, capacity, transportation, receive, etc.
Performance and Physical Parameters
identification of the quantity of equipment, software, personnel, facilities, and so on.
expected geographical location to include transportation and mobility requirements
Operational deployment or distribution
anticipated time that the system will be in operational use
Operational life cycle (horizon)
anticipated usage of the system and its elements (e.g., hrs of operations per day, percentage of total capacity, operational cycles per month, facility loading, etc.)
Utilization requirement
Effectiveness Factors
a) Cost/system effectiveness
b) Operational availability, readiness rate, dependability
c) Logistics support effectiveness
d) Mean time between maintenance (MTBM)
e) Failure rate
f) Maintenance downtime (MDT)
g) Facility utilization
h) Operator skill levels
i) Task accomplishment requirements
j) Personnel efficiency
Serves as a basis in the development of the following:
- Electrical and mechanical design for functional packaging, condition monitoring and diagnostics provisions
- Reliability models and block diagram
- FMECA
- FTA
- RCM Analysis
- System safety/ hazards analysis
- Maintainability Analysis
- Level of repair analysis
- MTA
- OTA
- OSDs
- Supportability analysis
- Operating and maintenance procedures
- Functionality and disposability analysis
Functional Analysis
system is expected to operate (e.g., temperature, humidity, artic or tropics, mountains, or flat terrain, airborne, ground, shipboard, etc.)
Environment
Maintenance and Support Concept
- Maintenance and support planning
- Supply support (spare/repair parts and associated inventories)
- Maintenance and support personnel
- Training and training support
- Test, measurement, handling, and support equipment
- Packaging, handling, storage/warehousing, and transportation
- Maintenance facilities
- Computer resources (hardware and software)
- Technical data, information systems, and databases structures
FMECA
Failure mode, effect, and criticality analysis
FTA
Failure Tree Analysis
RCM
Reliability-centered maintenance analysis
MTA
Maintenance Task Analysis
specific performace-related factors are identified and applied with the objectives of ensuring that the system will be designed and developed such that it will satisfactorily accomplish its intended mission
Technical Performance Measures (TPMs)
OTA
Operator Task Analysis
OSDs
Operational Sequence Diagrams
This involves a top-down distribution of the quantitative and qualitative criteria through the QFD analysis.
Allocation of Requirement