Lesson 2 Flashcards
Foundation of entire system design and the first and most important phase of the system design and development process
Conceptual Design Phase
Conceptual Design Process
- Problem Definition and Need Identification
- System Design and Feasibility
- System Operational Requirements
- The Maintenance and Support Concept
- Technical performance measure
It should be performed with the objective of translating a broadly defined want into a more specific system level requirement.
Need Analysis
It is accomplished with the objective of evaluating the different technological approaches that may be considered in responding to the specified functional requirements.
Analysis Feasibility Analysis
Identification of prime mission of the system and alternate or secondary mission.
Mission Definition
̶Identification of the quality of equipment software personnel facilities and so on and the expected geographical location to include transportation and mobility requirements.
Operational Development or Distribution
Definition of the operating characteristic or functions of the system such as size weight range accuracy bits capacity transportation receive etc.
Performance and Physical Parameters
Anticipated time that the system will be in operational use.
Operational Life Cycle(horizon)
Anticipated usage of the system and its elements (e.g., hours of operation per day, percentage of total capacity, operational cycles per month, facility holding, etc.)
Utilization Requirement
Effectiveness Factors
o Cost system effectiveness
o Operational availability, readiness rate, dependability
o Logistics report effectiveness
o Mean time between maintenance
o Failure rate
o Maintenance downtime
o Facility utilization
o Operator skill levels
o Task accomplishment requirements
o Personal efficiency and so on
The system is expected to operate (e.g., temperature, humidity, arctic or tropics, spontaneous or flat terrain, airborne, ground, shipboard, etc.
Environment
The 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 database structures
Identified and applied with the objective of ensuring that the system will be designed and developed such that it will satisfactorily accomplish its intended mission.
Technical Performance Measure (TPMS)
Structured process or mechanism for determining customer requirements and translating them into relevant technical requirements that each function area and organization level can understand and act upon.
Quality functions deployment
It is also known as advanced development and It extends the translation of system level requirements into design requirements for the subsystem level.
Preliminary design phase
It 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
This technique is a straightforward method that assigns equal reliability requirements for all subsystems based on the system requirements.
Equal apportionment technique
Can be defined as the probability that a system or product will perform in a satisfactory manner for a given period of time when used under specified operating conditions.
Function
It is first determined, and then previous history or other estimation methods are used to provide a weighing for each subsystem to determine what the individual subsystem failure rate must be to achieve the system reliability requirement.
Failure rate
Overall system and its major subsystems in hand one may proceed to the realization of specific system components.
Detailed design and development phase
It is the characteristic of design and installation that reflects the is accuracy safety and economy of performing maintenance actions.
Maintainability
Failure rate formula
FR = 1 / MTBF or R/T
Mean Time between Failure formula
MTTF/MTBF = Operating time / No. of failure
Maintainability allocation formula
Mt = MTBF (1-A) / A
