ÏH
79
application: defined by the inputoutput facilities, and by the
desired performance level;
quality determined by the accuracy, reliability and stability,
economy defined by time, cost, and facilities for maintenance.
The tests should be conducted according to the same principles
as those used in the design of the system. The mathematical models
upon which the functioning of a system is based, are known from
the stage of design. The requirements on application, quality and
economy should have been mutually balanced at that stage.
ZZÏ
fig. 2
The procedure of design, shown in this figure, can be applied to
several alternative solutionsthe optimum solution is accepted.
Our further interest will be devoted to the evaluation of quality.
The quality is determined with respect to two basic properties:
EVALUATION
APPLICATION QUALITY^nrtfËCONOMY
fig. i
initial
specifications
ENVIRONMENT
QUALITY
APPLICATION
ECONOMY
SYNTHESIS
feedback
DESIGN OF SYSTEM
CONFIGURATION
-H ANALOGUE MODEL
ANALYSIS OF
PERFORMANCE
MATHEMATICAL
MODEL
SYSTEM
ANALYSIS
EXPERIMENT
theoret cal
PERFORMANCE
experimental
