22nd Congress of International Council of the Aeronautical Sciences, Harrogate, UK, 28 August - 1st September, 2000
Paper ICAS 2000-5.9.4
MATHEMATICAL MODEL BASED METHODS TO INVESTIGATE MANUFACTURING ANOMALIES
L. Pokoradi, R. Szabolcsi, J. Bera
Miklós Zrínyi National Defense University, Budapest, Hungary
Keywords: mathematical model based methods, manufacturing anomalies
During the design of new aircraft systems, their
manufacturing tolerances should be determined
basically by working requirements of the system
and technological possibilities of the
manufacturers. Therefore the determination of
manufacturing tolerances is a very important
and difficult task.
It is possible that system parameter values
are inadequate, but every unit and element of
the system meets its own requirements. Because
of the manufacturing tolerances of the units and
elements have been determined incorrectly.
It is possible too, that the working
requirements of the designed system have to
determine strictly the system parameter
tolerances. For example, these system
requirements can be velocity or acceleration of
the piston of aircraft hydraulic servo actuator,
from the flight mechanical point of view. These
external parameters should require very strictly
the tolerances of internal parameters of the
given system.
Using linearized mathematical diagnostic
model of the given system, the problems
mentioned above can be investigated and
solved.
Their densities, expected values and
variances can characterise manufacturing
anomalies of internal parameters. These
random characteristics determine the densities,
expected values and variances of external
parameters that is their manufacturing
anomalies.
This paper will show the methodology of
the linearized mathematical-diagnostic model’s
usage to investigate effects of manufacturing
anomalies. Investigation methods and their
inverse methods will be shown in case of the
Gauss-distributions and in case of unknown
(general) distributions of the internal
parameters.
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