Computer Aided Building Physical Modeling

During the design of new technical systems, their manufacturing tolerances (i.e. system parameter uncertainties) should be determined basically by working requirements of the system and technological possibilities of the manufacturers. Therefore the determination of manufacturing tolerances can be a very important and difficult task. It is possible that system output parameter values are inadequate, but every equipment of the system meets its own requirements, because their manufacturing tolerances (allowable uncertainties) of 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. This paper will show the methodology of the linearized mathematical-diagnostic model’s usage to investigate effects of manufacturing parameter uncertainties.