Examination of hydraulic amplifiers in the aspect of lifetime prediction

• Autorzy: Jastrzębski G. , Ułanowicz L.
• Języki publikacji: EN

Abstrakty

EN

The paper presents the lifetime analysis for a hydraulic amplifier and considers two types of the flow distributing devices, i.e. a linear distributings lider and a rotarys lider. Description of essential properties associated with operation of distributing devices in hydraulic amplifiers is included with particular attention to analysis of processes that affect wear and tear of hydraulic amplifiers and influence quality of their operation. In that context a set of parameters that determine operation quality of hydraulic amplifiers was found out where mutual independence of the parameters, their unambiguousness and measurability served as the criteria for selection there of two methods of analysis were used that took account for the foregoing assumption, i.e. the method of maximum informative capacity of the parameter and the method that assumes maximum alteration of the technical condition due to execution of the test. The completed examinations made it possible to find out characteristic curves for hydraulic amplifiers with a linear distributing slider as well as with a rotary slider with regard to their accumulated operation time. Further predictions of the hydraulic amplifier lifetime take advantage of the assumption that the deterioration effect of functional parameters attributable to hydraulic amplifiers is represented by a series of time-related values (y1,y2.....yn)i.e. a set of discrete observations {y1=ksi(teta)} associated with an unsteady stochastic process ksi(teta). The relationships how functional parameters o f a hydraulic amplifier vary in pace with its operation time t are described by means of the Gaussian distribution with the assumption that the course of a functional parameter deterioration corresponds to its aggregated characteristic curve that represents resistance of a distributing device embedded into a hydraulic amplifier to wear and tear processes. Wear of crucial parts within a hydraulic amplifier is measured in terms how functional parameters of that part associated with its accuracy, sensitivity and switching speed are getting worse and worse as time goes by.

Słowa kluczowe

EN

hydraulic amplifier; distributing slider; hydrodynamic radial force; insensitivity (dead) zone of a hydraulic amplifier; durability (lifetime)

• Wydawca: Łukasiewicz Research Network - Institute of Aviation ; European Science Society of Powertrain and Transport KONES Poland ; Wydawnictwo Instytutu Technicznego Wojsk Lotniczych
• Czasopismo: Journal of KONES
• Rocznik: 2010
• Tom: Vol. 17, No. 3
• Strony: 165--172
• Opis fizyczny: Bibliogr. 7 poz., rys.

Twórcy

autor

Jastrzębski G.

autor

Ułanowicz L.

• Air Force Institute of Technology Księcia Bolesława Street 6, 01-494 Warsaw, Poland tel: [phone],

Bibliografia

• [1] Cieciura, M, Stasierski, J., Components of the atistical decisions, Publishing House of the Military University of Technology, Warsaw 1974.
• [2] Tylicki, H., Optimization of processes dedicated to prediction of technical condition demonstrated by mechanical vehicles, University Journal of the Technical and Nature University, Bydgoszcz, pp. 93-129.
• [3] Ułanowicz, L., Parametrical identification of destructive processes in avionic hydraulic drives, Issues of Machinery Operation, Vol. 1 (149), pp. 63-68, 2007.
• [4] Ułanowicz, L., Violation of the steady-state friction behaviour of a precise hydraulic pair due to imbalanced radial hydrostatic force, Journal of KONBIN, No. 2-3 (14-15), pp. 341-358, 2010.
• [5] Ułanowicz, L., Outline of the method to operate hydraulic drives by their technical condition with continuous monitoring of their parameters, Polish Journal of Environmental Studies, Vol. 18, No. 4B, pp. 206-211, 2009.
• [6] Complex thesis, Long lasting tests of hydraulic amplifiers type BU-220 and BU-250, Air Force Institute of Technology internal description, Warsaw 1998.
• [7] Complex thesis, Lasting and infallibility attempts of hydraulic amplifiers type BU-45A and BU-51MS, Air Force Institute of Technology internal description, Warsaw 1989.