Effect of dynamic properties attributable to hydraulic lines onto operation of avionic

• Autorzy: Ułanowicz L.
• Języki publikacji: EN

Abstrakty

EN

The present paper is dedicated to discuss how dynamic parameters of a hydraulic line intended to transfer hydraulic power from a source of hydraulic power (a hydraulic pump) to an actuating device (a hydraulic motor) can affect operation of an avionic hydraulic drive. Avionic hydraulic drives are operated with fast-varying waveforms of flow intensities and pressures. It is why analysis of most hydraulic drive systems must take account of compressibility of working fluid and elasticity of hydraulic lines. It leads to a wave model for propagation of energy variation down a hydraulic line (a pipe). The paper deals with flow of a compressible liquid via a hydraulic line with flexible walls. Theoretical deliberations were successfully verified by experimental research studies that were carried out on a dedicated test bench, therefore the presented amplitude vs. frequency characteristic curves of the hydraulic line could be obtained from both theoretical considerations and experimental research studied. The experimental research studies were carried out for hydraulic line terminated with a fixed flow restrictor alone and a flow restrictor combined with a hydraulic accumulator as well as for a hydraulic line supplied from a source of constant pressure and terminated with a valve with adjustable flow together with a hydraulic accumulator. The theoretical calculations for the amplitude vs. frequency characteristic curve are based on a model for a hydraulic line with its resistance depending on frequency.

Słowa kluczowe

EN

fluid power transmission; pump delivery; volume flow rate; hydrostatic (forcing) pressure; compressibility effect; viscous friction effect

• 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: 2011
• Tom: Vol. 18, No. 4
• Strony: 535--542
• Opis fizyczny: Bibliogr. 4 poz., rys.

Twórcy

autor

Ułanowicz L.

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

Bibliografia

• [1] Ułanowicz, L., Dynamic properties of hydraulic lines for fluid power transmission, Research Works of Air Force Institute of Technology, Is. 23, pp. 89-143, 2008.
• [2] Ułanowicz, L., The model description for flow of working fluids down long hydraulic lines, Pneumatics 3 (72), pp. 16-24, 2009.
• [3] Ułanowicz, L., Dynamic properties of a hydraulic system considered as a pipeline with impedance load, Pneumatics, 4(73), pp. 30-33, 2009.
• [4] Ułanowicz, L., Analysis of dynamic properties of hydraulic lines for fluid power transmission, Journal of KONES Powertrain and Transport, Vol. 17, No. 3, pp. 467-475, 2010.