Temat: pump delivery - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Wear processes of hydraulic plunger and barrel assemblies connected with the time of their work
Autorzy:: Ułanowicz, L.
Powiązania:: https://bibliotekanauki.pl/articles/246273.pdf
Data publikacji:: 2014
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: fluid power transmission
pump delivery
volume flow rate
hydraulic precision pair
avionic technology
Opis:: The article discusses the wear processes of hydraulic plunger assemblies connected with the time of their work and the impact exerted by these processes on the value of parameters of a hydraulic plunger pump. It describes working conditions and loading of a hydraulic plunger assembly. The paper presents also the results of empirical analyses of the wear process of the connection of the plunger base with the working surface of the swivel disk, which is related to time and conditions of its work. It discusses the impact of the loading value and sliding speed on the character and intensity of the wear of the connection between the plunger base and the working surface of a swivel disk. Furthermore, it presents a general characteristic and mechanism responsible for the wear of the hydraulic plunger assembly through oxidation. The article also analyses the impact of the hardness of materials used for producing the hydraulic plunger assembly on the intensity of its wear. Another issue is the dependence of the coefficient of friction in the hydraulic plunger assembly on the contact pressure at different sliding speeds. Finally, the paper discusses the impact of wearing of the cooperating plunger base and the working surface of the swivel disk on the initial parameters of the hydraulic pump at a given working pressure and its volumetric efficiency.
Źródło:: Journal of KONES; 2014, 21, 4; 515-524
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Outline of the method for prediction of lifetime achieved by ayionic hydraulic drives operated under real field conditions
Autorzy:: Ułanowicz, L.
Powiązania:: https://bibliotekanauki.pl/articles/242145.pdf
Data publikacji:: 2009
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: lifetime
probability density function
hydraulic drive
pump delivery
structural parameter
deterioration rate
wear and tear
Opis:: The presented approach to predict lifetime of avionic hydraulic drives belongs to a priori (accelerated) methods as by its nature it does not reeuire to continue tests until a hydraulic subassembly or drive reaches its boundary value of a structural parameter. The method uses distributions of a random variable with time-dependent variance as models for lifetime prediction. Variations of structural parameters over a discretional period of time are described with use of the Gaussian distribution with the assumption that the course of the process when the structural parameters are subject to deterioration comprises the entire probabilistic characteristic that defines resistance of the hydraulic drive to a wear and tear process. In that context distributions of characteristics for variations of structural parameters were determined for a selected period of time and it served as a basis to find out parameters for the distribution of the defect-free operation time. The completed functional and design decomposition of an example avionic hydraulic drive made it possible to obtain a hierarchical description of the hydraulic drive, to identify its structural parameters that are available during the drive operation as well as to define a set of measurable out put parameters of a system, a module (a hydraulic system) and a block (a hydraulic subassembly). The set of measurable output parameters attributable to the hydraulic system in question is described with use of mathematic equations that result from fundamental equations for hydraulic systems dynamics, i.e. the mass conservation law, the principle of momentum and angular momentum conservation as well as the energy conservation law.
Źródło:: Journal of KONES; 2009, 16, 2; 473-484
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Effect of dynamic properties attributable to hydraulic lines onto operation of avionic
Autorzy:: Ułanowicz, L.
Powiązania:: https://bibliotekanauki.pl/articles/247057.pdf
Data publikacji:: 2011
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: fluid power transmission
pump delivery
volume flow rate
hydrostatic (forcing) pressure
compressibility effect
viscous friction effect
Opis:: 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.
Źródło:: Journal of KONES; 2011, 18, 4; 535-542
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Analysis of dynamic properties of hydraulic lines for fluid power transmission
Autorzy:: Ułanowicz, L.
Powiązania:: https://bibliotekanauki.pl/articles/247615.pdf
Data publikacji:: 2010
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: fluid power transmission
delivery of a pump
volume flow rate
hydrostatic (forcing) pressure
compressibility effect
viscous friction effect
Opis:: This paper presents the results of a hydraulic line dynamic properties analysis taking into account inertia of the fluid flowing in rigid and flexible lines, the compressibility effect for this fluid and the viscous friction effect. The following are described and analyzed: solution of the wave equation in the form binding four variables: pressure and flow rate at the line input, and pressure and flow rate and the line output; two of the above-mentioned variables should be regarded as independent (input) and the other two as dependent (output), the accuracy comparison of distributed parameters model to lumped parameters model with regard to applicability range in hydraulic systems analysis, pressure value at given installation points as a response to rapid valve closing (transient response) or to valve opening (waterhammer effect). In these considerations the hydraulic line is regarded as a two-port with two inputs and two outputs with a definite transmittance matrix. Main considerations concern the variable resistance model. A general solution is given as a function of the Laplace operator. Introducing appropriate simplifications into the variable resistance model, the constant resistance model and lossless line model is obtained. Also, general solutions for three different lump parameter models are presented. For the lumped parameters lin presents three equivalent models possible, i.e. as: a symmetrical two-port, a two-port with shared resistance and a two-port with capacitance at the output.
Źródło:: Journal of KONES; 2010, 17, 3; 467-475
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Badania modelowe strumienia objętości piasku i wody w podnośniku powietrznym
Model studies of sand and water flow rate in an air lift pump
Autorzy:: Kalenik, M.
Powiązania:: https://bibliotekanauki.pl/articles/236558.pdf
Data publikacji:: 2017
Wydawca:: Polskie Zrzeszenie Inżynierów i Techników Sanitarnych
Tematy:: air-lift pump
air injector
three-phase flow
sand flow rate
water flow rate
delivery head
empirical formula
podnośnik powietrzny
mieszacz
przepływ trójfazowy
strumień objętości piasku
strumień objętości wody
wysokość podnoszenia
wzory empiryczne
Opis:: Analysis of results from a study on sand (Qz) and water (Qw) flow rate in an air lift pump was presented as well as the methodology of empirical formulas derivation to calculate those parameters. A comparative analysis of the values of sand and water flow rate from direct measurements and the calculated values was carried out. The scope of laboratory research encompassed derivation of the aforementioned empirical formulas to calculate water and sand flow rate for the plastic air lift pump with internal diameter of the delivery pipe d = 0.04 m, at fixed sand-water mix delivery heads of 0.40 m, 0.80 m and 1.20 m. Dimensional analysis and multiple regression were applied to derive the formulas. It was established that the water and sand flow rate decreased along with the increase of the delivery head, and the values of water flow rate were smaller than those of the sand flow rate. It was demonstrated that the air pressure in such devices cannot be lower than 110 kPa or exceed 175 kPa as at higher pressure values the sand and water flow rate started to fall. The values of sand and water flow rates calculated by the derived formulas coincided very well with the values determined by direct measurements using the 1:1 scale laboratory model.
Przedstawiono analizę wyników badań strumienia objętości piasku (Qz) i wody (Qw) w podnośniku powietrznym oraz omówiono metody wyznaczania wzorów empirycznych do obliczania wartości tych parametrów. Przeprowadzono analizę porównawczą wartości strumienia objętości piasku i wody wyznaczonych w bezpośrednich pomiarach z wartościami obliczonymi za pomocą wzorów empirycznych. Zakres badań laboratoryjnych obejmował wyprowadzenie wzorów do obliczania wartości strumienia objętości piasku i wody w powietrznym podnośniku z tworzywa sztucznego o średnicy wewnętrznej rurociągu tłocznego d=0,04 m, przy zadanych wysokościach podnoszenia mieszaniny piasku i wody równych 0,40 m, 0,80 m i 1,20 m. Do wyznaczenia wzorów empirycznych do obliczania wartości strumienia objętości piasku i wody zastosowano analizę wymiarową i metodę regresji wielokrotnej. W przypadku badanej konstrukcji podnośnika powietrznego stwierdzono, że wraz ze wzrostem wysokości podnoszenia mieszaniny piasku i wody strumień objętości piasku i wody malał, a wartości strumienia objętości wody były mniejsze od wartości strumienia objętości piasku. Wykazano, że w urządzeniu tego typu ciśnienie powietrza nie może być mniejsze niż 110 kPa i nie powinno przekraczać 175 kPa, ponieważ przy wyższych wartościach ciśnienia powietrza strumień objętości piasku i wody zaczynał maleć. Wartości strumienia objętości piasku i wody obliczone za pomocą wyprowadzonych wzorów bardzo dobrze pokrywały się (korelowały?) z wartościami wyznaczonymi w pomiarach bezpośrednich na modelu laboratoryjnym w skali 1:1.
Źródło:: Ochrona Środowiska; 2017, 39, 1; 45-52
1230-6169
Pojawia się w:: Ochrona Środowiska
Dostawca treści:: Biblioteka Nauki

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