Wyniki wyszukiwania - Biblioteka Nauki

1

Rekonstrukcja parametrów ruchu samochodu w trakcie prostoliniowego hamowania z wykorzystaniem wyników badań eksperymentalnych

100%

Guzek M. , Maniowski M. , Pieniążek W.

Zeszyty Instytutu Pojazdów / Politechnika Warszawska

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2005

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tom z. 2/57

45--58

PL

W pracy przedstawiono wyniki badań dotyczących oceny dokładności rekonstrukcji parametrów prostoliniowego hamowania samochodu osobowego (prędkości początkowej, opóźnienia, drogi hamowania) uzyskanych na podstawie zapisów tzw. samochodowych "czarnych skrzynek". Ocena została przeprowadzona przy wykorzystaniu wyników prób drogowych. Pokazano wyniki analizy, w której uwzględniono dwa rodzaje urządzeń rejestrujących, instalowanych w samochodach, różniących się liczbą rejestrowanych wielkości opisujących ruch pojazdu. Pierwsze, odpowiada standardowym urządzeniom stosowanym w lotnictwie, rejestruje trzy składowe przyśpieszenia liniowego (wzdłużne, poprzeczne i pionowe) oraz trzy kąty orientacji nadwozia: odchylenia, przechyłu wzdłużnego oraz bocznego. Drugie, odpowiada typowym rozwiązaniom stosowanym obecnie w motoryzacji. Rejestruje tylko dwie składowe przyspieszenia pojazdu (wzdłużne i poprzeczne) ipraz kąt odchylenia.

EN

In this paper the results of estimation of reconstruction`s accuracy of vehicle motion based on car "black-box" records (i.e. initial velocity, deceleration, braking distance) is presented. This evaluation has been realised on the basis of road tests. Results of analysis are compared to two types of "black boxes" applied in motorization. The first one records 3 car body acceleration components (longitudinal, lateral and "vertical") and 3 car body angles or angular velocities (yaw, pitch and roll). The second one omits "vertical" acceleration and pitch and roll angles (or angular velocities) recording. At the present time the second type of "black box" is typical device in motorization. In the paper some examples of results (time histories, braking distance and initial speed) obtained for passenger car are presented.

2

Badania teoretyczne i eksperymentalne nad wpływem parametrów powietrza na efekty owiewowego zamrażania produktów

100%

Kozioł J. , Gazda W.

Chłodnictwo : organ Naczelnej Organizacji Technicznej

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2002

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tom R. 37, nr 9

4-9

PL

Przedstawiono wyniki obliczeń numerycznych wpływu prędkości i temperatury powietrza na ususzkę (ubytek masy) podczas owiewowego zamrażania mięsa wołowego. Przeprowadzono badania ekspery-mentalne wpływu prędkości i temperatury powietrza na rozkład temperatury w przekroju poprzecznym, temperaturę krioskopową oraz ususzkę substancji imitującej produkty spożywcze. Badania przeprowadzono na wodnym roztworze glikocelu. Wykorzystano do tego celu stanowisko badawcze umożliwiające stabilizację temperatury i prędkości przepływu powietrza podczas prób. Stwierdzono występowanie określonych zakresów prędkości, dla których ususzka produktów jest szczególnie duża.

EN

This paper presents results of numerical calculations concerning influence of air temperature and veloc-ity on shrinkage (mass loss) during air blast freezing of beef meat. Experimental tests have been carried out on the influence of air temperature and velocity on cross-section temperature distribution and cryoscope temperature as well as shrinkage in a food-imitating substance. The experiments have been carried out on glycocel water solution in conditions where it was possible to stabilize temperature as well as air flow velocity during the tests. Certain velocity ranges for which product shrinkage is especially high have been observed.

3

Preliminary study of the Vacuum Packed Particles torsional damper

100%

Zalewski R. , Rodak D.

Journal of Theoretical and Applied Mechanics

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2021

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tom Vol. 59 nr 1

173--178

EN

The paper presents a prototype of an innovatory controllable torsional damper. The device is composed of Vacuum Packed Particles. Such structures are made of granular materials placed in a hermetic soft encapsulation. Generating so called underpressure inside the system changes global dissipative properties of the granular structure. The partial vacuum value is a convenient way to control physical properties of the granular structure. The authors introduce an original prototype of a torsional vibration attenuator. In the experimental part, preliminary experimental results are presented and discussed. To capture the real response of the device, a Bouc-Wen rheological model is adopted.

4

Boundary layer measurements in the pressure side leading edge region of an impulse turbine blade

100%

Cieplucha J. , Smolny A. , Bario F.

Zeszyty Naukowe. Cieplne Maszyny Przepływowe - Turbomachinery / Politechnika Łódzka

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1999

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tom nr 115

81--85

EN

This paper concerns experimental research using LDV laser anemometry technique developed in Ecole Centrale de Lyon . The research work is relative to separated boundary layer on the pressure side of an impulse turbine blade. The large dimension of the blade (1.4m chord) permits detailed studies of the fundamental problems such as the behaviour of boundary layer separation bubble under different turbulent inlet conditions.

5

Kultura twórczych dyskusji. Komunikat z badań eksperymentalnych

100%

Okraj Z.

Kultura i Edukacja

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2014

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nr 1(101)

72-98

EN

The article presents the results of experimental research on the culture of creative thinking that consists of its: characteristics, purposes, contents, principles, forms, methods of discussions, and didactic means used to activate students’ creative thinking. The research has also allowed to learn how important in the process of stimulation of students’ creative thinking are such conditions as: atmosphere of discussion, appearance of critical expressions destroying ideas (“idea killers”), and moderators’ personality traits. The main results of the described cycle of creative discussion are: stimulation of students’ creative thinking, teaching students the culture of creative discussion and strategy of “attacking” problems by generating many various and original ideas to solve problems, increasing students’ awareness of their own potential of creativity, and obtaining the ability of discussing and cooperating in teams / groups.

6

The results of experimental research of the huller-polisher machine for grain

100%

Salo V. , Leschenko S.

Motrol. Motoryzacja i Energetyka Rolnictwa

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2015

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tom 17

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nr 7

7

Thermogravimetric studies of exotic woods in oxidative environment

100%

Jaskolowski W. , Szajewska A.

Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology

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2015

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tom 92

8

Wpływ metody generowania poziomów czynników wejściowych na jakość inteligentnych planów eksperymentu

100%

Skowronek A.

Czasopismo Techniczne. Mechanika

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2011

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tom R. 108, z. 4-M/2

481-488

PL

Artykuł przedstawia wyniki symulacji komputerowej wpływu metody generowania wartości czynników wejściowych na jakość inteligentnych planów eksperymentu. Plany te generowane są komputerowo z zastosowaniem liczb pseudolosowych oraz odpowiednich parametrów generowania i analizowane za pomocą tzw. analizy ekwipartycyjnej.

EN

The paper shows the results of computer simulation the input's levels method's influence on smart designs of experiment's quality. Smart designs are generated in a special computer program with application of psudo-random numbers, special parameters of generation and verified in equipartitional analysis.

9

Nowe obszary zastosowań i nowe metody eksperymentalne w dziedzinie mechaniki ciała stałego

100%

Stupnicki J.

Zeszyty Naukowe Katedry Mechaniki Stosowanej / Politechnika Śląska

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1999

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tom z. 10

279-283

PL

Obserwowane obecnie coraz szersze stosowanie metod eksperymentalnych w mechanice ciała stałego, jest spowodowane osiągnięciem granicy możliwości korzystania z modeli liniowych, jak również pojawiającą się koniecznością obserwacji nowych zjawisk i nowych procesów. Przyczynił się do tego również, szybki rozwój metod eksperymentalnych, dzięki zastosowaniu technik do niedawna stosowanych jedynie w laboratoriach fizyków. Ponadto pojawiły się nowe możliwości stworzone przez zastosowanie komputerów do zbierania i przetwarzania danych.

EN

Widespread application of experimental methods observed nowadays has more emerged as a result of the limits being reached by the linear approaches, together with the necessity for new states and processes to be observed. On the other hand, it should be noted that experimental methods have been developed rapidly for the last decade due to application of the techniques used until now m physical laboratories only, revealing new capabilities emerging from advanced computer methods of data acquisition and data processing.

10

Research on the effectiveness of the innovative protective structure for vehicles

100%

Borkowski W. , Rybak P. , Hryciów Z. , Starczewski L. , Gmitrzuk M. , Szcześniak K.

Journal of KONES

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2015

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tom Vol. 22, No. 1

29--36

EN

This article presents results of the research on developed innovative protective structure for vehicles. The fundamental objective of executed work was to check the correctness of assumed assumptions, shape and geometry of the solution and configuration of components that affect the protective effectiveness during the impact of the explosive. In order to reach that goal, both model tests and experimental tests were carried out. The experimental tests were carried out on the real object. Significant information about the level, directions and nature of affecting dynamic loads were obtained as well as information about their impact on particular structure elements. The MES numerical model of the research object has been developed in LS-Dyna system. Special emphasis was placed on the mapping of complex geometry, configuration of components and their interactions. Test calculations were carried out and then the resistance calculations were made. As a load, generating post-explosion impact wave, the load imposed by normative requirements concerning the way of explosive arrangement as well as the shape and weight. The analysis of obtained results of the experimental and numerical tests allows for high evaluation of effectiveness of proposed solution.

11

Aerodynamic Research on the Midsection of a Long Turbine Blade

100%

Šimurda D. , Luxa M. , Šafařík P. , Synáč J.

TASK Quarterly : scientific bulletin of Academic Computer Centre in Gdansk

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2008

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tom Vol. 12, No 3-4

135-145

EN

The paper is concerned with experimental aerodynamic research on the midsection of a 1220mm long turbine rotor blade. Optical as well as pneumatic measurements of the midsection blade cascade have been performed in a suction type high-speed wind tunnel. The results of measurements are analyzed and discussed. Interferograms and schlieren pictures taken in a wide range of isentropic exit Mach numbers and incidence angles exhibit the existence of several phenomena occurring in the transonic flow field at certain conditions concerning the exit Mach number and the angle of incidence. A flow separation taking place at an extreme negative incidence has been found to produce an additional loss of 6%. The presence of the reflection of an exit shock wave on the suction side of the neighbouring profile has been found to have a substantial influence on the losses, since the loss coefficient value has increased about 10% in cases without the reflection, i.e. the cases at a high exit Mach number and a high positive angle of incidence. Several reflection types have been observed and described.

12

Badania wpływu usytuowania dystrybutora na zawartość gazu zatrzymanego w cieczy w reaktorze typu air-lift

100%

Karcz J. , Szoplik J. , Major M. , Rogozińska I.

Prace Wydziału Inżynierii Chemicznej i Procesowej Politechniki Warszawskiej

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2000

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tom Vol. 26, z. 2

79-87

PL

Przeprowadzono doświadczalne badania wpływu usytuowania dystrybutora na zawartość gazu zatrzymanego w cieczy w reaktorze typu air-lift z wewnętrzną cyrkulacją. Dystrybutory gazu miały kształt pierścienia lub dyszy i były umieszczone w odległości h od dolnej krawędzi rury wewnętrznej. Pomiary wykonano dla wody destylowanej i wodnego roztworu CMC. W zakresie przeprowadzonych badań stwierdzono, że wpływ parametru ho/(delta)h na średni udział (phi) powietrza zatrzymanego w cieczy jest niewielki.

EN

Experimental studies of the effect of the position of the sparger on the gaś hold-up (p in an intemal-loop air-lift reactor were carried out. The spargers had the shape of a ring or nozzle and were located at a distance hy from the Iower edge of the inner pipe. The measurements were conducted for distilled water and an aqueous solution of CMC. In the range of the performed experiments, the studies of the parameter ho/ (delta)h on the mean gas hold-up (phi) in the liquid showed an insignificant effect.

13

Comparison of results of experimental research of flexible rod composite reinforced concrete structure with sheet steel framework

100%

Storozhenko L. , Murza S. , Beznigaev B. , Efimenko O.

Inżynieria Bezpieczeństwa Obiektów Antropogenicznych

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2016

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tom Nr 3

34--37

EN

The article shows the main results of experimental research flexible rod composite reinforced concrete structure with sheet steel framework. When conducting experimental studies of researched the peculiarities of constructions under load and nature loss bearing capacity composite reinforced concrete structure samples with external steel framework with steel plates depending on the eccentricity application of efforts. Common to all samples is that under load was hogging the long axis of the element. This led to an uneven distribution of longitudinal deformations in reinforcement sheet, and accordingly, the wrinkles were formed by the opposite direction of bending. The results showed that the compressed-noncentral elements as limiting load advisable to take two values: the first corresponds to the limit efforts to achieve the most intense fiber sheet reinforcing fluidity limits of steel; second – the moment destruction test sample in which there is intense curvature of the longitudinal axis.

14

Energy intensity of the electric vehicle

100%

Dziubiński M. , Drozd A. , Adamiec M. , Siemionek E.

Advances in Science and Technology. Research Journal

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2017

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tom Vol. 11, no 4

27--34

EN

Continuous energy intensity is a relationship between continuous energy intensity and energy intensity of movement. In the paper we proposed to analyze energy intensity of the movement, as the size specifying the power demand to the wheel drive and presented the balance of power of an electric car moving in the urban cycle. The object of the test was a hybrid vehicle with an internal combustion engine and electric motor. The measurements were carried out for 4 speeds and 2 driving profiles.

15

An analysis of an explosive shock wave impact onto military vehicles of contemporary warfare

100%

Saska P. , Krzystała E. , Mężyk A.

Journal of KONES

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2011

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tom Vol. 18, No. 1

515-524

EN

Landmines and improvised explosive devices (IED) are the basic weapon used by the rebels against the Coalition forces in Afghanistan and Iraq. It is estimated that about 50% of the casualties (wounded and killed) among the soldiers from the US and other countries participating in both conflicts are caused by explosive charge. Introduction of vehicles providing proper protection of the crew against an explosive shock wave generated by a detonation of mines and improvised explosive devices into the arsenal has become one of the priorities of modernization of armed forceps. The parameters critical to the emerging of a hazard for the surrounding includes the overpressure impulse and the shock wave overpressure. The problem of defining the parameters of an explosive shock wave generated after detonation of charges of various mass, shape and physical-chemical properties is a subject of studies at much scientific institution. The gained quantitative data are not, however, published in public reports, thus a need of performing one’s own experimental and numeric research arise. The goal of these studies is to find solutions increasing soldier’s safety at the battlefield. The paper presents an analysis of impact of a shock wave onto structures of military vehicle. Furthermore, methods of experimental definition of explosion shock wave parameters were presented and conclusions for the needs of further experimental-numerical studies were formulated.

16

Identification of thermo-mechanical properties of natural polymers with a hybrid method

100%

Malujda I. , Talaśka K.

Engineering Transactions

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2016

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tom Vol. 64, iss. 4

635--641

EN

This article presents the results of experimental research into beech wood shearing. The applied research methodology has made it possible to obtain average values of basic strength parameters of wood: ultimate strength, yield point and the Kirchhoff’s shear modulus. In order to investigate the phenomenon of wood damage resulting from shearing forces, the attempt has been made to use the hybrid method. It combines the advantages of experimental research with a detailed investigation of the phenomenon by means of FEM analysis. The wood shearing tests have been recreated in Abaqus software in order to identify the areas in wood specimens where damage stresses appear first. The article contains sample results of experimental and numerical research with their comparative evaluation.

17

The overview of construction and selected aspects of testing mounting frames of aircraft machine guns

100%

Abratowski P. , Krasoń W. , Barnat W. , Gnarowski W.

Zeszyty Naukowe / Wyższa Szkoła Oficerska Wojsk Lądowych im. gen. T. Kościuszki

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2017

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tom Nr 1

155--172

EN

The installation of a machine gun on board a helicopter requires designing the rigid and durable frame for mounting a machine gun. Additionally there should be considered the limit to the weight of the structure, which forces the payload of a helicopter. The paper presents the overview of frames for mounting firing positions as well as selected cases of strength tests. In most of them the attention in the description was paid to the frames created through the cooperation of the Institute of Aviation and Military Aviation Plant No. 1 in Łódź. The aspects of research on firing positions on the example of a selected frame are also discussed. Furthermore, there is presented the prototype of the mounting frame WLKM (multi-barreled aircraft machine gun) designed by the Institute of Aviation (in the co-operation with Zaklady Mechaniczne Tarnów) with some chosen results of the FEM analyses.

18

Badania nad słyszeniem absolutnym u dzieci w wieku wczesnoszkolnym

100%

Kozłowska-Lewna A.

Aspekty Muzyki

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2011

|

tom 1

101-122

EN

The author presents an overview of contemporary research in perfect pitch and the absolute method, discusses results of her survey on the importance of perfect pitch in musicians, and presents results of experimental activities stimulating perfect pitch in children at early school age. The aim of the experimental research was to answer the question of whether it was possible to effectively stimulate perfect pitch abilities in children at early school age. An experimental ear training program with the use of the absolute method was directed onto children in year one of music school. The effects of the stimulation were applied to two control groups trained by using the relative mFollowing the study, it was found that: perfect pitch can be shaped in a conscious way; the ability develops primarily in early childhood; the process of forming the capacity for absolute hearing begins with memorizing the seven standard pitches of the diatonic scale of C major. The research also confi rmed a high attractiveness of perfect pitch for professional musicians and proved that the ability to consciously stimulate the capacity for absolute hearing in children aged 7–8 years speaks for the use of the absolute method in the initial stage of studies in music schools.

19

Application of the multi-generating method to support the quality of smart designs of experiment

100%

Skowronek A.

Technical Transactions

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2017

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tom Vol. 9(114)

237--246

EN

The article presents a method used in the process of generating smart designs of experiment in a dedicated computer program with the application of pseudo-random numbers, the use of which may have a considerable impact on the quality of generated designs. In order to increase the probability of generating the optimal design for the defined parameters of generating, a special method was applied, in which several designs were generated and the best of them selected, based on the equipartitional analysis parameters. The results confirm a significant positive influence of the analyzed method on the smart design’s quality.

PL

Artykuł przedstawia metodę używaną w procesie generowania elastycznych planów eksperymentu w specjalnym programie komputerowym z zastosowaniem liczb pseudolosowych, których użycie może mieć znaczący wpływ na jakość planów. W celu zwiększenia prawdopodobieństwa wygenerowania planu optymalnego dla ustalonych parametr w generowania planu, zastosowano specjalną metodę, w której generowanych jest wiele planów i wybierany najlepszy na podstawie parametrów tzw. analizy ekwipartycyjnej. Uzyskane wyniki potwierdzają znaczący pozytywny wpływ metody na jakość elastycznych planów eksperymentu.

20

Studies on the supporting structure of the ”crossbow” rocket launcher in the aspect of improvement of its resistance properties

100%

Rybak P. , Borkowski W. , Hryciów Z. , Michałowski B. , Wiśniewski A. , Wysocki J.

Journal of KONES

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2013

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tom Vol. 20, No. 3

353--358

EN

This paper presents the results of the studies on a special vehicle Polaris Ranger 6×6 800 equipped with the ”Crossbow” antiaircraft rocket launcher, manufactured by TELESYSTEM-MESKO Sp z o. o. Implementation and Manufacture Centre. The supporting structure of the launcher made the main object of the analysis. The essential goal of that undertaking was to obtain a structure of resistance assuring reliable system operation in various conditions of use. In order to reach that goal, the experimental as well as the model tests have been performed on the launcher vehicle. The experimental tests were carried out during multi-variant rides on the paved roads and in the wilderness of significant level of unevenness. Significant information on the level, directions and nature of affecting dynamic loads and the effects of their influence on the vehicle elements. The analysis of obtained results also provided the data required for a development of a model of the object of the studies. A MES model of the object of the studies was prepared in the LS-DYNA system. A high pressure was put on modelling a complex chassis of the launcher and mutual reaction of assemblies and parts. A generalized issue on the own properties was solved – frequencies and associated forms of vibrations of own main assemblies were designated. Resistance calculations were carried out for assumed loads. In principle, loads imposed by normative requirements for a particular class of armament and military equipment were assumed. Loads resulting from potential conditions of use and installation on other carriers were also included. The tests were performed for various load variants. Sensitive elements of the chassis were modified and highly satisfying results were obtained. It gives a reason to think that the chassis is resistant to expected and difficult operation conditions and assures that the whole system will work reliably.