W artykule przedstawiono wyniki badań doświadczalnych wyznaczania współczynnika przewodzenia ciepła (?) gipsu. Podczas pomiarów wykorzystano metodę „gorącej nici”, która należy do jednej z najbardziej interesujących metod z powodu swojej prostoty, łatwości realizacji oraz dokładności. W pomiarach wykorzystano platynowy czujnik Pt100, który z układem pomiarowym tworzy precyzyjny przetwornik pomiaru temperatury z wyjściem napięciowym. Pomiary rejestrowano za pomocą komputerowego systemu pomiarowego z czasem próbkowania co 0,01 s.
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Results of experimental research have been presented in this article, determining the coeffi cient of thermal conductivity (λ) of gypsum. During measurements, a “hot wire” method was used, which belongs to the most interesting method because of its simplicity, easiness of realization and precision. Platinum Pt100 sensor was used during measurements, which both with measuring system creates precise temperature measuring converter with voltage output. Measurements were registered with the help of computer measuring system, with sampling time every 0.01 s.
In the present paper, an experimental setup for structural damping determination arising from energy dissipations within the material is presented. The experimental setup is developed in such a way that all unintended damping sources are eliminated. In this connection, priority is also given to the reproducibility of the experimental data. In addition, a vacuum chamber is developed to reduce the damping arising from the interaction with the surrounding medium. Furthermore, beam-shaped specimens are clamped in a suspended way, using screws with an apex to fix the specimens in their nodes of vibration. Then, the influence of test rig specific parameters on the damping value is analyzed. In this context, an ideal setup of the test rig is identified to measure structural damping values arising from dissipations within the material. Finally, a common model for material damping description is parameterized using the experimental data.
The article describes the measurements of power quality parameters of load which is mapping the lighting installation of LED sources. Study were performed on a specially constructed the experimental setup which allows for the measurement of electrical parameters and distortion from electroluminescent lighting. In the paper quoted the legal basis in the field of power quality, referring to the Standards: PN EN 50160 “Voltage characteristics of electricity supplied by public electricity networks” and PN–EN 61000 “Electromagnetic compatibility (EMC)”. Also has been presented a comparative study of LED light sources from various manufacturers, working individually and in a group. Shown the waveforms of current intensity and the bar graphs of higher harmonics of current. Additionally has been plotted the characteristics of total harmonic distortion ratio of current intensity THDi in the relation to the active power cooperating LED lamps. Finally the results of research has been analyzed and summarized.
The article describes the design, construction and research capabilities the experimental setup for measure the parameters of power quality of load which is mapping the lighting installation of LED sources. The standing has been build in order to study the disruption comes from the electroluminescent lighting mostly. The construction of standing also allows conducting the experimental research with the equipment which could improve the quality of electricity. In the paper quoted the concept of the power quality according to suggestion of Advisory Committee on Electromagnetic Compatibility (ACEC). Also has been presented the causes and consequences of exceeding the permissible values of power quality parameters. In the publication has been described the procedure for preparing and setting up the experimental setup for measuring the higher harmonics of current flowing through the tested LED lighting.
W pracy analizujemy charakterystyki stanowiska laboratoryjnego, będącego modelem elektryczno-hydrostatycznego napędu pojazdu. Podstawowymi zespołami tego stanowiska są: napęd elektryczny, napęd hydrostatyczny oraz bezwładnik odwzorowujący inercję pojazdu. Podstawowe charakterystyki stanowiska są wyznaczane oporami ruchu stanowiska oraz inercją wymienionych zespołów napędowych. Na podstawie dokumentacji technicznej stanowiska ustalono geometryczną postać elementów, które obracają się podczas ruchu stanowiska. Następnie przy użyciu programu do modelowania geometrycznego 3D ustalono masowe momenty bezwładności poszczególnych podzespołów stanowiska. Do wyznaczenia oporów ruchu użyto metodę swobodnego wybiegu bezwładnika. Metoda ta sprowadza się do rozpędzenia bezwładnika, a następnie do rejestracji jego prędkości kątowej, która zmniejsza się na skutek działania oporów ruchu działających na obracające się elementy stanowiska związane z bezwładnikiem. Na podstawie tego pomiaru oraz przyjętego modelu stanowiska zidentyfikowano postać funkcji, która opisuje moment oporów ruchu w zależności od prędkości kątowej bezwładnika.
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We present the characteristics of a laboratory setup, which has been built as a model of a vehicle electro-hydrostatic drive. The laboratory setup consists of three main parts: an electric drive, a hydrostatic drive and an inertia element which corresponds to the inertia of a vehicle. In order to determine the characteristics, we use the so-called free coasting method in which we measure angular velocity in time. The resistance torque reduces the angular velocity of rotating parts in time. On the basis of the technical documentation and using system Catia we have prepared 3D geometric models of the drive elements. In that way, we have been able to calculate their mass, moments of inertia and identify the relationship, which describes the motion resistance torque in the function of angular velocity.
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