Temat: Measurement - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: An automatic system for measurement of impedance active component using a quasi-balanced method
Autorzy:: Barwinek, S.
Cichy, A.
Tematy:: virtual instruments
LabVIEW
capacitance measurement
impedance measurement
resistance measurement
phase shift measurement; Pokaż więcej
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Powiązania:: https://bibliotekanauki.pl/articles/114468.pdf Link otwiera się w nowym oknie
Opis:: The paper presents the idea of the possibility of implementing automatic virtual instrument using the quasi ˗ balanced method to measure the active component of impedance (resistance). The system is based on the structure of a non-bridge quasi-balanced circuit. The process of balancing is automatically performed. This meter has been built based on the data acquisition board NI USB-6251 from National Instruments and programming environment LabVIEW. Signal processing is made in an algorithmic way. The measurement of the phase angle is based on short-term Fourier transform. The results of preliminary experimental research are presented in the paper.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Laboratory investigations on landing gear ground reactions (load) measurement
Autorzy:: Skorupka, Z.
Tematy:: laboratory-testing
landing gear
load measurement
direct measurement
indirect measurement; Pokaż więcej
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Powiązania:: https://bibliotekanauki.pl/articles/243799.pdf Link otwiera się w nowym oknie
Opis:: Ground reaction measurement in landing gear laboratory tests is used in order to gain knowledge about loads transferred to the aircraft structure. Ground reaction level is defined during aircraft design phase and it is required not to exceed limit value in real construction. Load from landing affect directly strength of aircraft structure especially mounting points what translates both strength of aircraft structure especially mounting points what translates both on safety and weight of the final design. Meeting the safety requirements is crucial in aviation regulations conformity. Landing gear ground reactions evaluation is performed during laboratory tests in order to meet the compliance with the ground load requirements assumed in design phase. Proper test method is crucial to prove the actual load. One of the methods is landing gear dynamic drop test where landing forces are measured. Force measurement is made in several ways according to test stand construction and test object specifics. In this article, three methods are described due to author’s experience in landing gear tests. Proposed techniques cover two direct and one indirect force measurements. Direct approach is based on strain gauge measurement principle. One is a strain gauge plate fixed to the ground while the second one is based on strain gauges attached to landing gear mounting nodes. Indirect approach is based on the acceleration of the tested object, which by definition is correlated with the force applied to the structure. Obtained test results allow determining the kinetic energy absorbed by landing gear during drop test. In this article author also presented numerical integration of the time history data and compared them with simulation results in order to show equivalence of all three of the test methods and to prove correctness of the test initial conditions determination.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Metodyka wykonywania pomiarów oraz ocena niepewności i błędów pomiaru
Methods of measurement and evaluation of measurement uncertainty and error
Autorzy:: Bochentyn, B
Kusz, B
Tematy:: metodyka pomiarów
niepewność pomiaru
błąd pomiaru
measurement methodology
measurement uncertainty
measurement error; Pokaż więcej
Wydawca:: Roble
Powiązania:: https://bibliotekanauki.pl/articles/273576.pdf Link otwiera się w nowym oknie
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: A proposal for perception measurement on a linguistic scale coded with unconventional fuzzy numbers
Autorzy:: Dziechciarz-Duda, Marta
Tematy:: measurement
measurement scale
measurement scale adequacy
Item Response Theory
the Rasch model; Pokaż więcej
Wydawca:: Główny Urząd Statystyczny
Powiązania:: https://bibliotekanauki.pl/articles/1043907.pdf Link otwiera się w nowym oknie
Opis:: The aim of this paper is to formulate a new proposal for perception measurement on a linguistic scale coded with fuzzy numbers. Additionally, an attempt is made to show the assessment process of the adequacy of a linguistic scale. The basis for the proposal is the discussion of issues related to the ambiguity of the results of measurements made by means of a subjective type of measurement scales. The proposed assessment technique is relevant when the results of the measurement based on a linguistic scale are coded with numerical equivalents in the form of e.g. unconventional fuzzy numbers. The issue the subjective perception of the products' quality illustrates the objectivity level of measurement results. Subjective perception is measured with a specially designed IT tool allowing the respondent to determine all the characteristics of the resulting fuzzy numbers. The scale adequacy assessment tool is based on the Item Response Theory, and particulary so on the model devised by Georg Rasch. The measurement of socio-economic phenomena, including material and subjective wellbeing of households, the quality of households' durable goods, and the assessment of the quality of goods available on the market requires special tools. It seems that one of the most useful and powerful tools for the measurement of socio-economic phenomena is a linguistic scale. The problematic issue in the analysis presented in the paper is coding verbal terms with their numerical equivalents.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Automated Measurement System for Room Acoustics – an Initial Feasibility Study
Autorzy:: Borkowski, B.
Pluta, M.
Tematy:: acoustic measurement
room acoustics
automated measurement system; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/176305.pdf Link otwiera się w nowym oknie
Opis:: Currently used procedures in room acoustics measurements are not automated. Particularly in medium-sized and large areas they require a lot of time and intensive labour which directly translates into an increase in the measurement cost. Introduction of an automated system would increase efficiency of the measurements, and therefore could present both practical and scientific benefit. The paper presents initial feasibility study for designing a system that permits the measurement of selected acoustic parameters for any choice of three-dimensional grid of measurement points throughout the volume of the room. The system will utilize an autonomous probe attached to a blimp, and will be able to measure and analyze acoustic characteristics of the rooms. The article discusses the initial choices of the system elements, starting from the general idea, through the mechanical design and control procedures, the software that controls positioning and flying of the probe, up to the automation of the measurement procedure and its possible impact on the acoustic field.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Simultaneous measurement of two parameters by double current supplied bridge
Autorzy:: Idzkowski, A.
Makal, J.
Warsza, Z. L.
Tematy:: multivariable measurement circuits
bridge circuit
strain measurement; Pokaż więcej
Wydawca:: Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Powiązania:: https://bibliotekanauki.pl/articles/384411.pdf Link otwiera się w nowym oknie
Opis:: A four-terminal (4T) bridge-circuit, with two voltage outputs is presented. This circuit, named as double current bridge is supplied by two equal current sources connected in parallel to opposite arms (2J) or by one such source switched between those arms (2x1J). Two output voltages from bridge diagonals as functions of arm resistance increments in absolute and in relative units are given. Also the example of this bridge application is proposed. Signal conditioning formulas of two-parameter measurement on the example of strain and temperature are discussed in detail. Some results obtained with the use of this bridge-circuit are briefly described.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: An introduction of high-precise 3D measurement system and its applications
Autorzy:: Hashimoto, T.
Kaneko, M.
Rövid, A.
Isono, S.
Sone, T.
Baba, K.
Fukuda, A.
Aniya, M.
Naito, N.
Enomoto, H.
Skvarca, P.
Tematy:: Image measurement
3D measurement
Glacier observation; Pokaż więcej
Wydawca:: Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Powiązania:: https://bibliotekanauki.pl/articles/384331.pdf Link otwiera się w nowym oknie
Opis:: We have been studying the high-precision three-dimensional measurement system using cameras. In this paper, our system is verified, and its application is reported. The principle of our measurement system is based on the stereo measurement. In our system, reducing the quantization error by numerical processing can realize the highprecision 3D measurement at the long distance. This measurement system has many applications, such as industrial use, ITS, robotics, and many others. Our system has been applied on the observation of the glacier. The Perito Moreno glacier, which is our target, moves very fast and the moving speed is reported as about 2 m/day. Then, it is thought that the important information about the global warming can be obtained by observing this glacier. But, as the width of the glacier is several km, there were no reports of continuously observing the movement of the glacier in high accuracy. As a result, the unique observation results about the daily movement of the glacier were measured. The observation of the glacier flow was carried out for the third straight year. In this paper, the valuable results of the glacier observation and experimental results to verify the precision are discussed.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Present metrological standards in mathematical modeling procedures
Autorzy:: Twardowski, K.
Lewandowska-Śmierzchalska, J.
Przybyłowicz, J.
Tematy:: mathematical modeling
metrology
measurement error
measurement uncertainty; Pokaż więcej
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Powiązania:: https://bibliotekanauki.pl/articles/299201.pdf Link otwiera się w nowym oknie
Opis:: In the years 1993-1994 International Organization for Standardization (ISO) introduced to the metrology the fundamental changes of basic character, involving - in addition to the traditional concept of measurement error - the use of new fundamental term of uncertainty of measurement. In consequence, this has led to currently undisputed axiom of metrology, that the measurement result has a form of a section on dimensional axis. These rules of presenting measurable physical values should be reflected in the of practical procedures of mathematical modeling. Presented work relates to this particular problem. It discusses the principles of mathematical modeling together with the assessment of the results. Particular attention was paid to the identification of possible systematic errors (i.e. the load of model) and to estimating the uncertainty of the statistical and deterministic modeling.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Estimating the uncertainty of tensile strength measurement for a photocured material produced by additive manufacturing
Autorzy:: Adamczak, S.
Bochnia, J.
Kaczmarska, B.
Tematy:: static tensile test
measurement error
measurement uncertainty; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/221806.pdf Link otwiera się w nowym oknie
Opis:: The aim of this study was to estimate the measurement uncertainty for a material produced by additive manufacturing. The material investigated was FullCure 720 photocured resin, which was applied to fabricate tensile specimens with a Connex 350 3D printer based on PolyJet technology. The tensile strength of the specimens established through static tensile testing was used to determine the measurement uncertainty. There is a need for extensive research into the performance of model materials obtained via 3D printing as they have not been studied sufficiently like metal alloys or plastics, the most common structural materials. In this analysis, the measurement uncertainty was estimated using a larger number of samples than usual, i.e., thirty instead of typical ten. The results can be very useful to engineers who design models and finished products using this material. The investigations also show how wide the scatter of results is.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Road Fee Charging Systems in the Management of Transport Logistics
Autorzy:: Szkic-Czech, Ewa
Kruszyński, Michał
Tematy:: transport logistics
business information
measurement automation
measurement systems; Pokaż więcej
Wydawca:: Międzynarodowa Wyższa Szkoła Logistyki i Transportu
Powiązania:: https://bibliotekanauki.pl/articles/504369.pdf Link otwiera się w nowym oknie
Opis:: The article discusses the logistic utility of registration data of automated measuring systems in the practice of operational management of national roads, expressways and motorways, as well as the shaping of the quality of logistic services. The analysis of the key problem is presented in the article on the example of the automatic toll collection system viaTOLL, operating on the indicated roads. The publication draws attention to the key and extramural information character of data registered, stored and offered by specialized, automated record systems. He points to the multifaceted and simultaneous usefulness of this data to the organization and management of the scale of road logistics processes, regardless of the chief, specialized function assigned to a specific automated recording system involved in the recording of specific road incidents.
Dostawca treści:: Biblioteka Nauki

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