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Wyświetlanie 1-10 z 4767
Tytuł:
Laboratory investigations on landing gear ground reactions (load) measurement
Autorzy:
Skorupka, Z.
Powiązania:
https://bibliotekanauki.pl/articles/243799.pdf
Data publikacji:
2017
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
laboratory-testing
landing gear
load measurement
direct measurement
indirect measurement
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.
Źródło:
Journal of KONES; 2017, 24, 2; 225-230
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An automatic system for measurement of impedance active component using a quasi-balanced method
Autorzy:
Barwinek, S.
Cichy, A.
Powiązania:
https://bibliotekanauki.pl/articles/114468.pdf
Data publikacji:
2015
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
virtual instruments
LabVIEW
capacitance measurement
impedance measurement
resistance measurement
phase shift measurement
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.
Źródło:
Measurement Automation Monitoring; 2015, 61, 5; 132-135
2450-2855
Pojawia się w:
Measurement Automation Monitoring
Dostawca treści:
Biblioteka Nauki
Artykuł
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
Powiązania:
https://bibliotekanauki.pl/articles/273576.pdf
Data publikacji:
2014
Wydawca:
Roble
Tematy:
metodyka pomiarów
niepewność pomiaru
błąd pomiaru
measurement methodology
measurement uncertainty
measurement error
Źródło:
LAB Laboratoria, Aparatura, Badania; 2014, 19, 5; 26-32, 35
1427-5619
Pojawia się w:
LAB Laboratoria, Aparatura, Badania
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A measurement system for children endurance tests
Autorzy:
Łuszczyk, M.
Rafiński, L.
Powiązania:
https://bibliotekanauki.pl/articles/376206.pdf
Data publikacji:
2012
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
children endurance test
noninvasive measurement modules
measurement system
Opis:
There are a lot of ethical problems concerning the use of invasive methods for the measurement of a child’s body response to physical exercise and physical training. The alternative is are non-invasive methods like ergospirometry or NIRS. The article presents a measurement system dedicated for children endurance tests, composed of a few non-invasive measurement modules, including a temperature measurement module. Temperature is one of the factors determining the hemoglobin oxygenation, which in turn determines the physical exercise ability. The system was tested on a group of 15 healthy children 14-16 years old partaking in a ramp exercise test up to exhaustion. The test results are shown in the article.
Źródło:
Poznan University of Technology Academic Journals. Electrical Engineering; 2012, 72; 57-64
1897-0737
Pojawia się w:
Poznan University of Technology Academic Journals. Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A proposal for perception measurement on a linguistic scale coded with unconventional fuzzy numbers
Autorzy:
Dziechciarz-Duda, Marta
Powiązania:
https://bibliotekanauki.pl/articles/1043907.pdf
Data publikacji:
2020-08-18
Wydawca:
Główny Urząd Statystyczny
Tematy:
measurement
measurement scale
measurement scale adequacy
Item Response Theory
the Rasch model
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.
Źródło:
Przegląd Statystyczny; 2020, 67, 1; 51-76
0033-2372
Pojawia się w:
Przegląd Statystyczny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Accuracy of soil moisture measurement by TDR technique
Autorzy:
Skierucha, W.
Powiązania:
https://bibliotekanauki.pl/articles/26205.pdf
Data publikacji:
2000
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
measurement error
measurement
time domain reflectometry
soil moisture
water content
Źródło:
International Agrophysics; 2000, 14, 4
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Automated Measurement System for Room Acoustics – an Initial Feasibility Study
Autorzy:
Borkowski, B.
Pluta, M.
Powiązania:
https://bibliotekanauki.pl/articles/176305.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
acoustic measurement
room acoustics
automated measurement system
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.
Źródło:
Archives of Acoustics; 2015, 40, 3; 419-428
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of the Accuracy of Uncertainty Noise Measurement
Autorzy:
Przysucha, B.
Batko, W.
Szeląg, A.
Powiązania:
https://bibliotekanauki.pl/articles/176813.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
acoustics
noise measurement
uncertainty in measurement
probability distribution
Opis:
The paper formulates some objections to the methods of evaluation of uncertainty in noise measurement which are presented in two standards: ISO 9612 (2009) and DIN 45641 (1990). In particular, it focuses on approximation of an equivalent sound level by a function which depends on the arithmetic average of sound levels. Depending on the nature of a random sample the exact value of the equivalent sound level may be significantly different from an approximate one, which might lead to erroneous estimation of the uncertainty of noise indicators. The article presents an analysis of this problem and the adequacy of the solution depending on the type of a random sample.
Źródło:
Archives of Acoustics; 2015, 40, 2; 183-189
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Measurement strategy as a determinant of the measurement uncertainty of an optical scanner
Autorzy:
Koteras, Robert
Wieczorowski, Michał
Znaniecki, Piotr
Swojak, Natalia
Powiązania:
https://bibliotekanauki.pl/articles/94194.pdf
Data publikacji:
2019
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
coordinate measuring machine
optical scanner
measurement strategy
accuracy of measurement
Opis:
The subject of the article is an attempt to determine the impact of the applied measurement strategy on the accuracy of the measurement result. This problem is particularly crucial when measuring large objects. In these cases, it is not always possible to provide ideal conditions for the submission of particular scans. It is necessary to adjust the strategy to specific imposed conditions defined by the geometry of the object and to the time frame of the measurement itself. With regard to the above, an attempt was made to carry out a series of accuracy studies testing the structural light scanner while measuring elements of overall dimensions greater than the measuring capacity of the scanner. At the same time, various potential measuring strategies were simulated in practical applications. Our studies were conducted using a pre-designed test template with a defined distribution pattern of reference points and geometrical elements. Moreover, in order to make an in-depth investigation of the issue, some trials were undertaken with the use of limiting parameters. That means the scanner had both an excess and shortage of information required for a correct assembly of scans. Those scopes were taken into consideration in the study in order to use the acquired knowledge in practical measuring applications. Furthermore, conclusions from the conducted studies indicate peaks and troughs of respective measuring strategies with special care for determining relationships among the used strategies and the measuring accuracy parameters.
Źródło:
Archives of Mechanical Technology and Materials; 2019, 39; 26-31
2450-9469
Pojawia się w:
Archives of Mechanical Technology and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Measurement accuracy verification of phasor measurement unit with dynamic phasor estimation
Autorzy:
Arendarski, B.
Rabe, S.
Heineken, W.
Komarnicki, P.
Powiązania:
https://bibliotekanauki.pl/articles/140719.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
discrete Fourier transform (DFT)
dynamic phasor
measurement accuracy
phasor measurement unit (PMU)
power system
Opis:
Power systems that are highly loaded, especially by a stochastic supply of renew- ables and the presence of storages, require dynamic measurements for their optimal control. Phasor measurement units (PMUs) can be used to capture electrical parameters of a power system. Standards on the PMU dynamic performance have been modified to incorporate their new dynamic mode of operation. This paper examines the PMU dynamic performance and proposes essential algorithms for measurement accuracy verification. Measurements of dynamic input signals, which vary in amplitude or frequency, were taken during au- tomated tests of two PMUs. The test results are presented and expounded with further recommendation for the performance requirements. This paper also presents and examines applied testing procedures with relevance to the specifications of the IEEE Standard for Synchrophasor C37.118.1™-2011 and its amendment C37.118.1a™-2014.
Źródło:
Archives of Electrical Engineering; 2018, 67, 3; 529--543
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-10 z 4767

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