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    Wyświetlanie 1-8 z 8
    Tytuł:
    Application of ultrasonic distance sensors for measuring height as a tool in unmanned aerial vehicles with a stabilized position in the vertical plane
    Autorzy:
    Bilewski, M.
    Putynkowski, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/135446.pdf
    Data publikacji:
    2016
    Wydawca:
    Akademia Morska w Szczecinie. Wydawnictwo AMSz
    Tematy:
    UAV
    ultrasonic distance sensors
    height measurement
    arduino
    raspberry Pi
    netduino
    Opis:
    The paper presents a review of ultrasonic sensors. Attention is focused on the possibility of using such sensors to keep an unmanned aerial vehicle at a constant altitude above the surface. Such a task requires filtered and unfiltered signals, so that the ground level can be distinguished even when obstacles are present. Three selected sensors were tested. The possibility of connecting these sensors to external devices was also studied. The potential of the individual sensors and of a set of sensors is discussed. The study showed that the best solution is to use a set of three ultrasonic sensors. Alternatively, a sensor with both unfiltered and filtered measurement was proved to be an adequate option.
    Źródło:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2016, 46 (118); 17-21
    1733-8670
    2392-0378
    Pojawia się w:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A super depth of field height measurement based on local disparity
    Autorzy:
    Cui, L.
    Liu, Y.
    Yu, M.
    Jiang, G.
    Fan, S.
    Wang, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/173522.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    microscopes
    binocular vision
    local disparity map
    depth of field (DOF)
    height measurement
    Opis:
    A super depth of field height measurement method is proposed to measure the object height with the optical stereoscopic microscope. The quasi-Euclidean epipolar rectification algorithm is utilized on the original stereoimage to obtain rectified stereoimages and calibrate two camera parameters. Then, feature points are obtained by the SURF (speed up robust feature) algorithm and their corresponding disparities are calculated. The disparity-depth of field curve is fitted by combining the step height values of a stepper motor. Moreover, through local disparity value got from feature points on the object, the relative shift height is calculated through regression analysis. Finally, according to binocular vision geometry, the thickness of the object can be calculated. Experimental results show that the measurement error in Z direction is from 1.51% to 7.71%, which indicates that the proposed method is able to measure the height of a microobject beyond depth of field within a tolerant error.
    Źródło:
    Optica Applicata; 2015, 45, 2; 205-214
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zastosowanie układów programowalnych do obsługi modelu przenośnika taśmowego
    The use of programmable devices in handling the model of a conveyor
    Autorzy:
    Bargieł, K.
    Noga, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/268777.pdf
    Data publikacji:
    2012
    Wydawca:
    Politechnika Gdańska. Wydział Elektrotechniki i Automatyki
    Tematy:
    model przenośnika taśmowego
    układ programowalny
    FPGA
    detekcja kolorów
    pomiar wysokości
    model of the conveyor
    programmable system
    color detection
    measurement of height
    Opis:
    W artykule przedstawiono model przenośnika taśmowego, który został zbudowany w Katedrze Automatyki Okrętowej (KAO) Akademii Morskiej w Gdyni. Pozwala on na odczyt parametrów zarejestrowanych przez czujniki pomiaru wysokości transportowanych elementów oraz detekcji ich koloru w skali RGB. Model ten jest wykorzystywany w KAO jako stanowisko dydaktyczne, do nauki układów programowalnych, w laboratorium Techniki Cyfrowej.
    This paper presents a model of a conveyor belt, which was built in the Department of Ship Automation (KAO), in Gdynia Maritime University. It allows to read the parameters recorded by the sensors measure the amount of transported elements and their detection on an RGB color. This model is used in the KAO as a teaching station in the labora-tory of digital technology.
    Źródło:
    Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej; 2012, 31; 27-30
    1425-5766
    2353-1290
    Pojawia się w:
    Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The application of a Hybrid III anthropomorphic dummy in testing personal fall arrest equipment
    Autorzy:
    Baszczyński, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/114296.pdf
    Data publikacji:
    2016
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    anthropomorphic dummy
    fall from height
    pendulum motion
    measurement of mechanical parameters
    Opis:
    The paper deals with measurement of the mechanical parameters describing fall arrest by personal protective equipment in situations where the user collides with a vertical structure as a result of a swing movement. The process of swing fall arrest is characterized and the scope of tests needed to obtain a description of such events from the point of view of user safety is delineated. The paper also presents the developed test method and experimental stand incorporating a Hybrid III 50th Pedestrian ATD anthropomorphic dummy. Preliminary test results concerning acceleration, force, moment of force, and dummy deformation are discussed. The results indicate that the designed method and experimental stand are well suited for the purpose. It has also been found that swing falls pose a serious hazard to PPE users.
    Źródło:
    Measurement Automation Monitoring; 2016, 62, 12; 429-433
    2450-2855
    Pojawia się w:
    Measurement Automation Monitoring
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Neural network model for phase-height relationship of each image pixel in 3D shape measurement by machine vision
    Autorzy:
    Chung, B
    Powiązania:
    https://bibliotekanauki.pl/articles/173298.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    machine vision
    shape measurement
    fringe pattern projection
    phase-height relationship
    neural network
    Opis:
    In a three-dimensional measurement system based on a digital light processing projector and a camera, a height estimating function is very important. Sinusoidal fringe patterns of the projector are projected onto the object, and the phase of the measuring point is calculated from the camera image. Then, the height of the measuring point is inferred by the phase. The phase-to-height relationship is unique at each image point. However it is nonlinearly different according to the image coordinates. It is also difficult to obtain the geometrical model because of lens distortion. Even though some studies have been performed on neural network models to find the height from the phase and the related coordinates, the results are not good because of the complex relationship. Therefore, this paper proposes a hybrid method that combines a geometric analysis and a neural network model. The proposed method first finds the phase-to-height relationship from a geometric analysis for each image pixel, and then uses a neural network model to find the related parameters for the relationship. The experimental results show that the proposed method is superior to previous neural network methods.
    Źródło:
    Optica Applicata; 2014, 44, 4; 587-599
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Decadal variations in wave heights off Cape Kelba, Saaremaa Island, and their relationships with changes in wind climate
    Autorzy:
    Suursaar, U.
    Kullas, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/47497.pdf
    Data publikacji:
    2009
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    wave height
    decadal variation
    climate change
    wave parameter
    relationship
    Cape Kelba
    storm
    wind
    Saaremaa Island
    wave measurement
    Opis:
    Based on wind data from the Vilsandi meteorological station and a 5-month calibration measurement with a bottom-mounted Recording Doppler Current Profiler (RDCP), a semi-empirical hindcast of wave parameters near the quickly developing accumulative Kelba Spit is presented for the period 1966–2006. The significant wave heights with a gross mean value of 0.56 m exhibited some quasiperiodic cycles, with the last high stage in 1980–95 and a decreasing overall trend of −0.001 m per year. At the same time, both the frequency and intensity of high wave events showed rising trends, and the mean wave heights during winter (December to February) increased as well. As the study area has the longest fetches in westerly directions, the discussed tendencies in wave conditions are sensitive to regional changes in the wind climate and can be related to a decrease in the local average wind speed on the one hand, but an intensification of westerly winds, storm events and the wintertime NAO index on the other. The roughest wave storms on record were associated with prominent W-storms on 2 November 1969 and 9 January 2005; a few other extreme wind events (e.g. in 1967, 1999, 2001), however, did not yield equally prominent waves.
    Źródło:
    Oceanologia; 2009, 51, 1; 39-61
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optimization of machining parameters during end milling of super alloys using grey based taguchi method coupled with entropy measurement technique
    Autorzy:
    Sreenivasulu, Reddy
    Rao, Chalamalasetti Srinivasa
    Powiązania:
    https://bibliotekanauki.pl/articles/95277.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Koszalińska. Wydawnictwo Uczelniane
    Tematy:
    CNC end milling
    inconel 718 super alloy
    burr height
    surface roughness
    grey based Taguchi method
    entropy measurement
    frezowanie CNC
    superstop Inconel
    chropowatość powierzchni
    metoda Taguchi
    pomiary entropii
    Opis:
    High-quality products include those with better surface quality and texture, close dimensional tolerances and form accuracies at precise level, increase fatigue life and burr-free. Burr formation is one of the most common inevitable facts occurring in all material removal processes, reduces assembly and machined part quality. But, burr formation during milling is a more complex mechanism compare to remaining machining burrs and leads to numerous difficulties during the deburring process. To prevent this, one should optimize the combination of cutting parameters during machining itself. In order to build up a link between quality and productivity and to attain the same in the cost-effective way, the present work concentrate on multi objective optimization of CNC end milling process parameters. Multiple performance characteristics with respect to surface quality and performance index like assembly work have been put up, to assess an equivalent single quality index (called grey relational grade) has been optimized finally by Grey based Taguchi method. After that priority weight of individual quality and performance attributes has been estimated by entropy measurement technique on the basis of relative significance and check the feasibility of the proposed technique has been demonstrated in this context.
    Źródło:
    Journal of Mechanical and Energy Engineering; 2020, 4, 1; 47-56
    2544-0780
    2544-1671
    Pojawia się w:
    Journal of Mechanical and Energy Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Locking of Retractable Type Fall Arresters - Test Method and Stand
    Autorzy:
    Baszczyński, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/90097.pdf
    Data publikacji:
    2005
    Wydawca:
    Centralny Instytut Ochrony Pracy
    Tematy:
    personal protective equipment against falls from a height
    retractable type fall arresters
    locking test method
    measurement of acceleration signals
    praca na wysokości
    upadek z wysokości
    sprzęt przeciwupadkowy
    środki ochrony indywidualnej
    wypadki przy pracy
    Opis:
    Retractable type fall arresters are very effective personal equipment protecting against falls from a height. These devices are used under different atmospheric conditions and in the presence of various types of industrial pollution. For this reason appropriate locking after conditioning simulating extreme conditions of a worksite is one of the essential characteristics of retractable type fall arresters. This article presents the requirements for locking of the devices. A previously used locking test method and its disadvantages are discussed. The article suggests an improved test method and test equipment. Measurement of the test mass acceleration is the most important improvement introduced into the test method. The article shows laboratory tests used to verify the method, which turned out to be a valuable source of information concerning the performance of retractable type fall arresters.
    Źródło:
    International Journal of Occupational Safety and Ergonomics; 2005, 11, 2; 191-202
    1080-3548
    Pojawia się w:
    International Journal of Occupational Safety and Ergonomics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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