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    Wyświetlanie 1-12 z 12
    Tytuł:
    Saccadic eye movements and their influence on kinematics of several body segments in the elderly while standing
    Autorzy:
    Bizovska, Lucia
    Vagaja, Milena
    Mihalova, Diana
    Janura, Miroslav
    Powiązania:
    https://bibliotekanauki.pl/articles/306872.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    akcelerometr
    entropia
    pierwiastek kwadratowy
    accelerometer
    sample entropy
    root-mean-square
    Opis:
    It is well known that postural stability is influenced by visual stimuli. The influence of saccadic eye movement on postural control has been described, however, a specific response of different body segments has not been studied yet. Therefore, the aim of this study was to assess the effect of horizontal and vertical saccadic eye movements on postural stability with specific focus on upper trunk, lower trunk and lower limbs movement variability and complexity. Methods: Eighteen elderly participants (aged 70.3 ± 7.7 years) stood in bipedal stance in three visual conditions – horizontal saccades, vertical saccades and fixation. Accelerometers were attached to their lower back, sternum and shanks. Movement variability of each body segment was described by root-mean-square and sample entropy of acceleration. Results: The results of the present study revealed significant influence of saccadic eye movements on anterior-posterior and vertical shanks, and vertical lower trunk movement variability described by root-mean-square. Conclusions: The correlations between results of the observed segments showed segment-specific variability patterns but generalised complexity pattern.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2019, 21, 2; 121-126
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Vibration diagnostic of a friction process in slide bearings
    Diagnostyka drganiowa procesu tarcia w łożyskach ślizgowych
    Autorzy:
    Lepiarczyk, D.
    Gawędzki, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/190671.pdf
    Data publikacji:
    2018
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    slide bearing
    diagnostic
    RMS
    root mean square
    friction
    vibration
    łożysko ślizgowe
    diagnostyka
    tarcie
    drgania
    Opis:
    An analysis of the condition of technical objects is carried out by diagnostic systems, the purpose of which is to detect irregularities in their operation and to prevent damages. In slide bearings, it applies to the diagnostic of friction and thermal phenomena of mating friction pairs. Among many methods of bearing diagnostics, special attention should be paid to vibration diagnostic methods based on measurements of relative vibration parameters or on absolute vibration (displacement, velocity, or acceleration of vibration). Methods of the vibration diagnostic of bearings rely on periodic or continuous measurements of relative vibration parameters of the bearing housing in relation to the rotor (in the case of slide bearings the measurements of the bearing sleeve in relation to the shaft neck) or absolute vibration parameters of the bearing housing (i.e. the sleeve in the case of slide bearing). The article presents a method of vibration diagnostics of friction phenomena that occur during the operation of slide bearings under various lubrication and load conditions. There are presented methods of analysis and the interpretation of measurement data obtained as a result of the conducted slide bearing tests on the laboratory stand. A method for assessing a technical condition of the slide bearing friction pairs is proposed.
    Rozpoznanie stanu obiektów technicznych jest realizowane przez systemy diagnostyczne, których celem jest wykrywanie nieprawidłowości w ich działaniu i zapobieganiu uszkodzeniom. W łożyskach ślizgowych dotyczy to diagnostyki zjawisk tarciowych i cieplnych współpracujących węzłów tarcia. Wśród wielu metod diagnostyki łożysk na szczególną uwagę zasługują metody diagnostyki drganiowej, bazujące na pomiarach parametrów drgań względnych bądź drgań bezwzględnych (przemieszczenie, prędkość lub przyspieszenie drgań). Metody diagnostyki drganiowej stanu technicznego łożysk polegają na okresowych lub ciągłych pomiarach parametrów drgań względnych obudowy łożyska względem wirnika (w przypadku łożysk ślizgowych panewki łożyska względem czopa wału) bądź parametrów drgań bezwzględnych obudowy łożyska (czyli panewki w przypadku łożyska ślizgowego). W artykule przedstawiono metodę diagnostyki drganiowej zjawisk tarciowych, jakie zachodzą podczas pracy łożysk ślizgowych przy różnych warunkach smarowania i obciążenia. Przedstawiono metody analizy i interpretacji wyników pomiarów otrzymanych w wyniku przeprowadzonych badań łożyska ślizgowego na stanowisku laboratoryjnym. Zaproponowano metodę oceny stanu technicznego węzła tarcia łożyska ślizgowego.
    Źródło:
    Tribologia; 2018, 278, 2; 73-80
    0208-7774
    Pojawia się w:
    Tribologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Quantification of lower extremity physical exposures in various combinations of sit/stand time duration associated with sit-stand workstation
    Autorzy:
    Pei, Huining
    Yu, Suihuai
    Babski-Reeves, Kari
    Chu, Jianjie
    Qu, Min
    Tian, Baozhen
    Li, Wenhua
    Powiązania:
    https://bibliotekanauki.pl/articles/2164098.pdf
    Data publikacji:
    2017-05-16
    Wydawca:
    Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
    Tematy:
    electromyography
    ergonomic intervention
    perceived level of discomfort
    root mean square
    body mass index
    gender differences
    Opis:
    Background Sit-stand workstations are available for office work purposes but there is a dearth of quantitative evidence to state benefits for lower limb outcomes while using them. And there are no guidelines on what constitutes appropriate sit/stand time duration. The primary aim of this study has been to compare muscle activity and perceived discomfort in the lower extremity during various combinations of sit/stand time duration associated with a sit-stand workstation separately and to evaluate the effects of the sit-stand workstation on the lower extremity during the text entry task. Material and Methods During the 5 days, all participants completed a 2-h text entry task each day for various sit/stand time duration combinations as follows: 5/25 min, 10/20 min, 15/15 min, 20/10 min, 25/5 min. Lower extremity muscular exposure of 12 male and 13 female participants was collected at 8 sites by surface electromyography and body discomfort was calculated by a questionnaire under those 5 conditions. Results Results have demonstrated that lower extremity muscle activity has been significantly varied among the 5 sit/stand time duration groups. Perceived level of discomfort (PLD) has not differed significantly for 9 out of 10 body parts. Conclusions The muscle activity of the thigh region was influenced by sit/stand time duration significantly. Ergonomic exposures of lower extremity when using a sit-stand workstation were increased, particularly during the long time standing posture. Results indicate that body mass index (BMI) and gender were not significant factors in this study. Combination of sit/stand time duration 25/5 min appears to show positive effects on relief of muscle exposure of back of thigh in the shifts of sitting and standing work position. Med Pr 2017;68(3):315–327
    Źródło:
    Medycyna Pracy; 2017, 68, 3; 315-327
    0465-5893
    2353-1339
    Pojawia się w:
    Medycyna Pracy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Using artificial neural networks to predict the reference evapotranspiration
    Autorzy:
    Abo El-Magd, Amal
    Baraka, Shaimaa M.
    Eid, Samir F.M.
    Powiązania:
    https://bibliotekanauki.pl/articles/27312640.pdf
    Data publikacji:
    2023
    Wydawca:
    Instytut Technologiczno-Przyrodniczy
    Tematy:
    climate data
    ETo calculator
    feedforward artificial neural networks
    Penman-Monteith method
    reference evaporation
    root mean square error
    Opis:
    Artificial neural network models (ANNs) were used in this study to predict reference evapotranspiration (ETo) using climatic data from the meteorological station at the test station in Kafr El-Sheikh Governorate as inputs and reference evaporation values computed using the Penman-Monteith (PM) equation. These datasets were used to train and test seven different ANN models that included different combinations of the five diurnal meteorological variables used in this study, namely, maximum and minimum air temperature (Tmax and Tmin ), dew point temperature (Tdw), wind speed (u), and precipitation (P), how well artificial neural networks could predict ETo values. A feed-forward multi-layer artificial neural network was used as the optimization algorithm. Using the tansig transfer function, the final architected has a 6-5-1 structure with 6 neurons in the input layer, 5 neurons in the hidden layer, and 1 neuron in the output layer that corresponds to the reference evapotranspiration. The root mean square error (RMSE) of 0.1295 mm∙day -1 and the correlation coefficient (r) of 0.996 are estimated by artificial neural network ETo models. When fewer inputs are used, ETo values are affected. When three separate variables were employed, the RMSE test values were 0.379 and 0.411 mm∙day -1 and r values of 0.971 and 0.966, respectively, and when two input variables were used, the RMSE test was 0.595 mm∙day -1 and the r of 0.927. The study found that including the time indicator as an input to all groups increases the prediction of ETo values significantly, and that including the rain factor has no effect on network performance. Then, using the Penman-Monteith method to estimate the missing variables by using the ETo calculator the normalised root mean squared error (NRMSE) reached about 30% to predict ETo if all data except temperature is calculated, while the NRMSE reached about of 13.6% when used ANN to predict ETo using variables of temperature only.
    Źródło:
    Journal of Water and Land Development; 2023, 57; 1--8
    1429-7426
    2083-4535
    Pojawia się w:
    Journal of Water and Land Development
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Methods of Vessel Casualty Process Assessment
    Autorzy:
    Soliwoda, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/115963.pdf
    Data publikacji:
    2014
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    risk assessment
    Vessel Casualty
    Maritime Casualties
    Maritime Accidents
    Marine Incident, Catastrophe
    Root Mean Square Error (RMSE)
    Casualty Factors
    Opis:
    Maritime casualty is an event of considerable economic and social impact. For this reason, implemented the reporting systems of accidents at sea, and the Administration was obligated to establish a Commission of Maritime Accidents. On the basis of casualty analysis and reports are developed proposals preventing similar casualties in the future. However, there is no uniform evaluation system which check references of existing regulations and recommendations to the occurred casualties. This paper presents a method to evaluate the used methods of casualty prediction with respect to the real incident and catastrophe.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2014, 8, 2; 211-216
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Diagnostics of the function of pneumatic actuators using acoustic emission
    Diagnostyka działania siłowników pneumatycznych z wykorzystaniem Emisji Akustycznej
    Autorzy:
    Mazal, Pavel
    Mahmoud, Houssam
    Vlašic, František
    Powiązania:
    https://bibliotekanauki.pl/articles/107784.pdf
    Data publikacji:
    2019
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    Pneumatic cylinders
    Defects
    Leakage
    Acoustic Emission
    Root Mean Square
    badania ultradźwiękowe
    technika DGS
    czułość badania
    dokładność oceny
    złącza spawane
    Opis:
    This paper focuses on finding the diagnostic criteria that evaluate the pneumatic cylinder and detect the defects. Several undamaged cylinders were tested by acoustic emission before artificial defects were created in each one. The signals from the progress and retreat strokes were recorded and analysed into many parameters. The differences were identified by comparing the max root mean square from sensor A and the max root mean square from sensor B for one cycle in the retreat stroke. The damaged and undamaged cylinders were distinguished using the difference in energy values present in the signals of the two sensors in the retreat stroke. This paper is a continuation of a prior article and the extension of my work.
    Przedstawiona w opracowaniu analiza miała na celu określenie dokładności w systemie oceny stosowanym przy badaniu złączy spawanych metodą ultradźwiękową z zastosowaniem techniki DGS. Podjęto próbę wyznaczenia reflektora odniesienia DDSR jako funkcji grubości badanego materiału. Wyznaczony reflektor pozwolił na ocenę czułości reflektorów odniesienia przyjętych wg normy PN-EN ISO 17640.
    Źródło:
    Badania Nieniszczące i Diagnostyka; 2019, 4; 26-28
    2451-4462
    2543-7755
    Pojawia się w:
    Badania Nieniszczące i Diagnostyka
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of development tendencies of metrological technologies to control rangefinders of an electronic distance measurement instruments
    Autorzy:
    Burachek, Vsevolod
    Khomushko, Dmytro
    Tereshchuk, Oleksiy
    Kryachok, Sergíy
    Belenok, Vadim
    Powiązania:
    https://bibliotekanauki.pl/articles/43852820.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    kalibrowanie
    dalmierz
    błąd pomiaru odległości
    calibration
    rangefinder
    electronic distance measurement
    reference linear station
    root mean square
    error distance measurement
    Opis:
    The article analyses the development of metrological control technologies for electronic distance measurement rangefinders to determine their main characteristic of accuracy – the root mean square error of distance measurement. It is established that the current reference linear bases are reliable and serve as the main means of transmitting a unit of length from the standards to the working means of measuring length. The article describes the existing linear reference bases and specifies their accuracy and disadvantages. It is concluded that the disadvantages of linear reference bases are deprived of the reference linear bases built in special laboratories. They use distances measured by the differential method with laser interferometers as reference distances. The application of such technology allowed to automate the processes of measurements and calculations. There is development of fibre-optic linear bases, in which optical fibres of known length are used as model lines. The article offers a new technical solution – a combination of fiber-optic and interference linear bases, which allows to qualitatively improve the system of metrological support of laser rangefinders. This is achieved by having a fiber-optic unit, which allows you to create baselines of increased length, while ensuring small dimensions of the baseline, and relative interference base, which provides high accuracy of linear measurements and does not require calibration of the base with a precision rangefinder, which eliminates several difficulties associated with changes in the refractive index, makes measurements independent of the wavelength of the radiation source and almost independent of the ambient temperature.
    Źródło:
    Advances in Geodesy and Geoinformation; 2022, 71, 1; art. no. e13, 2022
    2720-7242
    Pojawia się w:
    Advances in Geodesy and Geoinformation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparative study of the parallel and angular electrical gripper for industrial applications
    Autorzy:
    Fotuhi, Mohammad Javad
    Bingul, Zafer
    Powiązania:
    https://bibliotekanauki.pl/articles/1837935.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
    Tematy:
    electrical lead screw-driven industrial gripper mechanism
    LSDIGM
    efficiency
    position root mean square error
    PRMSE
    parallel electrical gripper
    PEG
    angular electrical gripper
    AEG
    Opis:
    The aim of this paper is to study the position and power performances of an electrical lead screw-driven industrial gripper mechanism (LSDIGM). This work consists of designing and developing an electrical LSDIGM that has the potential to meet various demands in the automation industry and factories. The performances of both angular electrical gripper (AEG) and parallel electrical gripper (PEG) mechanisms were compared based on their position and power efficiency. The position efficiency of these electrical LSDIGM is computed from the position root mean square error (PRMSE) obtained from errors between the two measured positions (input incremental encoder and output linear encoder). In the experimental setup, a current sensor and a spring were employed to measure the current in the input of the system and the stiffness in the output of the system, respectively. The electrical power in the input of the electrical LSDIGM and the mechanical power in the output of the LSDIGMs were calculated using the current and the spring force, respectively. Finally, the power efficiency of these electrical LSDIGMs was examined and compared at different velocity circumstances.
    Źródło:
    Acta Mechanica et Automatica; 2021, 15, 2; 66-73
    1898-4088
    2300-5319
    Pojawia się w:
    Acta Mechanica et Automatica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Semi-Active Suspension Characteristics on the Driving Comfort
    Autorzy:
    Pečeliūnas, Robertas
    Powiązania:
    https://bibliotekanauki.pl/articles/102573.pdf
    Data publikacji:
    2020
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    driving comfort
    semi-active suspension
    steering wheel robot
    root mean square
    sinusoidal manoeuvre
    komfort jazdy
    półaktywne zawieszenie
    robot sterujący
    średnia kwadratowa
    manewr sinusoidalny
    Opis:
    The article analyzes the influence of modern-day vehicle suspension characteristics on the passenger’s comfort sensation. The cars with air suspension were selected for the experiments and the suspension was equipped with mode selection options – “Comfort” and “Sport” . A sinusoidal manoeuvre was ensured with a steering wheel rotation robot. The experimental tests were carried out by changing car suspension modes and wheel sizes. The experiments and data processing were carried out in accordance with the provisions of the ISO 2631–1 international standard. In the experimental test, the longitudinal and lateral acceleration projections captured by the sensor and roll rate of the vehicle were set to provide the most comfortable adjustment of the car suspension mode. After filtering the measured vertical acceleration values, the comfort sensation was expressed as the root mean square (RMS) of vibration acceleration value. After evaluating the passenger’s sense of comfort, a summary of the effect of the car suspension-driving mode was provided.
    Źródło:
    Advances in Science and Technology. Research Journal; 2020, 14, 1; 18-25
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wykorzystanie wartości skutecznej sygnału emisji akustycznej oraz metod sztucznej inteligencji do oceny zużycia ściernicy
    Use of acoustic emission signal rms value and artificial intelligence methods for grinding wheel wear evaluation
    Autorzy:
    Sutowski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/156469.pdf
    Data publikacji:
    2009
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    szlifowanie
    zużycie ściernicy
    emisja akustyczna
    wartość skuteczna
    sztuczna inteligencja
    logika rozmyta
    grinding
    grinding wheel wear
    acoustic emission (AE)
    root mean square
    artificial intelligence
    fuzzy logic
    Opis:
    W pracy przedstawiono propozycję oceny zużycia ściernic metodą pośrednią, opartą na analizie wartości skutecznej sygnału emisji akustycznej. Umiejętność podejmowania decyzji jest jednym z elementów wyróżniających inteligentne działanie, dlatego budowa systemu diagnostyki, który charakteryzowałby się takimi właściwościami wymaga użycia odpowiedniego narzędzia wykonawczego. Włączenie w układ monitorujący teorii zbiorów rozmytych, pozwoliło dokonać oszacowania stopnia stępienia czynnej powierzchni ściernicy i oceny jej okresu trwałości w trakcie procesu szlifowania.
    In the paper the indirect method of grinding wheel wear evaluation is presented. This method is based on analysis of the root-mean-square value of an acoustic emission signal (AE). Application of the acoustic emission signal as a measure of changes occurring in the grinding zone enables the indirect assessment of the process without its stopping. The ability to take a decision is one of the elements distinguishing intelligent activities. Design of a diagnostic system with such kind of abilities requires the use of an appropriate executive tool. The conditional attributes for an intelligent expert system were set basing on the analysis of the test results, and in particular on the grinding process output values. For individual attributes there were assumed appropriate limit values representing a sharp, average or strongly used grinding wheel not suitable for further work. As a criterion of wear there were assumed macro- and micro-changes in the active surface of the grinding wheel as well as the stress in te top layer of the workpiece. The methods of artificial intelligence were implemented in the system to ensure its correct operation. Fuzzy logic included in the monitoring system allowed estimating the degree of the grinding wheel active surface wear and its lifetime during flat surface grinding. The complete system of the grinding wheel wear control which takes into account the temporary cutting ability and the chosen quality criterion is just a conceptional solution. It is expected that this system can successfully be used for construction of monitoring units and control of machining process.
    Źródło:
    Pomiary Automatyka Kontrola; 2009, R. 55, nr 4, 4; 255-258
    0032-4140
    Pojawia się w:
    Pomiary Automatyka Kontrola
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Monolityczne układy konwerterów sigma-delta do pomiaru wartości skutecznej napięcia i ich porównanie ze scalonymi konwerterami klasycznymi
    The present monolithic sigma-delta converters for root-mean-square voltage measurement and their comparison to classic monolithic integrated RMS converters
    Autorzy:
    Korytkowski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/277296.pdf
    Data publikacji:
    2012
    Wydawca:
    Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
    Tematy:
    element monolityczny
    elektroniczny układ pomiarowy
    modulator sigma-delta
    pomiar wartości skutecznej napięcia
    monolithic element
    electronic measuring circuit
    sigma-delta modulator
    root-mean-square voltage measurement
    Opis:
    W pracy omówiono zasadę działania współczesnych monolitycznych układów konwerterów sigma-delta stosowanych do formowania analogowego sygnału pomiarowego o wartości skutecznej napięcia. Dokonano przeglądu właściwości monolitycznych układów konwerterów sigma-delta do pomiaru wartości skutecznej napięcia i porównano z właściwościami monolitycznych klasycznych konwerterów stosowanych do takich pomiarów. Istotnymi zaletami monolitycznych układów konwerterów sigma-delta do pomiaru wartości skutecznej są: duża dokładność formowania analogowego wyjściowego sygnału pomiarowego, bardzo mały pobór mocy na wejściu oraz szerokie pasmo częstotliwościowe mierzonego napięcia wejściowego.
    The monolithic sigma-delta converters are very useful for measurement root-mean-square time-varying voltage circuits. The fig. 1 shows converter block diagram, which got possibility to describe the mathematical function for calculation RMS value of input AC voltage. The fig. 2 shows block diagram of multiplier-divider circuit containing identical two controlled elements having the very same controlled amplification. In the fig. 3 is shown the circuit diagram of sigma-delta modulator and characteristic of comparator, which is a part of the modulator. According to fig. 3 was formulated equation (15) as the characteristic description of multiplier-divider circuits, which is the main element of sigma-delta true RMS converter for input voltage measurement. The part 3 of this paper describes the parameters review of monolithic RMS converters. The table 1 presents the parameter values of selected group RMS converters, which are delivered by several much known firms. The converters parameters analysis shows, that monolithic sigma-delta converters have very good qualities in the parameter field of accuracy, minimal signal power consumption and wide frequency band of input measurement signals.
    Źródło:
    Pomiary Automatyka Robotyka; 2012, 16, 7-8; 84-89
    1427-9126
    Pojawia się w:
    Pomiary Automatyka Robotyka
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Statistical analysis of gaz-3110 vehicles noise
    Autorzy:
    Pobedin, A.
    Kosov, O.
    Dolotov, A.
    Domolazov, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/246122.pdf
    Data publikacji:
    2009
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    vehicle
    statistics
    noise sources
    dimension
    mean-root square dispersion
    noise level
    regression equation
    engine rpm speed
    useful life
    Opis:
    This work presents the results of the statistical analysis of noise in several points of GAZ-3110 vehicles. There are also the dependences between the loudness of noise and speed of an engine or useful life of a car. It is difficult to confuse the noise of jet engine with reciprocating internal-combustion engine. Random factors also influence much the power level. Mechanism adjustment has its limits and so it can have different influence on its vibration and noise. Finally during the process of operation sliding surfaces do wear, screwed connections do loosen, other things happen and these lead to the changes in spectrum and level of noise. In this work we tried to evaluate the dispersion of GAZ-3110 vehicles noise levels according to the results of a coustic measurements in the immediate field of rondom acoustically active constructive assemblies. The range of noise loudness for the specific car model is defined at the level 20-25 dBA. The GAZ-3110 vehicles are characterized by the significant dispersion of noise level. The differences of noise level of individual cars are exceeding 20-25 dBA. vehicles noise considerably increases with the augmentation of useful life and rpm speed. The noisiest element of GAZ-3110 vehicles is internal combustion engine, then main gear even when first gear is operated.
    Źródło:
    Journal of KONES; 2009, 16, 1; 407-410
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-12 z 12

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