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    Tytuł:
    Effectiveness of the active pneumatic suspension of the operator’s seat of the mobile machine in depend of the vibration reduction strategies
    Autorzy:
    Chwastek, S.
    Pobędza, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/244967.pdf
    Data publikacji:
    2018
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    unsprung mobile machines
    active vibration reduction
    controlled suspension seats
    pneumatic actuator
    Opis:
    Low speeds of heavy mobile machines combined with large inertia result in the excitation of low frequency vibrations. Dissipation of vibration energy in the case of unsprung machines is performed only through tires, which slightly reduces the intensity of vibrations. Effective reduction of vibrations of mobile machines is possible only with active or semi-active methods. In unsprung mobile machines, on the way of propagation of vibrations between the source of vibrations and the protected object (machine operator), are vibroisolation systems located. These are most often controlled seat suspensions. In the case of the active suspensions, it is necessary to provide external energy, e.g. in the form of compressed air. The compressed air has the advantage that it is generally available in working machines as the working fluid and has its environmentally friendly properties (leaks do not contaminate the environment). This article is the result of the continuation of work on active methods of vibro-activity lowering in mobile machines, which resulted in, among others, elaboration of simulation model of the active operator’s seat suspension with controlled pneumatic actuator and its experimental identification. In particular, it was verifying the effectiveness of the adopted solution made the identification the friction model and thermodynamic phenomena in the controlled pneumatic cylinder. The aim of this work is parametric optimization of the suspension system and searching for the optimal control strategy. Experimental tests were carried out under conditions of harmonic excitations, coming from the electromechanical vibration exciter with controllable pitch and frequency. Data acquisition system and control circuit of the proportional directional control valve, supplying compressed air to the actuator were implemented using MATLAB-Simulink Real-Time software.
    Źródło:
    Journal of KONES; 2018, 25, 4; 43-48
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effectiveness of the active pneumatic suspension of the operator’s seat of the mobile machine in depend of the vibration reduction strategies
    Autorzy:
    Chwastek, S.
    Pobędza, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/245957.pdf
    Data publikacji:
    2018
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    unsprung mobile machines
    active vibration reduction
    controlled suspension seats
    pneumatic actuator
    Opis:
    Low speeds of heavy mobile machines combined with large inertia result in the excitation of low frequency vibrations. Dissipation of vibration energy in the case of unsprung machines is performed only through tires, which slightly reduces the intensity of vibrations. Effective reduction of vibrations of mobile machines is possible only with active or semi-active methods. In unsprung mobile machines, on the way of propagation of vibrations between the source of vibrations and the protected object (machine operator), are vibroisolation systems located. These are most often controlled seat suspensions. In the case of the active suspensions, it is necessary to provide external energy, e.g. in the form of compressed air. The compressed air has the advantage that it is generally available in working machines as the working fluid and has its environmentally friendly properties (leaks do not contaminate the environment). This article is the result of the continuation of work on active methods of vibro-activity lowering in mobile machines, which resulted in, among others, elaboration of simulation model of the active operator’s seat suspension with controlled pneumatic actuator and its experimental identification. In particular, it was verifying the effectiveness of the adopted solution made the identification the friction model and thermodynamic phenomena in the controlled pneumatic cylinder. The aim of this work is parametric optimization of the suspension system and searching for the optimal control strategy. Experimental tests were carried out under conditions of harmonic excitations, coming from the electromechanical vibration exciter with controllable pitch and frequency. Data acquisition system and control circuit of the proportional directional control valve, supplying compressed air to the actuator were implemented using MATLAB-Simulink Real-Time software.
    Źródło:
    Journal of KONES; 2018, 25, 3; 93-98
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Semiactive vibration reduction of operator’s seat with the use of controlled magnetorheological damper
    Autorzy:
    Chwastek, S.
    Kozioł, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/241873.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    seats suspensions
    mobile machines
    magnetorheological damper
    semi-active methods
    controlled suspension
    reduction of vibration
    Opis:
    Low speeds of mobile heavy machines makes that the force derived from rough roads cause intense excitation of low frequency vibration, the reduction of which is possible only by active or semi active methods. In conditions of low frequency, the energy dissipation in the tire reduces the vibration intensity in a minor degree only magnetorheological dampers are free from this defect, which they properties changing under influence an electric field functioning on ferromagnetic particles of oil suspension. A controlling coil current, which is mounted in the damper piston, could control density of magnetic field lines (magnetic field intensity) directly in viscous hole of piston, and hence viscous drag force. Electric energy needed to control magnetorheological damper is generally available in each of mobile heavy machines. Simulation tests were performed to investigate effectiveness and stability of the proposed solution and the results were deemed satisfactory. The system was found to be feasible and implementable with respect to every parameter. The purpose of this study was to develop a simulation model of the semi active suspensions of operator’s seat based on magnetorheological damper, and to examine the effectiveness of using different control strategies.
    Źródło:
    Journal of KONES; 2015, 22, 4; 59-66
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Active vibration reduction operator’s seat with the use of controlled single-acting pneumatic actuator
    Autorzy:
    Chwastek, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/247371.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    mobile heavy machines
    unsprung vehicles
    active reduction of vibration
    controlled suspension seats
    pneumatic actuator
    Opis:
    Mobile heavy machines produce vibrations with low natural frequencies. Because they tend to ride at low speeds, excitations due to road roughness excite low frequency vibrations, which can be reduced by active or semi active methods only. Under conditions of low frequency vibrations, energy dissipation in tires will reduce the vibration intensity in a minor degree only. In the unsprung mobile machine vibration isolation system are provided between a vibration source and the protected object (operator) along the path of vibration propagation. Most machines are now equipped with controlled suspension seats. In the case of active suspensions, the external energy source is required, for instance in the form of compressed air. The compressed air has the advantage that it is generally available in heavy machines as the working fluid and is environmentally friendly. Simulation tests were carried out both in the time domain in Matlab-Simulink and in the frequency domain in the program Mathcad. Simulation tests were performed to investigate effectiveness and stability of the proposed solution and the results were deemed satisfactory. The system was found to be feasible and implementable with respect to every parameter. The first purpose of this study is to develop a simulation model of the active suspension of operator's seat based on an adjustable pneumatic actuator. The other purpose of this study is to examine the effectiveness of different control strategies.
    Źródło:
    Journal of KONES; 2015, 22, 3; 13-19
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modulation effect of vibration frequency of an unsprung heavy machine under the variable road adhesion conditions
    Autorzy:
    Chwastek, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/244951.pdf
    Data publikacji:
    2013
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    mobile heavy machines
    unsprung vehicles
    galloping effect
    adhesion factor
    slipping action
    frequency modulation of vibration
    Opis:
    Mobile heavy machines as unsprung vehicles exhibit low dissipation ability, hence the ride even at low speeds may give rise to intensive vibration. Particularly dangerous situations occur when the road wheels break away from the road surface due to the ’galloping’ effect, being the result of excited vertical and angular vibration of the machine frame in the vertical plane of symmetry. That implies a major restriction on the ride velocity, which negatively impacts on the machine performance. Vibrations thus produced are mostly in the low-frequency range and hence energy dissipation in tyres will reduce the vibration intensity in a minor degree only. The motion of tired wheels will always involve some slipping. While investigating the feasibility of increasing the efficiency of the vibration reduction systems, one ought to take into account the variable adhesion of road wheels due to different dynamic loading acting on the vehicle axles during the ride. Observations of unsprung machines during the ride suggest the occurrence of self-excited vibration. Mobile machines constitute dynamic systems, which can be governed by nonlinear, sometimes non-stationary differential equations of motion. Their stability also depends on intensity of external vibrations. This study investigates the motion of unsprung mobile machines, taking into account the dynamic processes in the driving system under the conditions of the variable adhesion of road wheels. The model of interaction between a tired wheel and the terrain takes into account the relationship between the road wheel adhesion factor and the slipping action. Mathcad supported by Matlab-Simulink and in the frequency domain – simulations in the time domain. The purpose of the simulation procedure was to find the causes of the vibration modulation frequency and determine the conditions triggering the occurrence of self-excited vibrations. Simulations are supported by the analysis of motion stability.
    Źródło:
    Journal of KONES; 2013, 20, 4; 55-62
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Innovative system for monitoring the tip over stability of mobile excavating machines on a tracked undercarriage
    Autorzy:
    Dudziński, Piotr
    Kosiara, Andrzej
    Powiązania:
    https://bibliotekanauki.pl/articles/2064380.pdf
    Data publikacji:
    2019
    Wydawca:
    STE GROUP
    Tematy:
    tip over stability
    operator assisting system
    monitoring system
    mobile excavating machines
    stabilność przechyłu
    system wspomagania operatora
    system monitorowania
    koparki mobilne
    Opis:
    The article points out that the operational safety of mobile excavating machines can be significantly improved by equipping them with on-board systems for tip over stability monitoring. Critical analysis has been conducted on tip over stability monitoring systems available on the market. Their capabilities and limitations have been analysed. The second part of the article presents an innovative concept of on-board systems for monitoring tip over stability in tracked excavating machines. This concept was developed to create a device that would allow the vehicle's tip over stability to be monitored with greater accuracy and reliability compared to current systems of this type. The article also presents a demonstrator and a simulation model of the developed device. The final part of the article presents exemplary results obtained in preliminary simulation tests of the developed system.
    Źródło:
    New Trends in Production Engineering; 2019, 2, 1; 104--111
    2545-2843
    Pojawia się w:
    New Trends in Production Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Spatial model of the unsprung wheeled machine’s dynamic system
    Autorzy:
    Chwastek, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/241952.pdf
    Data publikacji:
    2014
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    spatial model
    dynamic system
    mobile heavy machines
    unsprung vehicles
    "galloping" effect
    "snake meandering” effect
    adhesion factor
    slipping action
    vibration
    differential gear
    Opis:
    Mobile heavy machines as unsprung vehicles exhibit low dissipation ability, hence the ride even at low speeds may give rise to intensive vertical and angular vibration. Vibrations thus produced are mostly in the low-frequency range and hence energy dissipation in tires will reduce the vibration intensity in a minor degree only. Particularly dangerous situations occur when the road wheels break away from the road surface due to the ’galloping’ effect. Kinematic excitation acting on the wheels is mostly uncorrelated stochastic (random) processes, giving rise to the "snake meandering" effect. That implies a major restriction on the ride velocity, which negatively affects the machine performance. The motion of tired wheels will always involve certain slipping. While investigating the feasibility of increasing the efficiency of the vibration reduction systems, one ought to take into account the variable adhesion of road wheels due to different dynamic loading acting on the vehicle axles during the ride. This study investigates the motion of unsprung mobile machines, taking into account the dynamic processes in the driving system under the conditions of the variable adhesion of road wheels. The model of interaction between a tired wheel and the terrain takes into account the relationship between the road wheel adhesion factor and the slipping action, as well as the impacts of the differential gear on distribution of drive torque. The 3D (spatial) model of a backhoe loader is considered. It is a two-axle self-propelled machine on a wheeled chassis. The mathematical model constitutes nonlinear and non-stationary differential equations of motion. Their stability is therefore associated with vibration intensity. Simulations in the time domain were supported by Matlab-Simulink. The purpose of this study is to improve the safety features during the ride of mobile heavy machines, basing on the parametric optimization of the model.
    Źródło:
    Journal of KONES; 2014, 21, 2; 45-52
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wykrywanie uszkodzeń łożysk tocznych z wykorzystaniem sygnałów akustycznych rejestrowanych telefonem komórkowym
    Detection of rolling element bearing faults by means of acoustic signals recorded by a mobile phone
    Autorzy:
    Rzeszuciński, P.
    Orman, M.
    Pinto, C. T.
    Krishnamoorthi, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1201910.pdf
    Data publikacji:
    2016
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Napędów i Maszyn Elektrycznych Komel
    Tematy:
    maszyny elektryczne
    diagnostyka łożysk
    sygnał akustyczny
    telefon komórkowy
    electrical machines
    bearing diagnostics
    acoustic signal
    mobile phone
    Opis:
    According to statistics of the causes of electric machinery failures, bearings are at the very top of the list. Simultaneously the field of condition monitoring of rolling element bearings is a very mature branch of the more broad family of rotating machinery diagnostics. Many sophisticated systems have evolved over the past decades which allow to monitor the condition of bearings with a very high accuracy. Unfortunately, the business case of installing such, often costly system, in not always economically viable, especially when monitoring of the non-critical elements of the system is concerned and so the potential Return On Investment might be of critically low value. For this reason there is an ongoing endeavor to find the perfect balance between the cost of the condition monitoring activities and their efficiency. One of the mostly investigated areas these days is related to the onset of the very powerful and versatile portable devices e.g. mobile phones chich come instrumented with a very powerful CPUs and a number of sensors of different types. This text looks into the possibilities of utilizing the microphone embedded in a standard off-the-shelf mobile phone for the purpose of monitoring the condition of rolling element bearings. It turns out that the main challenge comes from the characteristic frequency response of the standard microphone which is mainly designed to transmit human voice, typically in the range above 200Hz. However the obtained results suggest that despite this limitation it is possible to detect the presence of typical faults in the rolling element bearings.
    Według statystyk traktujących o najczęstszych przyczynach awarii silników elektrycznych, łożyska toczne są najczęstszą przyczyną problemów. Jednocześnie dziedzina monitorowania stanu łożysk tocznych jest bardzo dojrzałą gałęzią dużo szerszego zagadnienia diagnostyki maszyn wirujących. W rezultacie wiele bardzo wydajnych systemów diagnostycznych pozwalających na monitorowanie stanu łożysk z bardzo dużą dokładnością zostało stworzonych w ostatnich dekadach. Niestety inwestycja w owe, często kosztowne systemy, nie zawsze jest ekonomicznie opłacalna, zwłaszcza gdy rozpatrywany jest monitoring nie krytycznych elementów systemu. To z kolei może prowadzić do potencjalnego zwrotu z inwestycji o krytycznie niskiej wartości. Ten stan rzeczy jest motywatorem działań mających na celu znalezienie idealnej równowagi pomiędzy kosztami przedsięwzięć skierowanych na monitorowanie stanu elementów łożyska, a ich efektywności. Jeden z obecnych trendów jest stricte powiązany z możliwościami bardzo wszechstronnych urządzeń przenośnych, na przykład telefonów komórkowych, które są wyposażone w mocne jednostki obliczeniowe oraz mają domyślnie wbudowanych wiele rodzajów sensorów. Ten tekst koncentruje się na możliwościach wykorzystania mikrofonu wbudowanego w standardowy telefon komórkowy do monitorowania stanu łożysk tocznych. Okazuje się, że głównym wyzwaniem jest charakterystyczna odpowiedź częstotliwościowa standardowego mikrofonu, który jest skonstruowany z myślą o transmisji ludzkiego głosu, a ten rzadko niesie ważne informacje w paśmie poniżej 200Hz. Jednakże uzyskane wyniki wskazują, że pomimo tego ograniczenia, jest możliwe wykrywanie obecności wad typowych dla łożysk tocznych.
    Źródło:
    Maszyny Elektryczne: zeszyty problemowe; 2016, 2, 110; 163-168
    0239-3646
    2084-5618
    Pojawia się w:
    Maszyny Elektryczne: zeszyty problemowe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A selection of the parameters of the energy potential of the impact executive bodies and the prediction of their resource
    O wyborze parametrów zabezpieczenia energetycznego uderzeniowych organów wykonawczych i prognozowaniu ich resursu
    Autorzy:
    Nordin, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/409640.pdf
    Data publikacji:
    2013
    Wydawca:
    STE GROUP
    Tematy:
    impact executive body
    multifactor models
    destruction
    strength properties
    resource forecasting
    mobile connections of knots of machines
    uderzeniowy organ wykonawczy
    modele wieloczynnikowe
    zniszczenie
    parametry wytrzymałościowe
    prognozowanie resursu
    połączenia ruchome elementów maszyn
    Opis:
    The article describes received by the author multifactorial models of fracture of materials according to the technological scheme typical for building and road machines. Analysis of the models allows to set a reasonable ratio between speed and mass impact energy components to their use in the design. The relationship was obtained to determine the reasonable value of operating voltages generated by the instrument, depending on the strength properties of a destroyed object. Using an expression to determine the speed of the striker with the well-known strength of a destroyed material, a formula was obtained for the prediction of the resource of mobile connections drums executive bodies.
    W artykule opisano otrzymane przez autora wieloczynnikowe modele niszczenia materiałów według schematu technologicznego, właściwego dla maszyn budowlanych i drogowych. Analiza modeli pozwala ustalać racjonalny stosunek pomiędzy prędkościowymi i masowymi komponentami energii udaru do ich wykorzystania w projektowaniu. Otrzymano zależności do określenia racjonalnych wartości naprężeń roboczych, generowanych w organach wykonawczych w zależności od parametrów wytrzymałości niszczonego obiektu. Wykorzystując wyrażenie do określenia prędkości bijaka przy znanej wytrzymałości niszczonego materiału, otrzymano wzór do prognozowania resursu połączeń ruchomych w organach wykonawczych.
    Źródło:
    Management Systems in Production Engineering; 2013, 2 (10); 19-22
    2299-0461
    Pojawia się w:
    Management Systems in Production Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Idea smart living – idea inteligentnego, mądrego stylu życia
    The idea smart living – the idea of an intelligent, wise lifestyle
    Autorzy:
    Furmanek, Waldemar
    Powiązania:
    https://bibliotekanauki.pl/articles/445955.pdf
    Data publikacji:
    2017
    Wydawca:
    Uniwersytet Rzeszowski
    Tematy:
    urządzenia inteligentne
    urządzenia mobilne
    życie rozumne
    paczkomaty
    pralkomaty
    smart
    smart device
    mobile devices
    smart living
    parcel machines
    washer mates
    Opis:
    Pojęcie smart bardzo się upowszechniło. To zaowocowało dążeniem do wykorzystania urzą-dzeń smart i urządzeń mobilnych. Konsekwencją są nowe postępowania ludzi odmienne od do-tychczas spotykanych. Kształtuje się nowy styl życia smart living. Ilustracją jest upowszechnienie smartfonów, paczkomatów, pralkomatów.
    The concept is very smart became widespread. This resulted in the desire to use smart devic-es and mobile devices. Consequence of the new procedure of people different from previously encountered. Shaping a new lifestyle smart living. An illustration is to promote smart-phon, parcel machines, washer mates.
    Źródło:
    Dydaktyka informatyki; 2017, (12)2017; 22-32
    2083-3156
    Pojawia się w:
    Dydaktyka informatyki
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-10 z 10

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