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    Wyświetlanie 1-5 z 5
    Tytuł:
    Node Localization based on Anchor Placement using Fuzzy C-Means in a Wireless Sensor Network
    Autorzy:
    Irid, Sidi Mohammed Hadj
    Hadjila, Mourad
    Hachemi, Mohammed Hicham
    Souiki, Sihem
    Mosteghanemi, Reda
    Mostefai, Chaima
    Powiązania:
    https://bibliotekanauki.pl/articles/2200723.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    WSN
    localization algorithm
    anchors
    GM-SDP-2
    WLS
    CRLB
    Fuzzy C-Means
    RMSE
    CDF
    Opis:
    Localization is one of the oldest mathematical and technical problems that have been at the forefront of research and development for decades. In a wireless sensor network (WSN), nodes are not able to recognize their position. To solve this problem, studies have been done on algorithms to achieve accurate estimation of nodes in WSNs. In this paper, we present an improvement of a localization algorithm namely Gaussian mixture semi-definite programming (GM-SDP-2). GMSDP is based on the received signal strength (RSS) to achieve a maximum likelihood location estimator. The improvement lies in the placement of anchors through the Fuzzy C-Means clustering method where the cluster centers represent the anchors’ positions. The simulation of the algorithm is done in Matlab and is based on two evaluation metrics, namely normalized root-mean-squared error (RMSE) and cumulative distribution function (CDF). Simulation results show that our improved algorithm achieves better performance compared to those using a predetermined placement of anchors.
    Źródło:
    International Journal of Electronics and Telecommunications; 2023, 69, 1; 99--104
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Degrading systems availability analysis: analytical semi-Markov approach
    Autorzy:
    Kumar, Varun
    Kumar, Girish
    Singh, Rajesh Kumar
    Soni, Umang
    Powiązania:
    https://bibliotekanauki.pl/articles/1841831.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
    Tematy:
    availability
    perfect repair
    opportunistic maintenance
    Embedded Markov Chain (EMC)
    Cumulative Density Function (CDF)
    Semi-Markov Process (SMP)
    Opis:
    This paper deals with modeling and analysis of complex mechanical systems that deteriorate with age. As systems age, the questions on their availability and reliability start to surface. The system is believed to suffer from internal stochastic degradation mechanism that is described as a gradual and continuous process of performance deterioration. Therefore, it becomes difficult for maintenance engineer to model such system. Semi-Markov approach is proposed to analyze the degradation of complex mechanical systems. It involves constructing states corresponding to the system functionality status and constructing kernel matrix between the states. The construction of the transition matrix takes the failure rate and repair rate into account. Once the steady-state probability of the embedded Markov chain is computed, one can compute the steady-state solution and finally, the system availability. System models based on perfect repair without opportunistic and with opportunistic maintenance have been developed and the benefits of opportunistic maintenance are quantified in terms of increased system availability. The proposed methodology is demonstrated for a two-stage reciprocating air compressor with intercooler in between, system in series configuration.
    Źródło:
    Eksploatacja i Niezawodność; 2021, 23, 1; 195-208
    1507-2711
    Pojawia się w:
    Eksploatacja i Niezawodność
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Degrading systems availability analysis: analytical semi-Markov approach
    Autorzy:
    Kumar, Varun
    Kumar, Girish
    Singh, Rajesh Kumar
    Soni, Umang
    Powiązania:
    https://bibliotekanauki.pl/articles/1841749.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
    Tematy:
    availability
    perfect repair
    opportunistic maintenance
    embedded Markov chain
    EMC
    cumulative density function
    CDF
    semi-Markov process
    SMP
    Opis:
    This paper deals with modeling and analysis of complex mechanical systems that deteriorate with age. As systems age, the questions on their availability and reliability start to surface. The system is believed to suffer from internal stochastic degradation mechanism that is described as a gradual and continuous process of performance deterioration. Therefore, it becomes difficult for maintenance engineer to model such system. Semi-Markov approach is proposed to analyze the degradation of complex mechanical systems. It involves constructing states corresponding to the system functionality status and constructing kernel matrix between the states. The construction of the transition matrix takes the failure rate and repair rate into account. Once the steady-state probability of the embedded Markov chain is computed, one can compute the steady-state solution and finally, the system availability. System models based on perfect repair without opportunistic and with opportunistic maintenance have been developed and the benefits of opportunistic maintenance are quantified in terms of increased system availability. The proposed methodology is demonstrated for a two-stage reciprocating air compressor with intercooler in between, system in series configuration.
    Źródło:
    Eksploatacja i Niezawodność; 2021, 23, 1; 195-208
    1507-2711
    Pojawia się w:
    Eksploatacja i Niezawodność
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Free Vibrations of Uniform Timoshenko Beams on Pasternak Foundation Using Coupled Displacement Field Method
    Autorzy:
    Rajesh, K.
    Saheb, K. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/140207.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    free vibrations
    coupled displacement field method
    uniform Timoshenko beam
    Pasternak foundation
    drgania swobodne
    metoda CDF
    jednolita belka Timoshenko
    podłoże Pasternaka
    Opis:
    Complex structures used in various engineering applications are made up of simple structural members like beams, plates and shells. The fundamental frequency is absolutely essential in determining the response of these structural elements subjected to the dynamic loads. However, for short beams, one has to consider the effect of shear deformation and rotary inertia in order to evaluate their fundamental linear frequencies. In this paper, the authors developed a Coupled Displacement Field method where the number of undetermined coefficients 2n existing in the classical Rayleigh-Ritz method are reduced to n, which significantly simplifies the procedure to obtain the analytical solution. This is accomplished by using a coupling equation derived from the static equilibrium of the shear flexible structural element. In this paper, the free vibration behaviour in terms of slenderness ratio and foundation parameters have been derived for the most practically used shear flexible uniform Timoshenko Hinged-Hinged, Clamped-Clamped beams resting on Pasternak foundation. The findings obtained by the present Coupled Displacement Field Method are compared with the existing literature wherever possible and the agreement is good.
    Źródło:
    Archive of Mechanical Engineering; 2017, LXIV, 3; 359-373
    0004-0738
    Pojawia się w:
    Archive of Mechanical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Large amplitude free vibration analysis of tapered timoshenko hinged-hinged beam using coupled displacement field method
    Autorzy:
    Korabathina, R.
    Koppanati, M. S.
    Powiązania:
    https://bibliotekanauki.pl/articles/127704.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Poznańska. Instytut Mechaniki Stosowanej
    Tematy:
    large amplitude free vibrations
    coupled displacement field method
    tapered Timoshenko beams
    slenderness ratio
    taper ratio
    drgania swobodne
    metoda CDF
    belka Timoshenki
    belka stożkowa
    współczynnik smukłości
    współczynnik stożkowatości
    Opis:
    Tapered beams are more efficient compared to uniform beams as they provide a better distribution of mass and strength and also meet special functional requirements in many engineering applications like architecture, aeronautical, civil, mechanical, automobile, nuclear and robotics. The authors proposed a new method called Coupled Displacement Field (CDF) method in which the displacement field such as total rotation is assumed such that the assumed displacement must satisfy the kinematic and force boundary condition of the beam. The lateral transverse displacement is derived from the coupling equation which is derived from the static equilibrium conditions of the beam. By the application of principle of minimum total potential energy for different beam boundary conditions, the fundamental frequency parameter value is calculated in terms of taper ratio and slenderness ratio for various maximum amplitude ratios of the tapered Timoshenko shear flexible hinged-hinged beam boundary condition.
    Źródło:
    Vibrations in Physical Systems; 2017, 28; 1-11
    0860-6897
    Pojawia się w:
    Vibrations in Physical Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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