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    Tytuł:
    Influence of ideal and non-ideal excitation sources on the dynamics of a nonlinear vibro-impact system
    Autorzy:
    Moraes, F. H.
    Pontes, B. R. (jr)
    Silveira, M.
    Balthazar, J. M.
    Brasil, R. M. L. R. F.
    Powiązania:
    https://bibliotekanauki.pl/articles/281540.pdf
    Data publikacji:
    2013
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    vibro-impact system
    limited power supply
    non-ideal excitation
    Sommerfeld effect
    Opis:
    The objective of the present work is to analyze the dynamics of a vibro-impact system consisting of two blocks of different mass coupled by a spring with two stages. Two different types of excitation sources for the system are used in the analysis: the first is an ideal excitation in form of a harmonic force, and the second is a non-ideal excitation in form of a DC electric motor with limited power supply which has an unbalanced rotor. The control parameter for both situations is the excitation frequency of the system. The analysis includes time histories of displacements and velocities, phase portraits and diagrams of the displacement and frequency, used to show the Sommerfeld effect. For certain values of the parameters of the system, the motion is chaotic. The mathematical model of the system is used to obtain an insight to the global dynamics of the vibro-impact system. The model with a non-ideal excitation is more realistic, complete and complex than the model with the ideal excitation.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2013, 51, 3; 763-774
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Health behaviours in Scaffold use risk assessment model - SURAM
    Autorzy:
    Bojar, H.
    Silveira, F.
    Rebelo, M.
    Czarnocka, E.
    Czarnocki, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/2082952.pdf
    Data publikacji:
    2019
    Wydawca:
    Instytut Medycyny Wsi
    Tematy:
    health behaviours
    risk assessment
    work safety
    Opis:
    Introduction. Problems concerning occupational safety and health are commonly found in the construction industry, including falling materials, tools or people from a height, stepping on objects, and injuries caused by hand tools. An important factor in occupational safety in the construction industry is the use of scaffolds. All scaffolds used in construction, renovation, repair (including isolating, painting and decorating) and demolition, should be erected, maintained and dismantledin accordance with safety procedures. Therefore, it is crucial to deal with the safety of scaffolds and risk assessment in the construction industry; thus, the way of undertaking the assessment and the liability of assessment seems to be essential for professionals. However, it has been found that those professionals are prone to rely heavily on their own experience and knowledge in decision-making regarding risk assessment. Materials and method. The Scaffold Use Risk Assessment Model (SURAM) has been developed for assessing risk levels at various stages of the construction process in various work trades. The SURAM is the result of a research project carried out at 60 construction sites in Poland and Portugal where 504 observations have been completed including both harmful physical and chemical factors, stress level, workers’ habits, as well as a hundreds ex-post reconstruction of construction accidents scenarios. Results. It was found that the workers’ Health Behaviour Index (HBI) seems to be a more direct predictor for development of the unsafe chain of events leading to an accident than the workload, and concentration of harmful factors at the workplace. Conclusions. The developed HBI module of SURAM seems to be beneficial for predicting high-risk construction activities, and thus preventing the occurrence of accidents, based on a set of historical accident data.
    Źródło:
    Annals of Agricultural and Environmental Medicine; 2019, 26, 1; 138-142
    1232-1966
    Pojawia się w:
    Annals of Agricultural and Environmental Medicine
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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