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  • Pozycja
    Dynamics and control experimental laboratory
    (Wydawnictwo Politechniki Łódzkiej, 2006) Marynowski, Krzysztof; Stefański, Andrzej; Wojewoda, Jerzy; Jagiełło, Bogdan; Red. nauk. Wydziału: Wojewoda, Jerzy; Warmiński, Jerzy; Wiercigroch, Marian
    The book we are proud to present is the effect of many years of experience gathered during teaching the Dynamics and Control at the International Faculty of Engineering in Technical University in Łódź. Dynamics and control are usually two separate subjects in programs of technical studies. The third year of the course of Mechanical Engineering and Applied Computer Science is combined into a single subject. Our over ten years didactic experience shows it gives finally very good results. The manuał contains a set of instructions how to perform 14 laboratory exercises from various issues of dynamics and control. They contain wide theoretical background and already solved exercises helping to complete the given tasks. In fact, the book is intended for students of the third year, but all interested in solving the practical issues of dynamics and automatics also can use it. We appreciate the support extended to us by all our colleagues from the Division of Dynamics of the Technical University of Łódź and gratefully acknowledge the individual help given to us by Małgorzata Jóźwik for careful and proficient translating.
  • Pozycja
    Vibrational energy transfer via modulated impacts for percussive drilling
    (Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej, 2008) Wiercigroch, Marian; Krivtsov, Anton M.; Wojewoda, Jerzy
    In this paper, a new method of vibrational energy transfer from high- frequency low-amplitude to low-frequency high-amplitude mechanical vibrations is proposed and investigated, for the purpose of percussive drilling. The mechanism uses an impact loading comprised of two frequencies forming a beat which excites a structure tuned to the beat-frequency. This concept has been modelled and experimentally verified. It is postulated that the efficiency of this technique is strongly dependent on the strength of nonlinearity in the system. The vibrational energy transfer is significantly reduced for superharmonic responses of the system. Practical applications of this mechanism can been seen as new generation percussive drilling tools.