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A new hybrid Laplace transform/finite element method is proposed to solve the equations governing the vibrations of a string with time-varying length and a weight attached at one end. A set of… (More)
Abstract This paper presents the vibration analysis and suppression control of a moving elevator string. A dynamic formulation is proposed first for the non-linear vibrations of the string with… (More)
Abstract Non-linear vibrations of a cantilever piezoelectric beam in contact with a fixed disk are studied in this paper. The piezoelectric beam is excited to produce mechanical longitudinal… (More)
Abstract A new hybrid Laplace transform/finite element method is proposed to solve the dynamic problem of a bimodal ultrasonic motor, which used a piezoelectric beam to drive the rotor. Two modes,… (More)