Abstract In previous studies of linear rotary systems with active magnetic bearings, parametric excitation was introduced as an open-loop control strategy. The realized by a periodic, in-phase variation the bearing stiffness. At difference between two eigenfrequencies system, stabilizing effect, called anti-resonance, found numerically and validated in experiments. this work, preliminary result...

Abstract Piezoelectric (PZT) shunt damping is an effective method to dissipate energy from a vibrating structure; however, most of the applications focus on targeting specific modes for structures at low-frequency range, i.e. deterministic substructure (DS). To optimally attenuate high-frequency non-deterministic (Non-DS) using PZT damper, it found that impedance patch’s terminal needs be compl...

Abstract Parametric excitation in the pitch/roll degrees of freedom (DoFs) can induce dynamic instability floating cylinder-type structures such as spar buoys, offshore wind or wave energy converters. At certain frequency and amplitude ranges input waves, parametric coupling between heave DoFs results undesirable large rotational motion. One possible remedy to mitigate existence resonance is us...

In order to study the axial compression behavior of magnetically-driven concrete (MDC) filled double-skin GFRP tubes (CFDGT), test was conducted on eight columns (the length ranged from 1,000 mm 3,000 mm). For MDC, a magnetic vibration device established vibrate and two series MDC (concrete with without vibration) were adopted investigate effect, research results showed that between circular co...

The article presents a new technique to determine the optimal parameters of operating mode vibrating platform with modulated multi-parameter oscillations in technology compaction heavy and light concrete mixtures, based on intensity vibration exposure. Here is also design diagram laboratory equipment, designed generate multi-parametric. Scientifically substantiated conclusions are given about p...

A mesh-free method based on moving least squares approximation (MLS)  and weak form of governing equations including two dimensional equations of motion and Maxwell’s equation is used to analyze the free vibration of functionally graded piezoelectric material (FGPM) beams. Material properties in beam are determined using a power law distribution. Essential boundary conditions are imposed by the...