The stability of a piezoelectric structure controlled by digital vibration absorber emulating shunt circuit is investigated in this work. formalism feedback control theory used to demonstrate that systems with low electromechanical coupling are prone delay-induced instabilities entailed the sampling procedure unit. An explicit relation derived between effective factor and maximum period guarant...

Introduction: Many vibration transport and technological machines (VTTM) such as conveyors, screens, crushers, etc. operate in a high-frequency mode, or above resonance. Resonance occurs during machine start slowdown, resulting sharply rising values of the amplitude velocity oscillations. affects VTTMs adversely due to increased dynamic loads reducing machinery operating life reliability causin...

Abstract This article describes the effects of gravity on response systems identical, cyclically arranged, centrifugal pendulum vibration absorbers (CPVAs) fitted to a rotor spinning about vertical axis. CPVAs are passive devices composed movable masses suspended rotor, such that they reduce torsional vibrations at given engine order. Gravitational acting can be important for relatively low rot...

Whole body vibration (WBV) exposure is recognised as a risk factor to the high prevalence of spinal musculoskeletal disorders (MSDs) experienced by farmers. The purpose of this study was to identify self-reported predictors that could be used to develop statistical models for WBV exposure (expressed as A8rms and VDV) in farmers operating agricultural quad bikes. Data were collected in the field...

Two-wheeled robots are popular in transportation applications because of their high maneuverability. In this research, the oscillation attenuation performance control moment gyroscope (CMG) for two-wheeled robot was studied. The stored kinetic energy a CMG can offer weight and volume saving compared to conventional vibration absorbers. This is also more reactionless than other absorbers by tran...