Combined Piezoelectric-Hydraulic Actuator Based Active Vibration Control for Rotordynamic System

Abstract

Previous research by the authors concentrated on using piezoelectric actuators for active vibration control (AVC) of rotating machinery. The current work extends this by positioning the piezo-actuator remotely from the controlled structure and transmitting the control force via a hydraulic line and two pistons. Liquid plastic (LP) is employed as a transmission “fluid” to obtain a high bulk modulus and low leakage. The paper presents results for bulk moduli measurement, and bench and rig tests for the entire actuator system. These results show the high effectiveness of the hybrid actuator for controlling vibrations on a laboratory rotor test rig.

A piezoelectric microvalve for compact high-frequency, high-differential pressure hydraulic micropumping systems

“…This concept of hydraulically amplifying the limited stroke of a miniature bulk piezoelectric material into a significantly larger motion of a valve cap structure enables the valve to simultaneously meet a set of high frequency ( 1 kHz), high pressure ( 300 kPa), and large stroke (20)(21)(22)(23)(24)(25)(26)(27)(28)(29)(30) ) requirements not previously satisfied by other hydraulic flow regulation microvalves. The active valve structural behavior and flow regulation capabilities were evaluated over a range of applied piezoelectric voltages, actuation frequencies, and differential pressures across the valve.…”

“…These characteristics resulted in limited differential pressure 50 kPa and limited frequency 50 Hz capabilities for the valve device. A promising concept for achieving high frequency operation ( 1 kHz) in conjunction with large differential pressure ( 300 kPa) and large valve stroke (20)(21)(22)(23)(24)(25)(26)(27)(28)(29)(30) ) capabilities involves the use of miniature-sized bulk piezoelectric elements (for example 1 mm in thickness-almost an order of magnitude smaller in length than those in [24]- [26]), actuating a stiff micromachined piston-type structure, with an integrated area-ratio hydraulic amplification mechanism for amplifying the limited deflection of the piezoelectric material into a significantly larger valve cap stroke. This concept for microscale systems has been introduced in [12] and [13].…”

“…In an application for active vibration control, a piezoelectric actuator uses the volume change of a piezoelectric ring to create a large deflection of a smaller area contact surface [27]. In an application for vibration control of a rotary dynamic system, the deflection of a stack-type piezoelectric actuator is coupled through an hydraulic line to a smaller size piston, which helps to control the motion of a rotating shaft [28]. These and other [29] piezoelectric hydraulic amplification mechanisms are novel in design, yet do not face the difficult fabrication, assembly, and tolerancing challenges inherent in the development of microscale systems.…”

The Vibration Isolation Technologies of Load in Aviation and Navigation

“…However, it is costly, complicated and hard to realize. There are still problems in its application [12].…”

Estudo do controle ativo e passivo de vibrações em sistemas rotativos e estruturais

“…Dentre os dispositivos passivos, podem-se citar os squeeze-film dampers [49,147,165,185], os seal-dampers [192], os suportes viscoelásticos [19,39,54,88], os absorvedores dinâmicos pendulares [79,174], os absorvedores dinâmicos de esferas [8,103], e os anéis hidrocompensadores [14,169]. Dentre os dispositivos semi-ativos ou ativos, podem-se citar os squeeze-film dampers híbridos [58], os squeeze-film dampers ativos com fluido magnetorreológico [90,121,208], mancais com sistema ativo de câmaras hidráulicas [9,166,188], os mancais hidrodinâmicos com acumuladores de impedância variável [72], os mancais com atuadores piezoelétricos [5,144], os mancais com atuadores piezoidráulicos [183], os mancais com lubrificação ativa [135,167,168], os mancais hidrostáticos ativos [22,23,146], os mancais ativos com fluido magnetorreológico [142], os amortecedores rotativos com fluido magnetorreológico [182,193,194], os mancais do tipo foil híbridos [75], os mancais de geometria ativa [98,181], e os mancais magnéticos ativos [93,173]…”