Stability and performance limits for active vibration isolation using blended velocity feedback

Alujević, Neven and Wolf, Hinko and Gardonio, Paolo and Tomac, Ivan (2011) Stability and performance limits for active vibration isolation using blended velocity feedback. = Stability and performance limits for active vibration isolation using blended velocity feedback. Journal of Sound and Vibration, 330 (21). pp. 4981-4997. ISSN 0022-460X. Vrsta rada: ["eprint_fieldopt_article_type_article" not defined]. Kvartili JCR: Q1 (2011). Točan broj autora: 4.

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Abstract

This paper presents a theoretical study of active vibration isolation on a two degree of freedom system. The system consists of two lumped masses connected by a coupling spring. Both masses are also attached to a firm reference base by a mounting spring. The lower mass is excited by a point force. A reactive control force actuator is used between the two masses in parallel with the coupling spring. Both masses are equipped with an absolute velocity sensor. The two sensors and the actuator are used to implement velocity feedback control loops to actively isolate the upper mass from the vibrations of the lower mass over a broad range of frequencies. The primary concern of the study is to determine what type of velocity feedback configuration is suitable with respect to the five parameters that characterise the system (the three spring stiffnesses and the two masses). It is shown analytically that if the ratio of the lower mounting spring stiffness to the lower mass is larger than the ratio of the upper mounting spring stiffness to the upper mass (supercritical system), feeding back the absolute upper mass velocity to the reactive force actuator results in an unconditionally stable feedback loop and the vibration isolation objective can be fully achieved without an overshot at higher frequencies. In contrast, if the ratio of the lower mounting spring stiffness to the lower mass is smaller than the ratio of the upper mounting spring stiffness to the upper mass (subcritical system), the upper mass velocity feedback is conditionally stable and the vibration isolation objective cannot be accomplished in a broad frequency band. For subcritical systems a blended velocity feedback is proposed to stabilise the loop and to improve the broad-band vibration isolation effect. A simple inequality is introduced to derive the combinations between the two error velocities that guarantee unconditionally stable feedback loops. © 2011 Elsevier Ltd. All rights reserved.

Item Type: Article (["eprint_fieldopt_article_type_article" not defined])
Keywords (Croatian): Active vibration isolation; Broad bands; Coupling springs; Feed-back loop; Force actuators; Higher frequencies; Lumped mass; Mass velocity; Performance limits; Point force; Reactive control; Spring stiffness; Subcritical systems; Supercritical systems; Theoretical study; Two-degree-of-freedom system; Unconditionally stable; Velocity feedback; Velocity feedback control; Velocity sensor; Vibration isolations; Actuators; Antivibration mountings; Frequency bands; Sensors; Stiffness; Velocity; Vibration analysis
Subjects: TECHNICAL SCIENCE
Divisions: 200 Department of Engineering Mechanics > 230 Chair of Mechanical Systems Dynamics
600 Department of Naval Engineering and Marine Technology > 620 Chair of Marine Structures Design
Indexed in Web of Science: Yes
Indexed in Current Contents: Yes
Quartiles: Q1 (2011)
Date Deposited: 23 Apr 2015 09:11
Last Modified: 15 Dec 2017 12:46
URI: http://repozitorij.fsb.hr/id/eprint/3776

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