Active vibration control

About: Active vibration control is a research topic. Over the lifetime, 6770 publications have been published within this topic receiving 76599 citations. The topic is also known as: active vibration damping.

A programmable broadband low frequency active vibration isolation system for atom interferometry.

Abstract: Vibration isolation at low frequency is important for some precision measurement experiments that use atom interferometry. To decrease the vibrational noise caused by the reflecting mirror of Raman beams in atom interferometry, we designed and demonstrated a compact stable active low frequency vibration isolation system. In this system, a digital control subsystem is used to process and feedback the vibration measured by a seismometer. A voice coil actuator is used to control and cancel the motion of a commercial passive vibration isolation platform. With the help of field programmable gate array-based control subsystem, the vibration isolation system performed flexibly and accurately. When the feedback is on, the intrinsic resonance frequency of the system will change from 0.8 Hz to about 0.015 Hz. The vertical vibration (0.01-10 Hz) measured by the in-loop seismometer is reduced by an additional factor of up to 500 on the basis of a passive vibration isolation platform, and we have proved the performance by adding an additional seismometer as well as applying it in the atom interferometry experiment. (c) 2014 AIP Publishing LLC.

The shock and vibration bulletin

Abstract: : Contents: Electrical generation of motion in elastomers; Controlled deceleration specimen protection systems for electrodynamic vibration systems; Control techniques for simultaneous three-degree-of-freedom hydraulic vibration system; Initial report on equivalent damage measurement by utilizing S/N fatigue gages; Hologram interferometry as a practical vibration measurement technique; Response of an elastic structure involving cross correlations between two randomly varying excitation forces; Automatic normalization of structural mode shapes; Resonant beam high 'G' vibration testing; The use of liquid squeeze- films to support vibrating loads; Point-to-point correlation of sound pressures in reverberation chambers; Environmental laboratory missile failure rate test with aerodynamic function simulation; Apollo CSM dynamic test program; Modal survey results from the Mariner Mars 1969 spacecraft; Uprated Saturn I full scale dynamic test correlation; An approach for duplicating spacecraft flight- induced body forces in a laboratory; Flexure guides for vibration testing; A compression-fastened general-purpose vibration and shock fixture; Vibration equivalence, fact or fiction; Providing realistic vibration test environments to tactical guided missiles; The reduction of the vibration level of a circular shaft moving transversely through water at the critical Reynolds number; Analysis and design of resonant fixtures to amplify vibrator output.

Boundary control of an axially moving string: actuator dynamics included

Abstract: In this paper, an active vibration control of a translating tensioned string with the use of an electro-hydraulic servo mechanism at the right boundary is investigated. The equations of motion of the string are derived by using Hamilton's principle for the systems with changing mass. The control objective is to suppress the transverse vibrations of the string via a rightboundary control. An energy-based right-boundary control law, generating a specific current input to the servo-valve, is derived. It is revealed that a time-varying boundary force, as a function of the slope of the string at the right end and a suitably chosen damping coefficient of the actuator, can successfully suppress the transverse vibrations. The exponential stability of the closed loop system is proved. The effectiveness of the proposed control law is demonstrated via simulations.