✦ LIBER ✦

PHASE COMPENSATION FOR FEEDBACK CONTROL OF ENCLOSED SOUND FIELDS

✍ Scribed by R.L. Clark; K.D. Frampton; D.G. Cole

Publisher: Elsevier Science
Year: 1996
Tongue: English
Weight: 402 KB
Volume: 195
Category: Article
ISSN: 0022-460X
DOI: 10.1006/jsvi.1996.0457

No coin nor oath required. For personal study only.

✦ Synopsis

A method of improving the active control of reverberant sound fields, using phase compensation within a local feedback control loop, is presented in this study. A coupled, feedback model of the reverberant sound field, including in-bandwidth transducers, is developed to capture accurately the phase characteristics of the system response, particularly at low-frequencies which dominate closed-loop system performance and stability. Phase compensation is introduced to alleviate problems resulting from in-bandwidth transducers by constraining the open-loop system response to emulate positive-real system behaviour over the bandwidth to be controlled. An increase in the dissipation of acoustic energy is observed from the approach presented herein, as opposed to direct output feedback control originally proposed by Olson and May [21].

📜 SIMILAR VOLUMES

Statistical Aspects of Active Control in

Statistical Aspects of Active Control in Harmonic Enclosed Sound Fields

✍ P. Joseph; S.J. Elliott; P.A. Nelson 📂 Article 📅 1994 🏛 Elsevier Science 🌐 English ⚖ 1005 KB

This paper deals with the active control of harmonic enclosed sound fields, special emphasis being given to the low and high frequency limits. A general statistical approach is adopted which seeks to quantify the performance of some well known active control strategies by specifying the mean acousti

Conditions for the phase–plane analysis

Conditions for the phase–plane analysis of feedback control of chemostat

✍ Kazuyuki Shimizu; Masakazu Matsubara 📂 Article 📅 1985 🏛 John Wiley and Sons 🌐 English ⚖ 432 KB 👁 2 views

This article deals with the effect of P-control and PIcontrol on the dynamic behavior of a continuous stirred tank fermentor (CSTF). Several conditions concerning the stability of steady states and the existence of limit cycles of the closed-loop system are derived. The application is made to the su

FEEDBACK STRUCTURE-BORNE SOUND CONTROL O

FEEDBACK STRUCTURE-BORNE SOUND CONTROL OF A FLEXIBLE PLATE WITH AN ELECTROMAGNETIC ACTUATOR: THE PHASE LAG PROBLEM

✍ M.Z. Ren; K. Seto; F. Doi 📂 Article 📅 1997 🏛 Elsevier Science 🌐 English ⚖ 329 KB

In this paper an experimental study is presented on active control of a clamped plate at audio frequencies by using feedback controller and electromagnetic actuator. The controller is designed with modern control theory on a lumped parameter model of the plate, and is then implemented in experiments

Development of computerized feedback con

Development of computerized feedback control for the continuous phasing of Bacillus subtilis

✍ John D. Sheppard; David G. Cooper 📂 Article 📅 1990 🏛 John Wiley and Sons 🌐 English ⚖ 500 KB 👁 2 views

Design of a field voltage controller for

Design of a field voltage controller for a synchronous generator using feedback linearization

✍ Wladyslaw Mielczarski; Antoni M. Zajaczkowski 📂 Article 📅 1991 🏛 John Wiley and Sons 🌐 English ⚖ 774 KB

A COMPARISON OF NEAR-FIELD ACOUSTIC ERRO

A COMPARISON OF NEAR-FIELD ACOUSTIC ERROR SENSING STRATEGIES FOR THE ACTIVE CONTROL OF HARMONIC FREE FIELD SOUND RADIATION

✍ X. Qiu; C.H. Hansen; X. Li 📂 Article 📅 1998 🏛 Elsevier Science 🌐 English ⚖ 356 KB

A theoretical comparison of a number of near-field acoustic error sensing strategies is undertaken for active control of harmonic free-field sound radiation. Error sensing strategies investigated include the minimization of acoustic potential energy density, acoustic kinetic energy density, total ac