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Internal Model Control for a Light-Weight Active Noise-Reducing Casing

Mazur K., Pawełczyk M.

Archives of Acoustics

2016

Vol. 41, No. 2

315--322

The active noise-reducing casing developed and promoted by the authors in recent publications have multiple advantages over other active noise control methods. When compared to classical solutions, it allows for obtaining global reduction of noise generated by a device enclosed in the casing. Moreover, the system does not require loudspeakers, and much smaller actuators attached to the casing walls are used instead. In turn, when compared to passive casings, the walls can be made thinner, lighter and with much better thermal transfer than sound-absorbing materials. For active noise control a feedforward structure is usually used. However, it requires an in-advance reference signal, which can be difficult to be acquired for some applications. Fortunately, usually the dominant noise components are due to rotational operations of the enclosed device parts, and thus they are tonal and multitonal. Therefore, it can be adequately predicted and the Internal Model Control structure can be used to benefit from algorithms well developed for feedforward systems. The authors have already tested that approach for a rigid casing, where interaction of the walls was significantly reduced. In this paper the idea is further explored and applied for a light-weight casing, more frequently met in practice, where each vibrating wall of the casing influences all the other walls. The system is verified in laboratory experiments.

Odporna MFC-PID regulacja temperatury

Skoczowski S., Misztal H.

Zeszyty Naukowe. Elektryka / Politechnika Łódzka

2001

z. 97

126--134

W pracy [1] rozpatrywano nową dwupętlową strukturę „Model Following Control (MFC) i zaprezentowano wyniki badań eksperymentalnych z wykorzystaniem laboratoryjnego obiektu elektrotermicznego. W prezentowanym obecnie referacie przedstawiono wyniki badań zmodyfikowanej struktury MFC-P z wykorzystaniem identycznego jak poprzednio obiektu i przemysłowych regulatorów dwustawnych z korekcją PID oraz regulatorów cyfrowych. Modyfikacja układu MFC polega na zmianie roli modelu, który w tej strukturze jest wykorzystany podobnie jak w znanej strukturze Internal Model Control (IMC).

In [1] a new two-loop control structure called “Model Following Control” (MFC) along with its experimental tests employing a laboratory electrothermal plant was discussed. In the paper presented below results of tests carried out on a modified MFC- P structure with the use of the same plant as before and industrial FID two-position and digital controllers are described. The MFC modification consists in that the model is employed here in the same way as it is in the known Internal Model Control (IMC) structure.