A LOCAL ACTIVE NOISE CONTROL SYSTEM BASED ON A NONLINEAR SENSING TECHNIQUE FOR YACHT APPLICATIONS Mylonas D., Erspamer A., Paradisiotis A., Yiakopoulos C., Antoniadis I. National Technical University of Athens, School of Mechanical Engineering, Department of Mechanical Design & Automatic Control, Laboratory of Dynamics and Structures chryiako@cental.ntua.gr Keywords: Nonlinear active noise control (NANC), Functional link networks (FLNs), Nar- rowband noise, Maritime environment. Abstract. Active noise control (ANC) is an important subject that plays a central role in many practical problems. In essence, the ANC technique is based on the principle that a noise can be cancelled by another noise with the same amplitude but an opposite phase. Compared with the passive noise control technique, the ANC method is efficient to suppress noise with lower frequency. As an adaptive controller, the filtered-x least mean square (FxLMS) algorithm has gained substantial popularity owing to its simplicity. Unfortunately, in the physical world, many ANC systems exhibit certain degrees of nonlinearity in the primary or secondary path. In such situations, nonlinear ANC (NANC) algorithm is necessary for further implementation. A novel nonlinear filter, which incorporates the concept of exponential sinusoidal models into nonlinear filters based on functional link networks (FLNs) has been applied in this paper. The proposed filter is designed to provide improved convergence characteristics over traditional FLN filters. The conventional trigonometric FLN (TFLN) may be considered as a special case of the proposed adaptive exponential FLN (AEFLN). An adaptive exponential least mean square (AELMS) algorithm has been derived and the same has been successfully applied for identification of a couple of nonlinear plants. This paper investigates the application of active noise control to the attenuation of the noise produced by two asynchronous generators in a luxury yacht, with the specific aim of creating a quiet region in a twin cabin around the sleep- ing area. 1 INTRODUCTION Passive noise control treatments are an effective means of reducing the levels of noise and vibration experienced by humans in a variety of applications. However, due to both weight and size restrictions their performance in practice is generally limited to the control of higher frequency noise and vibration. To overcome this limitation and achieve significant levels of low frequency noise attenuation, active control methods have been widely investigated. Ac- 1475 EURODYN 2020 XI International Conference on Structural Dynamics M. Papadrakakis, M. Fragiadakis, C. Papadimitriou (eds.) Athens, Greece, 23–26 November 2020 Available online at www.easdprocedia.org EASD Procedia EURODYN (2020) 1475-1490 ISSN:2311-9020 © 2020 The Authors. Published by EASD Procedia. Peer-review under responsibility of the Organizing Committee of EURODYN 2020. doi: 10.47964/1120.9119.19996