Development of Advanced Control Methodologies for Harmonic Distortion Reduction in Nonlinear Acoustic Source

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GeoSpectrum Technologies Inc. is an engineering company specialized in underwater acoustic transducers andsystems, and meets the needs of various clients as the designers and manufactures of hydrophones and soundprojectors as well as consultants on the integration and testing of acoustic systems, primary to the oil and gas,defence and surveillance and environmental sectors. GeoSepctrum's products and services are wide ranging,including underwater acoustic systems, from transducer design to controls, software, winch and handlingsystems.GeoSpectrum is developing a new, coherent, low frequency sound projector for seismic surveys (CoherentSeismic Source or CSS), and faces challenges in controlling the high amplitude signal generation and limitingharmonic distortion. Without better control of the sound source, the product will be inefficient and providelower resolution imaging, while also having a more significant environmental impact. In order to deal withthese challenges and improve its market position, the company needs to develop new control methods that areoutside of their current capabilities.Currently, the company is keen on working with Dr. Pan on the project that involves conducting research onthe modelling, developing advanced control approaches for the acoustic system to generate a desired lowfrequency and high amplitude desired acoustic signal for underwater surveys. Potential methodologies toeffectively reducing the harmonic distortion include iterative learning control, robust nonlinear control, andadaptive control with model identifications. Simulation studies as well as real time implementation will beinvestigated as well. The potential commercialization of the new device will place GeoSpectrum and AtlanticCanada as a leader on developing acoustic systems in conjunction with Dalhousie University.