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

GeSpectrum Technologies Inc.是一家专门从事水声换能器和声学系统的工程公司，满足各种客户的需求，如水听器和声学投影仪的设计和制造，以及主要用于石油和天然气、国防和监视以及环境部门的声学系统的集成和测试顾问。GeoSepctrum的产品和服务范围广泛，包括水声系统，从换能器设计到控制、软件、绞车和搬运系统。GeoSpectrum正在为地震勘探开发一种新型的相干低频声音投影仪(相干震源或CSS)，在控制高幅度信号产生和限制谐波失真方面面临挑战。如果不能更好地控制声源，产品将效率低下，并提供更低分辨率的成像，同时还会对环境产生更大的影响。为了应对这些挑战和提高市场地位，该公司需要开发超出其现有能力的新控制方法。目前，该公司热衷于与潘博士合作开展该项目，该项目涉及对声学系统进行建模研究，为声学系统开发先进的控制方法，以产生所需的低频和高幅度水下测量所需的声信号。有效抑制谐波失真的潜在方法包括迭代学习控制、鲁棒非线性控制和带模型辨识的自适应控制。还将对仿真研究和实时实现进行研究。新设备的潜在商业化将使GeoSpectrum和大西洋加拿大公司成为与达尔豪西大学合作开发声学系统的领先者。

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.