Online identification method suitable for equivalent inductance and resistance of a magnetostrictive transducer

Abstract

The invention discloses an online identification method suitable for equivalent inductance and resistance of a magnetostrictive transducer. The magnetostrictive underwater acoustic transducer is essentially a complex electromechanical coupling body and can be regarded as a resistive inductive load, and the acoustic resistance of the magnetostrictive underwater acoustic transducer is greatly influenced by water depth, flow velocity, density and viscosity in deep water, so that the equivalent inductance and resistance of the magnetostrictive underwater acoustic transducer rapidly change in a large range and are not easy to measure. The method comprises the following steps: discretizing a differential equation satisfied by terminal voltage VO and working current iO of the magnetostrictive underwater acoustic transducer, and obtaining preliminary identification results LOm (n) and ROm (n) of equivalent inductance and resistance through matrix inversion operation; furthermore, the influenceof measurement noise on a parameter identification result is reduced by adding a first-order low-pass filter, and a final identification result LO (n) and RO (n) are obtained. The method has the advantages that the method is simple, the real-time equivalent inductance and resistance of the magnetostrictive underwater acoustic transducer can be identified on line, and the accuracy, stability and robustness of current closed-loop control of an electroacoustic transducer system are improved.

Description

technical field [0001] The invention relates to an electroacoustic transducer system in the fields of ocean communication, navigation and seabed imaging, in particular to an online identification method applicable to the equivalent inductance and resistance of a magnetostrictive transducer. Background technique [0002] The submarine electro-acoustic transducer system consists of a digital power amplifier and an underwater acoustic transducer, and the underwater acoustic transducer can be regarded as the load of the digital power amplifier. However, long-term operation experience shows that the current underwater acoustic transducer system still needs to be improved. Many applications require a sound source with constant parameters, and require a small change in the amplitude of the sound source within a wide frequency range. In order to achieve this goal, a feasible and effective solution is to perform closed-loop control on the working current or voltage of the underwater ...

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Problems solved by technology

In addition, the acoustic resistance of the transducer is greatly affected by water depth, flow velocity, density and viscosity in deep water, making its equivalent inductance and resistance change rapidly in a wide range, making its actual equivalent inductance and resistance more difficult to obtain

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