Electromechanical integrated low-frequency acoustic emission energy transducer

Abstract

The invention relates to an electromechanical integrated low-frequency acoustic emission energy transducer. The electromechanical integrated low-frequency acoustic emission energy transducer is an integrated structure formed by connection of an electromagnetic driving device, a low-frequency acoustic excitation device for balancing the static pressure of a liquid medium in a tube and an acoustic measuring cavity. The electromechanical integrated low-frequency acoustic emission energy transducer is simple in structure and convenient to use. Through use of a viscous damper which can move freelyat low-speed relative motion, and can be used as a rigid body at high-speed relative motion, the problem of displacement compensation during static pressurization can be solved, static displacement compensation and transmission of a dynamic force above a certain frequency to a mechanical piston can be achieved, and the electromechanical integrated low-frequency acoustic emission energy transducerhas the advantages of compact structure, excellent performance and convenient use, effectively satisfies requirements for acoustic transmission characteristic testing of pumps and valves, acoustic impedance characteristic testing of pipeline components, and active control of pipeline noise, and also satisfies requirements for testing of acoustic parameters such as acoustic impedance at low frequencies of underwater acoustic materials.

Description

technical field [0001] The invention relates to the field of transducers, in particular to a hydrodynamic noise source characteristic test that can be widely used in pumps and valves, the acoustic impedance test of flow state pipeline components, active control of hydrodynamic noise in the working medium in the pipe, and hydroacoustic materials. An electromechanical integrated low-frequency acoustic emission transducer for low-frequency acoustic performance testing. Background technique [0002] At present, the acoustic transducers used in the field of underwater acoustic testing are basically piezoelectric transducers. This kind of transducer has a wide frequency response range and stable performance, but the lower limit of the working frequency is relatively high, generally above 200Hz. The lower frequency limit required by the acoustic performance test of road equipment and components needs to reach 20Hz or even lower, and piezoelectric transducers obviously cannot meet t...

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Problems solved by technology

[0004] 1) The electromagnetic exciter and the mechanical piston are two independent structures, which are inconvenient to install and use, and require auxiliary brackets or driving to hang the exciter;

[0005] 2) Since the vibration exciter transmits dynamic force to the piston through the connecting rod, the connecting rod is thin and the stiffness is insufficient, the vibration energy transmitted from the vibration exciter to the piston is limited, which affects the intensity of the piston's acoustic emission;

[0006] 3) In the active control of the hydrodynamic low-frequency line spectrum noise of the working medium in the pipe, the phase characteristic of the combination of the vibration exciter and the piston is not good, and it is difficult to be practical in engineering

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