Acoustic measurement system with tunable radial magnetic field loading device

A technology of radial magnetic field and loading device, which is used in measuring devices, scientific instruments, and analysis of solids using sonic/ultrasonic/infrasonic waves, etc. problem, to achieve the effect of uniform force in the radial direction, easy operation and reduced influence

Inactive Publication Date: 2019-11-26
JIANGSU UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0006] 1. The radial loading of the magnetic field cannot be completed, and the magnetic field loading dire...

Method used

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  • Acoustic measurement system with tunable radial magnetic field loading device
  • Acoustic measurement system with tunable radial magnetic field loading device
  • Acoustic measurement system with tunable radial magnetic field loading device

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Embodiment Construction

[0044] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0045]The outer radius of the ring frame of the tunable radial magnetic field loading device of the present invention is 250m, the inner radius is 225mm, and the width is 100mm; the diameter of the cylindrical iron core is 20mm, and the length is 210mm; the radius of the copper enameled wire is 0.6mm; the number of turns of a single coil unit of the tunable radial magnetic field loading device formed by the cylindrical iron core and the copper enameled wire is 1000.

[0046] In this embodiment, the impedance tube has an inner radius r=50 mm, an outer radius R=60 mm, and is made of aluminum material.

[0047] In this embodiment, the coil baffle is made of nylon with a thickness of 3 mm.

[0048] In this embodiment, the ring frame of the tunable radial magnetic field loading device is supported and fixed by a support frame. The specific opera...

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Abstract

The invention relates to the technical field of sound insulation testing of an impedance tube, in particular to an acoustic measurement system with a tunable radial magnetic field loading device. Theacoustic measurement system comprises an impedance tube measurement system and a tunable radial magnetic field loading device. The tunable radial magnetic field loading device is composed of a circular-ring-shaped frame, a support frame, a coil unit, a lock nut, an insulating washer, and a DC power supply and is arranged outside the impedance tube measurement system; the magnetic field plane generated by the tunable radial magnetic field loading device is perpendicular to the impedance tube axis of the impedance tube measurement system, so that the circular-ring-shaped frame of the tunable radial magnetic field loading device and the impedance tube are in a concentric manner. Since the distance between the end of the coil unit and the outer surface of the impedance tube is controlled within 2 mm, the radial magnetic field is applied to a tested piece; and the tunable radial magnetic field loading device can move axially along the impedance tube, so that the radial magnetic field can beloaded at any position of the impedance tube.

Description

technical field [0001] The invention relates to the technical field of impedance tube sound insulation testing, in particular to an acoustic measurement system with an adjustable radial magnetic field loading device. [0002] technical background [0003] In the past 50 years, in modern social life, with the rapid development of national high-speed trains, aerospace, large-scale power transmission and transformation projects, etc., the noise problem affects the rapid development of various fields on the one hand, and interferes with people's normal life on the other hand. work and life. In order to improve the impact of noise on people's normal life and enhance the adaptability of materials to complex acoustic environments, various sound insulation materials using magnetorheological materials and based on magnetic field control have developed rapidly. In order to obtain good sound insulation performance that can change in real time, its sound insulation experiment under the ...

Claims

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Application Information

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IPC IPC(8): G01N29/04G01N29/22
CPCG01N29/04G01N29/22G01N2291/023G01N2291/2698
Inventor 吴卫国曾天成刘闯
Owner JIANGSU UNIV
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