A device and method for measuring the high-frequency normal reflection coefficient of an acoustic coating
A technology of acoustic covering layer and reflection coefficient, which is applied to processing detection response signals, using sound waves/ultrasonic waves/infrasonic waves to analyze solids, instruments, etc., and can solve the problem of high-frequency normal reflection coefficient measurement devices and methods for acoustic covering layers that have not yet been formed and other problems, to achieve the effect of being conducive to acoustic measurement, strong pressure resistance, and good sound absorption effect
Active Publication Date: 2020-09-11
HARBIN ENG UNIV
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[0006] To sum up, there is no measurement device and method for measuring the high-frequency normal reflection coefficient of the acoustic coating.
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[0035] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0036] combine Figure 1 to Figure 9 , a device for measuring the high-frequency normal reflection coefficient of an acoustic coating, comprising a booster pump 1, a tank body 2, a sound-absorbing wedge 3, a first scanning mechanism 4, a second scanning mechanism 5, a sound source 6, a hydrophone Device 7, acoustic covering layer 8, bracket 9; pressure pump 1 is an electric pressure test pump, model 4DSY series, rated power 1.1kW; pressure pipe 11 is a three-layer structure, the tank body is cylindrical, and one end of the tank body It is a spherical head and the other end is open. There is an ellipsoidal head on the top of the tank. The sound-absorbing wedge is connected in series by rubber balls of different diameters. The acoustic covering layer is installed on the bracket, which is installed on the open side of the tank. At the m...
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Abstract
The invention provides a device and a method for measuring an acoustic coating layer high-frequency normal reflection coefficient. The device comprises a pressurizing pump, a tank, an acoustic wedge,a support, a first scanning mechanism and a second scanning mechanism. The tank is in a cylindrical shape; a spherical head is arranged on one end of the tank; the other end of the tank is opened; anellipsoidal head is arranged on the top part of the tank; the acoustic wedge is formed by serially connecting rubber balls with different diameters; an acoustic coating layer is arranged on the support; the support is arranged on the opening of the tank; the first scanning mechanism is arranged in the tank; the second scanning mechanism is arranged in the tank. The invention also provides the method for measuring the acoustic coating layer high-frequency normal reflection coefficient. According to the device and the method for measuring the acoustic coating layer high-frequency normal reflection coefficient provided by the invention, the problem of a big error brought by an included angle existed between a spherical wave and the surface of the acoustic coating layer in a conventional measuring method is solved.
Description
technical field [0001] The invention relates to a device and method for measuring the high-frequency normal reflection coefficient of an acoustic covering layer, belonging to the field of acoustic measurement. Background technique [0002] At present, the commonly used underwater device for measuring the normal reflection coefficient of the acoustic coating is an acoustic tube. The corresponding measurement methods include the pulse method and the double hydrophone transfer function method. The measurement device and measurement method require the acoustic coating to be a small sample. At the same time, due to the requirement of propagating plane waves in the sound tube, the measurement frequency has an upper limit. For example, the upper limit of the measurement frequency of the Φ57 sound tube is 15kHz. For the measurement of the normal reflection coefficient of the large-scale acoustic coating, the method of near-field acoustic holography can be used to calculate the refle...
Claims
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IPC IPC(8): G01N29/04G01N29/46G01N29/50
CPCG01N29/04G01N29/46G01N29/50G01N2291/023
Inventor 刘永伟师贝裴杰商德江
Owner HARBIN ENG UNIV