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Acoustic covering layer echo reduction measuring method on basis of multichannel space-time inverse filtering technology

An acoustic covering layer and echo reduction technology, which is applied in the direction of analyzing solids using sound waves/ultrasonic waves/infrasonic waves, can solve problems such as reverberation interference of measurement signals, failure to form a free field environment, and increased measurement errors, so as to reduce influence and increase Spatial resolution, the effect of eliminating the influence of the measurement signal

Inactive Publication Date: 2015-12-23
ZHEJIANG UNIV
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Problems solved by technology

In the case of low frequencies, since the sound-absorbing materials around the measurement environment cannot completely absorb the sound waves, a free-field environment cannot be formed, and the measurement signal is severely interfered by reverberation, resulting in increased measurement errors

Method used

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  • Acoustic covering layer echo reduction measuring method on basis of multichannel space-time inverse filtering technology
  • Acoustic covering layer echo reduction measuring method on basis of multichannel space-time inverse filtering technology
  • Acoustic covering layer echo reduction measuring method on basis of multichannel space-time inverse filtering technology

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Embodiment Construction

[0020] The present invention will be further described below in conjunction with the accompanying drawings.

[0021] refer to Figure 1 ~ Figure 2 , a method for measuring echo reduction in acoustic overlays based on multi-channel space-time inverse filtering technology, for the measurement of echo reduction in large samples of acoustic overlays in limited spaces. The technical scheme of the whole measurement method is as follows:

[0022] 1) Generate a single-channel space-time inverse filter transmit signal

[0023] 11) First, the channel response is estimated using the least squares algorithm. The time-domain transfer function of the underwater acoustic channel can be expressed by the following formula

[0024] g ( t ) = Σ i = 0 M - 1 a i ...

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Abstract

The invention discloses an acoustic covering layer echo reduction measuring method on the basis of a multichannel space-time inverse filtering technology. The method comprises the following steps: (1) generating a single channel space-time inverse filtering emission signal; (2) generating a multichannel space-time inverse filtering emission signal; (3) collecting a sample echo signal and an incident signal; (4) calculating the echo reduction measured value. By synchronously emitting the inversion signals of a circuit channel and underwater acoustic channel and multichannel inversion signals, the focusing of measuring signals in the space and time-domain pulse compression can be achieved, and the goals of reverberation inhibition, direct path wave separation, and multiple times of echoes of a multilayer sample can be realized.

Description

technical field [0001] Underwater acoustic coatings are widely used and crucial underwater components in underwater acoustic engineering. In order to evaluate the echo reduction performance of acoustic coating samples, the echo reduction measurement of large samples under laboratory conditions is an important means , The invention relates to a method for measuring the echo reduction of a large sample of an underwater acoustic covering layer. Background technique [0002] The concept of acoustic covering layer was proposed in 2010, which refers to special functional acoustic materials and structures laid on underwater components, mainly composed of anechoic tiles, sound insulation tiles, vibration suppression tiles, decoupling tiles, array mufflers, etc. with different acoustic functions Acoustic protection system composed of a series of products. On the one hand, the acoustic covering layer can absorb active detection sound waves and reduce the acoustic target intensity of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/04
Inventor 李建龙肖甫李素旋
Owner ZHEJIANG UNIV
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