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Grain Sound Attenuation Coefficient Measuring System and Method

A measurement method and technology of attenuation coefficient, applied in the direction of measuring device, material analysis using sound wave/ultrasonic wave/infrasonic wave, instrument, etc., can solve problems such as unusable, unable to reflect sound wave attenuation, sound wave signal strength estimation, etc.

Inactive Publication Date: 2019-03-29
SHENYANG POLYTECHNIC UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this sound absorption coefficient cannot reflect the attenuation of the sound wave due to scattering and absorption on the propagation path per unit length, nor can it be used to estimate the strength of the sound wave signal with a known propagation distance that is urgently needed in practice

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  • Grain Sound Attenuation Coefficient Measuring System and Method
  • Grain Sound Attenuation Coefficient Measuring System and Method
  • Grain Sound Attenuation Coefficient Measuring System and Method

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Embodiment Construction

[0036] The present invention will be further described below in conjunction with the accompanying drawings, but the system involved in the present invention is not limited to the specific model and size given in the description when it is actually produced.

[0037] The invention proposes a grain sound attenuation coefficient measurement system, figure 1 A schematic diagram of the system composition is given. Wherein the inner size of grain trough 9 is 1.80m * 0.70m * 0.7m, and the inside is filled with soybeans. Speaker 1 uses a 3.5-inch full-range horn with the model number TC9FD-18-08, and is packaged in a metal protective cover with a diameter of 10 cm and a large mesh grille. The models of near-end microphone 2 and far-end microphone 3 are MP201. The models of the near-end preamplifier 4 and the far-end preamplifier 5 are MA211. The near-end microphone 2 is connected to the near-end preamplifier 4 through threads, and the far-end microphone 3 is connected to the far-en...

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Abstract

The invention discloses a system and method for measuring the sound attenuation coefficient of grain. The system is composed of a grain trough, a loudspeaker, a power amplifier, a microphone, a preamplifier, a signal conditioner, a data collector and a computer; After the amplifier, the loudspeaker is driven to emit sound waves. The sound waves pass through the food and are received by two microphones and converted into electrical signals. The electrical signals are fed into the computer through the preamplifier, signal conditioner and data collector. Perform band-pass filtering and signal interception respectively, and then use the orthogonal sequence demodulation method to estimate the signal amplitude and obtain the sound attenuation coefficient. With this system, the relationship curve between grain sound attenuation coefficient and sound wave frequency can be measured accurately and quickly, and then the strength of sound wave signal with known propagation distance can be estimated, which provides a basis for the design of sound detection system for grain storage.

Description

technical field [0001] The invention belongs to the field of measuring devices, and relates to a grain sound attenuation characteristic measurement system, in particular to a grain sound attenuation coefficient measurement system and method. Background technique [0002] The safe storage of grain is a strategic event related to the national economy and the people's livelihood, and has important social and economic significance. The use of acoustic detection to monitor stored grain pests and the use of acoustic CT to monitor stored grain temperature have attracted much attention in recent years due to their unique advantages. The application of these technologies in the actual granary requires understanding and mastering the attenuation characteristics of sound waves of different frequencies in the grain. [0003] Acoustic attenuation is a phenomenon in which the intensity of sound waves gradually decreases with the increase of propagation distance when propagating in a medi...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N29/032
CPCG01N29/032G01N2291/015
Inventor 颜华于鹏周英钢王伊凡
Owner SHENYANG POLYTECHNIC UNIV