Statistically optimal near-field acoustical holography used for visual recognition of air-conditioner noise sources and operation method thereof

A near-field acoustic holography and noise source technology, applied to the measurement of ultrasonic/sonic/infrasonic waves, instruments, measuring devices, etc., can solve the problems of expensive measurement system, low efficiency, time-consuming measurement work and reconstruction calculations, etc.

Inactive Publication Date: 2009-10-14
MIDEA GRP CO LTD
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Problems solved by technology

[0008] For high-frequency situations and when the size of the noise source is large, a large number of measurement points are required, a large number of microphones and a large number of ca

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  • Statistically optimal near-field acoustical holography used for visual recognition of air-conditioner noise sources and operation method thereof
  • Statistically optimal near-field acoustical holography used for visual recognition of air-conditioner noise sources and operation method thereof
  • Statistically optimal near-field acoustical holography used for visual recognition of air-conditioner noise sources and operation method thereof

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Embodiment Construction

[0057] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0058] see Figure 1-Figure 5 , in order to verify the feasibility of the statistical optimal near-field acoustic holography method for identifying the noise source of the air conditioner, the sound source of the air conditioner parts and motors with a length, width and height of 0.5m×0.3m×0.2m is taken as an example.

[0059] Align the centerline of the motor with the center of the microphone in the planar grid array. The distance between any two adjacent microphones in the array is 0.2m, and the size of the array is 0.8m×0.8m. The 25 microphones on the array receive the sound signal from the motor. The sound signal is filtered and amplified by the preamplifier, and then enters the Multi-channel data acquisition system collects and saves data.

[0060] The distance between the surface of the motor and the microphone array is 0.3m, 0.4m and 0.5m respe...

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Abstract

The invention provides statistically optimal near-field acoustical holography used for visual recognition of air-conditioner noise sources and an operation method thereof. The operation method comprises the followings: determining the positions, frequency characteristics and distribution ranges of the noise sources, and distance between microphones on microphone arrays, number, sample rates and number of sampling points of microphones; calibrating arrayed microphones; collecting data; recording sound pressure data; processing the sound pressure data; reading the processed data and finally entering noise source recognition procedures. By the invention, complex sound pressure on reconstructive surfaces and vibration velocity of surface particles can be calculated directly via linear superposition of the complex sound pressure on a holographic plane in a spatial domain, thus essentially overcoming window effects and wraparound errors existing in near-field acoustical holography and avoiding the problems brought about by the demand of a large number of microphones by near-field acoustical holography, such as low reconstruction efficiency of sound fields and costly cost of measuring systems, etc. The invention is characterized by small number of demanded microphones, low measuring cost and high reconstruction efficiency of the sound fields.

Description

technical field [0001] The invention relates to a statistical optimal near-field acoustic holography method and an operation method for visual identification of noise sources of air conditioners, which are used for identification of noise sources of air conditioners and noise fault diagnosis of air conditioners. Background technique [0002] As a household appliance that is closely related to people's life, the quality of air conditioners, especially the noise quality, has attracted more and more attention. The noise of an air conditioner is very complex, and components such as compressors, pipelines, fans, air ducts, and sheet metal parts may all generate noise. To improve the noise quality of an air conditioner, the main source of noise must first be identified. The identification methods of noise sources mainly include subjective evaluation method, near-field measurement method, separate operation method, selective isolation method, spectrum analysis method, coherence fun...

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Application Information

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IPC IPC(8): G01H17/00
Inventor 薛玮飞刘晓明张智李贤华程宏理
Owner MIDEA GRP CO LTD
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