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Method of separating sound field radiated by static sound source and sound field radiated by rotating sound source

A sound source and sound field technology, applied in the measurement of ultrasonic/sonic/infrasonic waves, measuring devices, instruments, etc.

Inactive Publication Date: 2017-01-04
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, the above two methods for separating the radiated sound field from a stationary sound source and the radiated sound field from a rotating sound source both separate the single harmonic steady-state sound field in the frequency domain. method will no longer apply

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  • Method of separating sound field radiated by static sound source and sound field radiated by rotating sound source
  • Method of separating sound field radiated by static sound source and sound field radiated by rotating sound source
  • Method of separating sound field radiated by static sound source and sound field radiated by rotating sound source

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Embodiment Construction

[0068] In this embodiment, the method for separating the radiated sound field of the stationary sound source and the radiated sound field of the rotating sound source is carried out as follows:

[0069] Step 1, see figure 1 , at a static source S s and the rotating sound source S r The measurement surface H is set in the mixed sound field of common radiation, and M measurement points C are uniformly distributed on the measurement surface H m , place M microphones in one-to-one correspondence at M measurement points for measurement, and obtain the receiving time t i The one-to-one correspondence of the holographic sound pressure at each measurement point is will receive time t i Holographic sound pressure P at all M measuring points i Characterized as:

[0070] i is a positive integer, and T represents the transposition of the matrix;

[0071] Step 2. In the envelope static source S s and the rotating sound source S r Ns static equivalent sources Es are distributed ...

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Abstract

The invention discloses a method of separating a sound field radiated by a static sound source and a sound field radiated by a rotating sound source. The method is characterized by comprising the following steps: setting a measurement plane in a mixed sound field jointly radiated by a static sound source and a rotating sound source, and using microphones to measure the holographic sound pressure at each measurement point in the measurement plane at receiving time; distributing a static equivalent source and a rotating equivalent source in a sound source plane enveloping the static sound source and the rotating sound source, and building the transmission relationship between mixed equivalent source strength and holographic sound pressure according to the sound radiation laws of the static sound source and the rotating sound source; obtaining the mixed equivalent source strength according to the transmission relationship under known holographic sound pressure, and separating static equivalent source strength and rotating equivalent source strength from the mixed equivalent source strength; and finally, separating a sound field radiated by the static sound source and a sound field radiated by the rotating sound source. The method of the invention can be used to directly implement sound field separation in the time domain, and is applicable to any linear acoustic field, including a steady-state sound field and a non-steady-state sound field.

Description

technical field [0001] The invention relates to a sound field separation method in the field of noise in physics specialty, more specifically, a method for solving the problem of how to separate the radiation sound field of a target sound source from a mixed sound field when sound sources with different radiation characteristics exist. Background technique [0002] In practical engineering, stationary sound sources and rotating sound sources often exist at the same time, such as the stator (stationary sound source) and rotor (rotating sound source) in the duct of an aeroengine, the generator of a wind turbine (stationary sound source) and the rotating blades (rotating sound source), etc., which makes the measured sound field include both the sound field radiated by the stationary sound source and the sound field radiated by the rotating sound source. In order to independently study the radiation characteristics of the stationary sound source and the radiation characteristics...

Claims

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Application Information

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IPC IPC(8): G01H11/06
CPCG01H11/06
Inventor 毕传兴张小正张永斌徐亮
Owner HEFEI UNIV OF TECH
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