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Rotary sound source generating device

A technology for generating devices and sound sources, which is applied in the direction of sound-generating devices and instruments, can solve the problems of high cost and low efficiency of fan sound source processing, and achieve the effects of reducing test costs, simplifying test equipment, and easy operation

Active Publication Date: 2015-07-01
CHINA AIRPLANT STRENGTH RES INST
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problems of high fan sound source processing cost or the introduction of additional noise and low efficiency in the above-mentioned existing fan noise reduction test, and provide a rotating sound source generator with simple and reasonable structure, which can reduce test cost and improve work efficiency. device

Method used

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Embodiment Construction

[0021] In order to better understand the rotating sound source generating device according to the solution of the present invention, a preferred embodiment of the rotating sound source generating device of the present invention will be further described below in conjunction with the accompanying drawings.

[0022] Aeroengines work under different working conditions, corresponding to different fan speeds and different blade passing frequencies. The main noise component of fan noise is the corresponding rotational modal noise at the blade pass frequency and its harmonic frequency. The rotating sound source generating device provided by the present invention uses fixed loudspeakers arranged in a ring to produce sound, and forms rotating modal noise in the simulated pipeline. Different frequencies are determined according to the sound frequency of the speakers, and different modes are determined according to the number of speakers and the noise phase difference between the speaker...

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Abstract

The invention relates to a sound source generating device, in particular to a rotary sound source generating device suitable for aeroengine fan noise study. The rotary sound source generating device comprises a multichannel signal generator, a power amplifier and a sounding device which are serially connected through a lead, the multichannel signal generator is provided with two output ports which are in lead connection with the power amplifier, the power amplifier is in lead connection with a loudspeaker and is provided with a loudspeaker clamp to clamp and fix the loudspeaker, the loudspeaker is in threaded connection with one ends of waveguide tubes, the other ends of the waveguide tubes are connected with a simulation pipeline through flanges, the simulation pipeline is of a cylindrical structure, and the waveguide tubes are annularly and uniformly arranged on the simulation pipeline. The rotary sound source generating device can replace fan blades through frequency or replace blades through frequency to harmonize noise of frequency, and is simple in structure, experiment cost can be lowered, and accuracy and efficiency of experiments are improved.

Description

technical field [0001] The invention relates to a sound source generating device, in particular to a rotating sound source generating device. Background technique [0002] It is an effective method to reduce engine noise to control fan noise from the propagation path, and there must be a sound source with fan noise characteristics. At present, there are two ways to solve the sound source of the fan: one is to use the engine to drive the fan as the sound source, which requires the engine and the entire supporting device, the test device is extremely complicated, and the research cost is high; This form is also relatively complicated, and increases the noise of the motor, requiring special sound insulation facilities for the motor, and the research cost is too high. Contents of the invention [0003] The purpose of the present invention is to solve the problems of high fan sound source processing cost or the introduction of additional noise and low efficiency in the above-m...

Claims

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Application Information

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IPC IPC(8): G10K9/12
Inventor 燕群薛东文黄文超高翔潘凯侯峰王兰
Owner CHINA AIRPLANT STRENGTH RES INST
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