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Testing device used for simulating propeller airflow and line spectrum noise of turboprop aircraft

A technology of line spectrum noise and test equipment, which is applied in the field of aeroacoustics test, can solve problems such as the inability to simulate turboprop aircraft without propeller airflow/line spectrum noise, and achieve great practical value, high reliability, and good practicability

Active Publication Date: 2015-05-27
CHINA AIRPLANT STRENGTH RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Purpose of the invention: In order to solve the problem that the existing test device cannot simulate the propeller airflow / line spectrum noise in the flight process of the turboprop aircraft, and achieve the purpose of improving the test accuracy, the present invention provides a simple structure, high control precision and good reliability. Test setup for simulating turboprop propeller airflow / line spectrum noise

Method used

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  • Testing device used for simulating propeller airflow and line spectrum noise of turboprop aircraft
  • Testing device used for simulating propeller airflow and line spectrum noise of turboprop aircraft
  • Testing device used for simulating propeller airflow and line spectrum noise of turboprop aircraft

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment 1: as figure 1 As shown, a test device for simulating propeller airflow and line spectrum noise of a turboprop aircraft, including a fixed bracket 1, a transmission mechanism 2 installed on the fixed bracket 1, a rotating blisk 3 with holes, and an external air source 4 connected The air flow duct 5, the transmission mechanism 2 drives the rotating shaft 7 through the transmission belt 6 to drive the perforated rotating blisk 3 to rotate, and the perforated rotating blisk 3 is provided with several air guide holes 8 whose inner diameter is consistent with the inner diameter of the air flow duct 5, After the perforated blisk 3 is installed on the fixed bracket 1 , the air guide hole 8 is coaxial with the airflow duct 5 . The air guide holes 8 on the perforated blisk 3 are consistent with the inner diameter of the airflow pipe 5, which can ensure that the high-speed airflow introduced from the external air source 4 can cut the air guide holes 8 when the perfora...

Embodiment 2

[0024] In Embodiment 2, a flow velocity measuring device 9 is also provided in the airflow duct 5 for monitoring the airflow velocity.

[0025] Such as image 3 and Figure 4 Shown is a comparison chart formed in a certain experiment. pass image 3 with Figure 4 The comparison between the frequency of the noise to be simulated and the real noise spectrum generated by the device in a certain use state shows that the noise generated by the device is completely consistent with the noise to be simulated in frequency distribution, that is, the first-order frequency is 107.5Hz, and the second-order frequency is 107.5Hz. The frequency is 215Hz, the third-order frequency is 322.5Hz, the fourth-order frequency is 430Hz, the fifth-order frequency is 537.5Hz, and the sixth-order frequency is 645Hz; the difference between the total sound pressure level and the sound pressure level of each frequency is within 5%; it can accurately simulate the propeller The airflow and line spectrum n...

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Abstract

The invention belongs to the testing field of aeronautical acoustics, and relates to a testing device used for simulating propeller airflow / line spectrum noise of a turboprop aircraft. The testing device used for simulating the propeller airflow and the line spectrum noise of the turboprop aircraft comprises a fixing support 1, a transmission mechanism 2 arranged on the fixing support 1, a rotary vane disc 3 with holes and an airflow pipeline 5 connected with an external air source 4. The transmission mechanism 2 drives a rotary shaft 7 through a transmission belt 6 to drive the vane disc 3 with holes to rotate, and a plurality of gas ports 8 with same inner diameter of the airflow pipeline 5 are arranged on the rotary vane disc 3 with holes. As is found through experimental comparison, the testing device used for simulating the propeller airflow and the line spectrum noise of the turboprop aircraft is capable of generating line spectrum noise with frequency doubling relationship, the noise is completely identical to the propeller noise to be simulated in frequency distribution, and differences of an overall sound pressure level and sound pressure level of each frequency are within 5 %. The testing device used for simulating the propeller airflow and the line spectrum noise of the turboprop aircraft are convenient to operate, time-saving and effort-saving, capable of being repeatedly used, and high in reliability, and effectively ensuring the wall sound insulation test to be reasonable and reliable. And therefore the testing device used for simulating the propeller airflow and the line spectrum noise of the turboprop aircraft are good in practicality, easy to popularize and apply, and large in practical value.

Description

technical field [0001] The invention belongs to the field of aeroacoustic tests, and relates to a test device for simulating airflow and line spectrum noise of a propeller of a turboprop aircraft. Background technique [0002] During the flight of a turboprop aircraft, the propeller rotates at high speed, which will generate huge line spectrum noise and airflow pulsation, hitting the skin of the fuselage, seriously affecting the acoustic environment in the aircraft cabin, and destroying the comfort of passengers. Therefore, by simulating the external sound field of the aircraft in the laboratory, carrying out the sound insulation test of the panel structure, and designing a panel structure with high sound insulation, it has always been a common method to control the noise in the aircraft cabin. [0003] In the existing sound insulation test methods, electric speakers are placed in the reverberation chamber, pink noise or white noise is emitted to simulate the external sound ...

Claims

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Application Information

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IPC IPC(8): G01M10/00
Inventor 黄文超侯峰董宁娟庞彦宾张洪涛
Owner CHINA AIRPLANT STRENGTH RES INST