CN103063402B - Testing device used for simulating propeller airflow and line spectrum noise of turboprop aircraft - Google Patents

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

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Publication number
CN103063402B
CN103063402B CN201210528272.XA CN201210528272A CN103063402B CN 103063402 B CN103063402 B CN 103063402B CN 201210528272 A CN201210528272 A CN 201210528272A CN 103063402 B CN103063402 B CN 103063402B
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line spectrum
simulating
holes
spectrum noise
noise
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CN103063402A (en
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黄文超
侯峰
董宁娟
庞彦宾
张洪涛
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AVIC Aircraft Strength Research Institute
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AVIC Aircraft Strength Research Institute
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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

A kind of test unit for simulating whirlpool oar properller air-flow and line spectrum noise
Technical field
The invention belongs to aero-acoustics test field, relating to a kind of test unit for simulating whirlpool oar properller air-flow and line spectrum noise.
Background technology
Whirlpool oar aircraft is in flight course, and screw propeller High Rotation Speed, can produce huge line spectrum noise and gas, impact on fuselage skin, have a strong impact on the acoustic enviroment in aircraft cabin, destroys seat and takes advantage of comfortableness.Therefore by testing lab simulation aircraft exterior sound field, carrying out wall panel structure sound insulation test, designing the wall panel structure of high oise insulation factor, be the common method controlling aircraft cabin noise always.
In existing sound insulation test mode, all adopt and place dynamic loudspeaker in reverberation chamber, transmitting pink noise or white noise carry out the outside sound field of simulated aircraft, carry out wall panel structure sound insulation test.Owing to being subject to self restriction of dynamic loudspeaker, reverberation chamber, the sound field of simulation effectively can not simulate the situations such as real screw propeller line spectrum noise and gas, and then affects the work such as wall panel structure acoustic design.
How effectively whirlpool oar properller line spectrum noise and gas is simulated in order to solve, reach raising experimental accuracy, effectively carry out the object of whirlpool oar Aircraft Acoustics design, noise-reducing design, the invention provides a kind of test unit utilizing pivoting leaf dish shear flow sounding, by controlling leaf disc spin speed, control noises frequency and gas, simulate the prop-blast/line spectrum noise in the oar aircraft flight of whirlpool truly, solve original method Problems existing.
Summary of the invention
Goal of the invention: not yet prop-blast/line spectrum noise problem cannot to be simulated in the oar aircraft flight of whirlpool in order to solve existing test unit, reaching and improve the object of experimental accuracy, the invention provides that a kind of structure is simple, control accuracy is high, the test unit for simulating whirlpool oar properller air-flow/line spectrum noise of good reliability.
Technical scheme: a kind of test unit for simulating whirlpool oar properller air-flow and line spectrum noise, comprise fixed support 1, be installed on the gear train 2 of fixed support 1, pivoting leaf dish 3 with holes and the airflow line 5 that is connected with external air source 4, described gear train 2 drives rotating shaft 7 to drive pivoting leaf dish 3 with holes to rotate by driving belt 6, on described pivoting leaf dish with holes, 3 are provided with several internal diameters gas port 8 consistent with airflow line 5 internal diameter, and described pivoting leaf dish 3 with holes is installed on fixed support 1, and gas port 8 is coaxial with airflow line 5 afterwards.
Preferably, in airflow line 5, a flow rate measuring device 9 is also provided with, for monitoring gas velocity.
Preferably, described gear train 2 is variable-frequency motor.
Preferably, the frequency converter 10 for controlling variable-frequency motor is also provided with.
Preferably, several gas ports 8 described are uniformly distributed on pivoting leaf dish 3 with holes.
Beneficial effect: the present invention, under prior art condition and test condition, simulates the noise field of oar properller plane corresponding region, whirlpool and pneumatic field comparatively really by simple structure, effectively simulates the line spectrum noise of screw propeller.By regulating the velocity of rotation of the source of the gas intensity of described external air source 4 and described pivoting leaf dish 3 with holes, can accurately control according to different demands sound pressure level and the frequency distribution that this test unit produces noise.Found by Experimental Comparison, test unit can produce the line spectrum noise with frequency multiplication relation, and this noise is with to wait to simulate propeller noise completely the same in frequency distribution, and overall sound pressure level and each frequency sound pressure level difference are within 5%.
The present invention is easy to operate, laborsaving to save time, reusable, reliability is higher advantage, effective guarantee wallboard sound insulation test reasonable, reliable.Therefore, practicality is better, is easy to apply, has larger practical value.
Accompanying drawing explanation
Fig. 1 is the embodiment of the present invention 1 structural representation;
Fig. 2 is the embodiment of the present invention 2 structural representation;
Fig. 3 is the present invention's service condition Imitating sound field spectra figure;
Fig. 4 is real noise spectrogram under the present invention's service condition.
Wherein, 1-fixed support, 2-gear train, 3-pivoting leaf dish with holes, 5-airflow line, 6-driving belt, 7-rotating shaft, 8-gas port, 9-flows quick test device.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail, refers to Fig. 1 to Fig. 4.
Embodiment 1: as shown in Figure 1, a kind of test unit for simulating whirlpool oar properller air-flow and line spectrum noise, comprise fixed support 1, be installed on the gear train 2 of fixed support 1, pivoting leaf dish 3 with holes and the airflow line 5 that is connected with external air source 4, described gear train 2 drives rotating shaft 7 to drive pivoting leaf dish 3 with holes to rotate by driving belt 6, on described pivoting leaf dish with holes, 3 are provided with several internal diameters gas port 8 consistent with airflow line 5 internal diameter, and described pivoting leaf dish 3 with holes is installed on fixed support 1, and gas port 8 is coaxial with airflow line 5 afterwards.Gas port 8 on pivoting leaf dish 3 with holes is consistent with the internal diameter of airflow line 5, and when can ensure that pivoting leaf dish 3 with holes rotates, the high velocity air realizing introducing from external air source 4 is to the cutting of gas port 8.
Described gear train 2 is variable-frequency motor.The benefit of variable-frequency motor is to change motor speed, thus changes the rotating speed of pivoting leaf dish 3 with holes, the speed of adjustment cutting high velocity air.
Preferably, be also provided with the frequency converter 10 for controlling variable-frequency motor, the running frequency changing motor can regulate the angular velocity of rotation of leaf dish with holes and the frequency of cutting steam, thus changes the frequency of analogue noise.
Preferably, several gas ports 8 described are uniformly distributed on pivoting leaf dish 3 with holes, can make air-flow in the identical time interval by gas port, ensure unicity and the accuracy of noise frequency.
Preferably, the gas port 8 that described pivoting leaf dish 3 with holes has several internal diameters consistent with airflow line 5 internal diameter, after being installed on fixed support 1, gas port 8 is coaxial with airflow line 5.Can ensure when gas port 8 is when just to airflow line 5 like this, the air flow energy in airflow line 5 is completely by pivoting leaf dish 3 with holes; And when pivoting leaf dish 3 with holes is rotated further, the air flow energy in airflow line 5 is stopped very soon; The noise produced when can ensure that air-flow is cut like this is discrete, sharp-pointed single-frequency in frequency distribution, and has frequency multiplication relation between each frequency, makes itself and propeller noise more close.
Embodiment 2, is also provided with a flow rate measuring device 9, for monitoring gas velocity in airflow line 5.
As shown in Figures 3 and 4, the comparison diagram for being formed in certain test.By treating under certain using state in Fig. 3 and Fig. 4 that the contrast of the real noise frequency spectrum that analogue noise frequency and this device produce can be found out, this device produce noise with treat that analogue noise is completely the same in frequency distribution, namely fundamental frequency is 107.5Hz, second order frequency is 215Hz, three order frequencies are 322.5Hz, fourth order frequency is 430Hz, and five order frequencies are 537.5Hz, and six order frequencies are 645Hz; Overall sound pressure level and each frequency sound pressure level difference are within 5%; Air-flow and the line spectrum noise of screw propeller generation can be simulated accurately, there is very high practical value.
The present invention, under prior art condition and test condition, simulates the noise field of oar properller plane corresponding region, whirlpool and pneumatic field comparatively really by simple structure, effectively simulates the line spectrum noise of screw propeller.By regulating the velocity of rotation of the source of the gas intensity of described external air source 4 and described pivoting leaf dish 3 with holes, can accurately control according to different demands sound pressure level and the frequency distribution that this test unit produces noise.Found by Experimental Comparison, test unit can produce the line spectrum noise with frequency multiplication relation, and this noise is with to wait to simulate propeller noise completely the same in frequency distribution, and overall sound pressure level and each frequency sound pressure level difference are within 5%.The present invention is easy to operate, laborsaving to save time, reusable, reliability is higher advantage, effective guarantee wallboard sound insulation test reasonable, reliable.Therefore, practicality is better, is easy to apply, has larger practical value.

Claims (5)

1. one kind for simulating the test unit of whirlpool oar properller air-flow and line spectrum noise, it is characterized in that, comprise fixed support [1], be installed on the gear train [2] of fixed support [1], pivoting leaf dish [3] with holes and the airflow line [5] be connected with external air source [4], described gear train [2] drives rotating shaft [7] to drive pivoting leaf dish [3] with holes to rotate by driving belt [6], described pivoting leaf dish [3] with holes is provided with several internal diameters gas port [8] consistent with airflow line [5] internal diameter, after described pivoting leaf dish [3] with holes is installed on fixed support [1], when pivoting leaf dish [3] with holes is rotated, each gas port [8] all can be coaxial with airflow line [5].
2. a kind of test unit for simulating whirlpool oar properller air-flow and line spectrum noise according to claim 1, is characterized in that, is also provided with a flow rate measuring device [9], for monitoring gas velocity in airflow line [5].
3. a kind of test unit for simulating whirlpool oar properller air-flow and line spectrum noise according to claim 1 and 2, it is characterized in that, described gear train [2] is variable-frequency motor.
4. wanting a kind of test unit for simulating whirlpool oar properller air-flow and line spectrum noise described in 3 according to right, it is characterized in that, being also provided with the frequency converter [10] for controlling variable-frequency motor.
5. a kind of test unit for simulating whirlpool oar properller air-flow and line spectrum noise according to claim 4, is characterized in that, described several gas ports [8] are uniformly distributed on pivoting leaf dish [3] with holes.
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CN103592090B (en) * 2013-10-15 2016-05-25 中国科学院光电研究院 A kind of method in ground test high-altitude screw and mount vibration thereof
US10013900B2 (en) * 2014-09-23 2018-07-03 Amazon Technologies, Inc. Vehicle noise control and communication
CN104443348B (en) * 2014-12-15 2017-02-22 中国飞机强度研究所 Design method for improving acoustic performance of anti-icing panel of turbo-propeller plane
CN104986354B (en) * 2015-06-23 2017-04-19 中国航空工业集团公司西安飞机设计研究所 Reusable tilting rotorcraft test stand
CN106017914B (en) * 2016-05-11 2018-11-16 湖南科技大学 A kind of Helicopter Transmission System Vibration Noise Study test platform
CN110779678A (en) * 2019-11-07 2020-02-11 中国航空工业集团公司哈尔滨空气动力研究所 Test bed capable of synchronously measuring aerodynamic characteristics and acoustic characteristics of large-size propeller
CN112729487A (en) * 2020-12-28 2021-04-30 中国航天空气动力技术研究院 Test calibration system and method for precession vortex flowmeter
CN112964452B (en) * 2021-02-08 2022-10-21 中国科学院力学研究所 Variable-attack-angle hydrofoil experiment model for cutting free surface

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