CN103063402A - 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 PDFInfo
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- CN103063402A CN103063402A CN201210528272XA CN201210528272A CN103063402A CN 103063402 A CN103063402 A CN 103063402A CN 201210528272X A CN201210528272X A CN 201210528272XA CN 201210528272 A CN201210528272 A CN 201210528272A CN 103063402 A CN103063402 A CN 103063402A
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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
The invention belongs to aero-acoustics test field, relate to a kind of test unit for simulation whirlpool oar properller air-flow and line spectrum noise.
Background technology
Whirlpool oar aircraft is in flight course, and the screw propeller High Rotation Speed can produce huge line spectrum noise and gas, impacts on fuselage skin, has a strong impact on the acoustic enviroment in the aircraft cabin, destroys to sit and takes advantage of comfortableness.Therefore by in the outside sound field of test lab simulation aircraft, carry out the wall panel structure sound insulation test, design the wall panel structure of high oise insulation factor, be the common method of control aircraft cabin noise always.
In existing sound insulation test mode, all adopt and in reverberation chamber, place dynamic loudspeaker, emission pink noise or white noise come the outside sound field of simulated aircraft, carry out the wall panel structure sound insulation test.Because be subject to self restriction of dynamic loudspeaker, reverberation chamber, the sound field of simulation can not effectively 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 simulate whirlpool oar properller line spectrum noise and gas in order to solve, reach the raising experimental accuracy, effectively carry out the purpose of whirlpool oar Aircraft Acoustics design, noise-reducing design, the invention provides a kind of test unit that utilizes pivoting leaf dish shear flow sounding, by control leaf disc spin speed, control noise frequency and gas simulate screw propeller air-flow in the oar aircraft flight process of whirlpool/line spectrum noise truly, have solved the problem that original method exists.
Summary of the invention
Goal of the invention: can't simulate in the oar aircraft flight process of whirlpool not yet screw propeller air-flow/line spectrum noise problem in order to solve existing test unit, reach the purpose that improves experimental accuracy, the invention provides a kind of simple in structure, control accuracy is high, the test unit that is used for simulation whirlpool oar properller air-flow/line spectrum noise of good reliability.
Technical scheme: a kind of test unit for simulation whirlpool oar properller air-flow and line spectrum noise, the airflow line 5 that comprises fixed support 1, is installed on the gear train 2 of fixed support 1, pivoting leaf dish 3 with holes and is connected with external air source 4, described gear train 2 drives rotating shaft 7 by driving belt 6 and drives pivoting leaf dish 3 rotations with holes, 3 are provided with several internal diameters gas port 8 consistent with airflow line 5 internal diameters on the described pivoting leaf dish with holes, and gas port 8 was coaxial with airflow line 5 after described pivoting leaf dish 3 with holes was installed on fixed support 1.
Preferably, in airflow line 5, also be provided with a flow rate measuring device 9, be used for the monitoring gas velocity.
Preferably, described gear train 2 is variable-frequency motor.
Preferably, also be provided with for the frequency converter 10 of controlling variable-frequency motor.
Preferably, described several gas ports 8 are uniformly distributed on the pivoting leaf dish 3 with holes.
Beneficial effect: the present invention has simulated the noise field of corresponding region, oar properller plane, whirlpool and pneumatic comparatively really with simple structure under prior art condition and test condition, effectively simulate the line spectrum noise of screw propeller.Source of the gas intensity by regulating described external air source 4 and the velocity of rotation of described pivoting leaf dish 3 with holes can accurately be controlled sound pressure level and the frequency distribution that this test unit produces noise according to different demands.Find that by Experimental Comparison test unit can produce the line spectrum noise with frequency multiplication relation, and this noise is in full accord in frequency distribution with propeller noise to be simulated, overall sound pressure level and each frequency sound pressure level difference are in 5%.The present invention is easy to operate, laborsaving to save time, reusable, advantage that reliability is higher, effective guarantee the wallboard sound insulation test rationally, reliable.Therefore, practicality is better, is easy to apply, and has larger practical value.
Description of drawings
Fig. 1 is the embodiment of the invention 1 structural representation;
Fig. 2 is the embodiment of the invention 2 structural representations;
Fig. 3 is the present invention's operating position Imitating sound field spectra figure;
Fig. 4 is true noise pattern under the present invention's operating position.
Wherein, the 1-fixed support, the 2-gear train, 3-pivoting leaf dish with holes, the 5-airflow line, the 6-driving belt, the 7-rotating shaft, the 8-gas port, the 9-flow velocity is surveyed device.
Embodiment
Below in conjunction with accompanying drawing the present invention is done to describe in further detail, see also Fig. 1 to Fig. 4.
Embodiment 1: as shown in Figure 1, a kind of test unit for simulation whirlpool oar properller air-flow and line spectrum noise, the airflow line 5 that comprises fixed support 1, is installed on the gear train 2 of fixed support 1, pivoting leaf dish 3 with holes and is connected with external air source 4, described gear train 2 drives rotating shaft 7 by driving belt 6 and drives pivoting leaf dish 3 rotations with holes, 3 are provided with several internal diameters gas port 8 consistent with airflow line 5 internal diameters on the described pivoting leaf dish with holes, and gas port 8 was coaxial with airflow line 5 after described pivoting leaf dish 3 with holes was installed on fixed support 1.Gas port 8 on the pivoting leaf dish 3 with holes is consistent with the internal diameter of airflow line 5, in the time of can guaranteeing that pivoting leaf dish with holes 3 rotates, realizes that the high velocity air introduced 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, thereby changes the rotating speed of pivoting leaf dish 3 with holes, adjusts the speed of cutting high velocity air.
Preferably, also be provided with the frequency converter 10 for the control variable-frequency motor, the running frequency that changes motor can be regulated the angular velocity of rotation of leaf dish with holes and the frequency of cutting steam, thereby changes the frequency of analogue noise.
Preferably, described several gas ports 8 are uniformly distributed on the pivoting leaf dish 3 with holes, can make air-flow pass through gas port in the identical time interval, guarantee unicity and the accuracy of noise frequency.
Preferably, described pivoting leaf dish 3 with holes has several internal diameters gas port 8 consistent with airflow line 5 internal diameters, and it is installed on fixed support 1, and gas port 8 is coaxial with airflow line 5 afterwards.Can guarantee like this when gas port 8 through over against airflow line 5 time, the air flow energy in the airflow line 5 is fully by pivoting leaf dish 3 with holes; And when pivoting leaf dish 3 with holes was rotated further, the air flow energy in the airflow line 5 was blocked very soon; Can guarantee that like this noise that produces when air-flow is cut is that disperse, sharp-pointed single-frequency in frequency distribution, and the frequency multiplication relation is arranged between each frequency, make itself and propeller noise more approaching.
As shown in Figures 3 and 4, the comparison diagram for forming in certain test.Can find out by the contrast for the treatment of the true noise spectrum that analogue noise frequency and this device produce under certain use state among Fig. 3 and Fig. 4, the noise that this device produces with treat that analogue noise is in full accord in frequency distribution, be that fundamental frequency is 107.5Hz, second order frequency is 215Hz, three order frequencies are 322.5Hz, the quadravalence 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 in 5%; Can simulate accurately air-flow and line spectrum noise that screw propeller produces, have very high practical value.
The present invention has simulated the noise field of corresponding region, oar properller plane, whirlpool and pneumatic comparatively really with simple structure under prior art condition and test condition, effectively simulate the line spectrum noise of screw propeller.Source of the gas intensity by regulating described external air source 4 and the velocity of rotation of described pivoting leaf dish 3 with holes can accurately be controlled sound pressure level and the frequency distribution that this test unit produces noise according to different demands.Find that by Experimental Comparison test unit can produce the line spectrum noise with frequency multiplication relation, and this noise is in full accord in frequency distribution with propeller noise to be simulated, overall sound pressure level and each frequency sound pressure level difference are in 5%.The present invention is easy to operate, laborsaving to save time, reusable, advantage that reliability is higher, effective guarantee the wallboard sound insulation test rationally, reliable.Therefore, practicality is better, is easy to apply, and has larger practical value.
Claims (5)
1. test unit that is used for simulation 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 with holes [3] and the airflow line [5] that is connected with external air source [4], described gear train [2] drives rotating shaft [7] by driving belt [6] and drives pivoting leaf dish with holes [3] rotation, be provided with several internal diameters gas port [8] consistent with airflow line [5] internal diameter on the described pivoting leaf dish with holes [3], described pivoting leaf dish with holes [3] is installed on fixed support [1], and gas port [8] is coaxial with airflow line [5] afterwards.
2. a kind of test unit for simulation whirlpool oar properller air-flow and line spectrum noise according to claim 1 is characterized in that, also is provided with a flow rate measuring device [9] in airflow line [5], is used for the monitoring gas velocity.
3. a kind of test unit for simulation whirlpool oar properller air-flow and line spectrum noise according to claim 1 and 2 is characterized in that described gear train [2] is variable-frequency motor.
4. want 3 described a kind of test units for simulation whirlpool oar properller air-flow and line spectrum noise according to right, it is characterized in that, also be provided with the frequency converter [10] for the control variable-frequency motor.
5. a kind of test unit for simulation 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 the pivoting leaf dish with holes [3].
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103592090A (en) * | 2013-10-15 | 2014-02-19 | 中国科学院光电研究院 | Method for testing vibration of high-altitude propeller and vibration of support of high-altitude propeller on ground |
| CN104443348A (en) * | 2014-12-15 | 2015-03-25 | 中国飞机强度研究所 | Design method for improving acoustic performance of anti-icing panel of turbo-propeller plane |
| CN104986354A (en) * | 2015-06-23 | 2015-10-21 | 中国航空工业集团公司西安飞机设计研究所 | Reusable tilting rotorcraft test stand |
| CN106017914A (en) * | 2016-05-11 | 2016-10-12 | 湖南科技大学 | Research and testing platform for vibration noises of helicopter transmission system |
| CN106796780A (en) * | 2014-09-23 | 2017-05-31 | 亚马逊技术股份有限公司 | Vehicles Noise measarement and communication |
| 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 |
| CN112964452A (en) * | 2021-02-08 | 2021-06-15 | 中国科学院力学研究所 | Variable-attack-angle hydrofoil experiment model for cutting free surface |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103592090A (en) * | 2013-10-15 | 2014-02-19 | 中国科学院光电研究院 | Method for testing vibration of high-altitude propeller and vibration of support of high-altitude propeller on ground |
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| CN104986354A (en) * | 2015-06-23 | 2015-10-21 | 中国航空工业集团公司西安飞机设计研究所 | Reusable tilting rotorcraft test stand |
| 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 |
| CN106017914A (en) * | 2016-05-11 | 2016-10-12 | 湖南科技大学 | Research and testing platform for vibration noises of helicopter transmission system |
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| 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 |
| CN112964452A (en) * | 2021-02-08 | 2021-06-15 | 中国科学院力学研究所 | Variable-attack-angle hydrofoil experiment model for cutting free surface |
| 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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|---|---|
| CN103063402B (en) | 2015-05-27 |
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