Noise qualification approval equivalent test flight method of large transport-category aircraft

A transport aircraft and certification technology, applied in the field of effective flight test, can solve the problems of wasting manpower, material resources, affecting flying characters, and wasting flight sorties, etc., and achieves the effect of flexible selection, reduction of engine life, and construction cost savings.

Inactive Publication Date: 2014-04-30
CHINESE FLIGHT TEST ESTAB
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AI Technical Summary

Problems solved by technology

[0002] The noise certification test flight of large transport aircraft has not yet been carried out in China. The original test method needs to arrange 12 noise measurement points near the airport. During the flyover and lateral noise measurement, the aircraft takes off at the maximum takeoff weight and maximum takeoff power each time. During the test, the approach noise measurement, the aircraft must perform the landing test at the maximum landing weight
And this method needs to fly at the test airport itself, which will affect other flying characters at the airport
Twelve noise measurement points need to be arranged in the test, and each noise measurement point needs to be constructed and equipped with test instrument personnel, which wastes a lot of manpower and material resources
In the test, it is required that the aircraft must take off at the maximum take-off weight or land at the maximum landing weight, and conduct a noise measurement, which wastes a lot of flight sorties, and the flight test cycle is long

Method used

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  • Noise qualification approval equivalent test flight method of large transport-category aircraft

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Example 1: Fly-by noise measurement

[0033] a) Arrange three noise measurement points near the airport, two lateral measurement points S1 and S2, and one overflight measurement point C;

[0034] b) Predetermine the reference flight path of the aircraft passing over the noise measurement point, see image 3 .

[0035] c) After the aircraft takes off from the field and reaches the sky above the noise measurement point, go around according to the pre-determined flight path and engine power, and measure the noise of the lateral and overflight noise measurement points;

[0036] d) According to the requirements of CCAR36, judge the validity of test results in real time;

[0037] e) Data processing

[0038] First calculate the flyover noise EPNL of each actual flight altitude, and then correct the flyover noise EPNL to the reference track flight altitude of 1200ft, see Table 1. Then correct the EPNL at the flight altitude of 1200ft to the reference condition (D=6500m, H=2...

Embodiment 2

[0046] Example 2: Lateral Noise Measurement

[0047] a) Arrange three noise measurement points near the airport, two lateral measurement points S1 and S2, and one overflight measurement point C;

[0048] b) Predetermine the lateral noise reference flight path of the aircraft passing over the noise measurement point, see Figure 4 .

[0049] c) After the aircraft takes off from the field and reaches the sky above the noise measurement point, go around according to the pre-determined flight path and engine power, and measure the noise at the lateral noise measurement point;

[0050] d) According to the requirements of CCAR36, judge the validity of test results in real time;

[0051] e) Data processing

[0052] First, calculate the EPNL of the measured power at the two lateral noise measurement points according to the lateral noise test. The results are shown in Table 4 and Table 5. The relationship curve between the aircraft height and EPNL is determined by quadratic fitting,...

Embodiment 3

[0067] Example 3: Approach noise measurement

[0068] a) Arrange a noise measurement point near the airport, the approach noise measurement point;

[0069] b) Predetermine the approach reference for the aircraft passing over the noise measurement point, see Figure 5 ;

[0070] c) After the aircraft takes off from the field and reaches the sky over the noise measurement point, it conducts a go-around according to the pre-determined flight track and engine power, and the noise of the approach noise measurement point;

[0071] d) According to the requirements of CCAR36, judge the validity of test results in real time;

[0072] e) Data processing.

[0073] First, calculate the approach noise EPNL at each actual flight altitude, then correct the approach noise EPNL to the reference track flight altitude of 394ft, and then perform the quadratic fitting of the engine power and EPNL to obtain the approach noise level and confidence interval of 90 % confidence level, the approach ...

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Abstract

The invention belongs to the aircraft test flight technology, and particularly relates to a noise qualification approval equivalent test flight method of a large transport-category aircraft. The noise qualification approval equivalent test flight method of the large transport-category aircraft includes the steps of symmetrically setting three noise measurement points in the direction perpendicular to the center extension line of an airport ground track, carrying out an airworthiness noise flight test with a flight path plunge method, after the aircraft takes off, entering flight path plunge points to set the engine power, the flight height and the flight speed, carrying out the flight test according to a reference flight path, measuring noise when the aircraft reaches the preset height above the noise measurement points, going around to pull up the aircraft after noise measurement is completed, and repeatedly carrying out a next flight test, wherein in the whole test process, the aircraft keeps flying all the time. According to the noise qualification approval equivalent test flight method, the noise measurement points are greatly reduced, required noise test devices and required test persons are greatly reduced, cost is reduced, the test flight efficiency is improved, the test flight cycle is greatly shortened, the service life of an engine is prolonged, a test site is flexibly selected, and flight tasks of aircrafts in other types in the site can not be influenced.

Description

Technical field: [0001] The invention belongs to aircraft flight test technology, in particular to an equivalent flight test method for noise qualification certification of large transport aircraft. Background technique: [0002] The noise certification test flight of large transport aircraft has not yet been carried out in China. The original test method needs to arrange 12 noise measurement points near the airport. During the flyover and lateral noise measurement, the aircraft takes off at the maximum takeoff weight and maximum takeoff power each time. During the test and approach noise measurement, the aircraft must perform a landing test at the maximum landing weight. Moreover, this method needs to fly at the test airport itself, which will affect other flying characters at the airport. Twelve noise measurement points need to be arranged in the test, and each noise measurement point requires basic construction and testing instrument personnel, which wastes a lot of manp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01H17/00
Inventor 刘选民梁相文张跃林张晓亮宋国智李新霞李小路
Owner CHINESE FLIGHT TEST ESTAB
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