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Aircraft engine noise simulation synthesis audible method, system and device

An aircraft engine and noise simulation technology, which is applied in the field of aircraft, can solve the problem that the aircraft engine noise cannot be simulated very accurately

Active Publication Date: 2019-05-21
CIVIL AVIATION UNIV OF CHINA
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  • Abstract
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AI Technical Summary

Problems solved by technology

The synthesis of noise is based on aircraft noise prediction data, which does not include the changes or fluctuations in the operating state of the aircraft and the engine during actual operation, so it cannot simulate the noise of the aircraft engine very accurately

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  • Aircraft engine noise simulation synthesis audible method, system and device
  • Aircraft engine noise simulation synthesis audible method, system and device
  • Aircraft engine noise simulation synthesis audible method, system and device

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Embodiment Construction

[0048] In order to further understand the content, features and effects of the present invention, the following examples are given, and detailed descriptions are given below with reference to the accompanying drawings.

[0049] The structure of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0050] see figure 1 , one A method for auralization of aircraft engine noise simulation synthesis, comprising:

[0051] Step 1, read the input file, the input file contains the information of aircraft and noise-related parts, digital signal processing (Digital Signal Processor, DSP) parameters, low-frequency oscillation (low-frequency oscillator, LFO) (<20Hz) parameters, aircraft flight trace data and listener position;

[0052] Step 2, preprocessing the input file. After reading the input file, the program runs in a double-buffering scheme using a prepare chain executed on time buffer i-1, and a compositing / mixing / output chain ...

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Abstract

The invention discloses an aircraft engine noise simulation synthesis audible method, system and device, and belongs to the technical field of aircrafts, and the method comprises the steps: 1, readingan input file; 2, preprocessing the input file; 3, calculating the total sound pressure level of each 1 / 3 frequency band of the broadband noise; 4, carrying out short-time fast Fourier transform on the empirical data, analyzing and deriving low-frequency oscillation, and modulating the amplitude of the 1 / 3 frequency band sound pressure level by using the low-frequency oscillation; 5, synthesizingbroadband noise of the aircraft through a subtraction synthesis method; 6, calculating the frequency and the amplitude of each single tone and harmonic waves thereof; 7, independently modulating theamplitude and frequency of each single tone by using low-frequency oscillation; 8, performing single-tone noise synthesis; 9, superposing the broadband signal and the single-tone noise signal of the aircraft; and 10, adding direction-related gain and absolute time delay as well as time delay and gain corresponding to diffusion loss and atmospheric absorption to the aircraft noise signal generatedin the synthesis stage.

Description

technical field [0001] The invention belongs to the technical field of aircraft, and in particular relates to an aircraft engine noise simulation synthesis audible method, system and device. Background technique [0002] Engines and landing gear are the main sources of noise during aircraft flight. The engine, in turn, is a major contributor to the variance in noise levels between aircraft. The FAA is currently adopting a new noise standard for certain newly certified subsonic jet and subsonic transport category large aircraft. This noise standard, known as the Stage 5 noise standard, applies to all new aircraft type designs with a maximum certified takeoff weight of 121,254 pounds (55,000 kg) submitted before December 31, 2017; or December 31, 2020 New aircraft type designs with a previously submitted maximum certified takeoff weight of less than 121,254 pounds (55,000 kg). This change lowers the required noise limits for newly certified aircraft and brings the noise cer...

Claims

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Application Information

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IPC IPC(8): G01H17/00G01M15/14
Inventor 张青闫国华田硕
Owner CIVIL AVIATION UNIV OF CHINA
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