Systemic solutions
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Automobile Industry
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Low Noise Solution For Intake And Exhaust Systems
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Interior Product Performance Optimization And Cost Reduction Solutions
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Low Noise Solution For Hydrogen Fuel Cell System
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Low Noise Solution For Vehicle Electric Drive System
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Low Noise Solution For Vehicle Air Conditioning System
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Vehicle Damping Layout Optimization And Lightweight Solutions
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Aviation Industry
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Material Industry
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Other Industry
Systematic solutions for aviation noise index decomposition and index setting
1. Introduction to the background of noise in aircraft cabins
1.1 Main sources of noise in aircraft cabins and suppression solutions
The main noises of concern are divided into several categories: engine airborne sound, turbulent boundary layer (TBL) noise, engine structural sound and air conditioning noise:
· Sound sources outside the cabin: engine airborne sound, TBL and other aerodynamic noise sources:
· The noise reduction effect on the sound source side can be obtained through the sound load test on the surface of the aircraft wall panel structure.
· Sound source in the cabin: noise from the air-conditioning system;
· Suppress cabin noise by reducing noise from the air-conditioning system.
· Wall panel sound insulation:
· By improving the sound insulation capability of aircraft wall panels, the impact of sound sources outside the cabin on cabin noise can be suppressed;
· The balance between lightweight and high sound insulation is the main breakthrough point in wall panel design.
Extravehicular noise source
In-cabin noise source: air conditioning system
Aircraft wall panel sound insulation: lightweight, high sound insulation
1.2 The importance of indicator decomposition and indicator setting:
· Indicator decomposition/setting:
· Gradually decompose the indicators at the whole aircraft level into each subsystem;
· Purpose: to guide the design and development of each subsystem or aircraft wall panel;
· Method: There are various methods of indicator decomposition and need to be based on The industrial development level, cost, weight and performance of the subsystem are comprehensively scheduled.
Vibration and noise decomposition/setting theory method
Aircraft indicator setting (trade-off analysis and accurate setting method)
2. BOACH acoustic index decomposition and index setting systematic solutions:
· Solution for rapid prediction of noise sources
· Currently, it can provide sound source model construction such as turbofan noise, jet noise, turboprop noise, rotor noise, TBL, etc. ·
Solution for rapid prediction of wall plate transfer function:
· Based on analytical methods and Engineering experience provides a rapid prediction analysis model for wall panel sound insulation, which is used to build transfer functions.
· Rapid cabin noise estimation and index setting system solutions.
2.1 Solution for rapid estimation of noise sources
·Noise source model construction :
· Based on TBL theory, obtain TBL noise source data;
· Provide customers with customized sound source model construction of turbofans, turboprops, rotors and other aircraft;
· Theoretical basis: Theoretical basis of aerodynamic noise.
propeller noise
TBL sound source
jet sound source
Other sound sources
2.2 Rapid estimation solution for wall panel transfer function
· Provide customers with customized wall panel sound insulation rapid estimation and analysis software;
· Based on the BOACH material database (actual measurement results), set wall panel sound insulation and index settings for the customer's actual model engineering service.
Rapid prediction system for aviation siding sound insulation
2.3 Solution for rapid estimation and index setting of cabin noise
· Rapid estimation of cabin noise based on external sound sources and wall plate transfer functions, combined with the linear principle of load and transfer function;
· Rapid estimation of cabin noise based on the estimation results Make indicator settings.
Systematic cabin noise prediction and indicator setting
3. Systematic solution for setting apron noise indicators
· Based on the principle of noise propagation, BOACH Acoustics has also expanded its apron noise rapid prediction and index decomposition engineering services;
· It can effectively predict the aircraft-level apron noise quickly for the APU system and environmental control system, and set the silencer and sound source noise reduction indicators.
4. Engineering technical service cases of various models
· At present, BOACH Acoustics has provided relevant engineering and technical services for many domestic models.
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Room 901, Building 1, Phase 2, Yungu Phase 2, Fengxi New Town, Xixian New District, Xixian New District, Xi'an City, Shaanxi Province
Room 307, Building 1, Harbin Institute of Technology Robot Industrial Park, No. 488 Qianjin East Road, Economic Development Zone, Kunshan City, Jiangsu Province
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