Aircraft Engine Noise Reduction via Alternative Power Spool Control
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Solution Overview
Problem
Aircraft engines contribute significantly to noise pollution, necessitating the development of effective noise reduction technologies to comply with aviation regulations and community noise standards, particularly during takeoff and landing operations.
Innovation Solution
A controller system is employed to manage alternative power sources, such as fuel cells or batteries, to adjust the rotational speeds of the high and low pressure spools within the engine, combined with variable engine geometries, to reduce noise levels while maintaining thrust. This involves transferring power from the low pressure spool to the high pressure spool and optimizing compressor operating points to minimize fan noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If alternative power sources are used to adjust spool speeds and geometries, then engine noise is reduced, but device complexity increases
Solution Approach 1:
The system dynamically adjusts spool speeds and engine geometries in real-time during flight phases based on noise sensitivity conditions. The controller modifies operating parameters such as fan blade pitch, compressor inlet guide vane angles, and spool rotational speeds to optimize noise reduction while maintaining thrust requirements.
Solution Approach 2:
The invention changes key operating parameters including spool rotational speeds, fan blade pitch angles, compressor inlet guide vane angles, and alternative power source output levels. By varying these parameters across different flight phases and noise sensitivity conditions, the system achieves noise reduction without sacrificing engine performance.
2Object-generated harmful factors
If spool speeds are adjusted to reduce noise, then community noise is reduced, but thrust output may be compromised
Solution Approach 1:
The system dynamically balances noise reduction and thrust maintenance by continuously adjusting spool speeds and geometries based on real-time flight conditions and noise sensitivity conditions. During takeoff and landing phases, the controller optimizes the trade-off between reduced fan noise and maintained thrust output.
Solution Approach 2:
The invention integrates multiple power sources (primary fuel-based power and alternative electric power from fuel cells or batteries) to work together as a composite power system. This allows independent optimization of noise reduction through alternative power source adjustment while maintaining total thrust output through coordinated control of both power sources.
3Adaptability or versatility
If alternative power sources are integrated into the engine system, then noise control capability is improved, but device complexity increases
Solution Approach 1:
The alternative power source is designed to serve multiple functions: noise reduction during takeoff and landing, maintenance of thrust output, and potential backup capability. The controller integrates the alternative power source with the existing engine control system, allowing it to perform noise control functions while working cooperatively with the primary power system.
Solution Approach 2:
The system incorporates feedback mechanisms where the controller continuously monitors noise sensitivity conditions, flight phase, and engine operating parameters to adjust alternative power source output and spool speeds accordingly. This closed-loop control enables adaptive noise reduction while maintaining thrust requirements.
Data Source
AI summary
An aircraft engine includes a low pressure spool, a high pressure spool, and an alternative power source. The alternative power source is configured to add power to the high pressure spool. A controller is configured to determine a noise sensitive condition; and control, in response to determining the noise sensitive condition, the alternative power source to add power to the high pressure spool.