Industrial Consultancy & Sponsored Research (IC&SR) , IIT Madras
System and Method for Predetermining the onset of Impending Oscillatory Instabilities in Practical Devices
Categories for this Invention
Technology: Predetermining the onset of
impending oscillatory instabilities in devices
Category: Assistive, Test Equipment & Design Manufacturing
Industry: Aviation, Aero acoustic
Application: Gas turbines, Jet engines
Market: The global market size was valued at US$ 1198.7 million in 2023 and is anticipated to reach US$ 2250 million by 2030, witnessing a CAGR of 9.3% during the forecast period 2024-2030.
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Problem Statement
- Oscillatory instabilities are critical in devices like gas turbines, jet engines, and industrial processing devices, causing performance losses, reduced operational range, and structural degradation.
- Detecting these instabilities is challenging.
- Techniques to control them include delay feedback controllers, combustor stability measurements, exhaust flow and fuel injection rate modulation, and a detector.
- However, these methods can increase NOx emissions and make it difficult to meet emission norms.
- Detecting aerodynamic and aeromechanical instabilities in turbofan engines can also be challenging due to similar issues.
- There is a need to predict instability and control device parameters to prevent system instability and improve stability margins.
Technology
- Providing a measuring device in communication with a practical device
- Generating signals corresponding to the dynamics of the practical device
- Determining stability of the practical device from the signals generated from the measuring device and estimating the amplitude of oscillatory instability
- Controlling the parameters of the practical device in accordance with the determined stability of the practical device
Key Features / Value Proposition
Sensors used
- Acoustic sensor, photodiode, and photomultiplier.
Device Proximity to Oscillatory Instabilities
- Performs 0-1 test, Burst count test, Hurst exponent test.
- Instability detection unit generates values between 0 and 1 based on instability amplitude and device proximity.
- Control unit generates values close to 1 for noisy/chaotic signals, 0 for oscillatory dynamics, and 0 and 1 for intermittent burst.
- Device dynamics signal generated using threshold logic circuit.
Hurst exponent test
- Generates values close to 0 for oscillatory dynamics and 0 and 1 for intermittent bursts.
Diagnosis of Intermittent bursts
- Using variations in fractality, multifractality, or recurrence quantification.
Application – Used to detect the impending oscillatory instabilities
- That proceed through the intermittent bursts in combustor, an industrial furnace, a burner, aeroacoustic systems, aero-elastic systems, aeromechanical systems, air-compression systems and any other device subjected to oscillatory instabilities.
Questions about this Technology?
Contact For Licensing
sm-marketing@imail.iitm.ac.in
ipoffice2@iitm.ac.in
Research Lab
Prof. Sujith RI
Department of Aerospace Eng.
Intellectual Property
IITM IDF Ref. 1734
Patent No: IN 535504
PCT/IN2019/050533
Technology Readiness Level
TRL- 3
Experimental Proof of concept;