Method and system for calculating aerodynamic damping of turbomachinery based on multi-frequency excitation and frequency domain separation

By employing multi-frequency excitation and frequency domain separation, the problem of low efficiency in traditional aerodynamic damping calculations is solved, achieving efficient and accurate aerodynamic damping calculations and supporting the aeroelastic stability assessment of turbomachinery.

CN122197692APending Publication Date: 2026-06-12INST OF ENGINEERING THERMOPHYSICS - CHINESE ACAD OF SCI
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
INST OF ENGINEERING THERMOPHYSICS - CHINESE ACAD OF SCI
Filing Date
2026-02-12
Publication Date
2026-06-12

AI Technical Summary

⚠Technical Problem

Traditional aerodynamic damping calculation methods suffer from slow design iterations, high computational resource requirements, and low automation, making it difficult to meet the needs of rapidly evaluating the aeroelastic stability of turbomachinery.

⚗Method used

By employing a method based on multi-frequency excitation and frequency domain separation, a turbomachinery fluid domain structure model is established by determining the target parameters of multi-frequency excitation, performing unsteady numerical simulation, converting the unsteady pressure time-domain signal into a frequency-domain signal, obtaining the unsteady pressure amplitude of each frequency component, and calculating the single-cycle aerodynamic work and aerodynamic damping ratio.

🎯Benefits of technology

It significantly improves computational efficiency, reduces resource consumption, enables continuous analysis of damping characteristics over a wide frequency range, accurately captures critical flutter frequencies, avoids information loss, and allows for flexible and efficient parameter adjustment.

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Abstract

The application provides a kind of based on multi-frequency excitation and frequency domain separation's turbomachinery aerodynamic damping calculation method and system, belongs to turbomachinery technical field, including determining multi-frequency excitation target parameter, including modal shape and multiple target frequencies;Establish turbomachinery fluid domain structure model, combine modal shape, construct and implement multi-frequency vibration excitation;Execute unsteady numerical simulation, obtain blade surface unsteady pressure time domain signal;Convert unsteady pressure time domain signal into frequency domain signal, obtain the amplitude of unsteady pressure corresponding to each frequency component based on frequency domain signal;Based on the amplitude of unsteady pressure corresponding to each frequency component, obtain the single cycle aerodynamic work corresponding to each target frequency;Based on the single cycle aerodynamic work corresponding to each target frequency, obtain the aerodynamic damping ratio corresponding to each target frequency.The application effectively avoids the tedious process of multiple simulations in traditional single-frequency excitation method, improves the calculation efficiency and accuracy.
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