Viscoelasticity parameter inversion method and related equipment
By equating the shear wave group velocity to the phase velocity anchor point under the zero-frequency limiting condition and combining it with the phase velocity dispersion curve in the mid-to-high frequency band for single-parameter fitting, the problems of insufficient parameter coupling and stability in the viscoelastic parameter inversion in the prior art are solved, thereby improving the accuracy and reliability of viscoelastic parameter inversion.
Patent Information
- Application Number
- CN202610576483.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-04-28
- Publication Date
- 2026-05-29
- Estimated Expiration
- 2046-04-28
AI Technical Summary
In existing viscoelastic parameter inversion methods, the lack of low-frequency information leads to insufficient constraints on the rheological model by the phase velocity dispersion curve in the mid-to-high frequency range, resulting in severe parameter coupling, insufficient inversion stability, and low accuracy of viscoelastic parameter inversion.
The time-of-flight method is used to extract the shear wave group velocity, which is equivalent to the phase velocity anchor point under the zero-frequency limit condition. The two-dimensional fast Fourier transform is combined to extract the phase velocity dispersion curve in the mid-to-high frequency band. The rheological model is constrained based on the static shear modulus, and the viscosity coefficient is fitted by a single parameter.
By introducing constraint information from low-frequency responses, the degree of parameter coupling is reduced, improving the stability and accuracy of viscoelastic parameter inversion and enhancing the reliability of the inversion results.