4 results about "Nonlinear acoustics" patented technology

The present application relates to the technical field of intelligent sensor, specifically to a stainless steel pipe quality evaluation method and system based on detection response, comprising: constructing and emitting a specific phase encoding excitation flow, and collecting the response after the propagation in the stainless steel pipe; generating the response spectrum available for analysis by processing the response signal; determining two key physical performance parameters representing the material by analyzing the response spectrum: the bulk nonlinear acoustic characteristic value reflecting the microscopic physical properties, and the interface modulation acoustic characteristic value reflecting the structural integrity; finally, based on the comprehensive evaluation of the two determined physical performance parameters, the precise differentiation of the material physical property degradation and the internal structure discontinuity is realized. The present application can realize the synchronous analysis and evaluation of multiple physical performances of the material through one nondestructive testing.

The application discloses a choir balance guidance method and system based on voiceprint recognition, relates to the technical field of digital audio signal processing, and comprises the following steps: extracting acoustic energy features and ontology voiceprint matching features of a current time window of multiple pickup channels, and calculating time sequence change rates of both relative to historical time windows; performing orthogonal state deviation judgment based on the time sequence change rates, and locking a target pickup channel interfered by a howling sound; determining a howling sound emission source channel and an absolute propagation time delay by cross-correlation ranging within a preset time delay constraint range; inversely calculating a physical propagation distance according to the time delay, and constructing a spatial spectrum dissipation filter in combination with a nonlinear acoustic dissipation model; performing phase shift and frequency response deformation constraint on a frequency domain signal of the howling sound source by using the time delay and the filter, and generating a physically deformed howling sound prediction signal; performing targeted cancellation on the frequency domain signal of the target channel and the prediction signal, reconstructing a pure acoustic energy parameter, and generating a balance guidance instruction; and the application can solve the balance guidance distortion problem caused by howling sound aliasing.

This invention relates to a non-destructive testing method, system, and equipment for the burial depth of utility poles based on nonlinear acoustic features. The testing method includes: S1, applying a broadband transient impact excitation to the sidewall of a concrete utility pole to induce a vibration response in the dominant resonant mode; S2, simultaneously acquiring the force signal of the impact excitation and the acceleration signal of the vibration response to obtain a time-domain response signal; S3, extracting nonlinear acoustic features from the response signal, including at least one of higher harmonic features and resonant frequency shift features; S4, inputting the extracted nonlinear acoustic features into a calibrated regression model to output a quantitative index characterizing the degree of delamination damage at the steel-concrete interface in the concrete utility pole. This invention overcomes the limitation of existing linear acoustic methods, which can only qualitatively judge severe damage, and enables early detection and quantitative assessment of hidden damage such as early delamination and microcracks at the steel-concrete interface.

This invention belongs to the field of nonlinear acoustics technology, specifically relating to a method, program, equipment, and storage medium for calibrating the amplitude and phase consistency of parametric arrays. This invention determines and compensates for the difference-frequency amplitude and phase response of the high-frequency acoustic waves emitted by each array element, thereby enabling the calibration of the amplitude and phase consistency of parametric arrays in various experimental scenarios such as water tanks and anechoic chambers. This invention exhibits high robustness to installation errors, and the calibrated array elements possess a more consistent difference-frequency amplitude and phase response. The invention has a simple implementation, is applicable to various experimental scenarios, and provides necessary pre-calibration for beamforming of parametric arrays, possessing high application value.