公开(公告)号：US12062167B1

公开(公告)日：2024-08-13

申请号：US18398665

申请日：2023-12-28

Applicant: SHANDONG UNIVERSITY

Inventor： Mingshun Jiang ,  Lingyu Sun ,  Shanshan Lv ,  Juntao Wei ,  Lei Zhang ,  Faye Zhang ,  Qingmei Sui ,  Lei Jia

IPC: G06T7/77 ,  G06K9/00 ,  G06T5/20 ,  G06T5/70 ,  G06T7/00 ,  G06T7/73

CPC classification number: G06T7/001 ,  G06T5/20 ,  G06T5/70 ,  G06T7/74 ,  G06T7/77 ,  G06T2207/10132 ,  G06T2207/20076 ,  G06T2207/30108

Abstract: A probability multiply-sum structural damage imaging positioning method and system based on a delay factor includes obtaining optimal excitation frequency and group-velocity theoretical correction function based on numerical simulation of composite laminates; based on optimal excitation frequency, obtaining ultrasonic guided wave response signals of composite laminates in healthy and lossy states and sensor coordinates used for signal collection; performing path screening based on ultrasonic guided wave response signals; obtaining group-velocity correction function based on measured group velocity obtained based on ultrasonic guided wave response signal in healthy state, and calculating actual delay time based on obtained effective path, group-velocity correction function, and sensor coordinates; obtaining damage delay factor based on actual and reference delay time; forming path probability distribution based on damage delay factor, and performing path probability multiply-sum operation to obtain structural damage imaging result; and obtaining structural damage positioning result based on peak point coordinates of imaging result.

公开(公告)号：US12000799B1

公开(公告)日：2024-06-04

申请号：US18400246

申请日：2023-12-29

Applicant: SHANDONG UNIVERSITY

Inventor： Mingshun Jiang ,  Juntao Wei ,  Feiyu Teng ,  Shanshan Lv ,  Lingyu Sun ,  Lei Zhang ,  Faye Zhang ,  Qingmei Sui ,  Lei Jia

IPC: G01N29/24

CPC classification number: G01N29/2437

Abstract: A digital, self-diagnosis, sensing intelligent layer integrating active and passive monitoring, including: a capacitance testing unit, configured to charge a to-be-tested piezoelectric transducer by generating a step signal, and determine a transition moment, to obtain a free capacitance value of the to-be-tested piezoelectric transducer; a frequency testing unit, to charge the to-be-tested piezoelectric transducer by generating sinusoidal signals of different frequencies, and detect a resonant frequency according to the transition moment; an active and passive monitoring module, to obtain analog response signals in an active mode and a passive mode, and convert the analog response signals into digital response signals for transmission; and a main control module, to transmit a self-diagnosis result and the digital response signals to a guided wave host. The intelligent layer integrates active damage scanning and passive impact monitoring while implementing self-diagnosis for a piezoelectric transducer state.