6 results about "Micro damage" patented technology

The application discloses a component fatigue micro-damage early identification method based on a nonlinear static component, and particularly relates to the technical field of material nondestructive testing and structural health monitoring, which comprises the following steps: arranging an excitation probe and a receiving probe on the surface of a component to be measured; selecting an excitation frequency based on a frequency dispersion curve and generating a Hanning window modulated wave; collecting a propagation response signal; extracting a static component amplitude A and a fundamental wave amplitude A through time-frequency processing; calculating a nonlinear static parameter beta=A / A²; further calculating a first derivative S(N) and a second derivative ΔS(N) of beta with respect to a fatigue loading cycle N; and identifying a dislocation dominant stage, a dislocation saturation or rearrangement stage, a micro-crack initiation stage and a macro-crack formation stage according to the first derivative S(N) and the second derivative ΔS(N). The application can be used for early stage identification of the evolution process of component fatigue micro-damage.

This invention discloses a nonlinear Lamb wave detection method for micro-damage in plate structures based on a flexible sensor array, belonging to the field of nondestructive testing technology. The method includes: generating a sinusoidal modulated excitation signal using a Hanning window; extracting nonlinear characteristic parameters reflecting micro-damage in the plate structure from the preprocessed signal using time-frequency analysis and empirical mode decomposition algorithms; generating a fused damage probability map based on compressed sensing theory and the extracted nonlinear characteristic parameters; constructing a damage distribution profile in the thickness direction by analyzing the penetration depth differences of Lamb waves at different frequencies; and automatically quantifying and analyzing the identified damage areas to obtain the damage detection results. This invention aims to achieve early identification and precise localization of micro-damage in plate structures, effectively overcoming the shortcomings of low sensitivity and inaccurate localization in traditional detection methods, and significantly improving detection accuracy, efficiency, and automation.

This invention discloses a method for identifying the edge of micro-motion damage in ancient building structures based on lightweight deep learning, belonging to the field of cultural heritage protection. The method includes: micro-motion perception fusion, employing a high-sensitivity accelerometer and micro-displacement laser measurement to achieve dual-mode perception of "dynamic mode + static deformation"; signal preprocessing; lightweight time-frequency analysis network identification, generating time-frequency spectra from acceleration samples through continuous wavelet transform, inputting them into the lightweight time-frequency analysis network LTFANet, and outputting modal parameters and variation characteristics; crack propagation trend analysis; structural damage index calculation, fusing multi-source information to calculate a physically interpretable structural damage index (SDI); graded early warning, pushing early warning information based on a four-level threshold system; and early warning verification. This invention achieves high-precision perception and real-time edge identification of micro-damage in ancient buildings, with high early warning accuracy, and is applicable to immovable cultural relics such as ancient pagodas and wooden structures.

The present application relates to an online repair method of a high environmental adaptability composite material cabin door, and relates to the technical field of aerospace equipment manufacturing. The existing composite material cabin door manufacturing process cannot realize multi-performance regional customization, the repair means lags behind and cannot cope with the technical problems of internal micro-damage in extreme environment. The present application realizes the integration of structure bearing, health monitoring, self-repair and adaptive sealing through multifunctional skin preparation, honeycomb core co-curing, intelligent monitoring system integration, self-adaptive sealing component installation and quick replacement connection structure assembly. In the preparation stage, the vacuum bag pressure and hot press co-curing combined process is adopted to simplify the process and reduce energy consumption; in the repair stage, the distributed optical fiber sensor is used to monitor the structure state in real time, when the abnormality is detected, the shape memory alloy wire is heated to make the embedded microcapsule break and release the repair agent, and the micro-damage self-repair is completed. The present application is applied to the repair of the composite material cabin door.

This invention relates to the field of enameled wire production technology and discloses an enameled wire coating mold with self-cleaning and micro-damage repair functions, solving the problem of poor coating effect of bare copper wire. The mold includes a mold body, with a repair and cleaning mechanism at its end. The repair and cleaning mechanism has a rotating mechanism. The repair and cleaning mechanism includes a mounting ring located on the outside of the mold body. Multiple L-shaped pillars are fixedly connected at equal angles between the mounting ring and the end of the mold body. A slider is movably sleeved on the outside of each L-shaped pillar. Arc-shaped plates are fixedly connected to the front and rear positions of the mounting ring away from the mold body, and arc-shaped plates are fixedly connected to the upper and lower positions of the mounting ring near the mold body. This invention uses two brushes (one and two) to scrape away impurities from the surface of the bare copper wire, thereby improving the coating effect of the bare copper wire.

The application discloses a kind of micro-damage self-repairing polyester fiber sound absorption board and preparation method thereof, it is related to high molecular sound-absorbing material technical field.The sound absorption board includes polybutylene terephthalate, modified polybutylene succinate self-repairing microparticle, hollow three-dimensional curly polyester fiber, porous inorganic sound-absorbing filler, foaming agent, compatible agent, antioxidant and lubricant by mass fraction;The self-repairing microparticle has the core-shell-interface modification structure of low-melting-point polyester repair core layer, dopamine-silica hybrid intermediate layer and silane reactive outer layer.The sound absorption board has good sound-absorbing performance, interface bonding stability and micro-damage repair capacity.