Damage collaborative diagnosis technology based on multi-frequency-domain response signals

A technology of response signal and diagnosis technology, which is applied in the field of health monitoring of aerospace honeycomb sandwich thermal protection structure, can solve the problems of single monitoring technology, achieve the effect of broadening the frequency domain of response signal and saving energy

Pending Publication Date: 2021-10-08
DALIAN UNIV OF TECH +1
View PDF7 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, a single monitoring technology is used, which fails to achieve multi-technical fusion in each response frequency domain of the structure, and there is a certain degree of limitation in damage monitoring. Therefore, there is an urgent need for a multi-frequency domain response signal that can be used in cellular sandwich structures. Injury Collaborative Diagnosis Technology

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Damage collaborative diagnosis technology based on multi-frequency-domain response signals
  • Damage collaborative diagnosis technology based on multi-frequency-domain response signals
  • Damage collaborative diagnosis technology based on multi-frequency-domain response signals

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0034] Embodiment: Using the method disclosed in the present invention to carry out an embodiment of multi-frequency domain collaborative damage monitoring of a honeycomb sandwich thermal protection structure, the specific diagnosis process includes:

[0035] First, the material of the honeycomb sandwich structure in this example is aluminum alloy, and the material density is 2.7g / cm 3 , elastic modulus 70GPa, Poisson's ratio 0.33, the geometric parameters of each layer are shown in Table 1. Polyimide film encapsulation of distributed optical sensors and piezoelectric sensors, as well as connecting circuits and circuit lights, integrating distributed optical fiber sensor networks between the skin panel and the honeycomb core, and between the strain isolation pad and the skin panel Integrated piezoelectric sensor arrays, such as figure 2 shown. Sensor layout position and preset damage settings such as image 3 , a distributed optical fiber sensor and 9 piezoelectric sensors...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
densityaaaaaaaaaa
elastic modulusaaaaaaaaaa
Poisson's ratioaaaaaaaaaa
Login to view more

Abstract

The invention discloses a damage collaborative diagnosis technology based on a multi-frequency-domain response signal. The technology comprises the following steps: real-time low-frequency quasi-static strain monitoring can be carried out on a honeycomb sandwich multilayer thermal protection structure by adopting a distributed optical fiber sensor; a piezoelectric ceramic sensor is used for carrying out high-frequency ultrasonic guided wave active detection, polyimide film packaging is carried out on a sensor network and a connecting circuit, a distributed optical fiber sensor network is integrated between a skin panel and a honeycomb core, and a piezoelectric sensor array is integrated between a strain isolation pad and the skin panel; and the structure state is monitored in real time by comprehensively utilizing low-frequency quasi-static strain and high-frequency ultrasonic guided wave response, and when the structure state is abnormal, damage diagnosis is performed by adopting a high-frequency ultrasonic guided wave active detection method.

Description

technical field [0001] The invention relates to the field of health monitoring of aerospace honeycomb sandwich thermal protection structures, in particular to a damage collaborative diagnosis technology based on multi-frequency domain response signals. Background technique [0002] Reusable hypersonic vehicles have the characteristics of horizontal take-off and landing, wide-area flight, and repeated use, which will have a revolutionary impact on future air-space integrated operations. The aircraft requires its thermal protection system to be reusable under high overspeed reentry conditions, and is facing a huge challenge of high lightweight and high safety design. The honeycomb sandwich thermal multi-layer protective structure is a thermal protective structure that meets the above requirements. It is a multi-layer thermal insulation structure connected by heat-insulating honeycomb aluminum and panels, heat-resistant foam and other substrates through high-temperature resista...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/04G01B11/16
CPCG01N29/04G01B11/165G01N2291/0234
Inventor 武湛君李建乐黄念马寅魏张佳奇徐浩
Owner DALIAN UNIV OF TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap