Novel method for recognizing rigidity between shearing type structure layers under environmental excitation

An environmental excitation and shear type technology, which is applied in the field of structural physical parameter identification, can solve problems such as difficult measurement and non-repeatable environmental excitation, and achieve the effects of improving efficiency, facilitating computer program implementation, and suppressing noise interference

Inactive Publication Date: 2010-10-27
BEIJING UNIV OF TECH
View PDF1 Cites 14 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, engineering structures in reality are often large-scale, and it is almost impossible to achieve artificial excitation, so it is a promising method to use the structural response under environmental excitation (such as ground pulse, traffic load, wind load, etc.) for parameter identification. But environmental stimuli are generally not repeatable and difficult to measure

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
  • Novel method for recognizing rigidity between shearing type structure layers under environmental excitation
  • Novel method for recognizing rigidity between shearing type structure layers under environmental excitation
  • Novel method for recognizing rigidity between shearing type structure layers under environmental excitation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Take the shear structure with the number of degrees of freedom n=6 as an example (such as figure 2 ), carry out the numerical simulation for the identification of the stiffness between layers, because the vibration magnitude of the environmental excitation is very small, it can be considered that the structure is in a state of linear vibration. The basic parameters of the structure are given in Table 1, the proportional damping is assumed, and the damping ratio is taken as 0.02. The environmental excitation acting on the substrate is simulated by a white noise acceleration signal with a bandwidth of 0.5Hz to 40Hz, and the maximum amplitude of the substrate acceleration is 5×10 4 m / s 2, take 8000 sampling points, the sampling interval is 0.01s, such as image 3 As shown, the Wilson-θ method is used to solve the acceleration response of each layer of the structure under environmental excitation.

[0038] Table 1 Basic parameters of the structural model

[0039]

...

Embodiment 2

[0049] Taking the shear structure model with the number of degrees of freedom n=10 as an example, the identification method proposed by the present invention is tested and verified. The height between layers of the model is 250mm, the length and width of each layer of steel plates are 400mm, and the thickness is 6mm. The four columns between each layer are made of φ6 steel rods, and the steel rods are welded to the upper and lower steel plates. One acceleration sensor is arranged along the horizontal one-way on each layer of steel plate, totaling 10. The mass estimate for each layer is 4kg.

[0050] Due to the small size of the model, the geometric deviation in the manufacturing process has a great influence on the inter-story stiffness of the structure. Therefore, the inter-story stiffness value calculated by the design parameters is not accurate enough, and the accurate value of the inter-story stiffness of the model needs to be obtained through actual measurement. .

[00...

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

No PUM Login to view more

Abstract

The invention relates to a novel method for recognizing the rigidity between shearing type structure layers under environmental excitation. Firstly, the free vibration response of a structure is replaced by a cross correlation function of the structure acceleration response under environmental excitation by using a natural excitation technology; then an equation is decoupled by using the free vibration of the shearing type structure, and a vibration equation of the multidegree of freedom shearing type structure represented by the cross correlation function of the acceleration response is decomposed into a forced vibration equation of a plurality of single degree of freedom systems under the action of corresponding virtual dynamic loads; and finally the physical parameter recognition is carried out on each single degree of freedom system under the action of virtual dynamic loads by using the extended kalman filter algorithm to obtain a recognition value of the rigidity between the shearing type structure layers. The invention only needs to collect the vibration response of each shearing type structure layer, can recognize the rigidity between the layers relatively and accurately, has better prospect of engineering application, can be used for safety detection and health monitoring of a building with a mechanical model, such as, a rigid frame, a frame, and the like being simplified into a shearing type model.

Description

technical field [0001] The invention belongs to the field of identification of physical parameters of structures, and in particular relates to a new method for identification of interlayer stiffness of shear-type structures under environmental excitation conditions, which is mainly applied to the construction of buildings whose mechanical models such as rigid frames and frames can be simplified to shear-type models. Safety detection and health monitoring. Background technique [0002] Physical parameter identification is one of the core issues of structural inspection and health monitoring research. According to the change of physical parameters (especially stiffness), it is possible to directly determine whether the structure is damaged and the location and degree of damage. In the actual engineering of structural health monitoring, the available excitation methods are often limited to environmental excitation. Under such excitation conditions that are difficult to observe,...

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): G01N3/00E04B1/19
Inventor 闫维明王卓杨小森
Owner BEIJING 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