公开(公告)号：US20230251160A1

公开(公告)日：2023-08-10

申请号：US17628765

申请日：2021-07-26

Applicant: DALIAN UNIVERSITY OF TECHNOLOGY

Inventor： Xing FU ,  Qing ZHANG ,  Liang REN ,  Hongnan LI

IPC: G01M5/00

CPC classification number: G01M5/0041 ,  G01M5/0025 ,  E04H12/10

Abstract: The present invention belong to the technical field of lattice tower structure monitoring, and discloses a displacement reconstruction method for a lattice tower structure based on improved mode superposition. The method comprises: uniformly arranging D strain sensors on main member of a lattice tower along the height, processing collected strain data {ε}D×1 using a stochastic subspace identification (SSI) method to obtain a matrix [Ψ]D×nT of first n-order strain modes;
calculating a function relation y(x) between a distance from a measuring point to a neutral layer and a height according to a lattice tower design drawing; performing polynomial fitting on the first n-order strain modes with a height coordinate x of the lattice tower respectively to obtain a strain mode function Ψi(x), expanding a function






Ψ
i

(
x
)


y
⁡
(
x
)





according to a Taylor formula, performing double integration on the expansion result and substituting same into a boundary condition, to obtain a displacement mode function Φi(x); evaluating a modal coordinate {q}n×1 by means of the least square method, substituting the height coordinate x of a displacement object point to be reconstructed, and multiplying the displacement mode function value Φi(x) by the modal coordinate {q}n×1. The improved mode superposition method of the present invention has the advantages of a small number of sensors required, simple calculation process, accurate calculation result, and strong operability and practicality.

公开(公告)号：US20210033480A1

公开(公告)日：2021-02-04

申请号：US16963158

申请日：2019-07-16

Applicant: DALIAN UNIVERSITY OF TECHNOLOGY

Inventor： Liang REN ,  Jiajian WANG

IPC: G01L11/02

Abstract: A non-destructive monitoring method for internal pressure intensity of a pipeline. The method establishes an equation relationship by the fact that the variation of the internal diameter of the pipeline is the same as that measured by FBG sensors, and can effectively obtain the value of the internal pressure intensity of the pipeline by measuring the strain values of the FBG sensors installed on the pipeline so as to monitor the internal pressure intensity of the pipeline. The present invention has the advantages of simple principle, convenient installation, no damage to pipeline structure, long-distance real-time on-line monitoring and the like, and can measure the pressure intensity of various pipelines with different diameters by changing the calibration distance of sensors and the dimension of sensor clamps. This can complete non-destructive, real-time and accurate monitoring on the internal pressure intensity of the pipeline.

公开(公告)号：US20230273090A1

公开(公告)日：2023-08-31

申请号：US17772654

申请日：2021-09-03

Applicant: DALIAN UNIVERSITY OF TECHNOLOGY

Inventor： Xing FU ,  Qing ZHANG ,  Liang REN

IPC: G01M7/02

CPC classification number: G01M7/02

Abstract: The present invention belongs to the field of monitoring technology and signal analysis of lattice tower structures, and discloses a horizontal two-dimensional displacement reconstruction method for a lattice tower structure based on multi-source heterogeneous data fusion. a lattice tower is simplified into a thin-walled three-dimensional variable section cantilever beam, a two-dimensional strain-displacement mapping method is used to calculate the horizontal two-dimensional displacement with low sampling rate, and finally a multi-rate Kalman filter algorithm is used to fuse the displacement with horizontal two-dimensional acceleration to obtain the horizontal two-dimensional displacement with high sampling rate. A data fusion method of the present invention needs less sensors, is simple in calculation process and accurate in calculation results, and has strong operability and practicability.