公开(公告)号：US12044601B2

公开(公告)日：2024-07-23

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 ,  E04H12/10

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.