Patent ID: 11860066
Assignee: XI'AN JIAOTONG UNIVERSITY
Field: Measurement (Instruments)
Classification: CPC G  F | IPC F  G

Claim 6:
7. The method according to claim 6, wherein in the fifth step (S5), based on the conversion matrix T and the decoupled multimodal vibration signals ubtt,i(t), strains of all the nodes on a surface of and inside the blade at each turn of the rotor blade or at the moment t are calculated according to a formula S(t)=T[ubtt,1,ubtt,2, . . . ,ubtt,i, . . . ,ubtt,nm]T to obtain S(t)=[ε1,x,ε1,y,ε1,z,γ1,xy,γ1,yz,γ1,xz, . . . ,εi,x,εi,y,εi,z,γi,xy,γi,yz,γi,xz, . . . ,εnm,x, εnm,y, εnm,z, γnm,xy, γnm,yz, γnm,xz]T, and the strains S(t) comprise positive strains and shearing strains, wherein εi,x represents for a positive strain of the ith node of the finite element model of the blade in an x direction, εi,y represents for a positive strain of the ith node of the finite element model of the blade in a Y direction, εi,z represents for a positive strain of the ith node of the finite element model of the blade in a z direction, γi,xy represents for a shearing strain of the ith node of the finite element model of the blade in an x-y direction, γi,yz represents for a shearing strain of the ith node of the finite element model of the blade in a y-Z direction, γi,xz represents for a shearing strain of the ith node of the finite element model of the blade in an x-z direction, and the superscript T represents for the transposition of a vector.