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TRANSCRIPT
The study of optimal sensor placement for estimation of modal parameters
* **
Byung-kyoo Jung, Weui-bong Jeong and Jae-ho Kim
,
.
.
,
. ,
impact test
,
.
.
EFI DPR, EVP
.
.
EFI-DPR Kammer(1991) EFI
(effective independence) Imamovic(1994)
;E-mail : [email protected] : (051)510-2337, Fax : (051)517-3805
ADPR(average driving point residue)
(1) .
(1)
, FEM
,
.
.
EVP(eigenvalue vector product)
(2) .
(2)
(nodal lines)
EFI-DPR
.
(genetic algorithm)
.
fitness
function ,
fitness function
-159-부산대학교 | IP: 164.125.62.72 | Accessed 2015/12/30 11:31(KST)
(condition number)
(3), (4) .
(3)
( )
.
8 .
Fig.1 .
0 100 200 300 400 500 6000
50
100
150
200
250
300
350
400
Fig.1 Optimal sensor placement
( : EFI-DPR, : EVP, : Genetic algorithm)
EFI DPR, EVP,
(GA)
.
2
FRF ,
.
LSCF(least square complex frequency)
,
. Auto-MAC(modal
assurance criterion)
,
Table 1~3 .
Table 1 Comparison of natural frequency (Hz)Mode 1st 2nd 3rd 4th 5th
Analysis 43.685 84.046 135.254 151.878 175.241
EFI-DPR 43.686 84.045 135.259 151.884 175.221
EVP 43.685 84.046 135.253 151.888 175.220
GA 43685 84.046 135.254 151.879 175.239
Table 2 Comparison of modal damping (%)Mode 1st 2nd 3rd 4th 5th
Analysis 0.664 0.282 1.761 1.950 1.193
EFI-DPR 0.666 0.282 1.763 1.943 1.186
EVP 0.663 0.282 1.758 1.940 1.181
GA 0.664 0.282 1.761 1.949 1.190
Table 3 Sum of off-diagonal of Auto-MACAnalysis EFI-DPR EVP GA
Auto-MAC(Mode=1~5) 0.0 1.670 0.0944 0.3585
Auto-MAC(Mode=1~10) 0.0 9.2567 4.5553 3.2866
Table 1 2
,
1%
. Auto-MAC
, EVP GA
EFI DPR
.
GA EVP
.
EFI DPR,
EVP, GA
.
. ,
1% ,
GA
.
(No. UD110035DD) .
-160-부산대학교 | IP: 164.125.62.72 | Accessed 2015/12/30 11:31(KST)