The paper of McAdams et al. (ASME J. Appl. Mech. 74, pp. 191–202) explored two different approaches for damage detection in vibrating beams having both manufacturing variations in geometry and crack damage. One of the approaches, however, has a significant error in its formulation. The effects of this error on the formulation and the analytical results are discussed.

1.
McAdams
,
D. A.
,
Comella
,
D.
, and
Tumer
,
I. Y.
, 2007, “
Exploring Effective Methods for Simulating Damaged Structures With Geometric Variation: Toward Intelligent Failure Detection
,”
ASME J. Appl. Mech.
0021-8936,
74
, pp.
191
202
.
2.
Ismail
,
Z.
,
Abdul Razak
,
H.
, and
Abdul Raman
,
A. G.
, 2006, “
Determination of Damage Location in RC Beams Using Mode Shape Derivatives
,”
Eng. Struct.
0141-0296,
28
, pp.
1566
1573
.
3.
Gauthier
,
J. F.
,
Whalen
,
T. M.
, and
Liu
,
J.
, 2007, “
Experimental Validation of the Higher-Order Derivative Discontinuity Method for Damage Identification
,”
Structural Control and Health Monitoring
, in press. Available online at: http://www3.interscience.wiley.com/cgi-bin/jissue/108567152http://www3.interscience.wiley.com/cgi-bin/jissue/108567152
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