Sensitivity-based operational mode shape normalisation: Application to a bridge

Recently, an innovative sensitivity-based technique was introduced for the normalisation of operational mode shapes purely on a basis of output-only data. The technique is based on the use of a controlled mass modification experiment and does not involve any analytical models. Moreover, it allows to extend the applicability of many modal analysis based applications towards the domain of in-operation modal testing. Previously, this method was successfully tested by means of experiments on various mechanical engineering structures. The focus of this contribution is the validation of the sensitivity-based normalisation technique on a civil structure. For this purpose, measurements were performed on a bridge.

[1]  A. K. Pandey,et al.  Damage Detection in Structures Using Changes in Flexibility , 1994 .

[2]  E. Parloo,et al.  Maximum likelihood identification of modal parameters from non-stationary operational data , 2001 .

[3]  Bart Peeters,et al.  Comparison of ambient and Forced Vibration Testing of civil engineering structures , 1999 .

[4]  A. Benveniste,et al.  MERGING SENSOR DATA FROM MULTIPLE MEASUREMENT SET-UPS FOR NON-STATIONARY SUBSPACE-BASED MODAL ANALYSIS , 2002 .

[5]  Yitshak M. Ram,et al.  Dynamic structural modification , 2000 .

[6]  E. Parloo,et al.  Maximum likelihood identification of non-stationary operational data , 2003 .

[7]  Richard B. Nelson,et al.  Simplified calculation of eigenvector derivatives , 1976 .

[8]  Robert B. Randall,et al.  DETERMINATION OF FREQUENCY RESPONSE FUNCTIONS FROM RESPONSE MEASUREMENTS—II. REGENERATION OF FREQUENCY RESPONSE FROM POLES AND ZEROS , 1996 .

[9]  D. J. Ewins,et al.  Structural Modification Analysis using Rayleigh Quotient Iteration , 1989 .

[10]  C. S. Rudisill,et al.  Derivatives of Eigenvalues and Eigenvectors for a General Matrix , 1974 .

[11]  Paul Sas,et al.  Modal Analysis Theory and Testing , 2005 .

[12]  Charles R. Farrar,et al.  Computation of structural flexibility for bridge health monitoring using ambient modal data , 1996 .

[13]  L. Hermans,et al.  MODAL TESTING AND ANALYSIS OF STRUCTURES UNDER OPERATIONAL CONDITIONS: INDUSTRIAL APPLICATIONS , 1999 .

[14]  E. Parloo,et al.  Increased reliability of reference-based damage identification techniques by using output-only data , 2004 .

[15]  Subhash Garg,et al.  Derivatives of Eigensolutions for a General Matrix , 1973 .

[16]  E. Parloo,et al.  AUTONOMOUS STRUCTURAL HEALTH MONITORING—PART II: VIBRATION-BASED IN-OPERATION DAMAGE ASSESSMENT , 2002 .

[17]  Raj Nataraja.  Structural Integrity Monitoring in Real Seas , 1983 .

[18]  L. C. Rogers.  Derivatives of eigenvalues and eigenvectors , 1970 .

[19]  Jan Swevers,et al.  Modelling of sprayer boom dynamics by means of maximum likelihood identification techniques, part 1: A comparison of input-output and output-only modal testing , 2003 .

[20]  Raymond H. Plaut,et al.  Derivatives of eigenvalues and eigenvectors in non-self-adjoint systems. , 1973 .

[21]  E. Parloo,et al.  Force identification by means of in-operation modal models , 2002 .

[22]  Bart Peeters,et al.  System identification and damage detection in civil engineering , 2000 .

[23]  J. Swevers,et al.  Updating modal models from response measurements , 1998 .

[24]  Nuno M. M. Maia,et al.  Theoretical and Experimental Modal Analysis , 1997 .

[25]  M. R. Ashory.  Correction of Mass-loading Effects of Transducers and Suspension Effects in Modal Testing , 1998 .

[26]  Patrick Guillaume,et al.  Maximum likelihood identification of modal parameters from operational data , 1999 .

[27]  E. Parloo,et al.  SENSITIVITY-BASED OPERATIONAL MODE SHAPE NORMALISATION , 2002 .

[28]  Robert B. Randall,et al.  DETERMINATION OF FREQUENCY RESPONSE FUNCTIONS FROM RESPONSE MEASUREMENTS—I. EXTRACTION OF POLES AND ZEROS FROM RESPONSE CEPSTRA , 1996 .

[29]  J. Decker,et al.  Correction of Transducer-loading Effects in Experimental Modal Analysis , 1995 .

[30]  J. Deweer,et al.  Obtaining a scaled modal model of panel type structures using acoustic excitation , 1999 .

[31]  P. Verboven,et al.  Identification of modal parameters from inconsistent data , 2002 .

[32]  C. K. Yuen,et al.  Digital spectral analysis , 1979 .

[33]  L. Hermans,et al.  Modal parameter estimation from inconsistent data sets , 2000 .

[34]  Jan Swevers,et al.  Modelling of sprayer boom dynamics by means of maximum likelihood identification techniques, part 2: Sensitivity-based mode shape normalisation , 2003 .

[35]  Michael W. Kehoe,et al.  A historical overview of flight flutter testing , 1995 .

[36]  J. M. N. Silva,et al.  Some applications of coupling/uncoupling techniques in structural dynamics. Part 1: Solving the mass cancellation problem , 1997 .

[37]  Nam-Sik Kim,et al.  Effect of vehicle mass on the measured dynamic characteristics of bridges from traffic-induced vibration test , 2001 .

[38]  R. Fox,et al.  Rates of change of eigenvalues and eigenvectors. , 1968 .

[39]  Simon Roberts.  Identification of the modal parameters affecting automotive ride characteristics , 2001 .

[40]  Patrick Vanhonacker,et al.  Differential and Difference Sensitivities of Natural Frequencies and Mode Shapes of Mechanical Structures , 1980 .