Identification of system parameters and input force from output only

A method based on sensitivity of structural responses is presented for identifying both the system parameters and the input excitation force of a structure. Both sinusoidal and impulsive forces are studied. In the inverse analysis, a short length of measurement from only one or two accelerometers is...

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Published inMechanical systems and signal processing Vol. 21; no. 5; pp. 2099 - 2111
Main Authors Lu, Z.R., Law, S.S.
Format Journal Article
LanguageEnglish
Published London Elsevier Ltd 01.07.2007
Elsevier
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Abstract A method based on sensitivity of structural responses is presented for identifying both the system parameters and the input excitation force of a structure. Both sinusoidal and impulsive forces are studied. In the inverse analysis, a short length of measurement from only one or two accelerometers is required, and an iterative gradient-based model updating method based on the dynamic response sensitivity is adopted. The location of the input force is assumed known in the identification. The poor identification with the relatively insensitive parameters in a mixture of parameters with different sensitivities is addressed and solved with another loop of optimization. Validity of the proposed method is demonstrated with two numerical simulations and verified with laboratory results from a simply supported steel beam.
AbstractList A method based on sensitivity of structural responses is presented for identifying both the system parameters and the input excitation force of a structure. Both sinusoidal and impulsive forces are studied. In the inverse analysis, a short length of measurement from only one or two accelerometers is required, and an iterative gradient-based model updating method based on the dynamic response sensitivity is adopted. The location of the input force is assumed known in the identification. The poor identification with the relatively insensitive parameters in a mixture of parameters with different sensitivities is addressed and solved with another loop of optimization. Validity of the proposed method is demonstrated with two numerical simulations and verified with laboratory results from a simply supported steel beam.
Author Lu, Z.R.
Law, S.S.
Author_xml – sequence: 1
  givenname: Z.R.
  surname: Lu
  fullname: Lu, Z.R.
  organization: School of Engineering, Sun Yat-sen University, Guangzhou, Guangdong Province, People's Republic of China
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  givenname: S.S.
  surname: Law
  fullname: Law, S.S.
  email: cesslaw@polyu.edu.hk
  organization: Civil and Structural Engineering Department, Hong Kong Polytechnic University, Hunghom, Kowloon, Hong Kong, People's Republic of China
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Issue 5
Keywords Response
Inverse analysis
Sensitivity
Identification
Damage
Regularization
Vibration
Length measurement
Iterative method
Simple support
Metal
Steel
Modeling
Optimization
Inverse problem
Model matching
Accelerometer
System identification
Gradient method
Damaging
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Snippet A method based on sensitivity of structural responses is presented for identifying both the system parameters and the input excitation force of a structure....
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SubjectTerms Damage
Exact sciences and technology
Fracture mechanics (crack, fatigue, damage...)
Fundamental areas of phenomenology (including applications)
Identification
Inverse analysis
Measurement and testing methods
Physics
Regularization
Response
Sensitivity
Solid mechanics
Structural and continuum mechanics
Vibration, mechanical wave, dynamic stability (aeroelasticity, vibration control...)
Title Identification of system parameters and input force from output only
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Volume 21
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