Dynamic characterization of bolted joints using FRF decoupling and optimization

Tol S., ÖZGÜVEN H. N.

MECHANICAL SYSTEMS AND SIGNAL PROCESSING, ss.124-138, 2015 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Basım Tarihi: 2015
  • Doi Numarası: 10.1016/j.ymssp.2014.08.005
  • Dergi Adı: MECHANICAL SYSTEMS AND SIGNAL PROCESSING
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.124-138
  • Anahtar Kelimeler: Joint dynamics, Dynamics of bolted connections, Structural joint modeling, Joint parameter identification, FRF decoupling, Experimental identification, SUBSTRUCTURE SYNTHESIS, IDENTIFICATION, PARAMETERS
  • Orta Doğu Teknik Üniversitesi Adresli: Evet

Özet

Mechanical connections play a significant role in predicting dynamic characteristics of assembled structures. Therefore, equivalent dynamic models for joints are needed. Due to the complexity of joints, it is difficult to describe joint dynamics with analytical models. Reliable models are generally obtained using experimental measurements. In this paper an experimental identification method based on FRF decoupling and optimization algorithm is proposed for modeling joints. In the method the FRFs of two substructures connected with a joint are measured, while the FRFs of the substructures are obtained numerically or experimentally. Then the joint properties are calculated in terms of translational, rotational and cross-coupling stiffness and damping values by using FRF decoupling. In order to eliminate the numerical errors associated with matrix inversion an optimization algorithm is used to update the joint values obtained from FRF decoupling. The validity of the proposed method is demonstrated with experimental studies with bolted joints. (C) 2014 Elsevier Ltd. All rights reserved.