In this the second part, the attention will he focused on the practical implementation of the techniques proposed in Part 1. Firstly, the problem of generating a periodic excitation signal with a specific spectrum in the experimental conditions will be solved by the use of a programmable signal analyzer. Secondly, using this spectral control technique and applying the generalized linear path identification method proposed in Part 1, two simple nonlinear structures are tested and analysed. Finally, the application of this new package of nonlinear system identification techniques is experimentally demonstrated on a multiple DOF structure. It includes the practical implementation of the spectral controller, the generalized linear path identification method, the practical location scheme of nonlinear elements and the in-situ nonlinear force state mapping technique.

Schoukens, J., Rolain, Y., Montecelli, L., and De Locht, C, “Identification of Linear Systems in the Presence of Non-Linear Distortions,” Proceedings of the 11th International Modal Analysts Conference, pp. 479–485, Florida, March 1993.
J. A.
, “
Effects of Structural Modes on Vibratory Force Determination by the Pseudoinverse Technique
AIAA Journal
, Vol.
, No.
, pp.
Hillary, B., and Ewins, D. J., “The Use of Strain Gauge in Force Determination and Frequency Response Function Measurements,” Proceedings of the 2nd International Modal Analysis Conference, pp. 627–634, 1984.
Starkey, J. M., and Merrill, G. L., “On the Ill-conditioned Nature of Indirect Force-Measurement Techniques,” International Journal of Analytical and Experimental Modal Analysis, pp. 103–108, July 1989.
Duym, S., and Schoukens, J., “Design of Excitation Signals for the Restoring Force Surface Method,” Mechanical Systems and Signal Processing, pp. 139–158, 1995.
Pressa, W. H., and et al. Numerical Recipes in FORTRAN, The Art of Scientific Computing, Cambridge University Press, 1992.
Schoukens, J., and Pintelon, R., Identification of Linear Systems, A Practical Guideline to Accurate Modeling, Pergamon Press, Oxford, 1991.
This content is only available via PDF.
You do not currently have access to this content.