ANALYSIS OF NON LINEAR STRUCTURE BY PROGRAMMED IMPACT TESTING AND HIGHER ORDER TRANSFER FUNCTION

摘要

Impulse excitation with special mechanical hammer actuated by electronic programmer is presented. Proposed devices circumvent the defects of hand actuated hammer and give isolated or repeated impulse force excitation with adjustable level and adjustable time delays between impulses. Attention is paid to second order transfer function to analyse nonlinearities. We suggest the second order Hilbert transform whose numerical computation uses multidimensional inverse Fourier transform with correcting terms.