Notes

• NOTE 1 The MMIF is given as a frequency dependent eigenvalue problem: where: [A] = [B] = is the real part of the FRF is the imaginary part of the FRF is the force eigenvector is the mass matrix l is an eigenvalue.
• NOTE 2 The MMIF comprises the eigenvalues resulting from the solution of the eigenvalue problem for each frequency
• NOTE 3 MMIF = 0 indicates a perfectly excited mode shape
• NOTE 4 MMIF >> 0 indicates either no resonances in the frequency range or inappropriately excited modes.
• NOTE 5 The MMIF yields a set of exciter force patterns that can best excite the real normal modes. It is therefore a simple but effective method to check the adequacy of the selected exciter locations.