Patent ID: 6810741
Filing Date: 2004-11-02
Classification: G01M

Abstract:
A method for determining a vibratory excitation spectrum tailored to physical characteristics of a structure having critical elements located thereon to be subjected to vibration testing, said physical characteristics including a frequency response function corresponding to a testing environment temperature and defined in term of power spectral density amplitude over a global excitation frequency range for said vibratory excitation spectrum and characterized by a plurality of power spectral density amplitude peaks corresponding to a plurality of natural resonance frequencies each being associated with respective mode shape and damping factor, the method comprising the steps of:i) locating as part of said global excitation frequency range at least one anti-resonance frequency range extending between two said natural resonance frequencies considered as main natural resonance frequencies; ii) defining on a basis of the amplitude peaks corresponding to said main natural resonance frequencies at least two corresponding sets of amplitude peaks each including the amplitude peak associated with any other said natural resonance frequency near corresponding said main natural resonance frequency included in said corresponding set; and iii) defining from said at least two sets of amplitude peaks at least two spectral profile sections associated with corresponding frequency ranges as part of said global excitation frequency range, each said spectral profile section being expressed as power spectral density amplitude according to the mode shape and damping factor associated with corresponding said main and any other natural resonance frequencies and to the location of said critical elements, to form a vibratory excitation spectrum capable of maximizing vibration power transfer to the critical elements of the structure to be subjected to vibration at said testing environment temperature.