Method for determining a vibratory excitation spectrum tailored to physical characteristics of a structure
US6810741B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 30, 2003 |
| Grant date | Nov 2, 2004 |
| Priority date | — |
| Expiry date | Apr 30, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01M7/022
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Methods for determining a vibratory excitation spectrum are tailored to physical characteristics of a structure having critical elements located thereon to be subjected to vibration testing, such as a PCB to which connectors, resistors, capacitors, inductances, Integrated Circuits (IC) or Ball Grid Array components (BGA) are mounted. The physical characteristics includes 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 the 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 comprises the steps of locating at least one anti-resonance frequency range extending between two main natural resonance frequencies, defining on the basis of the amplitude peaks corresponding to the main natural resonance frequencies at least two corresponding sets of amplitude peaks each including the amplitude peak associated with any other natural resonance frequency near corresponding…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.