CHOOSING A SUITABLE SWEEP RATE FOR SINUSOIDAL VIBRATION TESTING
Abstract
Frequency-sweep vibration tests generally are conducted with a sweep rate that varies directly with the test frequency. The object is to pass through every resonance in the frequency range in such a manner that equal times are spent in each resonant bandwidth. The underlying assu ption is that the average Q (transmissibility) of the resonances may be considered the same through the entire frequency range of interest. It is argued that, in tests which employ a constant level of acceleration control, the average Q actually must increase with an increase in resonant frequency. Therefore, a suitable sweep rate must be one which changes with a fractional power of the test frequency, rather than with the first power. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 1961
- Accession Number
- AD0264026
Entities
People
- Neal Granick
Organizations
- National Aeronautics and Space Administration