| Autor: |
Trummel, Marc C., Wiksten, David B. |
| Zdroj: |
Journal of the Acoustical Society of America; 1967, Vol. 42 Issue 5, p1204-1205, 2p |
| Abstrakt: |
Spacecraft vibration caused by wide-band excitations may be subdivided into structurally related zones and presented a space average spectrum levels percentile spectrum levels, maximum envelopes, etc. In many cases, it is desirable or actually required to use frequency smoothed data such as the 13-oct band format. This requirement arises when predicting vibration levels on new spacecraft or structures by extrapolation from previous data or by analytic methods. Other applications occur in certain acoustic testing or case where only 13-oct data is available. As a final step in using broad-band frequency data, a peaking factor is required to estimate the narrow-band peaks to be expected. Empirical estimates of peaking factors are derived by analysis of vibration data from tests of two structurally dissimilar spacecraft: the MARINER and SURVEYOR. Data are analyzed and manipulated in 13-oct and narrow-band formats. Peaking factors are derived for: (1) a direct comparison of 13-oct and narrow-band data, (2) space averages of both types of data and, 3) 95th percentiles from sets of both types of data. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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