Random vibration induced load is an important component of the total design load environment for payload and launch vehicle components and their support structures. The current approach to random vibration load estimation is based, particularly at the preliminary design stage, on the use of Miles' equation which assumes a single degree-of-freedom (DOF) system and white noise excitation. This paper examines the implications of the use of multi-DOF system models and response calculation based on numerical integration using the actual excitation spectra for random vibration load estimation. The analytical study presented considers a two-DOF system and brings out the effects of modal mass, damping and frequency ratios on the random vibration load factor. The results indicate that load estimates based on the Miles' equation can be significantly different from the more accurate estimates based on multi-DOF models.
Improved estimation of random vibration loads in launch vehicles
AIAA, AHS, and ASEE, Aerospace Design Conference ; 1993 ; Irvine, CA, United States
1993-02-01
Conference paper
No indication
English
BRIEFS - Software - Program Estimates Loads in Launch Vehicles
Online Contents | 1999
Vibration Analysis of Clustered Launch Vehicles
NTIS | 1965
|Vibration analysis of clustered launch vehicles
TIBKAT | 1965
|