A SIMPLE ANALYSIS OF REENTRY VEHICLE ROLL RESONANCE
Abstract
Reentry vehicle roll resonance due to small mass and aerodynamic asymmetries is described analytically by a quasi-steady solution of the three- degree-of-freedom moment equations of motion. The quasi-steady analysis neglects oscillations in the vehicle orientation and angular rates about average (quasi- steady) values of these parameters, which change slowly with time relative to the oscillations. The study treats different regimes of reentry vehicle roll resonance that have been identified through computer solutions of the general equations of motion. These include high altitude roll lockin and breakout due to a single mass asymmetry, intermediate and low altitude subresonance with a single asymmetry, and spinup and lockin to low altitude resonance from a compound asymmetry. For each of the resonance regimes, analytical expressions are obtained that describe the quasi-steady vehicle motion, and the results are found to be in good agreement with computer solutions of the equations of motion. The analytical approximations provide a simple tool for predicting reentry vehicle dynamic behavior without requiring costly and time consuming machine computations.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1967
- Accession Number
- AD0810587
Entities
People
- Daniel H. Platus
Organizations
- The Aerospace Corporation