Study of Structural Damping in Solid Propellant Rocket Motors Undergoing Unstable Acoustic Oscillations.
Abstract
The objective of the program was to establish the role of structural damping regulating acoustic pressure growth rates in solid-propellant rocket motors and to show the accuracy to which structural damping calculations can be made. The planned approach called for testing to be conducted on subscale rocket motors to provide data for verification of analysis results. Because of various technical problems experienced in the testing task, the program objectives were not achieved. For example, a test configuration that yields accurate acoustic natural frequencies and mode shapes was found to be entirely inadequate for damping measurements. This problem, which was ultimately found to be the major problem with the experimental task, was traced to an unwanted acoustic coupling between the driver cavity and the main acoustic cavity in the test model. In spite of the problems, the coverage of the testing task given in this report should be of interest to anyone planning to measure structural dampening of acoustic modes in rocket motors.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1977
- Accession Number
- ADA054152
Entities
People
- F. R. Jesen