Launch Vehicle and Spacecraft Acoustic Testing and Analysis

Each attendee will receive a CD copy of the PowerPoint presentation and a printed set of course materials.  Included in the PowerPoint presentation are hyperlinks to reference material which the student can use to research specialized areas of interest, if desired.

This course is designed for engineers, test personnel and managers who want to improve their understanding of state-of-the-art vibroacoustic phenomena, testing techniques, acoustic test facility design and prediction methods.

How to plan a test program to fully qualify a flight spacecraft for acoustic loads.  Key spacecraft acoustic testing rules-of-thumb and sanity checks.  Acoustic sound pressure theory for reverberant and non-reverberant (direct) acoustic testing.  Differences between launch and ground test acoustics.  Acoustic test facility design considerations.  The use of acoustic test data to support analytical model validation and spacecraft component random vibration test spectra.

1. Introduction to Launch Vehicle and Spacecraft Acoustic Testing and Analysis
   Outline.  Overall flow of processes and activities.  Launch and flight acoustics considerations.
2. Acoustic Sound Pressure Theory and Terminology
   Sound pressure measurement, propagation, reflection and absorbsion.  Properties of sound waves.
3. Launch and Flight Acoustics
   Sources of sound pressure.  Acoustic events during launch and ascent. Measurement of basic lift-off and ascent acoustic environments.  Estimation of acoustic test spectra based on measured launch data.  Estimation of acoustic test spectra based on ground testing.
4. Types of Spacecraft Acoustic Testing
   Technical, schedule and cost aspects of non-reverberant (direct) and reverberant acoustic testing.
5. Acoustic Test Technical Parameters
   Sound pressure level, frequency bandwidth, damping, coupling loss factors and reverberation time.
6. Acoustic Test Facility Design, Capabilities and Challenges
   Acoustic test facility schematics.  Acoustic chamber design considerations.  Sound pressure generation including vaporizers, transducers, horns and loud speakers.  Modal density. Instrumentation for acoustic testing.  Safety considerations.  Communications.
7. System Level Spacecraft Acoustic Test
   Acoustic testing philosophies, methods and requirements.  Acoustic test control. Data processing during acoustic testing.  Acoustic test management, personnel and requirements.  Sources of errors in spacecraft acoustic testing and error Mitigation.  Acoustic test plans, specifications, procedures and reports.
8. Avoiding Acoustics-Caused Problems
   How spacecraft modes respond to acoustic environments. Avoiding problems caused by vibro-acoustic responses during ground testing.  Payload fill effects. Differences between launch/flight and test acoustics.  Acoustic problems generated during spacecraft launch and ascent.
9. Analytical Prediction of Acoustics and Vibro-Acoustic Response
   General overview of statistical energy analysis and finite element and boundary element methods.  Estimation of spacecraft component random vibration using empirical methods.  Use of test data to support analytical modeling.