Accession Number : ADA267653

Title :   Ultrasonic Wave Propagation Model for Nondestructive Evaluation of Solid Rocker Motor Propellant.

Descriptive Note : Doctoral thesis,

Corporate Author : AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH

Personal Author(s) : Nici, Rosario

Report Date : 1993

Pagination or Media Count : 270

Abstract : The detection of voids in SRM propellant is critical to the safety of Launch Vehicles. Currently this is done with the use of x-rays as an NDE technique. It is hoped to supplant this technique with the use of ultrasonic NDE methods for reasons of reduced cost, increased mobility of the NDE set-up, automated accept/reject criteria, to name a few. To be feasible the ultrasonic NDE methods must be to differentiate between a through-transmission signal from an SRM propellant segment with a void, and a signal from a segment without a void. The ability of ultrasonic NDE to penetrate one meter of propellant has already been demonstrated with sufficient signal-to-noise ratio. The crux of the ultrasonic NDE method will be in using the information present in the received signal to detect, locate, and size voids.

Descriptors :   *SOLID PROPELLANT ROCKET ENGINES, *ULTRASONICS, *WAVE PROPAGATION, *NONDESTRUCTIVE TESTING, *VOIDS, THESES, MODELS, TEST AND EVALUATION, LAUNCH VEHICLES, SAFETY, X RAYS, SIGNAL TO NOISE RATIO, DETECTION, VISCOELASTICITY, TRACKING, ATTENUATION, VELOCITY, MATERIALS, TRANSDUCERS, FREQUENCY, NUMERICAL ANALYSIS, SIMULATION, STRESS STRAIN RELATIONS.

Subject Categories : Solid Propellant Rocket Engines
      Acoustics
      Optics
      Radiofrequency Wave Propagation

Distribution Statement : APPROVED FOR PUBLIC RELEASE