Mary Fran Desrochers, Gary W. Olsen, and M. K. Hudson
ABSTRACT: A strain gauge thrust measurement system is described for rocket motor ground testing. The unit uses sigmoid beams to hold the rocket motor in place, with the strain gauges mounted on these beams. The theory and usage of strain gauges is briefly discussed, along with all circuit and other information necessary to build a similar system. The system was calibrated for the 50 lb thrust level and applied to the UALR Hybrid Rocket Facility. Its performance characteristics are discussed. The system was found suitable for continuous monitoring in such a ground testing environment, and indicated that the hybrid thruster utilized in the facility develops 41 lbf thrust at an oxidant mass flow of 0.125 lbm.
Keywords: rocket ground testing, thrust sensor, combustion diagnostics, strain gauge, hybrid rocket
Ref: JPyro, Issue 14, 2001, pp50-55
(J14_50)
© Journal of Pyrotechnics and CarnDu Ltd
