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Shock and Vibration
Volume 2015 (2015), Article ID 803253, 8 pages
http://dx.doi.org/10.1155/2015/803253
Research Article

Impulse Force Balance for Ultrashort Duration Hypersonic Test Facilities

1Department of Aerospace Engineering, Indian Institute of Technology Bombay, Powai, Mumbai 400-076, India
2Institute of Pulsed Power Science and Graduate School of Science and Technology, Kumamoto University, Kumamoto 860-8555, Japan

Received 15 September 2014; Accepted 30 April 2015

Academic Editor: Anindya Ghoshal

Copyright © 2015 P. Singh et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

This paper presents the measurement of side force, pitching, and yawing moments on a model, using an accelerometer force balance, in a short duration hypersonic shock tunnel. The test model is a blunt-nosed, flapped delta wing, mounted on a support sting through a force balance. The flexible rubber bushes constituting the balance allow the model to float freely on the sting during the test. The accelerometers were located in the model to record accelerations in the directions of interest. The model was tested in shock tunnel at Mach 8 at different angles of incidence with the freestream. Dynamic calibration of the test assembly was carried out for the acquisition of impulse response functions for the above components of force and moments, using an impulse hammer. The convolution technique was applied to derive the impulse response functions. The accelerometer outputs from the model in the hypersonic freestream were processed using the respective impulse response functions to derive the unknown aerodynamic force and moments. The newly adopted convolution technique has been found very effective for data reduction from accelerometer force balances developed for shock tunnel applications.