Paper Title
Impulse Force Balance Technique to Measure Drag and Lift on Hypersonic Blunt Hemispherical Shaped Body

Abstract
Aerodynamic force measurement is identified as one of the critical challenge in the hypersonic regime. Short test duration hypersonic facilities require sophisticated methods to measure forces on the aerodynamic body. In this paper, impulse force balance technique is used to measure drag and lift forces on a blunt hemispherical shaped body placed at 0^0 and 〖15〗^0 respectively, at Mach 8 in shock tunnel. Development of this technique involved calibration of the model by giving a range of impulsive input forces using impact hammer. Output of these corresponding input forces is captured using accelerometers. Further, by use of convolution technique, impulse response function of the system is developed. This function is used to derive unknown aerodynamic force signals by operating it onto the output signals, which is acquired through accelerometers placed on the model when experimented in shock tunnel. Forces derived through convolution theory are validated by comparing with the Newtonian and balance theory. Keywords - Aerodynamic Force, Convolution Theory, Hypersonic Flow, Impulse Response.