# Design and analysis of a ﬂat accelerometer-based force balance system for shock tunnel testing

Sahoo, Niranjan and Mahapatra, DR and Jagadeesh, G and Gopalakrishnan, S and Reddy, KPJ (2007) Design and analysis of a ﬂat accelerometer-based force balance system for shock tunnel testing. In: Measurement, 40 (1). pp. 93-106.

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## Abstract

This paper describes the design and development of a accelerometer-based thin ﬂat balance system for measuring aerodynamic forces on typical ﬂight configurations in impulse facilities. The balance system is used to measure the axial force on a blunt-nosed triangular plate ﬂying at Mach 5.75 in IISc hypersonic shock tunnel HST2 with a test ﬂow duration of $800\hspace{2mm}\mu s$. The model and the balance system are supported by rubber bushes, which leads to minimally restrained free ﬂoating conditions of the model in the test section during the ﬂow duration. Exhaustive 3D finite element simulations are carried out to select appropriate rubber material. The measured and simulated values of axial force match very well with the theoretical values predicted using Newtonian theory at moderate specific enthalpy levels of the test gas. In addition, the importance of implementing the 3D-FEM analyses in design study of the accelerometer balance system has been highlighted by comparing the results of axi-symmetric modeling with 3D modeling.

Item Type: Journal Article Copyright of this article belongs to Elsevier. Axial force;Accelerometer balance;Hypersonic speeds;FEM;Shock tunnel Division of Mechanical Sciences > Aerospace Engineering (Formerly, Aeronautical Engineering) 08 Aug 2007 19 Sep 2010 04:38 http://eprints.iisc.ernet.in/id/eprint/11421