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

Sahoo, Niranjan; Mahapatra, D. Roy; Jagadeesh, G.; Gopalakrishnan, S.; Reddy, K. P. J.

doi:10.1016/j.measurement.2006.03.016

Cited by 42 publications

(22 citation statements)

References 10 publications

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“…But these experiments, when conducted in impulse facilities (like shock tubes, shock tunnels, or expansion tubes), demand for sophisticated instruments due to very small test flow duration. Typically, two force balance techniques, namely, inertia based [1] and stiffness based [2], have been reported in literature for force measurement. Out of these two techniques, stiffness based balance represents the system more accurately.…”

Section: Introductionmentioning

confidence: 99%

Shock Tube as an Impulsive Application Device

Nanda

Agarwal

Kulkarni

et al. 2017

International Journal of Aerospace Engineering

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Current investigations solely focus on application of an impulse facility in diverse area of high-speed aerodynamics and structural mechanics. Shock tube, the fundamental impulse facility, is specially designed and calibrated for present objectives. Force measurement experiments are performed on a hemispherical test model integrated with the stress wave force balance. Similar test model is considered for heat transfer measurements using coaxial thermocouple. Force and heat transfer experiments demonstrated that the strain gauge and thermocouple have lag time of 11.5 and 9 microseconds, respectively. Response time of these sensors in measuring the peak load is also measured successfully using shock tube facility. As an outcome, these sensors are found to be suitable for impulse testing. Lastly, the response of aluminum plates subjected to impulsive loading is analyzed by measuring the in-plane strain produced during deformation. Thus, possibility of forming tests in shock is also confirmed.

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Section: Introductionmentioning

confidence: 99%

Shock Tube as an Impulsive Application Device

Nanda

Agarwal

Kulkarni

et al. 2017

International Journal of Aerospace Engineering

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“…1 This inertia dominated force measurement technique has been then extended for numerous applications. [2][3][4] Sanderson and Simmons developed a stress wave force balance method, based on the local strain time history, for measurement of suddenly applied aerodynamic load in the high speed test facility. 5 This sti®ness dominated force measurement concept has been then considered for various applications.…”

Section: Introductionmentioning

confidence: 99%

Experimental Assessment of Noncontact Type Laser-Based Force Measurement Technique for Impulsive Loading

Pallekonda

Bommana

Kulkarni

et al. 2014

Int. J. Str. Stab. Dyn.

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Force measurement is an essential element in the design of mechanical or nonmechanical systems. The choice of a particular technique, among the numerous measurement techniques available, depends on various parameters within which the nature of force is an important one. The measurement of impulse force is considered in this study using two techniques. In view of this, an experimental setup has been developed to understand the applicability and assessment of a laser-based extrusive technique, along with the established intrusive accelerometer-based technique for impulsive force measurement. The accelerometer-based measurements can be used to precisely predict the magnitude and temporal nature of the force. However, the velocitybased impulse prediction shows some limitation on complete representation of the system. In addition, the indirect measurement of acceleration from the velocity measured seems to have better prediction of the force.

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“…A force measurement method which requires identification of the system's dynamic parameters has been wellestablished in thrust and drag measurements in shock tunnels [10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26] and appears feasible for application to PDEs. In fact, as an intermediate step, these force measurement techniques can be directly applied to a single-shot…”

Section: Introductionmentioning

confidence: 99%

Unsteady Thrust Measurement for Pulse Detonation Engine

Joshi¹,

Lu²

2014

50th AIAA/ASME/SAE/ASEE Joint Propulsion Conference

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A new approach to thrust measurement for pulse detonation engines (PDEs) was developed to account for the effects of system dynamics. The approach was applied to a PDE operating at 10 and 20 Hz. Important system parameters such as steady-state response, effective mass of PDE and thrust measurement rig structure, and mass flow rates of fuel/oxidizer were first determined. The system dynamics of the PDE, deconvolved in the frequency domain, was studied. The system's transfer function between the thrust and a corresponding pressure obtained by a single propagating detonation pressure history during a typical PDE operation was established and used to reconstruct the thrust response for pulsed operation. A proper reconstruction of the deconvolved thrust values was accomplished through this technique. The acceleration experienced by the PDE thrust measurement rig during a typical operation was also measured. This measured acceleration when multiplied by the determined effective mass gave an estimate of the inertial force. The estimated inertial force when subtracted from the deconvolved force gave actual thrust. The measured and compensated thrust were expressed in the form of impulse.

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

Cited by 42 publications

References 10 publications

Shock Tube as an Impulsive Application Device

Shock Tube as an Impulsive Application Device

Experimental Assessment of Noncontact Type Laser-Based Force Measurement Technique for Impulsive Loading

Unsteady Thrust Measurement for Pulse Detonation Engine

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