Thrust Stand Micromass Balance for the Direct Measurement of Specific Impulse

Ketsdever, Andrew D.; D’Souza, Brian; Lee, Riki H.

doi:10.2514/1.36921

Cited by 27 publications

(13 citation statements)

References 7 publications

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“…Force was measured using a micro-Newton torsional balance similar to that in [9]. The balance incorporates top and bottom Cflex pivot bearings for motion control, and a Schaevitz HR-050 linear variable differential transformer for deflection measurement [10].…”

Section: Seen Inmentioning

confidence: 99%

Amplification and reversal of Knudsen force by thermoelectric heating

O’Neill¹,

Wada²,

Strongrich³

et al. 2014

AIP Conference Proceedings

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Abstract. We show that the Knudsen thermal force generated by a thermally-induced flow over a heated beam near a colder wall could be amplified significantly by thermoelectric heating. Bidirectional actuation is achieved by switching the polarity of the thermoelectric device bias voltage. The measurements of the resulting thermal forces at different rarefaction regimes, realized by changing geometry and gas pressure, are done using torsional microbalance. The repulsive or attractive forces between a thermoelectrically heated or cooled plate and a substrate are shown to be up to an order of magnitude larger than for previously studied configurations and heating methods due to favorable coupling of two thermal gradients. The amplification and reversal of the Knudsen force is confirmed by numerical solution of the Boltzmann-ESBGK kinetic model equation. Because of the favorable scaling with decreasing system size, the Knudsen force with thermoelectric heating offers a novel actuation and sensing mechanism for nano/microsystems.

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Section: Seen Inmentioning

confidence: 99%

Amplification and reversal of Knudsen force by thermoelectric heating

O’Neill¹,

Wada²,

Strongrich³

et al. 2014

AIP Conference Proceedings

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“…The expanding hot gases generated in the slow burning of propellant formulations produce the forces (thrust) necessary to propel a bullet from a gun or to accelerate rockets and spacecraft. Many experimental methods exist for the measurement and characterization of explosives (Suceska, 1995) and propellant performance Ketsdever et al (2008). However, in most instances, obtaining data from energetic materials testing is prohibited due to expensive equipments and difficulty in conducting some of these tests.…”

Section: Introductionmentioning

confidence: 99%

Simple Correlations for the Estimation of Propellants Specific Impulse and the Gurney Velocity of High Explosives

Frem¹

2015

Combustion Science and Technology

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Two simple correlations are proposed for the prediction of the specific impulse � � of propellants and the Gurney velocity (�2 ) of high explosives. It was found that the oxygen balance (OB) correlates well with experimental (�2 ) for 24 types of explosives and � � values for 22 monopropellants and propellants formulations obtained from ISPBKW thermochemical code. The results shows that most of the estimated values do not deviate more than 4% for (�2 ) and 3% for � � when compared to experimental and ISPBKW code output and that the new relationships are suitable for engineering calculations where experimental or complex predictive methods are not available.

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“…There are presently countless microthrusters being developed by universities, commercial interests and government organizations [3] [5]. Torsion pendulum thrust stands have commonly been used to accurately measure the performance these thrusters [1][5] [9].…”

Section: Introduction and Thrust Stand Overviewmentioning

confidence: 99%

Dynamic Modeling and Experimental Validation of Thrust-stand for Micropropulsion Testing

O’Neill¹,

Lee²,

Cofer³

et al. 2015

51st AIAA/SAE/ASEE Joint Propulsion Conference

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With the current expansion of microthruster research there is an accompanying need to accurately measure the performance of possible thrusters. A torsion pendulum thrust stand is a common method of measuring thrust in the microNewton range. Because of the oscillatory nature of the pendulum, the system is often in some dynamic state where measurement of thrust is difficult. The need for accurate measurements of unsteady performance in developing MEMS microthrusters led to the application of this dynamic method. Previous endeavors have focused only on steady state measurements. Proof of concept is achieved by applying electrostatic forces of known value and applything the dynamic thust extraction method. The main goals of this paper are to present the development and application of the thrust stand dynamic model and its application to unsteady force extraction. Nomenclaturea = Distance from point of force application to axis of rotation [m] b = Distance from point of dampening to axis of rotation [m] F = Force applied to thrust stand [N] I = Moment of inertia about axis of rotation [kg·m 2 ] k = Spring Coefficient [N·m/rad] M = Moment applied to thrust stand [N·m] θ = Angular displacement of thrust stand [rad] γ = Dampening coefficient of thrust stand [N·s/m]

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Thrust Stand Micromass Balance for the Direct Measurement of Specific Impulse

Cited by 27 publications

References 7 publications

Amplification and reversal of Knudsen force by thermoelectric heating

Amplification and reversal of Knudsen force by thermoelectric heating

Simple Correlations for the Estimation of Propellants Specific Impulse and the Gurney Velocity of High Explosives

Dynamic Modeling and Experimental Validation of Thrust-stand for Micropropulsion Testing

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