Performance Evaluation of Accelerometers to 200,000 G

Togami, Takuya; Brown, F.A.; Forrestal, M. J.; Baker, William E.

doi:10.1115/1.2789036

Cited by 6 publications

(2 citation statements)

References 2 publications

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“…8,9 In the next section, we report on a stress wave analysis of the interaction of the aluminum incident bar and the tungsten disk, which provides a rigorous criterion for dynamic equilibrium of the disk. The disk must be in nearly dynamic equilibrium to be closely approximated as a rigid body and for our performance evaluation techniques to be accurate.…”

Section: Mj Forrestai (Sem Membermentioning

confidence: 99%

Performance evaluation of accelerometers used for penetration experiments

Forrestal

Togami

Baker

et al. 2003

Experimental Mechanics

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ABSTRACT--We present a Hopkinson bar technique to evaluate the performance of accelerometers that measure large amplitude pulses, such as those experienced during projectile penetration tests. An aluminum striker bar impacts a thin Plexiglas or copper disk placed on the impact surface of an aluminum incident bar. The Plexiglas or copper disk pulse shaper produces a nondispersive stress wave that propagates in the aluminum incident bar and eventually interacts with a tungsten disk at the end of the bar. A quartz stress gage is placed between the aluminum bar and tungsten disk, and an accelerometer is mounted to the free end of the tungsten disk. An analytical model shows that the rise time of the incident stress pulse in the aluminum bar is long enough and the tungsten disk length is short enough that the response of the tungsten disk can be accurately approximated as rigid-body motion. We measure stress at the aluminum bar-tungsten disk interface with the quartz gage and we calculate rigid-body acceleration of the tungsten disk from Newton's Second Law and the stress gage data. In addition, we measure strain-time at two locations on the aluminum incident bar to show that the incident strain pulse is nondispersive and we calculate rigid-body acceleration of the tungsten disk from a model that uses this strain-time data. Thus, we can compare accelerations measured with the accelerometer and accelerations calculated with models that use stress gage and strain gage measurements. We show that all three acceleration-time pulses are in very close agreement for acceleration amplitudes to about 20,000 G.

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Section: Mj Forrestai (Sem Membermentioning

confidence: 99%

Performance evaluation of accelerometers used for penetration experiments

Forrestal

Togami

Baker

et al. 2003

Experimental Mechanics

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“…The impact sensitivity and uncertainty of the calibrated accelerometer are obtained through the quasi-static calibration test to guarantee accuracy of the high-impact test data. This is of great significance to both theoretical research on weapon design, and analyses on weapon performance [ 1 , 2 , 3 , 4 , 5 ].…”

Section: Introductionmentioning

confidence: 99%

Quasi-Static Calibration Method of a High-g Accelerometer

Wang

Fan

Jing

et al. 2017

Sensors

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Abstract:To solve the problem of resonance during quasi-static calibration of high-g accelerometers, we deduce the relationship between the minimum excitation pulse width and the resonant frequency of the calibrated accelerometer according to the second-order mathematical model of the accelerometer, and improve the quasi-static calibration theory. We establish a quasi-static calibration testing system, which uses a gas gun to generate high-g acceleration signals, and apply a laser interferometer to reproduce the impact acceleration. These signals are used to drive the calibrated accelerometer. By comparing the excitation acceleration signal and the output responses of the calibrated accelerometer to the excitation signals, the impact sensitivity of the calibrated accelerometer is obtained. As indicated by the calibration test results, this calibration system produces excitation acceleration signals with a pulse width of less than 1000 µs, and realize the quasi-static calibration of high-g accelerometers with a resonant frequency above 20 kHz when the calibration error was 3%.

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Performance evaluation of high g accelerometers

Cheng²,

Sun³

2013

J Mech Sci Technol

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Performance Evaluation of Accelerometers to 200,000 G

Cited by 6 publications

References 2 publications

Performance evaluation of accelerometers used for penetration experiments

Performance evaluation of accelerometers used for penetration experiments

Quasi-Static Calibration Method of a High-g Accelerometer

Performance evaluation of high g accelerometers

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