Lack of Effects on Goal-Directed Behavior of High-Intensity Infrasound in a Resonant Reverberant Chamber

Cook, Michael; Sherry, Clifford F.; Brown, Caroll G.; Jauchem, James R.

doi:10.21236/ada398702

Cited by 3 publications

(1 citation statement)

References 13 publications

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“…The U.S. Army Research Laboratory (ARL) has developed two generations of HILF (High-Intensity Low Frequency) devices [2,3,4] which can generated high-intensity infrasound over a frequency range from 2 to 20Hz. Cook MC [5] has designed and constructed a reverberant resonant chamber with reinforced concrete, which incorporated a moveable wall tunable to specific frequencies such as 10, 12, 15, and 20 Hz. The experimental results show that it is difficult to obtain high sound pressure levels in a large cavity.…”

Section: Introductionmentioning

confidence: 99%

Theoretical and Experimental Study of a Prototype High-Intensity Infrasonic Acoustic Generator

Dong

Chen

Xue-Zhong

et al. 2011

Journal of Low Frequency Noise, Vibration and Active Control

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The airflow modulator, which can generate the high-intensity infrasound, is a device transferring high-pressure gas energy into acoustic energy. Based on the aerodynamic theory, an airflow modulator is designed and the equivalent throat area formulas are deduced. Approximate theory is used to investigate the maximum sound pressure level, sound power, and airflow efficiency of this airflow modulator. The working mechanisms of the infrasonic acoustic generator consisting of a modulator and a Helmholtz resonator are studied by numerical simulations. In order to carry out the experiments, a prototype device was manufactured. It is shown that from the experimental results that this device can generate a continuous infrasound pressure level of 161dB in a 6 m 3 test cavity. The simulation and the experimental results are reasonably consistent and it is estimated that such a device can generate an infrasound pressure level in excess of 162dB below 3Hz.

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Section: Introductionmentioning

confidence: 99%

Theoretical and Experimental Study of a Prototype High-Intensity Infrasonic Acoustic Generator

Dong

Chen

Xue-Zhong

et al. 2011

Journal of Low Frequency Noise, Vibration and Active Control

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The Effects of Infrasound on Rhesus Monkey Performance of a Continuous Compensatory Tracking Task

Sherry

Cook

Jauchem³

et al. 2008

Journal of Low Frequency Noise, Vibration and Active Control

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Background: Potential bio-behavioral effects of infrasonic energy (<20 Hz) have generally been considered to be due to extra-aural (non-hearing) mechanisms. Since systems that deliver acoustic energy, including infrasound, are being considered for use as non-lethal weapons, it is important to elucidate the possible aural and extra-aural effects of such energy. Methods: Subjects (5 adult male rhesus monkeys) engaged in a continuous compensatory tracking task. The effect of short-term exposure to high-intensity infrasound (160 dB), using a custom-made system, on tracking task performance was measured. The effects of the infrasound exposure on auditory measures (otoacoustic emissions and auditory brainstem evoked potentials) were also examined. Results: Tracking behavior of the subjects was substantially disrupted by exposure to 10-Hz infrasound at 160 dB. There was no evidence of any post-exposure alterations in tympanometry, distortion product otoacoustic emissions, or in auditory brainstem evoked potentials. Conclusions: Although the present experiments showed significant effects on performance, further experiments using larger working volumes would have to be undertaken to address the potential uses of such a device.

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High-Intensity Acoustics for Military Nonlethal Applications: A Lack of Useful Systems

Jauchem¹,

Cook²

2007

Military Medicine

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There have been many previous claims of nonlethal acoustic weapon effects, mostly in the popular rather than the scientific literature. Anecdotal reports of extraordinary effects can make meaningful assessment and review of this area very difficult. Acoustics research has shown that the nonlethal weapon capabilities of audible sound generators have been grossly overstated. Although high-intensity infrasound significantly disrupted animal behavior in some experiments, the generation of such energy in a volume large enough to be of practical use is unlikely because of basic physical principles. On the basis of experimentation completed to date at a number of institutions, it seems unlikely that high-intensity acoustic energy in the audible, infrasonic, or low-frequency range can provide a device suitable for use as a nonlethal weapon.

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Lack of Effects on Goal-Directed Behavior of High-Intensity Infrasound in a Resonant Reverberant Chamber

Cited by 3 publications

References 13 publications

Theoretical and Experimental Study of a Prototype High-Intensity Infrasonic Acoustic Generator

Theoretical and Experimental Study of a Prototype High-Intensity Infrasonic Acoustic Generator

The Effects of Infrasound on Rhesus Monkey Performance of a Continuous Compensatory Tracking Task

High-Intensity Acoustics for Military Nonlethal Applications: A Lack of Useful Systems

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