I'd be skeptical though, based on things like [link|http://trauma.cofa.unsw.edu.au/Infrasound/NewScientist01.html|this] more recent article.
The idea that low-frequency vibrations make you ill may have started because some people feel queasy during earthquakes. Nikola Tesla, the inventor of transformers and generators, reportedly duplicated the effect with a vibrating chair almost a century ago.
But those observations were based on mechanical vibrations in solids, which couple energy to the human body much more efficiently than sound waves can transfer energy from the air. Altmann says that experiments in which people or animals have been subjected to airborne infrasound suggest the weapons won't work.
"I found no hard evidence for vomiting or uncontrolled defecation, even at levels of 170 decibels or more," Altmann says. And while air transmits infrasound very well, he points out that the wavelengths are so long--17 metres or more--that it spreads out too rapidly to form a controllable beam.
FWIW.
Cheers,
Scott.