| |
| Aviation
Helmet Upgrade Testing Shows Significant Impact Reduction |
Drop
tower testing revealed transmitted impact loads were reduced
25-35% in this fixed wing fighter helmet equipped with
the
Oregon Aero® ZetaLiner® helmet liner and SoftSeal/HushKit® Combo ear seals and insulation kit, compared to
the original helmet. Tests were conducted at Wright Patterson
Air Force Base, Dayton, Ohio.
In this standard
ANSI 290.21 helmet test, a 5 kg. head form is placed in the
helmet and both are raised approximately 40" in the air,
then dropped to produce an impact velocity of 10 ft./second.
|
OREGON
AERO® PASSIVE NOISE ATTENUATION COMPONENTS
PERFORM BETTER THAN ANR HEADSETS
Company Uses Data To Continue
Cranial Helmet Development |
Click
on charts below to enlarge.
What
do the charts say?
ANR Headsets/Oregon
Aero® SoftSeal/HushKit® Ear Seals *
Test conducted at US Government laboratory
 |
| For
this test, lower numbers are good! |
Oregon
Aero® Headset Upgrade Components/Best Performing
ANR Headset *
Test
conducted at US Government laboratory
 |
| For
this test, lower numbers are good! |
Oregon
Aero® Headset Upgrade Components/Best Performing
ANR Headset *
Test
conducted at US Government laboratory
 |
| For
this test, higher numbers are good! |
* When
comparing the test results, note that the reduction of sound
pressure is calculated in a non-linear logarithmic scale.
A 3dB reduction in overall sound pressure is equal to doubling
the distance to the noise source. E.g., 20' from the noise
source, less 3dB, would be equivalent to the sound level
at 40' from the noise source. An additional 3dB reduction
would create the sound pressure at 80' from the noise source;
3dB more would equal 160' from the noise source, etc.
WHAT
DO THE CHARTS SAY?
Here’s
what the charts say in a nutshell:
In the mid-range frequency levels
of 700-7000 Hz, the Oregon Aero® upgraded headset
performs significantly better than the best-performing ANR headset
and in fact the Oregon Aero numbers reach — and significantly
and consistently dip below — the desired 85dB level. This
is the sound frequency range that contributes the most to hearing
damage and loss.
"We go into the test lab without any
assumptions or expectations," says Mike Dennis. "In
this case, we knew our passive noise attenuation components were
very
effective in the speech band Hertz range and we wanted to see
the hard data."
"But beyond looking for numbers themselves, we always
look for the underlying stories the numbers are telling," he adds. "That’s
where we find the clues for the next stages of product development."
Oregon Aero is using such test data such to advance its development
of an innovative cranial helmet.
|
