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jguan12
08-30-2002, 01:23 AM
I am very grateful for the responses I received concerning my question on
the minimum sampling rate of head acceleration in the HIC calculation. A
summary of responses was as follows:

Rich Kent wrote:
Yes, there is. I can't remember off the top of my head, but I think
this information is contained in SAE recommended practice J211. You may
already know this, but the NHTSA has written software to calculate many
of the standard injury criteria, including HIC. You can download it
from the Office of Crashworthiness Research section of their website
www.nhtsa.dot.gov.


Richard Kent
Asst. Professor
Center for Applied Biomechanics
Dept. of Mechanical and Aerospace Engineering
University of Virginia
1011 Linden Ave
Charlottesville, VA

Erik G. Takhounts wrote:
To stay consistent SAE recommends a filter class 1000 (about 1600 Hz) for
acce
lerations. NHTSA usually requires a DAS sampling rate of at least 10000 Hz
fo
r accelerometer channels.
Hope this helps,
Erik


Erik G. Takhounts, Ph.D.
National Transportation Biomechanics Research Center
NHTSA, US Department of Transportation
400 Seventh Street, S.W., NRD-51, Room 6221
Washington, D.C. 20590



Dinos Visvikis wrote:

Guidelines for the conditioning, acquisition and processing of data can be
be found in:

ISO 6487 Road Vehicles - Measurement Techniques in Impact Tests -
Instrumentation (paragraph B.3.2.1)

SAE J211 - Instrumentation for Impact Tests (paragraph 9.2)

Both these standards are widely used in the automotive industry.

It is difficult to give a figure to you, because the minimum sampling rate
is dependent on the reconstruction method used in the processing software.
However, if you have Class 1000 presample filters, that corresponds to a
minimum sampling rate of 10 000 Hz.

Regards

Dinos Visvikis

Researcher
Biomechanics and Injury Prevention
TRL Limited

Ciaran Simms wrote:
Hello, the SAE specifies a low pass filter rate of 100 Hz I think, but you
may need to check that. As far as I can recall, the standards are set out in
SAE J11.

Xuejun Liu wrote:
Technically, the sampling rate should be at least 3000 Hz, because the head
linear acceleration is filtered by CFC1000 class afterwards. Usually 10-1000
kHz is recommended.

Robert Anderson wrote:
What is your antialiasing filter frequency? Multiply it by 5 and sample
at that speed.

Also refer to SAE Standard J211 which specifies instrumentation
specification requirements in crash testing.

(We anti-alias at 10 kHz, so sample at 50 kHz/channel)


Jinhua Guan

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