GMW GMW14206 Seat-to-Ground Natural Frequency Evaluation Procedure
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GMW GMW14206 Document Information:
Title
Seat-to-Ground Natural Frequency Evaluation Procedure
GM Worldwide
Publication Date:
Jul 1, 2005
Scope:
The Impact FRF Master Test Procedure, GMW14181, shall be referenced
for more detailed information
corresponding to the following procedure.
Note: Nothing in the specification supersedes applicable laws and
regulations unless specific
exemption has been obtained.
Note: In the event of conflict between the English and domestic
language, the English language
shall take precedence.
Purpose.
Define the process of determining the first fore/aft and lateral
natural frequencies of a seat
mounted to ground. The product of this procedure will be a fore/aft
and a lateral frequency value
in Hz.
Forward.
If a seat as mounted in- vehicle has a first resonant frequency at or
near suspension frequencies
(8-16 Hz, depending on vehicle), it could amplify energy from the road
to the driver. The seat
Subsystem Technical Specification (SSTS) contains a requirement for
seat as mounted to-ground
natural frequencies (fore/aft and lateral). Typically, the frequency
of these modes will drop 1-3
Hz from the to-ground condition to in-vehicle, depending on the
rigidity of the floor structure.
Applicability.
This test procedure is appropriate for use with all seats from
passenger cars and light trucks.
Definitions.
All Belts to Seat (ABTS): a seat with an integral seat belt.
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