GMW GMW14207 Steering Wheel - Flexural Modes Evaluation Procedure
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GMW GMW14207 Document Information:
Title
Steering Wheel - Flexural Modes 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 flexural mode of a
steering wheel/airbag assembly
mounted to-ground at the steering wheel hub. The product of this
procedure will be a lowest
flexural frequency value in Hz.
Forward.
If a steering wheel/airbag as mounted in-vehicle has a first resonant
frequency at or near engine
firing frequency at idle (25-65 Hz, depending on vehicle), or other
vibration source frequencies
(e.g. engine cooling fan, HVAC blower fan), it could amplify energy
from the powertrain to the
driver. The steering wheel Subsystem Technical Specification (SSTS)
contains a requirement for
steering wheel/airbag assembly as mounted to-ground lowest flexural
frequency. This provides an
assessment of performance prior to vehicle hardware or full system
model.
Applicability.
This test procedure is appropriate for use with steering wheel/airbag
assemblies from passenger
cars and light trucks.
Definitions.
Not applicable.
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