GMW GMW14237 CRFM Flexural Mode Frequency Evaluation Procedure
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GMW GMW14237 Document Information:
Title
CRFM Flexural Mode Frequency Evaluation Procedure
GM Worldwide
Publication Date:
Sep 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 CRFM (Condenser Radiator Fan
Module) lowest flexural mode
natural frequency. The product of this procedure will be a frequency
value in Hz.
Forward.
The CRFM lowest flexural mode natural frequency is called out to
reduce cooling fan imbalance
forces transmitted to the vehicle. Keeping the flexural mode natural
frequencies adequately
separated from fan high speed operating frequencies (fan speed rpm/60)
prevents amplification of
forces.
Applicability.
This test procedure is appropriate for use with all passenger cars and
light trucks utilizing
cooling fans attached to the radiator condenser assembly. This
includes vehicles with a combination
of engine driven and electric fans.
Definitions.
Wholly contained in GMW14181.
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