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GMW GMW14204 Document Information:
Title
CRFM Mounting Modal 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 CRFM (Condenser Radiator Fan
Module) mounting natural
frequency on vehicle or test buck. The product of this procedure will
be a frequency value in Hz.
Forward.
The CRFM mounting frequency is called out to reduce cooling fan
imbalance forces transmitted to the
vehicle in conjunction with minimizing the CRFM contribution to
vehicle rough road shake.
Placing the mounting frequency adequately below the fan high speed
operating frequency (fan speed
rpm/60) provides isolation of the forces. If the mounting frequency is
at or near fan operating
frequencies, amplification of the imbalance forces will occur.
Optimizing the mounting frequency for fan force isolation can degrade
rough road shake. Increasing
the mounting frequency generally reduces road shake interaction.
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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