Tire modelling for cavity noise prediction in a complete vehicle simulation environment: Evaluation of CDTire/NVH in NVH Director
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Typ
Examensarbete för masterexamen
Program
Applied mechanics (MPAME), MSc
Publicerad
2022
Författare
Carlsson, Maja
Idoffsson, Daniel
Modellbyggare
Tidskriftstitel
ISSN
Volymtitel
Utgivare
Sammanfattning
With an ongoing transition in industry to battery electric vehicles, interior noise will
no longer be dominated by an engine sound but shift to mainly originate from road
noise instead. Road noise is highly dependent on the tires however traditionally
used tire models have been insufficient in accurately predicting cavity noise which
is problematic due to it being highly noticeable for the customer. New tire models
have arised in recent years where CDTire/NVH is one of the most prominent ones.
This thesis aims to evaluate the predictive capability of CDTire/NVH in the software
package NVH Director (NVHD) but also conclude whether it can be advised
or not to implement it in the working procedures at Volvo Car Corporation (VCC).
The evaluation was performed by comparing the performance of CDTire/NVH with
the spindle load method as well as physical measurements. Primary focus of the
comparisons were made on the complete vehicle, focusing on cavity noise in terms
of predicted absolute values, trends and critical transfer paths. In addition to these
comparisons, an evaluation of a stand alone tire were also made in order to capture
the direct response.
Results show that CDTire/NVH in NVHD can capture the split of the cavity modes
for a stand-alone tire but with unexpected sensitivity to the load case configuration.
When implemented in the complete vehicle simulation model, there are ripples in
the frequency response of interface forces. Furthermore, the transfer path analysis
possibilities when using CDTire/NVH in NVHD is currently more restricted and
fewer than the ones available with the spindle load method. All simulation results
were obtained for one tire parameterization and simplified shaker excitation was
used for the stand-alone tire. Due to the challenges encountered when adding the
tires to the complete vehicle model in NVHD, it was neither possible to verify
the performance of CDTire/NVH in NVHD by comparison with the established
spindle load method nor possible to validate the tire model against full vehicle
measurements. All results obtained in this thesis were obtained with NVHD version
21.2. Consequently, it is currently not advised to VCC to implement evaluated
version of CDTire/NVH in NVHD into their working procedures. However, due to
the potential of using CDTire/NVH in NVHD, it is also recommended to evaluate
a revised version of the software addressing the issues identified in this thesis.
Beskrivning
Ämne/nyckelord
CDTire , NVH , Road noise , Tire model , Hyperworks , Volvo Car Corporation