Filip De Coninck

Analysis of tire/road noise caused by road impact excitations

This paper presents the experimental analysis of tire/road noise and tire vibrations during road impact excitations. The tests are performed on a setup which is based on a tire on tire principle. Radiated noise, vibrations of the tire surface and spindle forces are measured during impact excitations. The influence of driving speed, cleat dimension, inflation pressure, tire temperature and preload are analyzed. Two novel tire measurement techniques are presented for the validation and/or parameterization of tire models. Those techniques include the use of a 6 degree of freedom high frequency CUBE shaker table for the characterization of rotating and non-rotating tires up to 250 Hz.

Direct and Indirect Vibro-Acoustic Measurements for Road Noise NVH Predictions

This paper describes vibro-acoustic direct and indirect measurements for road noise NVH predictions from a complete car. Attention is devoted to the dynamic response of the structure and interior pressure field toward tire patch displacement inputs. The direct measurements exploited the Team Corporation CUBE™ high frequency 6 degree-of-freedom (DOF) shaker recently installed at the KULeuven Vehicle Technologies Laboratory; the input was provided directly at the tire contact patch, while the responses were measured as accelerations and pressures on the structure. In the indirect measurements a low-mid frequency volume velocity source (LMFVVS) was used to acoustically excite the structure in the reverse path direction from the inside of the interior car cavity, while accelerations on the car and forces/torques where acquired by a 6-DOF dynamometer at the tire patch. From both types of excitations Frequency Response Functions (FRF) were calculated in the frequency range [0–500 Hz]. The non-linearity of the full car system was investigated with different direct and indirect measurement tests, in order to assess the feasibility of the reciprocity principle in such a complex structure. Measurement set-ups, results and comparisons are described and discussed in detail.© 2005 ASME