Operational Spindle Load Estimation Methodology for Road NVH Applications

On-resonance transmissibility methodology for quantifying the structure-borne road noise of an automotive suspension assembly

“…1) in order to provide realistic road noise excitations of the wheel. A vertical excitation (Z) was chosen because state of the art has indicated that this driving point orientation at the center of the wheel spindle represents, in most cases, a real road excitation of the wheel [3]. A stationary tire (no rolling) was preferred in order to minimize broadband noise produced by the rolling movement of bearings and by the impact generated by the imperfections in attachment points of the wheel (bushing, ball-joint, etc.).…”

“…The road noise can be characterized as a broadband noise source because it arises from the excitation of the tire/patch contact on a random road profile. The broadband vibrations, generated by road irregularities, are then transmitted by solid mechanical transmission paths up to the passenger compartment [3].…”

“…4Force/force frequency response function, Xaxis direction Force transducers located at the suspension lower Aarm linkage No 3. …”

Research on simulation and optimization of vehicle road noise based on random method

“…The load acquisition for vehicle road noise simulation adopts the method of combination of test and simulation. Through the test, the acceleration signals of four points that are no coplanar on each steering knuckle are measured, and the vibration transfer function from the wheel core to the test points are analyzed by the simulation method, and then, the loads in six directions at each wheel core are obtained by the inverse matrix method [1,2]. The most important part of the case control is the RANDOM card.…”

Research on Vehicle Road Noise Simulation Based on Virtual Proving Ground Technique

“…Road noise is the direct or radiated noise produced by the contact between tires and the road as the excitation source when the vehicle is driving. It is one of the important research topics in NVH field [3].The analysis of road noise is currently mainly based on the spindle load technique, in which acceleration response of knuckle recorded in the real vehicle road test and the transfer function from wheel center to knuckle obtained by FEM simulation are extracted to calculate the wheel center force as the stimulation input [4][5][6]. However, there are some defects in spindle load method.…”