Rolling Tire Exterior Noise Simulation via Structural-Acoustic Mapping
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current Finite Element Method (FEM) simulations are limited to non-rolling tires and lack an effective approach for simulating the exterior noise of rolling tires with detailed tread patterns, leading to inaccurate results and high computational times due to the axial-symmetric limitations and complex tire geometry.
Innovation Solution
A method that performs explicit FEM simulation of a rolling tire with all pattern features, followed by a mapping process to convert the structural simulation results into a non-rolling acoustic mesh for efficient acoustic simulation, using a customized algorithm to transfer vibration data from the Lagrangian to the Eulerian domain, allowing for accurate simulation of exterior noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If FEM simulation is performed on a rolling tire with detailed tread pattern, then simulation accuracy is improved, but computational time increases significantly
Solution Approach 1:
The simulation process is divided into two separate stages: (1) structural simulation to obtain vibration data from the rolling tire, and (2) acoustic simulation to calculate exterior noise. This segmentation allows each stage to use optimized methods appropriate for its specific purpose, reducing overall computational time while maintaining accuracy.
Solution Approach 2:
A virtual tire surface is created by mapping vibration data from the structural simulation onto a stationary acoustic mesh. This copying approach allows the acoustic simulation to use a simplified, non-rolling mesh while still capturing the vibration characteristics of the detailed tread pattern, significantly reducing computational complexity.
2Reliability
If a detailed tread pattern model is used in FEM simulation, then simulation realism is improved, but device complexity increases
Solution Approach 1:
The complex tread pattern is handled only in the structural simulation stage, where the full geometric detail is needed to capture realistic vibrations. The acoustic simulation stage uses a simplified surface model, separating the complexity management across different simulation phases.
Solution Approach 2:
Instead of using the full complex tread pattern geometry in the acoustic simulation, the vibration characteristics are copied onto a simplified virtual tire surface. This maintains simulation realism through accurate vibration data while reducing geometric complexity for the acoustic analysis.
3Productivity
If axial-symmetric tire model is used, then computational efficiency is improved, but simulation accuracy deteriorates due to inability to model lateral slots
Solution Approach 1:
The method explicitly handles asymmetric tire geometries by using a full 3D tread pattern model in the structural simulation. The virtual tire surface then captures these asymmetric vibration characteristics, allowing lateral slots and other non-axisymmetric features to be accurately represented without requiring axial-symmetric simplifications.
Data Source
AI summary
A simulation method of exterior noise generated by a rolling tyre, in particular Pass-By Noise (PBN), which method comprises the following steps: (iv) providing a FEM structural model of a rolling tyre including modelled pattern features, wherein an instant position of each node is calculated; (v) providing the tyre structural model as input to a mapping procedure which outputs a tyre acoustic model, which procedure comprises the following sub-steps: (iia) for each target node of the acoustic mesh, a number of closest input nodes of the input structural mesh are selected; (iib) a value of a vibration variable for the target node is calculated starting from the values of such variable of the closest input nodes; (iic) for each target note a FFT (Fast Fourier Transform) is calculated to obtain the vibration variables in frequency domain; (vi) calculating the sound pressure field generated by the tyre based upon the tyre acoustic model.