Vehicle Pass-By Noise Reduction via Localized Acoustic Absorption
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Solution Overview
Problem
Current simulation methods for reducing vehicle Pass-By Noise (PBN) often compromise vehicle performance in terms of Rolling Resistance coefficient, behavior in wet conditions, and handling, and require excessive use of noise absorption materials, increasing weight and cost.
Innovation Solution
A simulation method combining Finite Element Methods (FEM) to model tires, vehicle body parts, and noise-absorbing materials, identifying critical noise paths and optimizing sound absorbing material positioning and properties, particularly at wheel-arch and underbody parts, using polyurethane (PU) and Ethylene-Propylene Diene Monomer (EPDM) materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If noise absorption material is applied to reduce PBN, then exterior noise absorption is improved, but vehicle weight increases
Solution Approach 1:
The patent applies noise absorption material selectively at critical locations (wheel-arch and underbody parts) rather than uniformly across the entire vehicle. The simulation method identifies specific noise paths and positions material only where it provides maximum noise reduction benefit, thereby achieving effective PBN reduction while minimizing total material weight and cost.
Solution Approach 2:
The patent optimizes material properties parameters (such as density, thickness, and acoustic absorption coefficients) through simulation to achieve maximum noise reduction with minimum material quantity. By varying these parameters in the virtual model, the system determines the optimal balance between noise absorption performance and weight addition.
2Object-affected harmful factors
If noise absorption material is applied to reduce PBN, then exterior noise absorption is improved, but vehicle cost increases
Solution Approach 1:
The patent applies noise absorption material selectively at critical locations (wheel-arch and underbody parts) rather than uniformly across the entire vehicle. The simulation method identifies specific noise paths and positions material only where it provides maximum noise reduction benefit, thereby achieving effective PBN reduction while minimizing total material weight and cost.
3Object-affected harmful factors
If tire design is modified to reduce PBN, then noise reduction is improved, but rolling resistance and vehicle handling deteriorate
Solution Approach 1:
The patent introduces noise absorption material as an intermediary element between the tire and the external environment. Instead of modifying the tire itself, the material acts as a mediator that captures and dampens vibrations generated by the tire, converting mechanical energy to thermal energy through viscous dissipation. This approach reduces noise without affecting tire performance characteristics.
Solution Approach 2:
The patent replaces mechanical tire design modifications with an acoustic/viscoelastic solution. Rather than changing the mechanical structure of the tire to reduce noise, the system uses noise absorption material that utilizes viscoelastic damping and acoustic energy dissipation mechanisms to reduce noise, thereby avoiding any compromise to tire performance.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach reduces PBN effectively while minimizing added weight and cost, maintaining vehicle performance, and allows for high exterior noise absorption without compromising rolling resistance, wet conditions, or handling.
Implementation Method 1
applying noise absorption material upon selected vehicle parts
Implementation Method 2
Suitable noise absorbing materials to be used in the invention are polyurethane (PU) and Ethylene-Propylene Diene Monomer (EPDM)
Data Source
AI summary
A simulation method of a vehicle Pass-By Noise (PBN), which method comprises the following steps: (i) providing a tyre model, a vehicle model and one or more sound absorbent material models as inputs to a calculation module; (ii) simulating, by means of the calculation model, a Pass-By noise (PBN) generation profile of one or more rolling tyres based upon the tyre model; (iii) identifying, by means of the calculation module, one or more noise paths at the vehicle body; and (iv) selecting a position and an absorbent material property of an absorbent material to be positioned at vehicle body in order to minimize Pass-By Noise.