Motor Vehicle Side Sill Panel Composite Noise Reduction
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Solution Overview
Problem
Conventional side sills for motor vehicles are heavy and ineffective in reducing stone impact noises, necessitating additional acoustic measures.
Innovation Solution
A multi-part side sill panel composed of acoustically active nonwoven fabric and plastic, with overlapping extensions connected via welding or adhesive bonding, providing a lightweight and aesthetically appealing solution that reduces stone impact noises.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional sill panels are used, then the panel provides structural coverage, but the weight is excessive and stone impact noises are not reduced
Solution Approach 1:
The sill panel is constructed as a composite structure with a plastic substrate and a nonwoven fabric layer. The plastic provides structural integrity and coverage, while the nonwoven fabric layer specifically addresses stone impact noise reduction. This composite approach allows the panel to achieve noise reduction functionality without requiring additional acoustic measures, while maintaining structural coverage.
Solution Approach 2:
The nonwoven fabric layer in the composite panel structure provides acoustic absorption properties through its porous structure. This layer is specifically designed to reduce stone impact noises by absorbing and dampening the noise generated when stones strike the sill panel, while the overall composite structure maintains appropriate weight characteristics.
2Object-affected harmful factors
If additional acoustic measures are added to reduce noise, then noise reduction is improved, but device complexity and weight increase
Solution Approach 1:
The acoustic noise reduction function is merged directly into the sill panel structure itself through the integrated nonwoven fabric layer. This eliminates the need for separate acoustic measures or additional components, as the noise reduction functionality is combined with the structural panel in a single integrated assembly, thereby reducing device complexity.
Solution Approach 2:
The composite sill panel serves multiple functions simultaneously: it provides structural coverage as a sill panel and incorporates noise reduction capabilities through the nonwoven fabric layer. This multi-functional design means that a single component achieves both structural and acoustic purposes, eliminating the need for additional dedicated acoustic measures.
3Ease of manufacture
If the panel parts are connected at corners, then assembly is simple, but the connection is unstable and sensitive to bending
Solution Approach 1:
The connection between panel parts transitions from corner-to-corner connection to edge-to-edge overlapping connection. This dimensional change in the connection geometry provides a larger connection area and creates a more stable structural arrangement that is less sensitive to bending forces, while still maintaining assembly simplicity through the overlapping design.
Solution Approach 2:
The sill panel is divided into multiple parts with overlapping edges that connect through welding or adhesive bonding. This segmented design with overlapping connections allows each part to maintain its structural integrity while creating a stable combined structure that resists bending forces more effectively than corner connections alone.
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
The solution achieves a weight reduction and effective noise reduction without the need for additional acoustic measures, creating a stable and attractive outer surface.
Implementation Method 1
The sill panel (3, 4) is composed of plastic and reduces stone impact noises. The multi-part sill panel has a first, lower sill panel part (3) that faces a roadway. The lower sill panel is composed of an acoustically active nonwoven fabric.
Implementation Method 2
The connection of the extensions takes place, for example, via retrospective welding or adhesive bonding of the overlap.
Implementation Method 3
The connection of the extensions takes place, for example, via retrospective welding or adhesive bonding of the overlap.
Data Source
AI summary
The sill panel is of multi-part design and consists of a lower sill panel part facing the carriageway and composed of nonwoven fabric (LWRT) and of an upper adjoining sill panel part composed of plastic (PTT). The two sill panel parts are connected to each other by means of an edge-side overlap which is adhesively bonded or welded.