Rail Vehicle Wheel Sound Absorber with Offset Slotted Plates
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Solution Overview
Problem
Existing sound absorber elements for rail vehicle wheels face a challenge in balancing optimal sound absorption with mechanical durability, as they often compromise on one aspect for the other.
Innovation Solution
The design features a flat layered body with parallel absorber plates having slots that are offset in the plane, ensuring each slot is partially covered by a slot-free area of the adjacent plate, enhancing mechanical stability while allowing for optimized sound-damping properties through various slot arrangements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If slots are introduced in absorber plates to optimize sound absorption, then sound damping properties are improved, but mechanical durability and stability of the slot area deteriorate
Solution Approach 1:
The absorber plates are segmented into slotted regions and slot-free regions, creating a heterogeneous structure where slots provide sound absorption while solid regions provide mechanical strength. This segmentation allows simultaneous optimization of acoustic performance and structural integrity.
Solution Approach 2:
Different regions of the absorber plate have different properties: slotted regions optimize sound absorption while slot-free regions maintain mechanical stability. This local differentiation resolves the contradiction by assigning different functions to different parts of the same component.
2Reliability
If absorber plates are made solid to improve mechanical durability, then mechanical stability is improved, but sound absorption performance deteriorates
Solution Approach 1:
The plate is divided into solid and slotted sections, allowing the solid portions to provide mechanical stability while the slotted portions provide sound absorption. This segmentation enables both requirements to be met simultaneously in different regions.
Solution Approach 2:
The structure transitions from uniform solid material to a composite structure with locally differentiated properties, where slot-free areas provide mechanical strength and slotted areas provide acoustic damping.
3Object-generated harmful factors
If slots are made deep and numerous to maximize sound absorption, then sound damping is improved, but structural strength and resistance to deformation deteriorate
Solution Approach 1:
Instead of making the entire plate deeply slotted, only specific regions are slotted while other regions remain solid. This partial action approach achieves sufficient sound absorption without compromising overall structural strength.
Solution Approach 2:
Slots are concentrated in specific local regions where sound absorption is most needed, while other regions maintain full structural integrity. This localized slotting optimizes the strength-to-absorption ratio.
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 configuration achieves both effective sound absorption and improved mechanical durability by preventing slot area deformation and allowing for customizable slot profiles, thereby enhancing the overall performance of the sound absorber elements.
Implementation Method 1
a flat layered body made of at least two parallel absorber plates (8a, 8b) with a damping layer (10) lying between them
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The sound absorber element (2) for body sound attenuation in a a rail vehicle wheel (1) comprises at least two parallel absorber plates of which at least one is divided into tongue-like sections by at least one slit covered at least partially by another slit-free absorber plate. Independent claims are also included for: (A) a body sound absorber made up of such absorber elements for rail vehicle wheels; (B) a rail vehicle wheel with such body sound absorbers.