Concrete Sleeper Elastic Sole Vibration Damping
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Solution Overview
Problem
Conventional slab tracks transmit vibrations and noise to neighboring areas due to the firm support of concrete sleepers on hard asphalt layers, which act as a mass-spring system, amplifying vibrations and noise in specific frequency ranges.
Innovation Solution
A concrete sleeper design featuring a sole made of an elastic material, such as EPDM, with a rounded outer edge step and a recessed underside to accommodate an elastomeric ring, allowing for increased mass distribution and reduced vibration transmission, along with a soft spring system to minimize noise and vibration emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the concrete sleeper is firmly supported on hard asphalt layers, then the stability and load-bearing capacity of the track is improved, but vibrations and noise are transmitted more strongly to neighboring areas
Solution Approach 1:
An elastic sole made of elastomer material is introduced as an intermediary element between the concrete sleeper and the hard asphalt base course. This mediator absorbs vibrations and reduces noise transmission while maintaining the necessary load-bearing capacity and stability of the track structure.
Solution Approach 2:
The physical parameters of the interface between sleeper and base course are changed by replacing direct rigid contact with an elastic layer. The elastomer sole provides controlled deformation characteristics that filter vibration frequencies, transforming the mass-spring system to reduce harmful vibrations and noise emission.
2Object-generated harmful factors
If a soft spring system is used to reduce vibrations, then vibration transmission is reduced, but the stability of the rail may be compromised
Solution Approach 1:
The elastic sole is designed as a composite structure combining elastomer material with specific geometric features (protrusions, recesses, and connection elements). This composite design provides both the softness needed for vibration reduction and the mechanical interlocking required for maintaining rail stability and preventing excessive movement.
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 elastic sole and ring configuration significantly reduce vibration transmission to the environment by increasing the mass on a soft spring system, minimizing noise and vibration impact, while maintaining stability and mechanical strength.
Implementation Method 1
a sole made of an elastic material is arranged on the underside of the concrete sleeper
Implementation Method 2
the elastic sole and ring configuration significantly reduce vibration transmission to the environment
Data Source
Figure 1~2
Figure 3
Figure 4
AI summary
The invention relates to a concrete sleeper (1) for a solid carriageway (23), having a fixing block (12), which is inserted with the upper section thereof into an underside recess (9) in the concrete sleeper (1), is mounted elastically by means of a ring (14) produced from an elastomer and which can be inserted with the lower section thereof into a fillable cut-out (19) in a top layer of the solid carriageway (23), wherein a base (7, 8) consisting of an elastic material is arranged on the underside of the concrete sleeper (1).