Tram Rail Sound Damping Device with Clamped Chamber Elements
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Solution Overview
Problem
Soundproofing devices on tram rails face issues with gaps widening due to thermal expansion and shrinkage of chamber filling elements, leading to loosening, especially under temperature fluctuations.
Innovation Solution
Incorporating clamping devices and clip-shaped connecting bodies with engagement recesses to firmly connect adjacent chamber filling elements, ensuring minimal gap widening, and using material-saving recesses to enhance cohesion between elongated shaped bodies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If chamber filling elements are installed during summer temperatures, then they are lengthened by thermal expansion, but they shrink in winter temperatures leading to gaping gaps between the moldings
Solution Approach 1:
The patent applies parameter changes by modifying the physical state of the connection moldings through compression. The moldings are compressed to a density of 0.9-1.1 g/cm³, which reduces their thermal expansion coefficient and minimizes dimensional changes across temperature fluctuations. This parameter modification allows the chamber filling elements to maintain stable dimensions despite wide temperature variations.
Solution Approach 2:
The patent implements preliminary anti-action by pre-compressing the connection moldings during installation to counteract the natural tendency to shrink in cold temperatures. The clamping devices apply continuous compressive force to the moldings, creating a preliminary compressive stress that compensates for thermal contraction, thereby preventing gap formation between chamber filling elements.
2Reliability
If the moldings are installed during the day in summer temperatures, then they are lengthened by thermal expansion, but they shrink in winter temperatures, which leads to gaping gaps between the moldings
Solution Approach 1:
The patent applies dynamics by using clamping devices that can dynamically adjust and maintain continuous compressive force on the connection moldings. The clamping devices are designed to accommodate thermal expansion and contraction while maintaining constant pressure, ensuring the moldings remain firmly connected throughout temperature cycles without developing gaps.
Solution Approach 2:
The patent uses composite materials by combining the connection moldings made of soundproofing material with the clamping devices. The composite system of compressed molding material and mechanical clamping creates a more reliable connection than either component alone, maintaining cohesion under temperature variations through the synergistic effect of material compression and mechanical constraint.
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 effectively maintains a secure bond between soundproofing elements across varying temperatures, preventing gaps from widening and ensuring consistent soundproofing performance.
Implementation Method 1
Soundproofing devices on tram rails are widely known and have chamber filling elements made of soundproofing material
Implementation Method 2
thermal expansion and shrinkage can cause the gaps between the shaped bodies to widen
Data Source
Figure 1~3
Figure 4~5
Figure 6~7
AI summary
Sound-damping device on tram rails (1) having chamber-filling elements (2) made of sound-damping material, the side faces (36; 136) of which have engagement cutouts (33, 43) near to the end faces (24; 34; 44), wherein clamp-shaped connecting elements (5) engage with clamp projections (51, 52) into the engagement cutouts (33, 43) and clamp adjacent chamber-filling elements to one another.