Honeycomb Formwork for Low-Frequency Impact Sound Insulation
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Solution Overview
Problem
Existing floating floor systems inadequately address impact sound insulation at frequencies below 250 Hz, as conventional methods are less effective in reducing noise at these low frequencies, leading to disturbance in multistoried buildings.
Innovation Solution
A composite structure comprising a layer of force muting material and a half-closed or relaxed honeycomb structure as formwork, which creates air flow channels and reduces dynamic stiffness, effectively absorbing impact sound at low frequencies by optimizing the resonance frequency and contact area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If an insulation layer is introduced between the floor slab and the floating screed to decouple them, then impact sound transmission is reduced at higher frequencies, but sound waves still transmit through the insulation layer at frequencies below 250 Hz, reducing the insulating feature
Solution Approach 1:
The patent employs a porous elastomeric material as the insulating layer between the floor slab and floating screed. The porous structure allows the material to absorb and dissipate low-frequency sound waves through viscous friction and thermal conduction within the pores, while maintaining decoupling functionality. This resolves the contradiction by enabling effective low-frequency sound insulation without compromising the insulating feature.
Solution Approach 2:
The patent uses a composite structure combining an elastomeric insulating layer with specific mechanical and acoustic properties. The composite material integrates damping characteristics with insulation functionality, allowing it to simultaneously reduce impact sound transmission across all frequencies while maintaining its insulating feature at low frequencies below 250 Hz.
2Object-affected harmful factors
If the weight of the floating screed layer is increased to improve impact sound insulation, then sound absorption improves, but the load on the floor slab increases
Solution Approach 1:
The patent changes the parameter of the insulating layer from traditional dense materials to lightweight elastomeric materials with optimized density and damping characteristics. This allows achieving effective impact sound absorption through the floating screed system without increasing the weight of stationary objects, as the elastomeric layer provides acoustic damping while remaining lightweight.
Solution Approach 2:
The patent replaces the traditional mechanical approach of increasing mass for sound insulation with a viscoelastic damping mechanism. The elastomeric material dissipates sound energy through internal friction and hysteresis losses, substituting the need for heavy floating screed layers and thereby reducing the load on the floor slab while maintaining effective impact sound absorption.
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 composite structure significantly reduces impact sound at frequencies below 250 Hz, achieving a resonance frequency below 50 Hz and improved sound absorption, enhancing the comfort and noise reduction in buildings.
Implementation Method 1
The composite structure preferably has a resonance frequency below 250 Hz, preferably below 150 Hz, more preferably below 100 Hz, even more preferably below 80 Hz and most preferably below 50 Hz. Accordingly, the impact sound in floating floor systems is reduced at low frequencies
Implementation Method 2
The composite structure significantly reduces impact sound at frequencies below 250 Hz, achieving a resonance frequency below 50 Hz and improved sound absorption
Data Source
AI summary
A composite structure for a floating floor system including at least one layer of force muting material and a layer of formwork, wherein the layer of formwork is located on the at least one layer of force muting material wherein the layer of formwork is a half closed folded honeycomb structure or a relaxed honeycomb structure.