Levered Monopole-Dipole Resonators for Flexural Wave Absorption
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Solution Overview
Problem
Traditional sound absorption methods fail to effectively reduce flexural waves, which are the root cause of airborne noise, as they primarily target radiated sound rather than the underlying vibrations.
Innovation Solution
A system utilizing a monopole scatterer and a dipole scatterer, each with a lever, is coupled to a structure to absorb flexural waves, where the levers amplify the mass effect without increasing weight, and the scatterers resonate at similar frequencies to maximize energy absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If traditional sound absorbing materials are installed to reduce airborne noise, then airborne noise is reduced, but flexural wave transmission is not significantly impacted
Solution Approach 1:
The patent applies mechanical vibration principles by designing scatterers (monopole and dipole types) that resonate at specific frequencies to counteract flexural waves. The scatterers are tuned to resonate at the same frequency as the incident flexural wave, creating destructive interference that absorbs the wave energy. This is achieved through carefully designed mass-spring systems with specific resonant frequencies that match the flexural wave frequency.
Solution Approach 2:
The patent changes physical parameters by adjusting the mass, stiffness, and damping characteristics of the scatterers to optimize their resonant frequency. The monopole scatterer uses a mass attached to a spring with specific stiffness, while the dipole scatterer uses a similar configuration but oriented differently. These parameter adjustments allow the scatterers to effectively absorb flexural wave energy at targeted frequencies.
2Reliability
If high-mass structures are added to prevent vibration passage, then vibration transmission is reduced, but system weight increases
Solution Approach 1:
Instead of using high-mass structures, the patent employs resonant scatterers that use dynamic vibration cancellation. The monopole and dipole scatterers are designed with specific masses and spring stiffnesses to resonate at the flexural wave frequency, creating destructive interference that prevents vibration transmission without requiring large masses.
Solution Approach 2:
The patent uses a counteracting approach where the scatterers generate forces that oppose the flexural wave motion. The resonant oscillation of the scatterer masses creates counter-forces that cancel the incoming flexural wave energy, effectively preventing vibration transmission without adding significant weight.
3Reliability
If damping materials are applied to reduce vibration, then some vibration reduction is achieved, but flexural wave absorption is insufficient
Solution Approach 1:
The patent uses resonant mechanical vibration of the scatterers to absorb flexural wave energy. The monopole and dipole scatterers are tuned to resonate at the same frequency as the incident flexural wave, maximizing energy absorption through resonant coupling. This is more effective than passive damping materials because it targets the specific frequency of the flexural wave.
Solution Approach 2:
The scatterers perform periodic oscillation at their resonant frequency, which matches the frequency of the incident flexural wave. This periodic motion allows for continuous energy absorption from the passing wave, with each oscillation cycle extracting energy from the flexural wave through the resonant coupling between the scatterer and the structure.
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 system achieves 100% absorption of flexural wave energy by combining monopole and dipole scatterers with levers, reducing overall weight while significantly minimizing transmission and vibration.
Implementation Method 1
the monopole scatterer and/or the dipole scatterer include a lever connected to a mass
Implementation Method 2
the levers amplify the mass effect without increasing weight
Implementation Method 3
The monopole scatterer and the dipole scatterer may have substantially similar resonant frequencies
Data Source
AI summary
Disclosed are systems and devices for absorbing flexural waves using monopole and dipole resonance. In one example, a system includes a monopole scatterer coupled to a first side of a structure at a first location and a dipole scatterer coupled to a second side of the structure at a second location that at least partially overlaps the first location. At least one of the monopole scatterer and the dipole scatterer includes a lever.