Plate Bending Wave Absorber With Mechanical Resonators
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Solution Overview
Problem
Current plate bending wave absorption systems fail to achieve perfect absorption of bending waves, leading to structural vibration and noise propagation in vehicles, particularly when using high strength-to-mass ratio materials.
Innovation Solution
A plate or beam system decorated with mechanical resonators, including a rigid mass component and a connecting element, such as a spring or flexible rubber, configured to absorb bending waves by maintaining the rigid mass component at an elevated distance from the surface, with resonators spaced based on the wavelength of the bending wave, achieving perfect absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If high strength-to-mass ratio materials are used for beams and plates, then weight is reduced, but acoustic qualities deteriorate and structural vibration propagates
Solution Approach 1:
Mechanical resonators are introduced as intermediary elements coupled to the plate surface. These resonators act as mediators that interact with bending waves through resonance, converting structural vibration energy into resonator motion that can be dissipated, thereby reducing noise propagation from lightweight structures
Solution Approach 2:
The invention utilizes mechanical resonance by tuning the resonators to specific frequencies matching the bending wave frequencies. The resonators vibrate in response to incident bending waves, creating a resonance effect that enhances energy absorption and reduces the transmission of vibrational energy through the structure
2Object-generated harmful factors
If conventional absorption methods are used, then some noise reduction is achieved, but perfect bending wave absorption cannot be realized
Solution Approach 1:
The invention optimizes specific parameters including resonator mass, stiffness, damping coefficients, spacing, and coupling strength to achieve critical coupling conditions. By precisely tuning these parameters, the system reaches perfect absorption where the absorption coefficient reaches unity, overcoming the limitations of conventional methods that achieve only partial absorption
3Object-generated harmful factors
If mechanical resonators are added to achieve absorption, then noise reduction improves, but device complexity increases
Solution Approach 1:
Instead of modifying the entire plate structure, the invention applies resonators only at specific locations and orientations where they are most effective. The resonators are strategically placed and oriented to target specific bending wave modes, achieving effective noise reduction with minimal added complexity concentrated at key points rather than distributed throughout the entire 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 effectively blocks and absorbs bending waves, reducing noise propagation and structural vibration, with absorption rates exceeding 80% and customizable designs for various applications.
Implementation Method 1
The connecting element can be a spring; a flexible rubber component with an axial stiffness; or a base connecting component with a flexible arm
Implementation Method 2
Each mechanical resonator includes a rigid mass component and a connecting element. The mechanical resonators are configured to block or absorb bending waves that propagate through the longitudinally extending base plate
Data Source
AI summary
An acoustic system is provided for the perfect absorption of bending waves. The acoustic system includes a longitudinally extending substrate (plate or beam) defining upper and lower opposing major surfaces. At least two mechanical resonators are coupled to the upper major surface and separated by a distance dimension that may be based on a fraction of a magnitude of the wavelength of a selected bending wave. Each mechanical resonator includes a rigid mass component and a connecting element. The mechanical resonators are configured to block or absorb bending waves that propagate through the substrate. The connecting elements maintain the rigid mass component an elevated distance from the upper major surface of the beam when in a rest position. The connecting element can be a spring and damper; a flexible rubber/plastic component with an axial stiffness; or a base connecting component with a flexible arm, optionally with vibration damping.