Acoustic Meta Structure Vibration Reduction Device
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Solution Overview
Problem
Current methods for reducing vehicle body vibrations and structure-borne noise, such as increasing panel thickness or using vibration dampers, are limited by increased manufacturing costs and vehicle weight.
Innovation Solution
A vibration reduction device with an acoustic meta structure, comprising periodically arranged unit structures with frames and vibrators, designed to create stop bands that block specific frequency ranges of vibration and noise, using a plastic material for the frame and vibrators, and optimizing the natural frequency and geometry of the vibrators to effectively reduce vibrations and noise across a wide range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional methods such as increasing panel thickness or adding reinforcement members are used to reduce vibration and noise, then vibration reduction effect is improved, but manufacturing cost and vehicle weight increase
Solution Approach 1:
The panel is divided into multiple unit structures, each containing frame members that segment the panel surface. This segmentation allows vibration isolation at localized regions without requiring overall panel thickening, thereby reducing weight while maintaining vibration reduction effectiveness
Solution Approach 2:
Vibration dampers are introduced as intermediary elements between the panel and the vehicle body structure. These dampers act as mediators that absorb and dissipate vibration energy, reducing noise transmission without increasing the panel thickness or overall vehicle weight
2Object-affected harmful factors
If conventional methods such as increasing panel thickness or adding reinforcement members are used to reduce vibration and noise, then vibration reduction effect is improved, but manufacturing cost increases
Solution Approach 1:
The vibration dampers are designed as relatively simple, inexpensive components that can be easily manufactured and replaced if necessary. This approach reduces manufacturing cost compared to conventional methods requiring thick panels or complex reinforcement structures
Solution Approach 2:
Vibration dampers serve as intermediary elements that provide effective vibration reduction at lower manufacturing cost. By introducing these specialized damping components, the system achieves better vibration control than conventional thick-panel designs without the associated high manufacturing costs
3Object-affected harmful factors
If a single natural frequency is used for the vibrators, then vibration blocking at that specific frequency is effective, but vibration and noise blocking range is limited
Solution Approach 1:
Multiple unit structures with different natural frequencies are distributed across the panel. Each unit structure targets a specific frequency range, and collectively they provide broad-spectrum vibration and noise blocking across multiple frequency bands
Solution Approach 2:
Different regions of the panel are equipped with unit structures having locally optimized natural frequencies based on the vibration characteristics of each region. This local quality approach enables effective vibration blocking across a wide frequency range by matching the damping characteristics to local vibration modes
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 device effectively blocks a wide range of vibrations and noise while reducing the weight of the vehicle body, achieving a significant reduction in noise and vibration levels, as demonstrated by experimental results showing improved insertion loss and vibration transfer functions.
Implementation Method 1
each of which has a natural frequency to block a vibration transmitted from the vehicle body through the frame
Implementation Method 2
a vibration reduction device having an acoustic meta structure
Implementation Method 3
frame mounted to the vehicle body and configured to separate a predetermined space into a predetermined number of separate sections formed by walls of the frame
Implementation Method 4
a mass portion which is formed at the other end of the connecting portion and configured to vibrate according to the vibration transmitted from the vehicle body through the frame
Data Source
AI summary
A vibration reduction device having an acoustic meta structure mounted to a vehicle body and configured to block a structure-borne noise transmitted through the vehicle body may include a plurality of unit structures arranged at a predetermined interval therebetween, wherein each of the unit structures includes frame mounted to the vehicle body and configured to separate a predetermined space into a predetermined number of separate sections formed by walls of the frame; and a vibrator formed at a corner portion of each of the separate sections and each of which has a natural frequency to block a vibration transmitted from the vehicle body through the frame.