Magneto-Rheological Pouch Tuning for Adaptive NVH Control
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Solution Overview
Problem
Existing methods for reducing noise, vibration, and harshness (NVH) in automotive applications are either expensive, heavy, or limited in their ability to adjust resonance frequencies effectively.
Innovation Solution
A device using a pouch filled with magneto-rheological material and coils to adjust resonance frequency by changing the material's properties through magnetic field activation, allowing for dynamic adjustment of NVH frequencies based on vehicle conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If sound barriers and foams are added to reduce NVH, then NVH reduction is achieved, but cost and weight increase
Solution Approach 1:
The patent uses magneto-rheological material whose stiffness can be dynamically changed by applying magnetic fields. By varying the magnetic field strength, the material's shear modulus changes, allowing dynamic adjustment of the resonance frequency of the pouch structure to match different NVH frequencies, achieving effective noise reduction without the weight penalty of traditional barriers
Solution Approach 2:
The invention replaces traditional passive mechanical sound barriers and foams with an active system using magneto-rheological material controlled by electromagnetic fields. This substitution enables dynamic tuning of vibration characteristics, providing superior NVH control with reduced weight and cost
2Object-affected harmful factors
If Helmholtz resonators are used to decrease NVH, then NVH reduction is achieved at specific frequencies, but the range and intensity of frequency adjustment is limited and requires big volumes
Solution Approach 1:
The magneto-rheological material's shear modulus can be continuously varied by changing the magnetic field strength, enabling wide-range adjustment of the pouch's resonance frequency. This provides superior adaptability compared to fixed-frequency Helmholtz resonators, allowing the system to track and counteract NVH across a broad frequency spectrum
Solution Approach 2:
The system transitions from static Helmholtz resonators with fixed resonance frequencies to a dynamic structure where the magneto-rheological material's properties can be changed in real-time. This enables the pouch to actively adapt its resonance frequency to match varying NVH conditions, significantly improving frequency adjustment range and intensity
3Object-affected harmful factors
If traditional sound barriers are used, then NVH reduction is achieved, but the solution is expensive and heavy
Solution Approach 1:
The magneto-rheological material allows a single pouch structure to provide NVH reduction across multiple frequencies by changing its stiffness parameter through magnetic field control. This eliminates the need for multiple heavy, expensive sound barriers tuned to different frequencies, reducing both material costs and manufacturing complexity
Solution Approach 2:
The pouch containing magneto-rheological material serves multiple functions: it can be tuned to different resonance frequencies to address various NVH issues, replacing multiple specialized components. This multi-functionality reduces the overall system cost and simplifies manufacturing while maintaining effective NVH control
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 efficiently and accurately adjusts resonance frequencies to reduce or enhance NVH as needed, providing a cost-effective solution for varying NVH conditions.
Implementation Method 1
one or more coils associated with the pouch; where the device is configured to activate the one or more coils associated with the pouch, which causes a property of the magneto-rheological material of the pouch to change
Implementation Method 2
a pouch including a magneto-rheological material, where the pouch has a resonance frequency of vibration; where the device is configured to activate the one or more coils associated with the pouch, which causes a property of the magneto-rheological material of the pouch to change and thereby shifts the resonance frequency of the pouch
Data Source
AI summary
A device for affecting noise, vibration, and harshness (NVH), for instance, reducing the NVH. The device includes a pouch, which further includes a magneto-rheological material. The pouch has a resonance frequency of vibration. The device further includes one or more coils associated with the pouch. The device is configured to activate the one or more coils associated with the pouch, which causes a property of the magneto-rheological material of the pouch to change and thereby shifts the resonance frequency of the pouch.