Backing Plate Resonant Frequency Attenuation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Brake pads in motor vehicle brake systems experience undesirable vibrations and noise due to excitation by the braking surface and vehicle drive train components, leading to 'brake squeal' as a result of resonant frequency alignment, which existing backing plates fail to effectively attenuate.
Innovation Solution
A backing plate with radially vent channels is designed to adjust its resonant frequency away from excitation frequencies through manipulation of geometry and mass, using metal injection molding to integrate channels that provide fluid communication and reduce material usage, thereby acting as a vibration-damping element.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If traditional solid backing plates are used, then structural strength is maintained, but vibration and brake noise increase due to resonant frequency alignment
Solution Approach 1:
The backing plate incorporates a porous damping material with controlled porosity (30-70%) filled within its structure. This porous material absorbs vibrational energy and dampens resonance, reducing brake noise while maintaining structural integrity through the composite construction of metal plate combined with damping material
Solution Approach 2:
The backing plate uses a composite structure combining metal material with viscoelastic damping material or porous material. This composite approach allows the metal component to provide structural strength while the damping material suppresses vibrations and resonant frequencies that cause brake noise
2Object-affected harmful factors
If damping materials are added to reduce vibration, then brake noise decreases, but device complexity increases
Solution Approach 1:
The damping material is integrated directly into the backing plate structure through coating, bonding, or co-forming processes, creating a unified composite component. This merging eliminates the need for separate damping components and simplifies the overall brake assembly while maintaining noise reduction effectiveness
3Weight of moving object
If material is removed to reduce mass, then weight decreases, but structural strength may be compromised
Solution Approach 1:
The porous damping material provides internal voids that reduce overall density and weight of the backing plate while the porous structure itself contributes to vibration damping. The controlled porosity (30-70%) optimizes the balance between weight reduction and structural performance
Solution Approach 2:
The composite construction allows strategic placement of lighter damping materials in specific zones where they provide maximum vibrational control, enabling weight reduction in non-critical areas while maintaining strength in load-bearing regions through the metal component
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 solution effectively suppresses brake noise by breaking the chain of vibrating elements and reducing material and weight, while also improving heat dissipation through ventilation, thus minimizing noise and enhancing braking performance.
Implementation Method 1
The backing plate is configured to achieve a resonant frequency that attenuates vibration
Implementation Method 2
improving heat dissipation through ventilation
Data Source
AI summary
A backing plate comprises a front side configured to engage a friction material, a rear side opposite the front side, a first edge, a second edge generally opposing the first edge, and at least one channel disposed between the front side and the rear side and extending from the first edge toward the second edge. The rear side is configured to engage a caliper assembly. The backing plate is configured to achieve a resonant frequency that attenuates vibration.