Segmented Sandwich Damping Plate for Engine Vibration Control
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Solution Overview
Problem
Existing vibration damping solutions for internal combustion engines, such as oil pans and transmission covers, face challenges in effectively reducing vibrations and noise, particularly in diesel engines, where increased combustion pressure leads to high-frequency vibrations, and lighter materials exacerbate susceptibility to vibrations and noise generation.
Innovation Solution
A sandwich damping plate with a relatively less rigid elastomer layer sandwiched between two more rigid metal layers, featuring cuts or grooves that extend through both layers to create discontinuous rigid layers, reducing direct vibration transmission paths and enhancing shear deformation for effective damping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a sandwich damping plate with continuous rigid layers is used, then vibration damping is provided, but oil leakage occurs between the engine block and oil pan
Solution Approach 1:
The continuous rigid layers are segmented by introducing cuts or grooves that extend through both rigid layers, creating discontinuous segments. This segmentation allows the damping plate to deform under vibration while maintaining sealing capability at the discontinuous interfaces, preventing oil leakage that occurs in continuous layer designs
2Weight of moving object
If lighter materials are used to reduce vehicle weight, then weight reduction is achieved, but susceptibility to vibrations and noise increases
Solution Approach 1:
The damping plate uses a composite structure with alternating rigid and resilient layers. The rigid layers (metal or composite) provide structural strength and vibration resistance, while the resilient layers (elastomer or rubber) provide damping. This composite construction allows use of lighter materials overall while maintaining vibration resistance through the alternating layer structure
3Strength
If the rigid layers are made continuous to provide structural strength, then structural integrity is improved, but direct vibration transmission paths are created
Solution Approach 1:
The rigid layers are divided into discontinuous segments by cuts or grooves extending through both rigid layers. This segmentation breaks direct vibration transmission paths while maintaining structural integrity through the distributed rigid segment structure and support from resilient layers
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 reduces vibrations and noise by transforming vibration energy into thermal energy through shear deformation and isolating vibrations, preventing direct transmission across the damping plate, thereby improving vibration damping in automotive parts like oil pans and other enclosure articles.
Implementation Method 1
enhancing shear deformation for effective damping
Implementation Method 2
a relatively less rigid elastomer layer sandwiched between two more rigid metal layers
Implementation Method 3
isolating vibrations, preventing direct transmission across the damping plate
Data Source
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AI summary
A vibration damped enclosure comprises side walls and a vibration damping plate structure which extends across the enclosure and is attached to internal surface portions of a first and a second side walls. The vibration damping plate structure (2) comprises a non-rigid layer (12) sandwiched between two rigid layers (13, 14), wherein each rigid layer between the first and second side walls (5, 6) comprises at least one cut (15, 16) through the rigid layer (13, 14) which makes the extension of each rigid layer between the first and second sidewalls (5, 6) discontinuous.