Orthogonal Acoustic Isolator for Equal-Stiffness Vibration Damping
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Solution Overview
Problem
Current noise isolators for aircraft passenger compartments often fail to effectively dampen vibrations and noise due to inadequate damping and alignment issues, leading to a poor passenger experience.
Innovation Solution
The development of an acoustic isolator device with equal stiffness along all axes, featuring a symmetrical design that can be molded or injection-molded from materials like plastic, metal, or elastomers, with strategically placed coupling surfaces and apertures for secure attachment to vehicle panels and chassis, ensuring even load distribution and alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If traditional noise isolators are used to mount interior panels, then vibration and noise attenuation is provided, but alignment issues and inadequate damping occur leading to poor noise isolation performance
Solution Approach 1:
The isolator employs an orthogonal geometric design with four legs arranged asymmetrically in three-dimensional space, where each leg is oriented along a different axis (X, Y, Z directions). This asymmetric spatial arrangement provides equal stiffness along all three principal axes while enabling independent vibration isolation in each direction, resolving the alignment and damping inadequacies of traditional symmetric isolators
Solution Approach 2:
The patent modifies the geometric parameters of the isolator legs, specifically setting each leg length to approximately 0.625 inches with precise angular orientations. By changing these dimensional parameters and spatial arrangements, the isolator achieves equal stiffness in all three axes (Kx ≈ Ky ≈ Kz), thereby improving vibration and noise attenuation performance while maintaining reliability
2Object-affected harmful factors
If resilient materials are used to provide soft spring-like action for noise isolation, then vibration damping is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The isolator applies resilient material properties locally at specific contact points (the four leg feet) rather than throughout the entire structure. The main body remains as a simple orthogonal geometric form that is easy to manufacture, while only the critical vibration-isolating interfaces incorporate resilient characteristics through material selection or surface treatment
Solution Approach 2:
The patent employs composite construction by combining a rigid orthogonal geometric body (easy to manufacture from metal or plastic) with resilient material properties at the leg feet. This composite approach integrates the ease of manufacturing simple geometric shapes with the vibration damping benefits of resilient materials, achieving both goals simultaneously
3Object-affected harmful factors
If equal stiffness along all axes is achieved through symmetrical design, then vibration isolation in all directions is improved, but manufacturing precision requirements increase
Solution Approach 1:
The isolator segments the vibration isolation function into four independent legs, each responsible for isolating vibrations along specific axes. This segmentation allows each leg to be manufactured as a simple component with relaxed tolerance requirements, while the collective arrangement of all four legs achieves the overall equal stiffness property without requiring high precision in individual components
Solution Approach 2:
Each of the four legs serves multiple functions simultaneously: providing structural support, enabling vibration isolation in multiple directions, and contributing to the equal stiffness property. This multi-functionality reduces the need for additional precision-critical components and simplifies the overall manufacturing requirements while maintaining effective vibration isolation in all three axes
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 acoustic isolator device provides effective attenuation of structure-borne noise and vibration, enhancing passenger comfort while being economical and easy to manufacture, with the symmetrical design and resilient coating improving damping characteristics.
Implementation Method 1
Noise isolators can be developed that use resilient materials such as elastomers to mount interior panels and thus dampen vibration and noise that results from those interior panels
Data Source
AI summary
Technologies are generally described for an acoustic isolator that may be designed to have equal stiffness along all axes. Example acoustic isolator devices may include a symmetrical design, that may be formed by a molding process or plastic or metal, or alternatively by an injection process.