Vibration Isolator With Decoupled Axial and Lateral Modes
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Solution Overview
Problem
Existing vibration isolation systems fail to decouple axial and lateral structural modes independently, leading to coupled frequency responses that hinder effective vibration mitigation across orthogonal directions, particularly at high and low frequencies.
Innovation Solution
A vibration isolator system comprising an axial flexural support and a lateral elastomeric support, where the axial flexural support provides axial compliance and lateral stiffness, and the lateral elastomeric support provides lateral compliance, allowing for independent tuning of axial and lateral structural modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pure elastomeric isolation mechanism is used, then high frequency vibration isolation is improved, but low frequency performance deteriorates when axial and lateral modes need to be different
Solution Approach 1:
Different regions of the isolator have different compliance characteristics: the flexure elements provide high axial compliance with low lateral compliance, while the elastomeric elements provide lateral compliance. This local differentiation of mechanical properties enables independent tuning of axial and lateral modes, resolving the contradiction between high frequency isolation and mode independence.
Solution Approach 2:
The isolator segments the compliance functions into axial (flexure) and lateral (elastomeric) components. This allows independent design and tuning of each directional mode, enabling the axial mode to be optimized for one frequency while lateral modes are optimized for another, achieving the required adaptability.
2Device complexity
If translational structural modes in three orthogonal directions are coupled, then device complexity is reduced, but manufacturing precision deteriorates when specific mode frequencies need to be controlled
Solution Approach 1:
The isolator segments the three orthogonal translational modes into independent control groups: axial mode controlled by flexure elements and lateral modes controlled by elastomeric elements. This segmentation decouples the mode frequencies, allowing precise control of each mode independently while maintaining relatively simple device geometry and assembly procedures.
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 system effectively decouples axial and lateral structural modes, enabling independent tuning and minimizing vibration propagation between external structures, thereby improving vibration isolation across a broader frequency range.
Implementation Method 1
an axial flexural support that is configured to provide axial compliance relative to a central axis
Implementation Method 2
a lateral elastomeric support that is configured to provide lateral compliance relative to the central axis
Data Source
AI summary
A vibration isolator, system, and method for minimizing propagation of vibrations between structures are configured to decouple axial and lateral structural modes. The vibration isolator includes an axial flexural support that provides axial compliance relative to a central axis and a lateral elastomeric support that provides lateral compliance relative to the central axis. The axial flexural support and the lateral elastomeric support provide stiffness about the central axis. The vibration isolator includes a first mount coupled to a first external structure and a second mount coupled to a second external structure. The axial flexural support is coupled to the first mount and the lateral elastomeric support is coupled to the second mount and the axial flexural support. Using an axial flexural support and a lateral elastomeric support enables tuning of the structural modes in one axis while minimizing the effects to the structural modes in the orthogonal axes.