Frequency Shifting Isolator Design for Resonance Prevention
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Solution Overview
Problem
Existing shock and vibration protection systems require trial and error testing and destructive evaluation to ensure impact absorption, lacking a method to design frequency-shifting isolators that prevent resonance during impacts.
Innovation Solution
A technique for designing a frequency-shifting isolator system by establishing a desired impact absorption envelope, selecting geometry, and using elastomeric dampening materials to shift frequencies before resonance, incorporating structural design principles and material selection to meet displacement and momentum constraints.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional dampening materials are used for shock and vibration protection, then impact absorption is provided, but resonance occurs during impacts causing equipment damage
Solution Approach 1:
The isolator system employs dynamic stiffness adjustment where the stiffness of the isolator changes based on the displacement amplitude. At small displacements, the isolator provides soft support for vibration isolation, while at large displacements near resonance, the stiffness increases to shift the natural frequency away from the excitation frequency, preventing resonance damage.
Solution Approach 2:
The system changes the physical parameter of stiffness dynamically. The isolator is designed with non-linear characteristics where the effective stiffness increases with displacement amplitude, causing the natural frequency to shift as a function of displacement. This parameter change prevents the system from operating at resonant conditions during impacts.
2Reliability
If conventional isolator design methods are used, then basic shock protection is achieved, but design requires trial and error testing and destructive evaluation
Solution Approach 1:
The design methodology performs preliminary calculations using analytical models that incorporate the non-linear stiffness characteristics and displacement-dependent natural frequency. This allows the isolator geometry and material properties to be optimized before manufacturing, eliminating the need for extensive trial-and-error testing and destructive evaluation to determine if resonance protection is achieved.
3Reliability
If frequency shifting is implemented to prevent resonance, then equipment protection is improved, but isolator geometry and material selection become more complex
Solution Approach 1:
The isolator design incorporates specific geometric features at localized regions to achieve the non-linear stiffness characteristics. Rather than making the entire isolator complex, specific areas are designed with particular geometries (such as varying cross-sections or reinforcement patterns) that enable the displacement-dependent stiffness behavior needed for frequency shifting and resonance prevention.
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
Enables effective dampening of impacts without resorting to destructive testing or trial and error, allowing for the design of isolator systems that shift frequencies prior to resonance, thus preventing equipment damage and optimizing performance for various environments.
Implementation Method 1
providing an elastomeric dampening material that is formed in the selected geometry. The elastomeric dampening material is preferably configured to shift frequencies at predetermined displacements upon impact
Implementation Method 2
The elastomeric dampening material is preferably configured to shift frequencies at predetermined displacements upon impact within the desired impact absorption envelope
Data Source
AI summary
The present invention provides a method for designing a frequency-shifting isolator system that includes selecting, an impact absorption envelope; a geometry for the isolator mount system; and an elastomeric dampening material formed in the selected geometry. The isolator mount system is preferably configured to shift frequencies at predetermined displacements upon impact, at or before the system attains resonance.