Vibration Isolation Mount Shear Wall Damping
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Solution Overview
Problem
Existing vibration and shock load isolation systems for spacecraft and vehicles face challenges in providing independent and widely controllable compliance in all directions without sacrificing strength, linearity, compactness, or weight, particularly in managing lateral vibrations effectively.
Innovation Solution
A low-profile, passively damped vibration isolation mount with a shear wall type constrained layer damping system, utilizing viscoelastic material layers and a flexure element with integrated flexure loop sections to achieve high damping and compliance in all directions, maintaining a high-strength, linear load path and minimizing weight and profile.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a three-axis vibration isolation device with independently controllable compliance is used, then compliance in all directions is improved, but longitudinal compactness deteriorates
Solution Approach 1:
The patent transitions from conventional beam-bending damping (one-dimensional) to shear wall type constrained layer damping (two-dimensional surface application). By applying the VEM-constraining layer assembly to vertical surfaces of the flexure element, the damping mechanism operates in a different dimensional space, enabling effective lateral vibration damping without increasing longitudinal profile.
Solution Approach 2:
The patent employs a composite damping system consisting of viscoelastic material (VEM) layers combined with stiff constraining layers. This composite structure creates the shear wall type constrained layer damping mechanism, where the interaction between the soft VEM and rigid constraining layers generates high passive damping forces that effectively control lateral vibrations while maintaining compact dimensions.
2Strength
If high strength and linear load-deflection performance is maintained in all directions, then strength and linearity are improved, but device size and weight increase
Solution Approach 1:
The patent utilizes parameter changes in the flexure element geometry, specifically optimizing the thickness and dimensions of the flexure loops to achieve the desired balance between strength, linearity, and weight. By carefully controlling the geometric parameters of the flexure element, the device maintains high strength and linear load-deflection performance while minimizing mass.
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 provides significant damping and compliance in all axes, reducing vibration load transmission while maintaining strength and linearity, and minimizing the overall size and weight of the payload-vehicle interface, thus enhancing the predictability and reliability of spacecraft and launch vehicle dynamics.
Implementation Method 1
a vibration isolation mount which... provides substantial damping and resulting reduction in vibration load transmission... by utilizing the shear wall type constrained layer damping introduced in the predecessor device
Implementation Method 2
utilizing the shear wall type constrained layer damping introduced in the predecessor device of U.S. Pat. No. 6,202,961
Implementation Method 3
has been the strength of the device disclosed in U.S. Pat. No. 6,202,961... provides an independently determinable compliance in all directions of vibration loading without sacrifice to strength and linearity of behavior
Data Source
AI summary
The invention disclosed is a low-profile, multi-axis, highly passively damped, vibration isolation mount which when used in multiplicity provides a complete vibration load isolation mounting system. The device provides in unique fashion a very low profile interface in combination with independently determinable compliance in all directions of vibration loading. Substantial passive damping is afforded without sacrifice to strength and linearity of behavior through adaptation of a shear wall type constrained layer damping. The result is a highly passively damped vibration isolation device that provides a very low profile interface, wide ranging longitudinal and lateral compliance management, in a durable, reliable, lightweight, and compact form.