Tri-Adaptive Metamaterial Cell for Shock and Vibration Isolation
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Solution Overview
Problem
Conventional shock and vibration protection systems for vehicles, buildings, and equipment are hindered by the addition of weight, volume, and cost, as well as limited effectiveness in severe shock and vibration scenarios, particularly for heavy equipment and large-scale applications.
Innovation Solution
A tri-adaptive apparatus comprising a unit cell with nonlinear springs and restrainers that form a dynamic force isolation and dampening metamaterial, reducing the transmission of vibrational and impact forces through frictional sliding contact and energy dissipation, allowing for adaptable protection without significant weight or volume increase.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hardening structures and reinforcements are added to protect against shock and vibration, then protection effectiveness is improved, but weight and volume increase
Solution Approach 1:
The patent changes the mechanical parameters of the protective material by using a nonlinear spring whose stiffness varies with compression depth. The spring provides a progressive resistance force that adapts to the applied load, achieving effective shock protection without requiring excessive material quantity or weight.
Solution Approach 2:
The protective device combines multiple functional elements into a composite structure: nonlinear springs for energy absorption, dashpots for viscous damping, and friction elements for Coulomb damping. This composite approach achieves superior shock and vibration protection while maintaining compact dimensions and reduced weight compared to conventional homogeneous protective structures.
2Reliability
If absorptive and dampening materials are used to reduce shock and vibration effects, then protection effectiveness is improved, but volume consumption increases
Solution Approach 1:
The protective device is segmented into distinct functional components (nonlinear springs, dashpots, friction elements) that work together in a compact arrangement. This segmentation allows for efficient space utilization and achieves effective protection with reduced overall volume compared to bulk absorptive materials.
Solution Approach 2:
The nonlinear spring's variable stiffness characteristic allows it to provide effective protection across a wide range of shock intensities without requiring excessive volume. The spring transitions from a compliant state during initial contact to a stiffer state during severe impacts, achieving high protection effectiveness in a compact form factor.
3Weight of moving object
If traditional cushioning materials like solid foam are used, then lightweight protection is achieved, but protection effectiveness against severe shock and vibration is insufficient
Solution Approach 1:
The protective device employs dynamic elements including nonlinear springs with varying stiffness, dashpots providing velocity-dependent damping, and friction elements that engage under load. These dynamic components adapt their protective characteristics in real-time based on the applied shock or vibration intensity, achieving superior protection effectiveness while maintaining lightweight construction.
Solution Approach 2:
The device combines multiple damping mechanisms (elastic, viscous, and friction damping) in a composite structure that provides progressive protection. This composite approach delivers effective severe shock protection while remaining lightweight, overcoming the limitations of traditional single-material cushioning solutions.
4Reliability
If active and passive vibration control devices are used to reduce severe shock and vibration effects, then protection effectiveness is improved, but weight, size and cost increase significantly
Solution Approach 1:
The protective device is self-regulating and requires no external power source or control system. The nonlinear spring automatically adjusts its stiffness, the dashpot provides passive viscous damping proportional to velocity, and the friction element engages based on applied load. This self-service mechanism achieves effective severe shock protection while minimizing weight and complexity.
Solution Approach 2:
The device uses intermediate elements (the nonlinear spring, dashpot, and friction component) that mediate between the applied shock and the protected object. These intermediaries progressively absorb and dissipate energy through multiple mechanisms, providing effective protection without requiring heavy active control systems.
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 tri-adaptive apparatus effectively reduces dynamic force transmission, providing controlled vibration protection across a wide range of excitations while maintaining a lightweight and compact design, thus overcoming the limitations of traditional systems.
Implementation Method 1
the at least one spring configured for expanding and contracting laterally in the direction of the at least one restrainer upon being subjected to dynamic forces from the dynamic force source, thereby bringing the at least one spring into frictional sliding contact with the at least one restrainer and forming an at least one energy dissipative dashpot therebetween
Implementation Method 2
A tri-adaptive apparatus configured for functioning as a dynamic force isolation and dampening metamaterial that reduces the transmission of vibrational and impact forces
Data Source
AI summary
A tri-adaptive apparatus is disclosed and configured for functioning as a dynamic force isolation and dampening metamaterial that reduces the transmission of dynamic forces between a dynamic force source and an object. In at least one embodiment, the apparatus provides at least one cell unit that provides a pair of opposing first and second cell plates, between which is positioned at least one spring, restrainer and dashpot. An outer surface of the first cell plate is positioned in contact with the dynamic force source. An outer surface of the second cell plate is positioned in contact with the object. The at least one spring, restrainer and dashpot are configured for transferring dynamic force energy mutually between one another while deforming mechanically in response to the dynamic forces transmitted by the dynamic force source.