Electrostatic Variable Stiffening Device with Pinched Electrode Extensions
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Solution Overview
Problem
Current variable stiffening devices are bulky and operate at low efficiencies, particularly when using external vacuums to achieve a more rigid state, necessitating a low-profile and on-demand solution.
Innovation Solution
A variable stiffening device with electrode structures that include electrode extensions pinched between engaging surfaces of opposing electrodes, utilizing a voltage source to electrostatically retain the extensions within cavities, maintaining structural relationships and supporting loads through friction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If external vacuum is used to compress layers of a device to achieve a more rigid state, then the device rigidity is improved, but the device becomes bulky and operates at low efficiency
Solution Approach 1:
The patent removes the external vacuum system entirely and replaces it with internal electrostatic actuation. The electrode structures are integrated directly into the morphing structure layers, eliminating the need for external vacuum equipment while achieving the same rigidity enhancement through electrostatic compression of dielectric layers.
Solution Approach 2:
The patent replaces the mechanical external vacuum system with an electrostatic field-based actuation system. Instead of using mechanical compression via vacuum, the invention uses electric fields to deform dielectric layers, thereby substituting a mechanical system with an electrical field-based system that is more compact and efficient.
2Strength
If external vacuum is used to compress layers of a device to achieve a more rigid state, then the device rigidity is improved, but the operational efficiency decreases
Solution Approach 1:
The patent enables rapid switching between rigid and flexible states through periodic application of voltage to the electrode structures. The electrostatic actuation can be activated and deactivated quickly, allowing the device to transition between states on-demand with high operational efficiency, unlike the continuous operation required by external vacuum systems.
Solution Approach 2:
The integrated electrode structures are self-contained within the morphing structure layers, allowing the device to actuate itself without external equipment. The electrode structures directly compress the dielectric layers through electrostatic forces, eliminating the need for external vacuum systems and improving operational efficiency through direct, on-demand actuation.
3Device complexity
If electrode extensions are pinched between opposing electrodes to maintain structural relationship, then the device becomes compact and efficient, but the manufacturing precision requirements increase
Solution Approach 1:
The patent uses flexible printed circuit board (FPC) substrates to support the electrode structures. The FPC substrates provide a flexible yet precise platform that allows the electrode extensions to be positioned accurately between opposing electrodes while maintaining device compactness. The flexibility of the FPC enables precise alignment to be achieved through bending and folding rather than rigid precision manufacturing.
Solution Approach 2:
The patent employs dynamic folding and bending of the electrode structures to achieve precise alignment between opposing electrodes. Rather than requiring high precision in the initial manufacturing of electrode positions, the design allows the electrodes to be brought into alignment through controlled mechanical deformation of the flexible substrate, thereby reducing manufacturing precision requirements while maintaining compact device geometry.
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 enables a compact, efficient transition between non-load-bearing and load-bearing states, capable of supporting significant loads relative to the device's weight, with the ability to maintain structural integrity under external forces.
Implementation Method 1
applying voltage generated by the voltage source to the electrode pair, thereby electrostatically drawing electrodes of the electrode pair together
Implementation Method 2
the electrode extension is retained within the cavity via the engaging surfaces to maintain a structural relationship
Data Source
AI summary
A variable stiffening device that include a first electrode structure and a second electrode structure. The first electrode structure includes an electrode extension that extends into a cavity defined between an electrode of the first electrode structure and an opposing electrode of the second electrode structure. The first and second electrode structures may be arranged in a load-bearing state by applying a voltage thereto to electrostatically attract the electrode to the opposing electrode to press the electrode extension within the cavity. Friction between the electrode extension and engaging surfaces defining the cavity prevent the electrode extension from slipping within the cavity, thereby maintaining a structural relationship among the components of the first and second electrode structures in response to an application of a load to the variable stiffening device.