Soft-bodied fluidic actuator with electrostatic dielectric pumping
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Solution Overview
Problem
Conventional actuators often rely on rigid materials, limiting their flexibility and adaptability in applications requiring soft-bodied actuators that can efficiently interact with and control systems through fluidic amplification and self-healing mechanisms.
Innovation Solution
A soft-bodied actuator design featuring a dielectric fluid enclosed within a flexible bladder, with electrical conductors that, when energized, create an attractive force to pressurize the fluid, expanding an elastic membrane and exerting force externally, allowing for controlled movement and interaction with objects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If rigid materials are used in actuators, then structural strength and stability are improved, but flexibility and adaptability deteriorate
Solution Approach 1:
The actuator employs an elastic membrane as the primary structural component that can deform and expand. This membrane replaces traditional rigid structural elements, enabling the actuator to achieve both sufficient structural integrity and high flexibility. The elastic membrane allows the actuator to adapt its shape and volume in response to fluid pressure changes, resolving the contradiction between strength and flexibility.
Solution Approach 2:
The actuator utilizes a fluidic system where dielectric fluid is pumped into a sealed chamber between the elastic membrane and a rigid support structure. This pneumatic/hydraulic approach allows controlled expansion and contraction of the membrane, providing both the structural stability needed for force generation and the flexibility required for adaptive movement. The fluid pressure system enables precise control over the degree of expansion.
2Adaptability or versatility
If soft-bodied materials are used in actuators, then flexibility and adaptability are improved, but force generation capability deteriorates
Solution Approach 1:
The actuator design incorporates a rigid support structure that provides dimensional stability and force reaction, while the elastic membrane provides flexibility in another dimension. By combining soft and rigid elements in a layered configuration, the system achieves both adaptability and force generation capability. The rigid structure prevents collapse and provides the reaction force necessary for the soft membrane to generate useful output force.
Solution Approach 2:
The actuator combines elastic membrane material with rigid support structure and dielectric fluid in a composite system. This composite approach allows each material to contribute its advantageous properties: the elastic membrane provides flexibility and adaptability, the rigid structure provides force reaction and structural integrity, and the dielectric fluid provides controllable pressure generation. Together they achieve both soft-bodied adaptability and sufficient force generation.
3Adaptability or versatility
If fluidic amplification is implemented, then adaptability is improved, but device complexity deteriorates
Solution Approach 1:
The actuator employs a self-contained fluidic system where the dielectric fluid serves multiple functions: it provides structural support when pressurized, acts as an electrical insulator between the conductive membrane and support structure, and enables controlled expansion through pumping. This multi-functional fluid approach reduces the need for separate systems for each function, thereby reducing overall device complexity while maintaining high adaptability.
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 actuator achieves flexible and controlled force application, enabling efficient interaction with objects while maintaining energy efficiency and adaptability, as it can self-activate and deactivate by managing fluid flow within its fluidic system.
Implementation Method 1
a first application of electrical energy to the first and second conductors produces an attractive force between the first conductor and the second conductor, drawing the first conductor and the second conductor toward each other
Implementation Method 2
Motion of the first conductor and the second conductor toward each other pressurizes the dielectric fluid in the first enclosure so as to force the dielectric fluid to flow from the first enclosure into the second enclosure
Data Source
AI summary
An actuator includes a first enclosure, a dielectric fluid in the first enclosure, and a second enclosure in fluid communication with the first enclosure. An elastic membrane defines at least a portion of the second enclosure. A first electrical conductor is positioned along a first side of the first enclosure. A second electrical conductor is positioned along a second side of the first enclosure opposite the first side. The second conductor is spaced apart from the first conductor. The conductors are connected to a power source. Application of electrical energy to the first and second conductors produces an attractive force between the conductors. Motion of the conductors toward each other pressurizes the dielectric fluid so as to force the dielectric fluid to flow from the first enclosure into the second enclosure. The flow of the dielectric fluid exerts a force on the elastic membrane which expands the elastic membrane.