Asymmetric Soft Robotic Actuators With Tunable Variable Walls
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Solution Overview
Problem
Existing soft robotic manipulators have limited actuation capabilities and are not well-suited for manipulating delicate or varied objects, as they often rely on rigid skeletons and lack adaptive design frameworks for quantitative modeling.
Innovation Solution
The development of soft robotic actuators with a flexible or elastic elongate body that can be pressurized or depressurized to bend, featuring a repeating variable wall portion and tunable parameters such as wall thickness and pitch, allowing for specific pressure-actuated changes and designed using quantitative modeling techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If rigid robotic skeletons with conventional bearings are used, then structural strength and stability are improved, but adaptability for manipulating delicate or varied objects deteriorates
Solution Approach 1:
The patent replaces rigid robotic skeletons with flexible soft robotic actuators composed of compliant materials. These actuators use flexible shells and thin film structures that can conform to and adapt to the shapes of delicate or varied objects, enabling gentle manipulation while maintaining structural integrity through material properties rather than rigid frameworks
Solution Approach 2:
The soft robotic actuators utilize composite material structures combining flexible polymers, elastomers, and potentially reinforced with textile or fiber networks. This composite approach provides both the compliance needed for adaptability and the structural strength required for functional operation, resolving the trade-off between rigidity and flexibility
2Ease of operation
If McKibben-type actuators with braided mesh shells are used, then contraction and extension capability is improved, but actuation versatility deteriorates due to single mode operation
Solution Approach 1:
The soft robotic actuator is divided into multiple segmented chambers or compartments along its length, each capable of independent pressurization or depressurization. This segmentation enables complex motion patterns including bending, twisting, and elongation by coordinating the actuation of individual segments, transforming a single-mode actuator into a multi-functional system
Solution Approach 2:
The patent implements dynamically adjustable actuation by allowing real-time modification of internal chamber pressures. The actuator can transition between different motion modes (contraction, expansion, bending in various directions, twisting) by dynamically redistributing pneumatic pressure among chambers, providing versatility while maintaining ease of operation through a single pneumatic interface
3Adaptability or versatility
If soft robotic actuators with flexible bodies are used, then adaptability for manipulating delicate objects is improved, but structural stability deteriorates
Solution Approach 1:
The actuator employs carefully engineered flexible shells and thin film walls with controlled thickness and material properties. These structures provide sufficient structural stability to maintain actuator shape and resist external forces during operation, while remaining compliant enough to adapt to delicate objects. The shell design incorporates geometric features that enhance stability without compromising flexibility
4Measurement precision
If repeating variable wall portions with tunable parameters are implemented, then motion precision and control are improved, but device complexity increases
Solution Approach 1:
The patent achieves motion precision through parameter changes in the wall portions rather than complex mechanical structures. By varying wall thickness, material stiffness, or geometric dimensions of the repeating wall segments, the actuator can be tuned to produce specific curvature radii and bending behaviors. This parametric design approach enables precise motion control while keeping the overall device structure relatively simple and manufacturable
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
These actuators provide a broad dynamic range, reduced strain, and improved reproducibility, enabling more sophisticated motions and applications, such as grasping and surgical instruments, with enhanced control and reduced mechanical interference.
Implementation Method 1
a flexible or elastic elongate body that defines a sealed void which can be pressurized or depressurized relative to the environment surrounding the actuator... Pressurizing or depressurizing the flexible or elastic elongate body causes at least a part of the flexible or elastic elongate body, and thus the actuator, to bend
Data Source
AI summary
A soft robotic actuator is disclosed. The actuator includes a first portion with a substantially constant profile and a second portion with a regularly varying profile, and bends in a pressure-dependent fashion as the internal pressure within the actuator is increased or decreased.