Deformable Sensor Stiffness via Magnetic Repulsion
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Solution Overview
Problem
Robots lack the ability to adaptively modify their interaction with objects of varying fragility and stiffness in real-time, often resulting in damage due to insufficient touch sensitivity and limited information about object geometry and pose.
Innovation Solution
A deformable sensor system comprising a membrane coupled to a housing with a magnetic repulsion mechanism that allows for real-time modification of stiffness by adjusting the distance between magnets or the strength of an electrified coil, enabling variable force-displacement characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a deformable sensor uses a fixed stiffness membrane structure, then the sensor provides consistent mechanical properties, but the robot cannot adapt to objects of varying fragility and stiffness in real-time
Solution Approach 1:
The patent applies the dynamics principle by making the membrane stiffness variable rather than fixed. A magnetic object positioned within the sensor cavity generates magnetic repulsion force that dynamically adjusts the membrane's stiffness. This allows the sensor to adapt its mechanical properties in real-time based on the fragility of objects being manipulated, resolving the contradiction between adaptability and complexity by using a simple dynamic mechanism rather than a complex reconfigurable structure.
Solution Approach 2:
The patent implements parameter changes by modifying the magnetic repulsion force parameter to control membrane stiffness. By changing the position or strength of the magnetic object, the system alters the repulsion force, which directly changes the membrane's stiffness parameter. This enables continuous adjustment of mechanical properties without structural reconfiguration, achieving adaptability while maintaining relatively simple device architecture.
2Reliability
If a robot uses fixed interaction force with objects, then the control system is simple, but the robot causes damage to fragile objects due to insufficient touch sensitivity
Solution Approach 1:
The patent applies feedback by using the deformable membrane's physical deformation as a direct indicator of contact force and object properties. The membrane's stiffness change in response to magnetic repulsion provides real-time feedback about the interaction state, enabling the control system to adjust forces automatically. This feedback mechanism protects fragile objects by preventing excessive force application while maintaining simple control architecture through passive mechanical sensing.
Solution Approach 2:
The deformable sensor system performs self-service by automatically sensing and responding to object properties through its own mechanical deformation. The membrane's inherent deformability allows it to sense contact conditions and the magnetic repulsion mechanism automatically adjusts stiffness without external control intervention. This self-regulating capability protects fragile objects while avoiding complex active control systems.
3Measurement precision
If a deformable sensor increases its stiffness to manipulate rigid objects, then the manipulation precision improves, but the sensor cannot properly contact fragile objects without causing damage
Solution Approach 1:
The patent resolves this contradiction by implementing dynamic stiffness adjustment. The membrane's stiffness can be increased through magnetic repulsion when manipulating rigid objects, providing the necessary manipulation precision. Conversely, when dealing with fragile objects, the magnetic repulsion force can be reduced to decrease stiffness, allowing gentle contact and preventing damage. This dynamic adaptability enables the sensor to optimize its mechanical properties for different object types without compromising either precision or safety.
Solution Approach 2:
The patent uses parameter changes by adjusting the magnetic repulsion force parameter to match the stiffness requirements of different objects. For rigid objects, stronger repulsion increases membrane stiffness, improving manipulation precision. For fragile objects, weaker repulsion decreases stiffness, reducing harmful contact forces. This continuous parameter adjustment allows the system to achieve both high precision and object safety across different manipulation scenarios.
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
Enables robots to accurately grasp and manipulate objects of varying fragility by adapting stiffness in real-time, reducing the risk of damage and improving interaction precision.
Implementation Method 1
The magnetic object may be configured to modifiably repel the first magnet and modify stiffness of the deformable sensor
Data Source
AI summary
Deformable sensors and methods for magnetically modifying membrane stiffness are provided. A deformable sensor may include a membrane coupled to a housing to form a sensor cavity. The deformable sensor may further include a first magnet located on an inner surface of the membrane in the sensor cavity. The deformable sensor may additionally include a magnetic object located at a base within the sensor cavity. The magnetic object may be configured to modifiably repel the first magnet and modify stiffness of the deformable sensor based upon the modified repulsion.