Pneumatic Skeletal Joints for Safe Robotic Motion
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Solution Overview
Problem
Existing robotic systems face challenges in achieving safe and compliant joint actuation for interactive tasks with humans, as they often require complex and expensive hydraulic or electric actuators to manage speed and power, which are not suitable for less precise movements or expressive actions needed in entertainment and human-interactive settings.
Innovation Solution
A pneumatically actuated joint system using opposing air bladders within a housing, where differential pressures control the movement of skeletal links, providing expressive and compliant motion while ensuring safety through flexible materials and pressure control mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If hydraulic or electric actuators are used to control robot joints, then speed and power can be precisely controlled, but the system becomes complex and expensive
Solution Approach 1:
The patent applies pneumatic actuators using gas-filled bladders to replace complex hydraulic or electric actuator systems. The gas pressure directly actuates the joint through a piston mechanism, providing sufficient power for expressive movements while dramatically reducing system complexity and cost. The pneumatic system eliminates the need for complex control electronics, hydraulic fluid management, and precision mechanical components.
Solution Approach 2:
The patent changes the actuation parameter from electrical/hydraulic control to gas pressure control. By using variable gas pressure in the bladders, the system achieves compliant and expressive joint movements without the complexity of traditional actuators. The gas pressure can be easily adjusted to control joint stiffness and range of motion, providing a simple yet effective control mechanism.
2Object-affected harmful factors
If sensors and complex control hardware are used to mitigate speed and power, then safety around humans is improved, but the robot becomes more complex and expensive
Solution Approach 1:
The patent uses flexible gas bladders as the primary actuation mechanism. These compliant elements inherently provide safety when interacting with humans, as they can be compressed and deformed without causing injury. The flexible nature of the gas-filled bladders eliminates the need for complex sensors and control systems to ensure safety, as the compliance is built into the actuator itself.
Solution Approach 2:
The pneumatic actuation system provides inherent safety through the compressibility of gas. When a human contacts the robot, the gas pressure can be easily relieved, allowing the joint to yield and prevent injury. This passive safety mechanism eliminates the need for active sensing and control systems, dramatically reducing complexity while maintaining high safety standards.
3Manufacturing precision
If high performance motors are used for precise movements, then task performance is improved, but the robot is not suitable for expressive actions in entertainment settings
Solution Approach 1:
The patent changes the actuation approach from precision motor control to gas pressure control. This allows for a wider range of motion profiles including slow, expressive movements and rapid, dynamic actions that are difficult to achieve with traditional motors. The gas pressure system can easily transition between different movement styles, making the robot highly adaptable for entertainment and expressive applications.
Solution Approach 2:
The pneumatic actuation system provides dynamic control capabilities that allow the robot to switch between different movement modes. The gas pressure can be rapidly adjusted to create both slow, deliberate expressive movements and fast, dynamic actions. This dynamic adaptability makes the system suitable for entertainment settings where a wide range of movement styles are required.
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 pneumatic joint actuator allows for simple, safe, and cost-effective robotic movements, enhancing safety and reducing complexity in design and maintenance, while enabling expressive and repeatable actions suitable for human-interactive applications.
Implementation Method 1
The skeletal link is pivoted about a rotation axis with the inflation of at least one of the first and second gas bladders
Implementation Method 2
The first and second gas bladders are formed of a flexible material
Data Source
Figure 1
Figure 2A
Figure 2B
AI summary
A robot that includes two or more skeletal or rigid links interconnected by a joint. The joint is pneumatically actuated and includes a pneumatic joint actuator that allows the robot's skeletal links to be moved in an expressive manner. The pneumatic actuator includes a pair of opposing air bladders encased within a housing or body of the joint. Each air bladder is positioned on an opposite side of an actuating lever arm, which is rigidly attached to one of the skeletal links and is pivotally mounted on the joint body or housing. Movement of the actuating lever arm causes the attached skeletal link to pivot. To obtain this selective movement, one of the two air bladders is filled with a gas, such as air, while the other is left un-inflated or less inflated, and this forces the lever arm and attached skeletal link to pivot about their mounting point.