Shear-Thickening Fluid Rotary Coupler for Adaptive Torque Transfer
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Solution Overview
Problem
Mechanical mechanisms often experience undesired movements leading to issues such as noise, property damage, and safety hazards due to uncontrolled forces, necessitating a system to manage a wide range of forces effectively.
Innovation Solution
A mechanical and computing system utilizing a chamber filled with shear thickening fluid (STF) that adjusts viscosity based on shear rate, employing sensors and emitters to control piston movement and object trajectory through dynamic adjustment of fluid viscosity, allowing for precise control of forces and movements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional mechanical coupling mechanisms are used to transmit rotary power, then the structure is simple and easy to manufacture, but the system cannot dynamically control or regulate the transmission of power and movement
Solution Approach 1:
The patent changes the physical parameter of the fluid (viscosity) in response to shear rate variations. The shear thickening fluid transitions from a low-viscosity state during normal operation to a high-viscosity state during excessive force events, dynamically controlling power transmission without complex mechanical components.
Solution Approach 2:
The patent uses a fluid-based coupling mechanism where shear thickening fluid fills the space between the drive turbine and load turbine. This hydraulic approach replaces traditional mechanical couplings, allowing dynamic control of power transmission through fluid viscosity changes rather than mechanical engagement/disengagement.
2Force
If mechanical mechanisms are designed to handle wide range of forces, then the system can manage both desired and undesired movements, but the structure becomes more complex and harder to manufacture
Solution Approach 1:
The shear thickening fluid's viscosity parameter changes in response to applied shear stress. During normal operation with desired forces, the fluid maintains low viscosity for smooth power transmission. When undesired excessive forces occur, the viscosity increases dramatically, automatically regulating the force transmission without complex mechanical force-limiting mechanisms.
Solution Approach 2:
The shear thickening fluid provides self-regulating force control based on the applied load. The fluid automatically transitions between viscosity states in response to shear rate changes, eliminating the need for external sensors, actuators, or control systems to manage force ranges.
3Reliability
If rigid mechanical linkages are used to control movement, then the control precision is high, but the system cannot adapt to varying operational conditions and may cause damage under unexpected forces
Solution Approach 1:
The shear thickening fluid acts as a pre-positioned protective medium between the drive and load turbines. During normal operation, it allows smooth power transmission. When excessive forces or unexpected events occur, the fluid's viscosity increases immediately, cushioning the impact and preventing damage to connected mechanical components.
Solution Approach 2:
The patent converts the harmful effect of excessive shear forces into a beneficial protective mechanism. The same shear forces that could damage the system trigger the viscosity increase in the shear thickening fluid, which then protects the mechanical components from damage.
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 system effectively controls and regulates the movement of mechanical objects by dynamically adjusting the viscosity of the shear thickening fluid, thereby managing forces and preventing undesired movements, enhancing safety and reducing damage.
Implementation Method 1
The STF is configured to have a decreasing viscosity in response to a first range of shear rates and an increasing viscosity in response to a second range of shear rates
Data Source
AI summary
A power coupler for transferring rotary power from a rotary power device to a load device includes a shear thickening fluid (STF) and a chamber that contains the STF. The power coupler further includes a drive shaft housed radially within a drive side section of the chamber and protruding outward from an end of the chamber for coupling to the rotary power device. The power coupler further includes a load shaft housed radially within a load side section of the chamber and protruding outward from another end of the chamber for coupling to the load device. The power coupler further includes a drive turbine housed radially within the drive side section and coupled to the drive shaft. The power coupler further includes a load turbine housed radially within the load side section at a fixed operational distance from the drive turbine and coupled to the load shaft.