Shear Thickening Fluid Motion Control for Variable Force Restraint
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Solution Overview
Problem
Existing mechanical mechanisms often experience undesired movements, leading to issues such as noise, property damage, personal injury, and even death, due to the inability to effectively control a wide range of forces involved in these movements.
Innovation Solution
The use of a mechanical and computing system that incorporates a chamber filled with shear thickening fluid (STF), which changes viscosity in response to shear rate, allowing for dynamic control of object movement through the adjustment of STF viscosity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If traditional mechanical mechanisms are used to control object movement, then the device structure is simple, but the ability to control a wide range of forces is insufficient leading to undesired movements
Solution Approach 1:
The patent utilizes shear thickening fluid whose viscosity parameter changes dynamically in response to applied shear stress. When force is applied to the plunger, the STF transitions from a low-viscosity state allowing movement to a high-viscosity state resisting movement, enabling force control capability without complex mechanical structures
Solution Approach 2:
The patent employs a hydraulic-like system where shear thickening fluid is contained in a chamber and subjected to shear stress through plunger movement. The fluid's rheological properties enable it to function as a controllable resistance medium, allowing force control through fluid dynamics rather than mechanical linkages
2Reliability
If shear thickening fluid is used to dynamically control viscosity, then force control capability is improved, but the device complexity increases due to additional components
Solution Approach 1:
The shear thickening fluid system is self-regulating through its inherent rheological properties. When shear stress exceeds a threshold, the fluid automatically transitions to a high-viscosity state, providing self-protection and self-control without requiring external sensors, controllers, or power sources
Solution Approach 2:
The shear thickening fluid provides preemptive protection by transitioning to a high-viscosity state before damage can occur. The fluid anticipates excessive force application and automatically resists movement in advance, preventing undesired movements and potential 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
This solution enables precise control of object movement, effectively mitigating undesired movements and associated risks by dynamically adjusting the viscosity of the shear thickening fluid in response to changing shear rates.
Implementation Method 1
a chamber filled with shear thickening fluid (STF), which changes viscosity in response to shear rate
Data Source
AI summary
A head unit system for controlling motion of an object includes a secondary object sensor, shear thickening fluid (STF), and a chamber configured to contain a portion of the STF. The chamber further includes a front channel and a back channel. The head unit system further includes a piston housed at least partially radially within the piston compartment and separating the back channel and the front channel. The piston includes a first piston bypass and a second piston bypasses to control flow of the STF between opposite sides of the piston. The chamber further includes a set of fluid manipulation emitters to control the flow of the STF to cause selection of one of a variety of shear rates for the STF within the chamber.