Actuator Control via Smart Material Resistance
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Solution Overview
Problem
Current actuator control technologies are limited by slow response times, which restrict their ability to perform duty cycles less than 1 ms, particularly in industries requiring high-speed operations such as materials testing and automated manufacturing, leading to inefficiencies and increased costs.
Innovation Solution
A novel actuator control system utilizing a controllable smart material that varies resistance through deformation, coupled with a controller for closed-loop control, enabling faster ramp-up and ramp-down times by employing frictional forces for precise motion control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If traditional valves are used to control actuator motion, then the system is simple and reliable, but the response time is slow (minimum 1 ms)
Solution Approach 1:
The patent replaces traditional mechanical valve-based control systems with a smart material-based control system. The smart material (e.g., piezoelectric, magnetostrictive, or shape memory material) directly converts electrical or magnetic signals into mechanical deformation, eliminating the need for mechanical valves and their associated slow response times. This substitution enables response times significantly faster than 1 ms while maintaining system reliability through direct actuation.
Solution Approach 2:
The patent utilizes smart materials that change their physical parameters (such as piezoelectric coefficients, magnetostrictive properties, or shape memory effects) in response to external stimuli. By changing the material's physical state or properties through applied fields, the system achieves rapid actuation without mechanical moving parts, thereby improving response time while avoiding the complexity of traditional valve mechanisms.
2Duration of action of moving object
If a mechanical slack adapter is added to reduce ramp-up time, then the duty cycle can be reduced, but the system loses closed-loop control and introduces specimen shock
Solution Approach 1:
The patent replaces the mechanical slack adapter with a smart material-based control system that maintains closed-loop control. The smart material's rapid response capability allows the system to achieve reduced duty cycles without needing mechanical slack adapters, thereby preserving control precision and eliminating specimen shock while still achieving the desired reduction in ramp-up time.
Solution Approach 2:
The patent maintains closed-loop control by incorporating feedback mechanisms that continuously monitor actuator position and adjust the smart material's response accordingly. This feedback system ensures that the actuator achieves rapid duty cycle reduction while maintaining control precision and preventing specimen shock, unlike open-loop mechanical slack adapter systems.
3Productivity
If traditional actuators are used in automated manufacturing, then the system is simple to operate, but manufacturing lead-times and costs increase
Solution Approach 1:
The patent replaces traditional mechanical actuator systems with smart material-based actuators that eliminate mechanical valves and complex control mechanisms. This substitution enables significantly faster response times and reduced manufacturing lead-times, directly improving productivity while maintaining ease of operation through electronic control interfaces.
Solution Approach 2:
The patent enables preliminary positioning and pre-tensioning of actuators by utilizing the smart material's rapid response capability. The actuator can be positioned and prepared in advance with precise control, then activated instantly when needed, reducing overall manufacturing lead-times without compromising operational simplicity.
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 achieves significantly improved response times, allowing for faster actuator movements and more efficient operation in high-speed applications, such as intermediate strain rate testing, with capabilities to perform duty cycles within 1 ms, reducing manufacturing costs and lead times.
Implementation Method 1
a smart material provides resistance to actuator motion
Implementation Method 2
employing frictional forces for precise motion control
Data Source
AI summary
The invention consists of a novel system and method for controlling an actuator, such as a linear actuator, used to control motion of an object, such as a tensile specimen or other component. The invention comprises applying a controllable smart material to an actuator, wherein the controllable smart material varies the resistance to the actuator motion; deforming or moving the object; sensing the objects current state; recording an associated data set comprising a plurality of parameters related to the objects state; comparing the current state of the object to the target state of the object; and altering the resistance to the actuator by deforming the smart material until the target state is reached.