Multi-Arm Smart Material Actuator for 3D Motion
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Solution Overview
Problem
Conventional smart material actuators with one or two actuating arms are limited in applications requiring motion in multiple planes or orthogonal directions, and they often fail at high frequencies due to overextension, lacking the flexibility and efficiency needed for advanced uses such as audio speakers.
Innovation Solution
A multi-arm actuator system driven by a smart material device, featuring more than two actuating arms that move in independent planes, with a compensator and mechanical webs to amplify motion and include dampeners for high-speed operation, allowing for adjustable arm angles and efficient operation across various applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional smart material actuators with one or two actuating arms are used, then the structure is simple, but the actuator is limited to single plane motion and cannot operate in multiple planes or orthogonal directions
Solution Approach 1:
The patent transitions from one-dimensional (single plane) motion to three-dimensional motion by adding multiple actuating arms that operate in independent planes. The mechanical web structure enables arms to move in orthogonal directions simultaneously, achieving 3D motion capability while maintaining a relatively compact actuator body.
Solution Approach 2:
The actuator is segmented into multiple independent actuating arms (at least three), each capable of independent motion in different planes. This segmentation allows the actuator to perform complex multi-plane motions that cannot be achieved with a single arm, while each arm maintains a relatively simple structure.
2Productivity
If smart material actuators operate at very high frequencies, then productivity increases, but the actuating arms tend to overextend and the actuator fails
Solution Approach 1:
Dampeners are integrated into the actuator structure to provide beforehand cushioning against overextension. These dampeners absorb excess energy and prevent the actuating arms from exceeding their safe range of motion during high-frequency operation, thereby protecting the actuator from failure while enabling high-speed operation.
Solution Approach 2:
The patent reduces the weight of actuating arms to change the inertial parameters of the system. Lighter arms have lower momentum and are less prone to overextension during rapid acceleration and deceleration cycles, enabling reliable high-frequency operation. This parameter change allows the actuator to operate at resonant frequencies without failing.
3Adaptability or versatility
If actuating arms are designed for specific angles, then manufacturing efficiency increases, but the actuator lacks flexibility for different applications
Solution Approach 1:
The actuator employs adjustable arm angles that can be configured for different applications. The mechanical web structure allows arms to be positioned at various angles while maintaining structural integrity. This dynamic configurability enables the same actuator design to serve multiple applications with different spatial requirements without requiring completely different manufacturing processes.
Solution Approach 2:
The actuator design achieves universality by incorporating adjustable arm angles and modular mechanical web structures that can be configured for different applications. The same basic actuator platform can be adapted to various angle requirements, making it a multi-functional device that reduces the need for multiple specialized actuator designs.
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 efficient operation in multiple planes, high-frequency applications, and flexible use in diverse applications like audio speakers, energy capture, and sensors, with improved durability and efficiency by reducing arm weight and using dampeners to prevent overextension.
Implementation Method 1
The piezo or other smart material device will change shape upon application of a suitable electric potential, thereby providing the motive force for the actuator. More specifically, upon application of a suitable electrical potential, the smart material device will expand
Implementation Method 2
The mechanical webs have a first compliant member attached to the compensator and a second compliant member attached to said movable supporting member. The expansion urges the movable supporting member away from the first mounting surface and causes said compliant members to flex. The flexing of the compliant members, in turn, urge the actuating arms to move such that motion of the second actuating arm end is across a distance greater than the expansion of said smart material device
Implementation Method 3
Certain embodiments of the actuator of the present invention, however, are designed to overcome such limitations both by reducing the weight of the actuating arms and by providing dampeners adapted to prevent such overextensions without hindering high speed operation
Data Source
AI summary
A smart material actuator having more than two actuating arms, more than two mechanical webs, and being driven by a piezo or other smart material device within an enclosed compensator, and which may be adapted for use as an actuator, an energy capture device, or a sensor. In certain embodiments, the smart material actuator can also operate as the driver for an audio speaker.