Flexural Beam Nano-Positioner Dynamic Tuning
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Solution Overview
Problem
Flexure-based nano-positioners face limitations where high-bandwidth systems have a small travel range, and large-displacement systems have low natural frequencies, making it difficult to achieve both high precision and sufficient stroke in nano-manufacturing.
Innovation Solution
A compliant apparatus with a stage comprising flexural beams and actuators that generate axial loads to shift the natural frequency of the beams, allowing trade-offs between natural frequency and stroke, utilizing the stress-stiffening effect to dynamically tune the nano-positioner for improved performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If flexure-based nano-positioners are designed for high-bandwidth operation, then natural frequency is improved, but travel range deteriorates
Solution Approach 1:
The patent applies dynamics by making the flexural beam's stiffness adjustable through active control. Actuators apply variable axial loads to the flexural beam, dynamically changing its effective stiffness and natural frequency during operation. This allows the system to adapt between high natural frequency (for bandwidth) and large displacement (for travel range) based on operational requirements, resolving the contradiction between speed and travel range.
Solution Approach 2:
The patent changes physical parameters of the flexural beam by applying axial loads that modify its effective stiffness. By varying the magnitude and direction of axial forces applied by actuators, the system can tune the natural frequency and stroke characteristics of the flexural beam, enabling trade-offs between natural frequency and travel range that would be fixed in traditional designs.
2Length of moving object
If flexure-based nano-positioners are designed for large displacement, then stroke is improved, but natural frequency deteriorates
Solution Approach 1:
The system uses active control to dynamically adjust the axial loads on flexural beams, enabling the nano-positioner to maintain appropriate natural frequencies even when operating at large displacements. The actuators compensate for the natural frequency reduction that would normally occur with increased stroke, allowing the system to achieve both large displacement and adequate bandwidth.
Solution Approach 2:
By applying variable axial loads to the flexural beams, the system can tune the effective stiffness and natural frequency parameters in real-time. This allows optimization of both stroke and natural frequency based on the specific manufacturing task requirements, rather than being constrained by fixed design parameters.
3Speed
If axial loads are applied to shift natural frequency, then dynamic characteristics are improved, but device complexity increases
Solution Approach 1:
The actuators in the system serve multiple functions: they provide the primary driving motion for the nano-positioner and simultaneously apply axial loads to tune the natural frequency of flexural beams. This multi-functionality reduces the need for separate tuning mechanisms, thereby limiting the increase in device complexity while achieving dynamic frequency adjustment.
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 real-time dynamic-tuning of nano-positioners, allowing for increased natural frequency and stroke, enhancing precision and range, and achieving better dynamic characteristics by adjusting axial forces based on required manufacturing strokes.
Implementation Method 1
The natural frequency of the flexural beam applied with an axial load may be determined based on a stress-stiffening effect of the flexural beam
Data Source
AI summary
A compliant apparatus for nano-manufacture, including a stage for supporting the objects to be nano-manufactured. The stage includes at least one flexural beam and at least one actuator coupled to the flexural beam; and the actuator is configured to generate and apply axial loads onto the flexural beam, such that a natural frequency of the flexural beam is shifted in response to the generated axial loads, so as to allow trade-offs between the natural frequency and a stroke of the stage for nano-manufacturing the objects.