Resonating Steering Structure for Low-Reynolds Microrobot Propulsion
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Solution Overview
Problem
The challenge of propelling a microrobot in a viscous environment at low Reynolds number, such as the brain, is hindered by the absence of inertia and high drag forces, requiring a propulsion mechanism that minimizes physiological damage.
Innovation Solution
A micro-robot equipped with a resonating structure comprising weight-resonators that change propulsion direction through activation and deactivation at specific frequencies, utilizing vibrations generated by the micro-motor to control steering without additional energy sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a microrobot is propelled in a viscous environment at low Reynolds number, then propulsion is achieved, but high drag forces and absence of inertia make control difficult and require additional energy sources that increase device complexity
Solution Approach 1:
The microrobot utilizes vibrational movements generated by its actuator to propel itself through the viscous environment. The body is configured to vibrate, creating motion without requiring traditional mechanical propulsion systems. This vibration-based approach enables movement at low Reynolds numbers while avoiding complex steering mechanisms.
Solution Approach 2:
The resonating structure uses the same actuator that generates propulsion vibrations to also control steering direction. By adjusting the activation frequency of weight-resonators already present in the propulsion system, the microrobot achieves self-steering without additional energy sources or separate steering components, thus reducing device complexity.
2Ease of operation
If additional energy sources or devices are added to the microrobot for steering control, then directional control is improved, but the risk of damaging the physiological environment increases
Solution Approach 1:
The actuator serves dual functions: generating propulsion vibrations and controlling steering direction through frequency modulation of weight-resonators. This multi-functionality eliminates the need for additional energy sources or steering devices, thereby reducing the risk of physiological damage while maintaining ease of directional control.
Solution Approach 2:
Steering control is achieved by changing the activation frequency parameter of the weight-resonators rather than adding physical steering components. The actuator modulates the frequency of vibrations to activate specific weight-resonators, changing the propulsion direction without introducing additional devices that could cause harm to the physiological environment.
3Measurement precision
If weight-resonators with different proper activation resonance frequencies are used, then steering precision is improved, but the range of frequencies required increases actuator complexity
Solution Approach 1:
The system uses the natural resonance frequencies of the weight-resonators as feedback mechanisms. Each weight-resonator has a specific proper activation resonance frequency that provides stable and precise steering control. The actuator monitors and adjusts vibrations to match these resonant frequencies, achieving precise steering without requiring complex frequency modulation across a broad spectrum.
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 allows efficient propulsion and directional control of the microrobot within viscous environments by harnessing its own energy, reducing the risk of environmental damage.
Implementation Method 1
a distribution of weight-resonators, each weight-resonator being configured to be activated by a proper activation resonance frequency, the respective proper activation resonance frequencies of the weight-resonators being different from each other
Implementation Method 2
the actuator is configured to generate vibrations in a range of frequencies including the proper activation resonance frequency of each weight-resonator
Data Source
Figure 1a~1b
Figure 2a~2b
Figure 3a~3b
AI summary
Micro-robot (100) comprising a body (101) configured to vibrate, and an actuator (12) configured to generate vibrations causing the micro-robot to move. It comprises a steering system (10) which comprises a resonating structure (16) configured to be secured to the micro-robot and comprising: - a steering structure (18) to control the propulsion direction, - weight-resonators (20) being configured to be activated by a proper activation resonance frequency. The actuator is configured to generate vibrations in a range of frequencies including the proper activation resonance frequency of each weight-resonator. The resonating structure displays at least two states: - one activated steering state, in which at least one of the weight-resonators is activated at the proper activation resonance frequency to change the propulsion direction, - a non-activated steering state, in which none of the weight-resonators is activated at its proper activation resonance frequency so as to maintain the propulsion direction.