Passive Torque Balancing in High-Frequency Oscillating Drivetrains
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Solution Overview
Problem
Current micro-robotic flight devices, such as the HMF and MFI, face challenges in controlling aerodynamic forces for stable flight, as they rely on deterministic kinematic relationships between actuation strokes and wing-stroke angles, which are inadequate for balancing aerodynamic drag torques and require complex control systems.
Innovation Solution
The PARITy drivetrain introduces a passive torque-balancing mechanism with an under-actuated drivetrain that uses a single actuator to balance aerodynamic drag torques between two wings, allowing wing stroke angles to decouple and dynamically adjust to achieve desired force relationships, reducing the need for mass- and power-intensive control systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If deterministic kinematic relationships between actuation strokes and wing-stroke angles are enforced, then control precision is improved, but device complexity and power consumption increase
Solution Approach 1:
The drivetrain uses passive torque balancing through mechanical symmetry and under-actuation, allowing the system to self-regulate wing stroke angles without active control inputs. The single actuator drives both wings through a symmetric linkage mechanism that automatically balances aerodynamic torques, eliminating the need for complex control systems while maintaining precise wing motion control
2Measurement precision
If deterministic kinematic relationships between actuation strokes and wing-stroke angles are enforced, then control precision is improved, but power consumption increases
Solution Approach 1:
The system uses passive torque balancing through mechanical symmetry and under-actuation, allowing the system to self-regulate wing stroke angles without active control inputs. The single actuator drives both wings through a symmetric linkage mechanism that automatically balances aerodynamic torques, eliminating the need for complex control systems while maintaining precise wing motion control
Solution Approach 2:
The drivetrain merges the control of both wings into a single under-actuated system with one actuator. The symmetric linkage mechanism combines the drive strokes to simultaneously control both wings, reducing the number of actuators and associated power consumption while maintaining coordinated wing motion for stable flight
3Device complexity
If a single actuator is used to drive both wings, then device complexity is reduced, but torque balancing capability deteriorates
Solution Approach 1:
The drivetrain employs asymmetric linkage configurations that compensate for the single actuator limitation. By carefully designing the linkage geometry and pivot points, the system creates asymmetric mechanical advantage ratios that passively balance the aerodynamic torques on each wing, achieving torque equilibrium despite the simplified single-actuator architecture
Solution Approach 2:
The system changes the mechanical parameters of the linkage mechanism, such as link lengths, pivot positions, and transmission ratios, to optimize torque distribution. By adjusting these parameters, the drivetrain achieves passive torque balancing that compensates for the reduced actuation capability of a single actuator
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 PARITy drivetrain effectively balances aerodynamic drag torques between wings, reducing peak and instantaneous torque imbalances by up to 133 and 58 times compared to existing designs, enabling stable and efficient flight with simpler control strategies.
Implementation Method 1
The drivetrain exhibits Passive Aeromechanical Regulation of Imbalanced Torques (PARITy) and will be referred to as the PARITy drivetrain, or simply the PARITy, herein. The PARITy drivetrain delivers power from a single actuator to two wings in a manner that passively balances the aerodynamic drag torques created at each flapping wing.
Implementation Method 2
a fulcrum joint that is joined both to the input platform and to the proximate rigid link
Data Source
AI summary
A passively torque-balanced device includes (a) a frame; (b) a drivetrain including a drive actuator mounted to the frame and configured for reciprocating displacement, an input platform configured for displacement by the drive actuator, a plurality of rigid links, including a proximate link and remote links, wherein the rigid links are collectively mounted to the frame, and a plurality of joints joining the rigid links and providing a plurality of non-fully actuated degrees of freedom for displacement of the rigid links, the plurality of joints including a fulcrum joint that is joined both to the input platform and to the proximate rigid link; and (c) at least two end effectors respectively coupled with the remote links and configured for displacement without full actuation.