Actuator Resonance Suppression via Segmented Orthogonal Supports
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Solution Overview
Problem
Existing actuators face challenges in suppressing resonance in rotary shafts, such as feed screws, leading to noise and potential breakage due to resonance coinciding with natural frequency, and existing mechanisms for supporting multiple brackets are complex and inefficient, limiting the number of revolutions and operation speed.
Innovation Solution
The implementation of a mechanism with multiple units, each having rotating members and endless strings, where the units are arranged orthogonally to the axial direction and reciprocally movable, connecting the actuator main body, moving body, and supports to suppress resonance by moving in conjunction with the moving body, effectively reducing resonance through adjustable tension and stable support.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the number of support brackets is increased to suppress resonance, then the natural frequency of the feed screw increases and resonance is suppressed, but the structure becomes complex and the operation speed decreases
Solution Approach 1:
The support brackets are divided into multiple independent units, each capable of functioning separately. This segmentation allows the system to achieve effective resonance suppression through multiple distributed support points while maintaining structural simplicity and ease of assembly, as each unit can be independently manufactured and positioned along the feed screw.
Solution Approach 2:
The support brackets are arranged in the width direction (Y-axis), which is orthogonal to the axial direction (X-axis) of the feed screw. This dimensional arrangement allows multiple support brackets to be positioned along the width of the actuator body, providing resonance suppression at different locations without requiring complex interlocking mechanisms or increasing the axial length of the structure.
2Productivity
If the number of support brackets is increased to maintain high number of revolutions, then resonance suppression improves, but the structure becomes complex requiring multiple interlocking mechanisms
Solution Approach 1:
Each support bracket is designed as an independent unit with its own simple interlocking structure. This segmentation eliminates the need for complex multi-bracket interlocking mechanisms, as each bracket can be independently attached to the actuator body and feed screw, thereby maintaining high rotational speeds without structural complexity.
Solution Approach 2:
The support brackets provide partial support functions at multiple discrete locations along the feed screw rather than requiring a continuous complex support structure. This partial action approach effectively suppresses resonance and maintains high revolution rates while keeping each individual support unit simple in design.
3Reliability
If support brackets are moved at half the slider speed using interlocking mechanism, then resonance is suppressed, but further increasing the number of brackets requires complex speed variation mechanisms
Solution Approach 1:
Multiple support brackets are merged into a common moving structure that is integrally connected to the slider. This merging allows all support brackets to move at the same speed as the slider without requiring complex individual speed control mechanisms, while still achieving effective resonance suppression through the distributed support arrangement in the width direction.
Solution Approach 2:
The support brackets serve multiple functions: they provide resonance suppression, maintain structural stability, and move integrally with the slider. This multi-functionality eliminates the need for separate speed control mechanisms for each bracket, as their primary function is achieved through their fixed positional relationship with the slider and feed screw.
4Length of moving object
If the moving stroke of the slider is increased, then the operational range improves, but the number of revolutions of the feed screw must be suppressed
Solution Approach 1:
Support brackets are arranged in the width direction (Y-axis) rather than only in the axial direction (X-axis). This dimensional arrangement provides resonance suppression at multiple transverse positions along the feed screw, allowing the system to maintain high rotational speeds even over longer axial moving strokes, thereby decoupling the relationship between stroke length and revolution rate.
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 configuration allows for increased support brackets without increasing structural complexity, enabling higher revolution rates and stable operation by effectively suppressing resonance and reducing loads on the motor, thus enhancing the actuator's efficiency and reliability.
Implementation Method 1
a pair of rotating members 622, 623 which are rotatably provided with respect to the unit main body 621 while being spaced apart from each other in the moving direction X, and an endless string 624 mounted between the rotating members 622, 623
Implementation Method 2
The unit main body of each unit is reciprocally movable in the moving direction with respect to the actuator main body. The actuator main body, the plurality of endless strings, the plurality of unit main bodies and the moving body are connected in a connection relationship described above.
Implementation Method 3
in each of the resonance suppressing mechanisms, the supports held by the unit main bodies suppress the resonance of the rotary shaft by moving in the axial direction in conjunction with the movement of the moving body while supporting the rotary shaft
Data Source
Figure 1
Figure 2A~2B
Figure 3A~3B
AI summary
M being an integer equal to or more than 2; and M speed reducers, the Nth support out of the M supports is located at the opposite side of the moving body across the (N-1)th support, N being an integer which is equal to or more than 2 and equal to or less than M, the first speed reducer out of the M speed reducers is connected to the moving body and the first support, receives a movement of the moving body in the axial direction as an input and .