Dual-Actuator Damping Control for Housing Natural Frequency Vibration
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Solution Overview
Problem
Conventional machining apparatuses face challenges in completely offsetting vibrations due to increased acceleration and reduced size constraints, leading to accuracy issues and vibration transmission, as they struggle to balance thrust and mass requirements effectively.
Innovation Solution
A damping device comprising a drive-side and damping-side actuator, with signal calculators generating drive signals to suppress natural frequency components of the housing by subtracting a displacement suppression command from a vibration suppression command, allowing for reduced or offset vibration components and one-sided displacement of the damping-side actuator.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the mass of weight 18 is reduced, then the size of the machining apparatus decreases, but the acceleration must be increased to achieve substantially the same thrust, which increases speed and displacement
Solution Approach 1:
The invention uses a damping-side actuator to generate counteracting vibration components that offset the natural frequency vibrations produced by the drive-side actuator. This allows the system to maintain effective vibration suppression without requiring excessive mass in the counterweight, thereby reducing overall apparatus size while controlling speed and displacement within acceptable ranges.
Solution Approach 2:
The invention changes the control parameters by using jerk-based signal calculation and subtracting displacement suppression commands from vibration suppression commands. This allows optimization of the damping-side actuator's motion parameters to reduce one-sided displacement and control speed while maintaining thrust effectiveness.
2Force
If the mass of weight 18 is increased, then the thrust increases, but the strength of the component supporting weight 18 needs to be increased, which increases the weight of the machining apparatus
Solution Approach 1:
The damping-side actuator serves as an active counterweight system that generates opposing forces to balance the thrust from the drive-side actuator. This allows the system to achieve effective vibration suppression with reduced mass compared to passive counterweight systems, thereby reducing the weight and strength requirements of supporting components.
3Volume of moving object
If the maximum displacement of weight 18 is reduced, then the size of the machining apparatus decreases, but the mass needs to be increased to achieve substantially the same thrust
Solution Approach 1:
The invention optimizes the motion parameters of the damping-side actuator by using jerk-based control and displacement suppression commands. This allows the system to achieve effective vibration suppression with reduced displacement amplitude, thereby reducing the size of the apparatus while maintaining appropriate mass levels.
4Force
If the acceleration is increased, then the thrust increases, but the speed and displacement naturally increase, which increases the size of the machining apparatus
Solution Approach 1:
The invention uses jerk-based signal calculation to optimize the acceleration profile of the damping-side actuator. By controlling the rate of change of acceleration (jerk), the system can generate sufficient thrust during acceleration while limiting the resulting speed and displacement excursions, thereby reducing the required size of the apparatus.
Data Source
AI summary
A damping device includes: a housing; a drive-side actuator that includes a drive-side stator and a drive-side mover and is connected to the housing; a damping-side actuator that includes a damping-side stator and a damping-side mover and is connected to the housing; a first signal calculator that generates a drive signal for the drive-side actuator based on a control command; and a second signal calculator that generates, when the drive-side actuator changes from a large to a small jerk state, a drive signal for the damping-side actuator based on a signal obtained by subtracting a displacement suppression command suppressing a displacement of the damping-side mover from a vibration suppression command reducing or offsetting, by a vibration component of the housing produced by driving of the damping-side actuator, a natural frequency component of the housing produced by driving of the drive-side actuator based on the control command.