Linear Actuator Vibration Control via Biased Current
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Solution Overview
Problem
Existing vibration control systems for vehicles fail to maximize vibration amplitude and vibrational force due to the moving element of linear actuators being displaced from its neutral position, leading to inefficient vibration cancellation.
Innovation Solution
An active vibration control apparatus that includes a linear actuator with a stator and an elastic support, where a controller applies alternating current to generate vibration and additional direct current to correct the center position of the amplitude when specific vibration conditions are met, ensuring maximum displacement and vibrational force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If alternating current is applied to the stator to generate vibration, then vibration amplitude is produced, but the moving element displaces from its neutral position reducing maximum displacement
Solution Approach 1:
The controller applies a predetermined direct current as a biased current to the stator before or during the alternating current application to pre-position the moving element at the neutral position. This preliminary positioning action ensures that the subsequent alternating current-driven vibration achieves maximum displacement amplitude by preventing the moving element from shifting away from the neutral position during vibration cycles.
2Length of moving object
If the moving element is maintained at the center of the vertical displacement range, then maximum displacement is achieved, but the system requires additional control mechanisms
Solution Approach 1:
The system changes the electrical parameter (current type) applied to the stator from pure alternating current to a combination of alternating current and predetermined direct current. By adjusting the current parameters rather than adding mechanical positioning mechanisms, the moving element is maintained at the neutral position, achieving maximum displacement without significantly increasing device complexity.
3Force
If additional direct current is applied to correct the center position, then vibration amplitude is maximized, but power consumption increases
Solution Approach 1:
The controller applies the predetermined direct current as a biased current periodically or conditionally based on vibration requirements, rather than continuously. The system monitors vibration conditions and applies the direct current only when needed to correct the center position and maximize vibration amplitude, thereby reducing overall power consumption compared to continuous direct current application.
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 system effectively cancels out engine vibrations by maximizing the amplitude and vibrational force of the linear actuator, reducing vehicle interior vibrations and noise, while minimizing power consumption by adjusting current application based on vibration frequency.
Implementation Method 1
The stator has a plurality of coils surrounding the moving element. The controller is configured to apply an alternating current to the stator to generate vibration due to relative displacement of the moving element and the stator in the axial direction.
Implementation Method 2
The elastic support supports the moving element to be reciprocally movable relative to the stator in an axial direction of the moving element due to elastic deformation of the elastic support.
Data Source
AI summary
An active vibration control apparatus includes a linear actuator and a controller. The linear actuator includes a moving element, a stator and an elastic support. The stator has a plurality of coils surrounding the moving element. The elastic support supports the moving element to be reciprocally movable relative to the stator in an axial direction of the moving element due to elastic deformation of the elastic support. The controller is configured to apply an alternating current to the stator to generate vibration due to relative displacement of the moving element and the stator in the axial direction. The controller is configured to correct a center position of an amplitude of the vibration by additionally applying a predetermined direct current as a biased current to the stator when the linear actuator satisfies a predetermined vibration condition.