Vibration Compensation in Processing Machine Axle Drives
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Solution Overview
Problem
Existing methods for damping vibrations in mechanical structures, such as those used in processing machines, often interfere with the intended displacement movement, reducing productivity and accuracy due to limitations in current active and passive vibration damping techniques.
Innovation Solution
A method that controls the axle drive of a processing machine to account for a reference displacement movement, determining a compensation movement based on the difference between actual and reference accelerations to dampen vibrations without impeding the mechanical structure's normal operation, using a control device that acts on a compensating mass through a compensating drive.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If active vibration dampers are used to dampen vibrations of mechanical structures, then vibration damping effectiveness is improved, but the desired reference displacement movement is counteracted and movement becomes more difficult
Solution Approach 1:
The control of the compensating mass is segmented into two independent components: reference displacement control and vibration compensation control. The control device separately determines a reference compensation movement based on the reference displacement movement and a vibration compensation movement based on the absolute movement, then combines them. This segmentation allows the system to maintain smooth displacement movement while effectively damping vibrations.
Solution Approach 2:
The control device acts as an intermediary that processes both the reference displacement movement and the absolute movement signals, then generates a combined control signal for the compensating mass. This intermediary function reconciles the conflicting requirements by synthesizing a control command that achieves both smooth displacement and vibration damping.
2Reliability
If passive vibration absorbers are used to dampen vibrations, then vibration damping is achieved, but the system complexity increases and adjustment flexibility is reduced
Solution Approach 1:
The patent replaces passive mechanical vibration absorbers with an active control system that uses sensors to detect absolute movement and a control device to calculate and apply compensation movements. This substitution transforms the damping approach from a fixed mechanical system to a controllable system that can adapt to different operating conditions, reducing overall system complexity while maintaining damping effectiveness.
3Reliability
If the compensating mass is controlled solely based on absolute movement, then vibration damping is achieved, but the reference displacement movement is impeded
Solution Approach 1:
The control system dynamically adjusts the compensating mass movement by continuously combining reference displacement information with absolute movement feedback. This dynamic control approach ensures that the compensating mass responds to vibrations without interfering with the intended displacement movement, maintaining both vibration damping and displacement efficiency.
Solution Approach 2:
The system uses feedback from both the reference displacement movement and the absolute movement to control the compensating mass. By incorporating feedback from both sources, the control device can distinguish between desired displacement and unwanted vibrations, applying compensation only to the vibration component while preserving the productive displacement movement.
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
Effectively damps undesirable vibrations while allowing the mechanical structure to maintain its intended displacement movement, thereby enhancing productivity and accuracy by minimizing interference from the damping process.
Implementation Method 1
dampening a vibration of the mechanical structure
Implementation Method 2
a compensating mass which damps the vibration of the mechanical structure
Data Source
AI summary
A control device of a processing machine actuates an axle drive of the processing machine commensurate with a reference displacement movement, displacing a mechanical structure of the processing machine accordingly. The control device determines an absolute movement of the mechanical structure in space and therefrom, taking into account the reference displacement movement of the mechanical structure, a compensation movement for a compensating mass damping a vibration of the mechanical structure. Arranged on the mechanical structure is a compensating drive which acts on the compensating mass. The control device actuates the compensating drive in accordance with the compensation movement, displacing the compensating mass relative to the mechanical structure and thereby damping the vibration of the mechanical structure.