Crane Drive Control Damping Natural Oscillations
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Solution Overview
Problem
Existing crane control methods cause substantial strains on the crane structure due to natural oscillations, which can lead to reduced service life and increased maintenance costs.
Innovation Solution
A method for controlling crane drives that takes into account the internal oscillation dynamics of the system, using a physical model to calculate control parameters and damp natural oscillations, thereby avoiding strain on the crane structure and drives.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional control methods are used to control crane drives, then the boom tip can be moved according to desired movement, but natural oscillations occur that exert great strain on the crane structure and drives
Solution Approach 1:
The control method calculates a control parameter that proactively compensates for natural oscillations before they occur. By using a physical model of the crane system, the controller pre-determines the necessary counter-actions to prevent oscillations, rather than reacting to them after they occur. This preliminary action eliminates the harmful strains on the crane structure while maintaining precise boom tip movement control.
2Productivity
If conventional control methods are used, then the drive can be operated, but substantial strains are imposed on the crane structure reducing service life and increasing maintenance costs
Solution Approach 1:
The control method employs a physical model of the crane system that continuously predicts the system's dynamic response. By comparing the desired boom tip movement with the predicted actual movement, the controller calculates corrective control parameters that prevent oscillations. This feedback mechanism ensures reliable operation while minimizing structural strains, thereby extending service life and reducing maintenance requirements.
3Ease of operation
If natural oscillations are allowed to occur, then the drive system is simpler to operate, but the crane structure experiences substantial strain and the boom tip does not follow desired movement exactly
Solution Approach 1:
The control method transforms the control approach by changing the control parameter calculation to account for the physical dynamics of the crane system. Instead of simple position control, the system calculates control parameters that incorporate mass, inertia, and structural characteristics. This parameter transformation enables precise boom tip positioning while avoiding the complexity of manual oscillation management.
Data Source
AI summary
The present invention comprises a method for the control of a drive of a crane, in particular of a slewing gear and/or of a luffing mechanism, wherein a desired movement of the boom tip serves as an input value on the basis of which a control parameter for the control of the drive is calculated, characterized in that the oscillation dynamics of the system comprising the drive and the crane structure are taken into account in the calculation of the control parameter to reduce natural oscillations. The present invention furthermore comprises a method for the control of a hoisting gear of a crane, wherein a desired hoisting movement of the load serves as an input value on the basis of which a control parameter for the control of the drive is calculated.