Crane Load Position Control with Vibration Damping
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Solution Overview
Problem
Crane operations are hindered by oscillatory movements due to wind and inertia, leading to imprecise positioning and unstable operating states, which can result in damage and load loss.
Innovation Solution
A method that utilizes a computing unit to evaluate the temporal sequence of detected positions for oscillatory movements and selectively controls drive devices to dampen vibration behavior, ensuring stable operation regardless of operator skill and preventing dangerous situations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If precise positioning control is implemented, then positioning accuracy is improved, but oscillations and vibrations occur due to wind and inertia during movement
Solution Approach 1:
The patent implements a feedback control system where the control device continuously receives position data from the detection system, evaluates the temporal sequence of recorded positions to detect vibrations and oscillations, and automatically adjusts the drive devices to dampen these movements. This closed-loop feedback mechanism resolves the contradiction by using real-time position information to maintain both precision and stability simultaneously.
Solution Approach 2:
The control system performs self-correction by automatically detecting its own oscillatory movements through the detection system and autonomously adjusting the drive devices to dampen vibrations without external intervention. This self-service capability allows the crane to maintain stable operation regardless of operator skill while preserving positioning accuracy.
2Stability of the object's composition
If automatic vibration damping control is implemented, then operational stability is improved, but device complexity increases due to additional detection and control systems
Solution Approach 1:
The control device performs multiple functions: it controls the drive devices for normal operation, evaluates the temporal sequence of position data to detect vibrations, and automatically adjusts drive devices to dampen oscillations. By making the control device multi-functional, the patent avoids adding separate dedicated vibration damping systems, thus improving stability while limiting the increase in overall device complexity.
Solution Approach 2:
The patent combines the vibration detection and damping control functions with the existing position control system. The detection system's position data is used both for normal positioning control and for vibration detection by evaluating the temporal sequence of positions. This merging of functions reduces the need for separate dedicated systems and minimizes the increase in device complexity.
3Reliability
If continuous position monitoring is performed, then vibration detection capability is improved, but energy consumption increases
Solution Approach 1:
The control device performs vibration detection by evaluating the temporal sequence of recorded positions, using a partial approach where it analyzes position data over time rather than requiring continuous high-frequency monitoring. This allows sufficient vibration detection capability while reducing the energy consumption compared to continuous high-rate position monitoring.
Data Source
AI summary
The invention relates to a method for controlling the position of a load element and/or a load held by a load element of a crane, wherein the crane comprises movable crane elements, movable by means of drive devices assigned to the crane elements, and a load element that can be lifted and lowered, wherein a detection system for detecting the position of the load element is provided, which comprises at least one position detection element and a computing unit, wherein the crane further comprises a control device which communicates on the one hand with the detection system for the purpose of determining the position of the load element and on the other hand with the drive devices and performs the control of the drive devices taking into account the detected position.For improved position control, the computing unit should evaluate the temporal sequence of the recorded positions to detect vibration movements of the load element, and the computing unit should be designed for the targeted control of the drive devices for the purpose of damping the vibration behavior, and should perform such targeted control of the drive devices in the event of the detection of vibration movements of the load element.