Crane Hook Positioning Using Stiffness Data
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Solution Overview
Problem
Existing crane control methods inaccurately determine the position of the load lifting device due to the assumption of a rigid crane structure, which neglects deformations caused by applied forces, leading to safety concerns and inaccuracies, especially in tandem operations.
Innovation Solution
A method that uses measuring devices to provide data characterizing the stiffness of the crane, including bending, tensile, and torsional stiffness, to calculate the precise position of the load lifting device, considering deformations and modeling the crane as elastic elements, allowing for a more realistic and accurate position determination without requiring additional sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If geometric relations of the crane body are used to calculate hook position, then the calculation is simple, but the position determination is inaccurate due to crane deformation under load
Solution Approach 1:
The patent changes the calculation parameters from simple geometric relations to a comprehensive model that includes stiffness characteristics (bending, tensile, torsional) of crane components. This allows the system to account for deformations under load while maintaining calculation feasibility through structured mathematical relationships.
Solution Approach 2:
The patent transitions from a static rigid body model to a dynamic elastic model that considers how crane components deform under varying loads. The stiffness characteristics allow the calculation to adapt to different loading conditions, improving position accuracy without requiring complex real-time sensing.
2Reliability
If a rigid crane structure is assumed, then the calculation model is simple, but safety is compromised due to ignoring deformations under extreme loads
Solution Approach 1:
The patent introduces stiffness parameters (bending stiffness, tensile stiffness, torsional stiffness) to characterize the elastic behavior of crane components. These parameters enable the calculation model to reflect real-world deformations under load, improving safety assessments while maintaining a structured approach that doesn't require overly complex modeling.
3Measurement precision
If additional sensors are installed to measure crane deformation, then position accuracy improves, but device complexity and cost increase
Solution Approach 1:
The patent makes the crane system self-measuring by utilizing its existing structural characteristics (stiffness properties) to determine position. The calculation model inherently accounts for deformations through stiffness parameters, eliminating the need for additional deformation sensors while maintaining high position accuracy.
Solution Approach 2:
The patent replaces physical deformation measurement (which would require mechanical sensors) with a calculation-based approach using stiffness characteristics. This substitution eliminates the need for additional mechanical sensing systems while achieving the same measurement objective through mathematical modeling.
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
This approach provides a more precise determination of the load lifting device's position, enhancing safety and accuracy in crane operations, particularly in tandem systems and with lifting force limiters, by accounting for crane deformations and using existing sensors, thus improving the reliability of crane control.
Implementation Method 1
a calculation of the position of the load lifting device is effected on the basis of the one or more measured values of at least one measuring device and one or more data characterizing the stiffness of the crane
Implementation Method 2
The same however cause a considerable deformation of the geometric shape of the crane, which then leads to inaccuracies in the calculation of the position
Data Source
AI summary
The present disclosure relates to a method for the control and/or the data acquisition of a crane, wherein at least one measuring device at the crane supplies one or more measured values for determining the position of at least one load lifting device, in particular a crane hook, wherein a calculation of the position of the load lifting device is effected on the basis of the one or more measured values of at least one measuring device and one or more data characterizing the stiffness of the crane. The present disclosure also relates to a crane controller and a crane for carrying out the method according to the present disclosure.