Crane Load Determination via Interpolation
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Solution Overview
Problem
Current methods for determining the permissible load of a crane are inaccurate as they cannot handle arbitrary parameter values within a specified range, relying on pre-defined load tables that do not account for varying conditions.
Innovation Solution
A method that determines the permissible load as a function of the crane's discharge and main boom angle through interpolation or extrapolation using support points, allowing for precise calculations based on freely selectable parameter values, including wind speed and other influencing factors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If pre-defined load tables with predetermined parameter values are used, then the device complexity is reduced and ease of operation is improved, but the measurement precision and adaptability deteriorate because arbitrary parameter values cannot be determined
Solution Approach 1:
The patent applies parameter changes by transitioning from fixed discrete parameter values in traditional load tables to continuous variable parameters. The control system now accepts and processes arbitrary parameter values (boom length, projection, boom angle) entered by the operator, and dynamically calculates load capacity based on these variable parameters rather than relying on pre-defined tables. This resolves the contradiction by enabling both ease of operation through direct input and high measurement precision through continuous value calculation.
Solution Approach 2:
The patent implements dynamics by making the load determination system adaptive and responsive to real-time parameter inputs. Instead of static load tables, the system dynamically calculates permissible load based on the currently selected parameter values. The control system continuously updates the load capacity determination according to the operator's input, allowing the system to adapt to any combination of parameters within the operational range, thus achieving both operational flexibility and measurement accuracy.
2Ease of manufacture
If pre-defined load tables with predetermined parameter values are used, then the device complexity is reduced, but the adaptability deteriorates because arbitrary parameter values within a parameter range cannot be determined
Solution Approach 1:
The patent applies universality by designing a control system that can handle any parameter value within the operational range, making the system universally applicable rather than limited to specific predetermined values. The load determination function works for any combination of boom length, projection, and boom angle parameters, allowing a single system to serve multiple operational scenarios without requiring separate tables or configurations for each case.
Solution Approach 2:
The patent enables parameter changes by allowing the operator to input arbitrary values for critical parameters (boom length, projection, boom angle) and having the system recalculate the permissible load accordingly. This transforms the system from one that only works with fixed parameter sets to one that can adapt to any parameter combination, significantly improving versatility while maintaining manageable device complexity through automated calculation.
3Measurement precision
If interpolation or extrapolation is performed for arbitrary parameter values, then the measurement precision and adaptability are improved, but the device complexity increases due to additional calculation steps
Solution Approach 1:
The patent applies mechanics substitution by replacing complex manual interpolation and extrapolation calculations with automated electronic computation in the control system. Instead of requiring mechanical or manual methods to determine load capacity for arbitrary parameters, the control system uses software algorithms to perform the necessary mathematical operations instantly, achieving high measurement precision while keeping the physical device complexity manageable through digital processing.
Solution Approach 2:
The patent implements self-service by enabling the control system to automatically perform all necessary calculations for determining permissible load based on operator inputs. The system independently handles the interpolation and extrapolation computations without requiring external assistance or complex manual procedures, thereby improving measurement precision while the automated nature of the process prevents excessive increase in operational complexity.
Data Source
AI summary
The method involves using two or more parameters wherein the load for the value of the first parameter with different values of the second parameter is determined through calculation or interpolation or extrapolation based on the known values of the load with specific values of the first parameter. In a second step the load for the value of the second parameter based on the values of the load determined in the first stage for different values of the second parameter is implemented through calculation or through interpolation or extrapolation. The carrying load can be determined through calculation using a formula connection between the carrying load and parameters. The parameters can be inputted by hand or detected by sensors and then used as the basis for determining the carrying load. Independent claim describes crane with means for determining permissible load.