Harvester Separation Loss Calculation Using Crop Flow Modeling
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Solution Overview
Problem
Existing methods for determining losses in harvesting machines, such as combine harvesters, lack precision and accuracy in quantifying grain loss during the separation process, particularly due to variations in mechanical conditions and crop flow dynamics within the separating device.
Innovation Solution
A method involving the determination of a crop flow line within the separating element, use of a separation function with coefficients based on measurements, and calculation of loss by integrating the separation function to account for three-dimensional crop movement and mechanical forces, allowing for precise determination of grain loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If characteristic curves are used to determine losses, then the method is simple to implement, but the accuracy of loss determination is insufficient
Solution Approach 1:
The patent replaces the conventional characteristic curve method with a computational approach using a loss calculation unit that integrates a separation function. This function models the three-dimensional crop flow dynamics and mechanical forces within the separating device, substituting empirical curves with a physics-based mathematical model that accounts for crop mass flow rate, separation efficiency, and mechanical parameters to accurately determine grain loss.
Solution Approach 2:
The patent transforms the loss determination from a static characteristic curve approach to a dynamic parameter-based calculation. The separation function incorporates multiple variables including crop flow rate, separation zone geometry, mechanical forces, and crop properties, allowing the system to adapt to varying operating conditions and provide accurate loss determination across different harvesting scenarios.
2Measurement precision
If three-dimensional crop flow and mechanical forces are considered, then loss determination accuracy improves, but calculation complexity increases
Solution Approach 1:
The patent segments the complex three-dimensional separation process into manageable computational components. The separating device is divided into distinct separation zones, and the crop flow is modeled through sequential sections along the flow line. This segmentation allows the complex integration to be performed in discrete steps, reducing computational complexity while maintaining accuracy in capturing three-dimensional flow dynamics and mechanical forces.
Solution Approach 2:
The patent introduces a separation function as an intermediary mathematical model that bridges the complex physical phenomena and the final loss calculation. This function serves as a mediator that incorporates three-dimensional crop flow characteristics and mechanical forces through defined parameters, transforming the complex physical problem into a solvable mathematical integration that balances accuracy with computational feasibility.
Data Source
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AI summary
The present invention relates to a method (100) for determining a loss from a harvesting machine (200), wherein the harvesting machine (200) comprises a separating element (225), the method comprising: determining a crop flow line (300) in the separating element (225), wherein crop can be separated section by section along the crop flow line (300), providing a separation function (600) with coefficients based on the crop flow line (300), acquiring measured values (M) in the separating element (225), determining the coefficients of the separation function (600) at least partially based on the measured values (M), and determining the loss by means of the separation function (600). The present invention further relates to a harvesting machine (200).