Combine Harvester Resonance Control via Speed Shifting
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Solution Overview
Problem
Agricultural working machines, such as combine harvesters, experience unpleasant noise and vibrations due to resonance caused by optimized threshing drum speed settings matching the natural frequency of components, leading to disrupted operation and potential clogging of intake channels.
Innovation Solution
A sensor system monitors noise and vibration development, detecting critical speed ranges that induce resonance and adjusts the driver assistance system to set speeds outside the natural frequency range, preventing or reducing vibrations and noise by adjusting the rotational speed of working elements like the threshing mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the optimized rotational speed is set to match the natural frequency for maximum processing efficiency, then productivity is improved, but noise and vibration increase due to resonance
Solution Approach 1:
The patent changes the rotational speed parameter from the optimized value (matching natural frequency) to a shifted value (outside the critical range). The driver assistance system dynamically adjusts the rotational speed parameter to operate outside the natural frequency range, thereby eliminating resonance while maintaining near-optimal processing efficiency.
2Object-affected harmful factors
If the rotational speed is adjusted outside the natural frequency range to reduce noise and vibration, then harmful factors are reduced, but productivity decreases
Solution Approach 1:
The patent implements a feedback mechanism where sensors continuously monitor noise and vibration levels, and the driver assistance system uses this feedback to dynamically adjust the rotational speed. This closed-loop control ensures that the system operates outside critical frequency ranges while maintaining optimal productivity through real-time parameter optimization.
3Object-affected harmful factors
If sensors and driver assistance systems are added to monitor and adjust rotational speed, then noise and vibration are controlled, but device complexity increases
Solution Approach 1:
The driver assistance system performs multiple functions: it monitors operating parameters, determines optimized rotational speeds, detects critical frequency ranges, and adjusts speeds to avoid resonance. By consolidating these diverse functions into a single multi-functional system, the patent reduces overall device complexity while achieving effective noise and vibration control.
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 solution effectively reduces noise and vibrations, maintaining operational efficiency by ensuring the threshing mechanism operates outside the natural frequency range, thereby preventing resonance-related disruptions and ensuring continuous crop processing.
Implementation Method 1
sensors (12) for monitoring noise and/or vibration development in the agricultural machine
Implementation Method 2
This vibration corresponds to, or at least very closely approximates, the natural frequency of a component of the combine harvester. This causes the corresponding component to vibrate more intensely, a phenomenon known as resonance.
Implementation Method 3
The driver assistance system now initiates a change in the previously determined optimal rotational speed so that it lies outside the natural frequency range. This prevents, or at least largely prevents, a resonance-induced increase in noise and/or vibration
Data Source
Figure 1
AI summary
The invention relates to an agricultural machine (1), in particular a combine harvester, with several working elements (2-7) for performing or supporting agricultural work, and with a driver assistance system (10) for setting an optimized rotational speed of at least one of the working elements (2-7) based on detected operating parameters of the agricultural machine (1). It is proposed that a sensor (12) be provided for monitoring noise and/or vibration development in the agricultural machine (1) during its operation, configured to detect a critical range of a set optimized rotational speed, and cause the driver assistance system (10) to change this speed so that it lies outside a defined threshold range of a natural frequency of the agricultural machine (1).