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Damping behavior of olive trees under trunk shaking
Mohamed Ghonimy1, Abdulaziz Alharbi2, Mohamed M Ibrahim3
1Department of Agricultural and Biosystems Engineering, College of Agriculture and Food, Qassim University, Buraydah, 51452, Saudi Arabia.
Scientific Reports
|April 4, 2025
Summary
Optimizing shaker attachment height in olive trees improves elastic response and energy efficiency during mechanical harvesting. Lower attachment points and larger trunk diameters reduce transmitted acceleration, minimizing potential damage.
Area of Science:
- Agricultural Engineering
- Biomechanical Engineering
- Horticulture
Background:
- Mechanical harvesting of olive trees requires understanding tree dynamics under vibration.
- Damping, acceleration, and power transmission are critical parameters for efficient and safe harvesting.
Purpose of the Study:
- To investigate the damping behavior of olive trees subjected to trunk shaking.
- To analyze the influence of shaker attachment height on acceleration, power, and damping dynamics.
- To provide insights for optimizing mechanical harvesting strategies.
Main Methods:
- Olive trees were subjected to trunk shaking at five different attachment heights (0.4-0.8 m).
- Transmitted acceleration, logarithmic decrement, and power (shaking, damping, elastic) were measured in the tree and soil.
- Analysis focused on the relationship between attachment height, trunk diameter, and dynamic responses.
Main Results:
- Peak elastic power (8.8 kW) was observed at 0.8 m attachment height, indicating maximum elastic capacity.
- Higher attachment heights and larger trunk diameters resulted in increased transmitted acceleration (up to 30.7 m·s⁻²).
- Logarithmic decrement decreased with distance from the shaker, showing greater damping in the trunk than branches.
Conclusions:
- Optimizing attachment height is crucial for enhancing energy efficiency and minimizing tree damage during mechanical harvesting.
- Understanding the interplay between elastic capacity, inertia, acceleration transmission, and damping is key for effective harvesting.
- Findings support informed adjustments in mechanical harvesting techniques for improved operational outcomes.
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