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Experimental Study of Reciprocating Friction between Rape Stalk and Bionic Nonsmooth Surface Units
Zheng Ma1, Yaoming Li1, Lizhang Xu1
1Key Laboratory of Modern Agricultural Equipment and Technology, Ministry of Education and Jiangsu Province, Jiangsu University, Zhenjiang, Jiangsu 212013, China.
Applied Bionics and Biomechanics
|April 2, 2016
Summary
Bionic nonsmooth surfaces on combine harvester cleaning screens reduce rape material adhesion. Convex units are most effective, improving harvest efficiency and minimizing losses in rape oilseed production.
Area of Science:
- Agricultural Engineering
- Tribology
- Biomimetics
Background:
- Rape oilseed harvesting in China faces challenges due to low mechanization.
- Rape material adhesion to combine harvester cleaning screens causes significant yield losses.
- Bionic nonsmooth surfaces show potential for reducing material adhesion, but mechanisms are unclear.
Purpose of the Study:
- To investigate the friction mechanisms between rape stalks and bionic nonsmooth metal surfaces.
- To analyze the effectiveness of different bionic surface designs in reducing material adhesion.
Main Methods:
- Utilized the short-time Fourier transform (STFT) to analyze friction signals.
- Defined and measured stick-lag distance for stable reciprocating friction analysis.
- Examined friction dynamics on smooth, concave, and convex metal surfaces.
Main Results:
- Rape stalk friction on metal surfaces exhibits stick-slip behavior.
- Bionic nonsmooth surfaces (concave and convex) reduced friction force as reciprocating frequency increased.
- Convex surfaces demonstrated a greater increase in stick-lag distance with frequency, indicating more efficient friction reduction.
Conclusions:
- Bionic nonsmooth cleaning screens, particularly those with convex units, effectively reduce rape material adhesion.
- These findings suggest improved combine harvester cleaning screen designs for enhanced rape oilseed harvesting efficiency.