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Introduction <p>Corn headers in harvesting machines face dynamic loads and vibrations during use, which can cause resonance and structural damage. Recently, polymer nanocomposites strengthened with carbon nanotubes (CNTs) have gained attention for their light weight and improved mechanical and vibration-damping qualities compared to traditional materials.</p> Purpose <p>This study explores the free vibrational behavior of a new thermoplastic cone-disk corn header design and examines how different geometric parameters and material types affect its natural frequencies.</p> Methods <p>A three-dimensional finite element modal analysis was conducted using ANSYS Workbench to determine the first six natural frequencies and mode shapes. The analysis tested variations in cone number (5–7), cone root diameter (15–25 mm), and cone length (140–160 mm). Two materials were studied: polypropylene reinforced with carbon nanotubes (PP+CNTs) and high-density polyethylene reinforced with carbon nanotubes (HDPE+CNTs). Mesh convergence and analytical validation were done to ensure the model’s accuracy.</p> Results <p>The results show that increasing the cone number and cone length lowers the first natural frequency due to the increased mass and decreased stiffness. The cone root diameter has a nonlinear effect, with the frequency peaking around 20 mm. The first natural frequency ranged from about 202–281 Hz for PP+CNTs and 242–335 Hz for HDPE+CNTs.</p> Conclusion <p>HDPE+CNTs composites result in higher natural frequencies, about 18–20% higher than PP+CNTs. The best configuration was found to be <i>N</i> = 5, D = 20 mm, and L = 140 mm, providing better resistance to resonance during corn header operations.</p>

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Novel Design of Thermoplastic Corn Header: Free Vibrational Analysis Optimization

  • 期刊论文

  • 发表日期：

    2026年3月20日

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  • Roaa Mohammed Muneer,
  • Malik N. Hawas,
  • Mina M. Aljuboury

摘要

Introduction

Corn headers in harvesting machines face dynamic loads and vibrations during use, which can cause resonance and structural damage. Recently, polymer nanocomposites strengthened with carbon nanotubes (CNTs) have gained attention for their light weight and improved mechanical and vibration-damping qualities compared to traditional materials.

Purpose

This study explores the free vibrational behavior of a new thermoplastic cone-disk corn header design and examines how different geometric parameters and material types affect its natural frequencies.

Methods

A three-dimensional finite element modal analysis was conducted using ANSYS Workbench to determine the first six natural frequencies and mode shapes. The analysis tested variations in cone number (5–7), cone root diameter (15–25 mm), and cone length (140–160 mm). Two materials were studied: polypropylene reinforced with carbon nanotubes (PP+CNTs) and high-density polyethylene reinforced with carbon nanotubes (HDPE+CNTs). Mesh convergence and analytical validation were done to ensure the model’s accuracy.

Results

The results show that increasing the cone number and cone length lowers the first natural frequency due to the increased mass and decreased stiffness. The cone root diameter has a nonlinear effect, with the frequency peaking around 20 mm. The first natural frequency ranged from about 202–281 Hz for PP+CNTs and 242–335 Hz for HDPE+CNTs.

Conclusion

HDPE+CNTs composites result in higher natural frequencies, about 18–20% higher than PP+CNTs. The best configuration was found to be N = 5, D = 20 mm, and L = 140 mm, providing better resistance to resonance during corn header operations.