Study of mechanical property parameters of ramie bottom stalk in harvesting period

Liu, Zhaopeng; Xie, Fangping; Wu, Mingliang; Wei, Xiao; Liu, Jianfeng

doi:10.3724/sp.j.1238.2011.00329

Cited by 4 publications

(3 citation statements)

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“…The error of the force sensor and displacement sensor of the equipment was less than ±0.5%. In order to prevent the damage of the test materials from the fixture, both ends of the samples were wrapped with gauze [26][27][28]. The tensile test consisted of longitudinal and transverse tensile tests [29].…”

Section: Tensile Test Of Jujube Barkmentioning

confidence: 99%

Effect of Micro- and Macro-Mechanical Characteristics of Jujube Bark on Jujube Girdling Quality

Ran

Zhang

et al. 2022

Agriculture

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Jujube girdling is an important method to improve the yield and quality of jujube fruit. However, girdling usually causes the tearing of jujube bark, resulting in the slow healing and even death of jujube trees. These problems directly affect the economic benefits of jujube planting. In this paper, in order to reveal the tearing mechanism of jujube bark caused by girdling, and provide the basic mechanical parameters of jujube bark for the research and development of automatic girdling equipment, the structure and mechanical characteristics of jujube bark were studied through theory and experimental methods. The results of microscopic observation showed that jujube bark is a biological composite material mainly composed of the phloem, periderm and epidermis. Furthermore, a mathematical model-based analysis of the growth stress of jujube bark showed that growth stress can be regarded as a biaxial stress state, which can promote the longitudinal tearing of jujube bark during girdling. The tensile test results of jujube bark showed that jujube bark belongs to the category of anisotropic and biologic material. Its longitudinal and transverse mechanical characteristics are significantly different. The maximum longitudinal tensile load was in the range of 105.9~293 N, the longitudinal tensile strength was 16.3 MPa and the elastic modulus was 255.6 MPa. The average transverse tensile load was only 27.9% of the longitudinal tensile load. The transverse tensile strength was 3.5 Mpa and its elastic modulus was 724.14 MPa. The transverse cutting test of jujube bark showed that the average cutting force was 118.2 N and the cutting strength was 9.8 MPa. The results of this study showed that both the growth stress and the anisotropic natural polymer of jujube bark have adverse effects on girdling. Subsequently, issues relating to the selection of appropriate girdling tools and the matters needing attention in the process of the girdling operation were proposed, so as to guide the correct application of girdling technology. In addition, some suggestions on the research and development of girdling tools in the future are put forward.

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Section: Tensile Test Of Jujube Barkmentioning

confidence: 99%

Effect of Micro- and Macro-Mechanical Characteristics of Jujube Bark on Jujube Girdling Quality

Ran

Zhang

et al. 2022

Agriculture

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“…Liu Z. P., based on the physical-mechanical properties of ramie stalks, developed a finite element numerical simulation model for ramie stalk cutting. The study analyzed the influence of various factors (such as the sliding cutting angle, blade tilt angle, blade rotation speed, and forward speed) on the maximum cutting force under different conditions [10]. Shen C. et al conducted cutting experiments on ramie stalks using a self-developed cutting test bed, studying the impact of different blade geometric parameters (blade length, blade type), cutting speed, and stalk feeding speed on cutting performance (cutting power consumption, cutting quality, and overall rating).…”

Section: Introductionmentioning

confidence: 99%

Study on the Impact of Cutting Platform Vibration on Stalk Cutting Quality in Industrial Hemp

Tian,

Huang,

Zhang

et al. 2024

Agriculture

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In response to the unclear impact of header vibration on cutting performance (stalk cutting quality and cutting energy consumption) during field operations of industrial hemp harvesters, this study utilized a vibration recorder to collect information on header vibration during the operation of industrial hemp harvesters. Through data processing, the dominant range for the resonant frequency and amplitude of the cutting platform is primarily concentrated between 5–45 Hz and 0–35 mm, respectively. Using numerical simulation techniques, a quadratic orthogonal rotation combination experiment was conducted with vibration frequency and amplitude as experimental factors and stalk cutting quality and cutting energy consumption as indicators. Regression equations were established to reveal the relationships between indicators and factors, elucidating the influence of each factor and its interactions on the indicators. Specifically, for the crack length indicator, the amplitude has a highly significant influence on the model, and there is a significant interaction effect between vibration frequency and amplitude on the model. As for the cutting energy consumption indicator, frequency and the interaction between frequency and amplitude significantly affect the model, while amplitude has an extremely significant impact on the model. Through comprehensive fuzzy evaluation, the optimal vibration parameter combination satisfying comprehensive cutting performance indicators was determined as a vibration frequency of 37.86 Hz and an amplitude of 5.34 mm. Furthermore, the reliability of the model has been further validated. This research can provide a reference for improving the field performance of industrial hemp harvesters.

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“…There are two main types of stalk crop cutters: reciprocating cutter and disc rotary cutters [21] . The latter are characterized by stable operation, small vibration, strong continuous operation ability, and high stubble quality [22,23] implying that they have notable advantages when cutting thick stalk crops [24,25] . Research on rotary disc cutter is as follows: Musa et al [26] carried out kenaf cutting experiments with sawtooth disc cutter.…”

Section: Introductionmentioning

confidence: 99%

Design and experiment of the bionic disc cutter for kenaf harvesters

Tian,

Zhang,

et al. 2023

International Journal of Agricultural and Biological Engineering

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Aiming to ease the cutting of kenaf stalks via bionics, the bionic disc cutter was designed. The upper jaw of the Batocera horsfieldi was used as a bionic prototype. Further, to explore its dynamic performance, an indoor multi-stalk cutting experimental bench was used to simulate the field operation process. A three-factor and two-level interaction orthogonal experiment was carried out; cutting speed, stalk conveying speed (machine forward speed), and blade type (ordinary disc cutter and bionic disc cutter) were used as experiment factors. The cutting pass rate and cutting specific energy consumption were selected as evaluation indexes. The range, variance, and fuzzy comprehensive evaluation analysis were carried out on the experiment results. Moreover, the main order factors affecting the bionic cutter performance were determined-blade type, conveying speed, the interaction between the cutter speed and conveying speed, and cutter speed. The optimal parameter combination scheme had a cutter speed of 1000 r/min, conveying speed of 0.4 m/s, and included bionic blades. Under this condition, the best index was the 92% cutting pass rate, with a specific energy consumption of 4.38 J/stalk. The variance analysis has shown that, with 95% confidence, the blade type has a rather significant influence on the comprehensive index. Additionally, the conveying speed also significantly influenced it, while other factors and interactions had no notable effect. The experimental comparison under the same working condition shows that the bionic blade has better cutting effect. This study provides a reference for the development of cutter and the selection of kenaf harvester operational parameters.

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Study of mechanical property parameters of ramie bottom stalk in harvesting period

Cited by 4 publications

References 0 publications

Effect of Micro- and Macro-Mechanical Characteristics of Jujube Bark on Jujube Girdling Quality

Effect of Micro- and Macro-Mechanical Characteristics of Jujube Bark on Jujube Girdling Quality

Study on the Impact of Cutting Platform Vibration on Stalk Cutting Quality in Industrial Hemp

Design and experiment of the bionic disc cutter for kenaf harvesters

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