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Effects of bionic non-smooth surface on reducing soil resistance to disc ploughing

Science China(Technological Sciences) 2010年第11期53卷 2960-2965页

作者： chirende benard SIMALENGA Timothy Emmanuel Key Laboratory for Bionic Engineering of Ministry of Education of China Jilin University Agricultural Research Council Institute for Agricultural Engineering(South Africa)

Past researches have shown that the non-smooth body surfaces of soil burrowing animals help to reduce soil resistance. In this research, this concept of bionic non-smooth surface was applied to disc ploughs and an experiment was conducted in an indoor soil bin to find out the effects of different bionic units on reducing soil resistance to disc ploughing. Horizontal force acting on the disc plough during soil deformation was measured using a 5 kN sensor. Convex and concave bionic units were used and the material used for making convex ones is ultra high molecular weight polyethylene (UHMWPE) which is hydrophobic. From the experiment results, higher or deeper bionic units always resulted in less soil resistance. Convex bionic units gave the highest resistance reduction reaching a maximum of 19% reduction (from 1715.36 N to 1383.65 N) compared to concave bi-onic units. Also, samples with a bionic unit density of 30% gave the highest resistance reduction compared to the other two, which were either plain or had 10% density. In conclusion, the concept of bionic non-smooth units can be applied to disc ploughs in order to reduce soil resistance.

关键词： bionics disc plough soil resistance convex units concave units non-smooth surface

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An Experimental Study on the Gait Patterns and Kinematics of Chinese Mitten Crabs

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Journal of Bionic Engineering 2013年第3期10卷 305-315页

作者： Jianqiao Li Xiaodong Zhang Meng Zou Rui Zhang benard chirende Ruiyang Shi Cangang Wei Key Laboratory of Bionic Engineering (Ministry of Education China) Jilin University Changehun 130022 P. R. China Agricultural Research Council Institute for Agricultural Engineering Private Bag X 519 Silverton 0127 Pretoria South Africa

Despite the many studies on eight-legged animals and the importance of their mechanics of terrestrial locomotion, the mechanical energy of crabs in voluntary locomotion on uneven, unpredictable terrain surfaces has received little attention thus far. In this paper, motion video images of Chinese mitten crab （Eriocheir sinensis Milne-Edwards） locomotion on five types of terrains were recorded using a high-speed three-dimensional （3D） recording video system. The typical variables of locomotion such as gait patterns, duty factor, mechanical energy of the mass center, mass-specific write of the total mechanical power of the mass center, and percentage recovery, were analyzed. Results show that the Chinese mitten crab uses random gaits instead of the alternating tetrapod gait with the increasing terrain roughness. The duty factors of the rows of the leading legs are greater for all terrains than those of the rows of the trailing legs. On smooth terrain, the duty factors of the rows of the trailing legs are greater than that on rough terrains. Kinematic measurements and calculations reveal that similar to mammals, birds, and arthropods, the Chinese mitten crab uses two fundamental gaits to save mechanical energy： the inverted pendulum gait and the bouncing gait. The bouncing gait is the main pattern of mechanical energy conservation. The low probability of injury and energy expenditure due to adaptations to various terrains induce the Chinese mitten crab to modify the mass-specific rate of the total mechanical power of the mass center. The statistical results of percentage recovery also reveal that the Chinese mitten crab has lower energy recovery efficiency over rough terrains compared with smooth terrains.

关键词： biomechanics Chinese mitten crab gait patterns kinematics

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基于圆盘犁仿生设计对犁耕阻力影响的研究

基于圆盘犁仿生设计对犁耕阻力影响的研究

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作者：车仁特（benard chirende）吉林大学

学位级别：硕士

本文包括以下三个部分:有限元模拟,仿生设计和室内试验基于蜣螂的体表形貌,采用有限元分析软件Ansys 10.0进行了圆盘犁仿生设计的三维有限元模拟。在有限元分析中,以Drucker– Prager理想弹塑性模型描述土壤变形行为,该模型仅适用于很... 详细信息

本文包括以下三个部分:有限元模拟,仿生设计和室内试验基于蜣螂的体表形貌,采用有限元分析软件Ansys 10.0进行了圆盘犁仿生设计的三维有限元模拟。在有限元分析中,以Drucker– Prager理想弹塑性模型描述土壤变形行为,该模型仅适用于很低犁耕速度条件下土壤变形的模拟。主要研究目标是发现不同仿生设计对减少犁耕阻力的影响,因此对土壤变形过程中圆盘犁的犁耕阻力进行了测量,文中的仿生设计是以具有凸包和凹坑的蜣螂触土体表作为仿生原型。犁耕阻力测量试验在吉林大学地面机械仿生技术教育部重点实验室的室内土槽进行,凸包单元的材料使用超高分子量聚乙烯(UHMWPE)。本试验目的是验证有限元分析结果,同时观察较高犁耕速度条件下,不同仿生设计对于犁耕阻力的影响。有限元分析与室内土槽试验结果一致,误差小于等于10%,满足精确性要求。有限元分析和室内试验结果均表明,仿生圆盘犁8在降低犁耕阻力方面是最有效的,并且仿生单元本身(无论是凹坑还是凸包)对于降低犁耕阻力也是至关重要的,其中凸包单元降低犁耕阻力最明显。仿生圆盘犁8的尺寸为:单元基部直径20mm,凸包高度3mm,单元密度30%。综上所述,仿生非光滑设计思想能够应用于圆盘犁以降低犁耕阻力。

关键词：仿生设计圆盘犁有限元分析室内试验犁耕阻力凸包凹坑非光滑

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