Experimental Investigation into Soil-Cutting Performance of the Claws of Mole Rat (Scaptochirus moschatus)

Ji, Wenfeng; Chen, Donghui; Hu, Jia; Jin, Tao

doi:10.1016/s1672-6529(09)60231-6

Cited by 31 publications

(24 citation statements)

References 15 publications

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“…Rape stalks with high water content (72% ± 4%) were used in this study as upper specimens, because they are the main threshing materials that adhere to cleaning screens in combine harvesters. A reciprocating friction form simulated the actual movement of cleaning screens, and surface units of the lower specimen were consistent with those used in the field experiment [ 4 , 5 ]. All tests were repeated three times.…”

Section: Methodsmentioning

confidence: 99%

“…In recent years, bionic research continuously provides efficient methods or ideas for solving engineering problems [ 4 , 5 ]. Rape material adherence to cleaning screens can be classified as an adhesion and friction problem between damp materials and moving metal parts [ 3 ].…”

Section: Introductionmentioning

confidence: 99%

“…One of the combine harvesters was equipped with a common smooth surface cleaning screen, while the other two combine harvesters had bionic nonsmooth surface cleaning screens with concave or convex units, respectively. About 70% of the common smooth surface cleaning screen area was clogged every 5 acres of continuous rape harvest resulting in high cleaning losses, while the bionic nonsmooth surface cleaning screens with concave and convex units could continuously harvest 12 and 23 acres of rape, respectively [ 4 , 5 ]. The results showed that bionic nonsmooth surface cleaning screens could restrain the adhesion of rape materials, but the underlying mechanism remains unclear.…”

Section: Introductionmentioning

confidence: 99%

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Experimental Study of Reciprocating Friction between Rape Stalk and Bionic Nonsmooth Surface Units

2015

Applied Bionics and Biomechanics

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Background. China is the largest producer of rape oilseed in the world; however, the mechanization level of rape harvest is relatively low, because rape materials easily adhere to the cleaning screens of combine harvesters, resulting in significant cleaning losses. Previous studies have shown that bionic nonsmooth surface cleaning screens restrain the adhesion of rape materials, but the underlying mechanisms remain unclear. Objective. The reciprocating friction between rape stalk and bionic nonsmooth metal surface was examined. Methods. The short-time Fourier transform method was used to discriminate the stable phase of friction signals and the stick-lag distance was defined to analyze the stable reciprocating friction in a phase diagram. Results. The reciprocating friction between rape stalk and metal surface is a typical stick-slip friction, and the bionic nonsmooth metal surfaces with concave or convex units reduced friction force with increasing reciprocating frequency. The results also showed that the stick-lag distance of convex surface increased with reciprocating frequency, which indicated that convex surface reduces friction force more efficiently. Conclusions. We suggest that bionic nonsmooth surface cleaning screens, especially with convex units, restrain the adhesion of rape materials more efficiently compared to the smooth surface cleaning screens.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Experimental Study of Reciprocating Friction between Rape Stalk and Bionic Nonsmooth Surface Units

2015

Applied Bionics and Biomechanics

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“…Soil-engaging tool designs based on geometrical structures of soil-burrowing animals were found to have the distinguished performance of low forward resistance against soil [ 18 ], and it was proved that the bionic designs imitating the geometrical features of the soil insect's digging limbs had remarkable effects on the performance of soil-engaging tools [ 19 – 22 ]. Hence, some characteristics of soil insects that have highly efficient soil-digging abilities have been carried out by researchers and have shown to successfully improve the working efficiency of soil-engaging components [ 23 , 24 ].…”

Section: Introductionmentioning

confidence: 99%

Innovative Design and Performance Evaluation of Bionic Imprinting Toothed Wheel

Zhang

Wang

Jin

et al. 2018

Applied Bionics and Biomechanics

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A highly efficient soil-burrowing dung beetle possesses an intricate outer contour curve on its foreleg end-tooth. This study was carried out based on evidence that this special outer contour curve has the potential of reducing soil penetration resistance and could enhance soil-burrowing efficiency. A toothed wheel is a typical agricultural implement for soil imprinting, to increase its working efficiency; the approach of the bionic geometrical structure was utilized to optimize the innovative shape of imprinting toothed wheel. Characteristics in the dung beetle's foreleg end-tooth were extracted and studied by the edge detection technique. Then, this special outer contour curve was modeled by a nine-order polynomial function and used for the innovative design of imprinting the tooth's cutting edge. Both the conventional and bionic teeth were manufactured, and traction tests in a soil bin were conducted. Taking required draft force and volume of imprinted microbasin as the evaluating indexes, operating efficiency and quality of different toothed wheels were compared and investigated. Results indicate that compared with the conventional toothed wheel, a bionic toothed wheel possesses a better forward resistance reduction property against soil and, meanwhile, can enhance the quality of soil imprinting by increasing the volume of the created micro-basin.

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“…Meanwhile, the bionic design is also utilized for agricultural industries, for example, P. Ball [10] revealed the drag reduction mechanism in fluid medium. The excavating functions of mole claws offered good clues for designing anti-resistance force soil cutting instruments and excavation instruments [11]. Bo Li [12] analyzed the excellent property of bear claws for the future design of subsoiling tools, and found the best performance of the claw was at the rake angle of 30 • with consideration into draft force and soil disturbance.Of all the biological characteristics, the animal teeth have the best comparability with the penetrating process, regardless of the profiles and occluding modes [13].…”

mentioning

confidence: 99%

Effects of Bionic Curves on Penetration Force under Difference Soils

Wang

Zhuang

et al. 2020

Applied Sciences

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Soil penetration is the most important process during soil tilling. To optimize the soil penetration process, six specimens were designed and fabricated based on the badger teeth outlines. Both experimental investigation and numerical analysis were conducted with three types of soil. Results showed the specimen C, B, and D got the lowest penetration force and reduced the force by 26.15%, 22.68%, and 25.86% compared with that of specimen A under soil 1, soil 2, and soil 3, respectively. Depth-force curve analysis showed that the bionic specimens can slow down the force increase rate by reducing the coefficient of the force-depth curve equations. The bionic specimens obtained a lower increase of internal friction angle and cohesion after penetration, indicating the soil strength after penetration was lower. Furthermore, the rise in soil surface was observed after the penetration, and the penetration with the bionic specimens got a higher rise. Simulation analysis showed that the mechanism for the force reduction was because the force direction was changed, which brought a better flowability and less strength for the soil. It concludes that the badger teeth outlines reduce the penetration force by changing the force directions and optimizing the soil properties. Based on research results, the optimal bionic curve for penetration in different types of soil was determined.

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Experimental Investigation into Soil-Cutting Performance of the Claws of Mole Rat (Scaptochirus moschatus)

Cited by 31 publications

References 15 publications

Experimental Study of Reciprocating Friction between Rape Stalk and Bionic Nonsmooth Surface Units

Experimental Study of Reciprocating Friction between Rape Stalk and Bionic Nonsmooth Surface Units

Innovative Design and Performance Evaluation of Bionic Imprinting Toothed Wheel

Effects of Bionic Curves on Penetration Force under Difference Soils

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