Abstract
In order to improve the working performance of cassava harvester, structural bionic design for its digging shovel was conducted. Taking the oriental mole cricket's paws as bionic prototype, a new structural bionic design method for digging shovel was established, which considers the morphology-configuration-function coupling bionic. A comprehensive performance comparison method was proposed, which is used to select the bionic design schemes. The proposed bionic design method was used to improve digging shovel structure of a digging-pulling style cassava harvester, and nine bionic-type digging shovels were obtained with considering the impact of soil mechanics. After conducting mechanical properties comparative analysis for bionic-type digging shovels, the bionic design rules were summed up, and the optimal design scheme of digging shovel was obtained through combining the proposed comprehensive performance comparison method with Analytic Hierarchy Process (AHP). Studies have shown that bionic design method not only can improve the overall mechanical properties of digging shovel, but also can help to improve the harvesting effect of cassava harvester, which provides a new idea for crops harvesting machinery's structural optimization design.
Highlights
Cassava is a important food crop and new energy material, which is widely cultivated in tropical and subtropical regions [1, 2]
(1) The bionic-type digging shovels’ stress distribution figures show that the stress is mainly in the shovel ear and connecting rod part; the maximum stress occurs at the junction between shovel ear and shovel surface, so the strength problem of this part should be considered when designing and manufacturing the digging shovel
(1) The oriental mole cricket’s forepaws were used to design nine bionic-type digging shovels with considering soil mechanics, and the optimal bionic-type design scheme was obtained through combining Analytic Hierarchy Process (AHP) with comprehensive performance comparison method proposed in this paper
Summary
Cassava is a important food crop and new energy material, which is widely cultivated in tropical and subtropical regions [1, 2]. Biological structures have excellent mechanical properties and delicate conformation after millions of years of evolution in the nature, which provides a lot of bionic design prototype and creative improvement methods for mankind to solve the agricultural machinery structural optimization problem [3]. Conducting structural bionic design for soilengaging parts to improve their mechanical properties is a very valuable research approach, which has a good reference for multi-objective optimization design of cassava harvester’s digging shovel. Simulating the conformation characteristics and mechanical properties of soil animal’s claw toe is an effective way to obtain the structural bionic design method for cassava harvester’s digging shovel. The structural bionic design for digging shovel will make it has good structure and mechanical properties, and can help to improve the harvesting performance of the cassava harvester
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