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果實快速夾持復合碰撞模型研究
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國家自然科學基金資助項目(50905076)、江蘇省博士后基金資助項目(1201028B)和江蘇省高校優(yōu)勢學科建設(shè)工程資助項目(PAPD)


Complex Collision Model in High-speed Gripping of Fruit
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    摘要:

    針對具備持續(xù)動力輸入和果實約束變形兩大特殊性的果實夾持碰撞問題,以果實黏彈性Burgers模型為基礎(chǔ),提出并建立了夾持器恒速模式與負載能力限定下的果實夾持碰撞三階段復合模型。試驗證實初始夾持速度19.2mm/s下,該模型的峰值碰撞力預測誤差僅為1.12%。基于該三階段復合模型對果實夾持碰撞規(guī)律的分析發(fā)現(xiàn),以恒速模式實施果實夾持時,初始夾持速度6mm/s完成綠熟期、變色期、紅熟初期與紅熟中期番茄果實夾持所需時間分別僅為0.62s、1.06s、1.19s和1.24s,而超過10mm/s后繼續(xù)加大初始夾持速度對提高作業(yè)效率的作用有限。峰值碰撞力和果實變形分別與夾持速度呈線性和近似線性關(guān)系,隨著初始夾持速度的提高果實破裂損傷的概率大大增加,當初始夾持速度低于20mm/s時番茄果實損傷概率反而呈現(xiàn)綠熟期最高而紅熟初期最低的現(xiàn)象。該模型為揭示夾持碰撞的特殊規(guī)律和實現(xiàn)果實快速柔順夾持作業(yè)提供了借鑒和依據(jù)。

    Abstract:

    This paper focused on the special collision phenomenon of fruit gripping with its own characteristics of continuous energy input and restrained deformation. The gripping collision process was divided into three stages: constant-speed loading, collision decelerating and stress relaxation, and a three-stage gripping collision model was put forward under the conditions of constant static loading capacity and constant speed control mode, which was based on the stage dynamic characteristic of gripping collision process and viscoelastic Burger`s model of fruits. It was proved by test that the prediction of the peak collision force was feasible, and the predicton error under initial gripping speed of 19.2mm/s was 1.12%. By calculating with this model, it was found that time needed to grip fruit in different ripe period under initial speed of 6mm/s was 0.62~1.24s, and further raising the initial speed might have very limited effectiveness to improve the gripping efficiency. The peak collision force and fruit deformation were proportional and approximately proportional to initial gripping speed, respectively. Probability of skin rupture increased greatly with initial gripping speed. When initial gripping speed was under 20mm/s, probability of skin rupture of green ripening stage and early red ripening stage were the greatest and the least, respectively. This three-stage gripping collision model may provide helpful reference to discover the special law of gripping collision and to achieve high-speed safe gripping of fruits.

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劉繼展,白欣欣,李萍萍,毛罕平.果實快速夾持復合碰撞模型研究[J].農(nóng)業(yè)機械學報,2014,45(4):49-54. Liu Jizhan, Bai Xinxin, Li Pingping, Mao Hanping. Complex Collision Model in High-speed Gripping of Fruit[J]. Transactions of the Chinese Society for Agricultural Machinery,2014,45(4):49-54.

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  • 收稿日期:2013-05-29
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  • 在線發(fā)布日期: 2014-04-10
  • 出版日期: 2014-04-10
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