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小型電動(dòng)割草機(jī)刀盤(pán)變形試驗(yàn)分析與仿真
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Simulation of Minitype Grass Trimmer’s Cutter Deformation
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    摘要:

    割草機(jī)刀盤(pán)的旋轉(zhuǎn)變形是導(dǎo)致其產(chǎn)生機(jī)械振動(dòng)噪聲的主要因素之一。利用高速數(shù)碼攝像機(jī)分別拍攝了割草機(jī)刀盤(pán)在無(wú)保護(hù)端蓋和有保護(hù)端蓋狀態(tài)下的旋轉(zhuǎn)變形圖像，獲得了刀盤(pán)的高速旋轉(zhuǎn)變形曲線，分析了產(chǎn)生變形的原因；并在試驗(yàn)的基礎(chǔ)上建立了刀盤(pán)的有限元模型，通過(guò)ANSYS分析軟件，模擬了刀盤(pán)的徑向變形情況，分析了徑向變形與刀盤(pán)結(jié)構(gòu)和電動(dòng)機(jī)轉(zhuǎn)速之間的關(guān)系。減小刀盤(pán)大孔面積能使刀盤(pán)最大徑向位移減小(在12.000r/min時(shí)，減小約30%)；維持電動(dòng)機(jī)轉(zhuǎn)速在8.000r/min左右，可使最大徑向位移不超過(guò)0.2mm，刀盤(pán)運(yùn)轉(zhuǎn)平穩(wěn)。

    Abstract:

    The cutter’s rotating deformation plays an important role which caused the vibration noise of grass trimmer. Highspeed video camera was applied to get the deformation images of grass trimmer’s cutter with protecting cover and without it. The tendencies and reasons of deformation were proposed. The finite element model of cutter based on experiment was established, the radial deformation was simulated by ANSYS, and the relations of the radial deformation between the cutter structure and rotational speed were analyzed. Reducing the area of big hole in the cutter could decrease the maximum radial deformation (in 12.000r/min, the value decreased by about 30%); Maintaining the motor speed at 8.000r/min around could control the maximum radial deformation below 0.2mm and keep a smooth moving. 

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單春賢,邵 霞,劉 濤,楊敏官.小型電動(dòng)割草機(jī)刀盤(pán)變形試驗(yàn)分析與仿真[J].農(nóng)業(yè)機(jī)械學(xué)報(bào),2010,41(12):80-. Shan Chunxian, Shao Xia, Liu Tao, Yang Minguan. Simulation of Minitype Grass Trimmer’s Cutter Deformation[J]. Transactions of the Chinese Society for Agricultural Machinery,2010,41(12):80-.

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