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月球車輪與月壤相互作用動(dòng)力學(xué)模擬
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    摘要:

    在分析月球車輪與月壤相互作用的基礎(chǔ)上，應(yīng)用離散元軟件PFC2D對(duì)月球車輪在月壤上的牽引通過(guò)性能進(jìn)行了模擬研究,。通過(guò)雙軸試驗(yàn)調(diào)整離散元力學(xué)模型的細(xì)觀參數(shù),，得到月壤離散元接觸力學(xué)模型：其內(nèi)摩擦角為42°,，凝聚力為1.554 kPa,，泊松比為0.41,，彈性模量為77.5 MPa,；通過(guò)顆粒與月球車輪接觸的平均剛度,，確定了車輪前進(jìn)時(shí)的水平速度與沉降速度增量,；在相同試驗(yàn)條件下,，模擬試驗(yàn)與土槽試驗(yàn)的對(duì)比結(jié)果表明，兩者趨勢(shì)一致,；有輪刺輪與光滑輪的牽引通過(guò)性能對(duì)比結(jié)果表明,，在沒(méi)有牽引阻力情況下，有輪刺輪滑轉(zhuǎn)率為零,，光滑輪滑轉(zhuǎn)率為1.8%,；當(dāng)滑轉(zhuǎn)率為10%時(shí)，光滑輪掛鉤牽引力為7.71 N,，有輪刺輪掛鉤牽引力為

    Abstract:

    121.6 N,。Based on the analysis of FEM (finite element method) and DEM (discrete element method), the research considered that the DEM is feasible and superior to the FEM in simulating the interaction between wheel and the lunar soil. The model of the interaction between rigid wheel and lunar soil has been set up. The system of soil bin was simulated by means of software PFC2D. Parameters of the lunar soil for DEM model were confirmed in the biax test, and the angle of internal friction was 42°, the cohesion was 1.554 kPa, the Poisson radio was 0.41, and the Young's modulus was 77.5 MPa. The DEM model of the slip, sinkage, and draw-bar pull were found, which were checked out by the soil bin test. The results showed that the trend is consistent. Finally, the traffic ability of nonrug-wheel and the rug-wheel were compared, and the results showed that the slip radio was zero of the rug-wheel and was 1.8% of the nonrug-wheel under the tractive resistance was zero, and the draw-bar pull was 121.6 N of the rug-wheel and was 7.71 N of the nonrug-wheel, when the clip ratio is 10%. 

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李建橋,鄒猛,賈陽(yáng),任露泉,李因武.月球車輪與月壤相互作用動(dòng)力學(xué)模擬[J].農(nóng)業(yè)機(jī)械學(xué)報(bào),2008,39(4):1-4.[J]. Transactions of the Chinese Society for Agricultural Machinery,2008,39(4):1-4.

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