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自適應(yīng)低振動(dòng)步行輪仿生設(shè)計(jì)與性能分析
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國家自然科學(xué)基金項(xiàng)目(51675221、51275199)


Bionic Design and Performance Analysis of Adaptive Low Vibration Walking Wheel
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    為提高具有高通過性的步行輪平順性,基于鴕鳥足運(yùn)動(dòng)姿態(tài)與跖趾關(guān)節(jié)儲(chǔ)能減振機(jī)理,運(yùn)用工程仿生學(xué)原理與技術(shù),設(shè)計(jì)了一種仿生自適應(yīng)低振動(dòng)步行輪。有限元數(shù)值模擬結(jié)果表明,輪上載荷30N,角速度10(°)/s情況下,相比于傳統(tǒng)步行輪,仿生步行輪輪心波動(dòng)范圍在軟路面和硬路面分別降低了85.71%和93.33%。采用輕載荷月壤/車輪土槽測試系統(tǒng)驗(yàn)證了仿生步行輪的減振性能。當(dāng)滑轉(zhuǎn)率小于40%時(shí),仿生步行輪的掛鉤牽引力均大于傳統(tǒng)步行輪;當(dāng)滑轉(zhuǎn)率大于40%,且僅在角速度為20(°)/s時(shí),仿生步行輪的掛鉤牽引力才小于傳統(tǒng)步行輪,表明仿生步行輪在松軟地面具有較好的牽引通過性。同時(shí),相比于傳統(tǒng)步行輪,當(dāng)角速度為30(°)/s時(shí),仿生步行輪在軟路面和硬路面的加速度分別減少了6.3%和15.8%,振幅分別減小了14.6%和9.6%。在保證松軟地面優(yōu)越牽引通過性能前提下,仿生步行輪比傳統(tǒng)步行輪的輪心波動(dòng)更小,振動(dòng)明顯降低,有效解決了步行輪多邊形效應(yīng)引起的振動(dòng)問題。

    Abstract:

    Based on ostrich foot locomotion posture, energy storage and vibration reduction mechanism of the metatarsophalangeal joint (MTP), a bionic adaptive low vibration walking wheel was designed to improve the low vibration performance. Through the finite element method (FEM), motion process of the walking wheel was analyzed on the soft/hard ground. The result showed that under the condition of 30N load and 10(°)/s, the fluctuation range of the bionic walking wheel center was reduced by 85.71% and 93.33% on the soft and hard ground, respectively. In order to further verify the vibration reduction performance of the bionic walking wheel, the light load of lunar soil/wheel interaction test system was employed for test. When the slip ratio was smaller than 40%, the drawbar pulling force of the bionic walking wheel was all larger than the traditional walking wheel. When the slip ratio was larger than 40% and the speed was 20(°)/s, the drawbar pulling force of the bionic walking wheel was less than the traditional walking wheel. The results showed that the bionic walking wheel was provided with better traction and passing-through performances on the soft ground. Under the condition of 30(°)/s, the accelerations were reduced by 6.3% and 15.8% on the soft and hard ground, respectively. Meanwhile, the amplitudes were reduced by 14.6% and 9.6%, respectively. On the premise that passingthrough performances of the bionic wheel was assured, combining the simulation and test data on the soft and hard ground, the wheel center fluctuation of the bionic walking wheel was smaller than that of the traditional walking wheel. Therefore, the vibration of the walking wheel, caused by polygon effect, was solved effectively.

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何彥虎,韓佃雷,李國玉,羅剛,張銳.自適應(yīng)低振動(dòng)步行輪仿生設(shè)計(jì)與性能分析[J].農(nóng)業(yè)機(jī)械學(xué)報(bào),2018,49(3):418-426. HE Yanhu, HAN Dianlei, LI Guoyu, LUO Gang, ZHANG Rui. Bionic Design and Performance Analysis of Adaptive Low Vibration Walking Wheel[J]. Transactions of the Chinese Society for Agricultural Machinery,2018,49(3):418-426.

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  • 收稿日期:2017-08-06
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  • 在線發(fā)布日期: 2018-03-10
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