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| 1 | Radiation-pressure-driven mechanical oscillations in silica microdisk resonators on chip显示文摘We demonstrate radiation-pressure-driven mechanical oscillations from high optical quality factor silica microdisk resonators on chip. Mechanical quality factors of 3520 in air and 12540 in vacuum for the fundamental radial breathing modes are obtained from 73 μm-diameter silica microdisks with mechanical frequencies of ~51 MHz. The measured mechanical oscillation threshold powers for the input light are determined to be 62.5 μW in air and down to 26.6 μW in vacuum. | WANG GuanZhong ZHAO MingMing MA JiYang LI GuanYu CHEN Yuan JIANG XiaoShun XIAO Min | 2015 | Science China(Physics,Mechanics & Astronomy)2015，58，5： | 6 |
| 2 | Demonstration of an ultra-low-threshold phonon laser with coupled microtoroid resonators in vacuum显示文摘We demonstrate an ultra-low-threshold phonon laser using a coupled-microtoroid-cavity system by introducing a novel coupling approach.The scheme exhibits both high optical quality factors and high mechanical quality factors.We have experimentally obtained the mechanical quality factor up to 18,000 in vacuum for a radialbreathing mode of 59.2 MHz.The measured phonon lasing threshold is as low as 1.2μW,which is~5 times lower than the previous result. | GUANZHONGWANG MINGMING ZHAO YINGCHUN QIN ZHANGQI YIN XIAOSHUN JIANG MIN XIAO | 2017 | Photonics Research2017，5，2： | 2 |
| 3 | Numerical Simulation for Damping-Controlled Deployment of Z-Folded Inflatable Tube显示文摘The damping-controlled deployment technology of flexible Z-folded inflatable tube is one of the key technologies of space inflatable structures.Constraint failure between couple nodes is proposed to simulate the damping-controlled deployment.And the equation of constraint failure is established.Inflation process of Z-folded tube is simulated with control volume method.Compared with uncontrolled method,it is indicated that the new method can effectively solve the disordered deployment problem of the slender Z-folded inflatable tube.By analyzing the displacement of the apical of the folded tube with different constraint forces during deployment process,the concept of effective constraint force is proposed.In the effective region of constraint force,the folded tube deploys with little retraction and fluctuation.Otherwise,The flexible folded tube would deploy disorderly or even cannot deploy.The simulation method and numerical results have a theoretical and instructive significance to the research on the space inflatable structures. | Yu Li Zhan Yanan Shi Yingfeng Zhao Xiaoshun Liu Xin | 2017 | Transactions of Nanjing University of Aeronautics and Astronautics2017，34，4： | 2 |
| 4 | Design and experiment of the double-seed hole seeding precision seed metering device for peanuts显示文摘A secondary seeding precision double-seed peanut hole seeding seed metering device was designed to improve the performance of the peanut planting equipment and provide a solution for problems on the high seed charge that can cause poor cavitation and uniformity easily.The main structure and operation parameters in terms of groove length,seed charge height,seed-bed belt speed,and rotation speed of the seed metering wheel were determined through theoretical analysis.Single-factor and orthogonal tests were carried out through the JPS-12 seed metering device test bench,and the peanut variety Jinonghua-3 was selected as the test object.The single hole double-seed rate,qualified rate,the variation coefficient of hole spacing,and hole rate were chosen for evaluating the working performance.The results of the single-factor test showed that the seed metering performance is mainly affected by the groove length,the speed of the seed-bed belt and the rotation speed of the seed metering wheel,and the influence of the cavitation rate is minimal.The optimal seeding height is determined to be 40 mm.The results of the orthogonal test showed that the groove length was 27.3 mm,the seed-bed belt speed was 1.51 km/h,and the rotation speed of the seed metering wheel was 14.11 r/min.What’s more,a regression model based on the orthogonal test results was established,the qualified rate of the number of holes obtained after optimizing the model was 98.84%,the variation coefficient of hole spacing was 9.74%,and the hole rate was 1.40%.Notably,the working performances of the device can meet the requirement of precision seeding. | Xiaoshun Zhao Wenjing Ran Jianjun Hao Wenjie Bai Xinlei Yang | 2022 | International Journal of Agricultural and Biological Engineering2022，15，3： | 1 |
| 5 | Parameter optimization and experiment of the negative pressure precision seed-metering device for wheat显示文摘In order to ensure the most reasonable distribution of wheat seeds in the field to improve seeding quality and uniformity,a set of negative pressure precision seed-metering device was designed,which shares a hollow shaft.Every seed-metering device can sow two rows of wheat.By the STAR-CCM+,the analysis of nephogram,vectogram and streamline graph showed that more ideal structural parameters of the seed-metering device are 0.5 mm width of the slit sucking seed(WSS),150-200 mm diameter of the seed-metering disc(DSD),2.0 mm axial depth of air chamber in the seed-metering disc(ADS),and arc-shaped cross-section shape of the ring groove sucking seed(CSGS).Single-factor test on the JPS-12 test-bed analyzed the influence of the CSGS,WSS,DSD,and ADS on the qualified index(Iq),multiple index(Imul),miss index(Imiss)and coefficient of variation of qualified seed spacing(CV).Through the orthogonal on the JPS-12 test-bed,it is found that the influence of vacuum negative pressure and seed-metering device shaft speed is significant on the Iq,Imiss and Imul.Based on these,the structural parameters of the seed-metering device were optimized.The DSD is 180 mm,the WSS is 0.7 mm,the ADS is 2.5 mm,and the CSGS is arc-shaped.The optimization seed-metering device was tested on the JPS-12 test-bed.The Iq is 86.66%,the Imiss is 5.09%,the Imul is 8.25%,and the CV is 24.50%.These testing results fully coincide with the standard JB/T 10293-2013 Specifications of single seed drill(precision drill).The seed-metering device meets fully the requirements for wheat precision seeding. | Yubo Feng Xiaoshun Zhao Jincai Li Huali Yu Hongpeng Zhao Baozhong Yin | 2024 | International Journal of Agricultural and Biological Engineering2024，17，1： | 0 |
| 6 | Study on positive-negative pressure seed metering device for wide-seedling-strip-seeding显示文摘In order to solve the problem of poor uniformity of wheat strip sowing,this paper designs a positive-negative pressure wheat wide-seedling-strip-seeding precision seed metering device,which adopts the roller structure with the principle of combined positive-negative pressure.Through theoretical analysis and relevant data,the structure of the seed metering device and the structure of the positive-negative pressure air chamber were designed.The internal flow field conditions were simulated by Fluent software under different structural parameters.The design of the seed holes was completed by analyzing the pressure cloud diagram and the flow velocity vector diagram,and the optimal combination of parameters was obtained and the influence law of negative pressure on the flow field was obtained.The effect of rotational speed on the flow field was studied by EDEM-Fluent coupling technique.In this paper,a three-factor and three-level response surface test was conducted on a JPS-12 test bench with Liangxin-99 wheat as the research object.The experiment was conducted with the rotational speed of seed metering device,the negative pressure of seed suction and the seeding height as factors,and the qualified index,the reseeding index and the miss-seeding index as evaluation indicators.Through the test,the optimal structure and working parameters of the seed metering device were determined as follows:the diameter of the seed hole was 2 mm,and the number of seed holes per row was 28,negative pressure was−3.5 kPa,rotational speed of seed metering device was 19 r/min,and seeding height was 180 mm.Validation test was carried out on the optimized seed metering device:the qualified index was 80.62%,the reseeding index was 9.22%,and the miss-seeding index was 10.16%,which reached the parameter indicator in JB/T 10293-2013 Technical conditions of single seed(precision)seeder and met the agronomic requirements for wheat wide-seedling-strip-seeding. | Xiaoshun Zhao Wenjie Bai Jincai Li Huali Yu Dawei Zhao Baozhong Yin | 2022 | International Journal of Agricultural and Biological Engineering2022，15，6： | 0 |
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