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| 1 | Height stability control of a large sprayer body based on air suspension using the sliding mode approach显示文摘When a high clearance self-propelled sprayer sprays,the sprung mass varies with the amount of liquid in the tank,which causes a change in the height of the sprayer body.This change not only is harmful to the sprayer ride comfort,but also has a greater impact on the sprayer application quality.In this paper,a large-scale high clearance self-propelled sprayer with air suspension was taken as the research object.Based on vehicle dynamics and air thermodynamics theory,a mathematical model of air spring inflation/deflation was established,then a 3 degree of freedom(3-dof)vertical dynamics model of sprayer air suspension was built.On this basis,the height control strategy of the sprayer body was formulated.Due to the nonlinear characteristics of air suspension,two control algorithms,namely sliding mode control and the on-off control,were used to design the suspension height stability controller,respectively.A simulation experiment was carried out by using the sprayer spraying crops as an example.The simulation experiment results showed that sliding mode control and on-off control could track and stabilize the height of the sprayer body when it changed under no excitation and D-grade road random excitation.However,due to strong nonlinearity and hysteresis of the pneumatic system,on-off control precision was poor.With the on-off control method,further reduction of the sprung mass would change the internal parameters of the pneumatic system,cause the air spring over deflation,even worse,the over deflation phenomenon presented a serious trend and cause system instability under random road excitation.Compared with on-off control method,sliding mode control approach had good control ability and precision due to its robustness to change in model parameters.The research will provide a reference for the height stability adjustment of large high clearance self-propelled sprayers during spraying and dosing operations. | Yu Chen Shuo Zhang Enrong Mao Yuefeng Du Jun Chen Shanju Yang | 2020 | Information Processing in Agriculture2020，7，1： | 4 |
| 2 | Effects of n -butanol, 2-butanol, and methyl octynoate addition to diesel fuel on combustion and emissions over a wide range of exhaust gas recirculation (EGR) rates显示文摘 | Haifeng Liu Shanju Li Zunqing Zheng Jia Xu Mingfa Yao | 2013 | Applied Energy2013，，： | 2 |
| 3 | Association between magnetic properties and element concentration of Liverpool street dust and its implications显示文摘 | Xie Shanju John A Dearing John F Boyle | 2001 | Journal of Applied Geophysics2001，48，： | 1 |
| 4 | Mac- roscopic Fibers of Well-Aligned Carbon Nanotubes by Wet Spin- ning显示文摘 | Zhang Shanju Koziol Krzysztof K K Kinloch Ian A | 2008 | Small2008，4，8： | 1 |
| 5 | Effects of n-butanol, 2-butanol, and methyl octynoate addition to diesel fuel on combustion and emissions over a wide range of exhaust gas recirculation (EGR)rates 显示文摘 | Liu Haifeng Li Shanju Zheng Zunqing | 2013 | Ap- plied Energy2013，112，： | 1 |
| 6 | Design and experiment of a high-clearance self-propelled sprayer chassis显示文摘A large high-clearance self-propelled sprayer chassis was designed according to the requirements of the sprayer’s driving operation and the overall goal.The structural characteristics and working principle of the chassis drive system,suspension system,track adjustment system,and frame were analyzed.A finite element analysis of the frame was carried out under four extreme conditions:full load bending,full load torsion,full load emergency braking and full load emergency turning.Under these four conditions,the maximum stress values of the frame were 149.45 MPa,219 MPa,151.44 MPa,and 123.27 MPa respectively,and the maximum strain values were 1.12 mm,2.22 mm,0.95 mm,and 1.16 mm respectively.A theoretical analysis of the stability,steering ability,and obstacle navigation of the sprayer chassis was conducted.The results showed that the upper angleθlim,lower angleθ׳lim and lateral limit tumbling angleφlim of the sprayer chassis were 50.1°,30.0°and 35.3°respectively.The minimum turning radius of the chassis was 5816 mm,and the minimum turning width was 4113 mm.The maximum obstacle crossing heights of the front and rear wheels were 466 mm and 457 mm.The theoretical analysis showed that the designed chassis met the field management operations of large plots.A field experiment of the high-clearance self-propelled sprayer chassis at full load was conducted.The experimental results were consistent with the theoretical analysis results.The sprayer chassis not only good handling stability but also good ride comfort.The results of this study provide references for the design of high-clearance self-propelled sprayer chassis. | Yu Chen Enrong Mao Wei Li Shuo Zhang Zhenghe Song Shanju Yang Jun Chen | 2020 | International Journal of Agricultural and Biological Engineering2020，13，2： | 0 |
| 7 | Mom,I Understand You显示文摘To celebrate Mother’s Day, the editors of Society Weekly(published by People’s Daily) invited their readers to write and submit 'A Sentence for Mother.' This activity, which was co-sponsored by the 'Program of Happiness,' garnered quite an emotional response. Among the contributions we received were several from the 21 students of Class Three, Grade Two of the high school affiliated with the Beijing Institute of Clothing Technology. 'Mother, you are a towering tree and I am your shadow. '—ZHANG YE 'Mother, you are an umbrella, and we are the children under it. You are the pod, and we are the peas.'—XU | ZHANG SHANJU (Journalist, People’s Daily) A RONG | 1998 | Women of China1998，，8： | 0 |
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