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Design and experiment of a subsoiling variable rate fertilization machine

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International Journal of Agricultural and Biological Engineering 2020年第4期13卷 118-124页

作者： Jiangtao Qi xinliang tian Yang Li Xuhui Fan Hongfang Yuan Jiale Zhao Honglei Jia Key Laboratory of Bionic Engineering Ministry of EducationJilin UniversityChangchun 130022China College of Biological and Agricultural Engineering Jilin UniversityChangchun 130022China Jilin Province Academy of Agricultural Machinery Changchun 130022China

In order to improve soil fertility and fertilizer utilization,a subsoiling variable rate fertilization machine based on conservation tillage and precision agriculture was designed and *** relationship between suspension parameters and penetrating distance was analyzed,and a matching model between fertilizing quantity and penetrating distance was *** variable rate fertilization control machine was developed based on an Advantech PCM-9363 industrial control *** machine operates under two patterns:DGPS-based positioning and straight-line path positioning based on a planar coordinate *** machine can perform on-demand fertilization according to the spatial differences in soil nutrients and the prescription maps pre-set before the *** experiments showed the machine has a subsoiling stability of 92.5%,a soil breaking rate of 61.1%,a maximum positioning relative error of 2.68%and a maximum variable rate fertilization error of 3.89%.The subsoiling performance and variable rate fertilization indices of this machine satisfy the requirements of GB/*** tested indices meet the national and industrial standards and satisfy the design *** findings of the research can be used as the structural design of the subsoiling variable rate fertilization machine.

关键词： agricultural machinery conservation tillage precision agriculture subsoiling variable rate fertilization

Deterministic wave prediction model for irregular long-crested waves with Recurrent Neural Network

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Journal of Ocean Engineering and Science 2024年第3期9卷 251-263页

作者： Yue Liu Xiantao Zhang Gang Chen Qing Dong Xiaoxian Guo xinliang tian Wenyue Lu Tao Peng State Key Laboratory of Ocean Engineering Shanghai Jiao Tong University(SJTU)Shanghai 200240China SJTU Yazhou Bay Institute of Deepsea Technology SanyaHainan572000China

Real-time predicting of stochastic waves is crucial in marine *** this paper,a deep learning wave prediction(Deep-WP)model based on the‘probabilistic’strategy is designed for the short-term prediction of stochastic *** Deep-WP model employs the long short-term memory(LSTM)unit to collect pertinent information from the wave elevation time *** irregular long-crested waves generated in the deepwater offshore basin at Shanghai Jiao Tong University are used to validate and optimize the Deep-WP *** the prediction duration is 1.92s,2.56s,and,3.84s,respectively,the predicted results are almost identical with the ground *** the prediction duration is increased to 7.68s or 15.36s,the Deep-WP model’s error increases,but it still maintains a high level of accuracy during the first few *** introduction of covariates will improve the Deep-WP model’s performance,with the absolute position and timestamp being particularly advantageous for wave ***,the Deep-WP model is applicable to predict waves with different energy *** proposed Deep-WP model shows a feasible ability to predict nonlinear stochastic waves in real-time.

关键词： Real-time wave prediction Probability LSTM Covariate

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“软尾减阻”述评

上海交通大学学报 2021年第2期55卷 213-214页

作者：田新亮上海交通大学船舶海洋与建筑工程学院海洋工程国家重点实验室上海200240

田新亮研究小组提出了一种简称为“软尾减阻”的新型流动控制方法,即通过在钝体后侧构造柔性封闭体来调节其所受流体载荷及周围流动形态.相比于传统流动控制方法,该方法无需改变控制对象的结构,具有良好的工程应用前景.同时,“软尾减阻... 详细信息

田新亮研究小组提出了一种简称为“软尾减阻”的新型流动控制方法,即通过在钝体后侧构造柔性封闭体来调节其所受流体载荷及周围流动形态.相比于传统流动控制方法,该方法无需改变控制对象的结构,具有良好的工程应用前景.同时,“软尾减阻”引出了一种新的“流-固-流”耦合问题,亟待进一步研究.

关键词：流固耦合减阻流动控制肥皂膜

Wave Run-up and Inline Force Around A Truncated Vertical Circular Cylinder with Different Submergence Depths

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Wave Run-up and Inline Force Around A Truncated Vertical Cir...

An Experimental Investigation on the Motion and Dynamic Responses of A Semisubmersible in Freak Waves

第十七届中国海洋（岸）工程学术讨论会

作者： XIONG Hong YANG Jianmin tian xinliang State Key Laboratory of Ocean Engineering Shanghai Jiao Tong University

Cylindrical structures are widely applied in offshore engineering. Interactions between the waves and offshore structures have been one research hotspot in the field of ocean engineering. This paper focuses on the wave run-up and inline force around a truncated vertical circular cylinder. Experimental studies are carried out in the wave flume at Shanghai Jiao Tong University in China. The diameter of the cylinder(D) is 10 cm and five submergence depths(), i.e., =0.5D, 1D, 2D, 3D, 4D, are considered, respectively. For a cylinder, the results clearly show decreases in the non-dimensional magnitudes of the inline force with the decreasing incident-wave steepness or the increasing scatter parameter. But for the cylinder with different submergence depths, there are different relationships between the inline force and submergence depths.

关键词： wave run-up inline wave force submerged depths

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An Experimental Investigation on the Motion and Dynamic Resp...

第十七届中国海洋（岸）工程学术讨论会

作者： DENG Yanfei YANG Jianmin XIAO Longfei tian xinliang LI Jun State Key Laboratory of Ocean Engineering Shanghai Jiao Tong University

The present research aims at experimentally clarifying the effects of freak wave on the motion and dynamic responses of a semisubmersible. To reveal the effects of mooring stiffness, two mooring systems were employed in the formal tests. The 6-dof motion responses and mooring tensions have been measured and the 3-dof motions of fairleads were calculated as well. From the time series, trajectories and statistics information, the interactions between the freak wave and the reference semisubmersible have been demonstrated and the effects of mooring stiffness have been identified. Experimental results show that the freak wave is likely to cause large horizontal motions for soft mooring system and to result in extremely large mooring tensions for tight mooring system. Therefore, the freak wave is a real threat for the marine structure, which needs to be carefully considered at design stage.

关键词： motion response mooring tension semisubmersible freak wave mooring stiffness

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基于连续变载方法的海洋工程模型试验研究

中国造船 2024年第3期65卷 94-105页

作者：陈宇李新超郭孝先田新亮上海交通大学海洋工程国家重点实验室上海200240 海洋石油工程股份有限公司天津300461 上海交通大学三亚崖州湾深海科技研究院三亚572024

为提升浮托安装的效率与成功率,提出一种连续变载模型试验方法,将压载水舱模块化,配合自研的压载调节系统,灵活调节压载分布,能快速连续地调整船舶重量和重心位置分布。同时利用HydroD软件和连续变载模型试验方法,进行波浪作用下的驳船... 详细信息

为提升浮托安装的效率与成功率,提出一种连续变载模型试验方法,将压载水舱模块化,配合自研的压载调节系统,灵活调节压载分布,能快速连续地调整船舶重量和重心位置分布。同时利用HydroD软件和连续变载模型试验方法,进行波浪作用下的驳船运动响应研究。对比数值计算与试验结果,固有周期最大误差仅为3.3%。自研的压载调节系统可在2%误差内快速实现压载调节,调节效率较高。相较于传统压载调节方法,连续变载模型试验方法可真实模拟动态压载调节过程,实现全过程连续监测,为开展相关有变载需求的船舶模型试验提供参考。

关键词：模型试验连续变载水舱划分控制策略压载系统

矩形截面半潜式平台浪流耦合作用涡激运动响应二维数值模拟

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上海交通大学学报 2016年第3期50卷 460-465,471页

作者：吴凡肖龙飞刘明月田新亮上海交通大学海洋工程国家重点实验室上海200240

通过计算流体力学(CFD)数值模拟,针对一型采用矩形截面立柱设计的深吃水半潜式生产平台,研究其在波浪和流共同作用时的涡激运动响应.选取典型135°来流方向,以正弦振荡流模拟波浪,考虑不同KC数、不同相对流数下波浪与同向均匀流耦合作用... 详细信息

通过计算流体力学(CFD)数值模拟,针对一型采用矩形截面立柱设计的深吃水半潜式生产平台,研究其在波浪和流共同作用时的涡激运动响应.选取典型135°来流方向,以正弦振荡流模拟波浪,考虑不同KC数、不同相对流数下波浪与同向均匀流耦合作用.研究表明,较之于仅有均匀流作用,均匀流和正弦振荡流耦合作用时,矩形截面立柱的半潜式平台运动响应明显增大.振荡流耦合作用影响显著.

关键词：深吃水半潜式平台涡激运动数值模拟振荡流均匀流

大型漂浮式风电装备耦合动力学研究:历史、进展与挑战

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力学进展 2022年第4期52卷 731-808页

作者：温斌荣田新亮李占伟彭志科上海交通大学海洋工程国家重点实验室上海交通大学三亚崖州湾深海科技研究院南京航空航天大学直升机传动技术国家级重点实验室上海交通大学机械系统与振动国家重点实验室宁夏大学机械工程学院

风电是可再生能源的主力军,在优化能源结构、缓解气候变化方面发挥着重要作用.经过数十年的发展,风电装备逐渐向大型化和离岸化方向发展,并由此形成“由陆向海,由浅入深,由固定式向漂浮式”的演变之路.在水深大于50米的深远海域,采用漂... 详细信息

风电是可再生能源的主力军,在优化能源结构、缓解气候变化方面发挥着重要作用.经过数十年的发展,风电装备逐渐向大型化和离岸化方向发展,并由此形成“由陆向海,由浅入深,由固定式向漂浮式”的演变之路.在水深大于50米的深远海域,采用漂浮式支撑基础搭载大型或超大型风电机组是兼顾技术可行度和成本优势的理想选择.如今,大型漂浮式风机已成为下一代深远海风能大规模开发的主力装备,是深化海洋风能开发的先导战略性高端装备,是风电领域的研究热点和技术高地.本文围绕大型漂浮式风电装备耦合动力学问题,综述了国内外浮式风电技术的发展历程和研究现状,结合作者团队多年的研究与实践经验,介绍了浮式风机耦合动力学及其优化控制中的基础问题与研究现状,总结了现阶段浮式风机耦合动力学研究中的困难与挑战,为浮式风电研究人员提供参考.

关键词：浮式风机耦合动力学空气动力学模型试验半实物试验振动控制

4JSM-2000B型残膜回收机棉秆粉碎装置设计与试验

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农机化研究 2020年第11期42卷 81-85,93页

作者：赵岩严昌荣田辛亮刘勤农业农村部农膜污染防控重点实验室北京100081 石河子大学机械电气工程学院新疆石河子832000

地膜残留现已成为影响新疆棉区可持续发展的主要因素,而现有的残膜回收机具大多存在含杂率高的问题。为解决上述问题,研制了一种新型棉秆粉碎装置,主要由悬挂架、动力传递系统、刀片及刀辊等部件组成。该机采用螺旋单侧输出搅龙,将粉碎... 详细信息

地膜残留现已成为影响新疆棉区可持续发展的主要因素,而现有的残膜回收机具大多存在含杂率高的问题。为解决上述问题,研制了一种新型棉秆粉碎装置,主要由悬挂架、动力传递系统、刀片及刀辊等部件组成。该机采用螺旋单侧输出搅龙,将粉碎后的棉秆侧抛至地面,降低了残膜含杂率。设计了刀片线速度、刀辊旋转半径、刀辊转速及螺旋输送机构,并确定其结构尺寸。田间试验结果表明:当刀辊转速2200r/min、刀片离地高度60mm、机具作业速度1.5m/s时,棉秆粉碎合格率为90.2%,本研究可为棉秆粉碎装置的设计与改进提供理论支持。

关键词：棉秆粉碎残膜回收分析