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Preliminary 3D printing of large inclined-shaped alumina ceramic parts by direct ink writing

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Journal of Advanced Ceramics 2020年第3期9卷 312-319页

作者： liangliang yang Xiaojun ZENG Allah DITTA Bo FENG Lizhong SU Yue ZHANG Key Laboratory of Aerospace Materials and Performance(Ministry of Education) School of Materials Science and EngineeringBeihang UniversityBeijing 100191China Department of Chemistry and Biochemistry University of California Santa BarbaraSanta BarbaraCalifornia 93106United States

Three dimensional(3D)printing technology by direct ink writing(DIW)is an innovative complex shaping technology,possessing advantages of flexibility in fabrication,high efficiency,low cost,and ***,3D printing of complex alumina ceramic parts via DIW using thermally induced solidification with carrageenan swelling was *** rheological properties of the slurry under different thermally-induced modes were systematically *** solidification properties of thermally-induced pastes with varying contents of carrageenan were *** experimental results showed that the optimized paste consisting of 0.4 wt%carrageenan could be rapidly solidified at about 55℃,which could print inclined-plane more than 60°in vertical without support,resulting in better homogeneity of the green body.A nearly pore-free structure was obtained after sintering at 1600℃ for 2 h.

关键词： three dimensional(3D)printing alumina paste solidification prcperty thermally-induced carrageenan

Development of uncut crop edge detection system based on laser rangefinder for combine harvesters

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International Journal of Agricultural and Biological Engineering 2016年第2期9卷 21-28页

作者： Zhao Teng Noboru Noguchi yang liangliang Kazunobu Ishii Chen Jun College of Mechanical and Electronic Engineering Northwest A&F UniversityYangling 712100China Vehicle Robotics Laboratory Graduate School of AgricultureHokkaido UniversitySapporoJapan

The objective of this research was to develop an uncut crop edge detection system for a combine harvester.A laser rangefinder(LF)was selected as a primary sensor,combined with a pan-tilt unit(PTU)and an inertial measurement unit(IMU).Three-dimensional field information can be obtained when the PTU rotates the laser rangefinder in the vertical plane.A field profile was modeled by analyzing range ***’s method was used to detect the crop edge position on each scanning profile,and the least squares method was applied to fit the uncut crop *** performance of the system was first evaluated under laboratory ***,validation experiments were conducted under both static and dynamic conditions in a wheat field during harvesting *** verify the error of the detection system,the real position of the edge was measured by GPS for accuracy *** results showed an average lateral error of±12 cm,with a Root-Mean-Square Error(RMSE)of 3.01 cm for the static test,and an average lateral error of±25 cm,with an RMSE of 10.15 cm for the dynamic *** proposed laser rangefinder-based uncut crop edge detection system exhibited a satisfactory performance for edge detection under different conditions in the field,and can provide reliable information for further study.

关键词： laser rangefinder technology crop edge detection combine harvester navigation field profile modeling

M-LFM:a multi-level fusion modeling method for shape−performance integrated digital twin of complex structure

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Frontiers of Mechanical Engineering 2022年第4期17卷 91-110页

作者： Xiwang HE Xiaonan LAI liangliang yang Fan ZHANG Dongcai ZHOU Xueguan SONG Wei SUN School of Mechanical Engineering Dalian University of TechnologyDalian 116024China Sany Marine Heavy Industry Co. Ltd.Zhuhai 519090China

As a virtual representation of a specific physical asset,the digital twin has great potential for realizing the life cycle maintenance management of a dynamic ***,the dynamic stress concentration is generated since the state of the dynamic system changes over *** generation of dynamic stress concentration has hindered the exploitation of the digital twin to reflect the dynamic behaviors of systems in practical engineering *** this context,this paper is interested in achieving real-time performance prediction of dynamic systems by developing a new digital twin framework that includes simulation data,measuring data,multi-level fusion modeling(M-LFM),visualization techniques,and fatigue *** leverage its capacity,the M-LFM method combines the advantages of different surrogate models and integrates simulation and measured data,which can improve the prediction accuracy of dynamic stress concentration.A telescopic boom crane is used as an example to verify the proposed framework for stress prediction and fatigue analysis of the complex dynamic *** results show that the M-LFM method has better performance in the computational efficiency and calculation accuracy of the stress prediction compared with the polynomial response surface method and the kriging *** other words,the proposed framework can leverage the advantages of digital twins in a dynamic system:damage monitoring,safety assessment,and other aspects and then promote the development of digital twins in industrial fields.

关键词： shape−performance integrated digital twin(SPI-DT) multi-level fusion modeling(M-LFM) surrogate model telescopic boom crane data fusion

Assessment of the curving performance of heavy haul trains under braking conditions

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Journal of Modern Transportation 2015年第3期23卷 169-175页

作者： liangliang yang Yu Kang Shihui Luo Maohai Fu Traction Power State Key Laboratory Southwest Jiaotong University School of Mechanical Engineering Southwest Jiaotong University

To study the curving performance of trains, 1D and 3D dynamic models of trains were built using nu- merical methods. The 1D model was composed of 210 simple wagons, each allowed only longitudinal motion; whereas the 3D model included three complicated wagons for which longitudinal, lateral, and vertical degrees of freedom were considered. Combined with the calculated results from the 1D model under braking conditions, the behavior of draft gears and brake shoes were added to the 3D model. The assessment of the curving performance of trains was focused on making comparisons between idling and braking conditions. The results indicated the following： when a train brakes on a curved track, the wheel-rail lateral force and derailment factor are greater than under idling conditions. Because the yawing movement of the wheelset is limited by brake shoes, the zone of wheel contact along the wheel tread is wider than under idling conditions. Furthermore, as the curvature becomes tighter, the traction ratio shows a nonlinear increasing trend, whether under idling or braking conditions. By increasing the brake shoe pressure, train steering becomes more difficult.

关键词： Heavy haul train · Curving performance ·Draft gear · Brake shoe · Wheel-rail · Derailment safetyWheel wear power · Traction ratio

CuS Electrode for All-pH Electrolyte in Aqueous Batteries

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Journal of Harbin Institute of Technology(New Series) 2022年第6期29卷 64-73页

作者： liangliang yang Mangwei Cui Qingjiang Liu Hao Lei Yan Huang Sauvage Laboratory for Smart Materials School of Materials Science and EngineeringHarbin Institute of TechnologyShenzhen 518055GuangdongChina Shenzhen Key Laboratory of Flexible Printed Electronics Technology Harbin Institute of TechnologyShenzhen 518055GuangdongChina State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin 150001China

With their excellent safety, affordability, environmental friendliness and high ionic conductivity, aqueous batteries are prospective contenders to replace lithium-ion batteries. However, the pH of aqueous electrolyte might impact the battery’s electrochemical performance and even its normal operation. It is critical to develop an electrode that can work in different pH settings. The hydrothermal method and vulcanization treatment were used to successfully create copper sulfide(CuS) nanosheet in this work. It can store and transport nonmetal and metal ions as well as polyvalent ions with a high charge radius ratio, and function normally under a variety of pH conditions. The CuS electrode has a considerable capacity(900 mA·h/g) and rate performance under alkaline conditions, as well as an ultra-long discharge platform, which contribute to 80% of the total capacity.

关键词： aqueous battery copper sulfide all-pH electrolyte

Comparative Study on Spatial Interpolation Methods for 3D Modeling of Coal and Rock Layers Based on Borehole Data

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Meteorological and Environmental Research 2022年第6期13卷 68-72,77页

作者： Xiang GE liangliang yang Huainan City Construction and Development Planning and Design Institute Co. Ltd.Huainan 232001China

The patial interpolation of borehole data is an important means of stratigraphic structure to construct a three-dimensional model of coal strata,and the reasonable selection of an effective spatial interpolation method will directly affect the accuracy of three-dimensional modeling of the *** select an effective spatial interpolation method and improve the accuracy of 3D modeling of formations,four interpolation methods(the inverse distance weight interpolation algorithm,the local polynomial interpolation algorithm,the radial basis neural network interpolation algorithm and the kriging interpolation algorithm)were compared and *** particular,the methods of interpolation algorithm,interpolation surface,sample test error,and cross-validation error were *** experiment of 13-1 seam coal in the Huainan mining area showed the spatial surface interpolation effect of the radial basis neural network interpolation algorithm(RBF)compared with the inverse distance weight interpolation algorithm(IDW),local polynomial interpolation algorithm(LPI)and kriging *** three interpolation methods have higher accuracy and are more suitable for surface interpolation of coal seams,which is of great significance for improving the accuracy of subsequent 3D modeling of coal seams.

关键词： Drilling Spatial interpolation Coal-rock surface Cross-validation

Analysis of Parameters of Coal Pillar Setting under the Mining Condition of Huge Thick Loose Layer

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Meteorological and Environmental Research 2022年第6期13卷 73-77页

作者： liangliang yang Xiang GE Huainan City Construction and Development Planning and Design Institute Co. Ltd.Huainan 232001China

According to the characteristic of huge thick loose layer in Huainan mining area, based on the measured data, the correlation between the relative parameters of coal pillar setting and the ratio of loose layer thickness to mining depth in Huainan mining area under the mining condition of huge thick loose layer was mainly studied by using regression analysis method, and corresponding mathematical models were established and analyzed. It makes a theoretical supplement for the the analysis and research of mining subsidence rules in Huainan mining area under the condition of huge thick loose layer.

关键词： Huge thick loose layer Mining subsidence Coal pillar setting

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多层衍射光学元件斜入射衍射效率的测量

光学学报 2017年第2期37卷 37-42页

作者：杨亮亮盐城师范学院新能源与电子工程学院江苏盐城224051

为了验证多层衍射光学元件的衍射效率随入射角度的理论变化关系,设计并制作了一个含有多层衍射光学元件(MLDOEs)的光学系统。当次级衍射光通过孔径光阑由探测器接收时,为保证衍射效率的测量精度,提出了一级衍射能量的修正方法。利用搭... 详细信息

为了验证多层衍射光学元件的衍射效率随入射角度的理论变化关系,设计并制作了一个含有多层衍射光学元件(MLDOEs)的光学系统。当次级衍射光通过孔径光阑由探测器接收时,为保证衍射效率的测量精度,提出了一级衍射能量的修正方法。利用搭建的双光路装置,在0°~30.6°范围内对该多层衍射光学元件进行了衍射效率的测量。针对设计波长532nm,选取7个入射角度测量衍射效率,并对测量结果进行了模拟和分析。由于存在一定的加工误差,在不同入射角度状态下实际测量得到的衍射效率比理论分析的结果低,但是实测与理论分析结果均表明,多层衍射光学元件的衍射效率随入射角的增大而下降。

关键词：衍射衍射光学光学测量光学器件多层衍射光学元件衍射效率

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衍射光学元件斜入射衍射效率的测量

红外与激光工程 2018年第1期47卷 207-211页

作者：杨亮亮盐城师范学院新能源与电子工程学院江苏盐城224051

针对衍射光学元件衍射效率测量的双光路实验装置,当次级衍射光通过孔径光阑由探测器接收时,为保证测量精度提出了测量衍射效率的修正公式。针对所研制的含有衍射光学元件的折衍射混合成像光学系统,选取可见光波段中的3个激光波长,当衍... 详细信息

针对衍射光学元件衍射效率测量的双光路实验装置,当次级衍射光通过孔径光阑由探测器接收时,为保证测量精度提出了测量衍射效率的修正公式。针对所研制的含有衍射光学元件的折衍射混合成像光学系统,选取可见光波段中的3个激光波长,当衍射面上入射角度为12°时对该衍射光学元件进行了衍射效率的测量,并对测量结果进行了模拟和分析。由于存在一定的加工误差和斜入射时遮挡效应的影响,实际测得的衍射光学元件的衍射效率比理论计算结果低。根据测量结果拟合曲线,在473~632.8 nm波段范围内的带宽积分平均衍射效率对比理论值存在12.84%的偏差。

关键词：衍射光学光学测量衍射光学元件衍射效率