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Modified ADM1 for modeling free ammonia inhibition in anaerobic acidogenic fermentation with high-solid sludge

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Journal of Environmental Sciences 2017年第2期29卷 58-65页

作者： Jie Bai He Liu Bo Yin Huijun Ma xinchun chen School of Environmental and Civil Engineering Jiangnan UniversityWuxi 214122China

Anaerobic acidogenic fermentation with high-solid sludge is a promising method for volatile fatty acid（VFA） production to realize resource recovery. In this study, to model inhibition by free ammonia in high-solid sludge fermentation, the anaerobic digestion model No. 1（ADM1） was modified to simulate the VFA generation in batch, semicontinuous and full scale sludge. The ADM1 was operated on the platform AQUASIM *** kinds of inhibition forms, e.g., simple inhibition, Monod and non-inhibition forms,were integrated into the ADM1 and tested with the real experimental data for batch and semi-continuous fermentation, respectively. The improved particle swarm optimization technique was used for kinetic parameter estimation using the software MATLAB 7.0. In the modified ADM1, the Ksof acetate is 0.025, the km,acis 12.51, and the KI_NH3is 0.02,respectively. The results showed that the simple inhibition model could simulate the VFA generation accurately while the Monod model was the better inhibition kinetics form in semi-continuous fermentation at pH 10.0. Finally, the modified ADM1 could successfully describe the VFA generation and ammonia accumulation in a 30 m^3full-scale sludge fermentation reactor, indicating that the developed model can be applicable in high-solid sludge anaerobic fermentation.

关键词： High-solid sludge ADM1 Semi-continuous Full scale Free ammonia inhibition

Effect of the Cutter Parameters and Machining Parameters on the Interference in Gear Slicing

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Chinese Journal of Mechanical Engineering 2013年第6期26卷 1118-1126页

作者： chen xinchun LI Jia LOU Benchao SHI Jiang YANG Qijun Key Laboratory of Mechanism and Equipment Design of Ministry of Education Tianjin University

Current researches have not yet found the effect law of the cutter parameters and machining parameters on the interference in gear slicing, the interference between the cutter and machined gear often happens because the appropriate cutter parameters and machining parameters cannot be set, which reduces the gear machining accuracy. The relative position between the major flank face and edge-sweeping surface, distribution law of the interference area in forming process of edge-sweeping surface, and effect law of relative positions among edge-sweeping surfaces on the interference are studied by graphical analysis. The effect law of the cutter parameters and machining parameters on the interference is found. The effect law shows that the interference in gear slicing can be controlled when the relief angle measured on the top edge and feed of every rotation are chosen respectively larger than 9~ and smaller than 0.15 mrn/r. An internal helical gear is sliced with the spur slice cutter and the cutter parameters and machining parameters are set based on above the effect law. The machined gear is measured in Gear Measuring Center and the detection result shows that the comprehensive accuracy reaches GB/T Class 7, where some reach GB/T Class 6. The result can meet the gear machining accuracy requirement and shows that the effect law found is valid. The problem of the interference in gear slicing is solved and the gear machining accuracy can be improved.

关键词： gear slicing interference edge-sweeping surface graphical analysis

Modified graphene as novel lubricating additive with high dispersion stability in oil

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Friction 2021年第1期9卷 143-154页

作者： Pu WU xinchun chen chenhui ZHANG Jiping ZHANG Jianbin LUO Jiyang ZHANG State Key Laboratory of Tribology Tsinghua UniversityBeijing 100084China Tianjin Research Institute for Advanced Equipment Tsinghua UniversityTianjin 300300China Beijing Key Laboratory of Long-life Technology of Precise Rotation and Transmission Mechanisms Beijing Institute of Control EngineeringBeijing 100094China

Graphene is a promising material as a lubricant additive for reducing friction and ***,a dispersing method which combines chemical modification of graphene by octadecylamine and dicyclohexylcarbodiimide with a kind of effective dispersant has been successfully developed to achieve the remarkable dispersion stability of graphene in base *** stable dispersion time of modified graphene(0.5 wt%)with dispersant(1 wt%)in PAO-6 could be up to about 120 days,which was the longest time reported so *** the same time,the lubricant exhibits a significant improvement of tribological performance for a steel ball to plate tribo-system with a normal load of 2 *** coefficient of friction between sliding surfaces was~0.10 and the depth of wear track on plate was~21 nm,which decreased by about 44%and 90%when compared to pure PAO-6,***,the analysis of the lubricating mechanisms in regard to the sliding-induced formation of nanostructured tribo-film has been contacted by using Raman spectra and TEM.

关键词： modified graphene dispersity lubricant additives tribo-film

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水槽几何精度复合检测系统

工程机械 2024年第8期55卷 34-37,I0012页

作者：毕梦雪闫乃晴陈新春江苏徐工工程机械研究院有限公司 221004

水槽的同轴度、圆度、平行度等几何精度直接影响泵送系统装配后的同轴度质量,其制造精度超差会致使活塞偏磨,不仅会增加售后维修成本,甚至会导致发生无偿更换泵送系统、退车等情况。针对水槽多个几何精度无法复合检测的技术难题,开发水... 详细信息

水槽的同轴度、圆度、平行度等几何精度直接影响泵送系统装配后的同轴度质量,其制造精度超差会致使活塞偏磨,不仅会增加售后维修成本,甚至会导致发生无偿更换泵送系统、退车等情况。针对水槽多个几何精度无法复合检测的技术难题,开发水槽几何精度复合检测系统及方法,通过“三支腿+电磁表座”实现检测装置的精准快速定位,通过“电机+同步带组件+圆柱导轨”实现检测单元数据自动化采集,结合同轴度、圆度、平行度计算方法,解决混凝土泵送系统水槽几何精度无法复合检测难题,实现检测过程自动化,显著提升检测效率。

关键词：组态软件水槽几何精度复合检测

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钻桅导轨直线度与平面度复合检测技术研究

工程机械 2024年第6期55卷 102-105,I0022页

作者：闫乃晴毕梦雪陈新春江苏徐工工程机械研究院有限公司 221004

钻桅导轨直线度与平面度直接影响旋挖钻机动力头工作平稳性,高直线度与平面度可提升设备的使用性能,并在降低整机能耗上做出贡献。为提高钻桅导轨直线度与平面度的检测水平,克服现有检测方法的局限性,提出一种钻桅导轨直线度与平面度复... 详细信息

钻桅导轨直线度与平面度直接影响旋挖钻机动力头工作平稳性,高直线度与平面度可提升设备的使用性能,并在降低整机能耗上做出贡献。为提高钻桅导轨直线度与平面度的检测水平,克服现有检测方法的局限性,提出一种钻桅导轨直线度与平面度复合检测方法。根据钻桅导轨特点,给出测量原理与测量系统总体方案,建立直线度与平面度测量数学模型。采用所设计测量装置与激光跟踪仪进行测量与比较,证明所设计测量装置测量误差为0.214 mm,小于钻桅导轨直线度与平面度5 mm要求的十分之一,满足检测要求,证明该检测系统是有效的。该研究可为钻桅导轨直线度与平面度检测提供技术支持。

关键词：钻桅导轨直线度与平面度激光测量

Ion energy-induced nanoclustering structure in a-C:H film for achieving robust superlubricity in vacuum

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Friction 2022年第12期10卷 1967-1984页

作者： Qingyuan YU xinchun chen chenhui ZHANG chenxi ZHANG Wenli DENG Yinhui WANG Jianxun XU Wei QI State Key Laboratory of Tribology Tsinghua UniversityBeijing 100084China

Hydrogenated amorphous carbon(a-C:H)films are capable of providing excellent superlubricating properties,which have great potential serving as self-lubricating protective layer for mechanical systems in extreme working ***,it is still a huge challenge to develop a-C:H films capable of achieving robust superlubricity state in *** main obstacle derives from the lack of knowledge on the influencing mechanism of deposition parameters on the films bonding structure and its relation to their self-lubrication *** at finding the optimized deposition energy and revealing its influencing mechanism on superlubricity,a series of highly-hydrogenated a-C:H films were synthesized with appropriate ion energy,and systematic tribological experiments and structural characterization were *** results highlight the pivotal role of ion energy on film composition,nanoclustering structure,and bonding state,which determine mechanical properties of highly-hydrogenated a-C:H films and surface passivation ability and hence their superlubricity performance in *** optimized superlubricity performance with the lowest friction coefficient of 0.006 coupled with the lowest wear rate emerges when the carbon ion energy is just beyond the penetration threshold of *** combined growth process of surface chemisorption and subsurface implantation is the key for a-C:H films to acquire stiff nanoclustering network and high volume of hydrogen incorporation,which enables a robust near-frictionless sliding *** findings can provide a guidance towards a more effective manipulation of self-lubricating a-C:H films for space application.

关键词： hydrogenated amorphous carbon(a-C:H) superlubricity ion energy nanoclustering bonding structure mechanical properties

Influence of tribofilm on superlubricity of highly-hydrogenated amorphous carbon films in inert gaseous environments

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Science China(Technological Sciences) 2016年第12期59卷 1795-1803页

作者： LIU ShuWei ZHANG chenHui OSMAN Eryilmaz chen xinchun MA TianBao HU YanZhong LUO JianBin ALI Erdemir State Key Laboratory of Tribology Tsinghua University Energy Systems Division Argonne National Laboratory

In this study,we mainly focus on the structural morphology and inter-atomic bonding state of tribofilms resulting from a highly-hydrogenated amorphous carbon(a-C:H) film in order to ascertain the underlying mechanisms for its superlubric behavior(i.e.,less than 0.01 friction coefficient).Specifically,we achieved superlubricity(i.e.,friction coefficients of down to 0.003) with this film in dry nitrogen and argon atmospheres especially when the tribo-pair is made of an a-C:H coated Si disk sliding against an a-C:H coated steel ball,while the a-C:H coated disk against uncoated ball does not provide *** also found that the state of superlubricity is more stable in argon than in nitrogen and the formation of a smooth and uniformly-thick carbonaceous tribofilm appears to be one of the key factors for the realization of such ***,the interfacial morphology of sliding test pairs and the atomic-scale bond structure of the carbon-based tribofilms also play an important role in the observed superlubric behavior of a-C:H *** Raman spectroscopy and high resolution transmission electron microscopy,we have compared the structural differences of the tribofilms produced on bare and a-C:H coated steel *** the a-C:H coated ball as mating material which provided superlow friction in argon,structural morphology of the tribofilm was similar or comparable to that of the original a-C:H coating;while for the bare steel ball,the sp^2-bonded C fraction in the tribofilm increased and a fingerprint-like nanocrystalline structure was detected by high resolution transmission electron microscopy(HRTEM).We also calculated the shear stresses for different tribofilms,and established a relationship between the magnitude of the shear stresses and the extent of sp^3-sp^2 phase transformation.

关键词： diamond-like carbon(DLC) films superlubricty tribofilm high resolution transmission electron microscopy(HRTEM) phase transformation

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硅烷偶联剂对水性环氧涂层耐腐蚀性能的影响

工程建设 2024年第2期56卷 36-40页

作者：朱丹丹陈新春来福琨杨桓烟台大学土木工程学院山东烟台264003 新疆建筑科学研究院有限公司新疆乌鲁木齐830054

金属结构失效往往是因为金属腐蚀,因此提高防护性涂层的耐腐蚀的性能、延长金属结构寿命非常重要。对乙烯基硅烷偶联剂、氨基硅烷偶联剂以及环氧基硅烷偶联剂这3种不同类型硅烷偶联剂对水性环氧涂层的覆盖能力以及耐腐蚀性能的影响进行... 详细信息

金属结构失效往往是因为金属腐蚀,因此提高防护性涂层的耐腐蚀的性能、延长金属结构寿命非常重要。对乙烯基硅烷偶联剂、氨基硅烷偶联剂以及环氧基硅烷偶联剂这3种不同类型硅烷偶联剂对水性环氧涂层的覆盖能力以及耐腐蚀性能的影响进行研究,并确定防腐蚀性能最优的硅烷偶联剂的类型以及用量。结果表明:当水性环氧涂料中加入硅烷偶联剂后涂层的覆盖能力会变好,通过耐化学介质测试和电化学腐蚀电流密度测试结果表明,3种硅烷偶联剂较空白组耐腐蚀性能提升效果最好的掺量均为1%,其中添加1%氨基硅烷偶联剂在60 d后腐蚀电流密度为0.004 9μA/cm^(2),显著低于其他两类硅烷偶联剂。本文内容可为水性环氧树脂及其他水性防腐涂料提高其防腐性能提供参考。

关键词：硅烷偶联剂水性环氧涂料腐蚀电流密度防腐蚀

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基于增强现实技术的钻桅导轨直线度质量控制系统

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工程机械 2024年第6期55卷 53-56,I0020页

作者：毕梦雪闫乃晴陈新春姜鹏江苏徐工工程机械研究院有限公司 221004 徐州徐工基础工程机械有限公司

钻桅导轨直线度超差直接影响着钻杆成孔方向及旋挖钻机的使用性能。针对钻桅导轨直线度质量无法控制的行业技术难题,开发基于增强现实技术的钻桅导轨直线度质量控制系统。利用钻桅导轨直线度检测设备,获取钻桅导轨检测过程数据,通过矫... 详细信息

钻桅导轨直线度超差直接影响着钻杆成孔方向及旋挖钻机的使用性能。针对钻桅导轨直线度质量无法控制的行业技术难题,开发基于增强现实技术的钻桅导轨直线度质量控制系统。利用钻桅导轨直线度检测设备,获取钻桅导轨检测过程数据,通过矫形方法计算钻桅矫形参数,固化至组态软件。集成温度传感器、5G与AR增强现实技术,开发“5G+AR”可视化系统,将矫形信息传输至工人,实现矫形温度实时感知和控制,打破钻桅检测和矫形过程依靠人工经验现状,为钻桅质量控制提供了技术支持。

关键词：组态软件钻桅直线度质量控制