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Iterative HOEO fusion strategy:a promising tool for enhancing bearing fault feature

Frontiers of Mechanical Engineering 2023年第1期18卷 253-273页

作者： xingxing JIANG Demin PENG Jianfeng GUO Jie LIU Changqing shen Zhongkui ZHU School of Rail Transportation Soochow UniversitySuzhou 215131China China Academy of Railway Sciences Co.Ltd. Beijing 100094China School of Civil and Hydraulic Engineering Huazhong University of Science and TechnologyWuhan 430074China

As parameter independent yet simple techniques,the energy operator(EO)and its variants have received considerable attention in the field of bearing fault feature ***,the performances of these improved EO techniques are subjected to the limited number of EOs,and they cannot reflect the non-linearity of the machinery dynamic systems and affect the noise *** a result,the fault-related transients strengthened by these improved EO techniques are still subject to contamination of strong *** address these issues,this paper presents a novel EO fusion strategy for enhancing the bearing fault feature nonlinearly and ***,the proposed strategy is conducted through the following three ***,a multi-dimensional information matrix(MDIM)is constructed by performing the higher order energy operator(HOEO)on the analysis signal *** is regarded as the fusion source of the proposed strategy with the properties of improving the signal-to-interference ratio and suppressing the noise in the low-frequency ***,an enhanced manifold learning algorithm is performed on the normalized MDIM to extract the intrinsic manifolds correlated with the fault-related ***,the intrinsic manifolds are weighted to recover the fault-related *** studies and experimental verifications confirm that the proposed strategy is more effective for enhancing the bearing fault feature than the existing methods,including HOEOs,the weighting HOEO fusion,the fast Kurtogram,and the empirical mode decomposition.

关键词： higher order energy operator fault diagnosis manifold learning rolling element bearing information fusion

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广西生态环保科技帮扶分析

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中国资源综合利用 2023年第5期41卷 149-151页

作者：谢佳员欧芳黄昊申星星韦柳春曹胜平广西壮族自治区环境保护科学研究院南宁530000

科技是解决环境问题的利器。本文结合国家生态环保科技帮扶工作现状,梳理广西开展生态环保科技帮扶工作的实践,分析广西生态环保科技帮扶工作成效,从而打赢污染防治攻坚战,服务经济高质量发展。一是服务基层需求,助力企业解决环境治理难... 详细信息

科技是解决环境问题的利器。本文结合国家生态环保科技帮扶工作现状,梳理广西开展生态环保科技帮扶工作的实践,分析广西生态环保科技帮扶工作成效,从而打赢污染防治攻坚战,服务经济高质量发展。一是服务基层需求,助力企业解决环境治理难题;二是汇集科技力量,深入帮扶各市污染防治;三是推动成果应用转化,助力企业绿色高质量发展;四是建设综合服务平台,以大数据高效服务科技帮扶。

关键词：科技帮扶污染防治生态环保

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浅析广西生物多样性现状、存在问题及对策

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工业微生物 2023年第2期53卷 129-131页

作者：申星星曹胜平温红芳谢佳员黄昊欧芳广西壮族自治区环境保护科学研究院广西南宁530000

广西独特的生态环境孕育出了丰富的动物和植物种类,生物多样性居全国第三位,在我国生态安全和生态文明建设战略格局中处于重要地位。为了保护生物多样性和维持物种种族存续,文章简要分析了广西生物多样性现状及其存在的问题,并提出了相... 详细信息

广西独特的生态环境孕育出了丰富的动物和植物种类,生物多样性居全国第三位,在我国生态安全和生态文明建设战略格局中处于重要地位。为了保护生物多样性和维持物种种族存续,文章简要分析了广西生物多样性现状及其存在的问题,并提出了相应的解决策略。

关键词：生物多样性生态系统生态保护

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粘胶/超高分子聚乙烯混纺纱上浆工艺研究

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江苏工程职业技术学院学报 2016年第4期16卷 6-9页

作者：陈志华沈星星周梦娴马小飞眭建华江苏工程职业技术学院南通226007 南通市新型纤维材料重点实验室南通226007 苏州大学纺织与服装工程学院苏州215021 江苏省纺织丝绸产业技术研究所南通226007

为开发粘胶/超高分子聚乙烯混纺纱线机织面料,重点研究混纺纱线的上浆工艺,以线密度为18 tex,3种混纺纱线(混纺比分别为50/50、65/35、90/10)为材料,在GA392型全电子式单纱浆纱机上,建立三因素三水平正交试验,测试得浆率、增强率、毛羽... 详细信息

为开发粘胶/超高分子聚乙烯混纺纱线机织面料,重点研究混纺纱线的上浆工艺,以线密度为18 tex,3种混纺纱线(混纺比分别为50/50、65/35、90/10)为材料,在GA392型全电子式单纱浆纱机上,建立三因素三水平正交试验,测试得浆率、增强率、毛羽降低率值,采用正交试验,结合直观分析及方差分析方法,探讨优化上浆工艺。结果表明,混纺比分别为50/50、65/35、90/10的粘胶/超高分子聚乙烯混纺纱在淀粉浓度、浆纱速度、烘燥温度上的优化上浆工艺方案分别为:8%、30 m/min、60℃;8%、35 m/min、50℃;8%、30 m/min、50℃。

关键词：超高分子聚乙烯混纺纱上浆工艺正交试验

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固体添加剂2-(噻吩-2-亚甲基)丙二腈的合成及其有机光伏性能

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河北科技师范学院学报 2024年第2期38卷 59-65页

作者：沈星星罗丹何源杨述谢家平侯文龙韩璐河北科技师范学院化学工程学院河北秦皇岛066600 南昌大学化学学院河北科技师范学院分析测试中心

为了提高有机光伏器件性能,合成了一种结构简单、成本低的固体添加剂2-(噻吩-2-亚甲基)丙二腈(SAT),并测试了其对非富勒烯有机太阳能电池性能的影响。测试结果显示,优化后的共混薄膜的紫外可见吸收光谱红移了14 nm,荧光强度显著降低。而... 详细信息

为了提高有机光伏器件性能,合成了一种结构简单、成本低的固体添加剂2-(噻吩-2-亚甲基)丙二腈(SAT),并测试了其对非富勒烯有机太阳能电池性能的影响。测试结果显示,优化后的共混薄膜的紫外可见吸收光谱红移了14 nm,荧光强度显著降低。而且,薄膜的结晶度更高,形成的相分离形貌更加均匀,分子堆叠更加有序,有利于激子分离和电荷传输。与未使用SAT优化的器件相比,当SAT的质量浓度为5 mg/mL时,开路电压由0.85 V降低至0.83 V,短路电流由21.15 mA/cm^(2)提升至23.58 mA/cm^(2),填充因子由65.70%提升至71.17%,能量转换效率由11.89%提升至13.90%。

关键词：有机太阳能电池固体添加剂 2-(噻吩-2-亚甲基)丙二腈光伏性能

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Rheological properties and viscosity reduction of South China Sea crude oil

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Journal of Energy Chemistry 2018年第4期27卷 1198-1207页

作者： Hui Sun xingxing Lei Benxian shen Huiran Zhang Jichang Liu Gengnan Li Di Wu Petroleum Processing Research Center East China University of Science and TechnologyShanghai 200237China The Cene and Linda Voiland School of Chemical Engineering and Bioengineering Washington State UniversityPullmanWA 99163United States Department of Chemistry Washington State UniversityPullmanWA 99163United States Materials Science and Engineering Washington State UniversityPullmanWA 99163United States

The rheological properties of South China Sea （SCS） crude oil were studied. A group of synthetic long-chain polymers, including octadecyl acrylate-maleic anhydride bidodecyl amide copolymer （VR-D）, octadecyl acrylate-maleic anhydride bioctadecyl amide copolymer （VR-O） and octadecyl acrylate-maleic anhydride phenly amide copolymer （VR-A）, were employed to serve as viscosity reducers （VRs）. Their performance was evaluated by both experimental and computational methodologies. The results suggest that the SCS crude oil has low wax content yet high resin and asphaltene contents, which lead to high viscosity through formation of association structures. Additionally, the SCS crude oil appears to be a pseudoplastic fluid showing linear shear stress-shear rate dependence at low temperature. Interestingly, it gradually evolves into a Newtonian fluid with exponential relationship between shear stress and shear rate at higher temperature. Synthetic VRs demonstrate desirable and effective performance on improvement of the rheological properties of SCS crude oil. Upon the introduction of 1000ppm VR-O, which is synthesized by using octadecylamine in the aminolysis reaction, the viscosity of SCS crude oil is decreased by 44.2% at 15 ℃ and 40.2% at 40℃. The computational study suggests significant energy level increase and shear stress decrease for VR-containing crude oil systems.

关键词： South China Sea crude oil Characterization Rheological properties Viscosity reduction

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The reinforcement learning method for occupant behavior in building control:A review

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Energy and Built Environment 2021年第2期2卷 137-148页

作者： Mengjie Han Jing Zhao xingxing Zhang Jingchun shen Yu Li School of Technology and Business Studies Dalarna UniversityFalun 79188Sweden Leisure Management College Xi’an Eurasia UniversityYanta DistrictXi’anChina Luxembourg Institute of Science and Technology LIST 5Avenue des Hauts-FourneauxL-4362 Esch-sur-AlzetteLuxembourg

Occupant behavior in buildings has been considered the major source of uncertainty for assessing energy con-sumption and building *** frameworks are usually built to accomplish a certain task,but the stochasticity of the occupant makes it difficult to apply that experience to a similar but distinct *** complex and dynamic environments,the development of smart devices and computing power makes intelligent control methods for occupant behaviors more *** is expected that they will make a substantial contribution to reducing global energy *** these control techniques,the reinforcement learning(RL)method seems distinctive and *** success of the reinforcement learning method in many artificial intelligence applications has given an explicit indication of how this method might be used to model and adjust occupant behavior in building *** algorithms complement each other and guarantee the quality of the ***,the examination of occupant behavior based on reinforcement learning methodologies is not well *** way that occupant interacts with the RL agent is still *** study briefly reviews the empirical applications using reinforcement learning,how they have contributed to shaping the modeling paradigms and how they might suggest a future research direction.

关键词： Reinforcement learning Occupant behavior Energy efficiency Building control Smart building

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姜辛温肺汤联合磁热疗法治疗感染后咳嗽(寒饮伏肺证)的临床观察

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中国中医急症 2024年第4期33卷 637-640页

作者：熊玉玲许洁翎李惠惠沈星星王国书广州中医药大学惠州医院惠州市中医医院广东惠州516000 广州中医药大学广东广州510405

目的观察姜辛温肺汤联合磁热疗法应用于感染后咳嗽(寒饮伏肺证)患者的临床疗效。方法选取感染后咳嗽(寒饮伏肺证)患者120例,使用随机数字表方法随机分为阿斯美组、姜辛温肺汤组、联合组各40例。阿斯美组给予阿斯美治疗,姜辛温肺汤组采... 详细信息

目的观察姜辛温肺汤联合磁热疗法应用于感染后咳嗽(寒饮伏肺证)患者的临床疗效。方法选取感染后咳嗽(寒饮伏肺证)患者120例,使用随机数字表方法随机分为阿斯美组、姜辛温肺汤组、联合组各40例。阿斯美组给予阿斯美治疗,姜辛温肺汤组采用姜辛温肺汤进行治疗,联合组采用姜辛温肺汤加减联合磁热治疗,比较各组治疗效果、治疗前后中医证候积分、咳嗽平均起效时间、治疗前后外周血白细胞介素-8(IL-8)水平及不良反应。结果联合组总有效率为92.50%,明显高于阿斯美组的82.50%(P0.05)。治疗后,联合组较其他两组中医证候积分及外周血IL-8水平下降更多(P<0.05),咳嗽平均起效时间更快(P<0.05),且不良反应较少。结论姜辛温肺汤联合磁热疗法治疗较单纯西医治疗及单纯中药内服治疗感染后咳嗽(寒饮伏肺证)患者疗效更好。

关键词：感染后咳嗽姜辛温肺汤磁热疗法寒饮伏肺疗效

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Synchronous chirp mode extraction: A promising tool for fault diagnosis of rolling element bearings under varying speed conditions

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Chinese Journal of Aeronautics 2022年第1期35卷 348-364页

作者： xingxing JIANG Qiang HUANG Changqing shen Qian WANG Kun XU Jie LIU Juanjuan SHI Zhongkui ZHU School of Rail Transportation Soochow UniversitySuzhou 215131China Wenzheng College of Soochow University Suzhou 215104China College of Energy and Power Engineering Nanjing University of Aeronautics and AstronauticsNanjing 210016China Sclool of Hydropower and Infonnation Engineering Huazhong University of Science and TechnologyWuhan 430074China

As critical components in modern aerospace productions,rolling element bearings(REBs)generally work under varying speed conditions,which brings great challenges to their operating health *** novel time–frequency decomposition(TFD)algorithms are established recently to extract nonlinear features from the non-stationary signals effectively,which are promising for realizing fault diagnosis of REBs under varying speed ***,numerous personal experiences must be incorporated and the anti-noise performance of these methods needs to be further *** these issues,a synchronous chirp mode extraction(SCME)-based REB fault diagnosis method is proposed for the health monitoring of REBs under varying speed conditions in this *** mainly consists of following two parts.(a)The shaft rotational frequency(SRF)is initially estimated from the low-frequency band of the vibration ***,an adaptive refining strategy is incorporated to obtain a suitable bandwidth parameter.(b)A cycle-one-step estimation frame is constructed to extract synchronous modes from the envelope waveform of the vibration ***,a synchronous mode spectrum(SMS)is generated using the information of the extracted synchronous modes,which is a novel REBs fault diagnosis technique with tacholess and *** contrast to the current TFD algorithms,the proposed method needs fewer input parameters and owns a well anti-noise performance because there is no iterative optimization in the procedure of construction of *** a result,the health conditions of REBs are evaluated by detecting the exhibited features in the *** and experiments are conducted to validate the effectiveness of the proposed method in terms of REB fault *** results demonstrate that the proposed method outperforms the current TFD algorithm and the conventional order tracking technique for fault diagnosis of REB under varying speed conditions.

关键词： Envelope analysis Fault diagnosis Order tracking Rolling element bearing Varying speed

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Performance analysis of frequency‑mixed PPP‑RTK using low‑cost GNSS chipset with different antenna configurations

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Satellite Navigation 2023年第3期4卷 54-71页

作者： xingxing Li Hailong Gou Xin Li Zhiheng shen Hongbo Lyu Yuxuan Zhou Hao Wang Qian Zhang School of Geodesy and Geomatics Wuhan University129 Luoyu RoadWuhan 430079HubeiChina Hubei Luojia Laboratory Wuhan University129 Luoyu RoadWuhan 430079HubeiChina Tianjin Navigation Instrument Research Institute 268 Dingzigu 1St RoadTianjin 300130China Meituan 6 Wangjing East RoadChaoyang DistrictBeijingChina

Low-cost Global Navigation Satellite System(GNSS)devices offer a cost-effective alternative to traditional GNSS systems,making GNSS technology accessible to a wider range of ***,low-cost GNSS devices often face the challenges in effectively capturing and tracking satellite signals,which leads to losing the observations at certain ***,the observation peculiarities of low-cost devices are in contradistinction to those of traditional geodetic GNSS *** this contribution,a low-cost PPP-RTK model that considers the unique characteristics of different types of measurements is developed and its performance is fully evaluated with u-blox F9P receivers equipped with three distinctive antenna configurations:vertical dipole,microstrip patch,and helix *** static and kinematic experiments in different scenarios are conducted to verify the effectiveness of the proposed *** results indicate that the mixed-frequency PPP-RTK model outperforms the traditional dual-frequency one with higher positioning accuracy and fixing *** the three low-cost antennas tested,the vertical dipole antenna demonstrates the best performance under static conditions and shows a comparable performance as geodetic antennas with a positioning accuracy of 0.02 m,0.01 m and 0.07 m in the east,north,and up components,*** low-speed kinematic scenarios,the helix antenna outperforms the other two with a positioning accuracy of(0.07 m,0.07 m,0.34 m).Furthermore,the helix antenna is also proved to be the best choice for vehicle navigation with an ambiguity fixing rate of over 95%and a positioning accuracy of(0.13 m,0.14 m,0.36 m).

关键词： PPP-RTK Low-cost device Rapid ambiguity resolution Centimeter-level positioning accuracy Performance assessment

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