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Frequency-domain analysis of fluid-structure interaction in aircraft hydraulic pipeline systems: numerical and experimental studies

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2024年第8期25卷 605-617页

作者： Yang DENG Zongxia jiao Yuanzhi XU School of Automation Science and Electrical Engineering Beihang UniversityBeijing 100191China Research Institute for Frontier Science Beihang UniversityBeijing 100191China Key Laboratory of Advanced Airborne Systems Beihang UniversityBeijing 100191China Ningbo Institute of Technology Beihang UniversityNingbo 315800China Tianmushan Laboratory Hangzhou 310023China

The fluid-structure interaction(FSI)in aircraft hydraulic pipeline systems is of great concern because of the damage it *** accurately predict the vibration characteristic of long hydraulic pipelines with curved segments,we studied the frequency-domain modeling and solution method for FSI in these pipeline *** partial differential equations(PDEs)are utilized to model the pipeline FSI,considering both frequency-dependent friction and bending-flexibility *** address the numerical instability encountered by the traditional transfer matrix method(TMM)in solving relatively complex pipelines,an improved TMM is proposed for solving the PDEs in the frequency domain,based on the matrix-stacking strategy and matrix representation of boundary *** proposed FSI model and improved solution method are validated by numerical cases and *** experimental rig of a practical hydraulic system,consisting of an aircraft engine-driven pump,a Z-shaped aero-hydraulic pipeline,and a throttle valve,was constructed for *** magnitude ratio of acceleration to pressure is introduced to evaluate the theoretical and experimental results,which indicate that the proposed model and solution method are effective in practical *** methodology presented in this paper can be used as an efficient approach for the vibrational design of aircraft hydraulic pipeline systems.

关键词： Fluid-structure interaction(FSI) Frequency-domain analysis Aircraft hydraulic pipeline Pipeline vibration Transfer matrix method(TMM)

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Degradation of nitrobenzene-containing wastewater by sequential nanoscale zero valent iron-persulfate process

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Green Energy & Environment 2021年第6期6卷 910-919页

作者： Jingjuan Qiao Weizhou jiao Youzhi Liu Shanxi Province Key Laboratory of Higee-Oriented Chemical Engineering North University of ChinaTaiyuanShanxi030051China

As nitrobenzene(NB)is structurally stable and difficult to degrade due to the presence of an electron withdrawing group(nitro group).The sequential nanoscale zero valent iron-persulfate(NZVI-Na_(2)S_(2)O_(8))process was proposed in this study for the degradation NB-containing *** results showed that the NB degradation efficiency and the total organic carbon removal efficiency in the sequential NZVINa_(2)S_(2)O_(8)process were 100%and 49.25%,respectively,at a NB concentration of 200 mg L^(-1),a NZVI concentration of 0.75 g L^(-1),a Na_(2)S_(2)O_(8)concentration of 26.8 mmol L^(-1),an initial pH of 5,and a reaction time of 30 min,which were higher than those(88.53%and 35.24%,respectively)obtained in the NZVI/Na_(2)S_(2)O_(8)*** radicals(SO_(4)·-)and hydroxyl radicals(·OH)generated in the reaction were identified directly by electron paramagnetic resonance spectroscopy and indirectly by radical capture experiments,and it was shown that both SO_(4)^(·-)and·OH played a major role in the sequential NZVI-Na_(2)S_(2)O_(8)*** possible pathways involved in the reduction of NB to aniline(AN)and the further oxidative degradation of AN were determined by gas chromatography-mass spectrometry.

关键词： Nanoscale zero valent iron Impinging stream-rotating packed bed Sequential NZVI-Na2S2O8process Nitrobenzene Degradation pathways

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ADAPTIVE TRIMMED MEAN AS A LOCATION ESTIMATE

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Journal of Systems Science & Complexity 2012年第5期25卷 973-986页

作者： Siming LI Yong LI jiao JIN Department of Statistics and Financial Mathematics School of Mathematical SciencesKey Laboratory of Mathematics and Complex SystemsMinistry of EducationBeijing Normal University

The trimmed mean is one of the most common estimators of location for symmetrical distributions, whose effect depends on whether the trim rate matches the proportion of contaminated data. Based on the geometric characteristics of the curve of the trimmed variance function, the authors propose two kinds of adaptive trimmed mean algorithms. The accuracy of the estimators is compared with that of other often-used estimates, such as sample mean, trimmed mean, trimean, and median, by means of simulation method. The results show that the accuracy of the adaptive derivative optimization trimmed mean method is close to the optimum performance in case of medium contamination （the contamination rate is less than 50%）. Under high contamination situation （the contamination rate equals 8070）, the performance of the estimates is comparable to that of the median and is superior to other counterparts.

关键词： Adaptive location parameter robust trimmed mean.

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Remaining Useful Life Prediction for a Roller in a Hot Strip Mill Based on Deep Recurrent Neural Networks

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IEEE/CAA Journal of Automatica Sinica 2021年第7期8卷 1345-1354页

作者： Ruihua jiao Kaixiang Peng Jie Dong the Key Laboratory of Knowledge Automation for Industrial Processes of Ministry of Education School of Automation and Electrical EngineeringUniversity of Science and Technology BeijingBeijing 100083 the AVIC Xi’an Aviation Brake Technology Co. Ltd.Xi’an 710065China the Institute of Artificial Intelligence University of Science and Technology BeijingBeijing 100083China the Key Laboratory of Knowledge Automation for Industrial Processes of Ministry of Education School of Automation and Electrical EngineeringUniversity of Science and Technology BeijingBeijing 100083China

Accurate estimation of the remaining useful life(RUL)and health state for rollers is of great significance to hot rolling *** can provide decision support for roller management so as to improve the productivity of the hot rolling *** addition,the RUL prediction for rollers is helpful in transitioning from the current regular maintenance strategy to conditional-based ***,a new method that can extract coarse-grained and fine-grained features from batch data to predict the RUL of the rollers is proposed in this ***,a new deep learning network architecture based on recurrent neural networks that can make full use of the extracted coarsegrained fine-grained features to estimate the heath indicator(HI)is developed,where the HI is able to indicate the health state of the *** that,a state-space model is constructed to describe the HI,and the probabilistic distribution of RUL can be estimated by extrapolating the HI degradation model to a predefined failure ***,application to a hot strip mill is given to verify the effectiveness of the proposed methods using data collected from an industrial site,and the relatively low RMSE and MAE values demonstrate its advantages compared with some other popular deep learning methods.

关键词： Hot strip mill prognostics and health management(PHM) recurrent neural network(RNN) remaining useful life(RUL) roller management.

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Stream cipher designs: a review

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Science China(Information Sciences) 2020年第3期63卷 80-104页

作者： Lin jiao Yonglin HAO Dengguo FENG State Key Laboratory of Cryptology State Key Laboratory of Computer Science Institute of Software Chinese Academy of Sciences

Stream cipher is an important branch of symmetric cryptosystems, which takes obvious advantages in speed and scale of hardware implementation. It is suitable for using in the cases of massive data transfer or resource constraints, and has always been a hot and central research topic in cryptography. With the rapid development of network and communication technology, cipher algorithms play more and more crucial role in information security. Simultaneously, the application environment of cipher algorithms is increasingly complex, which challenges the existing cipher algorithms and calls for novel suitable designs. To accommodate new strict requirements and provide systematic scientific basis for future designs, this paper reviews the development history of stream ciphers, classifies and summarizes the design principles of typical stream ciphers in groups, briefly discusses the advantages and weakness of various stream ciphers in terms of security and implementation. Finally, it tries to foresee the prospective design directions of stream ciphers.

关键词： stream cipher survey lightweight authenticated encryption homomorphic encryption

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Ultimately exposed roof area prediction of bauxite deposit goaf based on macro joint damage

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International Journal of Mining Science and Technology 2020年第5期30卷 699-704页

作者： Lichun Jiang Chao Yang Huazhe jiao School of Civil Engineering and Transportation South China University of TechnologyGuangzhou 510640China Institute of Safety Science and Engineering South China University of TechnologyGuangzhou 510640China School of Civil Engineering Henan Polytechnic UniversityJiaozuo 454003China

The ultimately exposed roof area(UERA)of goaf is crucial to the safety and economics of underground *** prediction models do not consider the mechanical weakness of rock mass and ignore the influence of the joint damage factor,causing a large predicted exposure area with a high roof falling *** work adopted joint damage factor to derive a new UERA prediction *** relationships between the UERA(S)and the span ratio(m),the density(k)and the diameter of fracture(d)were analysed by the new prediction *** results showed that the exposed area S and the span ratio m have a U-shaped curve *** S decreases with the increase of m and then increases when m is beyond *** exposed roof area S is in an inversely proportional power-law relationship with the fracture surface density k,and the curvature of the S-k relationship curve decreases when d=0.5 and k>7,and S is close to *** is a negative correlation between S and the fracture surface diameter d,the curvature of the S-d curve decreases with the increase of d and k,and the variation rate increases first and then decreases with the increase of d;when k=0.5 and d>9,S is close to *** predicted values of the UERA prediction model are 119.3,112.8,and 114.6 m2 with different joint damage parameters,which are slightly smaller than the actual critical exposure area of a roof(S=120 m2).The case study shows that the alternative prediction model is reasonable and acceptable and provides new theoretical support for the underground mining safety of sedimentary bauxite ore.

关键词： Ultimately exposed roof area Bauxite goaf Prediction model Macro joint damage

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Performance of TiC coating prepared by in situ conversion of organic carbon film on 316L bipolar plate

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Journal of Iron and Steel Research International 2023年第8期30卷 1562-1573页

作者： Wen-jiao Zhangl Yan-li Wang School of Chemistry and Chemical Engineering Guangxi UniversityNanning 530004GuangxiChina

TiC coating on 316L stainless steel surface is prepared by molten salt disproportionation reaction by using carbon layer converted from organic carbon solution as carbon *** Raman and morphology characterizations show that the carbon layer and TiC coating are successfully prepared on the surface of 316L stainless steel,the prepared carbon layer and 316L matrix have good adhesion,and the prepared TiC coating is smooth and *** the simulated cathodic environment of the proton exchange membrane fuel cell,the potentiostatic and potentiodynamic polarization measurements show that the TiC coating has smaller and more stable current density fluctuation than the 316L stainless steel substrate,and the electrochemical impedance test lasting for 275 h still shows better stable corrosion resistance than that of the 316L stainless steel ***,in the water contact angle and interface contact resistance tests,the TiC coating consistently maintained better hydrophobicity and lower interface contact resistance values than 316L stainless steel.

关键词： Bipolar plate Proton exchange membrane fuel cell TiC coating Disproportionation reaction Corrosion resistance

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Design study of APS-U-type hybrid-MBA lattice for mid-energy DLSR

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Nuclear Science and Techniques 2021年第7期32卷 46-54页

作者： Yu Zhao Yi jiao Sheng Wang Institute of High Energy Physics(IHEP) Chinese Academy of Sciences(CAS)Beijing 100049China University of Chinese Academy of Sciences(UCAS) Beijing 100049China Spallation Neutron Source Science Center(SNSSC) Dongguan 523803China

In recent years,a new generation of storage ring-based light sources,known as diffraction-limited storage rings(DLSRs),whose emittance approaches the diffraction limit for the range of X-ray wavelengths of interest to the scientific community,has garnered significant attention *** have begun to design and build *** various DLSR proposals,the hybrid multibend achromat(H-MBA)lattice enables sextupole strengths to be maintained at a reasonable level when minimizing the emittance;hence,it has been adopted in many DLSR *** on the H-7BA lattice,the design of the Advanced Photon Source Upgrade Project(APS-U)can effectively reduce emittance by replacing six quadrupoles with ***,we discuss the feasibility of designing an APS-U-type H-MBA lattice for the Southern Advanced Photon Source,a mid-energy DLSR light source with ultralow emittance that has been proposed to be built adjacent to the China Spallation Neutron *** linear and nonlinear dynamics are optimized to obtain a detailed design of this type of *** emittance is minimized,while a sufficiently large dynamic aperture(DA)and momentum acceptance(MA)are maintained.A design comprising 36 APS-U type H-7BAs,with an energy of 3 GeV and a circumference of 972 m,is *** horizontal natural emittance is 20 pm·rad,with a horizontal DA of 5.8 mm,a vertical DA of 4.5 mm,and an MA of 4%,as well as a long longitudinal damping time of 120 ***,a few modifications are performed based on the APS-U-type lattice to reduce the maximum value of damping time from 120 to 44 ms while maintaining other performance parameters at the same level.

关键词： Southern advanced photon source(SAPS) Diffraction-limited storage ring(DLSR) Hybrid multibend achromat(H-MBA) Advanced photon source upgrade project(APS-U) Lattice design

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Multi-objective energy management for PHEV using Pontryagin's minimum principle and particle swarm optimization online

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Science China(Information Sciences) 2021年第1期64卷 263-265页

作者： Yuying WANG Xiaohong jiao Institute of Electric Engineering Yanshan University

Dear editor,Plug-in hybrid electric vehicles (PHEVs),which can be charged through an external power grid,have been regarded as one of the research areas for the developing methods to reduce petroleum demand and exhaust *** management strategies (EMSs) are crucial for reducing the energy consumption for PHEVs because the power demands during the driving cycle are usually provided by multiple energy *** addition,PHEVs are often equipped with high-cost batteries,which need to be charged and discharged *** indicates that,to achieve the economic feasibility of PHEVs,battery health cannot be ignored with respect to energy management [1].

关键词： plug-in hybrid electric vehicle energy management strategy multi-objective Pontryagin's minimum principle particle swarm optimization

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Development Strategies in Transition Metal Borides for Electrochemical Water Splitting

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Energy & Environmental Materials 2022年第2期5卷 470-485页

作者： Yihang Yao Zhaoyuan Zhang Lifang jiao Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education) Renewable Energy Conversion and Storage Center(ReCast)College of ChemistryNankai UniversityTianjin 300071China

Electrochemical water splitting is a feasible method for producing environmental benignity energy of hydrogen,while high price and low availability on the earth of noble electrocatalysts constrain their global-scale *** metal borides(TMBs)have displayed unique metalloid characteristic and outstanding performance for oxygen evolution reaction(OER)and hydrogen evolution reaction(HER)in the last few ***,recent developments of the TMBs for HER and OER are ***,the impact factors and relevant evaluation of electrocatalytic performance are described,that is,overpotential,Tafel slope and exchange current density,stability,faradaic efficiency,turnover frequency,mass and specific ***,the optimization strategies of borides are emphasized,which principally include coupling with effective substrates,elemental doping,phase modification,interfacial engineering,and morphology ***,in order to reach the goal of application,the remaining challenges and perspectives are given to point out a direction for enhancing the performance of borides.

关键词： borides electrocatalysts hydrogen evolution reaction oxygen evolution reaction

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