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浙江大学学报（英文版）（A辑：应用物理和工程）
浙江大学学报（英文版）（A辑：应用物理和工程）

杨卫

月刊

1673-565X

jzus_zzy@zju.edu.cn

0571-87952783；87952331

310027

杭州浙大路38号浙大学报英文版编辑部

浙江大学学报（英文版）（A辑：应用物理和工程）/Journal Journal of Zhejiang University Science A：Applied Physics & EngineeringCSCDCSTPCD北大核心EISCI
查看更多>>JZUS-A:《浙大学报(英文版)(A辑：应用物理和工程)》Journal of Zhejiang University SCIENCE A focuses on Applied Physics & Mathematics, Civil Engineering, Environmental, Energy, Materials, Chemical Engineering, Mechanical, EEE, Computer & Information Sciences. JZUS-A has been indexed & abstracted by Science Citation Index-Expanded (SCI-E), Ei Compendex, CA, SA, AJ, ZM, CSA (AHTD/ AI/ AP/ ASF/ CDCD/ CE/ CI/ CIS/ Corr/ C-WC/ EC/ EMA/ MBF/ ESPM/ MD/ MG/ OA/ OT/ SS/ WR). JZUS-A welcomes the high-quality research articles, reviews, science letters, report, news & views etc from all over the world, and also welcomes your online submission at or by to get more information about JZUS-A, thanks.
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    A learning-based control pipeline for generic motor skills for quadruped robots

    Yecheng SHAOYongbin JINZhilong HUANGHongtao WANG...
    443-454页
    查看更多>>摘要：Performing diverse motor skills with a universal controller has been a longstanding challenge for legged robots.While motion imitation-based reinforcement learning(RL)has shown remarkable performance in reproducing designed motor skills,the trained controller is only suitable for one specific type of motion.Motion synthesis has been well developed to generate a variety of different motions for character animation,but those motions only contain kinematic information and cannot be used for control.In this study,we introduce a control pipeline combining motion synthesis and motion imitation-based RL for generic motor skills.We design an animation state machine to synthesize motion from various sources and feed the generated kinematic reference trajectory to the RL controller as part of the input.With the proposed method,we show that a single policy is able to learn various motor skills simultaneously.Further,we notice the ability of the policy to uncover the correlations lurking behind the reference motions to improve control performance.We analyze this ability based on the predictability of the reference trajectory and use the quantified measurements to optimize the design of the controller.To demonstrate the effectiveness of our method,we deploy the trained policy on hardware and,with a single control policy,the quadruped robot can perform various learned skills,including automatic gait transitions,high kick,and forward jump.
      原文链接:
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    Geometrical transition properties of vortex cavitation and associated flow-choking characteristics in poppet valves

    Liang LUZhongdong LIANGYuming LIUZhipeng WANG...
    455-469,中插1-中插4页
    查看更多>>摘要：Poppet valves have become increasingly significant in ensuring precise digital flow rate and pressure control in hydraulic systems,necessitating a more profound understanding of the geometrical properties of cavitation in them,as well as associated flow-choking conditions.Through a comparative analysis with experimentally observed cavity images,we found that large eddy simulation(LES)turbulence modeling effectively replicates the geometrical properties of cavitation in these valves.The analysis demonstrated that cavitation is generated from vortices that result from the interaction between the notch contracta flow and the surrounding fluid structure.Variations in the internal or external vena contracta conditions result in fixed or discrete cavities,and the length-to-diameter ratio serves as a measure of the transition between internal and external vena contracta flow properties.This study establishes a threshold length-to-diameter ratio of approximately 2 for the tested poppet valves.More specifically,in notch structures with a smaller valve opening,longer sealing length,and smaller throttling angle(corresponding to a larger length-to-diameter ratio),the liquid-to-vapor transfer process is more evident than that in the reverse direction.A long-standing vapor cavity becomes fixed inside the notch,leading to a more pronounced flow-choking phenomenon.In contrast,for structures with a smaller length-to-diameter ratio,the cavitation process for discrete vapor cavities is more complete,ensuring fluid flow continuity and significantly reducing the occurrence of the flow-choking phenomenon.
      原文链接:
    • NETL
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    Fault diagnosis of a marine power-generation diesel engine based on the Gramian angular field and a convolutional neural network

    Congyue LIYihuai HUJiawei JIANGDexin CUI...
    470-482页
    查看更多>>摘要：Marine power-generation diesel engines operate in harsh environments.Their vibration signals are highly complex and the feature information exhibits a non-linear distribution.It is difficult to extract effective feature information from the network model,resulting in low fault-diagnosis accuracy.To address this problem,we propose a fault-diagnosis method that combines the Gramian angular field(GAF)with a convolutional neural network(CNN).Firstly,the vibration signals are transformed into 2D images by taking advantage of the GAF,which preserves the temporal correlation.The raw signals can be mapped to 2D image features such as texture and color.To integrate the feature information,the images of the Gramian angular summation field(GASF)and Gramian angular difference field(GADF)are fused by the weighted average fusion method.Secondly,the channel attention mechanism and temporal attention mechanism are introduced in the CNN model to optimize the CNN learning mechanism.Introducing the concept of residuals in the attention mechanism improves the feasibility of optimization.Finally,the weighted average fused images are fed into the CNN for feature extraction and fault diagnosis.The validity of the proposed method is verified by experiments with abnormal valve clearance.The average diagnostic accuracy is 98.40%.When-20 dB≤signal-to-noise ratio(SNR)≤20 dB,the diagnostic accuracy of the proposed method is higher than 94.00%.The proposed method has superior diagnostic performance.Moreover,it has a certain anti-noise capability and variable-load adaptive capability.
      原文链接:
    • NETL
    • NSTL
    • 万方数据

    Deformation and stability of the seawall,considering the strength uncertainty of cement mixing piles

    Yuansheng YULingling LIXiangmiao KONGChengyuan LI...
    483-501,中插5-中插6页
    查看更多>>摘要：The cement mixing(CM)pile is a common method of improving soft offshore ground.The strength growth of CM piles under complex conditions is affected by many factors,especially the cement and moisture contents,and shows significant uncertainty.To investigate the stochasticity of the early strength of CM piles and its impact on the displacement and stability of a seawall,a series of laboratory tests and numerical analyses were carried out in this study.Vane shear tests were conducted on the cement-solidified soil to determine the relationships between the undrained shear strength su of the cement soil curing in the seawater and the cement content ac,as well as the in situ soil moisture content w.It can be inferred that the 24 h undrained shear strength follows a normal distribution.A numerical model considering the random CM pile strength was established to investigate the deformation of the seawall.Due to the uncertainty of CM pile strength,the displacement of the seawall demonstrates a certain discreteness.The decrease of the mean undrained shear strength of CM piles causes a corresponding increase in the average displacement of the seawall.When the mean strength of CM piles is lower than a certain threshold,there is a risk of instability.Furthermore,the heterogeneity of the strength within an individual CM pile also has an impact on seawall displacement.Attention should be paid to the uncertainty of CM pile strength to control displacement and stability.
      原文链接:
    • NETL
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    Corrosion behavior and protection mechanism of carbon steel coated with ethylene chlorotrifluoroethylene(ECTFE)

    Peihu SHENJun WENBiqin DONGHedong LI...
    502-515页
    查看更多>>摘要：Ethylene chlorotrifluoroethylene(ECTFE)coating was applied to the surface of carbon steel through electrostatic spraying and low-temperature heat treatment.The morphology and structure of the coating were analyzed using various characterization techniques.The electrochemical data of the coated steel soaked in 3.5%(mass fraction)NaCl solution for 90 d at different periods were also examined.The findings indicate that the outer surface of the coating remains structurally stable before and after soaking.F can diffuse into the steel substrate,facilitating the bonding between the coating and the steel substrate,but the free F also induces a weakening effect on the crystalline structure.Due to the thickness of the coating edge and the susceptibility to infiltration of the corrosive medium,under-film micro-zone corrosion occurs at a slow rate.After soaking for 90 d,the impedance modulus measures approximately 104 Ω·cm2,and the open circuit potential(OCP)is-0.61 V.The self-corrosion current density is 1.13×10-6 A/cm2,resulting in a calculated coating protection rate of 99.29%.In summary,despite edge corrosion occurring,the ECTFE coating provides excellent corrosion protection.
      原文链接:
    • NETL
    • NSTL
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    Effective removal of Sb(V)from aqueous solutions by micro-electrolysis with composite scrap iron-manganese as filler

    Shangkun DINGSaihua HUANGYiping ZHANGYongchao ZHOU...
    516-524,后插1-后插3页
    查看更多>>摘要：Micro-electrolysis(ME)technology is investigated for improving the efficiency of removal of pentavalent antimony(Sb(Ⅴ))from the environment.In this study,an ME system composed of scrap iron filings,waste manganese fillings,and activated carbon(Fe-Mn-C ME)was used to efficiently remove Sb(Ⅴ).The results proved that,compared with conventional iron-carbon micro-electrolysis(Fe-C ME),Fe-Mn-C ME significantly enhances the removal rate of Sb(Ⅴ)when the hydraulic retention time is 10-24 h.The Fe-Mn flocs produced by this system were analyzed using X-ray diffraction(XRD),energy-dispersive X-ray spectroscopy(EDS),X-ray photoelectron spectroscopy(XPS),and Brunauer-Emmett-Teller(BET)surface area analysis,which revealed that the flocs were mostly Mn-substituted FeOOH and had a relatively larger specific surface area,providing better adsorption performance.Furthermore,it was found that the removal rate of Sb(Ⅴ)decreased as the iron-carbon mass ratio increased,while it first increased and then decreased as the manganese content increased.The reduction of Fe(Ⅲ)was accelerated with an increase in the addition of manganese,leading to an increase in the concentration of Fe(Ⅱ).The electron transfer and the formation of Fe(II)were facilitated by the potential difference between manganese and carbon,as well as by the formation of microcells between iron and manganese,which improved the reduction ability of Sb(Ⅴ).From our thorough investigation and research,this is the first report that has proposed Fe-Mn-C ME for removing antimony.It provides a novel approach and technological support for removing Sb(Ⅴ)efficiently.
      原文链接:
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    • NSTL
    • 万方数据

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