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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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    High-efficiency ultrasonic assisted drilling of CFRP/Ti stacks under non-separation type and dry conditions

    Enze YINGZehua ZHOUDaxi GENGZhenyu SHAO...
    275-291,中插1-中插4页
    查看更多>>摘要：In this study,to address the low efficiency for conventional ultrasonic-assisted drilling(UAD)of carbon fiber-reinforced plastic and titanium alloy(CFRP/Ti)stacks,feasibility experiments of non-separation UAD,in which continuous cutting between the tool and the workpiece occurs at a high feed rate,are carried out.The experimental results indicate that,compared to conventional separation UAD,the non-separation UAD effectively reduces the cutting forces by 24.2%and 1.9%for CFRP stage and 22.1%and 2.6%for the Ti stage at the feed rates of 50 and 70 μm/r,respectively.Furthermore,the non-separation UAD significantly improves hole quality,including higher hole diameter accuracy,lower hole surface roughness,and less hole damage.In addition,the non-separation UAD can decrease adhesive tool wear.This study demonstrates that,compared to conventional drilling(CD),the non-separation UAD can effectively improve drilling quality and tool life while maintaining high efficiency.
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    Influence of overhanging tool length and vibrator material on electromechanical impedance and amplitude prediction in ultrasonic spindle vibrator

    Rendi KURNIAWANMoran XUMin Ki CHOOShuo CHEN...
    292-310,中插5-中插6页
    查看更多>>摘要：This study presents the development of an ultrasonic transducer with a radius horn for an ultrasonic milling spindle(UMS)system.The ultrasonic transducer was intended to have a working frequency of approximately 30 kHz.Two different materials were considered in the study:stainless steel(SS 316L)and titanium alloy(Ti-6Al-4V).Titanium alloy gave a higher resonance frequency(33 kHz)than stainless steel(30 kHz)under the same preload compression stress.An electromechanical impedance simulation was carried out to predict the impedance resonance frequency for both materials,and the effect of the overhanging toolbar was investigated.According to the electromechanical impedance simulation,the overhanging toolbar length affected the resonance frequency,and the error was less than 3%.Harmonic analysis confirmed that the damping ratio helps determine the resonance amplitude.Therefore,damping ratios of 0.015-0.020 and 0.005-0.020 were selected for stainless steel and titanium alloy,respectively,with an error of less than 1.5%.Experimental machining was also performed to assess the feasibility of ultrasonic-assisted milling;the result was a lesser cutting force and better surface topography of Al 6061.
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    Prediction of undeformed chip thickness distribution and surface roughness in ultrasonic vibration grinding of inner hole of bearings

    Yanqin LIDaohui XIANGGuofu GAOFeng JIAO...
    311-323页
    查看更多>>摘要：Ultrasonic vibration grinding differs from traditional grinding in terms of its material removal mechanism.The randomness of grain-workpiece interaction in ultrasonic vibration grinding can produce variable chips and impact the surface roughness of workpiece.However,previous studies used iterative method to calculate the unformed chip thickness(UCT),which has low computational efficiency.In this study,a symbolic difference method is proposed to calculate the UCT.The UCT distributions are obtained to describe the stochastic interaction characteristics of ultrasonic grinding process.Meanwhile,the UCT distribution characteristics under different machining parameters are analyzed.Then,a surface roughness prediction model is established based on the UCT distribution.Finally,the correctness of the model is verified by experiments.This study provides a quick and accurate method for predicting surface roughness in longitudinal ultrasonic vibration grinding.
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    Influence of vibration on the lubrication effect of a splash-lubricated gearbox

    Yi LIUKailin ZHANGShuai SHAOHongxu XIANG...
    324-339,中插7-中插12页
    查看更多>>摘要：In this study,we investigate the effect of rail vibrations on the lubrication and efficiency of a splash-lubricated gearbox;specifically,the gearbox of a rail-transit vehicle.A high-fidelity 3D numerical model of the gearbox in a moving reference system is described,as well as computational fluid dynamics(CFD)simulations of the gearbox with different vibration directions.The effects of rotational speed,oil-immersion depth,and different oil-injection volume rates on lubrication and efficiency are discussed.We propose a method of evaluating the internal lubrication condition of a splash-lubricated gearbox and quantitatively compare the effects of different operating parameters on lubrication and efficiency.Finally,our experiment to verify the feasibility of the simulation method is described.The results show that with vibration,the churning loss and oil supply for the bearings are significantly higher than those under static conditions.In addition,among different vibrational directions,lateral vibration has the greatest influence on the lubrication condition and efficiency of the gearbox.For the studied railway-vehicle gearbox,the best lubrication condition is achieved at a rotational speed of 1600 r/min and an oil-immersion depth of two times the tooth height(2.0h).Rotational speed is the operating parameter that has the most significant effect on the lubrication and efficiency of the gearbox.
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    N-doping offering higher photodegradation performance of dissolved black carbon for organic pollutants:experimental and theoretical studies

    Yong GUOMengxia CHENTing CHENYing GUO...
    340-356,后插1-后插13页
    查看更多>>摘要：We investigated the influence mechanism of N-doping for dissolved black carbon(DBC)photodegradation of organic pollutants.The degradation performance of N-doped dissolved black carbon(NDBC)for tetracycline(TC)(71%)is better than that for methylene blue(MB)(28%)under irradiation.These levels are both better than DBC degradation performances for TC(68%)and MB(18%)under irradiation.Reactive species quenching experiments suggest that h+ and·O2- are the main reactive species for NDBC photodegraded TC,while·OH and h+ are the main reactive species for NDBC photodegraded MB.·OH is not observed during DBC photodegradation of MB.This is likely because N-doping increases valence-band(VB)energy from 1.55 eV in DBC to 2.04 eV in NDBC;the latter is strong enough to oxidize water to form·OH.Additionally,N-doping increases the DBC band gap of 2.29 to 2.62 eV in NDBC,resulting in a higher separation efficiency of photo-generated electrons-holes in NDBC than in DBC.All these factors give NDBC stronger photodegradation performance for TC and MB than DBC.High-performance liquid chromatography-mass spectrometry(HPLC-MS)characterization and toxicity evaluation with the quantitative structure-activity relationship(QSAR)method suggest that TC photodegradation intermediates produced by NDBC have less aromatic structure and are less toxic than those produced by DBC.We adopted a theoretical approach to clarify the relationship between the surface groups of NDBC and the photoactive species produced.Our results add to the understanding of the photochemical behavior of NDBC.
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