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A hydrodynamic modelling of w.ve-activated bodies.for w.velet marine regions

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CLEAN ENERGY 2024年第2期8卷 35-47页

作者： Peh, J. s. Muhieldeen, Mohammed w. s.uaib, N. H. UCs. Univ Fac Engn Technol & Built Environm Mech Engn Dept Kuala Lumpur 56000 Malaysia MTC Engineer s.n Bhd Shah Alam Selangor Malaysia

Recently, mos. w.ve energy res.arch has.targeted s.a areas.w.th high pow.r dens.ty under extreme w.ve conditions.for deployment. This.trend often leads.to higher energy cos.s.for w.ve pow.r plants. How.ver, many marine areas.w.th low.pow.r dens.ty, characterized by w.velet conditions.and les. des.ructive forces.than extreme w.ve conditions. remain underexplored. Therefore, this.s.udy aimed to propos. a w.ve-activated body model for s.a regions.w.th w.velet conditions. The w.ve-activated body des.gn proces. encompas.ed s.te s.lection, parameter determination, geometry des.gn, comparis.n and performance evaluation us.ng the ANs.s.(R) AQw. model. The res.lts.indicated that the propos.d device achieved the des.red heave motion, w.th an amplitude range of 1.2 to -2.5 m, validating its.potential for deployment in marine regions.w.th w.velet conditions. Notably, w.ile the propos.d des.gn is.optimized for w.velet conditions. it w.s.found to have potential limitations.in extreme w.ve environments. This.obs.rvation emphas.zes.the challenge of formulating a generalized des.gn s.itable for both conditions. Cons.quently, it is.pivotal for w.ve-activated body des.gns.to be cus.omized bas.d on the s.ecific ocean conditions.they target, unders.oring the need for s.ecialized des.gns.of w.ve energy converters.that cons.der the unique w.ve characteris.ics.of their deployment s.tes. A w.ve-activated body is.des.gned for energy generation in ocean regions.w.th w.velet conditions. Hydrodynamic modelling is.carried out for tw. locations.w.th different w.ve characteris.ics.to determine the optimum conditions.for deployment. Graphical Abs.ract

关键词： w.ve energy converter s.uth China s.a renew.ble and s.s.ainable energy w.velet ANs.s.AQw. hydrodynamic w.ve-activated bodies ENERGY IMPACT

Evaluation of Accuracy and Precis.on of IRMs.by Us.ng s.andard Materials.and Applications

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Journal of Agricultural Chemis.ry and Environment 2016年第4期5卷 211-222页

作者： J. Y. Hw.ng B. K. Kim M. s. Kim J. w. Choi T. s. Kim w. s. lee s.il and Groundw.ter Res.arch Divis.on National Institute of Environmental Research Environment Research Complex Incheon Republic of Korea Environmental Meas.rement & Analys.s.Center National Institute of Environmental Research Environment Research Complex Incheon Republic of Korea Integrated Pollution Prevention and Control Tas. Force National Institute of Environmental Research Environment Research Complex Incheon Republic of Korea

The is.tope ratio mas. s.ectrometer (IRMs. is.an ins.rument that meas.res.both of the elemental contents.and is.tope ratios.of hydrogen, oxygen, carbon, nitrogen and s.lfur in environmental s.mples.at the s.me time. In this.s.udy, w. w.nt to try to get tw. main goals.firs., to make up for s.tting the analytical conditions.s.ch as.accuracy and precis.on, s.cond, to apply for comparing of the carbon and nitrogen is.tope ratio of s.diments.in the abandoned mine located in middle province of Korea. For the firs. goal, a recently introduced IRMs.w.s.us.d to analyze CRM (certified reference materials., w.ich helped to make up the analytical conditions.of carbon and nitrogen is.tope ratios. s., the accuracy and precis.on of is.tope ratios.and elemental contents.w.re als. as.es.ed s.multaneous.y, and als. the res.lts.w.re very s.tis.actory. The analytical res.lts.of carbon reference materials.(EMA-P2) s.ow.d an accuracy of -2.801 × 10‰ ± 0.01‰ (2σ) and a precis.on of 0.009‰ in the mas. range from 0.008 μg - 0.162 μg. For nitrogen reference materials.(EMA-P2), an accuracy of -1.632‰ ± 0.72‰ (2σ) w.s.obtained in the mas. range from 0.082 - 0.162 mg. Thes. values.of accuracy and precis.on are higher than thos. reported by other s.udies. For the s.cond goal, carbon and nitrogen is.topes.in river s.diment near abandoned mines.w.re analyzed bas.d on the es.ablis.ed analytical conditions. The res.lt s.gges.ed that carbon is.tope ratios.ranged from -22.5‰ - -7.5‰ and nitrogen is.tope ratios.from -1.9‰ - 7.9‰. By comparing the is.tope ratios.and s.mpling s.tes.of s.diment, w. know.that the nitrogen is.tope values.in s.mples.of entrance area of mine are greater than thos. of the farm hous. area, w.ich is.indicating the effects.of organic materials. s., w. could gues. that the new.y accumulated organic materials.w.re much more in the farm hous. area than mine entrance area. And a res.lt of this.s.udy, the accuracy and precis.on tes.s.of IRMs.us.ng certified reference materials.w.re ve

关键词： s.able Is.tope Carbon Is.tope Nitrogen Is.tope Precis.on Accuracy

Coating pow.er beds.w.th liquids.and foams.bas.d on vis.ous.formulations.us.ng a tw.n s.rew.mixer: A continuous.proces. s.udy

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PARTICUOLOGY 2024年第10期93卷 364-376页

作者： Manga, Mohamed s. Kontziampas.s. Dimitrios.Al-Maqdad, Mus.afa Clifford, s.an Bakalis. s.rafim York, David w. Univ leeds Fac Engn & Phys Sci Sch Chem & Proc Engn Leeds LS2 9JT England Univ leeds Sch Mech Engn Fac Engn & Phys Sci Leeds LS2 9JT England Univ Dundee Sch Sci & Engn Dundee DD1 4HN Scotland Cent s.uth Univ Dundee Int Inst Tongzipo Rd Changsha 410013 Hunan Peoples R China Univ New.as.le Sch Engn Dept Chem Engn Newcastle Upon Tyne NE1 7RU England Univ Birmingham Sch Chem Engn Birmingham B15 2TT England Univ Nottingham Fac Engn Dept Chem Engn Nottingham NG7 2RD England

Coating w.th vis.ous.formulations.has.been es.ential in numerous.indus.ries.as.it can be a means.for providing functionalization, additional properties. as.w.ll as.other benefits. How.ver, there have been s.arce s.udies.that have inves.igated and propos.d methodologies.in literature. Continuous.coating of pow.ers.w.th vis.ous.liquids.pos.s.as.a promis.ng technology, w.ich has.been mentioned in s.me s.udies. but has.not yet been thoroughly inves.igated. This.paper employs.the us. of image proces.ing and analys.s. in combination w.th s.atis.ical analys.s.of particles.to evaluate the effectivenes. of foams.and liquids.as.a means.of coating pow.er beds. Tw. different s.zes.of tw.n s.rew.mixers.that are w.rking in continuous.operation are employed, and a new.continuous.foaming device is.fabricated and us.d for the experiments.of coating. The effect of materials.and proces. parameters.(as.for example rotational s.eed, and flow.ate) on the quality of coating are inves.igated. Image analys.s.is.us.d to as.es. the coating quality. The res.lts.clearly s.ow.as. the potential of us.ng tw.n s.rew.mixers.for coating purpos.s.and not only for mixing. The hypothes.s.that us.ng large bubble foams.to improve the coating of vis.ous.liquids.on particles.is.proven correct, as.they provide higher quality coatings.compared to their equivalent liquids. w.en us.d in the tw.n s.rew.mixer. s.rpris.ngly, us.ng a larger s.ale tw.n s.rew.mixer, does.not s.ow.a s.bs.antial effect on the mixing, regarding quality, how.ver there is.s.ill a requirement for mix optimization for achieving s.ale-up of this.proces.. Thes. res.lts.provide a new.pathw.y for coating pow.ers.w.th vis.ous.formulations.in indus.rial applications. requiring les. energy and effort in this.proces., and can pave the w.y tow.rds.introducing more s.s.ainable indus.rial methodologies.for coating. (c) 2024 Chines. s.ciety of Particuology and Ins.itute of Proces. Engineering, Chines. Academy of s.iences. Publis.ed by Els.vier B.V. Thi

关键词： Pow.er coating Continuous.proces.ing Vis.ous.liquid Foam Image analys.s Pos.tron emis.ion particle traking (PEPT) EMIs.ION PARTICLE TRACKING GROw.H REGIME MAP w.T GRANULATION ENCAPs.LATION PENETRATION NUCLEATION

s.perplas.icity of fine-grained Mg-10Li alloy prepared by s.vere plas.ic deformation and unders.anding its.deformation mechanis.s

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Journal of Magnes.um and Alloys 2024年第1期12卷 316-331页

作者： H.T.Jeong s.w.lee w.J.Kim Department of Materials.s.ience and Engineering Hongik UniversityMapo-guSangsu-dong 72-1Seoul 121-791Republic of Korea

The s.perplas.ic behavior and as.ociated deformation mechanis.s.of a fine-grained Mg-10.1 Li-0.8Al-0.6Zn alloy(LAZ1011)w.th a grain s.ze of 3.2μm,primarily compos.d of the BCCβphas. and a s.all amount of the HCPαphas.,w.re examined in a temperature range of 473 K to 623 *** micros.ructural refinement of this.alloy w.s.achieved by employing high-ratio differential s.eed *** bes. s.perplas.icity w.s.achieved at 523 K and at s.rain rates.of 10^(-4)-5×10^(-4)s.(-1),w.ere tens.le elongations.of 550±600%w.re *** the heating and holding s.age of the tens.le s.mples.prior to tens.le loading,a s.gnificant increas. in grain s.ze w.s.obs.rved at temperatures.above 573 ***,it w.s.important to cons.der this.effect w.en analyzing and unders.anding the s.perplas.ic deformation behavior and *** the inves.igated s.rain rate range,the s.perplas.ic flow.at low.s.rain rates.w.s.governed by lattice diffus.on-controlled grain boundary s.iding,w.ile at high s.rain rates.lattice diffus.on-controlled dis.ocation climb creep w.s.the rate-controlling deformation *** w.s.concluded that s.lute drag creep is.unlikely to *** the late s.ages.of deformation at 523 K,it w.s.obs.rved that grain boundary s.iding led to the agglomeration of theαphas.,res.lting in s.gnificant s.rain *** mechanis. maps.w.re cons.ructed forβ-Mg-Li alloys.in the form of 2D and 3D formats.as.a function of s.rain rate,s.res.,temperature,and grain s.ze,us.ng the cons.itutive equations.for various.deformation mechanis.s.derived bas.d on the data of the current tes.s.

关键词： Magnes.um-lithium alloy s.perplas.icity s.vere plas.ic deformation Grain s.ze Grain grow.h

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Generalized autoencoder-bas.d fault detection method for traction s.s.ems.w.th performance degradation

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High-s.eed Railw.y 2024年第3期2卷 180-186页

作者： Cheng C. Liu w. Di L. w.ng s. Changchun Univers.ty of Technology Changchun 130012 China Jilin Ins.itute of Electronics.Information Products.Ins.ection Changchun 130012 China

Fault diagnos.s.of traction s.s.ems.is.important for the s.fety operation of high-s.eed trains. Long-term operation of the trains.w.ll degrade the performance of s.s.ems. w.ich decreas.s.the fault detection accuracy. To s.lve this.problem, this.paper propos.s.a fault detection method developed by a Generalized Autoencoder (GAE) for s.s.ems.w.th performance degradation. The advantage of this.method is.that it can accurately detect faults.w.en the traction s.s.em of high-s.eed trains.is.affected by performance degradation. Regardles. of the probability dis.ribution, it can handle any data, and the GAE has.extremely high s.ns.tivity in anomaly detection. Finally, the effectivenes. of this.method is.verified through the Traction Drive Control s.s.em (TDCs. platform. At different performance degradation levels. our method's.experimental res.lts.are s.perior to traditional methods. © 2024 Beijing Jiaotong Univers.ty

关键词： Fault detection Generalized autoencoder High-s.eed trains Performance degradation Traction control s.s.ems

Generalized polynomial chaos.expans.on by reanalys.s.us.ng s.atic condens.tion bas.d on s.bs.ructuring

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Applied Mathematics.and Mechanics.Englis. Edition) 2024年第5期45卷 819-836页

作者： D.lee s.CHANG J.lee Department of Automotive Engineering Hanyang UniversitySeoul 04763Republic of Korea s.hool of Mechanical Engineering Chungnam National UniversityDaejeon 34134Republic of Korea Department of Mechanical Robotics and Energy EngineeringDongguk UniversitySeoul 04620Republic of Korea

This.paper pres.nts.a new.computational method for forw.rd uncertainty quantification(UQ)analys.s.on large-s.ale s.ructural s.s.ems.in the pres.nce of arbitrary and dependent random *** method cons.s.s.of a generalized polynomial chaos.expans.on(GPCE)for s.atis.ical moment and reliability analys.s.as.ociated w.th the s.ochas.ic output and a s.atic reanalys.s.method to generate the input-output data *** the reanalys.s.w. employ s.bs.ructuring for a s.ructure to is.late its.local regions.that vary due to random *** allow. for avoiding repeated computations.of invariant s.bs.ructures.w.ile generating the input-output data *** s.bs.ructuring w.th s.atic condens.tion further improves.the computational efficiency of the reanalys.s.w.thout los.ng ***,the GPCE w.th the s.atic reanalys.s.method can achieve s.gnificant computational s.ving,thus.mitigating the curs. of dimens.onality to s.me degree for UQ under high-dimens.onal *** numerical res.lts.obtained from a s.mple s.ructure indicate that the propos.d method for UQ produces.accurate s.lutions.more efficiently than the GPCE us.ng full finite element analys.s.FEAs..w. als. demons.rate the efficiency and s.alability of the propos.d method by executing UQ for a large-s.ale w.ng-box s.ructure under ten-dimens.onal(all-dependent)random inputs.

关键词： forw.rd uncertainty quantification(UQ) generalized polynomial chaos.expans.on(GPCE) s.atic reanalys.s.method s.atic condens.tion s.bs.ructuring

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s.m-to-Real: A Performance Comparis.n of PPO, TD3, and s.C Reinforcement Learning Algorithms.for Quadruped w.lking Gait Generation

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Journal of Intelligent Learning s.s.ems.and Applications 2024年第2期16卷 23-43页

作者： James.w. Mock s.res. s. Muknahallipatna Department of Electrical Engineering and Computer s.ience University of Wyoming Laramie WY USA

The performance of the s.ate-of-the-art Deep Reinforcement algorithms.s.ch as.Proximal Policy Optimization, Tw.n Delayed Deep Determinis.ic Policy Gradient, and s.ft Actor-Critic for generating a quadruped w.lking gait in a virtual environment w.s.pres.nted in previous.res.arch w.rk titled “A Comparis.n of PPO, TD3, and s.C Reinforcement Algorithms.for Quadruped w.lking Gait Generation”. w. demons.rated that the s.ft Actor-Critic Reinforcement algorithm had the bes. performance generating the w.lking gait for a quadruped in certain ins.ances.of s.ns.r configurations.in the virtual environment. In this.w.rk, w. pres.nt the performance analys.s.of the s.ate-of-the-art Deep Reinforcement algorithms.above for quadruped w.lking gait generation in a phys.cal environment. The performance is.determined in the phys.cal environment by trans.er learning augmented by real-time reinforcement learning for gait generation on a phys.cal quadruped. The performance is.analyzed on a quadruped equipped w.th a range of s.ns.rs.s.ch as.pos.tion tracking us.ng a s.ereo camera, contact s.ns.ng of each of the robot legs.through force res.s.ive s.ns.rs. and proprioceptive information of the robot body and legs.us.ng nine inertial meas.rement units. The performance comparis.n is.pres.nted us.ng the metrics.as.ociated w.th the w.lking gait: average forw.rd velocity (m/s., average forw.rd velocity variance, average lateral velocity (m/s., average lateral velocity variance, and quaternion root mean s.uare deviation. The s.rengths.and w.aknes.es.of each algorithm for the given tas. on the phys.cal quadruped are dis.us.ed.

关键词： Reinforcement Learning Reality Gap Pos.tion Tracking Action s.aces Domain Randomization

Effect of s.ray Rails.on Takeoff Performance of Amphibian Aircraft

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w.rld Journal of Engineering and Technology 2024年第1期12卷 117-140页

作者： s.ham s. Bahulekar Alberto w. Mello Embry-Riddle Aeronautical Univers.ty Daytona Beach Florida USA

Amphibian aircraft have s.en a ris. in popularity in the recreational and utility s.ctors.due to their ability to take off and land on both land and w.ter, thus.s.rving a myriad of purpos.s. s.ch as.aerobatics. s.rveillance, and firefighting. s.ch s.aplanes.mus. be aerodynamically and hydrodynamically efficient, particularly during the takeoff phas.. Naval architects.have long employed innovative techniques.to optimize the performance of marine ves.els. including incorporating s.ray rails.on hulls. This.res.arch paper is.dedicated to a comprehens.ve inves.igation into the potential utilization of s.ray rails.to enhance the takeoff performance of amphibian aircraft. s.veral s.ray rail configurations.obtained from naval res.arch w.re s.mulated on a bare s.amax M22 amphibian hull to obs.rve an approximate 10% - 25% decreas. in w.ter res.s.ance at high s.eeds.alongs.de a 3% reduction in the takeoff time. This.s.udy s.rves.as.a motivation to improve the des.gn of the reference airplane hull and a platform for detailed inves.igations.in the future to improve modern amphibian des.gn.

关键词： s.aplane s.ray Rails Hull Optimization Take-Off Performance

Mathematical modeling and s.mulations.of s.res. mitigation by coating polycrys.alline particles.in lithium-ion batteries

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Applied Mathematics.and Mechanics.Englis. Edition) 2024年第6期45卷 947-962页

作者： N.IQBAL J.CHOI s.F.s.AH C.lee s.lee Department of Mechanical Roboticsand Energy EngineeringDongguk University-SeoulSeoul 04620Republic of Korea

A chemo-mechanical model is.developed to inves.igate the effects.on the s.res. development of the coating of polycrys.alline Ni-rich LiNixMnyCo_(z)O_(2)(x≥0.8)(NMC)particles.w.th poly(3,4-ethylenedioxythiophene)(PEDOT).The s.mulation res.lts.s.ow.that the coating of primary NMC particles.s.gnificantly reduces.the s.res. generation by efficiently accommodating the volume change as.ociated w.th the lithium diffus.on,and the coating layer plays.roles.both as.a cus.ion agains. the volume change and a channel for the lithium trans.ort,promoting the lithium dis.ribution acros. the s.condary particles.more ***,the low.r s.iffnes.,higher ionic conductivity,and larger thicknes. of the coating layer improve the s.res. *** paper provides.a mathematical framew.rk for calculating the chemo-mechanical res.ons.s.of anis.tropic electrode materials.and fundamental ins.ghts.into how.the coating of NMC active particles.mitigates.s.res. levels.

关键词： lithium-ion battery(LIB) polycrys.alline particle coating finite element s.mulation Ni-rich LiNixMnyCo_(z)O_(2)(x>0.8)(NMC)

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