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Multi-Scale Design and Optimization of co.posite Material Structure for Heavy-Duty Truck Protection Device

co.puter Modeling in Engineering & Sciences 2024年第5期139卷 1961-1980页

作者： Yanhui Zhang Lianhua Ma Hailiang Su Jirong Qin Zhining Chen Kaibiao Deng School of Mechanical and Automotive Engineering Guangxi University of Science and TechnologyLiuzhou545006China co.mercial Vehicle Technology Center Dongfeng Liuzhou Automobile Co.Ltd.Liuzhou545005China School of Mechanical and Automotive Engineering South China University of TechnologyGuangzhou510641China

In this paper,to present a lightweight-developed front underrun protection device(FUPD)for heavy-duty trucks,plain weave carbon fiber reinforced plastic(CFRP)is used instead of the original high-strength ***,the mechanical and structural properties of plain carbon fiber co.posite anti-co.lision beams are co.paratively analyzed from a multi-scale *** studying the design capability of carbon fiber co.posite materials,we investigate the effects of TC-33 carbon fiber diameter(D),fiber yarn width(W)and height(H),and fiber yarn density(N)on the front underrun protective beam of carbon fiber *** on the investigation,a material-structure matching strategy suitable for the front underrun protective beam of heavy-duty trucks is ***,the co.posite material structure is optimized by applying size optimization and stack sequence optimization methods to obtain the higher performance carbon fiber co.posite front underrun protection beam of co.mercial *** results show that the fiber yarn height(H)has the greatest influence on the protective beam,and theH1matching scheme for the front underrun protective beamwith a carbon fiber co.posite structure exhibits superior *** proposed method achieves a weight reduction of 55.21% while still meeting regulatory requirements,which demonstrates its remarkable weight reduction effect.

关键词： Structural optimization front underrun protection device carbon fiber reinforced plastic multi-scale model lightweight design

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Origin and evolution of false brinelling and fretting co.rosion under rolling co.ditions

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Friction 2024年第4期12卷 618-631页

作者： Xin JIA Lu HUANG Miao SUN Wenbin LI National Institute of Metrology Beijing 100029China Yantai Tiancheng machinery co. Ltd.Yantai 264006China

Rolling bearings working in oscillating applications often suffer from false brinelling and fretting co.rosion that limit their service *** present,the study of oscillation-induced failures is primarily dominated by a large number of sliding and bench ***,most of the previous work are not able to fully describe the two closely related but different failure *** this study,the origin and evolution of the two failures are thoroughly investigated under strictly co.trolled oscillating rolling *** results show that failure evolves from false brinelling to fretting co.rosion under dry friction co.ditions regardless of the oscillation *** process is acco.panied by a large area peeling and serious oxidation,and the oxygen co.tent increases from 2.50 wt%to 21.22 wt%.Oxidation is a crucial factor in the evolution of false brinelling into fretting ***,the distribution of microwear and oxygen co.tent depend on the oscillation *** lubrication co.ditions,the friction co.fficient(co.)is smaller in the initial stage and led to local slip or transient instability of rolling ***,the size of the wear marks and co. increased and appeared to be larger than those under a dry friction ***,grease can separate the co.tact surfaces,only surface deformation owing to false brinelling and slight damage at the roughness level *** evolution of false brinelling and fretting co.rosion is also closely related to residual *** brinelling often occurrs with residual stress acco.ulation,meanwhile,the residual stress increases from 120 to 300 *** peeling occurs,residual stress is *** failure pattern transformed from false brinelling to fretting co.rosion and is acco.panied by *** far,none of investigation is able to show satisfactory evolution of oscillating-induced failures,this study may co.tribute to more scientific understanding of rolling bearings against long-

关键词： oscillating false brinelling fretting co.rosion wear residual stress

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High-stability double-layer polymer-inorganic co.posite electrolyte fabricated through ultraviolet curing process for solid-state lithium metal batteries

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Frontiers of Materials Science 2024年第2期18卷 117-128页

作者： Xinghua Liang Pengcheng Shen Lingxiao Lan Yunmei Qin Ge Yan Meihong Huang Xuanan Lu Qiankun Hun Yujiang Wang Jixuan Wang Guangxi Key Laboratory of Automobile co.ponents and Vehicle Technology Guangxi University of Science&TechnologyLiuzhou 545006China Guangxi Automobile Group co. Ltd.Liuzhou 545006China School of Automotive Engineering Guangdong Polytechnic of Industry and CommerceGuangzhou 510510China

Electrolyte interface resistance and low ionic co.ductivity are essential issues for co.mercializing solid-state lithium metal batteries(SSLMBs).This work details the fabrication of a double-layer solid co.posite electrolyte(DLSCE)for *** co.posite co.prises poly(vinylidene fluoride-co.hexafluoropropylene)(PVDF-HFP)and poly(methyl methacrylate)(PMMA)co.bined with 10 wt.%of Li_(6.4)La_(3)Zr_(1.4)Ta_(0.6)O_(12)(LLZTO),synthesized through an ultraviolet curing *** ionic co.ductivity of the DLSCE(2.6×10^(-4) S·cm^(-1))at room temperature is the high lithium-ion transference number(0.57),and the tensile strength is 17.8 *** this DLSCE was assembled,the resulted LFP/DLSCE/Li battery exhibited excellent rate performance,with the discharge specific capacities of 162.4,146.9,93.6,and 64.0 mA·h·g^(-1) at 0.1,0.2,0.5,and 1 C,***,the DLScE demonstrates remarkable stability with lithium metal batteries,facilitating the stable operation of a Li/Li symmetric battery for over 200 h at both 0.1 and 0.2 ***,the formation of lithium dendrites is also effectively inhibited during *** work provides a novel design strategy and preparation method for solid co.posite electrolytes.

关键词： electrochemicalreliability lithium metal battery lithium-ion transference number double-layer solid co.posite electrolyte

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Optimization of the co.closing law of guide vanes and blades for bulb turbines based on CFD

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Journal of Hydrodynamics 2024年第2期36卷 363-377页

作者： Hui Liu Yun-fa Lin Yong-guang Cheng Song Xue Mao-jia Tang Jian Zhang Jia-yi Fan State Key Laboratory of Water Resources Engineering and Management Wuhan UniversityWuhan430072China Dongfang Electric machinery co. Ltd.Deyang618000China

The load rejection transient process of bulb turbine units is critical to safety of hydropower stations,and determining appropriate closing laws of guide vanes(GVs)and runner blades(RBs)for this process is of *** this study,we proposed a procedure to optimize the co.closing law of GVs and RBs by using co.putational fluid dynamics(CFD),co.bined with the design of experiment(DOE)method,approximation model,and genetic optimization *** sensitivity of closing law parameters on the histories of head,speed,and thrust was analyzed,and a two-stage GVs’closing law associating with a linear RBs’closing law was *** results show that GVs dominate the transient characteristics by co.trolling the change of *** GVs’first-stage closing speed while shortening first-stage closing time can not only significantly reduce the maximum rotational speed but also suppress the water hammer pressure;slowing GVs’seco.d-stage closing speed is co.ducive to co.trolling the maximum reverse axial *** directly affect the runner *** RBs’closing speed can further reduce the rotational speed and the maximum reverse axial *** safety margin of each co.trol parameter,flow patterns,and pressure pulsations of a practical hydropower station were all improved after optimization,demonstrating the effectiveness of this method.

关键词： Bulb turbine load rejection transient process double regulation closing law optimization co.putational fluid dynamics(CFD)

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Parameter Estimation of a Valve-co.trolled Cylinder System Model Based on Bench Test and Operating Data Fusion

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Chinese Journal of Mechanical Engineering 2024年第2期37卷 247-263页

作者： Deying Su Shaojie Wang Haojing Lin Xiaosong Xia Yubing Xu Liang Hou Pen-Tung Sah Institute of Micro-Nano Science and Technology Xiamen UniversityXiamen 361102China Xuzhou XCMG Excavation machinery co. LtdXuzhou 221000China

The accurate estimation of parameters is the premise for establishing a high-fidelity simulation model of a valve-co.trolled cylinder *** test data are easily obtained,but it is challenging to emulate actual loads in the research on parameter estimation of valve-co.trolled cylinder *** the actual load information co.tained in the operating data of the co.trol valve,its acquisition remains *** paper proposes a method that fuses bench test and operating data for parameter estimation to address the aforementioned *** proposed method is based on Bayesian theory,and its co.e is a pool fusion of prior information from bench test and operating ***,a system model is established,and the parameters in the model are ***,the bench and operating data of the system are ***,the model parameters and weight co.fficients are estimated using the data fusion ***,the estimated effects of the data fusion method,Bayesian method,and particle swarm optimisation(PSO)algorithm on system model parameters are *** research shows that the weight co.fficient represents the co.tribution of different prior information to the parameter estimation *** effect of parameter estimation based on the data fusion method is better than that of the Bayesian method and the PSO *** load co.plexity leads to a decrease in model accuracy,highlighting the crucial role of the data fusion method in parameter estimation studies.

关键词： Valve-co.trolled cylinder system Parameter estimation The Bayesian theory Data fusion method Weight co.fficients

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Enhancing capacitive deionization performance and cyclic stability of nitrogen-doped activated carbon by the electro-oxidation of anode materials

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Chinese Journal of Chemical Engineering 2024年第5期69卷 23-33页

作者： Xiaona Liu Baohua Zhao Yanyun Hu Luyue Huang Jingxiang Ma Shuqiao Xu Zhonglin Xia Xiaoying Ma Shuangchen Ma School of Environmental Science and Engineering North China Electric Power UniversityBaoding 071003China Huadian Zhengzhou machinery Design and Research Institute co. LtdZhengzhou 450002China Huadian Inner Mongolia Energy co. Ltd.Baotou Power Generation BranchBaotou 014013China

Electrode materials with high desalination capacity and long-term cyclic stability are the focus of capacitive deionization(CDI) co.munity. Understanding the causes of performance decay in traditional carbons is crucial to design a high-performance material. Based on this, here, nitrogen-doped activated carbon(NAC) was prepared by pyrolyzing the blend of activated carbon powder(ACP) and melamine for the positive electrode of asymmetric CDI. By co.paring the indicators changes such as co.ductivity, salt adsorption capacity, pH, and charge efficiency of the symmetrical ACP-ACP device to the asymmetric ACP-NAC device under different CDI cycles, as well as the changes of the electrochemical properties of anode and cathode materials after long-term operation, the reasons for the decline of the stability of the CDI performance were revealed. It was found that the carboxyl functional groups generated by the electro-oxidation of anode carbon materials make the anode zero-charge potential(E_(pzc)) shift positively,which results in the uneven distribution of potential windows of CDI units and affects the adsorption capacity. Furthermore, by understanding the electron density on C atoms surrounding the N atoms, we attribute the increased cyclic stability to the enhanced negativity of the charge of carbon atoms adjacent to quaternary-N and pyridinic-oxide-N.

关键词： Anodic oxidation Capacitive deionization Cyclic stability N-doping

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Design method of extractant for liquid-liquid extraction based on elements and chemical bonds

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Chinese Journal of Chemical Engineering 2024年第4期68卷 193-202页

作者： Yuwen Wei Chunling Zhang Yue Zhang Lili Wang Li Xia Xiaoyan Sun Shuguang Xiang Institute of Process System Engineering College of Chemical EngineeringQingdao University of Science and TechnologyQingdao 266042China Yantai Guobang Chemical machinery Technology co. Ltd.Yantai 264002China

In the petrochemical industry process, the relative volatility between the co.ponents to be separated is close to one or the azeotrope that systems are difficult to separate. Liquid-liquid extraction is a co.mon and effective separation method, and selecting an extraction agent is the key to extraction technology research. In this paper, a design method of extractants based on elements and chemical bonds was proposed. A knowledge-based molecular design method was adopted to pre-select elements and chemical bond groups. The molecules were automatically synthesized acco.ding to specific co.bination rules to avoid the problem of “co.bination explosion” of molecules. The target properties of the extractant were set, and the extractant meeting the requirements was selected by predicting the co.relation physical properties of the generated molecules. Based on the separation performance of the extractant in liquid-liquid extraction and the relative importance of each index, the fuzzy co.prehensive evaluation membership function was established, the analytic hierarchy process determined the mass ratio of each index, and the co.sistency test results were passed. The results of case study based on quantum chemical analysis demonstrated that effective determination of extractants for the analysis of benzene-cyclohexane systems. The results unanimously prove that the method has important theoretical significance and application value.

关键词： Molecular design Element and chemical bonds Molecular simulation Thermodynamics Solvent extraction

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Three-dimensional parametric co.tact analysis of planetary roller screw mechanism and its application in grouping for selective assembly

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Frontiers of Mechanical Engineering 2024年第1期19卷 53-72页

作者： Huilin HE Peitang WEI Huaiju LIU Xuesong DU Rui HU Genshen LIU Yajun WU State Key Laboratory of Mechanical Transmission for Advanced Equipment Chongqing UniversityChongqing 400044China Taiyuan Heavy machinery Group co. Ltd.Taiyuan 030024China

The planetary roller screw mechanism(PRSM)is a novel precision transmission mechanism that realizes the co.version between linear and rotary *** co.tact characteristics of helical surfaces directly determine PRSM’s performance in load-carrying capacity and transmission ***,studying the co.tact characteristics of PRSM forms the fundamental basis for enhancing its transmission *** this study,a three-dimensional parametric analysis method of co.tact characteristics is proposed based on the PRSM meshing principle and PyVista(a high-level API to the Visualization Toolkit).The proposed method co.siders the influence of machining errors among various thread *** effects of key machining errors on co.tact positions and axial clearance,as well as their sensitivities,are *** excellent solution accuracy,this method exhibits higher calculation efficiency and stronger robustness than the analytical and numerical meshing *** influence of nominal diameter and pitch errors of the screw,roller,and nut on the axial clearance follows a linear relationship,whereas flank angle errors have negligible effects on the axial *** co.responding influence co.fficients for these three machining errors on the axial clearance are 0.623,0.341,and *** variations in co.tact positions caused by individual errors are *** angle errors and roller diameter errors result in linear displacements of the co.tact points,whereas pitch errors cause the co.tact points to move along the arc of the roller *** on the proposed threedimensional parametric co.tact characteristics analysis method,the Fuzzy C-Means clustering algorithm co.sidering error sensitivity is utilized to establish a co.ponent grouping technique in the selective assembly of critical PRSM co.ponents,ensuring the rational and co.sistent clearances based on the given co.ponent’s machining *** study provides effective guidance for analyzing co.ta

关键词： planetary roller screw mechanism(PRSM) co.tact position axial clearance machining error grouping for selective assembly

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Preparation and property of seal co.ting for gas turbine co.pressor

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China Welding 2024年第1期33卷 60-64页

作者：余沛坰刘中华郑健生徐伏根陈千宝 Zhejiang Ranco. Turbine machinery co. Ltd.Hangzhou 310020China Hangzhou Steam Turbine Power Group co. Ltd.Hangzhou 310020China

Double-layer structure of seal co.ting which co.sisted of a Ni5Al bond co.ting and a Ni25 graphite top co.ting were prepared on steel substrate of gas turbine co.pressor cylinder *** co.ting was prepared by atmospheric plasma spraying and top co.ting was prepared by flame *** microstructure,mechanical properties and abradability of the co.ting were characterized by scanning elec-tron microsco.e(SEM),hardness tester,universal testing machine,thermal shock testing machine and abradability testing *** res-ults show that the overall spraying structure of the seal co.ting is uniform,the nickel metal phase is the skeleton supporting the entire co.t-ing,and the co.ting is well bonded without *** seal co.ting has a bonding strength of not less than 7.7 MPa,excellent thermal stability,and thermal shock resistance cycle numbers at 500℃more than 50;the scratch length,deepest invasion depth and wear amount of the co.ting increase with rise of test temperature,with almost no co.ting adhesion,indicating that the seal co.ting has excellent abradability.

关键词： gas turbine co.pressor seal co.ting microstructure mechanical property abradability

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压缩载荷下新型折纸结构的吸能特性研究

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Acta Mechanica Sinica 2024年第5期40卷 116-140页

作者：唐勇李奇奇苗秀娟陈博浩尹来容刘鑫顾成波 co.lege of Automotive and Mechanical Engineering Changsha University of Science & Technology Changsha China AISN Innovative Design and Manufacturing co. Ltd. Liuzhou China

受折纸形状的启发,通过单折纸单元结构(SOSs)的排列获得了两种折纸管。在准静态压缩载荷下,同向折纸管(SOT)的比吸能(SEA)值比反向折纸管(ROT)高13.46%.ROT显示了压缩旋转的变形模式,而SOT则是逐层破碎.通过折纸管和连接板的组合,提出... 详细信息

受折纸形状的启发,通过单折纸单元结构(SOSs)的排列获得了两种折纸管。在准静态压缩载荷下,同向折纸管(SOT)的比吸能(SEA)值比反向折纸管(ROT)高13.46%.ROT显示了压缩旋转的变形模式,而SOT则是逐层破碎.通过折纸管和连接板的组合,提出了两层、三层和四层的折纸结构,它们的能量吸收效率明显高于折纸管。这些折纸结构表现出稳定的变形模式,主要是轴向压缩、扭转和混合变形模式.具有四个ROT的折纸结构(4R)的变形模式与麻花的形状相似.关于两层结构,由反向SOT(RSOT)和SOT组成的折纸结构的SEA值明显高于由ROT和SOT以及ROT和RSOT组成的折纸结构.此外,两层折纸结构的压缩性能明显优于三层和四层折纸结构.具有两个RSOT和两个SOT的两层折纸结构(2RS2S)的SEA值分别高于具有四个A细胞的三层折纸结构(4A)和具有一个C细胞和三个D细胞的四层折纸结构(1C3D)68.05%和64.48%.总之,这些折纸结构表现出卓越的机械性能,在吸能结构中具有广泛的应用潜力.

关键词：能量吸收效率变形模式折纸单元结构压缩载荷连接板吸能结构轴向压缩

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