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| 1 | Aero-engine Blade Fatigue Analysis Based on Nonlinear Continuum Damage Model Using Neural Networks显示文摘Fatigue life and reliability of aero-engine blade are always of important significance to flight safety.The establishment of damage model is one of the key factors in blade fatigue research.Conventional linear Miner's sum method is not suitable for aero-engine because of its low accuracy.A back propagation neutral network(BPNN) based on the combination of Levenberg-Marquardt(LM) and finite element method(FEM) is used to describe process of nonlinear damage accumulation behavior in material and predict fatigue life of the blade.Fatigue tests of standard specimen made from TC4 are carried out to obtain material fatigue parameters and S-N curve.A nonlinear continuum damage model(CDM),based on the BPNN with one hidden layer and ten neurons,is built to investigate the nonlinear damage accumulation behavior,in which the results from the tests are used as training set.Comparing with linear models and previous nonlinear models,BPNN has the lowest calculation error in full load range.It has significant accuracy when the load is below 500 MPa.Especially,when the load is 350 MPa,the calculation error of the BPNN is only 0.4%.The accurate model of the blade is built by using 3D coordinate measurement technology.The loading cycle in fatigue analysis is defined from takeoff to cruise in 10 min,and the load history is obtained from finite element analysis(FEA).Then the fatigue life of the compressor blade is predicted by using the BPNN model.The final fatigue life of the aero-engine blade is 6.55 104 cycles(10 916 h) based on the BPNN model,which is effective for the virtual design of aero-engine blade. | LIN Jiewei ZHANG Junhong ZHANG Guichang NI Guangjian BI Fengrong | 2012 | Chinese Journal of Mechanical Engineering2012，25，2： | 13 |
| 2 | Fatigue Crack Growth Rate of Ti-6Al-4V Considering the Effects of Fracture Toughness and Crack Closure显示文摘Fatigue fracture is one of the main failure modes of Ti-6A1-4V alloy,fracture toughness and crack closure have strong effects on the fatigue crack growth(FCG)rate of Ti-6A1-4V alloy.The FCG rate of Ti-6A1-4V is investigated by using experimental and analytical methods.The effects of stress ratio,crack closure and fracture toughness on the FCG rate are studied and discussed.A modified prediction model of the FCG rate is proposed,and the relationship between the fracture toughness and the stress intensity factor(SIF)range is redefined by introducing a correcting coefficient.Notched plate fatigue tests(including the fracture toughness test and the FCG rate test)are conducted to investigate the influence of affecting factors on the FCG rate.Comparisons between the predicted results of the proposed model,the Paris model,the Walker model,the Sadananda model,and the experimental data show that the proposed model gives the best agreement with the test data particularly in the near-threshold region and the Paris region,and the corresponding calculated fatigue life is also accurate in the same regions.By considering the effects of fracture toughness and crack closure,the novel FCG rate prediction model not only improves the estimating accuracy,but also extends the adaptability of the FCG rate prediction model in engineering. | ZHANG Junhong YANG Shuo LIN Jiewei | 2015 | Chinese Journal of Mechanical Engineering2015，28，2： | 5 |
| 3 | Reliability analysis of aero-engine blades considering nonlinear strength degeneration显示文摘To comprehensively consider the effects of strength degeneration and failure correlation, an improved stress-strength interference (SSI) model is proposed to analyze the reliability of aeroengine blades with the fatigue failure mode. Two types of TC4 alloy experiments are conducted for the study on the damage accumulation law. All the parameters in the nonlinear damage model are obtained by the tension-compression fatigue tests, and the accuracy of the nonlinear damage model is verified by the damage tests. The strength degeneration model is put forward on the basis of the Chaboche nonlinear damage theory and the Griffith fracture criterion, and determined by measuring the fatigue toughness during the tests. From the comparison of two kinds of degeneration models based on the Miner's linear law and the nonlinear damage model respectively, the nonlinear model has a significant advantage on prediction accuracy especially in the later period of life. A time-dependent SSI reliability model is established. By computing the stress distribution using the finite element (FE) technique, the reliability of a single blade during the whole service life is obtained. Considering the failure correlation of components, a modified reliability model of aero-engine blades with common cause failure (CCF) is presented. It shows a closer and more reasonable process with the actual working condition. The improved reliability model is illustrated to be applied to aero-engine blades well, and the approach purposed in this paper is suitable for any actual machinery component of aero-engine rotor systems. | Lin Jiewei Zhang Junhong Yang Shuo Bi Fengrong | 2013 | Chinese Journal of Aeronautics2013，26，3： | 4 |
| 4 | Psychoacoustic Study on Contribution of Fan Noise to Engine Noise显示文摘There are more researches on engine fan noise control focusing on reducing fan noise level through optimizing fan structure,and a lot of research achievements have been obtained.However,researches on the effect of fan noise to engine noise quality are lacking.The influences of the effects of fan structure optimization on the engine noise quality are unclear.Thus,there will be a decline in fan noise level,but the deterioration of engine noise quality.Aiming at the above problems,in consideration of fan structure design and engine noise quality,an innovative method to analyze the contribution of fan noise to engine noise quality using psychoacoustic theory is proposed.The noises of diesel engine installing different cooling fans are measured by using the acoustic pressure method.The experiment results are regarded as analysis samples.The model of sensory pleasantness is used to analyze the sound quality of a diesel engine with different cooling fans.Results show that after installing 10-blade fan in medium diameter the sensory pleasantness at each test point is increased,and the increase is 13.53% on average,which indicate the improvement of the engine noise quality.In order to verify the psychoacoustical analysis,the subjective assessment is carried out.The test result shows the noise quality of engine installed10-blade fan in medium diameter is most superior.1/3 octave frequency spectrum analysis is used to study the reason of the improvement of engine noise quality.It is found that after installing proper cooling fan the sound pressure level below 400 Hz are obviously increased,the frequency assignment and spectral envelope are more reasonable and a proper cooling fan can optimize the spectrum structure of the engine noise.The psychoacoustic study is applied in the contribution of fan noise to engine noise,and the idea of engine sound quality improvement through the structure optimization is proposed. | ZHANG Junhong LIU Hai BI Fengrong NI Guangjian ZHANG Guichang LIN Jiewei YU Hanzhengnan | 2012 | Chinese Journal of Mechanical Engineering2012，25，4： | 3 |
| 5 | Analysis of Oil Consumption in Cylinder of Diesel Engine for Optimization of Piston Rings显示文摘The performance and particulate emission of a diesel engine are affected by the consumption of lubricating oil.Most studies on oil consumption mechanism of the cylinder have been done by using the experimental method,however they are very costly.Therefore,it is very necessary to study oil consumption mechanism of the cylinder and obtain the accurate results by the calculation method.Firstly,four main modes of lubricating oil consumption in cylinder are analyzed and then the oil consumption rate under common working conditions are calculated for the four modes based on an engine.Then,the factors that affect the lubricating oil consumption such as working conditions,the second ring closed gap,the elastic force of the piston rings are also investigated for the four modes.The calculation results show that most of the lubricating oil is consumed by evaporation on the liner surface.Besides,there are three other findings:(1) The oil evaporation from the liner is determined by the working condition of an engine;(2) The increase of the ring closed gap reduces the oil blow through the top ring end gap but increases blow-by;(3) With the increase of the elastic force of the ring,both the left oil film thickness and the oil throw-off at the top ring decrease.The oil scraping of the piston top edge is consequently reduced while the friction loss between the rings and the liner increases.A neural network prediction model of the lubricating oil consumption in cylinder is established based on the BP neural network theory,and then the model is trained and validated.The main piston rings parameters which affect the oil consumption are optimized by using the BP neural network prediction model and the prediction accuracy of this BP neural network is within 8%,which is acceptable for normal engineering applications.The oil consumption is also measured experimentally.The relative errors of the calculated and experimental values are less than 10%,verifying the validity of the simulation results.Applying the established simulation model and the validated BP network model is able to generate numerical results with sufficient accuracy,which significantly reduces experimental work and provides guidance for the optimal design of the piston rings diesel engines. | ZHANG Junhong ZHANG Guichang HE Zhenpeng LIN Jiewei LIU Hai | 2013 | Chinese Journal of Mechanical Engineering2013，26，1： | 3 |
| 6 | Starch-based adhesive hydrogel with gel-point viscoelastic behavior and its application in wound sealing and hemostasis显示文摘Hydrogels with tissue adhesiveness have demonstrated great promise for wearable electronics,artificial skin,soft robotics,and tissue repair.Nevertheless,adhesive hydrogels that are capable of sealing and hemostasis of wound with severe hemorrhage still lack.For this purpose,a series of ionically crosslinked starch hydrogels were developed here.The viscoelastic properties and tissue adhesiveness of the starch hydrogels were investigated.It is shown that the starch and cross linkers had significant influence on the viscoelastic properties of the starch hydrogels,which further resulted in varied tissue adhesiveness.Among the starch gels,there was one exhibiting a unique and stable'Gel Point'viscoelastic characteristic and it was named as gel-point adhesive hydrogel(GPAH).GPAH showed electrical conductivity,high tissue adhesiveness,high stretch-ability,self-healing capability,injectability,and degradability.The GPAH also exhibited high cytocompatibility,low hemolysis risk,and strong antibacterial effect.The wound sealing and hemostatic performance of GPAH was further evaluated by a rat femoral artery injury model.The blood loss after the sealing of GPAH(2.4±1.3 g)was significantly decreased compared to the group using gauze for sealing(6.3±1.5 g).Meanwhile,GPAH did not cause pathological changes of the soft tissues surrounding the wound.The above results indicate that GPAH,with high tissue adhesiveness,suitable viscoelastic property,strong antibacterial capacity,as well as electro-conductivity,bears great potential for the applications in smart wound management. | Yuxuan Mao Peng Li Jiewei Yin Yanjie Bai Huan Zhou Xiao Lin Huilin Yang Lei Yang | 2021 | Journal of Materials Science & Technology2021，，4： | 3 |
| 7 | Interstitial copper-doped edge contact for n-type carrier transport in black phosphorus显示文摘Black phosphorus(BP)has been shown as a promising two-dimensional(2D)material for electronic devices owing to its high carrier mobility.To realize complementary electronic circuits with 2D materials,it is important to fabricate both n-type and p-type transistors with the same channel material.By engineering the contact region with copper(Cu)-doped BP,here we demonstrate an n-type carrier transport in BP field-effect transistors(FETs),which usually exhibit strongly p-type characteristics.Cu metal atoms are found to severely penetrate into the BP flakes,which forms interstitial Cu(Cuint)-doped edge contact and facilitates the electron transport in BP.Our BP FETs in backgated configuration exhibit n-type dominant characteristics with a high electron mobility of^138 cm^2 V^−1 s^−1 at room temperature.The Schottky barrier height for electrons is relatively low because of the edge contact between Cuint-doped BP and pristine BP channel.The contact doping of BP by highly mobile Cu atoms gives rise to n-type transport property of BP FETs.Furthermore,we demonstrate a p-n junction on the same BP flake with asymmetric contact.This strategy on contact engineering can be further extended to other 2D materials. | Ziyuan Lin Jingli Wang Xuyun Guo Jiewei Chen Chao Xu Mingqiang Liu Bilu Liu Ye Zhu Yang Chai | 2019 | InfoMat2019，1，2： | 2 |
| 8 | Dynamic anal- ysis of flexible rotor-ball bearings system with unbal- anee-misalignment-rubbing coupling faults显示文摘 | Zhang Junhong Ma Liang Lin Jiewei | 2012 | Trans Tech Publications2012，，： | 1 |
| 9 | Dynamic analy-sis of flexible rotor-ball bearings system with unbalance-misalignment-rubbing coupling faults显示文摘 | ZHANG Junhong MA Liang LIN Jiewei | 2012 | Applied Mechan-ics and Materials2012，105，： | 1 |
| 10 | Relationship between Renying pulse augmentation index and Cunkou pulse condition in different blood pressure groups显示文摘OBJECTIVE: To explore the relationship between Renying pulse (carotid) augmentation index (AI) and Cunkou pulse condition in different blood pressure groups, and the clinical significance of Renying and Cunkou pulse parameters to reflect vascular function.METHODS:Eighty-sixpatients with essential hypertension (EH) and 52 individuals with normal blood pressure(control group) between September 2010 and January 2012 were included in thisstudy.Renying pulse AI was examined by a new diagnostic tool(ALOKA ProSound Alpha 10) — wave intensity (WI) that is calculated as the product of the derivatives of the simultaneously recorded blood pressure changes(dP/dt) and blood-flow-velocity changes(dU/dt), while Cunkou pulse condition was detected by DDMX-100 Pulse Apparatus inboth EH and control groups. A multifactorial correlation analysis was performed for data analysis.RESULTS: After adjustingfor potentialconfoundingvariables,intheEHgroup,AIwaspositivelycorrelated with t5, w2/t(rt5=0.225, P<0.05; rw2/t=0.230, P<0.05)and negatively correlated with h5,h5/h1 and w2(rh5=﹣0.393,P<0.01;rh5/h1=﹣0.444,P<0.01;rw2=﹣0.389,P<0.01). In the control group, AI was positively correlated with t3, t4, t5 and w1(rt3=0.595, P<0.01; rt4=0.292, P<0.05; rt5=0.318, P<0.05; rw1=0.541, P<0.01)and negatively correlated with h1,h2,h3,AdandA(rh1=﹣0.368,P<0.05;rh2=﹣0.330,P<0.05;rh3=﹣0.327, P<0.05; rAd=﹣0.322, P<0.05; rA=﹣0.410, P<0.01). In the total sample group(EH plus control group, n=138), AI was positively correlated with t, t5, w1 and w2/t(rt=0.257,P<0.01;rt5=0.266,P<0.01;rw1=0.184,P<0.05; rw2/t=0.210, P<0.05) and negatively correlated with h5, h5/h1, w2 and Ad(rh5=﹣0.230, P<0.01; rh5/h1=﹣0.218, P<0.05; rw2=﹣0.267, P<0.01; rAd=﹣0.246,P<0.01). Multiple linear regression analysis was carried out to model the relationship(F=7.887, P<0.001).CONCLUSION:Renying pulse AI can effectively predict arterial stiffness in synchrony with the manifestations of Cunkou pulse in elderly patients with hypertension. Cunkou pulse apparatus is a valuable tool for evaluating AI in clinical practice. The close correlations reported above reflect the holistic concept of Traditional Chinese Medicine. | Jiewei Luo Xingyu Zheng Zijing Hu Jing Wu Shichao Wei Zhencheng Ye Weiji Chen Ning Lin Jianwei Li | 2014 | Journal of Traditional Chinese Medicine2014，34，3： | 1 |
| 11 | Diesel engine noise source identification based on EEMD, coherent power spectrum analysis and improved AHP显示文摘 | ZHANG Junhong WANG Jian LIN Jiewei | 2015 | Measurement Science and Technology2015，26，： | 1 |
| 12 | An Analysis of the Factors Influencing Cavitation in the Cylinder Liner of a Diesel Engine显示文摘Avoiding cavitation inside the water jacket is one of the most important issues regarding the proper design of a diesel engine’s cylinder liner.Using CFD simulations conducted in the frame of a mixture multiphase approach,a moving grid technology and near-wall cavitation model,in the present study the factors and fluid-dynamic patterns that influence cavitation are investigated from both macroscopic and mesoscopic perspectives.Several factors are examined,namely:wall vibration,water jacket width,initial cavitation bubble radius,coolant temperature,and number of bubbles.The results show that reducing the cylinder liner vibration intensity can significantly weaken the cavitation.Similarly,increasing the water jacket width is instrumental in avoiding cavitation.Increasing the coolant temperature reduces the microjet velocity related to bubble collapse,while increasing the number of bubbles produces a much larger water hammer pressure that can cause more damage to the cylinder liner. | Dehui Tong Shunshun Qin Quan Liu Yuhan Li Jiewei Lin | 2022 | Fluid Dynamics & Materials Processing2022，18，6： | 0 |
| 13 | Photoexcitation dynamics and energy engineering in supramolecular doping of organic conjugated molecules显示文摘Doping and blending strategies are crucial means to precisely control the excited states and energy level in conjugated molecular systems.However,effective models and platforms are rarely proposed to systematically explore the effects of the formation of trapped doped centers on heterogeneous structures,energy level and ultrafast photophysical process.Herein,for deeply understanding the impact of molecular doping in film energy levels and photoexcitation dynamics,we set a supramolecular N-B coordination composed by the conjugated molecules of pyridine functionalized diarylfluorene(host material),named as ODPF-Phpy and ODPF-(Phpy)2,and the molecule of tris(perfluorophenyl)borane(BCF)(guest material).The generation of the molecular-level coordination bond increased the binding energy of N atoms and tuned the band-gap,leading to a new fluorescent emission center with longer excitation wavelength and emission wavelength.The intermolecular Forster resonance energy transfer(FRET)in blending flms make it present inconsistent fluorescent behaviors compared to that in solution.The charge transfer(CT)state of N-B coordinated compounds and the changed dielectric constant of blending films resulted in a large PL spectra red-shift with the increased dopant ratio,causing a wide-tunable fluorescent color.The excited state behaviors of two compounds in blending system was further investigated by the transient absorption(TA)spectroscopy.Finally,we found supramolecular coordination blending can effectively improve the films'photoluminescence quantum yield(PLQY)and conductivity.We believe this exploration in the internal coordination mechanisms would deepen the insights about doped semiconductors and is helpful in developing novel high-efficient fluorescent systems. | Xiang An Chuanxin Wei Lubing Bai Jun Zhou Le Wang Yamin Han Lili Sun Jinyi Lin Heyuan Liu Jiewei Lil Man Xu Haifeng Ling Linghai Xie Wei Huang | 2023 | Light(Science & Applications)2023，12，2： | 0 |
| 14 | Green-synthesized,low-cost tetracyanodiazafluorene(TCAF) as electron injection material for organic light-emitting diodes显示文摘Two electron-deficient azaacenes including di-and tetra-cyanodiazafluorene(DCAF and TCAF)with the advantages of deep lowest unoccupied molecular orbital(LUMO),green-synthesis,low-cost,simply purification method,excellent yields have been obtained,characterized and used as electron injection materials(EIMs)in three groups of electroluminescence devices.Device B with TCAF as EIM exhibited the best performance including turn-on voltage of 5.0 V,stronger maximum luminance intensity of 31,549 cd/m2,higher luminance efficiency of 62.34 cd/A and larger power efficiency of 21.74 lm/W which are 0.53,6.7,9.3 and 15.3 times than that of device A with DCAF as EIMs,respectively.The enhanced interfacial electron injection ability of TCAF than that of DCAF is supported by its better electron mobility in electron-only device,deeper LUMO(-4.52 eV),and stronger electronic affinity.Best external quantum efficiency of 16.56%was achieved with optimized thicknesses of TCAF as EIM and TPBi as electron transporting layer.As a new comer of acceptor family,TCAF would push forward organic electronics with more fascinating and significant applications. | Bing Yang Jianfeng Zhao Zepeng Wang Zhenlin Yang Zongqiong Lin Yanni Zhang Jiewei Li Linghai Xie Zhongfu An Hongmei Zhang Jiena Weng Wei Huang | 2019 | Chinese Chemical Letters2019，30，11： | 0 |
| 15 | 人工智能白内障协同管理的通用平台显示文摘目的:建立和验证一个涉及多级临床场景的白内障协作通用的人工智能(artificial intelligence,AI)管理平台,探索基于AI的医疗转诊模式,以提高协作效率和资源覆盖率。方法:训练和验证的数据集来自中国AI医学联盟,涵盖多级医疗机构和采集模式。使用三步策略对数据集进行标记:1)识别采集模式;2)白内障诊断包括正常晶体眼、白内障眼或白内障术后眼;3)从病因和严重程度检测需转诊的白内障患者。此外,将白内障AI系统与真实世界中的居家自我监测、初级医疗保健机构和专科医院等多级转诊模式相结合。结果:通用AI平台和多级协作模式在三步任务中表现出可靠的诊断性能:1)识别采集模式的受试者操作特征(receiver operating characteristic curve,ROC)曲线下面积(area under the curve,AUC)为99.28%~99.71%);2)白内障诊断对正常晶体眼、白内障或术后眼,在散瞳-裂隙灯模式下的AUC分别为99.82%、99.96%和99.93%,其他采集模式的AUC均>99%;3)需转诊白内障的检测(在所有测试中AUC>91%)。在真实世界的三级转诊模式中,该系统建议30.3%的人转诊,与传统模式相比,眼科医生与人群服务比率大幅提高了10.2倍。结论:通用AI平台和多级协作模式显示了准确的白内障诊断性能和有效的白内障转诊服务。建议AI的医疗转诊模式扩展应用到其他常见疾病和资源密集型情景当中。 | WU Xiaohang HUANG Yelin LIU Zhenzhen LAI Weiyi LONG Erping ZHANG Kai JIANG Jiewei LIN Duoru CHEN Kexin YU Tongyong WU Dongxuan LI Cong CHEN Yanyi ZOU Minjie CHEN Chuan ZHU Yi GUO Chong ZHANG Xiayin WANG Ruixin YANG Yahan XIANG Yifan CHEN Lijian LIU Congxin XIONG Jianhao GE Zongyuan WANG Dingding XU Guihua DU Shaolin XIAO Chi WU Jianghao ZHU Ke NIE Danyao XU Fan LV Jian CHEN Weirong LIU Yizhi 林浩添 无 王厚硕(审校) 罗明杰(审校) | 2023 | 眼科学报2023，38，10： | 0 |
| 16 | Macroporous and Antibacterial Hydrogels Enabled by Incorporation of Mg-Cu Alloy Particles for Accelerating Skin Wound Healing显示文摘Repair of severe skin tissue injury remains a great challenge and wound infection is still a formidable problem.In this study,new macroporous and antibacterial gelatin/alginate(SAG)-based hydrogels for wound repair were designed and developed based on in-situ gas foaming method and ion release strategy as a result of Mg-Cu particles degradation in the hydrogel matrix.The addition of Mg-Cu particles decreased the storage modulus of SAG,maintained its mechanical resilience and enhanced its water-absorbing capability.Moreover,the water vapor transmission rate of SAG added with 2 wt.%Mg-Cu(SAG-2 MC)was 124%of that of medical gauze and 804%of commercial Tegaderm^(TM)film dressing.The bacterial inhibition rates of SAG-2 MC against S.aureus.E.coli and P.aeruginosa reached 99.9%±0.1%,98.7%±1.2%and 98.0%±0.7%,respectively,significantly greater than those of the SAG hydrogel and Mg particle-modified hydrogels.In addition,SAG-2 MC hydrogel was biocompatible and promoted cell migration.In vivo experiment results indicated that SAG-2 MC significantly accelerated the skin wound healing in murine model as demonstrated by higher epidermis thickness,more collagen deposition and enhanced angiogenesis compared with SAG-OMC,SAG-2 M and TegadermTM film.In summary,Mg-Cu particles have great potential to modulate the physiochemical and biological properties of SAG hydrogels.Mg-Cu particle-modified SAG hydrogels reveal significant promise in the treatment of severe skin wound or other soft tissue lesions. | Jiewei Yin Pengcheng Xu Kang Wu Huan Zhou Xiao Lin Lili Tan Huilin Yang Ke Yang Lei Yang | 2022 | Acta Metallurgica Sinica(English Letters)2022，35，5： | 0 |
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