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Chinese Journal of Aeronautics 2022年第11期35卷 401-415页

作者： Shanyue GUAN Xiaokai WANG Lin HUA Yixuan LI Hubei Key Laboratory of Advanced Technology for automotive components Wuhan University of TechnologyWuhan 430070China Hubei Collaborative Innovation center for automotive components Technology Wuhan 430070China School of automotive Engineering Wuhan University of TechnologyWuhan 430070China

The aeroengine casing ring forgings have complex cross-section shapes,when the conventional ultrasonic or phased array is applied to detect such curved surfaces,the inspection images always have low resolution and even artifacts due to the distortion of the wave *** this article,taking a type of aeroengine casing ring forging as an example,the Total Focusing Method(TFM)algorithms for curved surfaces are ***,the Acoustic Field Threshold Segmentation(AFTS)algorithm is proposed to reduce background noise and data ***,the Vector Coherence Factor(VCF)is adopted to improve the lateral resolution of the TFM ***,a series of 0.8 mm diameter Side-Drilled Holes(SDHs)are machined below convex and concave surfaces of the *** quantitative comparison of the detection images using the conventional TFM,AFTS-TFM,VCF-TFM,and AFTS-VCF-TFM is implemented in terms of data volume,imaging Signal-to-Noise Ratio(SNR),and defect echo *** results show that compared with conventional TFM,the data volume of AFTS-VCF-TFM algorithm for convex and concave is decreased by 32.39%and 73.40%,***,the average SNR of the AFTS-VCF-TFM is gained up to 40.0 dB,while the average 6 dB-drop echo width of defects is reduced to 0.74 mm.

关键词： Aeroengine casing Acoustic Field Threshold Segmentation(AFTS) Curved surfaces Total Focusing Method(TFM) Vector Coherence Factor(VCF)

Anti-wear properties evaluation of frictional sliding interfaces in automobile engines lubricated by copper/graphene nanolubricants

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Friction 2020年第5期8卷 905-916页

作者： Mohamed Kamal Ahmed ALI Xianjun HOU Mohamed AAABDELKAREEM Hubei Key Laboratory of Advanced Technology for automotive components Wuhan University of TechnologyWuhan 430070China automotive and Tractors Engineering Department Faculty of EngineeringMinia UniversityEl-Minia 61111Egypt Hubei Collaborative Innovation center for automotive components Technology Wuhan 430070China

Owing to the significance of improving fuel economy, reducing emissions, and extending the durability of engine components, this study focused on the tribological performance of nano-additives. In this study, copper (Cu) and graphene (Gr) nanomaterials were dispersed in a fully formulated engine oil (5W-30) with different concentrations. The tribological trials were investigated under various speeds and loads, utilizing a reciprocating tribometer to mimic the ring/liner interfaces in the engine. The frictional surface morphologies were com-prehensively analyzed using electron probe X-ray microanalysis (EPMA), field emission scanning electron microscopy (FESEM), energy dispersive spectrometer (EDS), and three dimensional (3D) surface profilometry to explore the mechanisms responsible for improving the tribological performance of the frictional sliding parts in the engine. The tribological test results illustrated that lubrication by nano-additives reduced the wear rate (WR) and friction coefficient (COF) by 25%–30% and 26.5%–32.6%, respectively, as compared with 5W-30. The results showed that this is a promising approach for increasing the durability and lifespan of frictional sliding components and fuel economy in automobile engines.

关键词： engine tribology nanomaterial nanolubricant friction wear tribofilm

Interface properties and phase formation between surface coated SKD61 and aluminum alloys

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中国有色金属学会会刊：英文版 2009年第4期19卷 875-878页

作者： Se-Weon CHOI Young-Chan KIM Se-Hun CHANG Ik-Hyun OH Joon-Sik PARK Chang-Seog KANG automotive components center Korea Institute of Industrial Technology Division of Advanced Materials Engineering Hanbat National University

The intermediate phase formation and surface protection effects between SKD61 die mold alloys and aluminum alloys were investigated during a simulated die-casting *** surface coatings of SKD61 alloy were carried out via Si pack cementation coatings at 900 ℃ for 10 h and the ε-FeSi phase *** the coated SKD61 alloy was dipped in the liquid aluminum alloy(ALDC12),the surface coated SKD61 alloys showed better surface properties compared with uncoated SKD61 alloys,i.e.,the intermediate phases(FeSiAl compound) were not produced for the coated SKD61 *** coating layer of ε-FeSi served as a diffusion barrier for the formation of FeSiAl compounds.

关键词：表面涂层铝合金接口特性表面合金涂层表面保护合金生产化合物中间相

Influence of Alignment Errors on Contact Pressure during Straight Bevel Gear Meshing Process

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Chinese Journal of Mechanical Engineering 2015年第6期28卷 1089-1099页

作者： HAN Xinghui HUA Lin DENG Song LUO Qiuping Hubei Key Laboratory of Advanced Technology for automotive components School of Automotive EngineeringWuhan University of Technology

Straight bevel gears are widely applied in automotive, aerospace, chemical and many other fields as one of the most common type of gears. Currently, the researches on straight bevel gears have focused on the fields of fatigue, wear, noise and vibration, while little attention is paid to the effect of multiple alignment errors on the gear tooth wear. To study the influence of alignment errors on the gear tooth wear, a simulated model of a straight bevel gear pair is established. Then, the contact pressure on the tooth surface is analyzed under the various alignment errors according to the Archard wear relationship. The main combinations of alignment errors played vital roles on the tooth wear are investigated. The result shows that under the single alignment error, the contact pressure moves to the tooth heel and increases greatly at here when ？P=0.1 or ？G=0.1; when ？E=–0.03, the contact pressure greatly increases at the tooth heel, but it obviously increases at the tooth toe when ？E=0.03; the alignment error ？γ=1 has little effect on the contact pressure on the tooth surface. Moreover, the combination of ？P, ？G, ？E〈0 and ？γ is the most dangerous type among the multiple alignment errors. This research provides valuable guidelines for predicting the tooth wear under various alignment errors.

关键词： straight bevel gear multiple alignment errors contact pressure wear

Research on Measurement Method of Muffler Performance under High Temperature and High-Speed Airflow Conditions

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Journal of Beijing Institute of Technology 2020年第2期29卷 241-250页

作者： Liping Xie Chihua Lu Zhien Liu Yawei Zhu Hubei Key Laboratory of Advanced Technology of automotive components Wuhan University of TechnologyWuhan 430070China Hubei Collaborative Innovation center for automotive components Technology Wuhan 430070China

Ignoring the influence of flow velocity and flow temperature on muffling performance,performance tests were conducted without airflow in the development phase of the muffler which accounts to the difficulty of obtaining a perfect match between the actual noise reduction effect and the design *** on the two-load test theory,a set of high-temperature and high-speed airflow simulation measurement devices for the muffler has been *** order to avoid the impact of high-temperature and high-speed airflow on the sensor,a high temperature resistant sensor holder has been designed for the test *** sound pressure has been measured in the pipe by using the lead-out *** addition,a variable impedance load is placed at the end of the test tube to realize the switch between two different impedance loads by the wave handle of the variable impedance load.A sound source correction method is proposed to decrease the random fluctuation of the spectral characteristics of the output noise signal,which is caused by the acoustic impedance variation at the connection between the transition pipeline and the combined sound source ***,an acoustic software has been used to calculate the transmission loss of the muffler in the presence of high temperature *** comparing the experimental measurements and the simulation results,the small difference shows that:the bench not only can effectively simulate high-temperature and flow velocity environment of the engine but also accurately test the transmission loss of the muffler.

关键词： muffler lead-out measurement variable load source correction transmission loss

Numerical analysis of 3D spot continual induction hardening on curved surface of AISI 1045 steel

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Journal of Central South University 2016年第5期23卷 1152-1162页

作者：高恺汪舟秦训鹏朱生霄 Hubei Key Laboratory of Advanced Technology for automotive components (Wuhan University of Technology)

In order to investigate and predict the material properties of curved surface AISI 1045 steel component during spot continual induction hardening(SCIH),a 3D model for curved surface workpieces which coupled electromagnetic,temperature and phase transformation fields was built by finite element software ANSYS.A small size inductor and magnetizer were used in this model,which can move along the top surface of workpiece *** effect of inductor moving velocity and workpiece radius on temperature field was analyzed and the heating delay phenomenon was found through comparing the simulated *** temperature field results indicate that the heating delay phenomenon is more obvious under high inductor moving velocity *** trend becomes more obvious if the workpiece radius becomes *** predictions of microstructure and micro-hardness distribution were also carried out via this *** predicted results show that the inductor moving velocity is the dominated factor for the distribution of 100% martensite region and phase transformation *** influencing factor of workpiece radius on 100% martensite region and phase transformation region distribution is obvious under relatively high inductor moving velocity but inconspicuous under relatively low inductor moving velocity.

关键词： spot continual induction hardening curved surface heating delay phenomenon

Control Strategy Research of a Selective Catalytic Reduction System for Heavy-Duty Application

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Journal of Shanghai Jiaotong university(Science) 2017年第5期22卷 577-588页

作者：王天田林峰胡杰柯于强张岳秋 Hubei Key Laboratory of Advanced Technology for automotive components & Hubei Collaborative Innovation center for automotive components Technology Wuhan University of Technology Dongfeng Liuzhou Motor Co. Ltd. Beijing Municipal Vehicle Emission Management center

An AdBlue dosing control strategy of the selective catalytic reduction (SCR) system is developed for a heavy-duty diesel (HDD) engine. The strategy includes a raw emission prediction model, an ammonia (NH3) coverage prediction model, a transient heat hysteresis correction algorithm, an NH3 leakage control model for transient operation conditions, and a feedback controller (FBC). FBC has been developed by using mathematical manipulation to change output signal of sensor based on cross-sensitivity of nitrogen oxide (NOx) sensor to NH3. The quantification of control parameters is based on experiments and Nyquist stability criterion. FBC is enabled in most test conditions to satisfy the stability requirements. NOxconversion (DeNOx) efficiency of SCR system is 82.4% in European steady-state cycle (ESC) test and 80.3% in European transient cycle (ETC) test, while the leakage of NH3 is under 10−5volume fraction in average. © 2017, Shanghai Jiaotong University and Springer-Verlag GmbH Germany.

关键词： Nitrogen oxides Stability criteria

Influence of cutter diameter on meshing performance in spiral bevel gears

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Journal of Central South University 2016年第1期23卷 102-111页

作者：马志浩韩星会华林熊小双郑方焱 Hubei Key Laboratory of Advanced Technology for automotive components Wuhan University of Technology

Playing a critical role in transmitting movement and power, the meshing performance of spiral bevel gears has a significant effect on products' operational performance. To evaluate the meshing performance, the accurate three-dimensional(3D) spiral bevel gear models are established through the Pro/E and MATLAB softwares, and the finite element analysis(FEA) methods are applied to the theoretical investigation of the influence of cutter diameter on meshing performance in spiral bevel gears. The results obtained show that the cutter diameter has a significant influence on spiral bevel gears' meshing performance, such as the contact area, contact pressure, bending stress, torsional stiffness and transmission error.

关键词： spiral bevel gears meshing performance finite element analysis cutter diameter

Simplified Method of Simulating Double-Layer Micro-Perforated Panel Structure

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automotive Innovation 2018年第4期1卷 374-380页

作者： Wan Chen Chihua Lu Zhien Liu Songze Du Hubei Key Laboratory of Advanced Technology for automotive components Wuhan University of TechnologyWuhan 430070China Hubei Collaborative Innovation center for automotive components Technology Wuhan University of TechnologyWuhan 430070China

The micro-perforated panel(MPP)structure has been widely used in various noise control applications,and thus its acoustic performance prediction has been receiving increasing *** acoustic performance of simple MPP structures,such as a MPPsound absorber,has been predicted using an analytical calculation ***,this is not a suitable approach toward predicting the acoustic performance of complicated MPP structures,owing to the structural complexity of these ***,the many perforations of submillimeter scale diameter render the MPP structures very difficult to analyze using numerical ***,this study focused on two different simplified MPP simulation methods:the transfer admittance method and the equivalent fluid method,and their application on double-layer MPP *** on the two simplified MPP simulation methods,the transmission loss value of the double-layer MPP mufflers with two sets of different structural parameters was calculated,*** predicted results were compared with the impedance tube *** results revealed that the two simplified MPP simulation methods could effectively predict the acoustic performance of doublelayer MPP ***,the prediction based on the transfer admittance method can outperform the two simplified simulation methods.

关键词： Double-layer MPP structure Acoustic simulation Transfer admittance Porous material Experimental test

Effects of Electric and Magnetic Treatments on Microstructures of Solid Metals: A Review

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Chinese Journal of Mechanical Engineering 2023年第6期36卷 1-21页

作者： Yanli Song Wenlin Wu Yongqing Yu Lin Hua Hubei Key Laboratory of Advanced Technology for automotive components Wuhan University of TechnologyWuhan 430070China Hubei Collaborative Innovation center for automotive components Technology Wuhan University of TechnologyWuhan 430070China School of automotive Engineering Wuhan University of TechnologyWuhan 430070China Hubei Research center for New Energy&Intelligent Connected Vehicle Wuhan University of TechnologyWuhan 430070China

An external electric or magnetic field can transfer high-intensity energy directly to the electronic scale of materials,and change the spin,energy level arrangement and trajectory of *** changes produce tremendous and profound impacts on the microstructure and mechanical properties of metal materials,which may be impos-sible with traditional *** paper reviews the effects of electric or magnetic field on the microstruc-tures of solid metals including phase transformation,precipitation,recrystallization,dislocations and so *** on the existing research results,the mechanisms of these effects have been ***,some typical applications of electric and magnetic treatments on solid metals have been described and the challenges in this field have also been discussed.

关键词： Electric field Magnetic field Microstructures Mechanical properties Solid metals