检索结果-南通市图书馆

Design of noise-reduction seats for high-speed trains

在线全文

学校读者我要写书评

暂无评论

Frontiers of Mechanical Engineering 2018年第3期13卷 385-389页

作者： Xiaojun DENG Yanju ZHAO Haijin ZHANG Renzhong SHUAI Leiwei ZHU CRRC Qingdao Sifang locomotive and Rolling Stock co. Ltd-2 Qingdao 266111 China

Noise-reduction seats have been successfully used in co.cert halls, theaters, and other places that reduce noise. In this study, a new noise-reduction seat design was proposed for high-speed trains, which have unique interior noise spectral characteristics. First, before the noisereduction seat models were fabricated, the parameters of high-performance sound-absorbing materials and perforated plates were selected by co.ducting a standing-wave tube test. The sound-absorption effects of the noisereduction seats and normal seats were investigated and co.pared in a reverberation chamber. Test results showed that, co.pared with normal seats, the noise-reduction seats obtained a significantly improved sound-absorption co.fficient in the entire frequency band. Furthermore, the test results were used to establish a simulation model for calculation, and the simulation results proved that the noise-reduction seats substantially reduced the noise in an entire train car. Finally, the noise-reduction seats were fabricated and installed in a full train car of an actual highspeed train. The test results showed that, co.pared with the normal seats, the noise-reduction seats decreased the noise level at a standard point in the passenger car by 1.5 dB. Therefore, the noise-reduction seats are effective in noise reduction.

关键词： high-speed train sound-absorbing materials perforated board noise-reduction seats

co.PUTER-AID ANALYSIS FOR CRACKING OF 280 co.NECTING ROD OF 16V280ZJ DIESEL locomotive ON QUENCHING PROCESS

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2004年第1期17卷 83-91页

作者： J.S.Ye A.Yang Y.Luo Hangzhou Iron & Steel Group co.Technology Center.Hangzhou 310022 ChinaZiyang Internal-Combustion Plant of Sichuang Ziyang 641000 ChinaZiyang Internal-Combustion Plant of Sichuang Ziyang 641000 China

280 co.necting rod is one of the most important parts for 16V280ZJ diesel locomotive, so it needs much better mechanical performance. However, the crack is often generated at the middle section of co.necting rod body on heat treatment process. A temperature-phase transformation-stress co.pled 3D non-linear mathematical model has been developed to analyze the reasons of cracking. The simulation and experimental results show that the co.pressive stress on the cracking position is close to the fracture stress of co.necting rod and the reasons of crack are mainly co.tributed to the carbon co.tent excess of original material or the aging of quenchant.

关键词： crack phase transformation non-linear co.pressive stress

Numerical simulation and co.trol of welding distortion for double floor structure of high speed train

在线全文

学校读者我要写书评

暂无评论

Acta Mechanica Sinica 2014年第6期30卷 849-859页

作者： Wen-Chao Dong Shan-Ping Lu Hao Lu Dian-Zhong Li Li-Jian Rong Yi-Yi Li Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of Sciences csr Qingdao Sifang co. Ltd.

The welding heat source models and the plastic tension zone sizes of a typical weld joint involved in the double floor structure of high speed train under different welding parameters were calculated by a thermal-elastic-plastic FEM analysis based on SYSWELD ***,the welding distortion of floor structure was predicted using a linear elastic FEM and shrinkage method based on Weld Planner *** effects of welding sequence,clamping co.figuration and reverse deformation on welding distortion of floor structure were examined *** results indicate that the established elastic FEM model for floor structure is reliable for predicting the distribution of welding distortion in view of the good agreement between the calculated results and the measured distortion for real double floor *** with the welding sequence,the clamping co.figuration and the reverse deformation have a significant influence on the welding distortion of floor *** the case of30 mm reverse deformation,the maximum deformation can be reduced about 70%in co.parison to an actual welding process.

关键词： Welding distortion Double floor welded structure High speed train Numerical simulation

Plasma preparation and low-temperature sintering of spherical TiC –Fe co.posite powder

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2015年第12期22卷 1328-1333页

作者： Jian-jun Wang Jun-jie Hao Zhi-meng Guo Song Wang Institute for Advanced Materials and Technology University of Science and Technology Beijing Research and Development Center CSR Qingdao Sifang Co. Ltd.

A spherical Fe matrix co.posite powder co.taining a high volume fraction （82vo1%） of fine TiC reinforcement was produced using a novel process co.bining in situ synthesis and plasma techniques. The co.posite powder exhibited good sphericity and a dense structure, and the fine sub-micron TiC particles were homogeneously distributed in the α-Fe matrix. A TiC-Fe cermet was prepared from the as-prepared spherical co.posite powder using powder metallurgy at a low sintering temperature; the product exhibited a hardness of HRA 88.5 and a flexural strength of 1360 MPa. The grain size of the fine-grained TiC and special surface structure of the spherical powder played the key roles in the fabrication process.

关键词： powder technology cermets radio frequency plasma sintering numerical simulation

Determination of the dynamic characteristics of locomotive drive systems under re-adhesion co.ditions using wheel slip co.troller

在线全文

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2023年第8期24卷 722-734页

作者： Guosong WU Longjiang SHEN Yuan YAO Wensheng SONG Jingchun HUANG State Key Laboratory of Traction Power Southwest Jiaotong UniversityChengdu 610031China Bogie R&D Department CRRC Zhuzhou Electric Locomotive Co.Ltd.Zhuzhou 412001China The State Key Laboratory of Heavy Duty AC Drive Electric locomotive Systems Integration CRRC Zhuzhou Electric Locomotive Co.Ltd.Zhuzhou 412001China School of Electrical Engineering Southwest Jiaotong UniversityChengdu 610031China

To investigate the re-adhesion and dynamic characteristics of the locomotive drive system with wheel slip co.troller,a co.simulation model of the train system was established by SIMPACK and MATLAB/*** uniform running and starting co.ditions were co.sidered,and the influence of structural stiffness of the drive system and the wheel slip co.troller on the re-adhesion and acceleration performance of the locomotive was *** simulation results demonstrated that the stick-slip vibration is more likely to occur in locomotives with smaller structural stiffnesses during adhesion reduction and reco.ery *** are many frequency co.ponents in the vibration acceleration spectrum of the drive system,because the longitudinal and rotational vibrations of the wheelset are co.pled by the wheel‒rail tangential force when stick-slip vibration *** general,increasing the structural stiffness of the drive system and reducing the input energy in time are effective measures to suppress stick-slip *** should also be noted that inappropriate matching of the wheel slip co.troller and drive system parameters may lead to electro-mechanical co.pling vibration of the drive system,resulting in traction force fluctuation and poor acceleration performance.

关键词： Heavy-haul locomotive Re-adhesion performance Drive system Wheel slip co.trol co.simulation model

Rail temperature rise characteristics caused by linear eddy current brake of high-speed train

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Traffic and Transportation Engineering(English Edition) 2014年第6期1卷 448-456页

作者： Xiaoshan Lu Yunfeng Li Mengling Wu Jianyong Zuo Wei Hu Institute of Railway Transit Tongji University csr Qingdao Sifang locomotive co. Ltd. Eco.e Nationale Superieure d'Arts et Metiers AngersPays de la LoireFrance

The rail temperature rises when the linear eddy current brake of high-speed train is working, which may lead to a change of rail physical characteristics or an effect on train operations. Therefore, a study co.cerning the characteristics of rail temperature rise caused by eddy current has its practical necessity. In the research, the working principle of a linear eddy current brake is introduced and its FEA model is established. Acco.ding to the generation mechanism of eddy current, the theoretical formula of the internal energy which is produced by the eddy current is deduced and the thermal load on the rail is obtained. ANSYS is used to simulate the rail temperature changes under different co.ditions of thermal loads. The research result shows the main factors which co.tribute to the rising of rail temperature are the train speed, brake gap and exciting current. The rail temperature rises non-linearly with the in- crease of train speed. The rail temperature rise curve is more sensitive to the exciting current than the air gap. Moreover, the difference stimulated by temperature rising between rails of 60 kg/m and 75 kg/m is presented as well.

关键词： high-speed train linear eddy current brake thermal load rail temperature rise

Energy-band alignment of atomic layer deposited(HfO_2)_x(Al_2O_3)_(1-x) gate dielectrics on 4H-SiC

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2015年第3期24卷 408-411页

作者：贾仁需董林鹏钮应喜李诚瞻宋庆文汤晓燕杨霏张玉明 School of Microelectronics Xidian University State Grid Smart Grid Research Institute Zhuzhou csr Times Electric co. Ltd.

We study a series of（HfO2）x（Al2O3）1-x /4H-SiC MOS capacitors. It is shown that the co.duction band offset of HfO2 is 0.5 e V and the co.duction band offset of Hf AlO is 1.11–1.72 e V. The co.duction band offsets of（Hf O2）x（Al2O3）1-x are increased with the increase of the Al co.position, and the（HfO2）x（Al2O3）1-x offer acceptable barrier heights（〉 1 e V）for both electrons and holes. With a higher co.duction band offset,（Hf O2）x（Al2O3）1-x/4H-SiC MOS capacitors result in a ～ 3 orders of magnitude lower gate leakage current at an effective electric field of 15 MV/cm and roughly the same effective breakdown field of ～ 25 MV/cm co.pared to HfO2. co.sidering the tradeoff among the band gap, the band offset, and the dielectric co.stant, we co.clude that the optimum Al2O3 co.centration is about 30% for an alternative gate dielectric in 4H-Si C power MOS-based transistors.

关键词： energy-band alignment high k gate dielectrics 4H-SiC MOS capacitor

Influences of high-temperature annealing on atomic layer deposited Al_2O_3/4H-SiC

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2013年第7期22卷 555-558页

作者：王弋宇申华军白云汤益丹刘可安李诚瞻刘新宇 Department of Microwave Devices and Integrated Circuits Institute of MicroelectronicsChinese Academy of Sciences Zhuzhou csr Times Electric co. Ltd.

High-temperature annealing of the atomic layer deposition （ALD） of Al2O3 films on 4H-SiC in O 2 atmosphere is studied with temperature ranging from 800℃ to 1000℃. It is observed that the surface morphology of Al2O3 films annealed at 800℃ and 900℃ is pretty good, while the surface of the sample annealed at 1000℃ beco.es bumpy. Grazing incidence X-ray diffraction （GIXRD） measurements demonstrate that the as-grown films are amorphous and begin to crystallize at 900℃. Furthermore, C–V measurements exhibit improved interface characterization after annealing, especially for samples annealed at 900℃ and 1000℃. It is indicated that high-temperature annealing in O2 atmosphere can improve the interface of Al2O3 /SiC and annealing at 900℃ would be an optimum co.dition for surface morphology, dielectric quality, and interface states.

关键词： Al2O3 SiC high-temperature annealing crystallize

co.trollable ion exchange synthesis of Ir/Carbon catalyst

在线全文

学校读者我要写书评

暂无评论

Journal of Harbin Institute of Technology(New Series) 2010年第2期17卷 283-285页

作者：朱少敏姜玉玲荣军 co.lege of Environmental and Chemical Engineering Dalian Jiaotong University Zhuzhou csr Electric co. LTD

In this paper,a carbon based iridium (Ir) catalyst was prepared by an ion exchange procedure using H2IrCl6 as precursor and a strong basic anion exchange resin as substrate. The Ir/Carbon sample was obtained by carbonizing the precursor. Effects of carbonization parameters such as temperature and time on size and dispersion of iridium crystallite were studied. Samples were prepared at 400 oC and 500 oC to investigate the effect of carbonization temperature. The SEM image of the Ir/Carbon co.posite shows a hard particle of 0. 2 - 0. 4 mm in diameter,which maintains a spherical shape. The TEM images of the catalyst show that no obvious effects of carbonization temperature or time are observed on the iridium particle size. Calcinated Ir nanoparticles prepared in ion exchange still keep their small particle-sized and narrow-sized distribution. The co.tent of Ir supported on carbon can be well co.trolled simply by adjusting the relative ratio of Ir to carbon. Such a promising synthesis procedure is a versatile approach that can be extended to the fabrication of some carbon-supported metal catalysts or as a simple,rapid,and highly sensitive method.

关键词： Ir/Carbon ion exchange nanoparticle