检索结果-内蒙古大学图书馆

development of a new MLI for orbital cryogenic propulsion systems -thermal performance under one atmosphere to a vacuum

引用

IOP conference Series: Materials Science and engineering 2019年第1期502卷

作者： Takeshi Miyakita Kazuya Kitamoto Kiyoshi Kinefuchi Masanori Saitoh Tomoyuki Hirai Hiroyuki Sugita JAXA R&D Directorate 2-1-1 Sengen Tsukuba 305-8505 Japan JAXA Space Technology Directorate I 2-1-1 Sengen Tsukuba 305-8505 Japan Orbital Engineering Inc. 1-7-8 Nishikanagawa Kanagawa 221-0822 Japan Toska Bano'k Co. Ltd. 14 Kanda Tokyo 101-0042 Japan

The efficient storage of cryogenic propellants is among the key technologies for long-duration space exploration missions. For the orbital transfer vehicle, the required thermal insulation performance is more than ten times higher than that of conventional spray-on foam insulation. conventional multi-layer insulation blankets are used as excellent insulation for spacecraft in the vacuum environment, but are not usable in the atmospheric environment. A new type of insulation-a load-bearing, non-interlayer-contact spacer MLI (LB-NICS MLI)-has been developed. The insulation performance in both air and vacuum environments is measured with a boil-off calorimeter. According to the test results, LB-NICS MLI is about 3 times superior under 1 atmosphere and 13 times superior under a vacuum, compared to foam insulation.

关键词：

来源：评论

学校读者我要写书评

暂无评论

research on Prediction and control of Heavy commercial Vehicle Interior High Frequency Noise Based on SEA

Research on Prediction and Control of Heavy Commercial Vehic...

引用

International conference on computer technology, Electronics and communication

作者： rongjiang Tang Zhe Tong Li Huang Shenfang Li School of Mechanical & Electrical Engineering Guilin University of Electronic Technology Guilin China R&D Center of Commercial Vehicle Dong Feng Liuzhou Automobile Co. Ltd Liuzhou China

ISBN: (纸本)9781538657850

A statistical energy analysis model for predicting the noise of commercial vehicles was established in this paper. The modal density and loss factor of each subsystem were obtained by combining the calculation and test. The vibration excitation and sound excitation under various working conditions were measured. Then these basic parameters and excitation were put into the model for simulation and calculation, and the sound pressure level of driver's head sound cavity was obtained. By comparing the experimental results, the maximum error does not exceed 2dB (A), which indicates the accuracy of the SEA model for predicting noise. The energy transfer path analysis was carried out to find out the subsystems with the largest contribution of noise. Two kinds of optimized schemes were proposed and the results showed that the interior noise sound pressure can decrease by about 1.5dB (A).

关键词： Statistical energy analysis Interior noise Modal density Simulation analysis

来源：评论

学校读者我要写书评

暂无评论

research on Battery Box Lightweight Based on Material replacement

Research on Battery Box Lightweight Based on Material Replac...

引用

2017 5th International conference on Mechatronics,Materials,Chemistry and computer engineering(ICMMCCE 2017)

作者： Qiu-Sheng Chen Han Zhao Ling-Xue Kong Kang-Wei Chen School of Mechanical Engineering Hefei University of Technology Institute for Frontier Materials Deakin University New Energy Vehicle R&D Institure Anhui jianghuai automobile group co.LTD

Battery box lightweighting and stiffness are two important objectives of battery box design and improvement. In order to reduce a battery box’s weight without impairment of stiffness,a method of battery box parts’ material replacement from mild steel sheet to Aluminium alloy steel sheet of changed depth is brought forward,the selection of the appropriate material by using the material index is *** thickness change equation is drawn from structural mechanical analysis and verified by finite element simulation of body parts. Before and after the material replacement,the displacement nephogram and stress nephogram is obtained through simulation analysis of the battery box and there is no obvious difference between them show that the method presented in this paper is valid.

关键词： battery box Aluminium alloy lightweighting material replacement stiffness

来源：评论

学校读者我要写书评

暂无评论

Optimization and reformation of heat exchanger network for wax oil hydrocracking unit by pinch technology and exergy analysis

引用

Huagong Jinzhan/Chemical Industry and engineering Progress 2017年第4期36卷 1231-1239页

作者： Li, Zhonghua Xiao, Wu He, Gaohong du, Yanze Fang, Xiangchen Luo, Li State Key Laboratory of Fine Chemicals R&D Center of Membrane Science and Technology Dalian University of Technology DalianLiaoning116024 China Fushun Research Institute of Petroleum and Petrochemicals FushunLiaoning113001 China Beijing Worley Parsons Engineering Technology Co. Ltd. Beijing100015 China

A wax oil hydrocracking process unit with annual capacity of 1.5 million tons in a refinery was simulated using Aspen Plus. The unit included single segment series, cold high pressure column, and light hydrocarbon absorber vacuum tower. Based on the basic production data of wax oil hydrocracking units, Aspen Plus software was used to establish a strict mathematical model for each module in the process. By adjusting the model parameters, the simulation results and calibration data were in a good agreement. Then thermodynamic parameters of different streams were obtained from the simulation. Based on the simulation, the "bottleneck" of the heat exchanger network for the process was identified using pinch analysis., With the premise of not changing the main equipment of the system, the tuning and simulation of the existing heat exchanger network were achieved for the energy-saving program. The effective energy analysis method was also used to evaluate the heat exchange network before and after the reformation. After the tuning, the amount of hot utility was the 25709kW that is 42.2% less than original process;the amount of cold utility was 29863kW that was 38.5% less than the original process. Overall, the transformation program would save energy 17.19kgEO/t total exergy loss of the heat exchanger network would be reduced to 8477kW from 13530kW with the total exergy loss decreased by 37.35%. © 2017, Chemical Industry Press. All right reserved.

关键词： Heat exchangers

来源：评论

学校读者我要写书评

暂无评论

Effect of impurity phase on corrosion resistance and magnetic entropy change for LaFe_(11.3)co_(0.4)Si_(1.3)C_(0.15) magnetocaloric compound

引用

Journal of rare Earths 2016年第3期34卷 283-287页

作者：胡洁付松霍岩龙毅薛佳宁 College of Continuing Education Shijiazhuang Tiedao University School of Materials Science and Engineering University of Science and Technology Beijing Technique R&D Center Haier Group Tianjin Long March Launch Vehicle Manufacturing Co. Ltd.

Effect of impurity phase（α-Fe phase and La-rich phase） on corrosion resistance and magnetic entropy change of LaFe_（11.3）co_（0.4）Si_（1.3）C_（0.15） compound was studied using scanning electron microscopy, potentiodynamic polarization, electrochemical impedance spectroscopy techniques and magnetism testing. With the decrease of impurity phase, the corrosion resistance of LaFe_（11.3）co_（0.4）Si_（1.3）C_（0.15） compound was first enhanced and then slightly impaired. corrosion resistance could be significantly improved by the decrease of α-Fe phase. However, the matrix phase was corroded if the La-rich phase as anode was too few. This caused the corrosion resistance to decrease slightly. After immersing the sample in distilled water for 15 d, -？S_（max） of the samples annealed for 3, 12 h, 3 and 7 d decreased about 50%, 41%, 16% and 17%, respectively.

关键词： magnetic materials corrosion behavior magnetic entropy change rare earths

来源：评论

学校读者我要写书评

暂无评论

Analysis and research on grounding contact performance of radial tire

引用

AIP conference Proceedings 2019年第1期2154卷

作者： Shuiting Zhou Meng du Pengfei Sun Xiao Han Jie Zhu 1School of Mechanical & Automotive Engineering Xiamen University of Technology Xiamen 361024 China 2Fujian Collaborative innovation center for R&D of coach and special vehicle Xiamen 361024 China 3Fujian key laboratory of advanced design and manufacture for bus$coach Xiamen 361024 China 4School of Aerospace Engineering Xiamen University Xiamen 361005 China 5Wanli Tire Co. Ltd Guangzhou 510940 China

The grounding performance of tires under different tire pressure and load was tested by using the five rigid test machine and the TireScan pressure distribution measurement system, the test results show that the tire pressure and load have obvious influence on the grounding performance of the tire. At the same time, using ABAQUS software to simulate the relationship between different sinking amount and belt layer angle and tire grounding performance, the analysis results show that the sinking amount and the belt layer angle are closely related to the grounding performance of the tire.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Multi-body dynamic simulation research on the influence of piston engine crankshaft thrust bearings abrasion

引用

High technology Letters 2016年第4期22卷 426-435页

作者：么子云 Jiang Zhinong Li Xin Jia Yang Zhang Jinjie Diagnosis and Self-Recovery Engineering Research Center Beijing University of Chemical Technology Safety Detection and Intelligent System R&D of Beijing Rail Transit Engineering Research Center Beijing Rail and Transit Design & Research Institute CO.LTD

Fault diagnosis studying on piston engine,crankshaft and gearbox is focused in this paper. The thrust bearing abrasion caused by axial movement of the crankshaft will affect the force of timing gears and oil pump gears,which will result in the fracture of gears,abnormal ignition,connecting rod cracking and collision of cylinder. Simulation based on CrEO software is done to build three-dimensional models of crankshaft and gears of a WP10 diesel engine. The models are imported into AdAMS to complete multi-body dynamics simulations. The force analysis of gears in different kinds of axial movements is finished and variations rules of gear dynamic load is obtained. The presented results show that the crankshaft axial movement can cause overload and vibration on gears. combined with the realistic case data,the fault feature through simulation research is validated and early warming parameters of gear fault are proposed.

关键词： crankshaft piston engine axial movement gear multi-body simulation

来源：评论

学校读者我要写书评

暂无评论

Advancing image understanding in poor visibility environments: A collective benchmark study

arXiv

引用

arXiv 2019年

作者： Yang, Wenhan Yuan, Ye ren, Wenqi Liu, Jiaying Scheirer, Walter J. Wang, Zhangyang Zhang, Taiheng Zhong, Qiaoyong Xie, di Pu, Shiliang Zheng, Yuqiang Qu, Yanyun Xie, Yuhong Chen, Liang Li, Zhonghao Hong, Chen Jiang, Hao Yang, Siyuan Liu, Yan Qu, Xiaochao Wan, Pengfei Zheng, Shuai Zhong, Minhui Su, Taiyi He, Lingzhi Guo, Yandong Zhao, Yao Zhu, Zhenfeng Liang, Jinxiu Wang, Jingwen Chen, Tianyi Quan, Yuhui Xu, Yong Liu, Bo Liu, Xin Sun, Qi Lin, Tingyu Li, Xiaochuan Lu, Feng Gu, Lin Zhou, Shengdi Cao, cong Zhang, Shifeng Chi, Cheng Zhuang, Chubin Lei, Zhen Li, Stan Z. Wang, Shizheng Liu, ruizhe Yi, dong Zuo, Zheming Chi, Jianning Wang, Huan Wang, Kai Liu, Yixiu Gao, Xingyu Chen, Zhenyu Guo, Chang Li, Yongzhou Zhong, Huicai Huang, Jing Guo, Heng Yang, Jianfei Liao, Wenjuan Yang, Jiangang Zhou, Liguo Feng, Mingyue Qin, Likun Wangxuan Institute of Computer Technology Peking University Beijing100080 China Department of Computer Science and Engineering Texas A&M University TX77843 United States State Key Laboratory of Information Security Institute of Information Engineering Chinese Academy of Sciences Department of Computer Science and Engineering University of Notre Dame Notre DameIN46556 United States Department of Mechanical Engineering Zhejiang University Hangzhou310027 China Hikvision Research Institute Hangzhou310051 China Mtlab Meitu Inc. Beijing100080 China Insitute of Information Science Beijing Jiaotong University Beijing100044 China Department of Computer Science and Technology Tongji University Shanghai201804 China XPENGMOTORS Beijing China School of Computer Science and Engineering at South China University of Technology Guangzhou510006 China Tencent AI Lab Shenzhen518000 China Institute of Automation Chinese Academy of Sciences Beijing100190 China Northeastern University Shenyang110819 China Nanyang Technological University Singapore639798 Big Data Center State Grid Corporation of China Beijing China Winsense Inc. Beijing100080 China University of Chinese Academy of Sciences Beijing100049 China Department of Informatics Technical University of Munich Garching85748 Germany Institute of Microelectronics Chinese Academy of Sciences Beijing100190 China China Electric Power Research Institute Beijing100031 China Westlake University Hangzhou310024 China Department of Computer Science Durham University Durham United Kingdom Australian National University ActonACT0200 Australia Sunway-AI Co. Ltd Zhuhai China Chinese Academy of Sciences R&D Center for Internet of Things Wuxi214200 China

Existing enhancement methods are empirically expected to help the high-level end computer vision task: however, that is observed to not always be the case in practice. We focus on object or face detection in poor visibility enhancements caused by bad weathers (haze, rain) and low light conditions. To provide a more thorough examination and fair comparison, we introduce three benchmark sets collected in real-world hazy, rainy, and lowlight conditions, respectively, with annotated objects/faces. We launched the UG2+challenge Track 2 competition in IEEE CVPr 2019, aiming to evoke a comprehensive discussion and exploration about whether and how low-level vision techniques can benefit the high-level automatic visual recognition in various scenarios. To our best knowledge, this is the first and currently largest effort of its kind. Baseline results by cascading existing enhancement and detection models are reported, indicating the highly challenging nature of our new data as well as the large room for further technical innovations. Thanks to a large participation from the research community, we are able to analyze representative team solutions, striving to better identify the strengths and limitations of existing mindsets as well as the future directions. copyright © 2019, The Authors. All rights reserved.

关键词： Object detection

来源：评论

学校读者我要写书评

暂无评论

Static Structural Analysis of 2MW Wind Turbine Blade Based on ANSYS Workbench

Static Structural Analysis of 2MW Wind Turbine Blade Based o...

引用

2017 2nd International conference on Test, Measurement and computational Method(TMCM 2017)

作者： Z.K.HE J.CAI S.S.CUI W.C.LIU B.W.LIU Y.d.WANG School of Nuclear Science and Engineering North China Electric Power University Blade Department of R&D Institute of Guo Dian Wind Power Technology Guodian United Power Technology Co.Ltd State Key Laboratory of Metal Materials Beijing University Science and Technology

In this paper, finite element software ANSYS Workbench is used in the static structural analysis of a kind of 2MW wind turbine blade. The results show that under the maximum possible load, the finite element model of the blade is within the safe range. But relatively speaking, the beam and the trailing edge are relatively bearing larger stress and more dangerous.

关键词： Static structural analysis Wind turbine blade ANSYS Workbench

来源：评论

学校读者我要写书评

暂无评论

Study on Forming technology of TBM disc Cutter ring

引用

Journal of Physics: conference Series 2019年第3期1345卷

作者： Yong Hu Maosen Li Zhongguo Fu Yikai Hu Aiwu Zhang Changye Cao Key Laboratory of CNC Equipment Reliability Ministry of Education Jilin University Changchun Jilin Changchun 130022 China School of Mechanical and Aerospace Engineering Jilin University Changchun Jilin Changchun 130022 China Faw Jiefang Automotive Company Changchun Jilin Changchun 130011 China College of Automotive Engineering Changchun Jilin Changchun 130022 China Key Laboratory of Cutting Tool Technology of Shield and Tunnelling of Jilin Province Jilin Welter tunnel equipment Co. Ltd. Changchun Jilin Changchun 132000 China Overall R&D department CRRC Changchun Railway Vehicles Co. Ltd. Changchun Jilin Changchun 130062 China

The tunnels and underground projects bring an unprecedented development of hard rock tunneling technology. The forming process and material properties of the 20 inch disc cutter ring has been studied by the finite element simulation and test methods. The effects of blank size, blank heating temperature, mold preheating temperature and friction coefficient on the forming load, minimum surface temperature and blank deformation uniformity of 20 inch cutter ring were analyzed. The results show the optimum combination of the forming process of the 20 inch disc cutter ring is when the blank height is 90 mm, the blank heating temperature is 1200 °C, the preheating temperature is 280 °C, and the friction coefficient is 0.2. compression test and hardness test were carried out on the edge material of the cutter ring. The test results show that when the temperature exceeds 600 °C, the hardness and compressive strength of the cutter ring material will drop sharply. Therefore, the TBM should be properly cooled during construction. The research results in this paper can provide a basis for the optimization of TBM disc cutter ring processing technology and engineering applications.

关键词：

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：