检索结果-内蒙古大学图书馆

SSRN 2022年

作者： Wang, Li Hu, Wende Shang, Zhou Cao, Xiaoming Guo, Yun Li, Jiayi Gu, Qiyuan Li, Ke Li, Xiaobo Key Laboratory for Advanced Materials Research Institute of Industrial Catalysis School of Chemistry & Molecular Engineering East China University of Science and Technology Shanghai200237 China GRINM Resources and Environment Tech. Co. Ltd. Beijing101407 China Shanghai Marine Diesel Engine Research Institute Shanghai200090 China

Enhancement in oxidation performance of Co 3 O 4 -based catalysts can be achieved by regulating K, and the promotion effects were strongly depended on the amount and existing state of K. Only the surface Co substituted by optimum amount of K (CoK 2 with K/Co mole ratio of 1.56×10 -2 ), unexpectedly high activities could be achieved. The specific activity of CoK 2 were 20 and 2.7 times higher than that of Co 3 O 4 for CO oxidation and CH 4 combustion. However, the excess K in the form of carbonate or nitrate deactivated the active sites, so the performance against K amount behaved as a volcano curve. Based upon the electronic and structural modification of K, the electron density of Co and O simultaneously decreased which weakened CO adsorption strength and improved the C-H bond activation. Since efficiency in various pollutants removal, CoK 2 could be considered as a promising candidate for noble metal catalysts. © 2022, The Authors. All rights reserved.

关键词： Combustion

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Characterization and Functional Evaluation of Surface Texture of Micro Eccentric Shaft Based on Multi-index

Research Square

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Research Square 2021年

作者： Cheng, Minghui Jiao, Li Yan, Pei Niu, Zhongke Qiu, Tianyang Wang, Xibin Zhang, Baorong Key Laboratory of Fundamental Science for Advanced Machining Beijing Institute of Technology Beijing100081 China Aerospace System Engineering Shanghai Shanghai201108 China Shanxi Diesel Engine Industry Co. Ltd Shanxi037000 China

Micro eccentric shaft has important application in many high-tech fields because of its small specific gravity, material and energy saving. The surface texture generated during processing has an indispensable influence on the surface integrity and the final functional capability. However, due to the micro scale and weak rigidity, it is difficult to characterize the surface texture and evaluate the functionality by traditional quantitative parameters. In order to comprehensively realize the surface texture characterization and functional analysis, a mathematical model is established to analyze the surface texture machined with different cutting tools. The machining deformation of the micro eccentric shaft machined during turn-milling with different cutting tools is compensated. Then the surface microscopic profile and functional performance of the surface texture are analyzed by amplitude distribution function (ADF) and bearing area curve (BAC), and the surface texture is also evaluated by fractal dimension, which can avoid the effect of scale and resolution. Furthermore, power spectrum density (PSD) is utilized to analyze the relationship between the process dynamic state and geometrical specification of the surface texture. It is shown that the microscopic height distribution of surface machined by flat end milling cutter tends to be more random and there are more microscopic geometric features than that of the ball end milling cutter. The machined surface obtained by the flat end milling cutter has better load bearing, wear resistance and liquid retention capability. © 2021, CC BY.

关键词： Cutting tools

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THEORETICAL INVESTIGATION OF SOUND INSULATION OF ASYMMETRIC COUPLED-MEMBRANE ACOUSTIC METAMATERIALS

THEORETICAL INVESTIGATION OF SOUND INSULATION OF ASYMMETRIC ...

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The 2019 Symposium on Piezoelectricity,Acoustic Waves and Device Applications(2019(第14届)全国压电和声波理论及器件技术研讨会)

作者： Ding TONG Hong-yan TIAN Yan-li ZHANG Xin LI Science and Technology on Diesel Engine Turbocharging Laboratory Tianjin China School of Mechanical Engineering Hebei University of Technology Tianjin China

ISBN: (数字)9781728152530

ISBN: (纸本)9781728152547

Being as simple and lightweight structure in controlling low frequency noise,membrane-type acoustic metamaterial has been paid more *** this paper,theoretical model and analytical approach are presented to study the low frequency transmission loss performances of coupled-membrane type acoustic metamaterial(CMAM).The influences of the symmetric and asymmetric structures on the noise attenuation characteristics are *** results demonstrate that asymmetric structure of CMAM is an ideal sound insulation *** choosing proper material properties,multi-frequency and broad band sound insulation can be get in low frequency range (< 1000Hz).

关键词： Acoustic metamaterials Elastic membrane Asymmetric Low frequency

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Evolution Analysis of Process-induced Residual Stress During the Manufacture of diesel Body

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Research Square 2021年

作者： Zhao, Donghao Ai, Zhuhua Liu, Yunlong Li, Guochao Zhou, Honggen Bai, Xiaoxiang Cao, Liping School of Mechanical Engineering Jiangsu University of Science and Technology Jiangsu Zhenjiang212003 China Jiangsu Provincial Key Laboratory of Advanced Manufacturing for Marine Mechanical Equipment Jiangsu University of Science and Technology Jiangsu Zhenjiang212003 China Shaanxi Diesel Engine Heavy Industry Co. Ltd Shaanxi Xingping713105 China

Residual stress is most likely to cause deformation in a diesel body (DB). The traditional independent analysis method is no longer suitable for obtaining the residual stress of multi-process DBs, because the stress is constantly produced and changed during the casting, heat treatment, and cutting processes. Therefore, an evolution analysis method(EAM) is proposed. First, an evolution analysis model of a DB was established. Subsequently, the residual stress of the DB in the casting and heat treatment processes was analysed using ProCAST and ABAQUS. Finally, the material removal of the DB during the machining process was simulated by using ABAQUS. The residual stresses for every process were calculated by coupling inherited and process-induced stresses. Thus, the final stress distribution of the DB was deduced by considering the entire machining process. The evolution analysis of the residual stress is significant for controlling the deformation of the DB. © 2021, CC BY.

关键词： Residual stresses

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Energy science & engineering 2022年第12期10卷

作者： Rui Wang Xinyu Li Zheng Qin Lintao Wang Zhimin Lin Xuan Wang Hua Tian Gequn Shu State Key Laboratory of Engines Tianjin University China Shanghai Marine Diesel Engine Research Institute Shanghai China Department of Thermal Science and Energy Engineering University of Science and Technology of China Hefei China

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Study on through-flow model for turbine system considering three-dimensional flow field distortion effect

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International Journal of Fluid Machinery and Systems 2018年第4期11卷 432-441页

作者： Liu, Yanbin Zhuge, Weilin Zhang, Yangjun Zhang, Shuyong Department of Mechanical Engineering Academy of Armored Force Engineering Beijing100072 China State Key Laboratory of Automotive Safety and Energy Tsinghua University Beijing100084 China National Key Laboratory of Diesel Engine Turbocharging Technology Tianjin037036 China

turbocharging is an important way to raise engine power density, save energy and reduce emission. Because turbocharger is driven by exhaust gas, energy utilization rate is a key factor for turbocharged engine performance. As a part transferring heat to mechanical energy, turbine efficiency decides exhaust gas energy utilization. Because of three-dimensional flow field distortion effect at outlet to exhaust manifold, turbine efficiency will be different from MAP when engine working. Influences by interaction in turbine system, turbine efficiency will decrease. So in order to evaluate turbine operating performance and design or select turbine more precisely, it is necessary to build a through-flow model for turbine which can consider three-dimensional flow field distortion effect. Unsteady flow field distortion at outlet to turbine was analyzed and flow field interaction law between exhaust manifold and turbine was studied. On the basis, six typical flow field distortion models in an engine operation cycle were raised. Then influences six models on each flow stage in turbine were analyzed. Further, models for exhaust manifold and turbine were built separately. Difference between unsteady three-dimensional simulation result and that based on turbine system through-flow model was compared and analyzed. Research result illustrated that difference of turbine cycle efficiency was only 0.1% and difference of turbine cycle work was 0.3%. So it can be deduced that turbine system through-flow model can predict turbine operation performance precisely and help turbine system matching exactly. © 2018, Turbomachinery Society of Japan. All rights reserved.

关键词： Turbines

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Method for Evaluating the Reliability of Compressor Impeller of Turbocharger for Vehicle Application in Plateau Area

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Chinese Journal of Mechanical engineering 2016年第6期29卷 1218-1225页

作者： WANG Zheng WANG Zengquan WANG A-na ZHUANG Li WANG Jinwei Key Laboratory of Diesel Engine Turbocharging Technology China North Engine Research Institute Center of Engine Test and Measurement China North Engine Research Institute

As turbocharging diesel engines for vehicle application are applied in plateau area, the environmental adaptability of engines has drawn more attention. For the environmental adaptability problem of turbocharging diesel engines for vehicle application, the present studies almost focus on the optimization of performance match between turbocharger and engine, and the reliability problem of turbocharger is almost ignored. The reliability problem of compressor impeller of turhocharger for vehicle application when diesel engines operate in plateau area is studied. Firstly, the rule that the rotational speed of turbocharger changes with the altitude height is presented, and the potential failure modes of compressor impeller are analyzed. Then, the failure behavior models of compressor impeller are built, and the reliability models of compressor impeller operating in plateau area are developed. Finally, the rule that the reliability of compressor impeller changes with the altitude height is studied, the measurements for improving the reliability of the compressor impellers of turbocharger operating in plateau area are given. The results indicate that when the operating speed of diesel engine is certain, the rotational speed of turbocharger increases with the increase of altitude height, and the failure risk of compressor impeller with the failure modes of hub fatigue and blade resonance increases. The reliability of compressor impeller decreases with the increase of altitude height, and it also decreases as the increase of number of the mission profile cycle of engine. The method proposed can not only be used to evaluating the reliability of compressor impeller when diesel engines operate in plateau area but also be applied to direct the structural optimization of compressor impeller.

关键词： turbocharger plateau area compressor impeller failure behavior reliability

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Fatigue Reliability of Blade Root of Turbocharger Turbine for Vehicle Application

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Journal of Donghua University(English Edition) 2016年第2期33卷 277-279页

作者：任兆欣苏铁熊王正庄丽席盛 College of Mechatronic Engineering North University of China Key Laboratory of Diesel Engine Turbocharging Technology China North Engine Research Institute

The blade root fatigue is one of important failure modes of turbocharger turbine for vehicle application,and the reliability and life of turbine with blade root fatigue failure mode are ***,the stress characteristics of turbine are analyzed,and based on the operating profile of turbocharger corresponding to the endurance test of engine,the stress spectrum of turbine with blade root fatigue failure mode is studied with the simulation ***,with the number of endurance test profile cycle as the life parameter,the reliability model and failure rate model of turbine with blade root fatigue failure mode are derived respectively. Finally,the rules that the reliability and failure rate of turbine with the blade root fatigue failure mode changes as life parameters are studied,and the life probabilistic characteristics of turbine are also studied.

关键词： turbocharger for vehicle application turbine blade root fatigue reliability life

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Present situation and Countermeasures of Shanghai City disposal of restaurant kitchen garbage

Present situation and Countermeasures of Shanghai City dispo...

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2017 International Conference on Humanities science,Management and Education technology(HSMET 2017)

作者： Zhiqiang Yu Weidong Xu Chenjie Zhu Shuai Shi Ying Chen Center of Materials Science and Quality Testing Shanghai Institute of Measurement and Testing Technology Test Laboratory of Security and Crime Prevention and Information Security Products and SYstems Third Institute of the Ministry of Public Security Automation Engineering Department Shanghai Marine Diesel Engine Research Institute

This paper introduces the situation of waste characteristics and kitchen kitchen garbage disposal in Shanghai City,analyses the existing problems in processing status,expounds the kitchen garbage resource recycling technology and the prospects for development,to provide suggestions for the future of Shanghai food waste management and recycling.

关键词： kitchen waste resource management

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Performance analysis of an electric turbo compounding system for a hybrid vehicle diesel engine

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ASME Turbo Expo 2015: Turbine Technical Conference and Exposition, GT 2015

作者： Ding, Zhanming Zhuge, Weilin Zhang, Yangjun Yin, Yong Zhang, Shuyong State Key Laboratory of Automotive Safety and Energy Tsinghua University Beijing100084 China Science and Technology on Diesel Engine Turbocharging Laboratory Tianjin300400 China Commercial Vehicle Technical Center Dongfeng Motor Co. Ltd Wuhan430056 China

ISBN: (纸本)9780791856796

Waste heat recovery (WHR) is one of the main approaches to improve the internal combustion engine (ICE) overall efficiency and reduce emissions. The electric turbocompounding (ETC) technology is considered as a promising WHR technology for vehicle engines due to its compactness and light weight. In order to improve the overall fuel efficiency of the engine at practical operating conditions, the impacts of the implementation of the ETC system should be investigated not only at engine full load conditions, but also under practical driving cycles. In this paper, an ETC system was designed for a 4.75 L diesel engine, in which a power turbine was installed downstream to the turbocharger turbine. A performance simulation model of the ETC engine was developed on the basis of the diesel engine model, which was validated against engine performance experimental data. The control strategies of the wastegate of turbocharger turbine, the wastegate of power turbine and the operating torque of generator were determined. The relative variation in BSFC was studied under full range of operating conditions, and results show that the maximum improvement of fuel economy is 6.7% at an engine speed of 1000 rpm and 70% of full load, in comparison with the baseline diesel engine. Main factors lead to the performance differences between the ETC engine and the baseline engine were analyzed. Furthermore, the performance of the ETC engine under the C-WTVC driving cycle was investigated. Results show that the implementation of the ETC system resulted in a 1.2% fuel consumption reduction under the C-WTVC driving cycle. Copyright © 2015 by ASME.

关键词： diesel engines

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