检索结果-南通市图书馆

The Aerodynamic Development of VOYAH Zhuiguang BEV Version

2023中国汽车工程学会年会暨展览会

作者： liu kaihe Chang Haitao Li Yang VOYAH Automobile Technology Company

This paper introduces some thoughts about the aerodynamic pressure center of ***,the simplification to a center point of the force system in space is introduced,and then the force on the vehicle surface is *** aerodynamic pressure center is verified by the results of the wind tunnel tests of real vehicles and CFD simulation *** last,the equations of the central axis of the force screw and the central line of the wind pressure are derived,and the CFD simulation results are used to verify the correctness of the theory.

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

The Aerodynamic Development of VOYAH Zhuiguang BEV Version

汽车滑行试验道路阻力和风阻系数不确定度分析

2023中国汽车工程学会年会暨展览会

作者： Chu YongJin liu kaihe Xu Lin VOYAH Automobile Technology Company

This article provides an overview of the aerodynamic development process of Voyah's first sedan,zhuiguang bev version as an ***,the target is set through competitive analysis and from the vehicle range ***,the shape optimal design of the BEV is conducted to reduce the drag coefficient(Cd) value by CFD simulation and clay model wind tunnel ***,Automobile accessories is used to reduce the Cd value,which include assembling the active grille shutter(AGS) and aerodynamic rim and optimizing the bottom plate and wheel ***,through the wind tunnel test of the prototype car,to achieve the goal of wind resistance coefficient.

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

同济大学学报（自然科学版） 2024年第S01期52卷 98-108页

作者：梁盛平罗威刘开贺李洋张永仁岚图汽车科技有限公司武汉430056

对汽车滑行试验过程中滑行速度进行统计学分析,发现各个轮次的滑行车速偏差近似与平均滑行车速呈线性关系。基于滑行车速,分别利用v-F方法和v-t方法拟合得到汽车的滑行阻力和风阻系数,分析其对应优化问题的凸性和滑行阻力、风阻系数的... 详细信息

对汽车滑行试验过程中滑行速度进行统计学分析,发现各个轮次的滑行车速偏差近似与平均滑行车速呈线性关系。基于滑行车速,分别利用v-F方法和v-t方法拟合得到汽车的滑行阻力和风阻系数,分析其对应优化问题的凸性和滑行阻力、风阻系数的不确定度;结果表明,v-F方法对应拟合问题是凸的,而v-t方法对应的拟合问题是非凸的。在拟合道路载荷时,需要选择泛化能力较强的迭代算法,同时需要根据参数的物理意义,设置合理的初始值和约束边界,以便得到合理的拟合参数值和道路阻力;而且相比v-F方法,v-t方法得到的风阻系数不确定度更小,置信区间也更窄。另外,基于车辆滑行速度的统计规律,进行蒙特卡洛模拟,分别应用v-F和v-t方法,得到道路阻力和风阻系数近似为正态分布;结果表明,v-F方法会放大随机因素的影响,v-t方法得到的道路阻力和风阻系数均更为稳定。

关键词：汽车滑行道路阻力风阻系数随机过程优化问题凸性不确定度蒙特卡洛模拟

相关乘性和加性高斯白噪声激励下周期势系统的随机共振

在线全文

学校读者我要写书评

暂无评论

动力学与控制学报 2016年第1期14卷 59-63页

作者：刘开贺靳艳飞马正木北京理工大学宇航学院力学系北京100081

研究了外加周期信号作用下,相关高斯乘性和加性白噪声激励下周期势系统的随机共振.利用线性响应理论,计算了系统输出信号的功率谱密度、振幅、相位差.研究结果表明:当加性噪声强度和关联系数不变的情况下,通过调整乘性噪声强度可以出现... 详细信息

研究了外加周期信号作用下,相关高斯乘性和加性白噪声激励下周期势系统的随机共振.利用线性响应理论,计算了系统输出信号的功率谱密度、振幅、相位差.研究结果表明:当加性噪声强度和关联系数不变的情况下,通过调整乘性噪声强度可以出现随机共振;关联系数的正负以及大小对随机共振的影响较小.当乘性噪声强度较小时,输出信号的振幅和相位差曲线有一个单峰出现,即出现随机共振现象,能量从噪声向信号进行转化.随着噪声强度的增大,随机共振现象消失,噪声由增大系统的有序程度渐渐变为增大系统的无序程度.

关键词：随机共振周期势系统相关噪声功率谱密度

在线全文

学校读者我要写书评

暂无评论

基于PLC的烟用内衬纸自动润滑系统设计

设备管理与维修 2020年第16期 107-108页

作者：刘开合马义王学军步刚刘凯山东中烟工业有限责任公司滕州卷烟厂山东枣庄277500

设计基于PLC的烟用内衬纸自动润滑系统,对自动润滑系统的工作原理进行简要分析,完成内衬纸自动润滑系统总体结构的设计,并通过硬件设计确定合理可靠的功能模块,最后完成自动润滑系统的软件流程设计。

关键词：内衬纸 PLC 自动化润滑

环境因素对纯Zn在饱和Zn(OH)_2溶液中腐蚀行为的影响Ⅰ——Cl^-浓度和pH值

在线全文

学校读者我要写书评

暂无评论

中国腐蚀与防护学报 2016年第6期36卷 522-528页

作者：刘栓周开河方云辉徐孝忠江炯郭小平郑文茹蒲吉斌王立平中国科学院宁波材料技术与工程研究所中国科学院海洋新材料与应用技术重点实验室浙江省海洋材料与防护技术重点实验室宁波315201 国网浙江省电力公司宁波供电公司宁波315201 芜湖春风新材料有限公司芜湖241000

研究纯Zn在模拟大气腐蚀环境(饱和Zn(OH)_2溶液)中的初期电化学腐蚀机理。采用极化曲线和电化学阻抗谱,结合扫描电子显微镜,探究Cl^-浓度和pH值对纯Zn在饱和Zn(OH)_2溶液中电化学腐蚀行为的影响。结果表明:Cl^-破坏了锈层结构,诱导点蚀... 详细信息

研究纯Zn在模拟大气腐蚀环境(饱和Zn(OH)_2溶液)中的初期电化学腐蚀机理。采用极化曲线和电化学阻抗谱,结合扫描电子显微镜,探究Cl^-浓度和pH值对纯Zn在饱和Zn(OH)_2溶液中电化学腐蚀行为的影响。结果表明:Cl^-破坏了锈层结构,诱导点蚀发生,纯Zn的腐蚀速率随着Cl^-浓度的升高而增大。纯Zn在强碱性溶液中处于钝态,其耐蚀性能随着pH值的升高而增大。

关键词：纯Zn 腐蚀行为 Cl- pH值

同方期刊数据库

Development and performance evaluation of a high temperature resistant, internal rigid, and external flexible plugging agent for water-based drilling fluids

在线全文

学校读者我要写书评

暂无评论

Petroleum 2023年第1期9卷 33-40页

作者： Zhe Xu Jinsheng Sun Li Li kaihe Lv Jingping liu Zhiwen Dai Xianfa Zhang Zonglun Wang School of Petroleum Engineering China University of Petroleum(East China)Qingdao266580China CNPC Engineering Technology R&D Company Limited Changping10206China Oil&Gas Technology Research Institute of Changqing Oilfield Company Xi'an710000China

During the drilling process for oil and gas production,a larger number of drilling fluids invade the formation,causing severe formation damage and wellbore collapsing,which seriously hinders the efficient production of deep oil and *** several plugging agents have been developed for efficient fracture sealing in recent years,the development of high-performance plugging agents with self-adaptive ability and high-temperature resistance remain a ***,we report the synthesis of an internal rigid and external flexible plugging agent PANS by reversed-phase emulsion polymerization with nano-silica as the rigid core and poly(acrylamide-co-N-vinylpyrrolidone)as a flexible *** plugging agent has a median particle size of 10.5μm and can self-adapt to seal the microfractures and fractures in the formation,leading to an effective reduction in the filtration loss of bentonite water-based drilling fluid under both low temperature and low pressure(LTLP)and high temperature and high pressure(HTHP)*** addition,compared with the neat nano-silica(500 nm),the sealing efficiency of PANS toward 100–120 mesh sand bed was increased by 71.4%after hot rolling at 180°C.

关键词： Internal rigidity External flexibility Plugging agent Filter loss reduction Plugging performance

The construction of pseudo-Janus silica/surfactant assembly and their application to stabilize Pickering emulsions and enhance oil recovery

在线全文

学校读者我要写书评

暂无评论

Frontiers of Chemical Science and Engineering 2022年第7期16卷 1101-1113页

作者： Han Jia Jiajun Dai Tingyi Wang Yingbiao Xu Lingyu Zhang Jianan Wang Lin Song kaihe Lv Dexin liu Pan Huang Shandong Key Laboratory of Oilfield Chemistry School of Petroleum EngineeringChina University of Petroleum(East China)Qingdao 266580China Key Laboratory of Unconventional Oil&Gas Development(China University of Petroleum(East China)) Ministry of EducationQingdao 266580China Technology Inspection Center Shengli Oilfield CompanySINOPECDongying 257000China Department of Chemical and Materials Engineering University of Alberta EdmontonAB T6G 1H9Canada

Nanoparticles with high surface energy and chemical activity have drawn substantial attention in petroleum industry. Recently, Janus nanoparticles exhibited tremendous potential in enhanced oil recovery (EOR) due to their asymmetric structures and properties. In this study, a series of amphiphilic pseudo-Janus@OTAB (PJ@C18) nanoparticles with different concentrations of stearyltrimethylammoium bromide (OTAB) were successfully fabricated. The structures and properties of PJ@C18 were characterized by Fourier transform infrared spectroscopy and ζ-potential measurements. Based on the emulsification experimental results, the interaction models and the self-assembly behavior between hydrophilic nanoparticles (SiO_(2)@NH_(2)) and OTAB molecules at the oil/water interface were proposed, which was further confirmed via the measurements of the contact angle and dynamic interfacial tension. Interestingly, it was found that the change of pH value from 7.5 to 4.0 caused the type reversal of the PJ@C18-1000 stabilized Pickering emulsions. Furthermore, the PJ@C18-1000 stabilized Pickering emulsion system with excellent salt and temperature tolerances (10000 mg∙L^(–1), 90℃) significantly improved the oil recovery in the single-tube (more than 17%) and double-tube (more than 25%) sand pack model flooding tests. The findings of this study could help to better understand the construction mechanism of pseudo-Janus silica/surfactant assembly and the potential application of PJ@C18-1000 stabilized Pickering emulsions for EOR.

关键词： Janus nanoparticles surfactant double phase inversion self-assembly enhanced oil recovery

Application status and prospect of ionic liquids in oilfield chemistry

在线全文

学校读者我要写书评

暂无评论

Petroleum 2024年第1期10卷 11-18页

作者： Jinsheng Sun Zhuoyang Xiu Li Li kaihe Lv Xianfa Zhang Zonglun Wang Zhiwen Dai Zhe Xu Ning Huang Jingping liu School of Petroleum Engineering China University of Petroleum(East China)Qingdao266580China CNPC Engineering Technology R&D Company Limited Changping10206China Oil&Gas Technology Research Institute of Changqing Oilfield Company Xi'an710000China

The ionic liquid,as a new treatment agent,has been increasingly applied in oil fields due to its strong temperature resistance,good solubility and high surface *** this paper,we systematically discuss the action mechanism and application effect of ionic liquids in oilfield *** liquids can inhibit shale hydration expansion and reduce fluid loss through adsorption and intercalation,inhibit the formation of natural gas hydrate through imidazole five-membered ring structure as a space barrier,reduce viscosity of heavy oil by breaking chemical bonds of heavy oil macromolecules and charge transfer,improve oil displacement efficiency by forming ions pairs with carboxyl groups in crude oil,demulsify by forming channels between dispersed water droplets,acidify the formation by reacting with water to produce acid,interacts with organic material through weak hydrogen bonds and extracts it from oilfield wastewater,desulphurize by inserting sulfide molecules into the“stack”structure and form liquid inclusion complex,inhibit corrosion by forming a protective film on the metal *** on the above aspects,the development direction of ionic liquids is *** application of ionic liquids in oilfield chemistry is still in its *** is urgent to fully explore the application performance of ionic liquids in oilfield chemistry,which also provides theoretical and technical supports for efficient reservoir development.

关键词： Ionic liquids Oilfield chemistry Shale inhibitor Drilling fluid