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基于翅片超表面钝体的流致振动俘能特性研究

力学学报 2023年第10期55卷 2199-2216页

作者：张野王军雷郑州大学机械与动力工程学院郑州450001

超表面结构对钝体气动力特性有显著影响.为了增强普通圆柱的流致振动俘能特性,在圆柱表面装配不同高度和不同数量的翅片超表面并研究其对流致振动俘能特性的影响.搭建流致振动俘能实验平台并制作压电俘能器,实验分析了不同俘能器的俘能... 详细信息

超表面结构对钝体气动力特性有显著影响.为了增强普通圆柱的流致振动俘能特性,在圆柱表面装配不同高度和不同数量的翅片超表面并研究其对流致振动俘能特性的影响.搭建流致振动俘能实验平台并制作压电俘能器,实验分析了不同俘能器的俘能特性.基于Tamura和Shimada提出的涡驰耦合模型(Tamura-Shimada模型),推导单自由度(single-degree-of-freedom,SDOF)压电俘能器流−固−电耦合理论模型,并研究了俘能器的气动力参数对其俘能特性的影响.建立计算流体动力学(computational fluid dynamics,CFD)模型,仿真分析了不同钝体的旋涡脱落模式和流场特性.实验结果表明翅片超表面能够显著改变钝体的动力学响应:抑制涡激振动从而降低俘能特性或从涡激振动转变为驰振从而显著增强俘能特性.当风速超过相应驰振起振风速后,俘能器出现驰振特征并表现为稳定的极限环振荡(limit cycle oscillation,LCO).理论模型能够较为准确地预测俘能器的电压响应.通过仿真分析可知,翅片超表面能够显著改变钝体后方的旋涡强度,导致其动态响应发生变化,最终影响其俘能特性.此外,研究了不同接口电路对压电俘能器输出功率的影响,与标准直流(direct current,DC)电路相比,自供能同步电荷提取(self-powered synchronous charge extraction,SP-SCE)电路不仅可以提升压电俘能器的输出功率同时也可以提供更加稳定的功率输出,消除了阻抗匹配的要求,保证了高性能压电俘能器在实际应用中的灵活性.

关键词：翅片超表面流致振动俘能气动力接口电路

Modeling Motorization Development in China

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Journal of Transportation Technologies 2012年第3期2卷 267-276页

作者： junlei wang Xiaoduan Sun Yulong He Shuzhan Hou Transportation Research Center Beijing University of Technology Beijing China University of Louisiana Lafayette

Entering the 21st century, China’s economic development has reached new heights and the country has ascended to the world’s second largest economy. The 20 year unrelenting development in China also stimulates income growth. The increased disposable income enables an ordinary Chinese family vehicle ownership which was unthinkable two decades ago. The most populous country has started a love affair with automobile just like in the United States. Annual automobile sales in China rose from 2.1 million in 2000 to 18.1 million in 2010 with a yearly growth rate of 24.3%, which spurs the vehicle ownership increase from 18.1 million in 2000 to 78.8 million in 2010, a growth rate of 15.9% The unprecedented motorization development in China is making a huge impact on all aspects of society, including negative consequences that cannot be ignored. Traffic congestion, air pollution, and dependency on imported oil are huge emerging problems threatening Chinese sustainable development. Although these problems occurred and still exist in many other developed and developing countries, they are more acute in China today. By collecting and analyzing the massive data from various sources, this paper explores the relationship between economic development and level of mobility by studying the historical developments from several developed counties and discusses the key issues in Chinese motorization development. The objective of the study is to predict the future level of motorization and its potential impacts.

关键词： Motor and Society Motorization Gompertz Growth Function Vehicle Ownership Per Capita GDP GDP Elasticity Forecast

The Research about Prescribed Workspace for Optimal Design of 6R Robot

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Modern Mechanical Engineering 2014年第3期4卷 154-163页

作者： Yi Gan Weiwei Yu Weiming He junlei wang Fujia Sun College of Mechanical Engineering University of Shanghai for Science and Technology Shanghai China College of Mechanical Engineering University of Shanghai for Science and Technology Shanghai China Department of Precision Mechanics Faculty of Science and Engineering Chuo University Tokyo Japan

Based on the D-H notation, kinematics model and inverse kinematics model of 6R industrial robots are established. Using graphical method, the boundary curve equations of the 6R industrial robot workspace are obtained. Based on the prescribed workspace, the D-H parameter optimization method of 6R industrial robots is proposed. Using the genetic algorithm to determine the structural dimensions of a 6R robot, we make sure that its workspace can exactly contain the prescribed workspace. This method can be used to reduce the overall size of the robot, save materials and reduce the power consumption of the robot during its work time.

关键词： 6R Robot Prescribed Workspace Optimal Design

Study on Assist Characteristic of Commercial Vehicle EPS System Based on Lateral Acceleration

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Study on Assist Characteristic of Commercial Vehicle EPS Sys...

Reductive lipid nanoparticles loaded with vinorelbine inhibit chemotherapy-induced invasion of cancer cells by modulating ENPP2

2020中国汽车工程学会年会暨展览会

作者： Feng Qianlong wang junlei Kang Kai Yang Fan China Automotive Technology and Research Center Co. Ltd.

In order to improve the steering performance of heavy-loaded commercial vehicle under different lateral accelerations,an electric power steering system（EPS） based on lateral acceleration changes is *** influence of lateral acceleration on steering resistance torque and ideal hand torque is *** four-dimensional assist characteristics considering the variation of lateral acceleration and the control strategy of new EPS system are *** co-simulation,the assist characteristics of new EPS and traditional EPS are *** is verified that the new EPS can effectively adapt to the impact of lateral acceleration on resistance torque,make the driver have better steering portability and handling stability,and can obtain clearer steering *** the same time,when the speed is high,the sensitivity of steering system is weakened,reduced driver’s mental burden.

关键词： lateral acceleration EPS assist characteristic control strategy co-simulation

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Nano Research 2024年第4期17卷 2886-2898页

作者： Xiaoqi Zhao Xuemeng Guo Mei Pang Weigen Qiu Zhenyu Luo Qing Lin Yichao Lu Hang Yin Sijie wang Huihui Liu junlei Zhang Lihua Luo Jian You College of Pharmaceutical Sciences Zhejiang University866 Yuhangtang RoadHangzhou 310058China Hangzhou Institute of Innovative Medicine Zhejiang UniversityHangzhou 310058China

Cancer is a predominant culprit behind worldwide death and accounts for up to 10 million deaths every *** is the primary therapeutic method employed for cancer in clinical settings and is essential in controlling tumor *** the advances in this field,tumor invasion and metastasis during treatment remain a significant cause of treatment ***,the underlying mechanisms involving such a disappointing phenomenon are still not fully ***(VNB)extends the lifespan of many cancer patients in the clinic as an emerging chemotherapy drug approved by Food and Drug Administration(FDA).However,VNB-induced tumor metastasis is still an intractable problem,which may be closely related to the abnormal oxidative stress generated during VNB-mediated ***,the study aims to construct a reductive nanosystem loaded with VNB,called VNB-VNP,to improve cancer cure rates and reduce tumor *** the reductive component vitamin E,VNB-VNP can effectively reduce oxidative stress and significantly outperform free VNB in preventing tumor *** transcriptome analysis shows that VNB-VNP can alleviate the over-expression of ectonucleotide pyrophosphatase/phosphodiesterase 2(ENPP2),which may be the main reason why VNB-VNP can inhibit tumor invasion and ***,the research designs a new platform for VNB treatment,which demonstrates promising efficacy in inhibiting neoplastic progression and identifies a new mechanism associated with VNB-induced tumor metastasis,which may offer several valuable references for enhancing chemotherapy efficacy in clinical anti-tumor therapy.

关键词： chemotherapy vinorelbine tumor Invasion lysophosphatidic acid ectonucleotide pyrophosphatase/phosphodiesterase 2(ENPP2)

Improving iconic memory through contrast detection training with HOA-corrected vision

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Fundamental Research 2024年第1期4卷 95-102页

作者： Ling Gong junlei Zhao Yun Dai Zili wang Fang Hou Yudong Zhang Zhong-Lin Lu Jiawei Zhou State Key Laboratory of Ophthalmology Optometry and Vision ScienceEye HospitalSchool of Ophthalmology and OptometryWenzhou Medical UniversityWenzhou 325027China Institute of Optics and Electronics Chinese Academy of SciencesChengdu 610209China The Key Laboratory of Adaptive Optics Chinese Academy of SciencesChengdu 610209China Chengdu University of Traditional Chinese Medicine Chengdu 610075China Division of Arts and Sciences New York University ShanghaiShanghai 200126China Center for Neural Science Department of PsychologyNew York UniversityNew York 10003United States NYU-ECNU Institute of Brain and Cognitive Science at NYU Shanghai Shanghai 200062China

Iconic memory and short-term memory are not only crucial for perception and cognition,but also of great importance to mental ***,we first showed that both types of memory could be improved by improving limiting processes in visual processing through perceptual *** adults were trained in a contrast detection task for ten days,with their higher-order aberrations(HOA)corrected in *** found that the training improved not only their contrast sensitivity function(CSF),but also their iconic memory and baseline information maintenance for short-term memory,and the relationship between memory and CSF improvements could be well-predicted by an observer *** results suggest that training the limiting component of a cognitive task with visual perceptual learning could improve visual *** may also provide an empirical foundation for new therapies to treat people with poor sensory memory.

关键词： Perceptual learning Iconic memory Higher-order aberrations Contrast sensitivity Short-term memory

利用摩擦纳米发电机的流体能量俘获研究新进展

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力学学报 2021年第11期53卷 2910-2927页

作者：李申芳王军雷王中林郑州大学机械与动力工程学院郑州450001 中国科学院北京纳米能源与系统研究所北京101400

环境中的流体(包括气体和液体)动能是十分丰富且重要的清洁能源之一,流体能量可通过不同的能量俘获技术(电磁发电技术、压电能量俘获技术)被转化为电能并供人们使用.自2012年王中林研究团队发明摩擦纳米发电机(triboelectric nanogenera... 详细信息

环境中的流体(包括气体和液体)动能是十分丰富且重要的清洁能源之一,流体能量可通过不同的能量俘获技术(电磁发电技术、压电能量俘获技术)被转化为电能并供人们使用.自2012年王中林研究团队发明摩擦纳米发电机(triboelectric nanogenerator, TENG)以来, TENG已成为了最重要的能量,俘获技术之一,并应用于流体能量俘获研究中.论文综述了当前用于流体能量俘获的摩擦纳米发电机(fluidic energy harvesting TENG,FEH-TENG)的研究现状.介绍了FEH-TENG中摩擦电材料之间的电荷转移原理以及基本的工作模式.在气流动能俘获方面,流致振动(如涡激振动、驰振、颤振和尾流驰振等)是一种有效的将流体动力转化为机械能的物理机制,基于该机制,总结了FEH-TENG在风能和流致振动能量俘获中的研究进展以及各类能量俘获结构.液体动能俘获方面总结了FEH-TENG在波浪和雨滴能量俘获中的研究进展.介绍了基于FEH-TENG的混合能量俘获系统和摩擦电材料优化在提升FEH-TENG流体能量俘获效率方面的研究.接着介绍了FEH-TENG在不同领域中的应用.最后讨论了目前FEH-TENG在流体能量俘获中存在的问题并提出了一些展望.论文工作有助于推动FEH-TENG在流体能量俘获领域的发展以及促进相关研究人员对该领域的认识.

关键词：摩擦纳米发电机流体能量混合能量俘获摩擦电材料自供电系统

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基于拟时间函数的气井不稳定生产数据分析

天然气工业 2014年第10期34卷 59-65页

作者：王军磊贾爱林甯波蒋俊超中国石油勘探开发研究院

将气井不稳定流动阶段的产量、压力等生产数据处理为产量修正的拟压力差与拟时间,利用两者间的线性关系可以确定出裂缝长度、地层渗透率等参数,据此评价气井压裂效果、预测气井生产动态。为了准确计算拟时间值,通过引入动边界概念,将探... 详细信息

将气井不稳定流动阶段的产量、压力等生产数据处理为产量修正的拟压力差与拟时间,利用两者间的线性关系可以确定出裂缝长度、地层渗透率等参数,据此评价气井压裂效果、预测气井生产动态。为了准确计算拟时间值,通过引入动边界概念,将探测边界视为压力扰动的外边缘,利用积分方法求解渗流偏微分方程,得到由气井生产引起的探测边界传播规律,结合物质平衡方程获得探测范围内的平均地层压力,并借助迭代算法确定不同生产时刻对应的气体拟时间。结果表明:与拟时间相比,直接使用真实时间分析生产数据,定压生产时引起直线斜率偏小,且生产压差越大偏差程度越明显,定产生产时导致数据线性相关性变差,气井产量越高相关系数越低;在变产量生产时,利用物质平衡拟时间能够消除气体高压物性和变产量带来的非线性影响,明确生产数据间的线性关系,压裂参数的计算结果更为合理。

关键词：气井线性流探测边界平均地层压力拟时间生产数据裂缝长度

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完全湍流剪切层对圆柱涡激振动特性的影响

哈尔滨工业大学学报 2017年第1期49卷 178-183页

作者：王军雷吴金星丁林任保增郑州大学化工与能源学院郑州450001 低品位能源利用技术及系统教育部重点实验室(重庆大学) 重庆400044

为研究完全湍流剪切层(2×10~4~4×10~4 详细信息

为研究完全湍流剪切层(2×10~4~4×10~4

关键词：涡激振动质量阻尼比流固耦合旋涡脱落湍流剪切层