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2 Mb/s高速信令 1

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DPP);分布式功率转换器;开关电容转换器 1

Ga)Se2光伏组件 1

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三维布局;势能曲面变平;布局优化;性能约束 1

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Variable identification and automatic tuning of the main module of a servo system of parallel mechanism

YANG Zhiyong, XU Meng, HUANG Tian, NI Yanbing

《机械工程前沿(英文)》 2007年 第2卷 第1期   页码 82-88 doi: 10.1007/s11465-007-0014-x

摘要: The variables of the main module of a servo system for miniature reconfigurable parallel mechanism were identified and automatically tuned. With the reverse solution module of the translation, the module with the exerted translation joint was obtained, which included the location, velocity and acceleration of the parallelogram carriage-branch. The rigid dynamic reverse model was set as the virtual work principle. To identify the variables of the servo system, the triangle-shaped input signal with variable frequency was adopted to overcome the disadvantages of the pseudo-random number sequence, i.e., making the change of the vibration amplitude of the motor dramatically, easily impact the servo motor and make the velocity loop open and so on. Moreover, all the variables including the rotary inertia of the servo system were identified by the additive mass. The overshoot and rise time were the optimum goals, the limited changing load with the attitude was considered, and the range of the controller variables in the servo system was identified. The results of the experiments prove that the method is accurate.

关键词: acceleration     reconfigurable parallel     additive     sequence     parallel mechanism    

Mechanical design and analysis of a novel variable stiffness actuator with symmetrical pivot adjustment

《机械工程前沿(英文)》 2021年 第16卷 第4期   页码 711-725 doi: 10.1007/s11465-021-0647-1

摘要: The safety of human–robot interaction is an essential requirement for designing collaborative robotics. Thus, this paper aims to design a novel variable stiffness actuator (VSA) that can provide safer physical human–robot interaction for collaborative robotics. VSA follows the idea of modular design, mainly including a variable stiffness module and a drive module. The variable stiffness module transmits the motion from the drive module in a roundabout manner, making the modularization of VSA possible. As the key component of the variable stiffness module, a stiffness adjustment mechanism with a symmetrical structure is applied to change the positions of a pair of pivots in two levers linearly and simultaneously, which can eliminate the additional bending moment caused by the asymmetric structure. The design of the double-deck grooves in the lever allows the pivot to move freely in the groove, avoiding the geometric constraint between the parts. Consequently, the VSA stiffness can change from zero to infinity as the pivot moves from one end of the groove to the other. To facilitate building a manipulator in the future, an expandable electrical system with a distributed structure is also proposed. Stiffness calibration and control experiments are performed to evaluate the physical performance of the designed VSA. Experiment results show that the VSA stiffness is close to the theoretical design stiffness. Furthermore, the VSA with a proportional–derivative feedback plus feedforward controller exhibits a fast response for stiffness regulation and a good performance for position tracking.

关键词: variable stiffness actuator     variable stiffness module     drive module     symmetrical structure     double-deck grooves     expandable electrical system    

一种新型的部分遮挡和非匹配条件下最大功率点跟踪光伏子模块级功率平衡拓扑结构 Article

Mustafa GOKDAG,Mehmet AKBABA

《信息与电子工程前沿(英文)》 2016年 第17卷 第12期   页码 1388-1396 doi: 10.1631/FITEE.1500322

摘要: 部分遮挡和串联模块(或子模块)的非匹配条件可在整个光伏系统中导致功率曲线非凸且出现多个局部极值和峰值功率下降的现象。通过功率传输,可将各子模块的工作电压拉平;这样的功率收集操作可生成凸功率曲线,提升光伏系统的峰值功率。本文所述拓扑结构受益于开关电容(Switched capacitor, SC)转换器的概念,是一种子模块级功率平衡概念的具体应用。与现有研究成果相比,其创新点包含无遮挡时停止开关操作、串联线路级可拓展性以及减少功率电子元件使用量。功率电子元件使用量的减少是通过两个子模块共享一个SC转换器的方式实现的,这也能带来降低功率器件能量损耗、降低成本和电路体积的优势。本文给出了所述拓扑结构的插入损耗的理论式,并通过PSpice仿真和原型电路的实验评估,证明了损耗理论解的正确性。这也表明,通过使用所述拓扑结构,有可能提取出部分遮挡的光伏线路的几乎所有可用能量,并将其传输至负载端。

关键词: 子模块级最大功率点跟踪(Sub-module-level maximum power point tracking     MPPT);差分功率处理(Differential power processing    

Air-borne noise of thermal module and system for notebook personal computers: experimental study

SHI Junye, JIANG Cailing, QIAO Junsheng, CHEN Jiangpin, LI Xiaoping, ZHANG Xiaojun

《能源前沿(英文)》 2008年 第2卷 第2期   页码 174-178 doi: 10.1007/s11708-008-0034-1

摘要: Thermal performance is the most important issue to be considered when a thermal module is designed for a notebook personal computer (PC). Because the fan causes air-borne noise and affects the user’s comfort, the acoustic characteristics of the module attract more attention. Experiments were conducted to study the noise sources, the noise characteristic and the main factors influencing the noise level. The difference between the air-borne noise of the thermal module and the whole computer system was analyzed and its propagating characteristics were derived. The influence of I/O ports on the air-borne noise was also studied experimentally.

关键词: air-borne     attention     propagating     characteristic     personal computer    

Transcriptional modules related to hepatocellular carcinoma survival: coexpression network analysis

null

《医学前沿(英文)》 2016年 第10卷 第2期   页码 183-190 doi: 10.1007/s11684-016-0440-4

摘要:

We performed weighted gene coexpression network analysis (WGCNA) to gain insights into the molecular aspects of hepatocellular carcinoma (HCC). Raw microarray datasets (including 488 samples) were downloaded from the Gene Expression Omnibus (GEO) website. Data were normalized using the RMA algorithm. We utilized the WGCNA to identify the coexpressed genes (modules) after non-specific filtering. Correlation and survival analyses were conducted using the modules, and gene ontology (GO) enrichment was applied to explore the possible mechanisms. Eight distinct modules were identified by the WGCNA. Pink and red modules were associated with liver function, whereas turquoise and black modules were inversely correlated with tumor staging. Poor outcomes were found in the low expression group in the turquoise module and in the high expression group in the red module. In addition, GO enrichment analysis suggested that inflammation, immune, virus-related, and interferon-mediated pathways were enriched in the turquoise module. Several potential biomarkers, such as cyclin-dependent kinase 1 (CDK1), topoisomerase 2α (TOP2A), and serpin peptidase inhibitor clade C (antithrombin) member 1 (SERPINC1), were also identified. In conclusion, gene signatures identified from the genome-based assays could contribute to HCC stratification. WGCNA was able to identify significant groups of genes associated with cancer prognosis.

关键词: hepatocellular carcinoma     coexpression     module     microarray     prognosis    

电动汽车锂电池模块设计中相似性能电池聚类的综合方法 Article

李伟, 陈思琦, 彭雄斌, 肖蜜, 高亮, Akhil Garg, 包能胜

《工程(英文)》 2019年 第5卷 第4期   页码 795-802 doi: 10.1016/j.eng.2019.07.005

摘要:

新能源汽车的核心组成部分为能量存储系统,该系统由多个锂电池模块组成,为车辆传动系统提供主要动力。然而模块中的单体电池由于生产制造的缺陷,在性能上往往表现出差异。这些差异的存在会导致电池模块的不完全充放电以及温度分布的不均匀,进而导致循环寿命和电池容量随着时间的推移而降低。为解决这一问题,本工作采用实验和数值方法对性能相似的电池进行了全面的聚类研究,从而得到了电化学性能更好的电池模块。首先通过模块拆解实验来测量电池性能参数,并基于k-均值聚类与支持向量聚类算法设计电池模块,每个模块均由12块电池组成。然后在风冷条件下测量一定时间内电池模块的实际温升,验证聚类设计的效果。研究发现第三类(支持向量聚类)电池模块的性能最佳,充放电最高观测温度为32 ℃。相比之下,其他电池模块的最高温度值要更高:第一类(厂家原装)电池模块为40 ℃,第二类(厂家原装)电池模块为36 ℃,以及第四类(k-均值聚类)电池模块为35 ℃。

关键词: 聚类算法     电池模块     均衡     电动汽车    

Module-based method for design and analysis of reconfigurable parallel robots

Fengfeng XI, Yuwen LI, Hongbo WANG

《机械工程前沿(英文)》 2011年 第6卷 第2期   页码 151-159 doi: 10.1007/s11465-011-0121-6

摘要:

This paper presents a method for the design and analysis of reconfigurable parallel robots. The inherent modularity in a parallel robot lends itself as a natural candidate for reconfiguration. By taking the branches as building blocks, many modular parallel robots can be constructed, from which a reconfigurable parallel robot can be realized. Among three types of reconfigurations, namely, geometry morphing, topology morphing, and group morphing, the method presented here is for the last two reconfigurations, thereby advancing the current research that is mainly limited to geometry morphing. It is shown that the module-based method not only provides a systematic way of designing a reconfigurable parallel robot, but also offers a unified modeling for robot analysis. Two examples are provided, one showing the topology morphing and the other showing the group morphing.

关键词: reconfigurable parallel robot     topology morphing     group morphing    

求解多目标卫星舱布局优化问题的带局部搜索的Wang-Landau抽样算法 Article

Jing-fa LIU,Liang HAO,Gang LI,Yu XUE,Zhao-xia LIU,Juan HUANG

《信息与电子工程前沿(英文)》 2016年 第17卷 第6期   页码 527-542 doi: 10.1631/FITEE.1500292

摘要: 卫星舱布局设计问题属于一种NP困难问题,该问题不仅仅是一种复杂的耦合系统设计问题,也是一种特殊的多目标优化问题。解决该问题最大的难点在于待优化的函数具有大量的由高能势垒分隔开的局部极小值点。Wang-Landau (WL)抽样算法是一种改进的蒙特卡罗方法,目前已成功应用于许多优化问题的求解中。本文采用WL抽样算法求解卫星舱布局优化问题。为了加快全局最优解的搜索速度,每次蒙特卡罗扫描产生新布局时便执行基于梯度法的局部搜索(LS)方法。通过结合WL抽样算法、LS方法和启发式布局更新策略,本文提出了WL-LS混合算法用于求解卫星舱最优布局。此外,为了提高算法计算效率,针对两个物体(如两矩形物体,两圆形物体或者一矩形物体和一圆形物体)之间的干涉深度,本文提出了一种快速准确的计算方法。矩形物体是正交放置的。分别测试了包含51个物体和53个物体的两个算例。在两个算例中,本文所提出的算法均超过了文献中的方法。数值结果表明,WL-LS是一种求解卫星舱布局优化问题的有效算法。

关键词: 装填问题;布局设计;卫星舱;Wang-Landau抽样算法    

Isomorphism analysis on generalized modules oriented to the distributed parameterized intelligent product platform

Shasha ZENG, Weiping PENG, Tiaoyu LEI

《机械工程前沿(英文)》 2020年 第15卷 第1期   页码 12-23 doi: 10.1007/s11465-019-0555-9

摘要: The distributed parameterized intelligent product platform (DPIPP) contains many agents of a product minimum approximate autonomous subsystem (generalized module). These distributed agents communicate, coordinate, and cooperate using their knowledge and skills and eventually accomplish the design for mass customization in a loosely coupled environment. In this study, a new method of isomorphism analysis on generalized modules oriented to DPIPP is proposed. First, on the basis of the bill of material partition and generalized module mining, the parameters of the main characteristics are extracted to construct the main characteristic parameter matrix. Second, similarity calculation of generalized modules is realized by improving the clustering using representatives algorithm, and isomorphism model sets are obtained. Generalized modules with a similar structure are combined to complete the isomorphism analysis. The effectiveness of the proposed method is verified by taking high- and medium-pressure valve data as an example.

关键词: distributed parameterized intelligent product platform     generalized module     isomorphism analysis     product family    

中巴地球资源卫星

陈宜元

《中国工程科学》 2001年 第3卷 第3期   页码 9-15

摘要:

介绍了中巴地球资源卫星概况及与国外同类卫星的比较。描述了五谱段CCD相机和四谱段红外扫描仪等有效载荷。扼要介绍了卫星的公用服务平台各分系统和在轨测试性能。在首发星的基础上充分汲取用户意见,把后继星的工作做好。

关键词: 中巴地球资源卫星     有效载荷     服务舱     在轨测试    

A comprehensive simulator for assessing the reliability of a photovoltaic panel peak power tracking system

Nabil KAHOUL,Mourad HOUABES,Ammar NEÇAIBIA

《能源前沿(英文)》 2015年 第9卷 第2期   页码 170-179 doi: 10.1007/s11708-015-0353-y

摘要: When designing a maximum power point tracking (MPPT) algorithm, it is often difficult to correctly predict, before field testing, the behavior of this MPPT under varying solar irradiation on photovoltaic (PV) panels. A solution to this problem is to design a maximum power point trackers simulator of a PV system used to test MPPT algorithms. This simulator must have the same role as the MPPT card of the PV panel and thus will fully emulate the response of a real MPPT card of the PV panel. Therefore, it is a good substitute to help to test the peak power trackers of the PV system in the laboratory. This paper describes a simple peak power trackers simulator of the PV system which has a short response time thus, can be used to test MPPT algorithms under very rapid variation condition. The obtained results and the theoretical operation confirm the reliability and the superior performance of the proposed model.

关键词: photovoltaic module     DC-DC converter     design     maximum power point tracking (MPPT) card     microprocessor    

Real-time simulation platform for photovoltaic system with a boost converter using MPPT algorithm in a DSP controller

Geethanjali PURUSHOTHAMAN, Vimisha VENUGOPALAN, Aleena Mariya VINCENT

《能源前沿(英文)》 2013年 第7卷 第3期   页码 373-379 doi: 10.1007/s11708-013-0272-8

摘要: Recently, real-time simulation of renewable energy sources are indispensible for evaluating the performance of the maximum power point tracking (MPPT) controller, especially in the photovoltaic (PV) system in order to reduce cost in the testing phase. Nowadays, real time PV simulators are obtained by using analog and/or digital components. In this paper, a real-time simulation of a PV system with a boost converter was proposed using only the digital signal processor (DSP) processor with two DC voltage sources to emulate the temperature and irradiation in the PV system. A MATLAB/Simulink environment was used to develop the real-time PV system with a boost converter into a C-program and build it into a DSP controller TMS320F28335. Besides, the performance of the real-time DSP-based PV was tested in different temperature and irradiation conditions to observe the P-V and V-I characteristics. Further, the performance of the PV with a boost converter was tested at different temperatures and irradiations using MPPT algorithms. This scheme was tested through simulation and the results were validated with that of standard conditions given in the PV data sheets. Implementation of this project helped to attract more researchers to study renewable energy applications without real sources. This might facilitate the study of PV systems in a real-time scenario and the evaluation of what should be expected for PV modules available in the market.

关键词: photovoltaic (PV) module     digital signal processor (DSP) controller     power electronic converter     real-time simulation    

虚拟企业CRM系统的原型分析和设计

邓峰,刘现民,杨肖鸳

《中国工程科学》 2004年 第6卷 第10期   页码 83-85

摘要:

描述了虚拟企业CRM(客户关系管理)系统的特点,分析了虚拟企业CRM的信息流,在此基础上给出了一个分布式的虚拟企业CRM运作系统,其必须由虚拟企业CRM的协调企业统一管理和协调,并构造了虚拟企业CRM系统中的协调企业的功能模块参考结构,提出了实现虚拟企业CRM的技术体系参考模型。

关键词: 虚拟企业的CRM     信息流     功能模块     技术体系    

图像水印框架的层级-方向分解分析 Article

M. F. KAZEMI,M. A. POURMINA,A. H. MAZINAN

《信息与电子工程前沿(英文)》 2016年 第17卷 第11期   页码 1199-1217 doi: 10.1631/FITEE.1500165

摘要: 本文研究新型层级-方向分解在图像水印中的应用。实现水印框架的主要步骤是生成带有水印的图像,重点用到轮廓小波嵌入表达。通过一组模拟攻击,基于峰值信噪比(peak signal-to-noise ratio)、结构相似度(structural similarity)等指标评估其性能。利用一组图像并使用不同颜色模型分析所获信息,以判断正态相关性。相应地,每当扰码模块作用于一组原始图像,用以表示无序信息,就使用逆轮廓小波嵌入表达以获取带有水印的图像。从而,我们可以通过分析一个复杂系统--其中设计了一个决策系统,使用轮廓小波嵌入表达来发现最优层级和相应方向--评估所提方法的性能。对于所得到的结果,利用恰当的层级-方向分解阐释。本文主要贡献在于,在轮廓小波嵌入表达新机制的基础上,集成一套子系统,与决策系统相配合。与现有方法相比,本文所述方法在大量重度攻击下仍然有效。利用多个基准数据集对所提方案进行了测试,结果证实方法有效。

关键词: 层级-方向分解分析;水印框架;轮廓小波嵌入表达;扰码模块;模拟攻击    

基于LTCC技术与曲折线天线集成的封装天线系统

Gang DONG,Wei XIONG,Zhao-yao WU,Yin-tang YANG

《信息与电子工程前沿(英文)》 2016年 第17卷 第1期   页码 67-73

摘要:

我们提出了一种基于低温共烧陶瓷(LTCC)技术的与弯折线天线集成的封装天线系统。该系统采用曲折线贴片天线,封装层和层压多芯片模块(MCM)来集成集成电路(IC)裸芯片。微带馈线用于减少贴片和封装之间的相互作用。为了减少电磁耦合,设计并分析了通孔结构。弯曲线天线的带宽为220 MHz,中心频率为2.4 GHz,最大增益为2.2 dB,辐射效率超过其工作频率的90%。整个系统具有20.2 mm×6.1 mm×2.6 mm的小尺寸,可通过标准LTCC工艺轻松实现。制作了集成了曲折线天线的封装天线系统,实验结果与仿真结果吻合良好。

关键词: 封装天线(AiP),弯曲线天线,多芯片模块(MCM),低温共烧陶瓷(LTCC),    

标题 作者 时间 类型 操作

Variable identification and automatic tuning of the main module of a servo system of parallel mechanism

YANG Zhiyong, XU Meng, HUANG Tian, NI Yanbing

期刊论文

Mechanical design and analysis of a novel variable stiffness actuator with symmetrical pivot adjustment

期刊论文

一种新型的部分遮挡和非匹配条件下最大功率点跟踪光伏子模块级功率平衡拓扑结构

Mustafa GOKDAG,Mehmet AKBABA

期刊论文

Air-borne noise of thermal module and system for notebook personal computers: experimental study

SHI Junye, JIANG Cailing, QIAO Junsheng, CHEN Jiangpin, LI Xiaoping, ZHANG Xiaojun

期刊论文

Transcriptional modules related to hepatocellular carcinoma survival: coexpression network analysis

null

期刊论文

电动汽车锂电池模块设计中相似性能电池聚类的综合方法

李伟, 陈思琦, 彭雄斌, 肖蜜, 高亮, Akhil Garg, 包能胜

期刊论文

Module-based method for design and analysis of reconfigurable parallel robots

Fengfeng XI, Yuwen LI, Hongbo WANG

期刊论文

求解多目标卫星舱布局优化问题的带局部搜索的Wang-Landau抽样算法

Jing-fa LIU,Liang HAO,Gang LI,Yu XUE,Zhao-xia LIU,Juan HUANG

期刊论文

Isomorphism analysis on generalized modules oriented to the distributed parameterized intelligent product platform

Shasha ZENG, Weiping PENG, Tiaoyu LEI

期刊论文

中巴地球资源卫星

陈宜元

期刊论文

A comprehensive simulator for assessing the reliability of a photovoltaic panel peak power tracking system

Nabil KAHOUL,Mourad HOUABES,Ammar NEÇAIBIA

期刊论文

Real-time simulation platform for photovoltaic system with a boost converter using MPPT algorithm in a DSP controller

Geethanjali PURUSHOTHAMAN, Vimisha VENUGOPALAN, Aleena Mariya VINCENT

期刊论文

虚拟企业CRM系统的原型分析和设计

邓峰,刘现民,杨肖鸳

期刊论文

图像水印框架的层级-方向分解分析

M. F. KAZEMI,M. A. POURMINA,A. H. MAZINAN

期刊论文

基于LTCC技术与曲折线天线集成的封装天线系统

Gang DONG,Wei XIONG,Zhao-yao WU,Yin-tang YANG

期刊论文