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Multi-class dynamic network traffic flow propagation model with physical queues
Yanfeng LI, Jun LI
《工程管理前沿(英文)》 2017年 第4卷 第4期 页码 399-407 doi: 10.15302/J-FEM-2017041
关键词: first-in-first-out (FIFO) multi-class traffic physical queues traffic flow modeling
A survey of instantaneous poles for a class of two-degree-of-freedom spherical mechanisms
Soheil ZARKANDI
《机械工程前沿(英文)》 2014年 第9卷 第4期 页码 344-353 doi: 10.1007/s11465-014-0320-z
This paper is a detailed exploration of instantaneous poles for a class of two-degree-of-freedom (two-DOF) spherical mechanisms (SMs) with seven links or bars. For two-DOF SMs, the secondary instantaneous poles (the ones which cannot be found by direct inspection) must lie on the specified great circles. For many of these mechanisms, however, some of these great circles cannot be obtained by a direct application of Aronhold-Kennedy theorem. This paper presents geometrical and analytical techniques to locate these unknown great circles for three topologies of seven-bar two-DOF SMs.
关键词: spherical mechanisms instantaneous poles Aronhold-Kennedy theorem great circles pencil of meridian
Shiyan ZHENG
《能源前沿(英文)》 2011年 第5卷 第4期 页码 367-375 doi: 10.1007/s11708-011-0170-x
关键词: internal combustion engine irreversibility power output efficiency optimization
Highlights in agri-product quality and safety
Guanghong ZHOU
《农业科学与工程前沿(英文)》 2018年 第5卷 第3期 页码 289-290 doi: 10.15302/J-FASE-2018236
The advances of Sino-German new materials
Rongbiao Wang
《化学科学与工程前沿(英文)》 2018年 第12卷 第3期 页码 327-328 doi: 10.1007/s11705-018-1748-1
Xiaodong JIN, Yuefa FANG, Dan ZHANG, Xueling LUO
《机械工程前沿(英文)》 2020年 第15卷 第1期 页码 66-80 doi: 10.1007/s11465-019-0570-x
关键词: parallel mechanism redundant mechanism large rotational angles machine tools 2R1T spindle head collaborative manipulator
Evaluation of transmissibility for a class of nonlinear passive vibration isolators
Z. K. PENG, Z. Q. LANG, G. MENG
《机械工程前沿(英文)》 2012年 第7卷 第4期 页码 401-409 doi: 10.1007/s11465-012-0349-9
In this study, the concept of Output Frequency Response Functions (OFRFs) is applied to represent the transmissibility of nonlinear isolators in frequency domain. With the OFRFs estimated from numerical simulation responses, an explicit analytical relationship between the transmissibility and the nonlinear characteristic parameters is derived for a wide class of nonlinear isolators that have nonlinear anti-symmetric damping characteristics and a comprehensive pattern about how the nonlinear damping characteristic parameters might affect the force and displacement transmissibility is built for the vibration isolators. The results reveal that it is reasonable to analyze the force and displacement transmissibility of the nonlinear isolators by simply investigating the fundamental harmonic components of the force and displacement outputs of the nonlinear isolators, and the introduction of a nonlinear anti-symmetric damping into vibration isolators can significantly suppress both the force and displacement transmissibility over the resonant frequency region, but has almost no effect on the transmissibility at non-resonant regions. These conclusions are of significant importance in the analysis and design of the nonlinear vibration isolators with nonlinear anti-symmetric damping.
关键词: nonlinear vibration volterra series Output Frequency Response Functions (OFRFs) nonlinear damping vibration isolator
reference tracking control design for a class of nonlinear systems with time-varying delays
Mei-qin LIU,Hai-yang CHEN,Sen-lin ZHANG
《信息与电子工程前沿(英文)》 2015年 第16卷 第9期 页码 759-768 doi: 10.1631/FITEE.1500053
关键词: H∞ reference tracking Nonlinear system State feedback control Time-varying delays Unified model
Technical innovation for Sanyang Road Cross-river Tunnel Project
Yu ZHONG
《工程管理前沿(英文)》 2018年 第5卷 第3期 页码 411-415 doi: 10.15302/J-FEM-2018206
Bio-based Technologies for Resource Recovery
Aijie Wang, David Stuckey
《环境科学与工程前沿(英文)》 2018年 第12卷 第4期 doi: 10.1007/s11783-018-1079-y
Identification of thermal error in a feed system based on multi-class LS-SVM
Chao JIN, Bo WU, Youmin HU, Yao CHENG
《机械工程前沿(英文)》 2012年 第7卷 第1期 页码 47-54 doi: 10.1007/s11465-012-0307-6
Research of thermal characteristics has been a key issue in the development of high-speed feed system. The thermal positioning error of a ball-screw is one of the most important objects to consider for high-accuracy and high-speed machine tools. The research work undertaken herein ultimately aims at the development of a comprehensive thermal error identification model with high accuracy and robust. Using multi-class least squares support vector machines (LS-SVM), the thermal positioning error of the feed system is identified with the variance and mean square value of the temperatures of supporting bearings and screw-nut as feature vector. A series of experiments were carried out on a self-made quasi high-speed feed system experimental bench HUST-FS-001 to verify the identification capacity of the presented method. The results show that the recommended model can be used to predict the thermal error of a feed system with good accuracy, which is better than the ordinary BP and RBF neural network. The work described in this paper lays a solid foundation of thermal error prediction and compensation in a feed system.
关键词: least squares support vector machine (LS-SVM) feed system thermal error precision machining
Comments on the special issue on Agri-product Quality and Safety
Charles F. SHOEMAKER
《农业科学与工程前沿(英文)》 2018年 第5卷 第3期 页码 294-294 doi: 10.15302/J-FASE-2018237
房玉东,朱小勇,刘江虹,张永丰,廖光煊
《中国工程科学》 2006年 第8卷 第7期 页码 89-94
介绍了细水雾的定义和主导灭火机理,对细水雾、水喷淋及气体灭火技术在电气环境的应用进行了比较,说明了细水雾用于电气环境火灾防治的优点及不足。结合前人实验结果系统地阐述了细水雾的导电性、细水雾作用下电气设备击穿强度变化规律、细水雾的滞空性及烟气冲刷能力。重点回顾了国际上细水雾用于计算机、程控交换机及发电机等电气设备火灾防护的可行性及有效性研究,描述了细水雾作用下带电工作的计算机、发电机、程控交换机等设备的稳定性和可靠性,讨论了雾滴粒径、雾滴速度、雾通量及障碍物遮挡程度等因素对扑灭电气火灾有效性的影响,介绍了国际上细水雾灭火技术在电气环境的应用现状。
标题 作者 时间 类型 操作
Multi-class dynamic network traffic flow propagation model with physical queues
Yanfeng LI, Jun LI
期刊论文
A survey of instantaneous poles for a class of two-degree-of-freedom spherical mechanisms
Soheil ZARKANDI
期刊论文
Unified cycle model of a class of internal combustion engines and their optimum performance characteristics
Shiyan ZHENG
期刊论文
Design and analysis of a class of redundant collaborative manipulators with 2-dimension large rotational
Xiaodong JIN, Yuefa FANG, Dan ZHANG, Xueling LUO
期刊论文
Evaluation of transmissibility for a class of nonlinear passive vibration isolators
Z. K. PENG, Z. Q. LANG, G. MENG
期刊论文
reference tracking control design for a class of nonlinear systems with time-varying delays
Mei-qin LIU,Hai-yang CHEN,Sen-lin ZHANG
期刊论文
Identification of thermal error in a feed system based on multi-class LS-SVM
Chao JIN, Bo WU, Youmin HU, Yao CHENG
期刊论文