检索范围:
排序: 展示方式:
Design and analysis of a new high frequency double-servo direct drive rotary valve
Muzhi ZHU,Shengdun ZHAO,Jingxiang LI
《机械工程前沿(英文)》 2016年 第11卷 第4期 页码 344-350 doi: 10.1007/s11465-016-0406-x
Researchers have investigated direct drive valve for many years to solve problems, such as fluid force imbalance and switching frequency. The structure of the rotary valve has received considerable research interest because of its favorable dynamic properties and simple structure. This paper studied the high frequency double-servo direct drive rotary valve (DDRV), and proposed a novel structure and drive method satisfying high reversing frequency and adequate quantity of flow. Servo motors are integrated into the valve by the innovative structure, which is designed to equilibrate the unbalanced radial fluid force with the symmetric distributed oil ports. Aside from the fast reversing function of the valve, the DDRV presented high performance in linearity of the flow quantity and valve opening as a result of the fan-shaped flow ports. In addition, a computational fluid dynamics (CFD) method based on Fluent was conducted to verify the flux regulation effect of the height change of the adjustable boss.
关键词: direct drive rotary valve computational fluid dynamics (CFD) flow regulation
Impact drive rotary precision actuator with piezoelectric bimorphs
ZHANG Hongzhuang, ZENG Ping, HUA Shunming, CHENG Guangming, YANG Zhigang
《机械工程前沿(英文)》 2008年 第3卷 第1期 页码 71-75 doi: 10.1007/s11465-008-0008-3
关键词: specific fixed-frequency waveform piezoelectric cantilever mechanisms adjustable-amplitude
Arash Hasssanpour ISFAHANI,Amirhossein Haji-Seyed BOROUJERDI,Saeed HASANZADEH
《能源前沿(英文)》 2014年 第8卷 第2期 页码 182-191 doi: 10.1007/s11708-014-0320-z
关键词: permanent magnet synchronous generator wind turbine direct-drive multi-objective optimization cost mass annual energy output finite element analysis (FEA)
Shoudao HUANG, Xuan WU, Xiao LIU, Jian GAO, Yunze HE
《机械工程前沿(英文)》 2017年 第12卷 第3期 页码 281-302 doi: 10.1007/s11465-017-0442-1
Electric power conversion system (EPCS), which consists of a generator and power converter, is one of the most important subsystems in a direct-drive wind turbine (DD-WT). However, this component accounts for the most failures (approximately 60% of the total number) in the entire DD-WT system according to statistical data. To improve the reliability of EPCSs and reduce the operation and maintenance cost of DD-WTs, numerous researchers have studied condition monitoring (CM) and fault diagnostics (FD). Numerous CM and FD techniques, which have respective advantages and disadvantages, have emerged. This paper provides an overview of the CM, FD, and operation control of EPCSs in DD-WTs under faults. After introducing the functional principle and structure of EPCS, this survey discusses the common failures in wind generators and power converters; briefly reviewed CM and FD methods and operation control of these generators and power converters under faults; and discussed the grid voltage faults related to EPCSs in DD-WTs. These theories and their related technical concepts are systematically discussed. Finally, predicted development trends are presented. The paper provides a valuable reference for developing service quality evaluation methods and fault operation control systems to achieve high-performance and high-intelligence DD-WTs.
关键词: direct-drive wind turbine electric power conversion system condition monitoring fault diagnosis operation control under faults fault tolerance
WANG Zhi, WANG Jianxin, SHUAI Shijin, MA Qingjun, TIAN Guohong
《能源前沿(英文)》 2007年 第1卷 第3期 页码 311-315 doi: 10.1007/s11708-007-0045-3
宋涛,赵升吨,闫观海,刘红宝
《中国工程科学》 2013年 第15卷 第1期 页码 63-67
提出了高速伺服直驱式旋锻机结构,分析设计了基于摆线运动曲线的锤头轮廓曲线,采用上限法确定了旋锻机在极限工况下的最大输出载荷上限的变化规律。研究表明,随着进料角的增大,锻机负载有所降低,但同时工件需要更大的推进力,因此实际中采用的进料角的范围为5°~15°。
System construction of a four-side primary permanent-magnet linear motor drive mechanical press
Jintao LIANG, Zhengfeng MING, Peida LI
《机械工程前沿(英文)》 2020年 第15卷 第4期 页码 600-609 doi: 10.1007/s11465-020-0597-z
关键词: mechanical press direct drive primary permanent-magnet linear motor (PPMLM) servo system active disturbance rejection control (ADRC) prototype experiment
Novel piezoelectric pump with “E”-shaped valve found from sub-experiments
Jianhui ZHANG, Jun HUANG, Xiaoqi HU, Qixiao XI,
《机械工程前沿(英文)》 2010年 第5卷 第2期 页码 212-218 doi: 10.1007/s11465-010-0009-x
关键词: piezoelectricity valve pump experiment “ E” -shaped valve
Soybean drying characteristics in microwave rotary dryer with forced convection
Ruifang WANG, Zhanyong LI, Yanhua LI, Jingsheng YE
《化学科学与工程前沿(英文)》 2009年 第3卷 第3期 页码 289-292 doi: 10.1007/s11705-009-0022-y
Electromagnetic interference modeling and suppression techniques in variable-frequency drive systems
Le YANG, Shuo WANG, Jianghua FENG
《机械工程前沿(英文)》 2018年 第13卷 第3期 页码 329-353 doi: 10.1007/s11465-018-0466-1
Electromagnetic interference (EMI) causes electromechanical damage to the motors and degrades the reliability of variable-frequency drive (VFD) systems. Unlike fundamental frequency components in motor drive systems, high-frequency EMI noise, coupled with the parasitic parameters of the trough system, are difficult to analyze and reduce. In this article, EMI modeling techniques for different function units in a VFD system, including induction motors, motor bearings, and rectifier-inverters, are reviewed and evaluated in terms of applied frequency range, model parameterization, and model accuracy. The EMI models for the motors are categorized based on modeling techniques and model topologies. Motor bearing and shaft models are also reviewed, and techniques that are used to eliminate bearing current are evaluated. Modeling techniques for conventional rectifier-inverter systems are also summarized. EMI noise suppression techniques, including passive filter, Wheatstone bridge balance, active filter, and optimized modulation, are reviewed and compared based on the VFD system models.
关键词: variable-frequency drive (VFD) electromagnetic interference (EMI) motor drive modeling EMI noise suppression
张德华,王梦恕
《中国工程科学》 2009年 第11卷 第7期 页码 92-96
DX桩是近年来新兴的一种变截面新桩型。是在钻孔灌注桩的基础上,使用专用挤扩设备在桩底和桩身挤扩成为支盘状,然后浇灌混凝土后形成的桩身、分承力盘和桩根共同承载的桩型。DX桩可较大幅度提高单桩承载力。试验表明单桩承载力比同等条件下的直孔灌注桩提高80 %以上。DX桩可在粘性土、粉土、砂土层、强风化岩、残积土中挤扩承力盘,也可在卵砾石层的上层面挤扩成盘,更适宜在粘性土、粉土或砂土交互分层的地基中使用。DX桩的桩身直径可为400~2 000 mm,桩长可达60多米。是一种值得推广应用的新桩型,已在高层建筑、公路桥
Nonlinear sealing force of a seawater balance valve used in an 11000-meter manned submersible
《机械工程前沿(英文)》 2023年 第18卷 第1期 doi: 10.1007/s11465-022-0726-y
关键词: seawater balance valve sealing performance hybrid ANE model FEM minimum sealing force equation
Xi WU, Hong YE, Jianxiang WANG, Jie HE, Jian YANG
《能源前沿(英文)》 2012年 第6卷 第2期 页码 193-199 doi: 10.1007/s11708-012-0184-z
关键词: thermophotovoltaic (TPV) system rotary regenerator effectiveness carryover loss
Artificial bee colony optimization for economic dispatch with valve point effect
Yacine LABBI,Djilani Ben ATTOUS,Belkacem MAHDAD
《能源前沿(英文)》 2014年 第8卷 第4期 页码 449-458 doi: 10.1007/s11708-014-0316-8
关键词: artificial bee colony (ABC) algorithm economic dispatch (ED) valve-point effect optimization
Development of a novel two-stage proportional valve with a pilot digital flow distribution
Qiang GAO, Yuchuan ZHU, Changwen WU, Yulei JIANG
《机械工程前沿(英文)》 2021年 第16卷 第2期 页码 420-434 doi: 10.1007/s11465-020-0622-2
关键词: two-stage proportional valve digital flow distribution high-speed on/off valve position tracking characteristic dynamic performance
标题 作者 时间 类型 操作
Design and analysis of a new high frequency double-servo direct drive rotary valve
Muzhi ZHU,Shengdun ZHAO,Jingxiang LI
期刊论文
Impact drive rotary precision actuator with piezoelectric bimorphs
ZHANG Hongzhuang, ZENG Ping, HUA Shunming, CHENG Guangming, YANG Zhigang
期刊论文
Multi-objective design optimization of a large-scale direct-drive permanent magnet generator for wind
Arash Hasssanpour ISFAHANI,Amirhossein Haji-Seyed BOROUJERDI,Saeed HASANZADEH
期刊论文
Overview of condition monitoring and operation control of electric power conversion systems in direct-drive
Shoudao HUANG, Xuan WU, Xiao LIU, Jian GAO, Yunze HE
期刊论文
Control of homogeneous charge compression ignition combustion in a two-cylinder gasoline direct injectionengine with negative valve overlap
WANG Zhi, WANG Jianxin, SHUAI Shijin, MA Qingjun, TIAN Guohong
期刊论文
System construction of a four-side primary permanent-magnet linear motor drive mechanical press
Jintao LIANG, Zhengfeng MING, Peida LI
期刊论文
Novel piezoelectric pump with “E”-shaped valve found from sub-experiments
Jianhui ZHANG, Jun HUANG, Xiaoqi HU, Qixiao XI,
期刊论文
Soybean drying characteristics in microwave rotary dryer with forced convection
Ruifang WANG, Zhanyong LI, Yanhua LI, Jingsheng YE
期刊论文
Electromagnetic interference modeling and suppression techniques in variable-frequency drive systems
Le YANG, Shuo WANG, Jianghua FENG
期刊论文
Effectiveness analysis and optimum design of the rotary regenerator for thermophotovoltaic (TPV) system
Xi WU, Hong YE, Jianxiang WANG, Jie HE, Jian YANG
期刊论文
Artificial bee colony optimization for economic dispatch with valve point effect
Yacine LABBI,Djilani Ben ATTOUS,Belkacem MAHDAD
期刊论文