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Control algorithm of a servo platform
Shouyong XIE, Xiwen LI, Shuzi YANG, Mingjin YANG,
《机械工程前沿(英文)》 2010年 第5卷 第3期 页码 353-355 doi: 10.1007/s11465-010-0098-6
关键词: grey prediction proportional integral derivative (PID) control improved algorithm weight servo platform
六自由度并联平台特性分析及其电液位置伺服系统的CMAC神经网络控制
翟传润,战兴群,张炎华,冉祥耒,赵克定
《中国工程科学》 2001年 第3卷 第10期 页码 36-40
以六自由度运动平台为研究对象,分析了平台的运动学和动力学问题,采用了CMAC神经网络作为控制器,实现运动轨迹的跟踪。仿真表明所作的运动学、动力学分析是正确的,控制器具有较强的抗负载干扰能力和良好的鲁棒性。
Model-based nonlinear control of hydraulic servo systems: Challenges, developments and perspectives
Jianyong YAO
《机械工程前沿(英文)》 2018年 第13卷 第2期 页码 179-210 doi: 10.1007/s11465-018-0464-3
Hydraulic servo system plays a significant role in industries, and usually acts as a core point in control and power transmission. Although linear theory-based control methods have been well established, advanced controller design methods for hydraulic servo system to achieve high performance is still an unending pursuit along with the development of modern industry. Essential nonlinearity is a unique feature and makes model-based nonlinear control more attractive, due to benefit from prior knowledge of the servo valve controlled hydraulic system. In this paper, a discussion for challenges in model-based nonlinear control, latest developments and brief perspectives of hydraulic servo systems are presented: Modelling uncertainty in hydraulic system is a major challenge, which includes parametric uncertainty and time-varying disturbance; some specific requirements also arise ad hoc difficulties such as nonlinear friction during low velocity tracking, severe disturbance, periodic disturbance, etc.; to handle various challenges, nonlinear solutions including parameter adaptation, nonlinear robust control, state and disturbance observation, backstepping design and so on, are proposed and integrated, theoretical analysis and lots of applications reveal their powerful capability to solve pertinent problems; and at the end, some perspectives and associated research topics (measurement noise, constraints, inner valve dynamics, input nonlinearity, etc.) in nonlinear hydraulic servo control are briefly explored and discussed.
关键词: hydraulic servo system adaptive control robust control nonlinear friction disturbance compensation repetitive control noise alleviation constraint control
Gray-box modeling and QFT control for precision servo transmission systems
Xiulan BAO, Xuedong CHEN, Xin LUO, Haocheng ZUO
《机械工程前沿(英文)》 2011年 第6卷 第4期 页码 442-448 doi: 10.1007/s11465-011-0242-y
Precision servo transmission systems have widely been applied in industrial equipment to achieve high accuracy and high speed motion. However, due to the presence of friction and uncertainty, the characteristics of precision servo transmission systems are variant depends on the working conditions, leading to oscillation and instability in the system performances. In this paper, a grey-box model of the system is established, the model structure derived from the theoretical modeling and the model parameters are obtained by experiments using set membership identification method. This paper proposes two-degrees of freedom (2-DOF) robust position controller for a precision servo transmission system, based on the quantitative feedback theory (QFT), to achieve high accuracy and consistent tracking performance even in presence of considerable system uncertainties and friction disturbances. The results of simulate and experiment validate the effectiveness of the proposed controller.
关键词: precision servo transmission system modeling set membership identification quantitative feedback theory (QFT) robustness
Modeling and analysis of steady-state vibration induced by backlash in servo rotary table
Xiao YANG,Dun LU,Sanli LIU,Jun ZHANG,Wanhua ZHAO
《机械工程前沿(英文)》 2015年 第10卷 第1期 页码 43-47 doi: 10.1007/s11465-015-0327-0
Backlash cannot be always avoided in mechanical systems because of wear or looseness. Steady-state vibration may be induced by backlash in closed loop feed drive systems. This paper presents a mathematical model of a servo rotary table, considering the effect of backlash. The accuracy of this model is verified by an experiment. The influences of the parameters, such as position controller gain, velocity controller gain, load and the magnitude of backlash, on steady-state vibration are discussed. The steady-state vibration amplitude increases with the position controller gain, load and the magnitude of backlash. The steady-state vibration frequency increases with the position controller gain and the velocity controller gain, while an increase in load leads to a decrease in the frequency.
The CatMath: an online predictive platform for thermal + electrocatalysis
《化学科学与工程前沿(英文)》 2023年 第17卷 第12期 页码 2156-2160 doi: 10.1007/s11705-023-2371-3
关键词: CatMath catalysis volcano activity plots Surface Pourbaix Diagrams online platform
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
关键词: acceleration reconfigurable parallel additive sequence parallel mechanism
Experimental Study on the Piezoelectric Prestage Driver of Electrohydraulic Servo Valves
CHENG Guang-ming, SHEN Chuan-liang, YANG Zhi-gang
《机械工程前沿(英文)》 2006年 第1卷 第1期 页码 56-59 doi: 10.1007/s11465-005-0017-4
A piezoelectric actuated prestage driver of hydraulic servo valves for the low-frequency response of electrohydraulic servo valve electromagnetic prestage driver was presented. The new driver was driven by piezoelectric multilayer actuators. The displacement of a piezoelectric multilayer actuator was amplified by a flexure-hinged amplifier based on the principles of triangle amplification. Static and dynamic characteristics were tested on the model machine. The characteristics of good linearity, high resolution, and high-frequency response were approved. The natural frequency reached 1.201 kHz using finite element analysis, and the practice measurement result was 1 kHz.
关键词: flexure-hinged amplifier kHz amplification high-frequency electromagnetic
Kinematic Model Building and Servo Parameter Identification of 3-HSS Parallel Mechanism
YANG Zhi-yong, WU Jiang, HUANG Tian, NI Yan-bing
《机械工程前沿(英文)》 2006年 第1卷 第1期 页码 60-66 doi: 10.1007/s11465-005-0019-2
Aiming at a parallel mechanism with three degrees of freedom, a method for dynamic model building and the parameter identification of its servosystem is presented. First, the reverse solution models of position, velocity, and acceleration of parallelogram branch structure are deduced, and then, its dynamic model of a rigid body is set up by using the virtual work principle. Based on the above model, a method to identify the servo parameter of the parallel mechanism is put up. In this method, the triangle-shaped input with variable frequency is adopted to offset the disadvantages of pseudorandom number sequence in parameter identification, such as dramatically changing the vibration amplitude of the motor, easily impacting the motor that results in its velocity loop to easily open, and so on. Moreover, the rotary inertia can also be identified by the additive mass. The abovementioned data will lay a solid foundation for the optimum performance of the system in the whole workspace.
关键词: building acceleration additive workspace optimum performance
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
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°。
Micro-optical fabrication by ultraprecision diamond machining and precision molding
Hui LI, Likai LI, Neil J. NAPLES, Jeffrey W. ROBLEE, Allen Y. YI
《机械工程前沿(英文)》 2017年 第12卷 第2期 页码 181-192 doi: 10.1007/s11465-017-0444-z
Ultraprecision diamond machining and high volume molding for affordable high precision high performance optical elements are becoming a viable process in optical industry for low cost high quality microoptical component manufacturing. In this process, first high precision microoptical molds are fabricated using ultraprecision single point diamond machining followed by high volume production methods such as compression or injection molding. In the last two decades, there have been steady improvements in ultraprecision machine design and performance, particularly with the introduction of both slow tool and fast tool servo. Today optical molds, including freeform surfaces and microlens arrays, are routinely diamond machined to final finish without post machining polishing. For consumers, compression molding or injection molding provide efficient and high quality optics at extremely low cost. In this paper, first ultraprecision machine design and machining processes such as slow tool and fast too servo are described then both compression molding and injection molding of polymer optics are discussed. To implement precision optical manufacturing by molding, numerical modeling can be included in the future as a critical part of the manufacturing process to ensure high product quality.
关键词: ultraprecision machining slow tool servo fast tool servo compression molding injection molding microlens arrays optical fabrication
一种同时控制非完整约束底盘和机械臂的混合视觉伺服方法 Research Articles
李玮,熊蓉
《信息与电子工程前沿(英文)》 2021年 第22卷 第2期 页码 141-286 doi: 10.1631/FITEE.1900460
魏巍,王宇飞,陶永
《中国工程科学》 2020年 第22卷 第4期 页码 34-41 doi: 10.15302/J-SSCAE-2020.04.014
产品设计是提高产品质量和降低制造成本的关键环节,而云制造作为一种新的制造模式和集成技术正逐渐兴起,成为先进制造的重要发展方向。为了应对传统制造业向服务型和创新型制造业转变的挑战,本文在分析协同设计领域现状的基础上,总结了传统制造模式对海量资源共享和按需使用方面存在的问题。研究提出了一种基于云制造的产品协同设计平台架构,详细阐述了平台架构的各子层含义,构建云制造产品协同设计平台的云制造、产品族和产品平台、产品协同设计3类关键技术。最后,以某公司部署的云制造产品协同设计平台系统为例,分析了系统架构和功能,比较了云制造模式与传统制造模式在任务分配和任务完成时间上的差异,验证了云制造产品设计平台系统的有效性和优越性,并对该系统的实际应用和未来研
究方向进行了展望。
木质原料制取先进生物燃料正处在大规模产业化的前夜——迎接生物能源第二波浪潮
程 序,石元春
《中国工程科学》 2015年 第17卷 第1期 页码 11-18
近年来在欧美国家和地区出现了一批基于热化学平台、糖平台和羧酸盐平台的新型液、气生物燃料企业。其原料和技术路线与先前第一代生物燃油乃至第二代纤维素乙醇所采用的水解-发酵或酯交换工艺完全不同。突出的特点是使用木质纤维类原料,因而能将原来不能充分利用的木质素及半纤维素所含的能量(约占总能的四成)也转化入最终的生物合成油/气之中。从而为大规模利用林木类废弃/剩余物、能源林/灌木和木变油/气提供了前所未有的机遇。当前这些技术绝大部分已通过中试和示范规模的验证,经济可行性较强,正处于大规模产业化的前夜。用它们制取的多种先进生物燃料还有两个非常大的优点,即均属于所谓的“直接使用”类燃料,能以任何比例与常规汽、柴油掺混,或完全单独用于现有的发动机(不用改装发动机),亦无需像乙醇那样须有专用的储运设施;且均有70 %~90 %的CO2减排效果。我国在此领域也出现了好的苗头,在迎接全球生物能源第二波浪潮的激烈竞争中须也能够占有一席之地。
标题 作者 时间 类型 操作
Model-based nonlinear control of hydraulic servo systems: Challenges, developments and perspectives
Jianyong YAO
期刊论文
Gray-box modeling and QFT control for precision servo transmission systems
Xiulan BAO, Xuedong CHEN, Xin LUO, Haocheng ZUO
期刊论文
Modeling and analysis of steady-state vibration induced by backlash in servo rotary table
Xiao YANG,Dun LU,Sanli LIU,Jun ZHANG,Wanhua ZHAO
期刊论文
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
Experimental Study on the Piezoelectric Prestage Driver of Electrohydraulic Servo Valves
CHENG Guang-ming, SHEN Chuan-liang, YANG Zhi-gang
期刊论文
Kinematic Model Building and Servo Parameter Identification of 3-HSS Parallel Mechanism
YANG Zhi-yong, WU Jiang, HUANG Tian, NI Yan-bing
期刊论文
Design and analysis of a new high frequency double-servo direct drive rotary valve
Muzhi ZHU,Shengdun ZHAO,Jingxiang LI
期刊论文
Micro-optical fabrication by ultraprecision diamond machining and precision molding
Hui LI, Likai LI, Neil J. NAPLES, Jeffrey W. ROBLEE, Allen Y. YI
期刊论文