A Hypersonic Cruise Flight Vehicle High-precision Control Method Using Compound Rudder Surface

2016 ◽  
Author(s):  
Jianli Wei ◽  
Cong Wang ◽  
Yongqin Xu ◽  
Jie Yan
Keyword(s):  
High Precision ◽  
Control Method ◽  
Flight Vehicle ◽  
Precision Control ◽  
Cruise Flight

High-precision control method for the satellite with large rotating components

2019 ◽  
Vol 92 ◽  
pp. 91-98 ◽  
Author(s):  
Feng Wang ◽  
Chi Wang ◽  
Xue-qin Chen ◽  
Cheng-fei Yue ◽  
Yi-fei Xie ◽  
...  
Keyword(s):  
High Precision ◽  
Control Method ◽  
Precision Control

Digital Control System Design of Carving Machine Based on DSP

2012 ◽  
Vol 503-504 ◽  
pp. 1343-1346
Author(s):  
Zhong Jin Ni ◽  
Liang Fang ◽  
Mao Jun Chen
Keyword(s):  
Control System ◽  
High Precision ◽  
Digital Control ◽  
Control Method ◽  
Control System Design ◽  
Digital Control System ◽  
Servo Motor ◽  
System Operation ◽  
Precision Control ◽  
Motor Controller

A digital control system of high-precision carving machine is presented in this paper. According to the requirements of high-precision caving machine, a servo motor controller based on the field orientated control (FOC) strategy is applied. Thus the high-precision control system base on DSP of electronic carving machine is realized. The results of system operation are shown that the control system and the servo motor controllers can run steadily and precisely. The system also represent that inter - connected controls parameters of this system were correct and valid, the control method was proper and effective

Addressing Closed-Chain Dynamics for High-Precision Control of Hydraulic Cylinder Actuated Manipulators

2018 ◽  
Author(s):  
Janne Koivumäki ◽  
Wen-Hong Zhu ◽  
Jouni Mattila
Keyword(s):  
High Precision ◽  
Inverse Dynamics ◽  
Control Method ◽  
System Modeling ◽  
Hydraulic Cylinder ◽  
Control Methods ◽  
Open Chain ◽  
Precision Control ◽  
Closed Chain ◽  
Highly Nonlinear

Nonlinear model-based (NMB) control methods have been shown (both in theory and in practice) to provide the most advanced control performance for highly nonlinear hydraulic manipulators. In these methods, the inverse dynamics of a system are used to proactively generate the system actuation forces from the desired motion dynamics. To model the inverse dynamics in articulated systems, the Lagrange dynamics and the Newton-Euler dynamics are the most common methods. In hydraulic cylinder actuated manipulators, a linear motion of the cylinder can be converted to a rotational joint motion between two links, creating closed-chain structures in the system. In Lagrange-dynamics-based control methods, the closed-chain structures are typically treated as an open-chain structure, which may raise the question of inaccurate system modeling. Contrary, the virtual decomposition control (VDC) approach is the first rigorous NMB control method to take full advantage of Newton-Euler dynamics, allowing to address the system nonlinear dynamics without imposing additional approximations. In VDC, the actuated closed-chain structures can be virtually decomposed to open chain structures. To address the dynamics between the decomposed open chains, three specific terms (namely two load distribution factors and an internal force vector) need to be addressed. However, analytical solutions for these terms cannot be found in the literature. This paper provides the detailed solutions for these terms, which are further needed in a high-precision control of hydraulic robotic manipulators.

Precast Pavement Smoothness Control Method

2014 ◽  
Vol 587-589 ◽  
pp. 1071-1074 ◽  
Author(s):  
Peng Peng ◽  
De Fen Wu ◽  
Bo Tian ◽  
Kai Min Niu
Keyword(s):  
Control Method ◽  
Control Measure ◽  
Road Maintenance ◽  
Precision Control ◽  
Service Effectiveness ◽  
Base Course

In the course of road maintenance, importance has been gradually attached by administrative authorities to precast pavement for its advantages like quickness, endurance and eco-friendliness. To ensure the smoothness of precast pavement, analyses and researches were done in terms of, say, precast pavement slab precision control, base course treatment, fabricated pavement slab leveling and treatment of joint faulting, and a control measure to ensure and improve the smoothness of precast pavement is suggested with consideration given to its service effectiveness in actual projects.

Design of a High-Precision Flyback Constant Voltage AC–DC Converter

2017 ◽  
Vol 26 (11) ◽  
pp. 1750175
Author(s):  
Changyuan Chang ◽  
Chao Hong ◽  
Yang Xu ◽  
Hailong Sun ◽  
Yao Chen
Keyword(s):  
High Precision ◽  
Output Voltage ◽  
Control Method ◽  
Switching Frequency ◽  
Constant Voltage ◽  
Light Load ◽  
Wave Generator ◽  
Load Regulation ◽  
High Output

A constant voltage AC–DC converter based on the digital assistant technology is proposed in this paper, which has the advantage of high output precision. In this paper, a novel digital exponential wave generator is adopted in Constant Voltage (CV) mode to replace the normal triangle waveform to obtain a wider range of switching frequency, increasing the accuracy of output voltage under light load. The control chip is implemented based on NEC 1[Formula: see text][Formula: see text]m 5[Formula: see text]V/40[Formula: see text]V HVCMOS process, and a 5[Formula: see text]V/1.2[Formula: see text]A prototype has been built to verify the proposed control method. In PFM mode the deviation of output voltage is within [Formula: see text]% and the load regulation is [Formula: see text]%. Meanwhile, when the load jumps from light to heavy, the minimum output voltage could be maintained above 4.16[Formula: see text]V.

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