scholarly journals Analysis and Control of Settling Process of High-Speed, High-Precision Positioning Mechanism. 1st Report, Modeling and Computer Simulation.

1994 ◽  
Vol 60 (573) ◽  
pp. 1676-1684
Author(s):  
Hiroshi Yamaura ◽  
Kyosuke Ono ◽  
Shigeyuki Yanagimachi
Keyword(s):  
Computer Simulation ◽  
High Precision ◽  
High Speed ◽  
Precision Positioning ◽  
And Control ◽  
Settling Process

Design and Control of Planar Parallel Mechanisms with High Speed and High Precision

2006 ◽  
Vol 315-316 ◽  
pp. 872-0
Author(s):  
L.N. Sun ◽  
Y.J. Liu ◽  
J. Li ◽  
J. Cui
Keyword(s):  
High Precision ◽  
Disturbance Observer ◽  
High Speed ◽  
Optimization Design ◽  
Advanced Manufacturing ◽  
Parallel Mechanisms ◽  
Direct Drive ◽  
End Effector ◽  
Load Disturbance ◽  
And Control

In order to satisfy the requirement of advanced manufacturing equipments with high speed and high precision, two planar parallel mechanisms have been developed. Based on these mechanisms, firstly, in consideration with the velocity and the precision of the end-effector together, the dimension optimization design is performed based on conditioning index and the precision characteristics. Then a disturbance observer is designed for the purpose of restraining load disturbance in the direct-drive system, and the experimental results show that load disturbance can be effectively restrained by the disturbance observer.

Vibration Control of a Slider Pendulum-Type Loader Arm Driven by a Software-Cam Curve

1989 ◽  
Vol 1 (3) ◽  
pp. 173-178
Author(s):  
Kazuo Yamafuji ◽  
◽  
Tetsuya Komine ◽  
Keyword(s):  
Computer Simulation ◽  
Vibration Control ◽  
Personal Computer ◽  
High Speed ◽  
Experimental Results ◽  
Control Methods ◽  
Residual Vibration ◽  
Swing Angle ◽  
Sine Curve ◽  
And Control

This paper describes the control methods, computer simulation and experimental results on the vibration control of the loader arm which is composed of a horizontal slider and a pendulum-type arm suspended from it. In order to achieve high-speed driving and accurate positioning of the loader arm without residual vibration, one of the software-cam curves, termed the ""modified sine curve,"" was applied to drive the loader. The cam curve was described numerically on a personal computer. Three control methods together with highgain feedback control are proposed, in which the path and velocity of the slider and the swing angle of the arm are controlled according to the prescribed software curves. Experimental results show that driving of the loader with such a software curve and control of it under the limitation of the maximum swing angle of the arm are very effective for rejection of residual vibration and accurate positioning of the loader.

scholarly journals A Collaborative Approach to Teach Modeling and Control of Smart Actuators in the Mechanical Engineering Curriculum

2007 ◽  
Author(s):  
Kam K. Leang ◽  
Gina Pannozzo ◽  
Qinze Zou ◽  
Santosh Devasia
Keyword(s):  
High Precision ◽  
Electric Motor ◽  
Mechanical Engineering ◽  
Piezo Actuator ◽  
Collaborative Approach ◽  
Precision Positioning ◽  
Modeling And Control ◽  
Teaching Module ◽  
Smart Actuators ◽  
And Control

In this article, we describe a collaborative approach to develop, integrate, and assess a teaching module on smart actuators specifically designed to embed topics in nano/bio technology into the undergraduate mechanical engineering (ME) curriculum. The collaboration involves three universities, each focusing on one specific aspect of the module. The module consists of lectures and laboratory activities that cover modeling and control of smart actuators for courses such as system dynamics, controls, and mechatronics. The integration of smart actuators — such as piezoelectric, shape memory alloy (SMA), and magnetostrictive based devices — into the ME curriculum is important because these devices are the workhorse in a multitude of nano and bio technologies. Thus, these devices play a critical role in the emerging areas, analogous to the benefits of the electric motor at the macroscale. But contrast to the well established coverage of the electric motor in the ME curriculum, modeling and control of smart actuators has yet to be systematically presented in core ME courses. The contribution of this article is presenting the systematic development, integration, and assessment of a teaching module on smart actuators. We first describe the design of lecture components using the piezo actuator as an example. The lecture materials cover core concepts within the framework of dynamics and controls, such as electromechanical coupling, dynamic response, nonlinear input-output behavior, and PID feedback control technique for high-precision positioning. Afterwards, we describe the development of a hands-on laboratory experiment designed to expose students to the basics of experimental modeling of the piezo actuator. The platform is also suited for basic control applications, and an example is presented to illustrate the application of piezo actuator control for high-precision positioning. The paper concludes with a discussion on how the module will be implemented and assessed at the three participating universities.

High Precision Hybyid Technology Using Dual-Stage of Linear Motor and Piezo-Actuator for Milling Machine

2007 ◽  
Author(s):  
B. M. Chung ◽  
I. J. Yeo ◽  
T. J. Ko ◽  
J. K. Park
Keyword(s):  
High Precision ◽  
High Speed ◽  
Piezo Actuator ◽  
Precision Positioning ◽  
Positional Accuracy ◽  
Linear Motors ◽  
Machining System ◽  
Dual Stage ◽  
Stage System ◽  
Long Stroke

High precision machining technology has become one of the important parts in the development of a precision machine. Such a machine requires high speed on a large workspace as well as high precision positioning. For machining systems having a long stroke with ultra precision, a dual-stage system including a global stage (coarse stage) and a micro stage (fine stage) is designed in this paper. Though linear motors have a long stroke and high precision feed drivers, they have some limitations for submicron positioning. Piezo-actuators with high precision also have severe disadvantage for the travel range, and the stroke is limited to a few microns. In the milling experiments, the positional accuracy has been readily achieved within 0.2 micron over the typical 20 mm stroke, and the path error over 2 micron was reduced within 0.2 micron. Therefore, this technique can be applied to develop high precision positioning and machining in the micro manufacturing and machining system.

Dynamic and Control Modeling and Simulation of High Speed Precision Positioning XY Table

2011 ◽  
Vol 467-469 ◽  
pp. 978-983
Author(s):  
Zhi Peng Ma ◽  
Xing Yu Zhao ◽  
Fu Jun Wang ◽  
Da Wei Zhang
Keyword(s):  
Control Strategy ◽  
High Speed ◽  
Closed Loop ◽  
Dynamic Performance ◽  
Matching Law ◽  
Closed Loop Control ◽  
Precision Positioning ◽  
Loop Control ◽  
Decoupling Mechanism ◽  
And Control

To study the dynamic performance and control strategy of a kind of high speed precision positioning XY table with a new kind of decoupling mechanism, the electromechanical co-simulation model with three closed-loop control system using proportional–integral–derivative controller (PID controller) is constructed. By use of finite element analysis (FEA) and co-simulation method, the preloaded spring as the key component in the decoupling mechanism is optimized. The matching law of the spring stiffness and preload is presented. The decoupling mechanism influence on the dynamic performance of the XY table during the movement is fully discussed. Based on the electromechanical model, a three closed-loop control scheme with disturbance observer and feed-forward controller is proposed. Co-simulation results demonstrate the validity of the control strategy.

Sign in / Sign up

Export Citation Format

Share Document