Dynamic Modeling and Analysis of the Horizontal Folding Machine System for Nonwoven Web Quality Control
| Autor: | Cheng-chih Tsai, 蔡政志 |
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| Rok vydání: | 2006 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 94 Control of the carriage steady at a speed is crucial when one wants to advance the state of the art with higher productivity and efficiency to fabric folding machine systems. Three steps are necessary. First, a good design based model of the plant needs to be developed. Second, a good realizable actuator, sensor, and controller must exist. Third, the system output should be modified using the knowledge of the system dynamic response. This dissertation presents a complete control strategy for a fabric folding machine system, and the system mathematical modeling, dynamic analysis, linearization, and controller design are illustrated. A very realizable actuator and a sensor, which uses a motor and an encoder, are applied to design the control system. The computer simulation results for linear and nonlinear system models indicate that the system steady-state errors for this designed controller can be eliminated and good tracking property can be achieved as well. Traditional folding machine system is a stable but sluggish with large steady state errors according to the carriage unit step velocity input. Therefore, it is valuable to develop a realizable controller which can not only make the closed-loop system efficient for good tracking property but also can achieve the meaningful design objectives. In this dissertation, the modeling, stability, model reduction, dynamic analysis and controller design for a folding machine system are presented. The control system performance can be effectively seen from the computer simulation. Proportional plus Integral control (PI) scheme was presented to show the control strategy and design effort of the folding machine system. Although the PI controller not only can eliminate the steady-state error, but also can get the specified damping ratio and undamped natural frequency for a pair of dominant closed loop poles, the response still exist overshoot. Due to a pair of dominant closed loop poles can be designed for a folding machine system, in this dissertation, corresponding with the regulated input command to obliterate the overshoot for achieving precise trajectory tracking and settling-time optimal control will be demonstrated. At the same time, the folding machine system drives frequently use microprocessors, developing a mathematical and computational tool that will ultimately lead to the design of real-time controllers for this system can be visible through this dissertation. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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