scholarly journals Micro-positioning of linear piezoelectric motors based on a learning nonlinear PID controller

2002 ◽  
Author(s):  
H. Zhou ◽  
K.K. Tan ◽  
T.H. Lee
Keyword(s):  
Pid Controller ◽  
Piezoelectric Motors ◽  
Nonlinear Pid Controller

A Nonlinear Feedback Control Scheme for Transient Performance Enhancement in Hard Disk Drives

2014 ◽  
Author(s):  
Minghui Zheng ◽  
Xu Chen ◽  
Masayoshi Tomizuka
Keyword(s):  
Steady State ◽  
Pid Controller ◽  
Control Algorithm ◽  
Hard Disk Drives ◽  
Hard Disk ◽  
Disk Drives ◽  
Transient Performance ◽  
Nonlinear Feedback ◽  
Nonlinear Pid Controller ◽  
Steady State Performance

This paper aims to develop a nonlinear control algorithm to break the limitations of linear PID controls and improve the transient performance during the short-span track seeking / settling in hard disk drives (HDDs). It is designed based on a baseline PID controller which is well-designed to obtain good track following performance. The control algorithm is a combination of a nonlinear PID controller and a nonlinear turbo controller (NTC): when the position error signal (PES) is large, NTC assists the nonlinear PID controller to rapidly reduce the error; when PES is small, NTC is turned off to avoid possible chattering and ensure good steady state performance. As PES becomes even smaller, the nonlinear PID controller is reduced to the baseline PID controller to keep good steady state performance.

A Design of Nonlinear PID Controller with Neural net based FRIT

2012 ◽  
Vol 45 (3) ◽  
pp. 81-85 ◽  
Author(s):  
Yoshihiro Ohnishi ◽  
Shin Wakitani ◽  
Toru Yamamoto
Keyword(s):  
Pid Controller ◽  
Neural Net ◽  
Nonlinear Pid Controller
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