Speed- and Range-based Filter Design for Dual-Stage Actuator Control

2021 ◽  
pp. 1-9
Author(s):  
James Peyton-Jones ◽  
Aleksandra Mitrovic ◽  
G. M. Clayton
Keyword(s):  
Filter Design ◽  
Low Frequency ◽  
Response Characteristics ◽  
Speed Range ◽  
Dual Stage ◽  
The Individual ◽  
Actuator Control ◽  
Different Characteristics ◽  
Dual Stage Actuator ◽  
First Time

Abstract Dual-stage actuators, which combine two actuators with different characteristics, have gained interest due to their large-range, high-resolution positioning capabilities. Control of such systems is challenging because it requires balancing the relative contributions of the individual actuators in terms of speed, range and precision. The most common approach is to allocate effort to the actuators based on frequency but this can lead to misallocation in the case of low-frequency short-range trajectories. In this paper, the problem of trajectory allocation in dual-stage actuator systems is addressed using a recently developed range-based filter. The theoretical basis of the range-based filter is rigorously derived for the first time and insights regarding its use, specifically its reinterpretation as a speed-based filter, and its range-frequency response characteristics are presented. The new analysis not only explains the behavior of the filter clearly, but it provides a more robust strategy for incorporating range constraints in filter design for different desired trajectories.

Dynamic Modeling and Control of a Piezo-Electric Dual-Stage Tape Servo Actuator

2008 ◽  
Author(s):  
Uwe Boettcher ◽  
Bart Raeymaekers ◽  
Raymond A. de Callafon ◽  
Frank E. Talke
Keyword(s):  
Low Frequency ◽  
Voice Coil Motor ◽  
Step Response ◽  
Time Model ◽  
Modeling And Control ◽  
Micro Actuator ◽  
Single Output ◽  
Lateral Tape Motion ◽  
Dual Stage ◽  
Dual Stage Actuator

We have implemented the design of a dual-stage actuator tape head for enhanced reduction of lateral tape motion (LTM) disturbance. Our design consists of a conventional voice coil motor (VCM) and a micro-actuator for coarse and fine positioning, respectively. The micro-actuator, which is mounted on the VCM, uses a piezo crystal and allows following LTM up to the kHz regime, while the VCM follows low frequency LTM. Using step response measurements and a realization algorithm, we have created a multi-input discrete-time model of the dual-stage actuator. Based on the model, we designed and implemented a dual-stage controller, using a dual-input single-output approach based on a PQ method. The dual-stage controller controls the position of both actuators and enables an increased track-following bandwidth along with a control signal that is smaller in magnitude than that for a conventional single-stage tape head.

Optimal Sliding Mode Dual-Stage Actuator Control in Computer Disk Drives

2010 ◽  
Vol 132 (4) ◽  
Author(s):  
Seung-Hi Lee
Keyword(s):  
Discrete Time ◽  
Sliding Mode ◽  
Voice Coil Motor ◽  
Disk Drives ◽  
Flexible Mode ◽  
Control Scheme ◽  
Dual Stage ◽  
Actuator Control ◽  
Dual Stage Actuator ◽  
Computer Disk

This paper presents a discrete-time design of a dual-stage actuator control system with sliding mode for computer disk drives. A state estimator based discrete-time boundary layer sliding mode control scheme is developed for a dual-stage actuator, which consists of a voice coil motor and a microactuator. Considering dominant microactuator flexible mode dynamics and the interaction between the two actuators, an optimal sliding hyperplane is designed to maximize their cooperation so as to attain desired responses. An application example demonstrates the utility of the proposed sliding mode dual-stage actuator control scheme for track-seek in the microactuator range, settle, and track-follow.

scholarly journals Surveillance, social punishment, and the viability of Homo Virtualis

2019 ◽  
Vol 2 (1) ◽  
pp. 101
Author(s):  
Robert C. Mellon
Keyword(s):  
Antisocial Behavior ◽  
Positive Reinforcement ◽  
Homo Sapiens ◽  
Low Frequency ◽  
Online Activity ◽  
Massive Scale ◽  
Credible Threat ◽  
The Individual ◽  
First Time ◽  
Highly Evolved

As emerging encryption technology results in widespread freedom from detection of online activity, Homo Virtualis might usefully be considered as Homo sapiens without a gun to its head—a highly evolved species experiencing, for the first time on a massive scale, a home environment in which the individual who engages in acts that harm others is not identifiable. This renders the punishment of antisocial behavior in this context impossible, clearing the warning signals for retribution and crippling this ancient and brutal method for limiting the occurrence of antisocial or unwanted behavior. If Homo Virtualis is to retain this newfound freedom from threat and invigilation, prosocial behavior must continue to prevail in the absence of credible threat of punishment for the antisocial. The prospects are far from certain, and an attendant spike in the frequency of misdeed would be sure to evoke a crackdown on encryption tech. On the bright side, a widespread failure of punishment to inhibit malice and malfeasance online might finally evoke serious consideration of how H. sapiens might ensure a low frequency of antisocial behavior absent the threat of dire consequence for transgression, via the positive reinforcement of prosocial conduct, rendering interpersonal and community sensitivity and service pleasurable rather than obligatory. Encryption technologies can provide valuable support for such a comprehensively humanistic effort to reduce malfeasance by eliminating threats of public censure for current and budding offenders’ own efforts to address their problematic proclivities.

Sign in / Sign up

Export Citation Format

Share Document