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Rejecting rotational disturbances on small disk drives using rotational accelerometers

D.Y. Abramovitch
1997 Control Engineering Practice  
This paper expands on previous efforts at using the signal from a rotational accelerometer to minimize the the effects of these disturbances by dealing with several issues that come up: accelerometer beam  ...  Small disk drives are inherently designed for portable applications and thus must be able to reject external shock and vibration.  ...  While improved mechanics and stiffer air bearings have minimized the need for such a system, it is interesting to note that White anticipates the two primary modes of using accelerometers in disk drives  ... 
doi:10.1016/s0967-0661(97)10005-3 fatcat:znvdp4doircyxe24efgg7qk7e4

Mechatronic design of an active printhead alignment mechanism for wide format printing systems

Arnoud Notenboom, Dennis Bruijnen, Eric Homburg, René v.d. Molengraft, Linda v.d. Bedem, Maarten Steinbuch
2007 Mechatronics (Oxford)  
The position of each printhead can be independently controlled for the purpose of printhead alignment, by which print quality is improved without tightening the manufacturing tolerances.  ...  The principle is validated in closed loop by various tests with a realized prototype.  ...  Feedforward is added to improve the performance of the controlled system.  ... 
doi:10.1016/j.mechatronics.2006.10.001 fatcat:5uwreuxdizdrhdbjzhjmrjob4a

A novel self-sensing technique for tapping-mode atomic force microscopy

Michael G. Ruppert, S. O. Reza Moheimani
2013 Review of Scientific Instruments  
The cantilever can be batch fabricated with existing micro electro mechanical system processes.  ...  A microcantilever coated with a single piezoelectric layer is simultaneously used for actuation and deflection sensing.  ...  A feedback resistor R f1 is used to prevent the amplifier from drifting into saturation.  ... 
doi:10.1063/1.4841855 pmid:24387461 fatcat:3nuecz3yc5gy3jayjt7pi5hmwy

Reactive control of isolated unsteady streaks in a laminar boundary layer

Kyle M. Bade, Ronald E. Hanson, Brandt A. Belson, Ahmed M. Naguib, Philippe Lavoie, Clarence W. Rowley
2016 Journal of Fluid Mechanics  
The models are used to tune feedforward and feedback controllers.  ...  Moreover, the model analysis shows that the difference in the convective time delay of the roughness- and actuator-induced disturbances over the control domain must be known with high accuracy for effective  ...  Notably, for k=0 to 1.2 mm, the response of the controlled disturbance quickly reaches the zero-level and does not oscillate, indicative of a properly tuned control system.  ... 
doi:10.1017/jfm.2016.200 fatcat:ilzqg5ulhzfuxhpyvke32hcqfu

Dynamic Load Alleviation in Wake Vortex Encounters

Henrik Hesse, Rafael Palacios
2016 Journal of Guidance Control and Dynamics  
This paper introduces an integrated approach for flexible-aircraft timedomain aeroelastic simulation and controller design suitable for wake encounter situations.  ...  Numerical studies on a high-altitude, long-endurance aircraft demonstrate the reduced-order modeling approach for load calculations in wake vortex encounters over a large parameter  ...  Acknowledgments The authors would like to acknowledge the expert advice by Bing Feng Ng, from Imperial College, in various aspects of the control design.  ... 
doi:10.2514/1.g000715 fatcat:w24qz5vwgjck5jpgpab3vfjadm

Metamaterials: Characteristics, Design and Microwave Applications

Branka. Jokanovic, Riana H Geschke, Theunis S Beukman, Vojislav Milosevic
2010 SAIEE Africa Research Journal  
The authors would like to thank WIPL-D Software for the license and support in advanced modelling of unit cells in section III, and also FEKO for the license and support for the design of the two filters  ...  Steady-state feedforward control is not suitable for unstable systems since the control input is normally expected to be zero in steady-state systems [22] .  ...  Ziegler-Nichol's tuning rule, with a decay ratio of 0.25, is used to obtain the tuning parameters for the PIDNN as presented in Table 4 .  ... 
doi:10.23919/saiee.2010.8531553 fatcat:4d2npiz2lfdeji3d6hvsjwgvri

Control Methods in Data-Storage Systems

Giovanni Cherubini, Chung Choo Chung, William C. Messner, S. O. Reza Moheimani
2012 IEEE Transactions on Control Systems Technology  
This paper presents a comprehensive overview of advanced servo-control methods for data storage.  ...  Index Terms-Control systems, hard-disk drive, holographic data storage, optical-disk drive, scanning-probe data storage, servomechanism, tape drive. Manuscript  ...  Accelerometers are used routinely on high-end drives for feedforward control.  ... 
doi:10.1109/tcst.2011.2176942 fatcat:e6kbabrwwbghhebyb2kidgncrm

Invited Review Article: High-speed flexure-guided nanopositioning: Mechanical design and control issues

Y. K. Yong, S. O. R. Moheimani, B. J. Kenton, K. K. Leang
2012 Review of Scientific Instruments  
of high-bandwidth flexure-guided nanopositioning systems (nanopositioners).  ...  Such nanopositioners are designed to move samples with sub-nanometer resolution with positioning bandwidth in the kilohertz range.  ...  Advanced integral resonant control (IRC) with integral action and a feedforward input u ff . 92 FIG. 20. The feedforward control approach for piezoactuator system.  ... 
doi:10.1063/1.4765048 pmid:23277965 fatcat:i6zxka3bxzee7e2peqbwr5yuky

Intelligent control of a rotary kiln fired with producer gas generated from biomass

Mika Järvensivu, Esko Juuso, Olli Ahava
2001 Engineering applications of artificial intelligence  
The overall structure and main functions of the developed control system are then described with the main emphasis on the control of temperature and lime quality.  ...  In this paper, an intelligent supervisory-level system implemented at one of the major Finnish pulp mills to control a lime kiln fired with producer gas generated from biomass is presented.  ...  The authors wish to thank the staff of the Wisaforest pulp mill for their valuable support and assistance during the project.  ... 
doi:10.1016/s0952-1976(01)00033-1 fatcat:k3nzaezsh5d43kjzumagmxhv6a

Design for Precision: Current Status and Trends

P. Schellekens, N. Rosielle, H. Vermeulen, M. Vermeulen, S. Wetzels, W. Pril
1998 CIRP annals  
Future developments in Precision Engineering require nanometre-or even subnanometre positioningand measuring accuracy, demanding new design concepts with integrated control and error compensation systems  ...  Modelling and analysis of different concepts, systems, and components is required to adapt the progressing design or to confirm its adequacy.  ...  In general, five control loops are required for an AMB system with one d.0.f.  ... 
doi:10.1016/s0007-8506(07)63243-0 fatcat:32xnhiqwnfhpji7e6cllz7tvq4

2021 Index IEEE Transactions on Industrial Electronics Vol. 68

2021 IEEE transactions on industrial electronics (1982. Print)  
The Author Index contains the primary entry for each item, listed under the first author's name.  ...  ., +, TIE May 2021 4190-4198 Feedforward Tuning by Fitting Iterative Learning Control Signal for Precision Motion Systems.  ...  ., +, TIE March 2021 2648-2658 Feedforward Tuning by Fitting Iterative Learning Control Signal for Precision Motion Systems.  ... 
doi:10.1109/tie.2021.3130363 fatcat:5ahkwd5l4fgnvcveiyso6oc6vy

A Survey of Control Issues in Nanopositioning

Santosh Devasia, Evangelos Eleftheriou, S. O. Reza Moheimani
2007 IEEE Transactions on Control Systems Technology  
Nanopositioners are precision mechatronic systems designed to move objects over a small range with a resolution down to a fraction of an atomic diameter.  ...  This paper presents an overview of nanopositioning technologies and devices emphasizing the key role of advanced control techniques in improving precision, accuracy, and speed of operation of these systems  ...  for distributed systems. 5) Control Issues in Distributed Nanopositioning Systems: Control of distributed nanopositioning systems would require on-chip control schemes.  ... 
doi:10.1109/tcst.2007.903345 fatcat:mhyo47fyr5b3tof2i7eozen4bm

High-Speed Control of Electromechanical Transduction: Advanced Drive Techniques for Optimized Step-and-Settle Response of MEMS Micromirrors

2016 IEEE Control Systems  
Micro/Nano Electro Mechanical Systems (MEMS/NEMS) provide the engineer with a powerful set of solutions to a wide variety of technical challenges.  ...  However, because they are mechanical systems, response times can be a limitation.  ...  Acknowledgements The authors would like to thank CrossFiber, Inc. for their loan of the MEMS cross connect mirrors used for the studies present here.  ... 
doi:10.1109/mcs.2016.2584338 fatcat:mgl5wiec2jbf7lya4dy3umrb2a

The Keck Interferometer

M. M. Colavita, P. L. Wizinowich, R. L. Akeson, S. Ragland, J. M. Woillez, R. Millan-Gabet, E. Serabyn, M. Abajian, D. S. Acton, E. Appleby, J. W. Beletic, C. A. Beichman (+72 others)
2013 Publications of the Astronomical Society of the Pacific  
KI used adaptive optics on the two Keck telescopes to correct the individual wavefronts, as well as active fringe tracking in all modes for path-length control, including the implementation of cophasing  ...  Included is a discussion of the operational aspects of the system, as well as of the achieved system performance.  ...  Since the AO system has removed most of the fast seeing, including tip/tilt, KAT addresses primarily seeing and drifts in the beam train: the tuning procedure results in 3-5 Hz closedloop (command) bandwidth  ... 
doi:10.1086/673475 fatcat:s5nvb2hhabgwfpjxlqwa5inupy

Rotor Position Estimation Approaches for Sensorless Control of Permanent Magnet Traction Motor in Electric Vehicles: A Review

Yong Li, Hao Wu, Xing Xu, Xiaodong Sun, Jindong Zhao
2021 World Electric Vehicle Journal  
The sensorless control techniques of permanent magnet motor for rotor initial position, zero-low speed range, medium-high speed range and full speed range are deeply described and compared.  ...  The sensorless control technology is an effective way to solve the above-mentioned problem. Firstly, the sensorless control techniques of permanent magnet motor are classified.  ...  In the high-power AC transmission system, the advantages of the synchronous motor speed control system are self-evident.  ... 
doi:10.3390/wevj12010009 fatcat:gjhxc4w4p5bihcewve5zfak6hu
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