H∞/H2 Control

2013 ◽  
pp. 279-314
Keyword(s):  
H2 Control

scholarly journals Strain Sensing With Piezoelectric Zinc Oxide Thin Films for Vibration Suppression in Hard Disk Drives

2008 ◽  
Author(s):  
Sarah Felix ◽  
Stanley Kon ◽  
Jianbin Nie ◽  
Roberto Horowitz
Keyword(s):  
Vibration Suppression ◽  
Transfer Functions ◽  
Hard Disk Drives ◽  
Hard Disk ◽  
Disk Drive ◽  
Strain Sensing ◽  
Linear Quadratic ◽  
H2 Control ◽  
Hard Drives ◽  
Optimization Methodology

This paper describes the integration of thin film ZnO strain sensors onto hard disk drive suspensions for improved vibration suppression for tracking control. Sensor location was designed using an efficient optimization methodology based on linear quadratic gaussian (LQG) control. Sensors were fabricated directly onto steel wafers that were subsequently made into instrumented suspensions. Prototype instrumented suspensions were installed into commercial hard drives and tested. For the first time, a sensing signal was successfully obtained while the suspension was flying on a disk as in normal drive operation. Preliminary models were identified from experimental transfer functions. Nominal H2 control simulations demonstrated improved vibration suppression as a result of both the better resolution and higher sensing rate provided by the sensors.

pH-dependent speciation and hydrogen (H2) control U(VI) respiration byDesulfovibrio vulgaris

2018 ◽  
Vol 115 (6) ◽  
pp. 1465-1474 ◽  
Author(s):  
Shilpi Kushwaha ◽  
Andrew K. Marcus ◽  
Bruce E. Rittmann
Keyword(s):  
H2 Control ◽  
Ph Dependent

LMI Based Robust H2 Control of a Ball Balancing Robot with Omni-wheels

2019 ◽  
Author(s):  
Flavio H. B. Lima ◽  
Eduardo Poleze ◽  
Gabriel P. das Neves ◽  
Bruno A. Angelico
Keyword(s):  
H2 Control ◽  
Balancing Robot

Optimal Vibration Control Strategy for Offshore Platforms Accounting for AMD Constraints

2004 ◽  
Author(s):  
Chunyan Ji ◽  
Qingmin Meng
Keyword(s):  
Control Algorithm ◽  
Feedback Gain ◽  
Offshore Platforms ◽  
Control Force ◽  
Wave Loading ◽  
Offshore Structure ◽  
H2 Control ◽  
Input Control ◽  
The Mathematical Model ◽  
H2 Optimization

In order to control the excessive vibration of offshore platforms under wave excitations, an H2 control algorithm was presented in this paper. In the present study, noise terms for generating filtered wave loading and accounting for model uncertainty are separated. In addition, in H2 optimization problem, AMD’s capacities are considered by setting the limits of AMD stroke and maximum input control force. And the formulations of such algorithm are described. In order to investigate the feasibility and effectiveness of the proposed method, a numerical example applied to an offshore platform is presented in this paper. The numerical results demonstrate that the proposed algorithm is effective in reducing the vibration of offshore structure when there are some uncertainties in building the mathematical model of the structure. In addition, AMD designed by the proposed method can keep its operation by choosing appropriate feedback gain among several gain candidates based on the AMD limits.

scholarly journals UPPER BOUND H∞ AND H2 CONTROL FOR SYMMETRIC MECHANICAL SYSTEMS

2005 ◽  
Vol 38 (1) ◽  
pp. 976-981
Author(s):  
Kazuhiko Hiramoto ◽  
Yuanqiang Bai ◽  
Karolos M. Grigoriadis
Keyword(s):  
Upper Bound ◽  
Mechanical Systems ◽  
H2 Control
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