scholarly journals A Novel Application of Minimax LQG Control Technique for High-speed Spiral Imaging

2017 ◽  
Vol 20 (4) ◽  
pp. 1400-1412 ◽  
Author(s):  
H. Habibullah ◽  
H. R. Pota ◽  
I. R. Petersen
Keyword(s):  
High Speed ◽  
Control Technique ◽  
Spiral Imaging ◽  
Lqg Control

scholarly journals Portfolio Optimization with Asset-Liability Ratio Regulation Constraints

Complexity ◽  
2020 ◽  
Vol 2020 ◽  
pp. 1-13
Author(s):  
De-Lei Sheng ◽  
Peilong Shen
Keyword(s):  
High Speed ◽  
Asset Price ◽  
Investment Strategy ◽  
Minimum Variance ◽  
Control Technique ◽  
Duality Method ◽  
Lagrange Duality ◽  
Short Period ◽  
High Investment ◽  
Hamilton Jacobi Bellman

This paper considers both a top regulation bound and a bottom regulation bound imposed on the asset-liability ratio at the regulatory time T to reduce risks of abnormal high-speed growth of asset price within a short period of time (or high investment leverage), and to mitigate risks of low assets’ return (or a sharp fall). Applying the stochastic optimal control technique, a Hamilton–Jacobi–Bellman (HJB) equation is derived. Then, the effective investment strategy and the minimum variance are obtained explicitly by using the Lagrange duality method. Moreover, some numerical examples are provided to verify the effectiveness of our results.

Development of Ferroelectric Data Storage Test System for High-Density and High-speed Read/Write

2009 ◽  
Vol 1199 ◽  
Author(s):  
Yoshiomi Hiranaga ◽  
Kenkou Tanaka ◽  
Tomoya Uda ◽  
Yuichi Kurihashi ◽  
Yasuhiro Kimoto ◽  
...  
Keyword(s):  
Thin Film ◽  
Data Storage ◽  
High Speed ◽  
Test System ◽  
Control Technique ◽  
Recording Media ◽  
Bit Rate ◽  
Recording Medium ◽  
Storage Test ◽  
Nonlinear Dielectric

AbstractIn this study, we have developed ferroelectric data storage test systems based on scanning nonlinear dielectric microscopy (SNDM) to conduct various experiments concerning read/write capability. Nanodomain formation on ferroelectric recording media was studied using the data storage test system. A nanodomain dot array was successfully written on a single-crystal LiTaO3 recording medium. The diameter of the written dot was as small as 7 nm. Epitaxial-thin-film LiTaO3 recording media were also developed. Nanodomain dots with the diameter of 25 nm were written on the thin-film recording medium. In addition, a non-contact probe-height control technique was adopted to solve the problem of tip abrasion using higher-order nonlinear dielectric response detection method. Finally, a hard-disk-drive (HDD)-type ferroelectric data storage test system was developed for conducting read/write tests under conditions close to those of actual operation. Capabilities of reading at the bit rate of 2 Mbps and writing at the bit rate of 20 Mbps were confirmed using the HDD-type data storage test system.

Performance Analysis of Adaptive Control Technique for Aircraft Gas Turbine Engine

2017 ◽  
Vol 9 (4) ◽  
Author(s):  
S. Ganesan ◽  
R. Jaganraj ◽  
G.M. Priyadharshini
Keyword(s):  
Adaptive Control ◽  
High Speed ◽  
Aircraft Engine ◽  
Control Technique ◽  
Atmospheric Conditions ◽  
Turbine Engine ◽  
Time Operation ◽  
Real Time Operation ◽  
Speed Mode ◽  
Discharge Pressure

This paper presents an adaptive control technique to compensate the thrust variation in an aircraft engine whose performance has been disturbed due to atmospheric conditions. The course of dysfunction appears when a large throttle transient is performed such that the engine switched from low to high speed mode. A relationship is observed between engine disturbance and the overshoot in engine shaft rpm or compressor discharge pressure or turbine temperature, which is determined to cause the thrust variation. This relationship is used to adapt a control. This method works very well up to the operability limit of an engine. Additionally, the type of disturbance identified from sensors data will be useful to implement the adaptive control in real time operation.

New speckle control technique using high-speed electro-optic modulators with resonant electrode and polarization-reversed structures

2012 ◽  
Vol 19 (6) ◽  
pp. 436-439 ◽  
Author(s):  
Hiroshi Murata ◽  
Keita Furusho ◽  
Kazuhisa Yamamoto ◽  
Yasuyuki Okamura
Keyword(s):  
High Speed ◽  
Control Technique ◽  
Electro Optic

A 12-bit compact column-parallel SAR ADC with dynamic power control technique for high-speed CMOS image sensors

2014 ◽  
Vol 35 (10) ◽  
pp. 105008
Author(s):  
Quanliang Li ◽  
Liyuan Liu ◽  
Ye Han ◽  
Zhongxiang Cao ◽  
Nanjian Wu
Keyword(s):  
Power Control ◽  
High Speed ◽  
Image Sensors ◽  
Sar Adc ◽  
Control Technique ◽  
Dynamic Power ◽  
Cmos Image Sensors

scholarly journals Digital Adaptive Hysteresis Current Control for Multi-Functional Inverters

Energies ◽  
2018 ◽  
Vol 11 (9) ◽  
pp. 2422 ◽  
Author(s):  
Triet Nguyen-Van ◽  
Rikiya Abe ◽  
Kenji Tanaka
Keyword(s):  
High Speed ◽  
Power Flow ◽  
Pulse Width Modulation ◽  
Control Method ◽  
Control Device ◽  
Current Control ◽  
Control Mode ◽  
Control Technique ◽  
Sampled Data ◽  
Hysteresis Current Control

This paper proposes a digital adaptive hysteresis current control method for multi-functional inverters in a power-flow control device called digital grid router. Each inverter can be controlled in master, grid-connected, or stand-alone modes, which can be specified by the controller. While the popular linear sine-triangle pulse width modulation (SPWM) control technique requires complicated proportional-integral (PI) regulators with an unavoidable time delay, hysteresis current control has a simple structure, fast responses, and robustness due to its independent system of parameters. Since the hysteresis current control method controls the output current stay around the reference current directly, in the multi-functional inverter, the reference output is not given by a current directly. Thus, the reference current used to implement the hysteresis current control in this study is calculated from the given reference voltage or power in each control mode. The controller uses high-speed sampled data at MHz level and is implemented by using a field-programmable gate array (FPGA). Experimental results show good performances of the proposed controller in controlling power exchanges in the digital grid router.

scholarly journals Modeling and adaptive robust wavelet control for a liquid container system under slosh and uncertainty

2020 ◽  
pp. 002029402095248
Author(s):  
Mohammad Abdulrahman Al-Mashhadani
Keyword(s):  
Robust Control ◽  
Feedback Linearization ◽  
High Speed ◽  
Adaptive Robust Control ◽  
Control Technique ◽  
Ground Vehicles ◽  
New Approach ◽  
Liquid Slosh ◽  
Attenuation Level ◽  
Highly Nonlinear

Liquid sloshing in moving or stationary containers and flexible uncertainty caused by the slosh are considered to be the most probable causing unexpected coupling effects on the dynamics of many systems such as aerospace, ground vehicles, and high speed industries arms. The coupling of dynamic liquid slosh in a container system with the uncertainty caused by the sensors or dampers is rare documented and this coupling can be considered as a highly nonlinear system. In this paper, an investigation is presented to demonstrate a new approach for enabling the reduction of the liquid slosh and uncertainty by implementing adaptive robust wavelet control technique. Starting by creating the mathematical dynamic model for the nonlinear slosh coupled by uncertainty, adaptive robust control based wavelet transform is applied for calculating optimal motion that minimize residual slosh and uncertainty. Subsequently the adaptive robust control based wavelet network approximation and the appropriate parameter algorithms for the container system with slosh and uncertainty are derived to achieve the feedback linearization, adaptive control, and H∞ tracking performance. The simulation results show that the effects of slosh errors and external uncertainty can be successfully attenuated within a desired attenuation level.

Sign in / Sign up

Export Citation Format

Share Document