Dr. Kougen Ma Profile

Dr. Kougen Ma

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Publications (10)

Proceedings Article | 10 April 2010 Paper

Simultaneous thrust vector control and vibration isolation of satellites using steerable smart platforms

Mehrdad Ghasemi-Nejhad, Kougen Ma

Proceedings Volume 7643, 76431M (2010) https://doi.org/10.1117/12.847821

KEYWORDS: Satellites, Actuators, Vibration control, Vibration isolation, Control systems, Composites, Sensors, Feedback loops, Amplifiers, Kinematics

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Proceedings Article | 7 April 2009 Paper

Vibration suppression of satellites using multifunctional platforms

Nicolas Antin, Richard Russ, Kougen Ma, Mehrdad Ghasemi-Nejhad

Proceedings Volume 7288, 72882C (2009) https://doi.org/10.1117/12.815867

KEYWORDS: Satellites, Composites, Finite element methods, Actuators, Smart structures, Data modeling, Structural design, Sensors, Control systems, Active vibration control

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Proceedings Article | 18 April 2008 Paper

Integration, control, and applications of multifunctional linear actuators

Kougen Ma, Mehrdad Ghasemi-Nejhad

Proceedings Volume 6928, 69281R (2008) https://doi.org/10.1117/12.775960

KEYWORDS: Actuators, Fuzzy logic, Composites, Satellites, Sensors, Computer programming, Motion measurement, Adaptive control, Smart materials, Nonlinear control

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Proceedings Article | 18 April 2008 Paper

Robust vibration suppression of an adaptive circular composite plate for satellite thrust vector control

Su Yan, Kougen Ma, Mehrdad Ghasemi-Nejhad

Proceedings Volume 6928, 69281S (2008) https://doi.org/10.1117/12.775966

KEYWORDS: Satellites, Composites, Sensors, Control systems, Linear filtering, Feedback control, Adaptive control, Actuators, Control systems design, Protactinium

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Proceedings Article | 5 April 2006 Paper

Thrust vector control of satellites using smart parallel manipulators

Kougen Ma, Mehrdad Ghasemi-Nejhad

Proceedings Volume 6173, 61730R (2006) https://doi.org/10.1117/12.658067

KEYWORDS: Satellites, Fuzzy logic, Control systems, Composites, Kinematics, Device simulation, Picosecond phenomena, Actuators, Tolerancing, Space operations

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Proceedings Article | 27 March 2006 Paper

A finite element analysis approach with integrated PID control for simultaneous precision positioning and vibration suppression of smart structures

Richard Russ, Kougen Ma, Mehrdad Ghasemi-Nejhad

Proceedings Volume 6166, 616617 (2006) https://doi.org/10.1117/12.658056

KEYWORDS: Actuators, Smart structures, Finite element methods, Composites, Sensors, Device simulation, Error analysis, Silicon, Modal analysis, Integrated modeling

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This paper focuses on the development of an ANSYS finite element analysis (FEA) environment with integrated PID control scheme for simultaneous precision positioning and vibration suppression of smart composite structures with piezoelectric flat patches acting as actuators. This environment includes three modules: structural modeling, PID controller design, and dynamic analysis of smart structures. Two types of PID controllers are investigated, namely, PID vibration suppression (PID-VS) controller and PID simultaneous precision positioning and vibration suppression (PIDSPPVS) controller. The PID-VS controller is suitable to perform only vibration suppression with no positioning capability. The PID-SPPVS controller is equipped with SPPVS capabilities. The characteristics of individual control gains and their behavior with respect to each other for the two PID controllers are also studied. The gain selection for the PID-VS controller is based on obtaining the best VS while the gain selection for the PID-SPPVS controller is based on achieving the best positioning accuracy and VS simultaneously. In this study, a horizontal cantilevered graphite/epoxy composite beam with one surface-mounted ACX piezoelectric flat patch located at the beam root is first modeled. Next, the FE modal analysis is performed to determine the natural frequencies and hence the time step interval needed for the FE transient analysis. During the transient analysis, the mid-point of the beam tip is subjected to different types of external excitations such as sine loadings with different frequencies as well as random forces to evaluate the two PID controller performances. It is demonstrated that the FEA model with integrated PID-SPPVS controller is able to reach the desired position in a much shorter time in comparison to the PID-VS controller. Vibration amplitude reduction capabilities for the both PID controllers are very similar, although the PID-VS controller performs slightly better. This study also implies that the integrated FEA environment, consisting of the structural modeling of active composite structures with piezoelectric flat patches, modal and transient analyses, controller design, and simulation, provides a powerful tool for the design, analysis, and control of smart structures with SPPVS capabilities.

Proceedings Article | 19 May 2005 Paper

MIMO adaptive control of thruster-firing-induced vibration of satellites using multifunctional platforms

Kougen Ma, Mehrdad Ghasemi-Nejhad

Proceedings Volume 5757, (2005) https://doi.org/10.1117/12.598495

KEYWORDS: Satellites, Actuators, Adaptive control, Composites, Control systems, Vibration control, Sensors, Digital filtering, Smart structures, Tolerancing

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Proceedings Article | 26 July 2004 Paper

Two-DOF precision platform for spacecraft thrust vector control: control strategies and simulations

Kougen Ma, Mehrdad Ghasemi-Nejhad

Proceedings Volume 5390, (2004) https://doi.org/10.1117/12.539392

KEYWORDS: Fuzzy logic, Control systems, Sensors, Satellites, Active vibration control, Kinematics, Space operations, Motion controllers, Composites, Actuators

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Proceedings Article | 1 August 2003 Paper

Adaptive internal model control for simultaneous precision positioning and vibration suppression of smart structures

Kougen Ma, Mehrdad Ghasemi-Nejhad

Proceedings Volume 5049, (2003) https://doi.org/10.1117/12.482731

KEYWORDS: Adaptive control, Ferroelectric materials, Sensors, Current controlled current source, Composites, Smart structures, Signal processing, Digital filtering, Feedback control, Ceramics

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Proceedings Article | 10 July 2002 Paper

Hybrid adaptive control of intelligent structures with simultaneous precision positioning and vibration suppression

Kougen Ma, Saeid Pourjalali, Mehrdad Ghasemi-Nejhad

Proceedings Volume 4693, (2002) https://doi.org/10.1117/12.475213

KEYWORDS: Adaptive control, Composites, Feedback control, Signal processing, Digital filtering, Fiber optics sensors, Ferroelectric materials, Sensors, Current controlled current source, Device simulation

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Showing 5 of 10 publications

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