Impact of Including Electronics Design on Design of Intelligent Structures: Applications to Multifunctional Structures for Attitude Control (MSAC)

ASME 2020 Conference on Smart Materials, Adaptive Structures and Intelligent Systems ◽

10.1115/smasis2020-2331 ◽

2020 ◽

Author(s):

Vedant ◽

James T. Allison

Keyword(s):

Control System ◽

Power Electronics ◽

Attitude Control ◽

Dynamic Models ◽

High Fidelity ◽

Element Analysis ◽

Design Studies ◽

Intelligent Structures ◽

The Impact ◽

Electronics Design

Abstract Multifunctional Structures for Attitude Control (MSAC) is a new spacecraft attitude control system that utilizes deployable panels as multifunctional intelligent structures to provide both fine pointing and large slew attitude control. Previous studies introduced MSAC design and operation concepts, simulation-based design studies, and Hardware-in-the-Loop (HIL) validation of a simplified prototype. In this article, we expand the scope of design studies to include individual compliant piezo-electric actuators and associated power electronics. This advance is a step toward high-fidelity MSAC system operation, and reveals new design insights for further performance enhancement. Actuators are designed using pseudo rigid body dynamic models (PRBDMs), and are validated for steady-state and step responses against Finite Element Analysis. The drive electronics model consists of a few distinct topologies that will be used to evaluate system performance for given mechanical and control system designs. Subsequently, a high-fidelity multiphysics multibody MSAC system model, based on the validated compliant actuators and drive electronics, is developed to support implementation of MSAC Control Co-design optimization studies. This model will be used to demonstrate the impact of including the power electronics design in the Optimal Control Co-Design domain. The different control trajectories are compared for slew rates and the vibrational jitter introduced to the satellite. The results from this work will be used to realize closed-loop control trajectories that have minimal jitter introduction while providing high slew rates.

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Adaptive Control for Steering Engine Fault of Ducted Fan UAV

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.602-605.834 ◽

2014 ◽

Vol 602-605 ◽

pp. 834-843

Author(s):

An Huang ◽

Zhong Xi Hou

Keyword(s):

Control System ◽

Attitude Control ◽

Adaptive Controller ◽

Attitude Control System ◽

Model Reference ◽

Ducted Fan ◽

Model Reference Adaptive ◽

The Impact ◽

The Relationship ◽

Good Attitude

For the steering engine fault of ducted fan UAV that may arise during the hovering, designing adaptive controller for attitude control. First, concentrating on modeling of the hovering state of ducted fan UAV, and getting the relationship between steering engine and attitude control. Then analyzing the impact of steering engine fault on the attitude control system basing on the control model. Finally, designing model reference adaptive controller basing on the fault model, so that the ducted fan UAV can maintain good attitude control if steering engine fault occurs during the hovering. Simulation results show that when steering engine fault occurs, the model reference adaptive controller can effectively inhibit the adverse effects brought by steering engine fault, so the attitude control system has strong adaptability and robustness.

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Comparing Filtering Multifidelity Optimization Strategies With a Simulation-Based Multidisciplinary Aircraft Model

Journal of Mechanical Design ◽

10.1115/1.4049657 ◽

2021 ◽

Vol 143 (8) ◽

Author(s):

Brian Chell ◽

Steven Hoffenson ◽

Cory J. G. Philippe ◽

Mark R. Blackburn

Keyword(s):

Multidisciplinary Optimization ◽

High Fidelity ◽

Element Analysis ◽

Solution Quality ◽

Local Algorithms ◽

Starting Point ◽

Aircraft System ◽

Dynamics Simulations ◽

The Impact ◽

Multifidelity Optimization

Abstract Multifidelity optimization leverages the fast run times of low-fidelity models with the accuracy of high-fidelity models (HFMs), in order to conserve computing resources while still reaching optimal solutions. This work focuses on the multifidelity multidisciplinary optimization of an aircraft system model with finite element analysis and computational fluid dynamics simulations in the loop. A two-step filtering method is used where a lower fidelity model is optimized, and then the solution is used as a starting point for a higher-fidelity optimization routine. By starting the high-fidelity routine at a nearly optimal region of the design space, the computing resources required for optimization are expected to decrease when using local algorithms. Results show that, when using surrogates for the lower fidelity models, the multifidelity workflows save statistically significant amounts of time over optimizing the original HFM alone. However, the impact on solution quality varies depending on the model behavior and optimization algorithm.

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High Accuracy Attitude Control System Design for Satellite with Flexible Appendages

Mathematical Problems in Engineering ◽

10.1155/2014/695758 ◽

2014 ◽

Vol 2014 ◽

pp. 1-6 ◽

Cited By ~ 1

Author(s):

Wenya Zhou ◽

Haixu Wang ◽

Zhengwei Ruan ◽

Zhigang Wu ◽

Enmei Wang

Keyword(s):

Control System ◽

Attitude Control ◽

Design Method ◽

Notch Filter ◽

Vibration Signal ◽

High Accuracy ◽

Frequency Variation ◽

Attitude Control System ◽

The Impact ◽

Flexible Appendages

In order to realize the high accuracy attitude control of satellite with flexible appendages, attitude control system consisting of the controller and structural filter was designed. When the low order vibration frequency of flexible appendages is approximating the bandwidth of attitude control system, the vibration signal will enter the control system through measurement device to bring impact on the accuracy or even the stability. In order to reduce the impact of vibration of appendages on the attitude control system, the structural filter is designed in terms of rejecting the vibration of flexible appendages. Considering the potential problem of in-orbit frequency variation of the flexible appendages, the design method for the adaptive notch filter is proposed based on the in-orbit identification technology. Finally, the simulation results are given to demonstrate the feasibility and effectiveness of the proposed design techniques.

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Monetary policy and the effect of the transfer of oil prices to inflation

Voprosy Ekonomiki ◽

10.32609/0042-8736-2020-8-41-50 ◽

2020 ◽

pp. 41-50

Author(s):

Ph. S. Kartaev ◽

I. D. Medvedev

Keyword(s):

Monetary Policy ◽

Inflation Targeting ◽

Dynamic Models ◽

Oil Prices ◽

Oil Price ◽

Oil Price Shocks ◽

Negative Effects ◽

Price Shocks ◽

Policy Regime ◽

The Impact

The paper examines the impact of oil price shocks on inflation, as well as the impact of the choice of the monetary policy regime on the strength of this influence. We used dynamic models on panel data for the countries of the world for the period from 2000 to 2017. It is shown that mainly the impact of changes in oil prices on inflation is carried out through the channel of exchange rate. The paper demonstrates the influence of the transition to inflation targeting on the nature of the relationship between oil price shocks and inflation. This effect is asymmetrical: during periods of rising oil prices, inflation targeting reduces the effect of the transfer of oil prices, limiting negative effects of shock. During periods of decline in oil prices, this monetary policy regime, in contrast, contributes to a stronger transfer, helping to reduce inflation.

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