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A Post-Flutter Response Constraint for Gradient-Based Aircraft Design Optimization

A Post-Flutter Response Constraint for Gradient-Based Aircra...

引用

AIAA Aviation Forum and Exposition

作者： Riso, Cristina Cesnik, Carlos E. S. Epureanu, Bogdan, I Teufel, Patrick Univ Michigan Dept Aerosp Engn 1320 Beal Ave Ann Arbor MI 48109 USA Univ Michigan Dept Mech Engn 2350 Hayward St Ann Arbor MI 48109 USA Airbus Operat GmbH Blagnac France

ISBN: (数字)9781624106101

ISBN: (纸本)9781624106101

Considering flutter as a constraint in aircraft design optimization has the potential to enable energy-efficient vehicle designs with high-aspect-ratio wings while meeting flutter requirements early in the design cycle. However, nonlinear aeroelastic effects in high-aspect-ratio wings may cause self-sustained oscillations to arise even before flutter occurs (subcritical bifurcation). To address this problem, this paper presents a novel post-flutter response constraint for gradientbased aircraft design optimization. The constraint prevents self-sustained oscillations inside the flight envelope independent of the flutter boundary. Moreover, it avoids transient or iterative calculations and can handle discontinuities due to mode switches and hump modes. The formulation is demonstrated by optimizing a typical aeroelastic section with a nonlinear torsion spring and an initially subcritical bifurcation. The results show that the post-flutter response constraint suppresses the subcritical bifurcation while keeping the flutter constraint active, so avoiding a conservative solution.

关键词： Aircraft Design High Aspect Ratio Flight Envelope Transient Response Nonlinear Aeroelastic Systems Computing Stiffness Matrices Structural Damping Aerodynamic Shape Optimization sequential quadratic programming

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Steady-Straight-Level Flight Study: A Mathematical Optimization Approach and Flight Test

Steady-Straight-Level Flight Study: A Mathematical Optimizat...

引用

AIAA Aviation Forum

作者： Salahuddeni Ghosh, Ajoy Kanti Indian Inst Technol Kanpur Aerosp Engn Kanpur 208016 Uttar Pradesh India

ISBN: (数字)9781624105982

ISBN: (纸本)9781624105982

In this paper, an experiment based thrust control command expression for propeller-driven-piston-engine powered aircraft is obtained to complete the required dynamics for finding the trim flight solutions in steady-straight-level (SSL) condition using a nonlinear optimization technique. sequential quadratic programming (SQP) is adapted to compute the angle-of-attack, sideslip angle and bank angle for a specified flight velocity, turn-radius, and flight path angle of an aircraft which is further utilized to evaluate the trim states and control inputs in SSL flight. Both aerodynamic and thrust control inputs are calculated by the steady-state solution of equations of motion of aircraft. As per the novelty of the present study concern, the flight test is performed on Hansa-3 aircraft at the airfield of IIT Kanpur to model the thrust input as well as to verify the numerical results. Additionally, through the numerical analysis, it is observed that the SQP method economizes the computation time as compared to a gradient descent approach method.

关键词： Flight Testing Pitch Yaw Stability Mathematical Optimization Elevator Deflection sequential quadratic programming Propellers Aerodynamic Moments Flight Path Angle Angle of Sideslip Lagrange Multipliers

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A ROBUST MINIMUM VOLUME ENCLOSING SIMPLEX ALGORITHM FOR HYPERSPECTRAL UNMIXING

A ROBUST MINIMUM VOLUME ENCLOSING SIMPLEX ALGORITHM FOR HYPE...

引用

2010 IEEE International Conference on Acoustics, Speech, and Signal Processing

作者： Ambikapathi, ArulMurugan Chan, Tsung-Han Ma, Wing-Kin Chi, Chong-Yung Natl Tsing Hua Univ Inst Commun Eng Hsinchu Taiwan

ISBN: (纸本)9781424442966

Hyperspectral unmixing is a process of extracting hidden spectral signatures (or endmembers) and the corresponding proportions (or abundances) of a scene, from its hyperspectral observations. Motivated by Craig's belief, we recently proposed an alternating linear programming based hyperspectral unmixing algorithm called minimum volume enclosing simplex (MVES) algorithm, which can yield good unmixing performance even for instances of highly mixed data. In this paper, we propose a robust MVES algorithm called RMVES algorithm, which involves probabilistic reformulation of the MVES algorithm, so as to account for the presence of noise in the observations. The problem formulation for RMVES algorithm is manifested as a chance constrained program, which can be suitably implemented using sequential quadratic programming (SQP) solvers in an alternating fashion. Monte Carlo simulations are presented to demonstrate the efficacy of the proposed RMVES algorithm over several existing benchmark hyperspectral unmixing methods, including the original MVES algorithm.

关键词： Convex analysis Hyperspectral unmixing Minimum-volume enclosing simplex Chance constrained program sequential quadratic programming

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Reentry Trajectory Optimization of Airbreathing Hypersonic Vehicles Based on Gauss Pseudospectral Method

Reentry Trajectory Optimization of Airbreathing Hypersonic V...

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International Conference on Manufacturing Science and Technology (ICMST 2011)

作者： Yang, Bo Sun, Shang Beijing Univ Aeronaut & Astronaut Sch Astronaut Beijing 100083 Peoples R China

ISBN: (纸本)9783037852958

According to the nonlinear, multivariable and multi-constraint features of the reentry trajectory optimization problem of airbreathing hypersonic vehicles, a suboptimal solution method is developed. The reentry trajectory generation is converted to a nonlinear programming (NLP) problem by using Gauss pseudospectral method (GPM). The state and control variables on Gauss nodes are chosen as parameters to be optimized and the minimum total heat absorption is chosen as the optimal performance index. Then the sequential quadratic programming (SQP) method is used to solve the NLP problem. The states of optimized trajectory are compared with the states obtained by the integral of kinetic equations. By simulating on an example of airbreathing hypersonic vehicles, it is demonstrated that the above method is not sensitive to the estimate of motion states and is easier to converge. And the method is effective to solve trajectory optimization problems.

关键词： Airbreathing Hypersonic Vehicle Trajectory Optimization Gauss Pseudospectral Method sequential quadratic programming Minimum Total Heat Absorption

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Low Frequency Operation of Modular Multilevel Matrix Converter Using Optimization-Oriented Predictive Control Scheme 17

Low Frequency Operation of Modular Multilevel Matrix Convert...

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17th IEEE Workshop on Control and Modeling for Power Electronics (COMPEL)

作者： Nademi, Hamed Norum, Lars Einar Soghomonian, Zareh Undeland, Tore ABB AS Proc Automat Div N-0603 Oslo Norway Norwegian Univ Sci & Technol Dept Elect Power Engn N-7491 Trondheim Norway Huntington Ingalls Ind Inc Newport News VA USA

ISBN: (纸本)9781509018154

In power converters, common challenge for current reference tracking employing model predictive control (MPC) is the high computational burden. This issue is more obvious when solving optimal control problems over prediction horizons. To manage and enhance the computational efficiency of widely used control strategies, an integrated perturbation analysis and sequential quadratic programming (IPA-SQP) solver is used to achieve the system constrained optimization and lower sampling times, hence reducing the computational complexity. A Finite-Control-Set Model Predictive Control (FCS-MPC) for current control in cascaded H-bridge Modular Multilevel Matrix Converter (M3C) is also developed. The M3C is connected to a low frequency AC system, which has an operating frequency less than 20 Hz. The proposed control scheme is therefore introducing an alternative for practical implementation. Simulation results for a closed-loop system with low frequency output side for a 9-level M3C is included to validate the main findings.

关键词： Modular Multilevel Matrix Converter Model Predictive Control sequential quadratic programming Optimization problem

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A Microgrid Application of Polygeneration System Fed by Natural Gas: Effect of Fuel Price on Investment Outlook

A Microgrid Application of Polygeneration System Fed by Natu...

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Asian Conference on Energy, Power and Transportation Electrification (ACEPT)

作者： Ooi, Sean Mazzoni, Stefano Romagnoli, Alessandro Nanyang Technol Univ Energy Res NTU Singapore Singapore Nanyang Technol Univ Sch Mech & Aerosp Engn Singapore Singapore

ISBN: (纸本)9781538681367

Natural Gas (NG), which represents 95% of the fuel mix in stationary power generation in Singapore, has been seen as the replacement of traditional pollutant-heavy fuels such as diesel. In the microgrid context, NG is a crucial raw material for powering principal components such as the Reciprocating Engine (RE), which provides the base load when the microgrid is in islanded mode. In this study, the effect of NC prices on the financial viability of operating a microgrid which integrates Combined Heat and Power, solar PV, electrochemical storage, vapour chiller and the main grid has been investigated. The economic dispatch of the components indicate that at an increase of NG price by 20 cents reduces the operating hours per day of the RE by nearly half, with the option of purchasing from the grid preferred instead. Furthermore, at a higher fuel price the battery is required to operate at a heavier duty cycle, thus reducing its lifetime. A positive Net Present Value (NPV) in the order of millions of SGD is obtained in the NG price range of SGD0.4-0.6 per kg after 20 years, whilst at a price of SGD0.8 per kg, the microgrid fails to provide a positive NPV. The option of regasitication of LNG prior to feeding it into the RE has been found to provide a maximum amount of cold energy in the region of 500kWh per day.

关键词： microgrids polygeneration optimal dispatch sequential quadratic programming Internal Combustion Engine

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Component-Oriented Decomposition for Collaborative Optimization in Reinforcement Concrete Bridge Design

Component-Oriented Decomposition for Collaborative Optimizat...

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4th International Conference on Technology of Architecture and Structure (ICTAS 2011)

作者： Wang, Lian Fa Tang, Ai Ping Harbin Inst Technol Sch Civil Engn Harbin 150090 Peoples R China

ISBN: (纸本)9783037852798

In order to implement the bi-level optimization strategy-collaborative optimization (CO) to bridge design, bridge optimization design process is subdivided into three subsystems in terms of component-oriented decomposition: superstructure subsystem, bearing subsystem and substructure subsystem. For system level, target function is formulated with the total direct construction cost, and inequality constraints induced relaxation factors are adopted to relax the intersubsystem consistency constraints. For subsystems, target functions are formulated with discrepancy expressions and constraints are formulated according to corresponding codes demands respectively. The feasibility and validity of the proposed approach are examined with an optimization process of reinforcement concrete box girder bridge. Optimization results from proposed approach are compared with that from mono-discipline optimization. The proposed approach shows high computing efficiency than mono-discipline optimization methods when achieving same optimization results.

关键词： Collaborative Optimization Component-oriented decomposition Reinforcement concrete box girder bridge sequential quadratic programming Genetic Algorithm

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Low Complexity High Throughput Algorithms for MIMO AF Relay Networks

Low Complexity High Throughput Algorithms for MIMO AF Relay ...

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IEEE International Conference on Communications (ICC)

作者： Sun, Cong Jorswieck, Eduard Chinese Acad Sci State Key Lab Sci & Engn Comp ICMSEC Acad Math & Syst Sci Beijing Peoples R China Tech Univ Dresden Commun Lab Commun Theory Dresden Germany

ISBN: (纸本)9781467331227

A multiple-antenna amplify-and-forward (AF) two-hop interference network with multiple links and multiple relays is considered. We optimize transmit precoders, receive decoders and relay AF matrices to maximize the achievable sum rate. Two constraint sets are discussed: first, individual per user and total relay sum power constraints. We propose an algorithm to maximize the total signal to total interference plus noise ratio (TSTINR). Second, this algorithm is extended to individual user and individual relay fixed transmit power constraints. Additionally, we derive algorithms for the total leakage interference plus noise (TLIN) minimization and the weighted minimum mean square error (WMMSE) approach to sum rate maximization. Interestingly, our simulations show that, for both constraint sets, our TSTINR algorithm outperforms the TLIN algorithm generally and outperforms WMMSE in medium to high Signal-to-Noise-Ratio (SNR) scenarios, while TSTINR and TLIN requires less computing time than WMMSE generally.

关键词： MIMO relay networks individual power constraints alternating iteration sequential quadratic programming

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Some results on the design of brushless DC wheel motor using SQP and GA

Some results on the design of brushless DC wheel motor using...

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9th International Workshop on Optimization and Inverse Problems in Electromagnetism

作者： Moussouni, F. Brisset, S. Brochet, P. Ecole Cent Lille L2EP F-59651 Villeneuve Dascq France

The sequential quadratic programming and genetic algorithms are finely tuned on the optimal design of a brushless DC wheel motor. Combining both methods, a hybrid approach is tested. Multiobjective optimizations are performed using Nondominated Sorting Genetic Algorithm, Strength Pareto Evolutionary Algorithm, and a variable weighted sum of objectives with the sequential quadratic programming. The Pareto fronts are compared in term of accuracy, uniformity, and coverage criteria using some quality indicators.

关键词： sequential quadratic programming genetic algorithms mixed-integer optimization multiobjective optimization

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Non-Linear Multiobjective Optimization for Control of Hydropower Plants Network

Non-Linear Multiobjective Optimization for Control of Hydrop...

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IEEE/ASME International Conference on Advanced Intelligent Mechatronics

作者： Moosavian, S. Ali A. Ghafari, A. Salimi, A. Abdi, N. KN Toosi Univ Technol Dept Mech Engn ARAS Lab Tehran Iran

ISBN: (纸本)9781424424948

In this paper, a non-linear multiobjective optimization model is developed to obtain optimal annual scheduling for control of power generation in serial or parallel hydropower plants. Weighted-sum method is used to convert multiobjective optimization to single objective problem. Then, sequential quadratic programming (SQP) is used, based on using Newton's method and Kune-Tucker conditions, to solve optimization problem. Maximization of power generation benefits and minimization of specific water consumption are assumed as objective functions. In this study, stochastic flows from external sources that enter to each reservoir (like rivers and rain) are assumed based on some scenarios for dry, median, and wet years. These various dry, median and wet water inflow scenarios are generated from the gathered fifty-year historical inflow measurements. Besides, turbine power generation is obtained from hill diagrams. The case study refers to hydropower plants network in Karoon River Basin in southern Iran. The corresponding optimization model has 240 variables and 660 constraints and MATLAB software is used to develop the model. Solving such non-linear multiobjective optimization model, annual rule curves that show optimal operation for reservoirs and total yearly energy production are presented for control of the cascaded units.

关键词： Network of hydropower plant Optimal annual scheduling Multiobjective optimization Weighted sum method sequential quadratic programming

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