Results 31 to 40 of about 1,574 (222)

Ascent Trajectory Optimization Using Second-Order Birkhoff Pseudospectral Methods

Aerospace
This paper proposes a novel convex optimization framework for two-stage launch vehicle (TSLV) ascent trajectory planning from liftoff to orbit insertion, featuring two groundbreaking advancements over existing convex optimization methodologies: (1) an ...
Xiaopeng Xue, Yujia Xie, Hui Zhou, Qinghai Gong, Dangjun Zhao   +4 more
doaj   +1 more source

Terminal Velocity Maximization of Air-to-Air Missiles in Agile Turn Phase

MATEC Web of Conferences, 2016
Terminal velocity maximization of air-to-air agile missiles during agile turn phase is studied. It is important to make sure that agile missiles have enough velocity after agile turn stage in order to impact the target.
Kim Min Ki, Tahk Min-Jea, Park Bong-Gyun, Kim Yun-Young   +3 more
doaj   +1 more source

A tutorial on pseudospectral methods for computational optimal control

, 2010
[English] This paper is a tutorial introduction to pseudospectral optimal control. With pseudospectral methods, a function is approximated as a linear combination of smooth basis functions, which are often chosen to be Legendre or Chebyshev polynomials.
Becerra, Victor M., Becerra, Victor, Becerra,Victor M., Victor M. Becerra, Roberto Kawakami Harrop Galvão, Galvão, Roberto Kawakami Harrop, Galvão,Roberto Kawakami Harrop   +6 more
core   +1 more source

Solving a class of Hamilton-Jacobi-Bellman equations using pseudospectral methods [PDF]

, 2018
summary:This paper presents a numerical approach to solve the Hamilton-Jacobi-Bellman (HJB) problem which appears in feedback solution of the optimal control problems.
Shamsi, Mostafa, Mehrali-Varjani, Mohsen, Malek, Alaeddin   +2 more
core   +1 more source

A Neural Operator Emulator for Coastal and Riverine Shallow Water Dynamics

Journal of Geophysical Research: Machine Learning and Computation, Volume 3, Issue 3, June 2026.
Abstract Coastal regions and river floodplains are particularly vulnerable to the impacts of extreme weather events. Accurate real‐time forecasting of hydrodynamic processes in these areas is essential for infrastructure planning and climate adaptation.
Peter Rivera‐Casillas, Sourav Dutta, Shukai Cai, Mark Loveland, Kamaljyoti Nath, Khemraj Shukla, Corey Trahan, Jonghyun Lee, Matthew Farthing, Clint Dawson   +9 more
wiley   +1 more source

Pseudospectral methods versus FDTD [PDF]

IEEE Antennas and Propagation Society International Symposium. Transmitting Waves of Progress to the Next Millennium. 2000 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (Cat. No.00CH37118), 2002
In this paper pseudospectral methods are applied to the solution of electromagnetic problems. Specifically, the Chebyshev collocation method is used along with a mapping of the grid to relax the restrictions on the time-step. Entire-domain as well as multi-domain approaches are considered.
S.V. Georgakopoulos, C.A. Balanis, R. Renaut   +2 more
openaire   +1 more source

Vegetated Canopy Heterogeneity Footprints in the Roughness Sublayer

Journal of Geophysical Research: Atmospheres, Volume 131, Issue 10, 28 May 2026.
Abstract Turbulent flows over horizontally homogeneous rough surfaces are categorized as rough‐wall boundary layer flows, while flows over homogeneous vegetated canopies are better described through a mixing‐layer analogy. At present, numerous studies have investigated canopy density as a transition mechanism between rough‐wall and mixing‐layer‐type ...
Giulia Salmaso, Raúl B. Cal, Marc Calaf
wiley   +1 more source

Autonomous Parking Path Planning Method Based on Pseudospectral Method [PDF]

Jisuanji gongcheng, 2017
Current related researches on parking methods are suitable for parallel parking scenario and vertical parking scenario.So,a general autonomous parking path planning scheme is proposed.The scheme takes the parking time as performance index,and formulates ...
YE Linquan,ZHU Hui,MEI Tao
doaj   +1 more source

Ground‐Motion Characterization for the 2025 U.S. National Seismic Hazard Model for Puerto Rico and the U.S. Virgin Islands

Earthquake Spectra, Volume 42, Issue 2, May 2026.
We develop the ground‐motion characterization (GMC) for the 2025 U.S. National Seismic Hazard Model for Puerto Rico and the U.S. Virgin Islands (NSHM‐PRVI) for earthquakes in active crustal, subduction interface, and subduction intraslab regimes. Using ground‐motion models (GMMs) from the Next‐Generation Attenuation (NGA)‐West2 and NGA‐Subduction ...
Morgan P. Moschetti, Brad T. Aagaard, Kyle B. Withers, Kevin Milner, Jason Altekruse, Julie Herrick, Peter M. Powers, Sanaz Rezaeian, Allison M. Shumway, William Stephenson   +9 more
wiley   +1 more source

Design of an Online Nonlinear Optimal Tracking Control Method for Unmanned Ground Systems

IEEE Access, 2018
A nonlinear tracking error model for unmanned ground systems (UGS) was developed, and the constraints and objective function were established; the tracking control problem for UGS was converted to a continuous nonlinear optimal control problem.
Jie Liu, Wei Han, Yong Zhang, Zhigang Chen, Haijun Peng   +4 more
doaj   +1 more source