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THE KNOWLEDGE TEST FOR EVALUATION OF THE ACHIEVEMENT IN THE SUBJECT OF computing and informatics

METALURGIA INTERNATIONAL 2012年第7期17卷 170-175页

作者： Papic, Zeljko M. Papic, Milos Stankovic, Nebojsa Tech Fac Cacak Serbia

The paper presents the evaluation of knowledge of the subject of computing and informatics of the first year students of Gymnasium high school. The knowledge test was particularly designed for this purpose. The main objective of the research is to determine the level of acquired knowledge of computing and informatics. The research evaluated 362 first grade Gymnasium students from three cities in Serbia: Cacak, Kraljevo and Uzice. As the result of this study, and due to the constant changes in Information Technology (IT), the authors suggest a complete reconstruction of the IT curriculum for the first year of Gymnasium, and an update of the existing curriculum every two to three years.

关键词： computing and informatics IT training knowledge test research

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Dynamic Condensation for Efficient Band-Structure Calculations of 2D Periodic Structures

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AIAA JOURNAL 2025年第2期63卷 439-452页

作者： Hagos, Robel Weldebrhan Han, Jae-Hung Korea Adv Inst Sci & Technol Smart Struct & Hardware Syst Lab Dept Aerosp Engn Daejeon 34141 South Korea

Efficient band-structure calculations are essential for understanding the mechanical behaviors of periodic materials, with significant implications in material design and phononic engineering. This paper introduces the application of the improved reduced system (IRS) technique to expedite elastic band-structure calculations. The IRS, a dynamic condensation method, partitions the unit cell degrees of freedom (DOFs) into primary and secondary sets. A strategic selection of primary DOFs retains a subset of interior DOFs alongside all exterior DOFs while truncating the remaining interior DOFs. The integration of IRS with the Craig-Bampton method for additional reduction and the imposition of Bloch boundary conditions yields a notable decrease in computational overhead. Additionally, for structures with a high number of interior DOFs, a substructuring scheme can be implemented to further enhance efficiency. This approach offers a compelling combination of accuracy and expedited computation, making it applicable across diverse periodic materials.

关键词： Finite Element Method Structural Dynamics and Characterization Quasiparticles Metamaterials Wavenumber computing and informatics Phononic Engineering Dynamic Condensation Band Structure Periodic Structure

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Utility-Driven Approach to Onboard Scheduling and Execution for an Autonomous Europa Lander Mission

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JOURNAL OF AEROSPACE INFORMATION SYSTEMS 2025年第2期22卷 73-89页

作者： Russino, Joseph A. Wang, Daniel Wagner, Caleb Rabideau, Gregg Mirza, Faiz Basich, Connor Mauceri, Cecilia Twu, Philip Reeves, Glenn Tan-Wang, Grace Chien, Steve CALTECH Jet Prop Lab Artificial Intelligence Grp 4800 Oak Grove Dr Pasadena CA 91109 USA CALTECH Jet Prop Lab Mobil & Robot Syst 4800 Oak Grove Dr Pasadena CA 91109 USA CALTECH Jet Prop Lab Robot Operat & V&V 4800 Oak Grove Dr Pasadena CA 91109 USA CALTECH Jet Prop Lab Syst Engn Grp 4800 Oak Grove Dr Pasadena CA 91109 USA CALTECH Jet Prop Lab 4800 Oak Grove Dr Pasadena CA 91109 USA

Jupiter's icy moon Europa is among the most promising locations to explore for signs of extraterrestrial life in our solar system. However, searching for biosignatures on the surface of Europa presents an unprecedented set of challenges: immense uncertainty, limited energy, and few opportunities for operator feedback. Effectively carrying out a robotic science campaign under these conditions will require a system with a greater degree of autonomy than any planetary exploration mission to date. In particular, onboard scheduling and execution are required for robustness to uncertainty in surface conditions, variation in lander performance, and science discoveries to maximize the quantity and quality of science data returned to Earth during a fixed, limited lander lifetime. Here we represent a proposed Europa Lander surface mission as a utility-driven hierarchical task network and establish through analysis that onboard autonomy using automated mission planning with execution feedback and predictive task models results in mission execution that is more consistently productive compared to traditional static approaches. We design a simulated onboard autonomy framework built by integrating two software components-Multi-mission EXECutive and Europa Lander Autonomy Prototype-to properly simulate the Europa Lander domain and demonstrate empirically that the proposed planning and execution system is capable of commanding a set of realistic surface scenarios as part of a larger Europa Lander surface autonomy software prototype. We expect that an approach to scheduling and execution grounded in decision theory will be an enabling technology for future tightly constrained planetary surface missions.

关键词： Moons of Jupiter Planets Solar System Moons Planetary Science and Exploration Data Products computing and informatics Space Missions Intelligent Payload Experiment Vibration Measuring Instruments Autonomous Systems

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Designing Routes in Terminal Maneuvering Area Using Hybrid Simulated Annealing

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JOURNAL OF GUIDANCE CONTROL AND DYNAMICS 2025年第3期48卷 615-629页

作者： Zhou, Jun Wang, Xujie Hu, Xiaobing Civil Aviat Univ China Sino European Inst Aviat Engn Coll Safety Sci Lab Complex Syst Safety & Intelligent Decis Tianjin 300300 Peoples R China Civil Aviat Univ China Coll Safety Sci & Engn Lab Complex Syst Safety & Intelligent Decis Tianjin 300300 Peoples R China

To ensure the safe and efficient operation of flights in terminal maneuvering areas, airports establish standard arrival and departure procedures. However, designing these procedures is typically time-consuming and challenging for quantitative path length optimization. This paper presents an efficient optimization method for designing multiple arrival and departure procedures, taking into account the configuration of the airport and the nearby environment. The objective is to minimize the total length of routes while satisfying related operational constraints, such as obstacle avoidance and route separation. Each route is modeled in three dimensions, consisting of a horizontal polygonal line and a vertical cone. Considering the actual procedures' merging or diverging configuration characteristics, multiple arrival or departure routes are then modeled as a tree-like topology structure. A hybrid algorithm, integrating simulated annealing and an improved A* algorithm, is developed for automated problem-solving. Simulation results, based on tests at Sweden's Arlanda Airport, exhibit advantages over existing related research in terms of both total route length and computing time. Tests at Shanghai Pudong Airport show an 8% reduction in total path length compared to actual procedures, demonstrating the proposed method's effectiveness and potential contributions to energy savings and emissions reduction.

关键词： Annealing Terminal Manoeuvring Area Obstacle Avoidance computing and informatics Optimization Algorithm Initial Approach Fix Standard Terminal Arrival Route Air Navigation Service Provider Standard Instrument Departure Airspace Management

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Rapid Nonlinear Convex Guidance Using a Monomial Method

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JOURNAL OF GUIDANCE CONTROL AND DYNAMICS 2025年第4期48卷 736-756页

作者： Burnett, Ethan R. Topputo, Francesco Polytech Univ Milan Dept Aerosp Sci & Technol Via La Masa 34 I-20156 Milan Italy

This paper addresses the challenge of accommodating nonlinear dynamics and constraints in rapid trajectory optimization with impulsive maneuvers, envisioned for use in the context of onboard guidance. We present a novel framework that uniquely employs overparameterized monomial coordinates and precomputed fundamental solution expansions to facilitate rapid optimization while minimizing real-time computational requirements. The fundamental solution expansions are precomputed about an uncontrolled reference trajectory using differential algebra. Unlike traditional approaches that repeatedly evaluate the nonlinear dynamics and constraints as part of complex shooting or collocation-based schemes, this method replaces the nonlinearity inherent to dynamics and constraint functions entirely with a computationally simpler manifold constraint. With this approach, trajectory optimization is posed efficiently as a path-planning problem on the manifold. This problem is entirely convex except for the manifold constraint, readily lending itself to solution via sequential convex programming. We demonstrate the effectiveness of our approach in computing fast and accurate Delta V optimal solutions for long-range spacecraft rendezvous, including problems with nonlinear state constraints.

关键词： Orbital Mechanics Structural Kinematics and Dynamics Optimal Control Problem Spacecraft Rendezvous computing and informatics Sequential Convex Programming Robot Kinematics Mathematical Optimization Spacecraft Trajectory Optimization Control Theory

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On the Safety of Multiple Satellite Formations for Synthetic Aperture Radar Applications

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JOURNAL OF GUIDANCE CONTROL AND DYNAMICS 2025年第2期48卷 414-423页

作者： Scala, Francesca Peixoto, Maxwell Nogueira Krieger, Gerhard Villano, Michelangelo German Aerosp Ctr Microwaves & Radar Inst DLR D-82234 Oberpfaffenhofen Germany German Aerosp Ctr Microwaves & Radar Inst Dept Radar Concepts DLR D-82234 Oberpfaffenhofen Germany

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Practical Implementation of Optimal Bang-Bang Evasive Guidance

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JOURNAL OF GUIDANCE CONTROL AND DYNAMICS 2025年第3期48卷 707-713页

作者： Hou, Libing Wang, Junzhi Kuang, Minchi He, Shaoming Beijing Inst Technol Sch Aerosp Engn 5th Zhongguancun South St Beijing 100081 Peoples R China Tsinghua Univ Dept Precis Instrument 30th Shuangqing St Beijing 100084 Peoples R China Beijing Inst Technol Sch Aerosp Engn 5th Zhongguancun South St Beijing 100081 Peoples R China

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Invariant Funnels in the Circular Restricted Three-Body Problem

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JOURNAL OF GUIDANCE CONTROL AND DYNAMICS 2025年第2期48卷 374-383页

作者： Blanchard, Jared T. Lo, Martin W. Anderson, Brian D. Landau, Damon Lee, Nicolas Elschot, Sigrid Stanford Univ Dept Aeronaut & Astronaut 496 Lomita Mall Stanford CA 94305 USA CALTECH Jet Prop Lab Miss Design & Nav Sect 4800 Oak Grove Dr Pasadena CA USA CALTECH Project Syst Engn & Formulat Sect Jet Prop Lab 4800 Oak Grove Dr Pasadena CA USA

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Efficient Two-Way Coupled Analysis of Steady-State Particle-Laden Hypersonic Flows

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JOURNAL OF SPACECRAFT AND ROCKETS 2024年第1期61卷 48-60页

作者： Hinkle, Andrew Hosder, Serhat Johnston, Christopher Missouri Univ Sci & Technol Dept Mech & Aerosp Engn Rolla MO 65409 USA Missouri Univ Sci & Technol Dept Mech & Aerosp Engn Aerosp Engn Rolla MO 65409 USA NASA Langley Res Ctr Aerothermodynam Branch Res Directorate Hampton VA 23681 USA

A direct solution approach for surface erosion in particle-laden hypersonic flows is extended for use in low-cost twoway coupled solutions of dilute gas-particle flows. The trajectory control volume method, which uses a sparse set of probe particles to predict surface erosion distributions on general vehicles, is reformulated for the solution of source terms by mean trajectory subdivision and computing a flux differencing. The approach is verified successfully against a boundary-layer solution and shown to agree well with experimental measurements. A representative Mars entry case, with conditions and geometry based on the ExoMars Schiaparelli capsule, is solved with the approach to study the impact of two-way coupling on surface heating and erosion. Results indicate that, for realistic loading conditions, heating is largely unmodified compared to one-way coupled results at peak heating trajectory conditions, and no measureable difference is observed in the surface erosion rate. At exaggerated loading conditions high enough to observe coupling effects, the worst-case collisional heating can increase heating by up to 60%.

关键词： Particle Laden Flow Boundary Layer Thickness Planets Space Missions computing and informatics Freestream Conditions Supersonic Flow over a Flat Plate Shock Layers Thermal Control and Protection Uncertainty Quantification

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Mistuning Identification of Blisks Using Mass Detuning and Influence Coefficients

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AIAA JOURNAL 2023年第8期61卷 3682-3691页

作者： Cimpuieru, Mihai Kelly, Sean T. T. Lupini, Andrea Keener, Christopher D'Souza, Kiran Epureanu, Bogdan I. I. Univ Michigan Dept Mech Engn Ann Arbor MI 48109 USA Ohio State Univ Dept Mech & Aeronaut Engn Columbus OH 43210 USA

Integrally bladed disks, also known as blisks, are important components in the operation of gas turbines. To study the dynamics of these structures, several computational techniques approximate blisks as tuned systems, where all blades have the same characteristics. In reality, manufactured blades have small variations from their intended design, thus creating so-called mistuned systems. Previous work has shown that such small variations can cause high response amplifications that can result in blisk structural failure. Therefore, it is essential to identify mistuning to ensure the safe operation of these systems. Several methods utilize cantilever blade frequencies in their procedure to model mistuning and calculate blisk vibration response. A previously developed mistuning identification method uses mass detuning to isolate the cantilever blade frequencies and a set of influence coefficients to quantify the blade-to-blade couplings. However, the mistuning is calculated with respect to an arbitrary mistuning value that later needs to be identified through a trial-and-error procedure that can affect the accuracy of the final mistuning values. This paper focuses on updating the method to eliminate this additive error that cannot precisely be determined. Furthermore, the updated procedure is applied to an as-manufactured blisk using experimental ping test results. An additional analysis is performed on the effect of adding multiple sets of influence coefficients to capture the blade-to-blade couplings more accurately.

关键词： Gas Turbine Mechanical Properties computing and informatics Structural Dynamics Nonlinear Dynamics Turbomachinery Modal Analysis Aircraft Engines Vibration Isolation Structural Dynamics and Characterization

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