A Pattern Search Method to Optimize Mars Exploration Trajectories

Choi, Su-Jin; Kang, Hongjae; Lee, Keejoo; Kwon, Sejin

doi:10.3390/aerospace10100827

Cited by 3 publications

(2 citation statements)

References 25 publications

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“…The modular vector method, also known as the step acceleration method, is a technique utilized to expedite the optimization of the valley line (ridge line) direction. This method presents notable advantages, particularly in addressing unconstrained extreme value problems [34].…”

Section: Principles and Optimization Steps Of The Improved Modular Ve...mentioning

confidence: 99%

Research on Mining Subsidence Prediction Parameter Inversion Based on Improved Modular Vector Method

Chai,

Xu,

Guan

et al. 2023

Applied Sciences

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In this study conducted in the Shendong mining area, this paper tackles the challenge of estimating mining subsidence parameters in the absence of empirical values. The study employs a tailored pattern recognition method specifically designed for mining subsidence in a specific working face. The goal is to determine a globally approximate optimal solution for these parameters. Subsequently, this study utilizes the approximate optimal solution as an initial exploration value and harnesses the modular vector method to obtain stable, accurate, optimal solutions for the parameters. The results of the study demonstrate the effectiveness of the improved modular vector method. In simulation tests involving the subsidence coefficient, the main influence angle tangent value, the propagation angle of mining influence, and the deviation of the inflection point, the relative errors do not exceed 1.2%, 1.9%, 1.7%, and 7.9%, respectively. Furthermore, when subjected to random errors of less than 20 mm, the relative errors for each parameter remain below 2%. Even in conditions with 200 mm gross error, the relative error for each parameter does not exceed 5.1%, indicating high precision. In an engineering example, the root mean square error of the improved modular vector method’s fitting result is 64.31 mm, constituting a mere 1.79% of the maximum subsidence value. This performance surpasses that of the genetic algorithm (70.47 mm), particle swarm algorithm (72.82 mm), and simulated annealing algorithm (75.45 mm). Notably, the improved modular vector method exhibits superior stability and reduced reliance on the quantity of measured values compared to the three aforementioned algorithms. The inversion analysis of predicted parameters based on the improved modular vector method, coupled with the probability integral method, holds practical significance for enhancing the accuracy of mining subsidence prediction.

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Section: Principles and Optimization Steps Of The Improved Modular Ve...mentioning

confidence: 99%

Research on Mining Subsidence Prediction Parameter Inversion Based on Improved Modular Vector Method

Chai,

Xu,

Guan

et al. 2023

Applied Sciences

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“…The advancement of spacecraft technology has sparked a growing interest among researchers in deep space exploration, as evidenced by the increasing utilization of observation payloads on spacecraft to study distant celestial objects, and the ability to closely approach and investigate specific celestial bodies [1][2][3][4][5][6]. Consequently, drag-free control has emerged as a highly regarded technique in aerospace engineering due to its capacity for providing a stable platform in scientific spacecrafts [7], particularly for some in-orbit scientific experiments, or provide a observation platform for gravitational waves from deep space [8][9][10][11][12][13][14][15][16][17][18][19], i.e., the TianQin mission [11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Design and Analysis of the Integrated Drag-Free and Attitude Control System for TianQin Mission: A Preliminary Result

Hao,

Zhang

2024

Aerospace

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This article explores novel in-orbit drag-free technology that can be utilized for deep space detection scientific missions. In this study, we considered a two-test-mass drag-free method and analyzed the design of the drag-free and attitude control system for the TianQin mission. The entire control system was comprehensively designed, including an actuator allocation design and controllers for two test masses and one spacecraft, with a total of 18 degrees of freedom. Furthermore, stability analysis was conducted. Based on our design, numerical analysis and simulations were performed assuming geocentric orbit conditions in the TianQin mission, confirming the feasibility of this aerospace engineering concept. The versatility of the design allows for its application to scientific observations across various disciplines by modifying the structure of the simulation environment, and consequently, the approach discussed in this study holds significant practical implications for effectively accomplishing deep space observation tasks.

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Seasonal Variations in Lunar-Assisted GEO Transfer Capability for Southward Launch

Choi,

Lee

2024

Aerospace

Self Cite

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The launch azimuth of the Naro Space Center is limited toward the south of the Korean peninsula, at 170 ± 10 degrees, suitable for the polar orbit, sun-synchronous orbit, and safety range issues. In this circumstance, one option to send a satellite into GEO is to perform a dog-leg maneuver during ascent, thus forming a medium-inclination orbit under such a restrictive condition. However, this option requires an immense amount of energy for the dog-leg maneuver, as well as a plane change maneuver. The only remaining option is to raise the apogee to the Moon, utilizing lunar gravity to lower the inclination to near zero and then returning to the vicinity of the Earth at an altitude of 35,786 km without maneuver. In order to design lunar-assisted GEO transfer, all feasible paths are defined, but questions remain about how seasonal variations affect all these potential paths. Therefore, this study aims to design and analyze all available trajectories for the year 2031 using a high-fidelity dynamic model, root-finding algorithm, and well-arranged initial conditions, focusing on the impact of seasonal trends. The simulation results indicate that cislunar free-return trajectories generally require less ΔV compared to circumlunar free-return trajectories, and circumlunar trajectories are minimally affected by lunisolar effects due to their relatively short return time of flight. Conversely, cislunar trajectories show seasonal variations, so spring and fall seasons require up to 20 m/s less ΔV than summer and winter seasons due to the relatively long time of return duration.

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A Pattern Search Method to Optimize Mars Exploration Trajectories

Cited by 3 publications

References 25 publications

Research on Mining Subsidence Prediction Parameter Inversion Based on Improved Modular Vector Method

Research on Mining Subsidence Prediction Parameter Inversion Based on Improved Modular Vector Method

Design and Analysis of the Integrated Drag-Free and Attitude Control System for TianQin Mission: A Preliminary Result

Seasonal Variations in Lunar-Assisted GEO Transfer Capability for Southward Launch

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