Hierarchical Optimization of Landing Performance for Lander with Adaptive Landing Gear

Zongmao, Ding; Wu, Haiyuan; Wang, Chunjie; Jian, Ding

doi:10.1186/s10033-019-0331-0

Cited by 18 publications

(9 citation statements)

References 9 publications

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“…Footpads contribute a lot in the buffering process, and the contact between the footpad and the Mars surface is modeled with a normal impact force and a tangential force. The normal impact is computed by a nonlinear spring-damping model, and the tangential force is obtained by the Coulomb friction model, as those presented in previous studies (Ding and Wang, 2016; Ding et al , 2019; Dong et al , 2019).…”

Section: Dynamics Modeling For the Mars Landermentioning

confidence: 99%

“…Zheng et al (2018) analyzed the landing performance of a lunar lander and optimized seven design parameters of the landing gear using the RS model as an alternative to the finite element model. Ding et al (2019) established the RS model for a lunar lander based on the sensitivity analysis results and conducted the optimization design of the adaptive landing gear. Wu et al (2018) and Liu et al (2018) optimized the landing gears with RS models for better landing performances and used the Kriging model (Wu et al , 2018) for the model update.…”

Section: Introductionmentioning

confidence: 99%

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Stability analysis of Mars soft landing under uncertain landing conditions and two landing strategies

Jian

Liu

Yang

et al. 2022

AEAT

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Purpose The purpose of this paper is to study the landing performance of the Mars lander considering uncertain landing conditions under two landing modes. Design/methodology/approach A dynamics analysis model for the legged Mars lander is established for landing simulation, where the nonlinear large-deformation flexible buffer rods are equivalently modeled with a rigid-body mechanism with external forces and movement limit. Sensitivities of the landing stability to various landing conditions are analyzed using the Quasi–Monte-Carlo-based Sobol’ method and computer-aided landing simulations. Moreover, based on the results of sensitivity analysis, sensitive parameters are selected for estimating the safe boundaries for stability indices of rotation and clearance. Findings It can be concluded from this study that the lander has excellent ability against overturning. The shutdown-before-touchdown strategy helps to maintain than landing pose, and the shutdown-at-touchdown strategy helps to prevent the nozzle from colliding with the surface of Mars. Practical implications This study provides a theoretical reference to choose the better landing strategies for Mars landers considering uncertain landing conditions. Originality/value A parameterized dynamics Mars lander model and a simplification method are proposed to simulate the landing on Mars. Uncertain landing conditions are parameterized and considered in the dynamics model. Sensitivity analysis and safe boundary methods are used to compare the landing performances with two landing strategies.

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Section: Dynamics Modeling For the Mars Landermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Stability analysis of Mars soft landing under uncertain landing conditions and two landing strategies

Jian

Liu

Yang

et al. 2022

AEAT

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“…The fifth landing gear was proposed to ensure slope landing [14]. The sixth landing gear was established for landers to satisfy various landing requirements [15]. The seventh landing gear is an adaptive landing gear for the sloped landing of launch vehicles and landers [16].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Rocket Modelling Accuracy and Capsule Landing Safety

Huang

2022

Int. J. Aeronaut. Space Sci.

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The capability of performing vertical landing accurately and safely is of great concern for reusable rockets, some of which might carry manned capsules. According to previous technologies, the rocket needs to accurately land on a drone ship that has a limited size of 70 m × 50 m, whereas the capsule needs to safely land on a soil terrain that might be oblique. Currently, there has been various research supporting the landing processes of rockets and capsules. Regardless of the disparity of such research, the accuracy and safety are the essential indicators to be considered. This paper develops a more accurate landing model for rockets by reviewing valid methodologies for error mitigation. The position error of the rocket (13.46 m) is smaller than the radius of the terminal dock of the drone ship (25 m); thus, the modelling accuracy of the rocket is within its accuracy requirement (with a 95% probability). After the performance in terms of accuracy is quantified, a novel landing gear is designed to deal with sloped terrains, which might have a negative effect on landing safety. The struts of the novel landing gear include actuators, buffer struts, and a scanning system. This scanning system is used to extract sloped terrain information, and then the actuators are used for the adjustment of different landing struts, ensuring that these struts touch the sloped terrain at the same time. Compared with conventional landing struts, the novel landing gear is used to increase the buffer efficiencies of the buffer struts.

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“…For example, the landing mechanical properties of the landing gear with fixed design parameters were studied [9]. The sensitivity factors of the landing gear were studied, and the design parameters of the landing gear were optimized [10]. There are also many theories about wear problem [11].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Sensitive Parameters Affecting Unlocking Force of Finger Lock in Landing Gear

Zhang

Nie

2021

International Journal of Aerospace Engineering

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The mechanical characteristics of the unlocking force of the landing gear finger lock were studied in this paper, the influence of its diameter, fingertip angle, wear, and other factors on the unlocking force in one complete working cycle was analyzed, and the sensitive parameters that affect the unlocking force were obtained. Firstly, the unlocking force and wear of finger lock were calculated theoretically, and the changing rule of the unlocking force and wear with each parameter was obtained. Then, the validity of the correlation coefficient and model was verified by experiment. Finally, combined with the effective coefficient obtained from the experiment, the Archard wear model was used to simulate the change rule of lock force. The results show that in one complete working cycle, the inner surface diameter is negatively related to the unlocking force, fingertip diameter has little effect on the unlocking force, fingertip angle is negatively related to the unlocking force, and wear is positively related to the unlocking force; friction coefficient and fingertip angle are high sensitive parameters that affect the unlocking force, which have obvious effect on the unlocking force. The inner surface diameter, fingertip diameter of finger lock, and wear are the low sensitive parameters that affect the unlocking force, and the influence on the unlocking force is weak.

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Hierarchical Optimization of Landing Performance for Lander with Adaptive Landing Gear

Cited by 18 publications

References 9 publications

Stability analysis of Mars soft landing under uncertain landing conditions and two landing strategies

Stability analysis of Mars soft landing under uncertain landing conditions and two landing strategies

Analysis of Rocket Modelling Accuracy and Capsule Landing Safety

Analysis of Sensitive Parameters Affecting Unlocking Force of Finger Lock in Landing Gear

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