DEM-FEM-MBD coupling analysis of landing process of lunar lander considering landing mode and buffering mechanism

To obtain the resources of the moon, humans have launched a series of exploration activities on the moon, and the landing buffer device is an indispensable device on the lander required to perform lunar surface exploration missions. It can effectively protect the lander during landing scientific payloads such as instruments on the lander. Based on the mechanical properties and deformation mechanism of the aluminum honeycomb as buffer material, this paper compares and analyzes different simulation schemes and finally establishes the bonding model of the honeycomb by using the discrete element method; the parameters of the honeycomb material are matched through compression experiments to verify the discrete element honeycomb simulation and the feasibility of the scheme and its parameters. To meet the buffering requirements of large landers, a spider web honeycomb structure is proposed, its modeling method is studied by using the discrete element secondary development program, and the model is compressed as a whole to verify the energy consumption characteristics of the spider web honeycomb structure. Aiming at the honeycomb buffer device during the landing process, the cobweb honeycomb buffer structure and its corresponding landing coupling model were established using the discrete element method, the landing process was simulated and analyzed, and the landing results were predicted to verify the feasibility of the device, providing a reference for the design of the lander and its buffer device.

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“…The results are shown in Figure 22. The experimental methods and conclusions correspond well to the research done by Ji [38].…”

Section: The Influence Of Lunar Slope On Landing Cushionsupporting

confidence: 84%

Research on Aluminum Honeycomb Buffer Device for Soft Landing on the Lunar Surface

Wei

Zhang

Zhao

et al. 2021

International Journal of Aerospace Engineering

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“…The XB120R700 hydraulic excavator model was imported into ADAMS, and the motion pair and drive [18,19] were added to the working device. The STEP function in AD-AMS was written to control the arm, bucket rod and bucket to carry out the excavation process according to the preset trajectory.…”

Section: Construction Of Excavator Dynamics Modelmentioning

confidence: 99%

Digging Performance and Stress Characteristic of the Excavator Bucket

Sun,

Wang,

Wang

et al. 2023

Applied Sciences

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In this study, a dynamic–discrete element-finite element coupling method is proposed to investigate the influence of structural parameters on the excavation performance and stress deformation of the bucket. The main research work is as follows: through ADAMS-EDEM co-simulation of the digging process of the bucket, the digging resistance and the loose force of each part of the bucket are obtained. The influence law of the change of the structural parameters of the excavator bucket on the digging resistance, filling rate and energy consumption is revealed. Through the coupling simulation of EDEM-ANSYS, the loose force is introduced into the finite element model of the bucket to enable the coupling of ADAMS-EDEM-ANSYS. The influence of the change of the bucket structure parameters on the stress and deformation of the bucket components is explored. The results show that the cutting angle and angle of throat of the bucket has a major influence on the digging performance of the bucket. While the angle of the throat and the thickness of the ear plate have a minor influence on the digging performance of the bucket. In the process of excavation, the teeth of the bucket are subjected to the largest digging resistance, resulting in relatively large deformation. All of the components of the bucket are subjected to different degrees of excavation resistance, but the stress concentration at the ear plate is the most obvious. The deformation and stress of the whole bucket can be reduced, to some extent, by reducing the thickness of the ear plate along with increasing the thickness of the stiffening plate. The results can be used to improve the digging performance of the bucket and reduce the stress and deformation of the bucket.

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“…The foot-pad serves as the main support component [32]. The primary and secondary struts are filled with aluminum honeycomb material as buffer elements [33,34], as shown in Figure 2. engineering application is provided in Section 5 to illustrate the practicality and effectiveness of the proposed method.…”

Section: A Reliability Series Model For the Lbmmentioning

confidence: 99%

“…The foot-pad serves as the main support component [32]. The primary and secondary struts are filled with aluminum honeycomb material as buffer elements [33,34], as shown in Figure 2. During the free-fall phase, the foot-pad first contacts the planetary surface to prevent the lander from sinking excessively.…”

Section: A Reliability Series Model For the Lbmmentioning

confidence: 99%

Reliability Assessment for a Spacecraft Landing Buffer Mechanism Based on Small Sample Data

Li,

Fu,

2023

Machines

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The landing buffer mechanism (LBM) is a crucial component of aerospace landing explorations, determining the success of the entire mission. Reliability demonstration tests (RDTs) are required to ensure the LBM’s performance meets the design index. However, the RDTs of the LBM often encounter limited samples and zero-failure data, making traditional binominal test programs and reliability assessment methods based on the maximum likelihood theory unsuitable. This paper introduces a novel small-sample test verification method for the LBM, which transforms traditional binominal tests into more informative metrological tests by measuring the buffer strokes of the LBM’s subsystems. Furthermore, a confidence limit theory for the product of subsystem reliability is developed in conjunction with the reliability series model of the LBM. This theory can use the measurement data of subsystems to assess the confidence limit of the LBM’s reliability. An actual engineering application demonstrates that the proposed method can effectively handle zero-failure data and verifies that the LBM’s reliability exceeds 0.9999 with a confidence of 0.9.

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DEM-FEM-MBD coupling analysis of landing process of lunar lander considering landing mode and buffering mechanism

Cited by 31 publications

References 58 publications

Research on Aluminum Honeycomb Buffer Device for Soft Landing on the Lunar Surface

Research on Aluminum Honeycomb Buffer Device for Soft Landing on the Lunar Surface

Digging Performance and Stress Characteristic of the Excavator Bucket

Reliability Assessment for a Spacecraft Landing Buffer Mechanism Based on Small Sample Data

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