Specific Cutting Resistance of Lunar Regolith Simulant under Low Gravity Conditions

Nakashima, Hiroshi; Shioji, Yasuyuki; Tateyama, Kazuyoshi; Aoki, Shigeru; Kanamori, H.; Yokoyama, T.

doi:10.1299/spacee.1.58

Cited by 28 publications

(20 citation statements)

References 4 publications

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“…All the parameters are set as shown in Table 3, some of which refer to some related papers. [12][13][14][15] Images of the simulation process are presented in Fig. 9(c)-(f ).…”

Section: Structural Parameters Of the Drill Bit And Its Modelingmentioning

confidence: 99%

Research on the Impact of a Drill Bit on the Original State of Artificial Lunar Soil using DEM Simulation

Hou

Deng

Yue

et al. 2016

Trans. Japan Soc. Aero. S Sci.

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For a better original state and scientific value of lunar soil samples, research on the impact of drill bits on the perturbation rate based on DEM was carried out. A simulated model of lunar soil was established based on the linear adhesion contact model. The parameters of the model were determined by matching between the mechanics and discrete elements. The evaluation criteria of the original states of the lunar soil samples were built on the basis of actual project needs. Based on this, some simulations for the drilling and sampling of lunar soil with different drill bits were carried out. The impact of drill bit parameters, such as internal diameter, cutting angle and height of bottom-out blade on the perturbation rate, was studied. It is shown by the results that the perturbation rate decreases with both the internal diameter and the height of the bottom-out blade, and there is a minimum value with cutting angle. For the best perturbation rate of lunar soil samples under the constraint conditions of the project, the internal diameter should be 18 mm, cutting angle should be 90°, and height of bottom-out blade should be 5 mm.

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“…All the parameters are set as shown in Table 3, some of which refer to some related papers. [12][13][14][15] Images of the simulation process are presented in Fig. 9(c)-(f ).…”

Section: Structural Parameters Of the Drill Bit And Its Modelingmentioning

confidence: 99%

Research on the Impact of a Drill Bit on the Original State of Artificial Lunar Soil using DEM Simulation

Hou

Deng

Yue

et al. 2016

Trans. Japan Soc. Aero. S Sci.

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“…The wheel-terrain contact model, as described in (20)- (22) below, calculates each external force. N e is the external moments acting at the centroid of each wheel.…”

Section: A Vehicle Dynamic Modelmentioning

confidence: 99%

Statistical mobility prediction for planetary surface exploration rovers in uncertain terrain

Ishigami

Kewlani

Iagnemma

2010

2010 IEEE International Conference on Robotics and Automation

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Planetary surface exploration rovers must accurately and efficiently predict their mobility on natural, rough terrain. Most approaches to mobility prediction assume precise a priori knowledge of terrain physical parameters, however in practical scenarios knowledge of terrain parameters contains significant uncertainty. In this paper, a statistical method for mobility prediction that incorporates terrain uncertainty is presented. The proposed method consists of two techniques: a wheeled vehicle model for calculating vehicle dynamic motion and wheel-terrain interaction forces, and a stochastic response surface method (SRSM) for modeling of uncertainty. The proposed method generates a predicted motion path of the rover with confidence ellipses indicating the probable rover position due to uncertainty in terrain physical parameters. Rover orientations and wheel slippage are also predicted. The computational efficiency of SRSM as compared to conventional Monte Carlo methods is shown via numerical simulations. Experimental results of rover travel over sloped terrain in two different uncertain terrains are presented that confirms the utility of the proposed mobility prediction method.

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“…However, the lunar environment is substantially different from the terrestrial one, presenting unique features due to the extreme temperature, high-vacuum condition and lower gravity (Heiken et al, 1991), which lead to the observed peculiar mechanical behavior of lunar regolith (Mitchell et al, 1972a, b;Carrier et al, 1973;Jaffe, 1973;Scott, 1987;Smith, 1993;Johnson and Chua, 1993;Batiste and Lankton, 2006;Schultz, 2006) and its interaction with surrounding structures (Perkins et al, 1990(Perkins et al, , 1992Perkins, 1991;Nakashima et al, 2008). Therefore, the mechanical response of lunar soils cannot be simply assumed to be the same as the one of terrestrial materials, but requires a specific investigation.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, Nakashima et al (2008) investigated the response to excavations of lunar soil simulants by running physical experiments under terrestrial conditions. Ding et al (2011) used the same technique to investigate the regolith-wheel interaction for rovers.…”

Section: Introductionmentioning

confidence: 99%

“…It is precisely because of these difficulties in experimental study of lunar excavation that the discrete element method (DEM) will be employed in our present study whereby the response of the ground to a vertically supported excavation will be numerically investigated. In the past, DEM analyses have been already employed to model lunar regolith (Nakashima et al, 2008;Bui et al, 2009;Modenese et al, 2012;Jiang et al, 2012bJiang et al, , 2013a, and to investigate several complex boundary-value problems, such as the penetration mechanism under different conditions ( Jiang et al, 2006b( Jiang et al, , 2007a( Jiang et al, , 2008, the earth pressure on tunnel lining (Jiang and Yin, 2012) and the stability of cut slopes (Utili and Nova, 2008;Utili and Crosta, 2011;Jiang and Murakami, 2012). In this paper, the influence of van der Waals forces will be taken into account for the first time on the ground response due to the excavation and on the assessment of the stability of the retaining wall, overcoming some of the current limitations encountered by physical experiments.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

DEM modeling of cantilever retaining excavations: implications for lunar constructions

Jiang

Shen

Utili

2016

Engineering Computations

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Users who downloaded this article also downloaded: (2016),"Simulation of one dimension shock initiation of condensed explosive by SPH method", Engineering Computations, Vol. 33 Iss 2 pp. 528-542 http://dx. (2016),"Routing algorithm with QoS constraints for real time multicast communications using particle swarm optimization and genetic meta-optimizer", Engineering Computations, Vol. 33 Iss 2 pp. 344-365 http://dx.(2016),"A new strain-based finite element for plane elasticity problems", Engineering Computations, Vol. 33 Iss 2 pp. 562-579 http://dx.If you would like to write for this, or any other Emerald publication, then please use our Emerald for Authors service information about how to choose which publication to write for and submission guidelines are available for all. Please visit www.emeraldinsight.com/authors for more information. About Emerald www.emeraldinsight.comEmerald is a global publisher linking research and practice to the benefit of society. The company manages a portfolio of more than 290 journals and over 2,350 books and book series volumes, as well as providing an extensive range of online products and additional customer resources and services.Emerald is both COUNTER 4 and TRANSFER compliant. The organization is a partner of the Committee on Publication Ethics (COPE) and also works with Portico and the LOCKSS initiative for digital archive preservation. AbstractPurpose -Retained excavation is important for future lunar exploratory missions and potential human colonization that requires the construction of permanent outposts. Knowledge in excavation obtained on the earth is not directly applicable to lunar excavation because of the low lunar gravity and the non-negligible adhesive van der Waals interactions between lunar regolith grains. The purpose of this paper is to reveal how the gravity level and lunar environment conditions should be considered to extend the knowledge in earth excavation response to lunar excavation. Design/methodology/approach -Two-dimensional discrete element method simulations were carried out to investigate the respective effect of gravity level and lunar environment conditions (highvacuum and extreme temperature) on retained excavation response. A novel contact model was employed with a moment -relative rotation law to account for the angularity of lunar soil particles, and a normal attractive force to account for the van der Waals interactions. Findings -The simulation results showed that the excavation response is non-linearly related to the gravity level. Van der Waals interactions can increase the dilatancy of lunar regolith and, surprisingly as a consequence, significantly increase the bending moment and deflection of the retaining wall, and the ground displacements. Based on the simulation results, a parabola model was proposed to predict the excavation-induced lateral ground movements on the moon. Originality/value -This study indicates that an unsafe estimate of the wall response to an excavation on the moon would be obtained if only the effect of gravity is...

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Specific Cutting Resistance of Lunar Regolith Simulant under Low Gravity Conditions

Cited by 28 publications

References 4 publications

Research on the Impact of a Drill Bit on the Original State of Artificial Lunar Soil using DEM Simulation

Research on the Impact of a Drill Bit on the Original State of Artificial Lunar Soil using DEM Simulation

Statistical mobility prediction for planetary surface exploration rovers in uncertain terrain

DEM modeling of cantilever retaining excavations: implications for lunar constructions

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