Journal of Jilin University(Engineering and Technology Edition) ›› 2023, Vol. 53 ›› Issue (7): 2143-2151.doi: 10.13229/j.cnki.jdxbgxb.20211002

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Identification of critical fragments cutting load of simulated lunar soil based on support vector machine

Ye TIAN1(),Nan-nan LI1,Jun-wei LIU2,Sheng-yuan JIANG2(),Chu WANG3,Wei-wei ZHANG2   

  1. 1.College of Light Industry，Harbin University of Commerce，Harbin 150028，China
    2.Aerospace Mechanism and Control Research Center，Harbin Institute of Technology，Harbin 150001，China
    3.Beijing Aerospace Vehicle Overall Design Department，China Academy of Space Technology，Beijing 100094，China
  • Received:2021-10-03 Online:2023-07-01 Published:2023-07-20
  • Contact: Sheng-yuan JIANG E-mail:tian8154@126.com;jiangshy@hit.edu.cn

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Abstract:

The critical fragments whose average diameter is slightly larger than or equal to the diameter of the bit coring hole will produce two migration modes： hole bottom output and hole wall input in the process of coring drilling， which will lead to the change of drilling load. By establishing the cutting model， it is obtained that the influence of cutting speed on cutting force is small and can be ignored in low-speed cutting. The cutting test is carried out on the critical scale particles with different particle sizes， and the variation curve of cutting load with time is obtained. The cutting load is identified by support vector machine （SVM）. The results show that the recognition rate of homogeneous simulated lunar soil cutting load is 100%， and the recognition rate of simulated lunar soil cutting load with critical scale particles is more than 95.5%. The research results can provide a reference for the on-line identification technology of lunar unmanned drilling sampling.

Key words: terramechanics, simulated lunar soil, support vector machine, cutting speed, cutting force

CLC Number: 

  • TU41

Fig.1

Lunar surface sampling diagram of detector"

Fig.2

Transport characteristics of critical scaleparticles"

Fig.3

Transport mode of critical scale particles"

Fig. 4

Force analysis of cutting edge"

Fig.5

Simulated lunar soil sample"

Table 1

Physical and mechanical parameters of homogeneous lunar soil"

机械参数月壤模拟月壤
密度/（g·cm-3）1.3~2.292.1
内摩擦角/（°）25~5034.96
内聚力/kPa0.26~1.80.35

Fig.6

Schematic diagram of cutting system"

Table 2

Conversion of rotation speed to linear speed"

旋转速度ω/（r·min-1）80100120
切削速度v/（m·s-1）0.06120.07870.0942

Fig.7

Cutting homogeneous simulated lunar soil"

Fig.8

Variation curve of average cutting resistance"

Fig.9

Time domain image of cutting parameters"

Fig.10

Actual classification and prediction classification diagram of test set"

Fig.11

Time domain curve of cutting force"

Fig.12

Migration characteristics of hole bottom output of critical fragments"

Fig.13

Migration characteristics of hole wall input of critical fragments"

Fig.14

Recognition rate"

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