Journal of Jilin University(Engineering and Technology Edition) ›› 2024, Vol. 54 ›› Issue (4): 1144-1152.doi: 10.13229/j.cnki.jdxbgxb.20220623

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Bionic pit design and experiment of the sucker

Qian CONG1,2(),Jin XU1,3,Xiao-jie SHI1,3,Jing-fu JIN1,3,Ting-kun CHEN1,3()   

  1. 1.College of Biological and Agricultural Engineering，Jilin University，Changchun 130022，China
    2.State Key Laboratory of Automotive Simulation and Control，Jilin University，Changchun 130022，China
    3.Key Laboratory of Bionic Engineering，Ministry of Education，Jilin University，Changchun 130022，China
  • Received:2022-05-21 Online:2024-04-01 Published:2024-05-17
  • Contact: Ting-kun CHEN E-mail:congqian@jlu.edu.cn;chentk@jlu.edu.cn

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Abstract:

To improve the adsorption performance of the sucker， the study used bionics to design the pit structure on the surface of the normal sucker. So， there were multiple small suction cups on the working surface of the sucker during the adsorption process to improve the suction performance of the sucker. Partial orthogonal polynomial regression analysis was used to explore the influence of the diameter of the pit shape， the number of single-row annularly distributed pits， and the row spacing on the adsorption force of the sucker. The test showed that the sucker with different morphological parameters on the surface had different effects on the adsorption force of the sucker. When the pit diameter was 1.5 mm， the number of single-row annular pits was 40， and the row spacing was 4 mm， the adsorption force of the bionic sucker on the substrate surface was 49.54 N. Compared with the normal sucker， the maximum adsorption force of the bionic sucker on the substrate surface was increased by 49.21%. The mathematical regression model was established between the design factors and the evaluation index. The response surface method was used to analyze the significant factors affecting the pit parameters on the adsorption force of the bionic sucker. The significant order of the influence on the sucker adsorption force was determined as row spacing， pit diameter， and the number of single-row annular distribution pits. The analysis showed that the shape of the pits on the working surface changed the distribution of contact pressure and friction stress on the working surface of the sucker. The pit shape increased the friction stress and contact pressure at the edge of the pit. In addition， the friction stress and contact pressure of the working surface of the bionic sucker were greater than that of the standard sucker， which improved the adsorption force of the bionic sucker on the surface of the substrate. This present study would help to improve the adsorption performance of the sucker by designing bionic pits on the working surface of the sucker.

Key words: bionic, pit, sucker, adsorption force, adsorption mechanism, design and experiment

CLC Number: 

  • TB17

Fig.1

Surface microscopic morphology of the sucker of leech"

Fig.2

Bionic sucker design diagram"

Table 1

Factors and code levels of tests"

水平因素
凹坑直径z1/mm单排凹坑数量z2排间距z3/mm
10.5302
21.0403
31.5504

Fig.3

Preparation process of the sucker"

Fig.4

Prepared the sucker sample"

Fig.5

Adsorption force of the sucker"

Fig.6

Adsorption force of sucker"

Table 2

Repeated test of optimal factor combination of bionic sucker"

试验序号z1/mmz2z3/mmy8/N
11.540448.98

Se=0.285

fe=2

21.540449.43
31.540449.73

Table 3

Variance analysis of the regression model of adsorption force"

试验编号X0X1（z1）X2（z1）X1（z2）X2（z2）X1（z3）X2（z3）
11-11-11-11
21-110-20-2
31-111111
410-2-1111
510-20-2-11
610-2110-2
7111-110-2
81110-211
911111-11
bj44.5631.8480.0851.130-0.4732.722-0.415
Sj20.4980.1307.6614.03344.4453.100
Fj143.8460.91353.76428.300311.89421.755
αj0.01>0.250.050.050.010.05
回归检验

S=80.6116，f=8；S回=79.7371，f回=5；SR=0.8745，fR=3；Se=0.285，fe=2；Slf=0.5895，flf=1；

F回=54.7071>F0.01（5，3）=28.24；Flf=0.57<F0.25（1，2）=2.57

Fig.7

Influence of parameters of the bionic pit on adsorption force"

Fig.8

Finite element analysis results of suckers"

Fig.9

Stress and sliding models of normal and bionic suckers"

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