Journal of Jilin University(Engineering and Technology Edition) ›› 2024, Vol. 54 ›› Issue (5): 1482-1492.doi: 10.13229/j.cnki.jdxbgxb.20230666

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Design and experiment of biomimetic sliding plate for rice direct seeding machine based on loach body surface

Guo-zhong ZHANG1,2(),Kai-quan DING1,2,Zheng-bo LI1,2,Long CHEN1,2,Nan-rui TANG1,2,Wan-ru LIU1,2,Hai-dong HUANG1,2,Yong ZHOU1,2,Hong-chang WANG1,2()   

  1. 1.College of Engneering，Huazhong Agricultural University，Wuhan 430070，China
    2.Key Laboratory of Agricultural Equipment in Mid-lower Yangtze River，Ministry of Agriculture and Rural Affairs，Wuhan 430070，China
  • Received:2023-10-12 Online:2024-05-01 Published:2024-06-11
  • Contact: Hong-chang WANG E-mail:zhanggz@mail.hzau.edu.cn;wanghc84@mail.hzau.edu.cn

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Abstract:

In response to the problem of heavy adhesion and high resistance of the rice direct seeder skateboard in the disturbed and saturated paddy field， the non-smooth surface of the loach body was observed microscopically； Using Fluent software for simulation and analysis， the principle of reducing viscosity and resistance on the non-smooth surface has been revealed； The Box Behnken response surface method was used to design the experiment and obtain the regression equations of the total resistance FB of the non-smooth surface of the groove with the groove width w， groove depth h， and inflow velocity v. The optimization analysis results showed that the maximum drag reduction rate reached 10.052% when w was 4.5 mm， h was 4 mm， and v was 1.25 m/s； Based on the optimal parameters， a biomimetic sliding plate for rice direct seeding machine was designed， and indoor paddy soil tank experiments were conducted， with a drag reduction rate of 10.23% ultimately. This study can provide new ideas for the development of viscosity reduction and resistance reduction technology for paddy field soil contacting components.

Key words: agricultural mechanization engineering, loach biomimetic, non-smooth surface, paddy soil, reduce adhesion and resistance

CLC Number: 

  • S233.71

Fig.1

Rheometer test"

Fig.2

Computational domain model for biomimetic non-smooth surfaces"

Table 1

Single factor experimental arrangement"

序号试验因素
沟宽/mm沟深/mm来流速度/（m·s-1）
13，3.5，4，4.5，541
243，3.5，4，4.5，51
3440.25，0.5，0.75，1，1.25

Table 2

Test factor level coding"

编码沟宽/mm沟深/mm来流速度/（m·s-1）
-1430.75
04.53.51
1541.25

Table 3

BBD test plan and results"

序号

w/

mm

h/

mm

v/

（m·s-1）

仿生表面

总阻力/N

光滑表面 总阻力/N

减阻率/

%

1000243.141270.0679.970
21-10245.010270.2689.346
3-10-1186.032206.75410.023
4011311.008345.76310.052
5101304.679338.4689.983
60-11305.898338.9909.762
7-110252.271276.1418.644
8110249.157275.2419.477
90-1-1182.567202.1819.701
1001-1185.699206.44910.051
11-101311.533345.7639.900
12-1-10250.213276.2209.415
13000243.141270.0679.970
1410-1181.819201.8619.929
15000243.141270.0679.970

Fig.3

Structural parameters of bionic non-smooth sliding plate model"

Fig.4

Bionic non-smooth sliding plate model test in paddy soil tank"

Fig.5

Surface characteristics of loach scales"

Fig.6

Microstructural characteristics of scales"

Fig.7

Rheological curves of paddy soil with 5 different moisture contents"

Table 4

Fitting results of BC segment H-B model for 5 soil samples with different moisture contents"

含水率/%拟合结果
屈服应力τ0/Pa

稠度系数

k/（Pa·s-1）

幂律指数nR2
401823.636455.870.950.964
45831.261264.580.420.960
50131.91401.700.550.986
55120.4578.160.630.992
6016.2224.170.600.990

Fig.8

Velocity nephogram and streamline diagram"

Fig.9

Data analysis results"

Fig.10

Single factor test results"

Table 5

Regression model variance analysis"

来源平方和自由度均方F值P值
模型31 016.1193 446.2311 694.84<0.000 1
w46.96146.96159.37<0.000 1
h26.09126.0988.540.000 2
v30 876.25130 876.251.05E+05<0.000 1
wh1.0911.093.70.112 2
wv1.7411.745.920.059 2
hv0.97810.9783.320.128 1
w230.46130.46103.360.000 2
h236.62136.62124.250.000 1
v20100.000 10.993 6
残差1.4750.294 7
失拟项1.4730.491 1
纯误差020
总计31 017.5814

Fig.11

Effect of interaction among factors on the total resistance of bionic non-smooth surfaces"

Table 6

Soil tank test results"

序号仿生非光滑滑板模型的运动阻力FB /N光滑滑板模型的运动阻力FS /N减阻率Dec/%
平均值139.53155.4310.23
1136.23150.639.56
2137.38155.7911.82
3140.87155.789.57
4142.74160.4611.04
5140.43154.489.10
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