NL2033205B1 - Optimization method for subsoiling shovel - Google Patents

Optimization method for subsoiling shovel Download PDF

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Publication number
NL2033205B1
NL2033205B1 NL2033205A NL2033205A NL2033205B1 NL 2033205 B1 NL2033205 B1 NL 2033205B1 NL 2033205 A NL2033205 A NL 2033205A NL 2033205 A NL2033205 A NL 2033205A NL 2033205 B1 NL2033205 B1 NL 2033205B1
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Prior art keywords
curved
shovel
analysis
optimization
subsoiling
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NL2033205A
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Dutch (nl)
Inventor
Liu Xinwei
Li Zengqiang
Song Xiangyun
Cui Dejie
Wang Jingkuan
Wang Jingde
Zhang Xiaoguang
Du Haiyan
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Univ Qingdao Agricultural
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Priority to NL2033205A priority Critical patent/NL2033205B1/en
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    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01B—SOIL WORKING IN AGRICULTURE OR FORESTRY; PARTS, DETAILS, OR ACCESSORIES OF AGRICULTURAL MACHINES OR IMPLEMENTS, IN GENERAL
    • A01B13/00—Ploughs or like machines for special purposes ; Ditch diggers, trench ploughs, forestry ploughs, ploughs for land or marsh reclamation
    • A01B13/08—Ploughs or like machines for special purposes ; Ditch diggers, trench ploughs, forestry ploughs, ploughs for land or marsh reclamation for working subsoil
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01B—SOIL WORKING IN AGRICULTURE OR FORESTRY; PARTS, DETAILS, OR ACCESSORIES OF AGRICULTURAL MACHINES OR IMPLEMENTS, IN GENERAL
    • A01B13/00—Ploughs or like machines for special purposes ; Ditch diggers, trench ploughs, forestry ploughs, ploughs for land or marsh reclamation
    • A01B13/08—Ploughs or like machines for special purposes ; Ditch diggers, trench ploughs, forestry ploughs, ploughs for land or marsh reclamation for working subsoil
    • A01B13/10—Special implements for lifting subsoil layers

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Soil Sciences (AREA)
  • Environmental Sciences (AREA)
  • Foundations (AREA)

Abstract

The present invention provides an optimization method for a subsoiling shovel, including performing force analysis on a curved subsoiling shovel to obtain 5 a two-dimensional structural diagram, carrying out two-dimensional diagram drawing and three-dimensional modeling of the curved subsoiling shovel successively according to measured working parameters and actual dimensions of a subsoiler to obtain a three-dimensional model, importing the three-dimensional model to finite element analysis software for analysis to obtain an analysis result, 10 and obtaining set load condition, constraints and performance indicators and performing topology optimization on material distribution of the curved subsoiling shovel based on the analysis result to obtain an optimization result. In the present invention, topology optimization is carried out so that the resistance to a subsoiler in the process of advancing becomes smaller. Thus, the energy efficiency of tillage 15 is improved.

Description

OPTIMIZATION METHOD FOR SUBSOILING SHOVEL
Technical Field
The present invention relates to the technical field of design and manufacture of agricultural machinery, and in particular, to an optimization method for a subsoiling shovel.
Background Art
Subsoiling is a tillage method for effectively breaking a plow pan. A key working part for subsoiling operation, namely a subsoiling shovel, may be impeded by great resistance with high energy consumption in the working process of breaking the plow pan. Besides, since it is difficult to accurately obtain tilling depth information in real time during subsoiling, the quality of the subsoiling operation cannot be guaranteed. These severely limit the promotion and application of the subsoiling operation. Traditional subsoiling implements may be faced with problems such as great subsoiling resistance, serious implement abrasion and high energy consumption during the subsoiling operation. Moreover, due to great subsoiling resistance, some large-sized traction apparatuses for farming machinery, for example, a large tractor, may press soil repeatedly, causing farmland soil to be further compacted, leading to the degradation of farmland quality.
Summary of the Invention
An objective of the present invention provides an optimization method for a subsoiling shovel in order to overcome the drawbacks in the prior art.
To achieve the above objective, the present invention provides the following solution.
An optimization method for a subsoiling shovel includes: performing force analysis on a curved subsoiling shovel to obtain a two- dimensional structural diagram; carrying out two-dimensional diagram drawing and three-dimensional modeling of the curved subsoiling shovel successively according to measured working parameters and actual dimensions of a subsoiler to obtain a three-dimensional model; importing the three-dimensional model to finite element analysis software for analysis to obtain an analysis result; and obtaining set load condition, constraints and performance indicators and performing topology optimization on material distribution of the curved subsoiling shovel based on the analysis result to obtain an optimization result.
Preferably, importing the three-dimensional model to finite element analysis software for analysis to obtain an analysis result includes: performing meshing on the three-dimensional model to obtain a mesh model of the curved subsoiling shovel; obtaining a load and a boundary condition of the curved subsoiling shovel; and carrying out displacement fringe analysis and stress fringe analysis of the curved subsoiling shovel based on the mesh model, the load and the boundary condition to obtain the analysis result.
Preferably, the finite element analysis software is ANSYS software.
Preferably, software for the three-dimensional modeling is UG software.
Preferably, a format of the three-dimensional model is prt.
Preferably, after obtaining set load condition, constraints and performance indicators and performing topology optimization on material distribution of the curved subsoiling shovel based on the analysis result to obtain an optimization result, the optimization method further includes: determining structural features of the curved subsoiling shovel based on the optimization result; constructing an optimization function for the curved subsoiling shovel based on the structural features; determining constraints based on stress information, frequency information and boundary information of the curved subsoiling shovel; and optimizing the optimization function by particle swarm optimization based on the constraints to obtain the mass of the optimized curved subsoiling shovel.
According to specific embodiments provided in the present invention, the present invention has the following technical effects:
The present invention provides an optimization method for a subsoiling shovel, including performing force analysis on a curved subsoiling shovel to obtain a two- dimensional structural diagram, carrying out two-dimensional diagram drawing and three-dimensional modeling of the curved subsoiling shovel successively according to measured working parameters and actual dimensions of a subsoiler to obtain a three-dimensional model, importing the three-dimensional model to finite element analysis software for analysis to obtain an analysis result, and obtaining set load condition, constraints and performance indicators and performing topology optimization on material distribution of the curved subsoiling shovel based on the analysis result to obtain an optimization result. In the present invention, topology optimization is carried out so that the resistance to the subsoiler in the process of advancing becomes smaller. Thus, the energy efficiency of tillage is improved.
Brief Description of the Drawings
To describe the technical solutions in the embodiments of the present invention or in the prior art more clearly, the accompanying drawings required in the embodiments will be briefly described below. Apparently, the accompanying drawings in the following description show merely some embodiments of the present invention, and other drawings can be derived from the accompanying drawings by those of ordinary skill in the art without creative efforts.
FIG. 1 is a flowchart of a method according to an embodiment of the present invention.
FIG. 2 is a two-dimensional structural diagram according to an embodiment of the present invention.
FIG. 3 is a diagram of force analysis according to an embodiment of the present invention.
FIG. 4 is a front view of a curved subsoiling shovel according to an embodiment of the present invention.
FIG. 5 is a side view of a curved subsoiling shovel according to an embodiment of the present invention.
FIG. 6 is a schematic diagram of modeling of a subsoiler frame according to an embodiment of the present invention.
FIG. 7 is a schematic diagram of modeling of a soil preparation roller of a subsoiler according to an embodiment of the present invention.
FIG. 8. is a side view of an assembly diagram of a curved subsoiler according to an embodiment of the present invention.
FIG. 9is a front view of a curved subsoiler according to an embodiment of the present invention.
FIG. 10 is a schematic diagram of a three-dimensional model of a curved subsoiler according to an embodiment of the present invention.
FIG. 11 is a schematic diagram of a simplified model of a curved shovel according to an embodiment of the present invention.
FIG. 12 is a schematic diagram of meshing of a curved subsoiling shovel according to an embodiment of the present invention.
FIG. 13 is a schematic diagram of the mesh quality of a curved subsoiling shovel according to an embodiment of the present invention.
FIG. 14 is a schematic diagram of a boundary condition of a curved subsoiling shovel according to an embodiment of the present invention.
FIG. 15 is a first diagram of displacement fringes of a curved subsoiling shovel according to an embodiment of the present invention.
FIG. 16 is a second diagram of displacement fringes of a curved subsoiling shovel according to an embodiment of the present invention.
FIG. 17 is a first diagram of stress fringes of a curved subsoiling shovel according to an embodiment of the present invention.
FIG. 18 is a second diagram of stress fringes of a curved subsoiling shovel according to an embodiment of the present invention.
FIG. 19 is a first schematic diagram of an optimization result of a curved subsoiling shovel according to an embodiment of the present invention.
FIG. 20 is a second schematic diagram of an optimization result of a curved subsoiling shovel according to an embodiment of the present invention.
FIG. 21 is a third schematic diagram of an optimization result of a curved subsoiling shovel according to an embodiment of the present invention.
Detailed Description of the Invention
An objective of the present invention is to provide an optimization method for a subsoiling shove. Topology optimization is carried out so that the resistance to a subsoiler in the process of advancing becomes smaller. Thus, the energy efficiency of tillage is improved.
To make the above-mentioned objective, features and advantages of the present invention clearer and more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
FIG. 1 is a flowchart of a method according to an embodiment of the present invention. As shown in FIG. 1, the present invention provides an optimization method for a subsoiling, including the following steps:
Step 100: force analysis is performed on a curved subsoiling shovel to obtain a two-dimensional structural diagram, where the two-dimensional structural diagram is as shown in FIG. 2. In this embodiment, force analysis is also performed on the curved subsoiling shovel to obtain a diagram of force analysis, as shown in FIG. 3.
Step 200: two-dimensional diagram drawing and three-dimensional modeling of the curved subsoiling shovel are carried out successively according to measured 5 working parameters and actual dimensions of a subsoiler to obtain a three- dimensional model, where a front view and a side view of the three-dimensional model are as shown in FIG. 4 and FIG. 5.
Step 300: the three-dimensional model is imported to finite element analysis software for analysis to obtain an analysis result.
Step 400: set load condition, constraints and performance indicators are obtained, and topology optimization is performed on material distribution of the curved subsoiling shovel based on the analysis result to obtain an optimization result.
Specifically, in this embodiment, a frame and a soil preparation roller of the subsoiler are modeled, respectively, as shown in FIG. 6 and FIG. 7. A roller and hollow blades of the soil preparation roller are suspended behind the subsoiling shovel to perform soil crushing operation.
Further, after each component of the subsoiler is modeled, all the components are assembled through virtual assembly to obtain an assembly diagram, thereby visually showing the three-dimensional structural diagram of the subsoiler. The assembly is also carried out in UG software. Virtual assembly is carried out according to the assembly relationships of the components. The side view and the front view of the assembly diagram are as shown in FIG. 8 and FIG. 9.
Preferably, step 300 includes: performing meshing on the three-dimensional model to obtain a mesh model of the curved subsoiling shovel; obtaining a load and a boundary condition of the curved subsoiling shovel; and carrying out displacement fringe analysis and stress fringe analysis of the curved subsoiling shovel based on the mesh model, the load and the boundary condition to obtain the analysis result.
Specifically, three-dimensional modeling is carried out by using UG in this embodiment. The resulting three-dimensional diagram is imported to ANSYS for finite element simulative analysis. Topology optimization is then carried out based on the analysis result to improve the configuration of the subsoiler so that the subsoiler performs better in subsoiling operation. Since the three-dimensional modeling is carried out in the UG software, the file may be missed or cannot be opened when imported to ANSYS. Therefore, each three-dimensional diagram made in UG is converted into the format of prt for operation.
Further, with the three-dimensional structural diagram of the key part subsoiling shovel of the subsoiler, the finite element analysis in this embodiment only requires importing of the three-dimensional structural diagram to the ANSYS finite element analysis software for calculation, as shown in FIG. 10 and FIG. 11. A shovel tip and a shovel column of the subsoiling shovel are both made of 65 Mn, and the physical properties thereof are shown in Table 1.
Table 1 Physical Properties of Material of Subsoiling Shovel
Name Elasticity Poisson's Density Tensile Yield
Modulus Ratio (kg/m3) Strength Limit (GPa) (MPa) (MPa) 65Mn 210 0.288 7820 735 430
In this embodiment, the first step of the finite element analysis is to perform meshing on the three-dimensional model of the subsoiling shovel to generate elements. The meshing is performed using the ANSYS software, and the model after the meshing is as shown in FIG. 12. The mesh element quality is as shown in
FIG. 13. As can be seen from the figure, the element quality is mostly above 0.9 and all above 0.85, which meet the mesh quality requirements.
Still further, in this embodiment, the load is a force of 1800 N applied to the shovel tip and a shovel shaft of the subsoiling shovel in the working process of the subsoiling shovel. The boundary condition is that the shovel column of the subsoiling shovel is suspended and fixed behind the subsoiler which is restrained by the frame. The ANSYS software sets the boundary condition at screw hole A in
FIG. 14 to limit the degree of freedom of the shovel shaft.
Alternatively, displacement fringes in this embodiment are as shown in FIG. 15 and
FIG. 16. The maximum displacement of the subsoiling shovel is 43.997 mm, which is small and meets the requirement of this study. Stress fringes in the working process of the subsoiling shovel are as shown in FIG. 17 and FIG. 18. In an area of stress concentration surrounding a dismantling hole, the maximum stress on the subsoiling shovel in the working process is 212.56 MPa.
Each physical property of the material is compared with a simulation result, as shown in Table 2. From the comparison result, it can be seen that the maximum stress of the subsoiling shovel in the working process is 212.56 MPa and the safety factor is 2.02, which are accepted. This indicates that the strength of the subsoiling shovel in the working process meets the specified requirement and the structure design of the subsoiling shovel is reasonable. By calculating the stress and deformation of the subsoiling shovel in the working process, the maximum deformation of the curved subsoiling shovel is calculated to be 43.997 mm, while the maximum stress to be 212.56 Mpa and the safety factor to be 2.02 MPa. The strength and the stiffness meet the design requirements.
Table 2 Comparison Between Each Physical Property of Material and Simulation
Result
Name Material Maximum Yield Strength Safety Accepted
Stress (MPa) Factor or Not (MPa)
Subsoiling 65Mn shovel 212.56 430 2.02 Accepted
Optimization analysis is performed on the curved subsoiling shovel by topology optimization in this embodiment. Topology optimization is a mathematical method of optimizing material distribution in a given area based on the given load condition, constraints and performance indicators and is a kind of structure optimization. With the material distribution as the object of optimization, an optimal distribution scheme may be found in the design space with uniform material distribution by the topology optimization. Thus, the topology optimization has more degrees of design freedom than dimension optimization and shape optimization, can obtain bigger design space, and is one of the most promising aspect of structure optimization.
The optimization result of the curved subsoiling shovel is as shown in FIG. 19 to
FIG. 21. In this embodiment, it can be seen that the topology optimization can not only make the stress on the subsoiling shovel uniform but also achieve weight reduction, causing the gravity of the subsoiler in the advancing process to be reduced, as shown in Table 3. Thus, soil compaction can be alleviated, and the working efficiency can be improved. Besides, both material and power can be saved.
Table 3 Comparison between Weights of Curved Subsoiling Shovel Before and
After Optimization on Weight Reduction
Indicator Before Optimization After Optimization
Weight 25.427 kg 18 kg
An overall understanding of the internal force of the subsoiler is provided based on the finite element analysis and the topology analysis, and in combination with the external force to the subsoiler in the foregoing force analysis, a reference is provided for the overall force analysis of the subsoiler and for the study of forces on and the working stroke of the subsoiler. Meanwhile, in combination with the analysis of soil indicators, a locally appropriate subsoiling mode is screened out.
Specifically, after being determined, the optimization result is further deeply optimized by particle swarm optimization or a genetic algorithm in this embodiment.
The specific steps are as follows: determining structural features of the curved subsoiling shovel based on the optimization result; constructing an optimization function for the curved subsoiling shovel based on the structural features; determining constraints based on stress information, frequency information and boundary information of the curved subsoiling shovel; and optimizing the optimization function by particle swarm optimization based on the constraints to obtain the mass of the optimized curved subsoiling shovel.
Alternatively, the structural features include a density of the curved subsoiling shovel at each position, and structural parameters such as a curvature, a wall thickness and a height.
Relying on the three-dimensional model of the actual curved subsoiling shovel, this embodiment provides an optimization design method for a curved subsoiling shovel based on particle swarm optimization. Compared with a conventional design scheme of a curved subsoiling shovel, this optimization design method allows for effective reduction in the mass of the curved subsoiling shovel, a decrease in the overall manufacturing cost of the curved subsoiling shovel and hence promotion of the market competitiveness thereof on the basis of guaranteeing that the curved subsoiling shovel meets the requirements of safe and stable operation.
The present invention has the following beneficial effects:
In the present invention, topology optimization is carried out so that the resistance to a subsoiler in the process of advancing becomes smaller.
Thus, the energy efficiency of tillage is improved.

Claims (6)

CONCLUSIESCONCLUSIONS 1. De optimalisatiemethode voor diepe dennenschoppen, gekenmerkt doordat het omvat: het analyseren van de krachten op de gebogen schop en het verkrijgen van een tweedimensionale configuratie; het tekenen en 3D-modellering van de gebogen schop volgens de gemeten werkparameters van de diepe dennenmachine en de werkelijke afmetingen, en het verkrijgen van een 3D-model; Het 3D-model wordt voor analyse geïmporteerd in de FEA-software en de analyseresultaten worden verkregen; het verkrijgen van de ingestelde belastingsvoorwaarden, beperkingen en prestatie-indicatoren, optimaliseer de materiaalverdeling van de gebogen schop volgens de resultaten van de analyse en verkrijg de optimalisatieresultaten.1. The deep pine shovel optimization method, characterized in that it includes: analyzing the forces on the curved shovel and obtaining a two-dimensional configuration; drawing and 3D modeling of the curved shovel according to the measured working parameters of the deep pine machine and the actual dimensions, and obtaining a 3D model; The 3D model is imported into the FEA software for analysis and the analysis results are obtained; obtaining the set load conditions, constraints and performance indicators, optimize the material distribution of the curved shovel according to the results of the analysis, and obtain the optimization results. 2. De optimalisatiemethode voor diepe dennenschoppen volgens conclusie 1, met het kenmerk, dat het driedimensionale model voor analyse wordt geïmporteerd in de eindige-elementenanalysesoftware en de analyseresultaten worden verkregen, waaronder: het in elkaar grijpen van het driedimensionale model om een maasmodel van de gebogen schop te verkrijgen; het verkrijgen van de belastingen en randvoorwaarden van de gebogen schop; het uitvoeren van verplaatsingswolkanalyse en spanningswolkanalyse van de gebogen schop volgens genoemd maasmodel, genoemde belasting en genoemde randvoorwaarden, en het verkrijgen van genoemde analyseresultaten.The deep pine spade optimization method according to claim 1, characterized in that the three-dimensional model is imported into the finite element analysis software for analysis, and the analysis results are obtained, including: meshing the three-dimensional model to form a mesh model of the bent shovel to obtain; obtaining the loads and boundary conditions of the curved shovel; performing displacement cloud analysis and stress cloud analysis of the curved shovel according to said mesh model, said load and said boundary conditions, and obtaining said analysis results. 3. De optimalisatiemethode voor diepe dennenschoppen volgens conclusie 1, met het kenmerk, dat de eindige-elementenanalysesoftware ANSYS-software is.The deep pine spade optimization method according to claim 1, characterized in that the finite element analysis software is ANSYS software. 4. De optimalisatiemethode voor diepe dennenschoppen volgens conclusie 1, met het kenmerk dat de genoemde 3D-modelleringssoftware UG-software is.The deep pine shovel optimization method according to claim 1, characterized in that said 3D modeling software is UG software. 5. De optimalisatiemethode voor diepe dennenschoppen volgens conclusie 4, met het kenmerk dat het formaat van het genoemde 3D-model prt-formaat is.The deep pine shovel optimization method according to claim 4, characterized in that the format of said 3D model is prt format. 6. De optimalisatiemethode voor diepe dennenschoppen volgens conclusie 1, met het kenmerk, nadat het verkrijgen van de reeks belastingsgevallen, de beperkingen en prestatie-indicatoren, het topologisch optimaliseren van de materiaalverdeling van de gebogen diepe dennenschoppen op basis van de genoemde analyseresultaten, en het verkrijgen van optimalisatieresultaten, verder bestaande uit: Het bepalen van structurele kenmerken van de gebogen diepe dennenschoppen op basis van de genoemde optimalisatieresultaten; Het construeren van een optimalisatiefunctie voor de gebogen diepe dennenschoppen op basis van de genoemde structurele kenmerken; Het bepalen van beperkingen op basis van spanningsinformatie, frequentie- informatie en grensinformatie van de gebogen diepteschop; Het optimaliseren van de genoemde optimalisatiefunctie op basis van een deeltjeszwermalgoritme volgens de genoemde randvoorwaarden om de geoptimaliseerde massa van de gebogen diepe dennenschop te verkrijgen.The deep pine spade optimization method according to claim 1, characterized in that after obtaining the set of load cases, the constraints and performance indicators, optimizing the material distribution of the curved deep pine spades topologically based on said analysis results, and obtaining optimization results, further consisting of: Determining structural characteristics of the curved deep pine spades based on said optimization results; Constructing an optimization function for the curved deep pine spades based on the mentioned structural features; Determining limitations based on voltage information, frequency information, and boundary information of the curved depth kick; Optimizing said optimization function based on a particle swarm algorithm according to said boundary conditions to obtain the optimized mass of the curved deep pine shovel.
NL2033205A 2022-09-30 2022-09-30 Optimization method for subsoiling shovel NL2033205B1 (en)

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CN103810327A (en) * 2014-01-06 2014-05-21 西北农林科技大学 Equal-strength thinning and widening resistance reducing design method for soil subsoiling shovel handle
CN107439061A (en) * 2017-08-25 2017-12-08 东北农业大学 Matched curve moldeed depth pine spade
CN111373888A (en) * 2020-04-22 2020-07-07 沈阳工业大学 Layered deep loosening mechanism and deep loosening method thereof

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