CN110704980A - Method for manufacturing multi-scale bionic surface structure - Google Patents
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- 239000011664 nicotinic acid Substances 0.000 title claims abstract description 33
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- 239000002689 soil Substances 0.000 claims abstract description 64
- 238000003466 welding Methods 0.000 claims abstract description 10
- 239000002245 particle Substances 0.000 description 30
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- 238000010586 diagram Methods 0.000 description 4
- 241001465754 Metazoa Species 0.000 description 2
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- 230000003592 biomimetic effect Effects 0.000 description 2
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- 230000007547 defect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
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- 239000007787 solid Substances 0.000 description 2
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- 241000254173 Coleoptera Species 0.000 description 1
- 241000283966 Pholidota <mammal> Species 0.000 description 1
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Abstract
A method for manufacturing a multi-scale bionic surface structure is manufactured in a surfacing mode and comprises the following specific steps: welding a non-smooth surface of a structure with the minimum size by using a surfacing method, reserving a position for the size of a larger structure, and correcting the welded structure by using a grinding machine after surfacing; performing surfacing treatment on the contact soil part with the minimum-size structure again to weld a non-smooth surface of a secondary small-size structure, and correcting the welding structure by using the grinding machine again after surfacing to achieve the required structural shape; repeating the steps until the non-smooth surface of the maximum size structure is processed. The invention can greatly shorten the manufacturing period and obtain a very excellent bionic non-smooth resistance-reducing surface.
Description
Technical Field
The present invention is a divisional application with patent application number 201910351526.7. The invention relates to the technical field of bionic drag reduction surface structures, in particular to a method for manufacturing a multi-scale bionic surface structure.
Background
Statistics show that the friction consumes 1/3 worldwide disposable energy, reduces frictional resistance, not only can obtain remarkable economic benefit, but also can effectively save energy and resources, improve ecological environment, eliminate potential safety hazard and improve life quality.
Therefore, the researches of the scholars on the drag reduction technology are not stopped, and the application principles of three different media, namely gas, liquid and solid, on the drag reduction technology are greatly different. Drag reduction of mechanical earth-contacting parts belongs to the problem of discrete drag reduction in solids, and the development of drag reduction technology of the mechanical earth-contacting parts is limited due to the complexity of medium composition. In recent years, the rapid development of bionics provides a new idea for the drag reduction technology of mechanical earth-contacting parts, and the non-smooth surface drag reduction technology occupies a larger proportion in a plurality of bionic drag reduction technologies, and has wide application in production practice. For example, a bionic drag reduction bulldozer and a bionic plough wall are designed by researching non-smooth surfaces of the body surfaces of a large number of soil animals such as dung beetles and pangolins, and excellent drag reduction effects of the bionic drag reduction bulldozer and the bionic plough wall are verified.
However, most of the existing drag reduction technologies for bionic non-smooth surfaces rely on reverse engineering to extract the shapes of animal non-smooth surfaces, process the bionic non-smooth surfaces by applying a similar principle, and modify models through a large number of experiments. The method is time-consuming and labor-consuming, can not necessarily obtain a desired structure, is difficult to optimize the resistance reduction effect, cannot directly give the relation between the specific height and the distance of the non-smooth surface structure from the perspective of industrial design, and wastes a large amount of manpower and material resources.
Therefore, the prior art is subject to further improvement.
Disclosure of Invention
In view of the defects in the prior art, the invention aims to provide a method for manufacturing a multi-scale bionic surface structure, which overcomes the defect that how to design a multi-scale structure on a bionic non-smooth surface is not disclosed in the prior art.
A method for manufacturing a multi-scale bionic surface structure is manufactured in a surfacing mode and comprises the following specific steps:
step 1: welding a non-smooth surface of a structure with the minimum size by using a surfacing method, reserving a position for the size of a larger structure, and correcting the welded structure by using a grinding machine after surfacing until the desired effect is achieved;
step 2: performing surfacing treatment on the contact soil part with the minimum-size structure again to weld a non-smooth surface of a secondary small-size structure, and correcting the welding structure by using the grinding machine again after surfacing to achieve the required structural shape;
and step 3: repeating the steps until the non-smooth surface of the maximum size structure is processed.
A multi-scale bionic surface structure design method based on soil particle size distribution comprises the following steps:
determining the soil type according to the working environment of the mechanical soil contact part;
taking and sampling soil in the working environment of the mechanical soil contact part, and ensuring that most soil types in the working environment are covered during sampling;
thirdly, placing the soil sample in a series of sieves for sieving, wherein the sizes of the sieve pores are from large to small, the maximum sieve pore size is 4.75mm, the mesh number is 4, the minimum sieve pore size is 0.150mm, and the mesh number is 100, and sequentially placing the sieved soil in an electronic balance for weighing;
weighing the soil screened out from the minimum sieve mesh size, sampling, weighing the sample, and then putting the weighed sample into a laser particle size analyzer to measure the percentage of the particle size distribution of the sample;
combining the third step and the fourth step, combining the large-size soil particle size and the small-size soil particle size, and making an integral accumulative particle size distribution map of the measured soil;
sixthly, according to the particle size distribution diagram obtained in the step five, determining the size of the corresponding particle size distribution when the cumulative particle size distribution reaches 50%, and recording the size as the median particle size;
seventhly, repeating the third step to the sixth step, sequentially measuring the particle size distribution maps of different types of soil samples to obtain a median particle size DzTaking the median particle diameter D of all types of soil sampleszAverage value of (D)zp；
Eighthly, according to the average value D of the median diameter of the soil samplezpDetermining the height h of the bionic non-smooth surface structure, namely h ═ kD×DzpIn the formula, kDA soil particle size correction coefficient, which is determined according to the overall size of the soil contact part, working conditions and the structural form of a non-smooth surface, kDThe minimum value is 10, and the maximum value of h is not more than one tenth of the overall size L of the soil contact part;
ninthly, determining the distance S between the two structures according to the height h of the bionic non-smooth surface structure, wherein the relationship between the height h of the non-smooth surface structure and the distance S between the two structures is h-kC·S2(ii) a Wherein k isCThe correction coefficient of the size of the part is related to the size of the mechanical earth contacting part and the square v of the moving speed of the earth contacting part2Size correction coefficient k of soil contact part with same size and same speed in inverse proportionCLikewise, in particular, when the speed v is 1m/s, kCThe value range of (1) is 0.1-5, and the larger the size of the mechanical soil contact part is, the smaller the part size correction coefficient is;
when the requirement of drag reduction is higher, two-stage non-smooth surface structure can be set, the first stage surface structure is still carried out according to the step eight and the step nine, the second stage surface structure is slightly corrected according to the step eight and the step nine, wherein the overall dimension L in the step eight is changed into two first stage non-smooth surface structuresThe distance between the surface structures is marked as L ', the height h of the bionic non-smooth surface structure is changed into h ', h ' < h, and the size correction coefficient k of the soil contact partCBecome k'C，kDThe minimum value is 10, and in the ninth step, the relationship between the height h 'of the non-smooth surface structure and the spacing S' between the two structures is h '═ k'C·S′2K ' when h ' is of the same order of magnitude as h 'CAnd k isCCan take the same value, k 'when the secondary non-smooth surface structure is smaller'CThe value should be greater than kC；
Step eight to step ten can be repeated to process a third-stage structure until more stage structures are processed when a better resistance reduction effect is needed on the surface of a special mechanical soil contact part, the specific parameter selection refers to step ten, and the soil particle size correction coefficient k in step eight needs to be ensuredDThe minimum value is 10.
The invention has the beneficial effects that:
when the mechanical soil contact component interacts with soil, the physical and chemical properties of the soil determine the resistance of the mechanical soil contact component when the mechanical soil contact component contacts with the soil, and when the types of the soil are different, the resistance influence factors of the mechanical soil contact component are also different. The invention can design different bionic non-smooth surface structures according to different soil types, and theoretically demonstrates the relationship between the height of the bionic non-smooth surface structure and the distance between the two structures as well as the movement speed of a mechanical soil-contacting part. Compared with the prior art, the bionic drag reduction method has the advantages that the bionic design period can be greatly shortened, the drag reduction effect can be more optimized on the design of the bionic non-smooth drag reduction surface, and the excellent bionic non-smooth drag reduction surface is obtained.
Drawings
FIG. 1 is a schematic diagram of a primary biomimetic structure of the present invention.
FIG. 2 is a schematic diagram of a two-stage biomimetic structure according to the present invention.
FIG. 3 is a plot of the soil particle size distribution in the present invention.
FIG. 4 is a specific embodiment of the bead welding method according to the first embodiment of the present invention.
FIG. 5 shows a cutting method according to a second embodiment of the present invention.
Fig. 6 shows a third embodiment of the present invention.
Detailed Description
Referring to fig. 1 to 3, the present invention includes the following steps:
determining the soil type according to the working environment of the mechanical soil contact part;
taking and sampling soil in the working environment of the mechanical soil contact part, and ensuring that most soil types in the working environment are covered during sampling;
thirdly, placing the soil sample in a series of sieves for sieving, wherein the sizes of the sieve pores are from large to small, the maximum sieve pore size is 4.75mm, the mesh number is 4, the minimum sieve pore size is 0.150mm, and the mesh number is 100, and sequentially placing the sieved soil in an electronic balance for weighing;
weighing the soil screened out from the minimum sieve mesh size, sampling, weighing the sample, and then putting the weighed sample into a laser particle size analyzer to measure the percentage of the particle size distribution of the sample;
combining the third step and the fourth step, combining the large-size soil particle size and the small-size soil particle size, and making an integral accumulative particle size distribution map of the measured soil;
sixthly, according to the particle size distribution diagram obtained in the step five, determining the size of the corresponding particle size distribution when the cumulative particle size distribution reaches 50%, and recording the size as the median particle size;
seventhly, repeating the third step to the sixth step, sequentially measuring the particle size distribution maps of different types of soil samples to obtain a median particle size DzTaking the median particle diameter D of all types of soil sampleszAverage value of (D)zp；
Eighthly, according to the average value D of the median diameter of the soil samplezpDetermining the height h of the bionic non-smooth surface structure, namely h ═ kD×DzpIn the formula, kDA soil particle size correction coefficient, which is determined according to the overall size of the soil contact part, working conditions and the structural form of a non-smooth surface, kDThe minimum value is 10, and the maximum value of h is not more than one tenth of the overall size L of the soil contact part;
ninthly, determining the distance S between the two structures according to the height h of the bionic non-smooth surface structure, wherein the relationship between the height h of the non-smooth surface structure and the distance S between the two structures is h-kC·S2(ii) a Wherein k isCThe correction coefficient of the size of the part is related to the size of the mechanical earth contacting part and the square v of the moving speed of the earth contacting part2Size correction coefficient k of soil contact part with same size and same speed in inverse proportionCLikewise, in particular, when the speed v is 1m/s, kCThe value range of (1) is 0.1-5, and the larger the size of the mechanical soil contact part is, the smaller the part size correction coefficient is;
tenthly, when the resistance reduction requirement is higher, a two-stage non-smooth surface structure can be set, the first-stage surface structure is still carried out according to the step eight and the step nine, and the second-stage surface structure is slightly corrected according to the step eight and the step nine, wherein the overall size L in the step eight is changed into the distance between the two first-stage non-smooth surface structures and is recorded as L ', the height h of the bionic non-smooth surface structure is changed into h ', h ' < h, and the size correction coefficient k of the soil contact part is slightly correctedCBecome k'C，kDThe minimum value is 10, and in the ninth step, the relationship between the height h 'of the non-smooth surface structure and the spacing S' between the two structures is h '═ k'C·S′2K ' when h ' is of the same order of magnitude as h 'CAnd k isCCan take the same value, k 'when the secondary non-smooth surface structure is smaller'CThe value should be greater than kC；
Step eight to step ten can be repeated to process a third-stage structure until more stage structures are processed when a better resistance reduction effect is needed on the surface of a special mechanical soil contact part, the specific parameter selection refers to step ten, and the soil particle size correction coefficient k in step eight needs to be ensuredDThe minimum value is 10.
Referring to fig. 4, a first reference case provided by the present invention is a method for manufacturing a multi-scale bionic surface structure, which is manufactured by a surfacing method, and includes the following specific steps:
step 1: welding a non-smooth surface of a structure with the minimum size by using a surfacing method, reserving a position for the size of a larger structure, and correcting the welded structure by using a grinding machine after surfacing until the desired effect is achieved;
step 2: performing surfacing treatment on the contact soil part with the minimum-size structure again to weld a non-smooth surface of a secondary small-size structure, and correcting the welding structure by using the grinding machine again after surfacing to achieve the required structural shape;
and step 3: repeating the steps until the non-smooth surface of the maximum size structure is processed.
Referring to fig. 5, a second reference case provided by the present invention is a method for manufacturing a multi-scale bionic surface structure, which is manufactured by cutting, and includes the following specific steps:
step 1: processing a soil-contacting part of the machine, reserving a certain thickness, wherein the reserved thickness is the structural height of the maximum-size non-smooth surface;
step 2: cutting the mechanical soil contact part in the step 1, and reserving a certain thickness, wherein the thickness is the height of the second-stage non-smooth surface structure;
and step 3: repeating the steps, and machining the mechanical soil contact part again until the non-smooth surface of the first-grade minimum size is machined;
and 4, step 4: and (5) trimming the mechanical soil contact part after cutting processing, and removing burrs.
Referring to fig. 6, a reference case three provided by the present invention is a method for manufacturing a multi-scale bionic surface structure, which is manufactured by adopting a metal wire weaving manner, and comprises the following specific steps:
step 1: weaving a non-smooth surface of a small-size structure by using a metal wire;
step 2: embedding a metal wire to weave a non-smooth surface with a secondary small-size structure by using the non-smooth surface in the step 1;
and step 3: repeating the steps until a preset maximum non-smooth surface structure is reached;
and 4, step 4: and welding the woven non-smooth metal wire fabric or adhering the woven non-smooth metal wire fabric to the mechanical soil contact part by using metal glue to ensure that each metal wire is fixed.
Claims (1)
1. A method for manufacturing a multi-scale bionic surface structure is characterized by comprising the following steps: the method is manufactured by adopting a surfacing mode, and comprises the following specific steps:
step 1: welding a non-smooth surface of a structure with the minimum size by using a surfacing method, reserving a position for the size of a larger structure, and correcting the welded structure by using a grinding machine after surfacing;
step 2: performing surfacing treatment on the contact soil part with the minimum-size structure again to weld a non-smooth surface of a secondary small-size structure, and correcting the welding structure by using the grinding machine again after surfacing to achieve the required structural shape;
and step 3: repeating the steps until the non-smooth surface of the maximum size structure is processed.
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| CN201910948340.XA CN110704980B (en) | 2019-04-28 | 2019-04-28 | Method for manufacturing multi-scale bionic surface structure |
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| CN201910948342.9A Expired - Fee Related CN110633552B (en) | 2019-04-28 | 2019-04-28 | Method for manufacturing multi-scale bionic surface structure |
| CN201910351526.7A Expired - Fee Related CN110083943B (en) | 2019-04-28 | 2019-04-28 | multi-scale bionic drag reduction surface structure design method based on soil particle size distribution |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115805354A (en) * | 2022-11-25 | 2023-03-17 | 中国地质大学（武汉） | Surfacing lining plate with bionic structure and preparation method thereof |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN110704981A (en) | 2020-01-17 |
| CN110633552A (en) | 2019-12-31 |
| CN110704981B (en) | 2022-06-24 |
| CN110083943A (en) | 2019-08-02 |
| CN110633552B (en) | 2022-04-01 |
| CN110083943B (en) | 2019-12-13 |
| CN110704980B (en) | 2022-04-08 |
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