CN109740263A - One kind can broken grains granular discrete-element simulation model construction method - Google Patents
One kind can broken grains granular discrete-element simulation model construction method Download PDFInfo
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- CN109740263A CN109740263A CN201910011149.2A CN201910011149A CN109740263A CN 109740263 A CN109740263 A CN 109740263A CN 201910011149 A CN201910011149 A CN 201910011149A CN 109740263 A CN109740263 A CN 109740263A
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Abstract
The invention discloses one kind can broken grains granular discrete-element simulation model construction method, described method includes following steps: step 1, measure cereal-granules three-dimensional feature size；Step 2 generates cereal-granules threedimensional model using computer；Step 3 tentatively establishes cereal-granules discrete element simulation model by discrete meta software；Step 4 introduces imaginary circles cylinder bonding key in step 3 gained discrete element simulation model；Step 5, using the resulting power of Typical physical mechanical test and deformation curve as target, the rill evolution of discrete element simulation model is adjusted repeatedly, so that being matched using simulation model calculating and the obtained power of actual measurement with deformation curve, it can broken grains granular discrete-element simulation model to establish, this method considers that cereal-granules have the characteristics that can be crushed and Viscous Elastic Mechanics attribute simultaneously, keep its discrete element simulation model more close with practical cereal-granules, cereal-granules Cracking Mechanism is studied during can be widely applied to grain processing.
Description
Technical field
The present invention relates to process of grain processing technical field of value simulation, and in particular to one kind can broken grains particle it is discrete
First simulation model construction method.
Background technique
Process of grain processing is widely present the interaction between cereal-granules and between cereal-granules and process equipment, such as squeezes
Pressure, shearing, impact etc..However, cereal-granules can be more than that its own limit is strong because of suffered external load in interaction process
It spends and is crushed.For corn quarrel is produced, wheat flour is produced etc. cereal processing, cereal-granules are broken to be will be helpful to improve it
The effect of eating mouth feel improves human body to the absorbability of its nutritional ingredient, plays functional component in cereal to the maximum extent, mentions
High cereal added value.On the contrary, cereal-granules are broken to will lead to it for paddy husk rice, sorghum rice such as produce at the cereal processing
Edible quality and economic value reduce.Obviously, whether no matter cereal-granules broken is expected to, but from meso-scale it is apparent its
On the one hand Cracking Mechanism is the effective way for fundamentally solving cereal Crushing Problem, be on the other hand to realize to control paddy on demand
Object increases broken effective ways.
In recent years with the continuous development of computer and numerical simulation, Virtual Simulation is obtained in cereal manufacture field
Relatively broadly apply.However, traditional virtual l-G simulation test is usually using cereal-granules as the isotropic pure bullet of homogeneous
Property body consider, and only simulate its dynamic motion behavior in corresponding process, but fail to reappear generally there is viscoplasticity
The Fragmentation Phenomena of the cereal-granules of mechanical attribute, leading to virtual simulation test and practical cereal processing experiment, there are certain deviations.
The invention patent provides a kind of new method of cereal-granules discrete element Building of Simulation Model, is substantially reducing test
Workload and cost on the basis of greatly shortening research cycle, can really simulation cereal-granules be crushed, be easily analyzed it
Cracking Mechanism in process provides efficient approaches and methods for the design and test of crop-processing equipment.With regard to oneself warp
From the point of view of the document and Patent data of grasp, from consider Viscous Elastic Mechanics attribute angle to can broken grains granular discrete-element emulate
There is not been reported for the foundation of model.
Summary of the invention
Goal of the invention, the present invention provide one kind can broken grains granular discrete-element simulation model construction method, breach paddy
The difficult point that virtual cereal-granules model can not be crushed in object process discrete element simulation, this method consider true cereal simultaneously
Viscous Elastic Mechanics attribute possessed by particle, the cereal-granules for obtaining its modeling are more close with practical cereal-granules.
The technical solution adopted by the present invention is that: one kind can broken grains granular discrete-element simulation model construction method, it is special
Sign is that modeling procedure is as follows:
Step 1, based on the measurement to practical cereal-granules characteristic size, obtain the initial ruler of solid of approximate cereal-granules
It is very little；
Step 2, the cereal-granules original dimension obtained based on step 1 generate approximate cereal in CAD design software
The threedimensional model of particle geometry；
Step 3, the cereal-granules threedimensional model obtained based on step 2, utilize elementary particle in discrete meta software
Threedimensional model is filled, the initial discrete member simulation model of cereal-granules is established；
It is viscous to introduce imaginary circles cylinder wherein for step 4, the initial simulation model of the cereal-granules obtained based on step 3
Tie key, the first broken grains granular discrete-element simulation model that begins of building；
Step 5 measures the obtained power of cereal-granules and deformation curve using Typical physical mechanical test as target, adjusts base
In the rill evolution for the broken grains granular discrete-element simulation model that just begins that step 4 obtains, so that imitative using discrete element
The power and deformation curve that power that true mode is calculated and deformation curve and actual measurement obtain match, to obtain to be crushed
Cereal-granules discrete element simulation model.
Compared with prior art, the beneficial effects of the present invention are:
The present invention bonds the close of key building compared to traditional cereal-granules discrete element modeling method, by imaginary circles cylinder
Like the condensate of cereal-granules, make established cereal-granules discrete element simulation model that can meet cereal during grain processing
The needs of grain Cracking Mechanism research.
Because considering the spy of its had Viscous Elastic Mechanics attribute simultaneously in cereal-granules discrete element modeling method of the present invention
Point, therefore the stress condition of true cereal-granules more can be accurately reacted, make established cereal-granules discrete element simulation model more
The closely true cereal-granules of adjunction.
Detailed description of the invention
Fig. 1 is the step flow chart of modeling method；
Fig. 2 is the particle-filled spheroid space of substantially spherical；
Fig. 3 is the particle-filled spheroid aerial cross sectional figure of substantially spherical；
Fig. 4 is introducing imaginary circles cylinder bonding key between substantially spherical particle；
Fig. 5 is imaginary circles cylinder bonding key introducing sectional view between substantially spherical particle；
Fig. 6 is power under brown rice seed uniaxial compression test and deformation curve and the lower power of simulation numerical test and deforms song
The comparison diagram of line.
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with can be crushed brown rice seed from
The specific example of member simulation model building is dissipated, and referring to attached drawing, the present invention is described in further detail.
Fig. 1 be it is of the invention it is a kind of can broken grains granular discrete-element simulation model construction method flow chart.Example is rough
Rice variety adoption east agriculture 429, example discrete element simulation software selects EDEM.According to flow chart shown in FIG. 1, as exemplary one
Kind can be crushed the building of brown rice seed discrete element simulation model the following steps are included:
(1) by moisture content be 15.6% brown rice sample in 200 brown rice seeds measure respectively its long L, width W,
Tri- direction feature dimensions of thick D；The spheroid original dimension of approximate brown rice seed is calculated using following formula:
In formula, DLFor the ellipsoid long axis of body of approximate brown rice seed, value 6.8mm；DSFor the spheroid of approximate brown rice seed
Short axle, value 2.4mm；NGFor measured brown rice seed quantity.
(2) the spheroid original dimension based on previous step approximate brown rice seed obtained, utilizes 3 d modeling software
Solidworks establishes the ellipsoid body three-dimensional models of approximate brown rice seed, due to needing the spheroid of pairing approximation brown rice seed to be filled out
It fills, also needs aggregate tube.The IGS formatted file of constructed threedimensional model is imported in discrete meta software EDEM.Due to by brown rice
Seed is considered as the two phase material as composed by epidermis chaff layer and internal endosperm, therefore spheroid space is divided into inside and outside two layers, and point
Substantially spherical the particle A and B that filling meets single particle size not in two layers are used to characterize epidermis chaff layer and internal endosperm,
As shown in Figures 2 and 3；Relationship between the quantity of substantially spherical particle and corresponding filling rate can be according to following formula:
In formula, α is the particle-filled degree of substantially spherical, value 0.56；VTFor the volume in spheroid space, value
25.246mm3；NAFor the quantity of substantially spherical particle A, value 1750；NBFor the quantity of substantially spherical particle B, value 546；RA
For the radius of substantially spherical particle A, value 0.09mm；RBFor the radius of substantially spherical particle B, value 0.16mm.
(3) imaginary circles cylinder is introduced in the brown rice seed discrete element simulation model by substantially spherical particle institute Primary Construction
Key is bonded, as shown in Figures 4 and 5；The mechanical model that substantially spherical particle uses meets by contact adhesive model and Maxwell simultaneously
Coupling mechanics model composed by viscoelastic model, the calculating of contact stress is as follows in above-mentioned coupling mechanics model:
In formula,For the normal direction cohesive force of t+ Δ t time step；For the normal direction cohesive force of t time step；
The tangential cohesive force of time step is calculated for t+ Δ t；For the tangential cohesive force of t time step；Kn,bRigidity is bonded for normal direction；Ks,b
Tangentially to bond rigidity；LbKey length is bonded for imaginary circles cylinder；AbThe cross-sectional area of key is bonded for imaginary circles cylinder；
The normal direction relative velocity between substantially spherical particle；The circumferentially opposite speed between substantially spherical particle；η is viscosity.
(4) according to the discrete element simulation model tentatively established, the discrete element emulation of brown rice seed uniaxial compression test is carried out
Test.By keeping physical parameter and exposure parameter constant in discrete meta software EDEM, and adjust in rill evolution repeatedly
Parameter is bonded, so that l-G simulation test power obtained and deformation curve, the power obtained with uniaxial compression test measurement and deformation are bent
Line matches, and sees Fig. 6.The rill evolution of brown rice seed discrete element simulation model obtained, is detailed in following table after adjusting repeatedly
1.So far, model foundation finishes, and realizes the building that can be crushed brown rice seed discrete element simulation model.
1 brown rice particle of table tests rill evolution
The above, only one of embodiment of the present invention, but scope of protection of the present invention is not limited thereto, it is any ripe
Know those skilled in the art in the technical scope disclosed by the present invention, according to the technique and scheme of the present invention its inventive concept
It is subject to equivalent substitution or change, should be covered by the protection scope of the present invention.
Claims (6)
1. one kind can broken grains granular discrete-element simulation model construction method, it is characterised in that including the following contents:
Step 1, based on the measurement to true cereal-granules characteristic size, obtain the original dimension of approximate cereal-granules solid；
Step 2, the cereal-granules original dimension obtained based on step 1 generate approximate cereal-granules in CAD design software
The threedimensional model of solid；
Step 3, the cereal-granules threedimensional model obtained based on step 2, using elementary particle to three in discrete meta software
Dimension module is filled, and establishes the initial discrete member simulation model of cereal-granules；
Step 4, the cereal-granules initial discrete member simulation model obtained based on step 3 are introduced virtual between elementary particle
Cylindrical body bonds key, the first broken grains granular discrete-element simulation model that begins of building；
Step 5 measures the obtained power of cereal-granules and deformation curve using Typical physical mechanical test as target, and adjustment is based on step
The rill evolution of the rapid 4 initial discrete member simulation models obtained so that the power being calculated using numerical simulation model with
Deformation curve matches with the power that actual measurement obtains with deformation curve, so that obtaining can broken grains granular discrete-element emulation mould
Type.
2. one kind according to claim 1 can broken grains granular discrete-element simulation model construction method, it is characterised in that:
Establish can cereal-granules discrete element simulation model when, cereal-granules are considered as to the two-phase being made of epidermis chaff layer and internal endosperm
Material, and in its solid space fill two kinds of different particle size distributions elementary particle, for its constituent carry out table
Sign, and meet following relationship between corresponding compactedness and elementary particle quantity:
In formula, α is elementary particle compactedness, VTFor the volume in spheroid space, NPFor the partial size type of elementary particle, NVFor base
This particle kind, Ni,jFor the number of jth class partial size in i-th kind of elementary particle, Vi,jFor jth class partial size in i-th kind of elementary particle
Volume.
3. one kind according to claim 2 can broken grains granular discrete-element simulation model construction method, it is characterised in that:
In step 3, the particle diameter distribution of the elementary particle can be any one in single particle size distribution, normal distribution and bimodal distribution
Kind.
4. one kind according to claim 1 can broken grains granular discrete-element simulation model construction method, it is characterised in that:
In step 4, the mechanical model between the elementary particle of the bonding key connection is all made of is glued by contact adhesive model and Maxwell
Coupling mechanics model composed by elastic model.
5. one kind according to claim 1 can broken grains granular discrete-element simulation model construction method, it is characterised in that:
In steps of 5, Typical physical mechanical test can be any one in uniaxial compression test, three point bending test.
6. one kind according to claim 4 can broken grains granular discrete-element simulation model construction method, it is characterised in that:
In steps of 5, the rill evolution in coupling mechanics model for characterizing cereal-granules discrete element simulation model mechanical behavior includes
Physical parameter (Poisson's ratio, modulus of shearing, density), exposure parameter (recovery coefficient, confficient of static friction, coefficient of rolling friction) and
It bonds parameter (unit area normal direction and shear stiffness, critical normal direction and tangential intensity, viscosity).
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| CN110414139A (en) * | 2019-07-29 | 2019-11-05 | 湘潭大学 | One kind being used for the hot worked emulated computation method of roller endoparticle shape nut |
| CN110705067A (en) * | 2019-09-23 | 2020-01-17 | 湘潭大学 | Method for generating three-axis sample of breakable particles considering complex random shape |
| CN111125920A (en) * | 2019-12-26 | 2020-05-08 | 湘潭大学 | Particle crushing strength determination method based on Monte Carlo simulation |
| CN112052587A (en) * | 2020-09-02 | 2020-12-08 | 中国人民解放军陆军工程大学 | Three-dimensional microscopic discrete body model compacting method for sandy soil cushion |
| CN112613085A (en) * | 2020-12-25 | 2021-04-06 | 洛阳智能农业装备研究院有限公司 | Grain material discrete element simulation model construction method |
| CN113390735A (en) * | 2021-06-25 | 2021-09-14 | 东北农业大学 | Prediction method for grain breakage probability under single impact load |
| CN113821926A (en) * | 2021-09-18 | 2021-12-21 | 塔里木大学 | Discrete element numerical simulation method for nut shell crushing |
| CN114444367A (en) * | 2022-01-26 | 2022-05-06 | 中国人民解放军63653部队 | Discrete element parameter automatic calibration method for dry sand dynamic simulation |
| CN114757072A (en) * | 2022-04-13 | 2022-07-15 | 华中农业大学 | Grain humidification uniformity quantitative detection method and system in spray tempering process |
| CN116705200A (en) * | 2023-04-27 | 2023-09-05 | 安徽理工大学 | Fusion reactor pebble bed particle material crushing simulation calculation method based on fractal theory |
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| CN110414139B (en) * | 2019-07-29 | 2022-11-18 | 湘潭大学 | Simulation calculation method for thermal processing of granular nuts in roller |
| CN110414139A (en) * | 2019-07-29 | 2019-11-05 | 湘潭大学 | One kind being used for the hot worked emulated computation method of roller endoparticle shape nut |
| CN110705067A (en) * | 2019-09-23 | 2020-01-17 | 湘潭大学 | Method for generating three-axis sample of breakable particles considering complex random shape |
| CN111125920A (en) * | 2019-12-26 | 2020-05-08 | 湘潭大学 | Particle crushing strength determination method based on Monte Carlo simulation |
| CN112052587A (en) * | 2020-09-02 | 2020-12-08 | 中国人民解放军陆军工程大学 | Three-dimensional microscopic discrete body model compacting method for sandy soil cushion |
| CN112052587B (en) * | 2020-09-02 | 2023-12-01 | 中国人民解放军陆军工程大学 | Compaction method of three-dimensional microscopic discrete body model of sand cushion |
| CN112613085A (en) * | 2020-12-25 | 2021-04-06 | 洛阳智能农业装备研究院有限公司 | Grain material discrete element simulation model construction method |
| CN113390735A (en) * | 2021-06-25 | 2021-09-14 | 东北农业大学 | Prediction method for grain breakage probability under single impact load |
| CN113821926B (en) * | 2021-09-18 | 2024-01-26 | 塔里木大学 | Discrete element numerical simulation method for crushing nut shells |
| CN113821926A (en) * | 2021-09-18 | 2021-12-21 | 塔里木大学 | Discrete element numerical simulation method for nut shell crushing |
| CN114444367A (en) * | 2022-01-26 | 2022-05-06 | 中国人民解放军63653部队 | Discrete element parameter automatic calibration method for dry sand dynamic simulation |
| CN114444367B (en) * | 2022-01-26 | 2024-05-28 | 中国人民解放军63653部队 | Discrete element parameter automatic calibration method for dry sand dynamics simulation |
| CN114757072A (en) * | 2022-04-13 | 2022-07-15 | 华中农业大学 | Grain humidification uniformity quantitative detection method and system in spray tempering process |
| CN114757072B (en) * | 2022-04-13 | 2024-04-12 | 华中农业大学 | Quantitative detection method and system for grain humidification uniformity in spray tempering process |
| CN116705200A (en) * | 2023-04-27 | 2023-09-05 | 安徽理工大学 | Fusion reactor pebble bed particle material crushing simulation calculation method based on fractal theory |
| CN116705200B (en) * | 2023-04-27 | 2024-05-03 | 安徽理工大学 | Fusion reactor pebble bed particle material crushing simulation calculation method based on fractal theory |
| CN117556486A (en) * | 2024-01-08 | 2024-02-13 | 吉林大学 | Modeling method for crushable corncob |
| CN117556486B (en) * | 2024-01-08 | 2024-03-26 | 吉林大学 | Modeling method for crushable corncob |
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