CN109632558A - A kind of software maggot material parameter acquiring method based on discrete element - Google Patents
A kind of software maggot material parameter acquiring method based on discrete element Download PDFInfo
- Publication number
- CN109632558A CN109632558A CN201811261974.XA CN201811261974A CN109632558A CN 109632558 A CN109632558 A CN 109632558A CN 201811261974 A CN201811261974 A CN 201811261974A CN 109632558 A CN109632558 A CN 109632558A
- Authority
- CN
- China
- Prior art keywords
- fly maggot
- culture medium
- maggot
- medium particle
- software
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000000463 material Substances 0.000 title claims abstract description 52
- 238000000034 method Methods 0.000 title claims abstract description 36
- 238000011439 discrete element method Methods 0.000 claims abstract description 15
- 238000004458 analytical method Methods 0.000 claims abstract description 14
- 239000000203 mixture Substances 0.000 claims abstract description 8
- 239000002245 particle Substances 0.000 claims description 76
- 239000001963 growth medium Substances 0.000 claims description 75
- 238000010008 shearing Methods 0.000 claims description 30
- 229910000831 Steel Inorganic materials 0.000 claims description 21
- 239000010959 steel Substances 0.000 claims description 21
- 238000005096 rolling process Methods 0.000 claims description 18
- 238000012360 testing method Methods 0.000 claims description 16
- 238000011084 recovery Methods 0.000 claims description 15
- 238000005259 measurement Methods 0.000 claims description 13
- 230000003068 static effect Effects 0.000 claims description 11
- 229920000936 Agarose Polymers 0.000 claims description 9
- 238000004364 calculation method Methods 0.000 claims description 6
- 238000003384 imaging method Methods 0.000 claims description 6
- 239000000523 sample Substances 0.000 claims description 6
- 230000006641 stabilisation Effects 0.000 claims description 6
- 238000011105 stabilization Methods 0.000 claims description 6
- 238000010998 test method Methods 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 238000005303 weighing Methods 0.000 claims description 6
- 230000003321 amplification Effects 0.000 claims description 5
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 5
- 238000004088 simulation Methods 0.000 claims description 4
- 241000208340 Araliaceae Species 0.000 claims description 3
- 206010006100 Bradykinesia Diseases 0.000 claims description 3
- 102100021807 ER degradation-enhancing alpha-mannosidase-like protein 1 Human genes 0.000 claims description 3
- 208000006083 Hypokinesia Diseases 0.000 claims description 3
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 claims description 3
- 235000003140 Panax quinquefolius Nutrition 0.000 claims description 3
- 230000001133 acceleration Effects 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 3
- 238000013016 damping Methods 0.000 claims description 3
- 235000008434 ginseng Nutrition 0.000 claims description 3
- 230000012447 hatching Effects 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 238000009863 impact test Methods 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 3
- 230000000644 propagated effect Effects 0.000 claims description 3
- 230000005855 radiation Effects 0.000 claims description 3
- 238000013334 tissue model Methods 0.000 claims description 3
- 230000007613 environmental effect Effects 0.000 claims 1
- 238000000926 separation method Methods 0.000 abstract description 5
- 238000011160 research Methods 0.000 abstract description 4
- 238000013461 design Methods 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 abstract description 3
- 239000002361 compost Substances 0.000 abstract description 2
- 239000008187 granular material Substances 0.000 abstract description 2
- 238000012216 screening Methods 0.000 description 2
- 239000012773 agricultural material Substances 0.000 description 1
- 210000003608 fece Anatomy 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 102000004169 proteins and genes Human genes 0.000 description 1
- 108090000623 proteins and genes Proteins 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N5/00—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid
- G01N5/04—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by removing a component, e.g. by evaporation, and weighing the remainder
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01K—ANIMAL HUSBANDRY; AVICULTURE; APICULTURE; PISCICULTURE; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
- A01K67/00—Rearing or breeding animals, not otherwise provided for; New or modified breeds of animals
- A01K67/033—Rearing or breeding invertebrates; New breeds of invertebrates
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N19/00—Investigating materials by mechanical methods
- G01N19/02—Measuring coefficient of friction between materials
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/60—Analysis of geometric attributes
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/023—Solids
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/06—Power analysis or power optimisation
Landscapes
- Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Pathology (AREA)
- Immunology (AREA)
- General Health & Medical Sciences (AREA)
- Biochemistry (AREA)
- Analytical Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Theoretical Computer Science (AREA)
- Environmental Sciences (AREA)
- Geometry (AREA)
- Computer Hardware Design (AREA)
- Acoustics & Sound (AREA)
- Automation & Control Theory (AREA)
- Measuring Or Testing Involving Enzymes Or Micro-Organisms (AREA)
- General Engineering & Computer Science (AREA)
- Evolutionary Computation (AREA)
- Animal Husbandry (AREA)
- Zoology (AREA)
- Computer Vision & Pattern Recognition (AREA)
- Biodiversity & Conservation Biology (AREA)
- Dispersion Chemistry (AREA)
- Animal Behavior & Ethology (AREA)
Abstract
The present invention is in view of the problems of the existing technology; provide a kind of required gain of parameter method when software maggot material model emulation analysis based on distinct element method; this method can carry out granular model analysis for software fly maggot and compost granulate mixture with distinct element method and establish high granular software granular model; design for maggot material separation vibrating sieve provides key parameter, to the research significance using vibrosieve from maggot material mixture with reality.
Description
Technical field
The present invention relates to agricultural material screening field more particularly to a kind of mechanics for during material screening point
Analysis.
Background technique
Distinct element method has been widely used for the motion analysis of rigid elements discrete bodies, passes through careful simulation various discrete list
Its mechanics problem in contact process is analyzed in the interaction of first body.Maggot material is theoretically handled using distinct element method at present
Separation by vibration Problem Technical is rarely reported, none completely analyzes the theory of maggot material particle mechanics problem during the separation process
System.A kind of maggot material model emulation analysis method based on distinct element method of the invention, can make up non-rigid bodies or software
The blank of mechanical analysis theoretical basis of particle during discrete element particle Separation by vibration.
Summary of the invention
In view of the problems of the existing technology the present invention, provides a kind of software maggot material parameter acquisition side based on discrete element
Method, this method can carry out granular model analysis for software fly maggot and compost granulate mixture with distinct element method and build
Vertical high granular software granular model, the design for maggot material separation vibrating sieve provide key parameter, to utilization vibrosieve from maggot
Expect that mixture has the research significance of reality.
The technology of the present invention realization is realized by following scheme: a kind of software maggot material parameter acquisition side based on discrete element
Method, including material property gain of parameter and granular model establish two parts；Wherein material property parameter, that is, material intrinsic parameters,
The basic exposure parameter of material and contact model parameter；Material intrinsic parameters include Poisson's ratio, modulus of shearing and density；Material
Parameter includes collision recovery coefficient, coefficient of rolling friction and confficient of static friction；Contact model parameter is modelling；Wherein particle
Model selects soft agarose culture, including following steps.
A kind of software maggot material parameter acquiring method based on discrete element, wherein material property gain of parameter, including it is following several
A step.
Step A) material intrinsic parameters include Poisson's ratio, modulus of shearing and density, experimental enviroment condition is set first, i.e.,
The condition of experimental enviroment is set as 20 DEG C -30 DEG C of room temperature, humidity is between 50%-60%；
Poisson's ratio obtains: being directed to software fly maggot special test object, using digital image method, simultaneously by non-contact type test method
And digital picture speckle method is combined, real-time monitoring measures the exact numerical of Poisson's ratio；
Modulus of shearing obtains: initially setting up the simulated tissue model for software fly maggot, obtains fly maggot according to shearing wave imaging method
Shearing wave image, using the shearing wave propagated in the biological tissue of ultrasonic probe tracking fly maggot, then pass through acoustic radiation force pulse
Imaging technique generates the shearing wave of fly maggot tissue, and the time series of shearing wave image is captured by ultrasonic probe, finally utilizes
The calculating of the shearing wave propagation of foundation simultaneously passes through the modulus of shearing that computer exports fly maggot；
Density obtains: regard fly maggot and culture medium particle simulation as sphere, first whole weighing, measures maggot material mixture gross mass M,
Fly maggot particle is picked out manually, is re-weighed, fly maggot gross mass m is measured, fly maggot quantity is n, then the gross mass of culture medium particle is
(M-m), setting high-speed image acquisition system and setting shooting speed is 800~1000 frames/s, will be singled out carrying out fly maggot measuring
Size acquires the average value R of fly maggot volume radius, then can be acquired according to density formula according to normal distribution；By culture medium
Particle approximation also regards sphere model as, sets the multiple of camera, the photo of culture medium particle is shot, further according to the amplification of camera
Multiple calculates the radius distance value of culture medium particle, according to normal distribution, acquires the radius average value r of culture medium particle, equally
The density of culture medium particle is calculated。
Step B) the basic exposure parameter of material includes collision recovery coefficient and coefficient of rolling friction and confficient of static friction；
Collision recovery coefficient obtains: it is big to measure the extreme forces of fly maggot and culture medium particle before rupture first with Texture instrument
It is small, freely falling body impact test is recycled, high-speed image acquisition system is cooperated, sets the shooting speed of high-speed image acquisition system
Degree is 800~1200 frames/second, according to the calculation formula of the object movement of falling object and the defined formula of recovery coefficient, is calculated
The numerical values recited of the collision recovery coefficient of fly maggot and culture medium particle out；
Coefficient of rolling friction obtains: fly maggot and culture medium particle being installed with cubic container, and carried out at cooling to fly maggot
Reason, by temperature control within the scope of 5 DEG C~10 DEG C, the mobility of fly maggot is small at this time and bradykinesia, will be formed build rapidly
The fly maggot and culture medium particle of block are placed on smooth steel plate side center by edge, slowly lift and place fly maggot and culture medium
That side smooth steel plate of particle building block records test process with high-speed camera until building block slowly has the tendency that slide downward,
And the moment with tendency toward sliding is recorded, the angle of smooth steel plate and horizontal plane is recorded using the method for measurement, then fly
The coefficient of rolling friction of maggot is；It similarly utilizes and is horizontally arranged smooth steel plate on the ground, culture medium particle is used
Fixed container is fixed as smooth steel plate side center is placed on after building block by edge, and slowly lifting placement culture medium can build
That side smooth steel plate of block records test process with high-speed camera, and remember until building block slowly has the tendency that slide downward
The record lower moment with tendency toward sliding, the angle of smooth steel plate and horizontal plane is recorded using the method for measurement, then coefficient of friction
ForThe then coefficient of rolling friction of culture medium；
Confficient of static friction obtains: the numerical value that the coefficient of rolling friction of fly maggot and culture medium particle that test obtains is measured is multiplied by fortune
Dynamic coefficient, the numerical value obtained at this time is denoted as to the confficient of static friction of fly maggot and culture medium particle respectively.
Step C) contact model gain of parameter:
A kind of maggot material model emulation analysis method based on distinct element method, wherein granular model is established；The following steps are included:
Granular model is established: being set fly maggot and culture medium particle as soft agarose culture, and by its collision model and is set as spring damping
Oscillator system sets its spring constant k, the parameter values such as damped coefficient c；
Using distinct element method using fly maggot and culture medium particle as the sphere of several discrete units, the soft ball of setting contacts mould
Type acquires normal force and tangential force between contact model, fly maggot and culture medium particle further according to the calculation formula of soft agarose culture power
Resultant force and resultant moment between sieve, then the acceleration of fly maggot and culture medium particle is acquired, mathematical knowledge is recycled, integral is asked
The speed and shift value for obtaining fly maggot and culture medium particle obtain the related ginseng between fly maggot and culture medium particle by solving
Number numerical value.Fly maggot 1600 of same batch same hatching age are taken at random, are taken 16 clean culture dishes, are put down in each culture dish
100 pipunculid maggots are placed, three containers are taken, proper amount of clear water is added, the fly maggot in each culture dish is put into container and cleans three
It is secondary, the moisture on fly maggot surface is finally blotted with paper handkerchief；Then the power supply for opening electronic analytical balance carries out zero calibration, then will
The culture dish of clean dried, which is placed on electronic balance, carries out weighing peeling, takes out the culture dish, by 100 pipunculids of suck dry moisture
Maggot is gently placed in culture dish, then culture dish is placed on electronic balance, after data stabilization to be shown is constant, records
The quality of 100 pipunculid maggots at this time, remaining 15 parts also repeat above-mentioned test procedure, record the quality of 15 parts of fly maggots；Arbitrarily take
100 pipunculid maggots out in a culture dish are to be measured, open the power supply of brilliant wave HH-S2 digital display thermostat water bath, set heating temperature
It is 80 DEG C, when the temperature that water-bath is shown reaches 80 DEG C, then hangs on, waits 80 DEG C of data stabilizations of displays constant, it will be random
The 100 pipunculid maggots taken out are placed in clean container, and container is placed in water-bath, a few minutes are spent, to 100 in container
Fly maggot is all dead, takes out container rapidly, shakes gently container, so that the fly maggot in container is not bonded to together, opens computer
On Scopephoto image measurement processing software, open simultaneously stereomicroscope power supply, scaling board be selected as black calibration
Plate takes out 1 dead fly maggot, places it in clean culture dish, puts smooth, adjusting stereomicroscope as far as possible
Amplification factor, until fly maggot is high-visible in Scopephoto software, then needs are measured by the measuring tool of software
Fly maggot size.According to the data of test measurement, according to normal distribution characteristic, different fly maggots and culture medium particle size are set
The fly maggot of foundation and culture medium particle three-dimensional model are imported the analysis of EDEM software by quantity.
The utility model has the advantages that
1. a kind of software maggot material parameter acquiring method based on discrete element of the invention is supported for currently with solid animal dung
It grows fly maggot and obtains the isolation technics problem that the Novel cultivation industry of high protein bait faces, solve vibrating screen needs in structure design
Consider that the key parameter for separating maggot material mixture obtains problem；
2. it is empty to solve software fly maggot physical parameter to a kind of software maggot material parameter acquiring method based on discrete element of the invention
White problem compensates for non-rigid bodies and software organism in the technological gap in DEM analysis field；
3. a kind of software maggot material parameter acquiring method based on discrete element of the invention, for the software biology point of similar fly maggot body
From research direction is specified, there is the research directive significance of reality.
Specific embodiment
The course of work of the invention is as follows:
A kind of software maggot material parameter acquiring method based on discrete element, including material property gain of parameter and granular model establish two
A part；Wherein material property parameter, that is, material intrinsic parameters, the basic exposure parameter of material and contact model parameter；Material is intrinsic
Parameter includes Poisson's ratio, modulus of shearing and density；Material parameter includes collision recovery coefficient, coefficient of rolling friction and quiet rubs
Wipe coefficient；Contact model parameter is modelling；Wherein granular model selects soft agarose culture, including the following steps:
A kind of software maggot material parameter acquiring method based on discrete element, wherein material property gain of parameter, including following step
Suddenly.
Step A) material intrinsic parameters include Poisson's ratio, modulus of shearing and density, experimental enviroment condition is set first, i.e.,
The condition of experimental enviroment is set as 20 DEG C -30 DEG C of room temperature, humidity is between 50%-60%；
Poisson's ratio obtains: being directed to software fly maggot special test object, using digital image method, simultaneously by non-contact type test method
And digital picture speckle method is combined, real-time monitoring measures the exact numerical of Poisson's ratio；
Modulus of shearing obtains: initially setting up the simulated tissue model for software fly maggot, obtains fly maggot according to shearing wave imaging method
Shearing wave image, using the shearing wave propagated in the biological tissue of ultrasonic probe tracking fly maggot, then pass through acoustic radiation force pulse
Imaging technique generates the shearing wave of fly maggot tissue, and the time series of shearing wave image is captured by ultrasonic probe, finally utilizes
The calculating of the shearing wave propagation of foundation simultaneously passes through the modulus of shearing that computer exports fly maggot；
Density obtains: regard fly maggot and culture medium particle simulation as sphere, first whole weighing, measures maggot material mixture gross mass M,
Fly maggot particle is picked out manually, is re-weighed, fly maggot gross mass m is measured, fly maggot quantity is n, then the gross mass of culture medium particle is
(M-m), setting high-speed image acquisition system and setting shooting speed is 800~1000 frames/s, will be singled out carrying out fly maggot measuring
Size acquires the average value R of fly maggot volume radius, then can be acquired according to density formula according to normal distribution；By culture medium
Particle approximation also regards sphere model as, sets the multiple of camera, the photo of culture medium particle is shot, further according to the amplification of camera
Multiple calculates the radius distance value of culture medium particle, according to normal distribution, acquires the radius average value r of culture medium particle, equally
The density of culture medium particle is calculated。
Step B) the basic exposure parameter of material includes collision recovery coefficient and coefficient of rolling friction and confficient of static friction；
Collision recovery coefficient obtains: it is big to measure the extreme forces of fly maggot and culture medium particle before rupture first with Texture instrument
It is small, freely falling body impact test is recycled, high-speed image acquisition system is cooperated, sets the shooting speed of high-speed image acquisition system
Degree is 800~1200 frames/second, according to the calculation formula of the object movement of falling object and the defined formula of recovery coefficient, is calculated
The numerical values recited of the collision recovery coefficient of fly maggot and culture medium particle out；
Coefficient of rolling friction obtains: fly maggot and culture medium particle being installed with cubic container, and carried out at cooling to fly maggot
Reason, by temperature control within the scope of 5 DEG C~10 DEG C, the mobility of fly maggot is small at this time and bradykinesia, will be formed build rapidly
The fly maggot and culture medium particle of block are placed on smooth steel plate side center by edge, slowly lift and place fly maggot and culture medium
That side smooth steel plate of particle building block records test process with high-speed camera until building block slowly has the tendency that slide downward,
And the moment with tendency toward sliding is recorded, the angle of smooth steel plate and horizontal plane is recorded using the method for measurement, then fly
The coefficient of rolling friction of maggot is；It similarly utilizes and is horizontally arranged smooth steel plate on the ground, culture medium particle is used
Fixed container is fixed as smooth steel plate side center is placed on after building block by edge, and slowly lifting placement culture medium can build
That side smooth steel plate of block records test process with high-speed camera, and remember until building block slowly has the tendency that slide downward
The record lower moment with tendency toward sliding, the angle of smooth steel plate and horizontal plane is recorded using the method for measurement, then coefficient of friction
ForThe then coefficient of rolling friction of culture medium；
Confficient of static friction obtains: the numerical value that the coefficient of rolling friction of fly maggot and culture medium particle that test obtains is measured is multiplied by fortune
Dynamic coefficient, the numerical value obtained at this time is denoted as to the confficient of static friction of fly maggot and culture medium particle respectively.
Step C) contact model gain of parameter:
A kind of maggot material model emulation analysis method based on distinct element method, wherein granular model is established；The following steps are included:
Granular model is established: being set fly maggot and culture medium particle as soft agarose culture, and by its collision model and is set as spring damping
Oscillator system sets its spring constant k, the parameter values such as damped coefficient c；
Using distinct element method using fly maggot and culture medium particle as the sphere of several discrete units, the soft ball of setting contacts mould
Type acquires normal force and tangential force between contact model, fly maggot and culture medium particle further according to the calculation formula of soft agarose culture power
Resultant force and resultant moment between sieve, then the acceleration of fly maggot and culture medium particle is acquired, mathematical knowledge is recycled, integral is asked
The speed and shift value for obtaining fly maggot and culture medium particle obtain the related ginseng between fly maggot and culture medium particle by solving
Number numerical value.Fly maggot 1600 of same batch same hatching age are taken at random, are taken 16 clean culture dishes, are put down in each culture dish
100 pipunculid maggots are placed, three containers are taken, proper amount of clear water is added, the fly maggot in each culture dish is put into container and cleans three
It is secondary, the moisture on fly maggot surface is finally blotted with paper handkerchief；Then the power supply for opening electronic analytical balance carries out zero calibration, then will
The culture dish of clean dried, which is placed on electronic balance, carries out weighing peeling, takes out the culture dish, by 100 pipunculids of suck dry moisture
Maggot is gently placed in culture dish, then culture dish is placed on electronic balance, after data stabilization to be shown is constant, records
The quality of 100 pipunculid maggots at this time, remaining 15 parts also repeat above-mentioned test procedure, record the quality of 15 parts of fly maggots；Arbitrarily take
100 pipunculid maggots out in a culture dish are to be measured, open the power supply of brilliant wave HH-S2 digital display thermostat water bath, set heating temperature
It is 80 DEG C, when the temperature that water-bath is shown reaches 80 DEG C, then hangs on, waits 80 DEG C of data stabilizations of displays constant, it will be random
The 100 pipunculid maggots taken out are placed in clean container, and container is placed in water-bath, a few minutes are spent, to 100 in container
Fly maggot is all dead, takes out container rapidly, shakes gently container, so that the fly maggot in container is not bonded to together, opens computer
On Scopephoto image measurement processing software, open simultaneously stereomicroscope power supply, scaling board be selected as black calibration
Plate takes out 1 dead fly maggot, places it in clean culture dish, puts smooth, adjusting stereomicroscope as far as possible
Amplification factor, until fly maggot is high-visible in Scopephoto software, then needs are measured by the measuring tool of software
Fly maggot size.According to the data of test measurement, according to normal distribution characteristic, different fly maggots and culture medium particle size are set
The fly maggot of foundation and culture medium particle three-dimensional model are imported the analysis of EDEM software by quantity.
Claims (5)
1. a kind of software maggot material parameter acquiring method based on discrete element, it is characterised in that: including material property gain of parameter and
Granular model establishes two parts.
2. a kind of software maggot material parameter acquiring method based on discrete element according to claim 1, it is characterised in that: material
Physical parameter, that is, material intrinsic parameters, the basic exposure parameter of material and contact model parameter；Material intrinsic parameters include Poisson's ratio,
Modulus of shearing and density；Material parameter includes collision recovery coefficient, coefficient of rolling friction and confficient of static friction；Contact model
Parameter is modelling；Wherein granular model selects soft agarose culture.
3. a kind of software maggot material parameter acquiring method based on discrete element according to claim 2, it is characterised in that:
Wherein material property gain of parameter, including the following steps:
Step A) material intrinsic parameters include Poisson's ratio, modulus of shearing and density, set experimental enviroment condition first, i.e., and it will examination
The condition for testing environment is set as 20 DEG C -30 DEG C of room temperature, and humidity is between 50%-60%；
Poisson's ratio obtains: being directed to software fly maggot special test object, using digital image method, simultaneously by non-contact type test method
And digital picture speckle method is combined, real-time monitoring measures the exact numerical of Poisson's ratio；
Modulus of shearing obtains: initially setting up the simulated tissue model for software fly maggot, obtains fly maggot according to shearing wave imaging method
Shearing wave image, using the shearing wave propagated in the biological tissue of ultrasonic probe tracking fly maggot, then pass through acoustic radiation force pulse
Imaging technique generates the shearing wave of fly maggot tissue, and the time series of shearing wave image is captured by ultrasonic probe, finally utilizes
The calculating of the shearing wave propagation of foundation simultaneously passes through the modulus of shearing that computer exports fly maggot；
Density obtains: regard fly maggot and culture medium particle simulation as sphere, first whole weighing, measures maggot material mixture gross mass M,
Fly maggot particle is picked out manually, is re-weighed, fly maggot gross mass m is measured, fly maggot quantity is n, then the gross mass of culture medium particle is
(M-m), setting high-speed image acquisition system and setting shooting speed is 800~1000 frames/s, will be singled out carrying out fly maggot measuring
Size acquires the average value R of fly maggot volume radius, then can be acquired according to density formula according to normal distribution；By culture medium
Particle approximation also regards sphere model as, sets the multiple of camera, the photo of culture medium particle is shot, further according to the amplification of camera
Multiple calculates the radius distance value of culture medium particle, according to normal distribution, acquires the radius average value r of culture medium particle, equally
The density of culture medium particle is calculated；
Step B) the basic exposure parameter of material includes collision recovery coefficient and coefficient of rolling friction and confficient of static friction；
Collision recovery coefficient obtains: it is big to measure the extreme forces of fly maggot and culture medium particle before rupture first with Texture instrument
It is small, freely falling body impact test is recycled, high-speed image acquisition system is cooperated, sets the shooting speed of high-speed image acquisition system
Degree is 800~1200 frames/second, according to the calculation formula of the object movement of falling object and the defined formula of recovery coefficient, is calculated
The numerical values recited of the collision recovery coefficient of fly maggot and culture medium particle out；
Coefficient of rolling friction obtains: fly maggot and culture medium particle being installed with cubic container, and carried out at cooling to fly maggot
Reason, by temperature control within the scope of 5 DEG C~10 DEG C, the mobility of fly maggot is small at this time and bradykinesia, will be formed build rapidly
The fly maggot and culture medium particle of block are placed on smooth steel plate side center by edge, slowly lift and place fly maggot and culture medium
That side smooth steel plate of particle building block records test process with high-speed camera until building block slowly has the tendency that slide downward,
And the moment with tendency toward sliding is recorded, the angle of smooth steel plate and horizontal plane is recorded using the method for measurement, then
The coefficient of rolling friction of fly maggot is；It similarly utilizes and smooth steel plate is horizontally arranged on the ground, by culture medium particle
Fixed with fixed container as smooth steel plate side center is placed on after building block by edge, slowly lift place culture medium can be with
That side smooth steel plate of building block records test process with high-speed camera until building block slowly has the tendency that slide downward, and
The moment with tendency toward sliding is recorded, the angle of smooth steel plate and horizontal plane is recorded using the method for measurement, then rubbing is
Number isThe then coefficient of rolling friction of culture medium；
Confficient of static friction obtains: the numerical value that the coefficient of rolling friction of fly maggot and culture medium particle that test obtains is measured is multiplied by fortune
Dynamic coefficient, the numerical value obtained at this time is denoted as to the confficient of static friction of fly maggot and culture medium particle respectively；
Step C) contact model gain of parameter:
A kind of maggot material model emulation analysis method based on distinct element method, wherein granular model is established；The following steps are included:
Granular model is established: being set fly maggot and culture medium particle as soft agarose culture, and by its collision model and is set as spring damping
Oscillator system sets its spring constant k, the parameter values such as damped coefficient c；
Using distinct element method using fly maggot and culture medium particle as the sphere of several discrete units, the soft ball of setting contacts mould
Type acquires normal force and tangential force between contact model, fly maggot and culture medium particle further according to the calculation formula of soft agarose culture power
Resultant force and resultant moment between sieve, then the acceleration of fly maggot and culture medium particle is acquired, mathematical knowledge is recycled, integral is asked
The speed and shift value for obtaining fly maggot and culture medium particle obtain the related ginseng between fly maggot and culture medium particle by solving
Number numerical value；
Fly maggot 1600 of same batch same hatching age are taken at random, take 16 clean culture dishes, it is average in each culture dish
100 pipunculid maggots are placed, three containers are taken, proper amount of clear water is added, the fly maggot in each culture dish is put into container and is cleaned three times,
The moisture on fly maggot surface is finally blotted with paper handkerchief；Then the power supply for opening electronic analytical balance, carries out zero calibration, then will be clean
Dry culture dish, which is placed on electronic balance, carries out weighing peeling, takes out the culture dish, and 100 pipunculid maggots of suck dry moisture are light
It is gently placed in culture dish, then culture dish is placed on electronic balance, after data stabilization to be shown is constant, record at this time
100 pipunculid maggots quality, remaining 15 parts also repeat above-mentioned test procedure, record the quality of 15 parts of fly maggots；It is any to take out one
100 pipunculid maggots in part culture dish are to be measured, open the power supply of brilliant wave HH-S2 digital display thermostat water bath, set heating temperature as 80
DEG C, it when the temperature that water-bath is shown reaches 80 DEG C, then hangs on, waits 80 DEG C of data stabilizations of displays constant, will take out at random
100 pipunculid maggots be placed in clean container, container is placed in water-bath, cross a few minutes, to 100 pipunculid maggots in container
It is all dead, container is taken out rapidly, shakes gently container, so that the fly maggot in container is not bonded to together, is opened on computer
Scopephoto image measurement processing software, opens simultaneously stereomicroscope power supply, and scaling board is selected as black calibration plate, is taken
1 dead fly maggot out places it in clean culture dish, puts as far as possible smooth, adjusts putting for stereomicroscope
Big multiple until fly maggot is high-visible in Scopephoto software, then measures the fly maggot of needs by the measuring tool of software
Size sets the number of different fly maggots and culture medium particle size according to normal distribution characteristic according to the data of test measurement
The fly maggot of foundation and culture medium particle three-dimensional model are imported the analysis of EDEM software by amount.
4. a kind of software maggot material parameter acquiring method based on discrete element according to right 3, it is characterised in that: step A) in
When the intrinsic parameters measurement of fly maggot, environmental condition is set as 20 DEG C -30 DEG C of room temperature, and humidity is between 50%-60%；Step B)
The temperature of middle fly maggot setting is within the scope of 5 DEG C~10 DEG C.
5. a kind of software maggot material parameter acquiring method based on discrete element according to right 3, it is characterised in that: high speed image
The shooting speed of acquisition system is set as 1000 frames/s.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811261974.XA CN109632558A (en) | 2018-10-26 | 2018-10-26 | A kind of software maggot material parameter acquiring method based on discrete element |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811261974.XA CN109632558A (en) | 2018-10-26 | 2018-10-26 | A kind of software maggot material parameter acquiring method based on discrete element |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109632558A true CN109632558A (en) | 2019-04-16 |
Family
ID=66066638
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811261974.XA Pending CN109632558A (en) | 2018-10-26 | 2018-10-26 | A kind of software maggot material parameter acquiring method based on discrete element |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109632558A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110457865A (en) * | 2019-08-29 | 2019-11-15 | 哈尔滨工业大学 | Discrete element image modeling method based on Digital Speckle Correlation Method |
| CN112052588A (en) * | 2020-09-03 | 2020-12-08 | 北京航空航天大学 | Dynamic test measuring device for particle rolling resistance model parameters |
-
2018
- 2018-10-26 CN CN201811261974.XA patent/CN109632558A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110457865A (en) * | 2019-08-29 | 2019-11-15 | 哈尔滨工业大学 | Discrete element image modeling method based on Digital Speckle Correlation Method |
| CN110457865B (en) * | 2019-08-29 | 2022-04-15 | 哈尔滨工业大学 | Discrete element image modeling method based on digital speckle method |
| CN112052588A (en) * | 2020-09-03 | 2020-12-08 | 北京航空航天大学 | Dynamic test measuring device for particle rolling resistance model parameters |
| CN112052588B (en) * | 2020-09-03 | 2022-08-02 | 北京航空航天大学 | Dynamic test measuring device for particle rolling resistance model parameters |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Dai et al. | Dynamics of gecko locomotion: a force-measuring array to measure 3D reaction forces | |
| CN109632558A (en) | A kind of software maggot material parameter acquiring method based on discrete element | |
| Piñeros et al. | Evolving technologies for growing, imaging and analyzing 3D root system architecture of crop plants | |
| CN102565061B (en) | Crop biomass nondestructive testing image acquisition and processing device and testing method | |
| CN106102448A (en) | Vegetative state automatic partition analysis apparatus and utilize its Plant Analysis Methods | |
| Komarnicki et al. | Influence of contact surface type on the mechanical damages of apples under impact loads | |
| CN107271460B (en) | Quantitative characterization method for spatial distribution of internal moisture saturation change of porous material | |
| Chevallier et al. | Assessment of bread dough expansion during fermentation | |
| CN110501268A (en) | A kind of micro dust detection method based on Micrograph image processing | |
| Xu et al. | Construction of a discrete element model of buckwheat seeds and calibration of parameters. | |
| CN104931120B (en) | A kind of gravimetric analysis sensing method of fish culture in net pen | |
| Edan et al. | Color and firmness classification of fresh market tomatoes | |
| Wijerathne et al. | A coarse-grained multiscale model to simulate morphological changes of food-plant tissues undergoing drying | |
| Cao et al. | Measurement and calibration of the parameters for discrete element method modeling of rapeseed | |
| Boots et al. | Characterization of the local mechanical texture of animal meat and meat replacements using multi-point indentation | |
| Elmehdi et al. | Evaluating dough density changes during fermentation by different techniques | |
| Cafarelli et al. | An insight into the bread bubble structure: An X-ray microtomography approach | |
| CN108387500A (en) | A method of to local pore structure quantitatively characterizing in aspherical particle accumulation system | |
| Zaidi et al. | Neural network model for the evaluation of lettuce plant growth | |
| Fu et al. | Determination of coefficient of restitution of fresh market apples caused by fruit-to-fruit collisions with a sliding method | |
| Kocur et al. | Automated identification of the coefficient of restitution via bouncing ball measurement | |
| Martens et al. | Sensory analysis for magnetic resonance-image analysis: using human perception and cognition to segment and assess the interior of potatoes | |
| CN201072404Y (en) | Vibration distributing device of particle determining instrument | |
| CN205538538U (en) | Papermaking method reconstituted tobacco product ration spot test appearance | |
| CN206348264U (en) | One kind interference infrared screening rate three-dimensional static test device of particle |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20190416 |