CN106483407A - Determine the method that antiskid brake control device vibrates weak link - Google Patents
Determine the method that antiskid brake control device vibrates weak link Download PDFInfo
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- CN106483407A CN106483407A CN201610876510.4A CN201610876510A CN106483407A CN 106483407 A CN106483407 A CN 106483407A CN 201610876510 A CN201610876510 A CN 201610876510A CN 106483407 A CN106483407 A CN 106483407A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/005—Testing of electric installations on transport means
- G01R31/008—Testing of electric installations on transport means on air- or spacecraft, railway rolling stock or sea-going vessels
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/02—Vibration-testing by means of a shake table
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Abstract
By computer technology, a kind of method determining that antiskid brake control device vibrates weak link, determines that antiskid brake control device vibrates weak link, vibrates weak link determined by foundation, propose design recommendation on improvement.The present invention has that energy resource consumption is low, and saves the test exemplar of antiskid brake control device, has significant energy conservation and consumption reduction effects.
Description
Technical field
The present invention relates to the Vibration Analysis field of civilian airplane in transportation category electronic product, specifically adopt computer skill
Art determines the method that antiskid brake control device vibrates weak link.
Background technology
Antiskid brake control device is the electronic product in airplane brake system.
The operation principle of antiskid brake control device is, the wheel rotation speed change telecommunications of receiver wheel speed sensor transmissions
Number, carry out the brake pressure during landing antiskid brake according to this signal of telecommunication and control, normal land antiskid brake can be completed
Control, take-off line brake controls, protection among wheels Stress control, mainwheel contact protection controls, and the wheel after undercarriage stowage stops
Turn various control functions of braking.
Antiskid brake control device bears vibration stress in use, under conditions of there is vibration weak link, just
The fault causing can be vibrated.Shaken it is therefore an objective to be directed to by calculating the vibration weak link determining antiskid brake control device
Dynamic weak link formulates design corrective measure, till proceeding to elimination vibration weak link.
Both at home and abroad in order to determine the vibration weak link of electronic product, develop corresponding technology.
Foreign current situation：
The external vibration weak link determining electronic product using following technology：
1) standard GMW8287 promulgated according to General Motors Overseas Corporation《High accelerated aging, highly accelerated stress screen and take out
Inspection》Carry out vibrating SST, determine vibration weak link；
2) according to MIL-STD-2164《Electronic device environment stress screening》Standard carries out screening of electric components, in screening process
Components and parts vibration fault are as vibration weak link；
3) according to MIL-STD-781《Product development, the reliability test in identification and production》Carry out reliability test, will
The components and parts vibration fault in test are as vibration weak link；
4) the vibration weak link of electronic product is determined using the method calculating；
5) adopt MIL-STD-217F《Electronic product reliability is expected》Determine weak link it is contemplated that during adopt index
Distribution.
Although said method can determine the vibration weak link of a part of electronic product；But there is following deficiency：
1) Highly Accelerated Life Test is destructive testing, and whole machine carries out Highly Accelerated Life Test and determines vibration weak link generation
Valency is too high, and expense is too big；
2) environmental stress screening is a kind of low stress test, the components and parts of vibration fault in environmental stress screening,
Its reason has：Workmanship is low, condensation causes short circuit, vibration damage；Can not be vibration weak link certainly；
3) components and parts of vibration fault occur in reliability test, its reason has：Workmanship is low, vibration damage；Can not
Certainly it is vibration weak link；
4) vibration weak link is determined using the method calculating, the correction to computation model is not enough, and computational accuracy is poor；
5) adopt MIL-STD-217F《Electronic product reliability is expected》Determine weak link it is contemplated that during adopt index
Distribution, discloses a kind of determination antiskid brake control device vibration event in the innovation and creation of Application No. 201610373390.6
The method of barrier distribution, the method proves that the fault of components and parts disobeys exponential, carries out fault under these conditions it is expected that pre-
Meter result can produce the result not meeting reality
Present status in China：
Affected by external electronic product Development Techniques, domestic electronic product is also adopted by following technology and determines electronic product
Vibration weak link：
1) standard GMW8287 promulgated according to General Motors Overseas Corporation《High accelerated aging, highly accelerated stress screen and take out
Inspection》Carry out vibrating SST using the method for Highly Accelerated Life Test, will occur in test the components and parts of vibration fault as
Vibration weak link；
2) according to GJB1032《Electronic device environment stress screening》Standard carries out screening of electric components, occurs in screening process
The components and parts of vibration fault are as vibration weak link；
3) according to GJB899《Reliability determination and proof test》Carry out reliability test, in test, vibration fault will occur
Components and parts as vibration weak link；
4) the vibration weak link of electronic product is determined using the method calculating；
5) adopt GJB299C《Electronic product reliability is expected》Intended vibrations weak link；
6) the disclosed method determining that airplane antiskid braking control box vibrates the working stress limit of ZL 201110310884.7
In, the vibration working limit of analog circuit antiskid braking control box is determined using reliability enhancement testing equipment；
7) in a kind of method of antiskid braking control box flutter failure limit test disclosed in ZL 201310169895.7,
Determine the flutter failure limit of digital circuit antiskid braking control box using three test complexs；
Although the above-mentioned technology of domestic employing, it can be found that the vibration weak link of a part of electronic product, equally exists
Following deficiency：
1) Highly Accelerated Life Test is destructive testing, and whole machine carries out Highly Accelerated Life Test and determines vibration weak link generation
Valency is too high, 1,000,000 yuan of the price of a set of antiskid brake control device, and expense is too big；
2) components and parts of vibration fault occur in environmental stress screening, its reason has：Workmanship is low, condensation causes
Short circuit, vibration damage is it is impossible to be vibration weak link certainly；
3) components and parts of vibration fault occur in reliability test, its reason has：It is short that workmanship is low, condensation causes
Road, vibration damage is it is impossible to be vibration weak link certainly；
4) vibration weak link is determined using the method calculating, the correction to computation model is not enough, and computational accuracy is poor；
5) adopt GJB299C《Electronic product reliability is expected》Determine weak link it is contemplated that during adopt exponential.
Propose a kind of determination antiskid brake control device vibration fault to divide in the innovation and creation of Application No. 201610373390.6
The method of cloth.The method is analyzed using the vibration fault data that one group of solid-state relay is extracted in Weibull distribution, analysis knot
Really this group fault data obeys form parameter m=3.569, scale parameter t0=2.6828 × 1016Weibull distribution, work as employing
When exponential carries out fault rate calculating, produce and be more than 103Error.Invention 201610373390.6 demonstrates prior art
Not enough.
6) purpose of ZL 201110310884.7 is to determine the overproof vibration work of analog circuit antiskid braking control box performance
Make the limit, this test has destructiveness, damage components and parts can be changed after off-test and repair product.Although can be according to test
Weak link is vibrated in process analyses, but once test puts into 2 sets of antiskid braking control box economic losses is exactly 500,000 yuan, test
300,000 yuan of expense.And 2 sets of quantity are few, determine that the precision of vibration weak link is low；Antiskid braking control box in this invention is
Antiskid brake control device.
7) purpose of ZL201310169895.7 is to determine the flutter failure limit of digital circuit antiskid braking control box, this
It is a kind of destructive testing, repairing product after off-test has not had economic worth.Although can be analyzed according to process of the test
Vibration weak link, but once test puts into 2 sets of antiskid braking control box economic losses is exactly 2,000,000 yuan.And 2 sets of quantity
Very little, determine that the precision of low temperature weak link is low.Antiskid braking control box in this invention is antiskid brake control device.
Content of the invention
For overcome test period length present in prior art, costly, capital consumption big, the low shortcoming of computational accuracy,
The present invention proposes a kind of method determining that antiskid brake control device vibrates weak link.
The detailed process of the present invention is：
Step 1, determines that this antiskid brake control device vibrates the condition that weak link calculates：
The first step：Determine the vibration value applying in calculating.
During devise a stratagem calculation, the vibration value of applying is：10Grms～20Grms.
Second step, determines the Position of Vibrating in calculating.
Determine that panel is that the screw that this panel is all connected with housing with data board is installed with the Position of Vibrating of data board
Position.
3rd step, determines the direction of excitation in calculating.
Determine that direction of excitation is the direction perpendicular to panel and data board.
4th step, determines the vibration spectral pattern in calculating.
Determine that the vibration spectral pattern in calculating is composed for HB5830.5 broad-band random vibration.
5th step, determines constrained and the constraint direction of circuit board.
Determine circuit board constrained be screw position；Constraint direction is three translational degree of freedom, three rotatably mounted
The constraints of degree.
Step 2, determines the model of vibration of this antiskid brake control device：
The first step, sets up the three-dimensional geometric shapes of this antiskid brake control device.
Set up the three-dimensional geometric shapes of this antiskid brake control device.
Second step, changes three-dimensional geometric shapes.
According to finite element modeling demand, change the three-dimensional geometric shapes of antiskid brake control device according to following rules；Institute
The rule stated is：Remove the hole that diameter is less than 1mm；Remove the boss that thickness is less than 0.5mm；Remove radius be less than 1mm circle
Angle；Weight less than or equal to 2g part is added on circuit boards, the part that quality is more than 2g is modeled and weight setting, makes this
The weight of antiskid brake control device is constant；The quality such as components and parts employing, isopyknic mass substitute.
3rd step, arranges the parameter of this antiskid brake control device：
The parameter of described setting includes：
Setting antiskid brake control device housing is aluminum；
The material of setting antiskid brake control device circuit board is FR4 epoxy glass fiber plate.
The encapsulation of components and parts collects.The encapsulation of described components and parts collects including Plastic Package, Metal Packaging and ceramic package.
4th step, FEM meshing：
Using scanning the stress and strain model completing antiskid brake control device, housing is individually divided, to two pieces of circuit
Plate carries out cell size control, carries out region division to each module, components and parts are individually divided.
Step 3, revises the model of vibration of this antiskid brake control device：
The formula of mode Error Calculation：
Calculate mode error delta=[(calculating mode-test mode)/calculating mode] %, the dimension of mode is Hz.
Panel first-order modal Error Calculation：(215-212)/215=1.4%；
Panel second-order modal Error Calculation：(301-295)/301=2%；
Data board first-order modal Error Calculation：(224-221)/224=1.3%；
Data board second-order modal Error Calculation：(318-313)/318=1.6%；
Step 4, determines the resonant frequency of each circuit board and maximum vibration shape position：
Determine the resonant frequency of panel and the resonant frequency of maximum vibration shape position and data board and maximum vibration shape position successively
Put.The single order respectively obtaining the one class resonant frequency, second order resonant frequency and three rank resonant frequencies and data board of this panel is humorous
Vibration frequency, second order resonant frequency and three rank resonant frequencies.
Step 5, determines the acceleration responsive numerical value of circuit board random vibration：
Obtain one class resonant frequency, second order resonant frequency and the three rank resonant frequencies of circuit board.
Step 6, determines random vibration dynamic respond data：
Respectively obtain the displacement maximum of whole machine, panel and data board.
Step 7, determines vibration weak link：
Vibration value scope in being used according to this antiskid brake control device and result of calculation determine vibration weak link.
The acceleration responsive data of random vibration of whole machine, panel and data board and anti-skidding is arrived according to obtain
Braking control device random vibration dynamic respond numerical value, determines vibration weak link.If acceleration responsive numerical value exceeds in use
Maximum magnitude, and the maximum position of displacement is vibration weak link.Should be designed improving when there is vibration weak link.
So far, determine the vibration weak link of this antiskid brake control device using computer technology, determined by shake
Dynamic weak link improves foundation as design.
Determine in described step 4～step 6 that the resonant frequency of panel and the process of maximum vibration shape position are：
A, each mounting screw position input signal,
B, determine model analyses exponent number：Three ranks；
C, input Position of Vibrating.Position of Vibrating is in the screw installation position of this antiskid brake control device housing；Exciting side
To the direction for vertical panel；And be excited at the same time in each screw installation position；
D, click operation program.
The vibration value of described pumping signal：10Grms～20Grms；Frequency range：20Hz～2000Hz；Frequency Response Analysis
Step-length：20Hz；Vibration spectral pattern HB5830.5 broad-band random vibration spectrum.
The present invention determines, by computer technology, the method that antiskid brake control device vibrates weak link, and foundation is determined
Vibration weak link, propose design recommendation on improvement.The present invention has that energy resource consumption is low, and saves antiskid brake control device
Test exemplar, has significant energy conservation and consumption reduction effects.
Technical scheme is formulated according to the vibration fault reason of following antiskid brake control device：
1) solder joint ftractures under vibrating conditions；
2) pin fracture under vibrating conditions；
3) circuit board loosens under vibrating conditions；
4) device damage under vibrating conditions.
The following technical scheme determining antiskid brake control device weak link is formulated according to failure cause：
1) the vibration value scope inputting in a computer is by surveying determination；
2) direction of excitation produces the direction of maximum displacement for circuit board；
3) random vibration is adopted to compose；
4) installment state aboard according to antiskid brake control device, using six degree of freedom staff cultivation；
5) vibrate the criterion of weak link：Acceleration responsive value exceeds maximum value in use, and this position determines that
For vibrating weak link.
Compared with prior art, the implementation result of the present invention is：
Determine the vibration weak link of this antiskid brake control device using computer technology, compared to the prior art have
Save test period, the effect saved expenditures, reduce energy resource consumption.Specifically implementation result has：
1) propose a kind of determination antiskid brake control device in the innovation and creation of Application No. 201610373390.6
The method of vibration fault distribution.It is 3.569 that the method proves that the vibration fault of electronic devices and components obeys form parameter in theory
Weibull distribution, disobey exponential, analysis result is the Weibull model the invention provides Vibration Analysis, card
Bright existing technology adopts exponential intended vibrations fault rate to have 107Error.So the present invention is determining vibration weak link
During be 3.569 using form parameter Weibull distribution.
The survey of antiskid brake control device vibratory response is disclosed in the innovation and creation of Application No. 201610585004.X
Method for testing, the method adopts two jiaos to hang, the power of corner suspension circuit plate hammer excitation method, also adopt 5Grms, 10Grms,
15Grms, 20Grms, 25Grms vibrate the vibratory response that actual measurement quality on value is more than all components and parts of 3g, revise antiskid brake
The model of vibration of control device, the present invention adopts the model of vibration of this invention correction to determine vibration weak link, overcomes existing
The low shortcoming of technology acuracy.
2) there is the effect saving test period, determine that vibration weak link needs 7 days using Highly Accelerated Life Test, adopt
Only need 1 day time with the technology of the present invention.
3) there is the effect saving test exemplar expense, a set of antiskid brake control device is worth million, carry out high acceleration
Although life test can determine vibration weak link, after off-test there is vibration damage report in this antiskid brake control device
Useless；Consumption test exemplar is not just had using computer technology.
4) there is the effect saving test funds, Highly Accelerated Life Test expense hourly is 1500 yuan, the test of 7 days
Expense is paid：7 days × 8h/ is daily × 1500 yuan/h=84000 unit, avoid the need for paying this expense using computer.
5) there is the effect reducing energy resource consumption, the vibration SST power consumption in Highly Accelerated Life Test is 120 kilowatts,
Energy resource consumption is big；The power consumption of computer is 100 watts.
6) present invention surveys the vibratory response of circuit board each point, does not damage antiskid brake control device and shakes it is therefore an objective to improve
The computational accuracy of movable model.
The present invention and the Integrated comparative of prior art implementation result：
1) and environmental stress screening effectiveness comparison：Environmental stress screening is 100% to be screened, do not occur in screening therefore
The antiskid brake control device of barrier can dispatch from the factory, and that breaks down can not dispatch from the factory；Can be in development process using the method calculating
Middle discovery and exclusion vibration weak link, improve product development quality；
2) often set antiskid brake control device vibration calculating and the time of environmental stress screening, expense compare：Environmental stress
Screening expense 80h × 500 yuan/h=40000 unit；Computer carries out vibrating weak link computational costs：15h × 100/h=1500
Unit；
3) compare with the time of reliability test, expense；According to GJB899A the 21st scheme, when antiskid brake control device
MTBF when being 3000h, test period is 3300h, and testing expenses are：3300h × 500 yuan/h=1650000 unit；Computer enters
The expense that row vibration weak link calculates：15h × 150/h=1500 unit；
4) and existing computing technique precision comparison；Prior art revised vibration calculating single order precision is 10%, by mistake
Difference is big；The present invention adopts the test side of the antiskid brake control device vibratory response disclosed in Application No. 201610585004.X
The model of method correction, makes vibration weak link calculation error be less than 5%.
Specific embodiment
The present embodiment is taking a kind of civil transport antiskid brake control device as a example.There is provided power supply by aircraft, receive wheel
The rotation speed change amount signal of telecommunication, carries out antiskid brake Stress control.It is anti-skidding that this antiskid brake control device can complete normal land
Brake controls, protection among wheels, ground protection, the wheel rotation stop brake function after taking off.
In described antiskid brake control device, panel, data board are installed, totally two pieces of circuit boards.Analysis adopts to liking
The model of vibration of this antiskid brake control device that software is set up.
Current embodiment require that design conditions be：
The software of 1 employing：
1) drawing three-dimensional geometric figure software：CITIA V5R18；
2) modeling software：Hypermesh/10.0；
3) analysis software：NASTRAN2008r1；.
The environmental condition of 2 inputs：Room temperature；
3 model analyses exponent numbers：Three ranks；
4 analysis frequency ranges：20Hz～2000Hz；
5 Frequency Response Analysis step-lengths：20Hz；
Step 1, determines that this antiskid brake control device vibrates the condition that weak link calculates.
The first step：Determine the vibration value applying in calculating.
According to actual measurement, the maximum vibration value of this antiskid brake control device is 20Grms, minimum 10Grms.Determine meter
During calculation, the vibration value of input is：10Grms～20Grms.
Second step, determines the Position of Vibrating in calculating.
The panel of antiskid brake control device is all connected with housing by the screw being distributed on four angles with data board.
Determine Position of Vibrating be panel, the screw installation position of data board.
3rd step, determines the direction of excitation in calculating.
Under vibrating conditions, maximum perpendicular to the direction displacement of circuit board, excite the effect of fault good, determine direction of excitation
It is the direction perpendicular to panel and data board.
4th step, determines the vibration spectral pattern in calculating.
Determine that the vibration spectral pattern in calculating is composed for HB5830.5 broad-band random vibration.
5th step, determines constrained and the constraint direction of circuit board
Determine circuit board constrained be screw position；Constraint direction is three translational degree of freedom, three rotatably mounted
The constraints of degree.
Step 2, determines the model of vibration of this antiskid brake control device.
The first step, sets up the three-dimensional geometric shapes of this antiskid brake control device
According to the dimension of picture in the drawing of this antiskid brake control device, components and parts inventory, components and parts handbook, adopt
CITIA V5R18 sets up the three-dimensional geometric shapes of this antiskid brake control device.
Second step, changes three-dimensional geometric shapes
According to finite element modeling demand, change the three-dimensional geometric shapes of antiskid brake control device according to following rules：
1) remove the hole that diameter is less than 1mm；
2) remove the boss that thickness is less than 0.5mm；
3) remove radius be less than 1mm fillet；
4) weight less than or equal to 2g part is added on circuit boards, the part more than 2g for the quality is modeled and weight sets
Put, make the weight of this antiskid brake control device constant；
5) quality such as components and parts employing, isopyknic mass substitute.
3rd step, arranges the parameter of this antiskid brake control device：
1) setting antiskid brake control device housing is aluminum；
2) material of setting antiskid brake control device circuit board is FR4 epoxy glass fiber plate.
3) encapsulation of components and parts collects following three：
A) Plastic Package；
B) Metal Packaging；
C) ceramic package.
4th step, FEM meshing
Initially with scanning the stress and strain model completing antiskid brake control device；Secondly housing is individually divided；So
Afterwards cell size control is carried out to two pieces of circuit boards；Then region division is carried out to each module；Finally components and parts are carried out individually
Divide.The number of grid finally giving is 119437, and mesh quality inspection is completed using carrying algorithm click in Hypermesh.
Step 3, revises the model of vibration of this antiskid brake control device
Disclose a kind of antiskid brake control device vibration to ring in the innovation and creation of Application No. 201610585004.X
The method of testing answered.The method completes the model of vibration correction of antiskid brake control device, and the present invention quotes invention
201610585004.X correction result be：
The formula of mode Error Calculation：
Calculate mode error delta=[(calculating mode-test mode)/calculating mode] %, modal value frequency representation.
Panel first-order modal Error Calculation：(215-212)/215=1.4%；
Panel second-order modal Error Calculation：(301-295)/301=2%；
Data board first-order modal Error Calculation：(224-221)/224=1.3%；
Data board second-order modal Error Calculation：(318-313)/318=1.6%；
The calculation error of invention 201610585004.X controls calculation error to be less than 3%, meets the required precision of the present invention.
Step 4, determines the resonant frequency of each circuit board and maximum vibration shape position
The panel of antiskid brake control device or any one piece of data board break down, and antiskid brake control device all loses
Lose function.Antiskid brake control device vibration analysis it is important that panel and data board.Anti-skidding using revise through step 3
Braking control device model of vibration is determining the resonant frequency of panel or data board and maximum vibration shape position.
The first step, determines the resonant frequency of panel and maximum vibration shape position.
Determine that the resonant frequency of panel and the process of maximum vibration shape position are：
1st, in the position input signal of panel mounting screw, the vibration value of pumping signal：10Grms～
20Grms；Frequency range：20Hz～2000Hz；Frequency Response Analysis step-length：20Hz；Vibration spectral pattern HB5830.5 broad-band random vibration
Spectrum.
2nd, determine model analyses exponent number：Three ranks；
3rd, input Position of Vibrating.Position of Vibrating is in the screw installation position of this antiskid brake control device housing；Exciting side
To the direction for vertical panel；And be excited at the same time four screw installation positions；
4th, click on panel operation program, obtain table 1：
Table 1 panel resonant frequency and vibration shape maximum position data summary table
| Exponent number | Resonant frequency (Hz) | Vibration shape maximum position | Analytic explanation |
| Single order | 212 | Panel middle and upper part | Single order resonance |
| Second order | 295 | Panel middle and upper part | Second order resonance |
| Three ranks | 365 | Panel middle and upper part | Three rank resonance |
Second step, determines the resonant frequency of data board and maximum vibration shape position.
Determine that the resonant frequency of data board and the process of maximum vibration shape position are：
1st, inputted vibration value.Vibration value is 10Grms～20Grms；Frequency range is 20Hz～2000Hz；Frequency response divides
Analysis step-length is 20Hz；Vibration spectral pattern HB5830.5 broad-band random vibration spectrum.
2nd, determine that model analyses exponent number is three ranks；
3rd, input Position of Vibrating.Position of Vibrating is in the screw installation position of this antiskid brake control device housing；Exciting side
To the direction for perpendicular recording plate；And be excited at the same time four screw installation positions；
4th, click on data board operation program, obtain table 2：
Table 2 data board resonant frequency and vibration shape maximum position data summary table
| Exponent number | Resonant frequency (Hz) | Vibration shape maximum position | Analytic explanation |
| Single order | 212 | Panel middle and upper part | Single order resonance |
| Second order | 295 | Panel middle and upper part | Second order resonance |
| Three ranks | 365 | Panel middle and upper part | Three rank resonance |
Step 5, determines the acceleration responsive numerical value of circuit board random vibration.
The process determining antiskid brake control device circuit board acceleration responsive numerical value is：
1) inputted vibration value：10Grms～20Grms；Frequency range：20Hz～2000Hz；Frequency Response Analysis step-length：
20Hz；Vibration spectral pattern HB5830.5 broad-band random vibration spectrum.
2) model analyses exponent number：Single order；
3) input Position of Vibrating：Screw installation position in this antiskid brake control device housing；Direction of excitation is vertical
Panel, the direction of data board；And be excited at the same time in four screw installation positions of every block of plate；
4) click on operation program, obtain table 3：
The acceleration responsive data summary table of table 3 random vibration
| Title | Fundamental frequency, Hz | Grms is maximum | Analytic explanation |
| Whole machine | 810 | 27 | Panel installation site |
| Panel | 215 | 27 | Solid-state relay installation site |
| Data board | 224 | 21 | Audion installation site |
Step 6, determines random vibration dynamic respond data.
The process determining antiskid brake control device random vibration dynamic respond numerical value is：
1) inputted vibration value.Vibration value is 10Grms～20Grms；Frequency range is 20Hz～2000Hz；Frequency response divides
Analysis step-length is 20Hz；Vibration spectral pattern HB5830.5 broad-band random vibration spectrum.
2) determine that model analyses exponent number is single order；
3) input Position of Vibrating.Position of Vibrating is in the screw installation position of this antiskid brake control device housing；Exciting side
To the direction for vertical panel, data board；And be excited at the same time in four screw installation positions of every block of plate；
4) click on operation program, obtain table 4：
Table 4 antiskid brake control device random vibration dynamic respond numerical value collects
Step 7, determines vibration weak link
Vibration value scope in being used according to this antiskid brake control device and result of calculation determine vibration weak link.
The vibration value scope surveying this antiskid brake control device in being used is 10Grms～20Grms；Frequency model
Enclosing is 20Hz～2000Hz.Test side using the antiskid brake control device vibratory response disclosed in 201610585004.X
Method, revises vibration calculating model and is calculated, and obtains table 3 and table 4 calculates data, in the presence of pumping signal, panel
Fundamental frequency when being 215Hz, the acceleration peak response of this panel is 27Grms；Condition in maximum acceleration response
Under, the maximum displacement of panel is 0.0327mm.
The acceleration peak response of panel be 27Grms beyond scope of design, and the condition in peak acceleration
Under, the maximum displacement of panel is 0.0327mm.It is thus determined that panel is vibration weak link, the position of weak link is solid
State relay installation site, this weak link can occur vibration fault in use, need to be designed improving eliminating weak link.
So far, determine the vibration weak link of this antiskid brake control device using computer technology, determined by shake
Dynamic weak link improves foundation as design.
Claims (4)
1. a kind of method determining antiskid brake control device vibration weak link is it is characterised in that detailed process is：
Step 1, determines that this antiskid brake control device vibrates the condition that weak link calculates：
The first step：Determine the vibration value applying in calculating：Determine in calculating process apply vibration value be 10Grms～
20Grms；
Second step, determines the Position of Vibrating in calculating：Determine panel and data board Position of Vibrating be this panel all with remember
The screw installation position that record plate is connected with housing；
3rd step, determines the direction of excitation in calculating：Determine that direction of excitation is the direction perpendicular to panel and data board；
4th step, determines the vibration spectral pattern in calculating：Determine that the vibration spectral pattern in calculating is composed for HB5830.5 broad-band random vibration；
5th step, determines constrained and the constraint direction of circuit board：Determine circuit board constrained be screw position；Constraint
Direction is three translational degree of freedom, the constraints of three rotational freedoms；
Step 2, determines the model of vibration of this antiskid brake control device：
The first step, sets up the three-dimensional geometric shapes of this antiskid brake control device：Set up the three-dimensional of this antiskid brake control device
Geometric figure；
Second step, changes three-dimensional geometric shapes：According to finite element modeling demand, control dress according to following rules modification antiskid brake
The three-dimensional geometric shapes put；Described rule is：Remove the hole that diameter is less than 1mm；Remove the boss that thickness is less than 0.5mm；Go
Fall radius be less than 1mm fillet；Weight less than or equal to 2g part is added on circuit boards, the part that quality is more than 2g is carried out
Modeling and weight setting, make the weight of this antiskid brake control device constant；Quality, isopyknic masses such as components and parts employing
Substitute；
3rd step, arranges the parameter of this antiskid brake control device：The parameter of described setting includes：
Setting antiskid brake control device housing is aluminum；
The material of setting antiskid brake control device circuit board is FR4 epoxy glass fiber plate；
The encapsulation of components and parts collects；
4th step, FEM meshing：Using scanning the stress and strain model completing antiskid brake control device, list is carried out to housing
Solely divide, cell size control is carried out to two pieces of circuit boards, region division is carried out to each module, components and parts are individually drawn
Point；
Step 3, revises the model of vibration of this antiskid brake control device：
The formula of mode Error Calculation：
Calculate mode error delta=[(calculating mode-test mode)/calculating mode] %, modal value frequency representation；
Panel first-order modal Error Calculation：(215-212)/215=1.4%；
Panel second-order modal Error Calculation：(301-295)/301=2%；
Data board first-order modal Error Calculation：(224-221)/224=1.3%；
Data board second-order modal Error Calculation：(318-313)/318=1.6%；
Step 4, determines the resonant frequency of each circuit board and maximum vibration shape position：
Determine the resonant frequency of panel and the resonant frequency of maximum vibration shape position and data board and maximum vibration shape position successively；Point
Do not obtain the single order resonance frequency of the one class resonant frequency, second order resonant frequency and three rank resonant frequencies and data board of this panel
Rate, second order resonant frequency and three rank resonant frequencies；
Step 5, determines the acceleration responsive numerical value of circuit board random vibration：
Respectively obtain whole machine, panel, the one class resonant frequency of data board and acceleration-root-mean square maximum, and acceleration is equal
The response position of root maximum；
Step 6, determines random vibration dynamic respond data：
Respectively obtain the displacement maximum of whole machine, panel and data board, and the generation position of maximum displacement；
Step 7, determines vibration weak link：
Vibration value scope in being used according to this antiskid brake control device and result of calculation determine vibration weak link；
The acceleration responsive data of random vibration and the antiskid brake of whole machine, panel and data board is arrived according to obtain
Control device random vibration dynamic respond numerical value, determines vibration weak link；If acceleration responsive numerical value exceeds maximum in use
Value, and the maximum position of displacement is vibration weak link；Should be designed improving when there is vibration weak link；
So far, determine the vibration weak link of this antiskid brake control device using computer technology, determined by vibrate thin
Weak link improves foundation as design.
2. as claimed in claim 1 determine that antiskid brake control device vibrates the method for weak link it is characterised in that described step
Determine in rapid 4～step 6 that the resonant frequency of panel and the process of maximum vibration shape position are：
A, each mounting screw position input signal,
B, determine model analyses exponent number：Three ranks；
C, input Position of Vibrating；Position of Vibrating is in the screw installation position of this antiskid brake control device housing；Direction of excitation is
The direction of vertical panel；And be excited at the same time in each screw installation position；
D, click operation program.
3. the method determining antiskid brake control device vibration weak link as claimed in claim 2 is it is characterised in that described swash
Encourage the vibration value of signal：10Grms～20Grms；Frequency range：20Hz～2000Hz；Frequency Response Analysis step-length：20Hz；Vibration
Spectral pattern HB5830.5 broad-band random vibration is composed.
4. as claimed in claim 1 determine that antiskid brake control device vibrates the method for weak link it is characterised in that described unit
The encapsulation of device collects including Plastic Package, Metal Packaging and ceramic package.
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