CN107169172A - A kind of vibration analysis emulation mode of Complex Assembly body - Google Patents
A kind of vibration analysis emulation mode of Complex Assembly body Download PDFInfo
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- CN107169172A CN107169172A CN201710261317.4A CN201710261317A CN107169172A CN 107169172 A CN107169172 A CN 107169172A CN 201710261317 A CN201710261317 A CN 201710261317A CN 107169172 A CN107169172 A CN 107169172A
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Abstract
The invention discloses a kind of vibration analysis emulation mode of Complex Assembly body, the artificial tasks of complete machine are divided into the artificial tasks of parts, comprised the steps of：Parts Free Modal is calculated first, then free state modal test is carried out to parts and the simulation model of parts modified using correct modal test data to ensure Correctness of model, revised parts simulation model is finally directly combined into assembly is calculated or model of parts before generates minor structure and then is combined into assembly by fixed-interface methods method and carries out polycondensation calculating, and contrasts and corrects with the test data of complete machine.This method is particularly suitable for use in emulation and the verification experimental verification of large complicated assembly, can simultaneously it be carried out by different staff, shorten emulation cycle, overcome the deficiency for directly carrying out vibration analysis emulation and verification experimental verification cycle length with final assembly body in the past, effectively increase simulation efficiency.
Description
Technical field
The invention belongs to finite element Vibration Simulation field, and in particular to a kind of vibration analysis emulation side of Complex Assembly body
Method.
Background technology
Engineering goods such as automobile, aircraft, spacecraft usually require to be operated in vibration environment, and vibrate meeting for a long time
The problems such as system fatigue failure, contact loosen is brought, these industrial products are typically a complicated assembly, comprising substantial amounts of
Close-coupled between parts and minor structure, each parts, the failure of single parts generally influences whether whole system.Cause
This at the product design initial stage, except consider product function also need to consider product vibration reliability problem.In order to ensure product
Performance meet and require, engineer would generally rule of thumb reserve many surpluses to improve the firm of structure in safe range
Degree, reduces system vibration, improves system reliability.But it is due to that assembly is more complicated, excessive surplus can only cause system
It is unstable.Parameters are determined in order to rational at the product design initial stage, the problem of finding in design reduces design alteration, from
And make cost minimization while guarantee system is reliable and stable and reduce design time, in the design process of Complex Assembly body
Aobvious particularly important of vibration analysis emulation is carried out using finite element.
It is largely first to establish global finite element model and count currently for the vibration analysis finite element simulation of assembly
Calculate, Modifying model is then carried out according to the flutter test data of assembly, because parts are many in assembly, each component and knot
Structure mechanical property is different, and structure is more complicated, often in large complicated assembly complete machine simulation model comprising it is tens of thousands of even
The hundreds of thousands free degree, directly modifies and verifies that needs take a substantial amount of time and energy with test data to whole machine model,
And whole machine model parameter is numerous is difficult to adjust, cause simulation result to differ larger with test data, the confidence level of simulation model compared with
It is low.Another method is first to carry out simulation calculation to model of parts and be modified by experiment, then by model of parts
In material parameter, contact conditions and design conditions set and be transplanted in assembly FEM model, but this can bring largely
Repetitive operation and because contact conditions set complicated, the FEM model result of calculation after transplanting may not
Together, operating efficiency and the confidence level of model are reduced.A kind of formula from bottom to top thus is set up, is adapted to many work Collaboration works
Work has very great meaning to shorten the emulation mode of design time.
The content of the invention
In order to overcome it is existing Complex Assembly body can only be modeled by complete machine, overall test can in the method for correction model
Reliability is low, checking is complicated, it is time-consuming big the problems such as, the present invention provides a kind of vibration analysis emulation mode of Complex Assembly body.
To achieve the above object, the present invention is realized according to following technical scheme：
A kind of vibration analysis emulation mode of Complex Assembly body, is comprised the following steps：
Step S1：Complex Assembly body is divided into several single, relatively independent simple parts of function, and built respectively
Found the structure simulation model of single parts；
Step S2：Free state modal test is carried out to above-mentioned single parts respectively, its eigenfrequncies and vibration models is obtained；
Step S3：Modifying model is carried out to parts simulation model according to the intrinsic frequency and vibration shape result measured；
Step S4：Selection is directly calculated or Reduction Computation：If directly calculating, then it will pass through Modifying model, result
Meet desired parts simulation model and directly combine to form assembly simulation model in a program；If reduction meter
Calculate, then revised parts simulation model is generated into minor structure using immobile interface component mode synthesis method, then will be each
Minor structure is assembled into whole machine model, and model is calculated after being completed；
Step S5：Assembly testing program under various working is determined, the various working refers in free state or constraint
The mode of assembly and response under state, loading or no-load condition；
Step S6：Intrinsic frequency, the vibration shape and response results according to measuring are modified to assembly simulation model, finally
Obtain more accurate computation model.
In above-mentioned technical proposal, several described simple parts are emulated respectively, test and Modifying model process
It is relatively independent, accelerate design process.
In above-mentioned technical proposal, to the Modifying models of parts by adjusting inside material parameter and parts in step S3
Contact conditions carry out.
In above-mentioned technical proposal, straight Reduction Computation is on the basis of direct calculate, to utilize fixed world face knot in step S4
Structure modal synthesis method generates minor structure to single parts, carries out generation minor structure by the way of input command stream in a program
Process.
In above-mentioned technical proposal, assembly testing program kind under various working is determined in step S5, assembly is carried out first
Free state modal test, then carry out assembly constraint state modal test, finally carry out assembly constraint state response examination
Test.
In above-mentioned technical proposal, in step S6, it should carry out Modifying model, regulation ginseng according to free state mode result first
Number is the contact conditions between each parts, as a result reaches after requirement, carries out model further according to constraint morphotype state result and repair
Just, regulation final assembly body and extraneous constraints, it is ensured that after mode result correctness, are tied further according to constraint state response
Fruit carries out Modifying model, the damping parameter of regulating system.
The present invention compared with prior art, has the advantages that：
(1) method for employing adjusted stepwise, splits into some parts by assembly, passes through the freedom of parts first
Modal test data determine the correctness of submodel, are then assembled, and the mode and response data further according to assembly are carried out
Regulation, it is ensured that the confidence level of Complex Assembly body Model.
(2) some parts after splitting are relatively independent, and its emulation, experiment and Modifying model work can be by different works
Make personnel to carry out simultaneously, greatly improve the efficiency of product design work, effectively shorten the construction cycle of product.
(3) when revised submodel is assembled, can use direct-assembling method, obtained result with directly
Obtained result is calculated using assembly progress identical, it would however also be possible to employ the method that model condensation is assembled again, first by each zero
Part model generates minor structure respectively, and model only retains the free degree on interface, so largely reduces model
Complexity, reduces the hardware cost and time cost of modeling and simulating.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the accompanying drawing used required in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is the flow chart of Complex Assembly body vibration analysis emulation mode proposed by the present invention；
Fig. 2 is the mesh generation figure of cabinet entire assembly model；
Fig. 3 (a) is traditional utilization entire assembly model schematic diagram of calculation result；
The assembling that Fig. 3 (b) is the present invention calculates response results schematic diagram.
Embodiment
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is
A part of embodiment of the present invention, rather than whole embodiments.
A kind of vibration analysis emulation mode of Complex Assembly body of the present invention, its flow chart is as shown in figure 1, this method is specific
Comprise the steps of：
(1) Complex Assembly body is divided into several single, relatively independent simple parts of function, transfers to different works
Make personnel in 3 d modeling software while being modeled, then threedimensional model is directed into program respectively, definition material category
Property, the contact conditions inside parts are defined, free grid division, without any external constraint condition, carries out free morphotype
State is calculated, and rigid body mode is got rid of in the result to check.
(2) free state modal test is carried out to above-mentioned single parts respectively, parts are by the way of suspension during experiment
To simulate free boundary, the Free Modal test of parts can be using " single-point-excitation, multi-point sampler " and " excitation, list
The method of point test " is carried out." single-point-excitation, multi-point sampler " is, using vibrator excitation, sensing to be arranged on multiple measuring points
Device." excitation, single-spot testing " is that parts are tapped using power hammer, only the placement sensor on a measuring point.In theory,
Two methods obtain that result is identical, it is contemplated that the accuracy of result and the convenience of experiment, the present invention is using " single-point swashs
Encourage, multi-point sampler " method, parts are applied with sinusoidal excitation to evoke each rank mode of parts, exciting using vibrator
Position, which should try one's best, avoids selection on the nodel line and node of parts, simulation calculation before excited frequency scope should be covered at least
Preceding 10 order frequency.Sensor carries out non-contact measurement using laser doppler vialog, and pick-up point position should cover parts
Dominant plane.When carrying out test data post processing, more obvious frequency and the vibration shape should all be picked up, it is ensured that experiment
As a result the order that basic emulation of coverage capability result is obtained.
(3) Modifying model is carried out to parts simulation model according to the intrinsic frequency and vibration shape result measured.For structure
Single structural member, because inside is free of contact conditions, it is only necessary to frequency and vibration shape adjustment structure part against result of the test
The material parameter of model, adjusts density so that quality in model matches with actual measurement quality, next regulation elasticity first
Modulus and Poisson's ratio make the frequency vibration shape match.For baroque part, because inside has contact conditions, process is adjusted
Also need consider contact conditions setting, density is adjusted first, secondly regulation model contact conditions set so that result of the test and
Former first order modes of simulation calculation coincide substantially, and last regulation elasticity modulus and Poisson's ratio make result more accurate.Work above
Can synchronously it be carried out by different operating personnel.
(4) revised model of parts is assembled.Assemble method is divided into direct-assembling and polycondensation assembling, direct group
Dress method needs that mechdat lattice will be saved as in foregoing all revised models Mechanical modules in a program respectively
Formula file is simultaneously exported, and is then imported All Files in newly-built file and is added connection, you can complete direct-assembling process.
Polycondensation assemble method needs to be extended on the basis of direct-assembling method, is first according to preceding method generation assembly mould
Then foregoing all revised models are generated minor structure, in a program by adding command stream by type using CMS methods respectively
Mode can realize, need to specify in parts and the outside region that there are contact conditions during generation minor structure based on
The free degree is to facilitate follow-up assembling.Then the file all files related to minor structure all copied to where entire assembly model
In folder, assembling process is just completed.The contact conditions between parts are added for the model after assembling and start to calculate, polycondensation side
Method is also needed to add the command stream using minor structure in software, and model can only be calculated when calculating in the main free degree, in meter
The command stream of addition extension minor structure is needed after the completion of calculation, the result in the main free degree is expanded in all frees degree, will
Obtain the result of block mold.Said process is the modal calculation for entire assembly model, is needed in the response of computation model
Use mode superposition method and add damping, in order to consistent with result of the test, the present invention utilizes addition command stream in software
Method carrys out the damping ratios of add-on system.Finally adding upper system incentive and calculating just can be responded.
(5) determine under various working assembly testing program and carry out experiment.To ensure the correct of entire assembly model as far as possible
Property, it is necessary to substep carry out experiment confirmation.Set first of all for the contact conditions verified between each parts, it is necessary to enter to assembly
Row free state modal test, the frequency and the vibration shape of whole model are obtained using vibrator and laser doppler vialog.Then it is
Checking assembly complete machine is set with extraneous constraints, it is necessary to enter the experiment of row constraint morphotype state to assembly, obtains model
Frequency and the vibration shape.Finally in order to verify the damping setting of system, it is necessary to enter row constraint state response test to assembly, bar is encouraged
Part is determined according to actual working state, can be encouraged using single-point-excitation or mass-type foundation, and response pickup point selection is in emphasis
Region-of-interest.
(6) Modifying model is carried out to assembly simulation model according to intrinsic frequency, the vibration shape and the response results measured.First
According to assembly free state two modal testing results adjust parts between contact conditions set so that the frequency of individual parts and
The vibration shape is consistent with result of the test.Secondly state two modal testing results are constrained according to assembly and adjusts whole machine model and extraneous constraint bar
Part.The modal damping of state response results regulating system, the response curve obtained due to testing sometimes are constrained finally according to assembly
Complicated, it is difficult to differentiate order, the method that can be adjusted during regulation damping using frequency-division section, i.e. some frequency band use identical mould
State is damped.If aforementioned excitation mode uses basic excitation, it is ringing relatively between parts that model, which calculates obtained response,
Should, such as calculating absolute response also needs to post-process response results, and response is superimposed with excitation value.
To more fully understand technical scheme, above step is applied to the analysis of certain server machine box model,
It is further described.
(1) due to separate between casing and each circuit board assemblies, so cabinet assembly is divided into machine
Case shell and circuit board component totally 9 submodels, are directed respectively into program according to respective threedimensional model, set material parameter and
Contact conditions etc. and free grid division, it is established that respective FEM model, and carry out free state modal calculation.Net is divided
The FEM model of lattice is as shown in Figure 2.
(2) free state mould measurement is carried out to casing and each circuit board component respectively, using vibrator exciting, adopted
With Polytec laser vibration measurer pick-ups, casing point layout is in upper and lower surface, and circuit board point layout is on positive and negative surface
On.
(3) Modifying model is carried out to casing and each circuit board component respectively, first according to the quality of each part point
Its density is not adjusted, and contact and circuit board veneer and chip between casing and skeleton are then adjusted according to frequency and the vibration shape
And the contact conditions between fire-proof plate.
(4) mechdat forms will be saved as in the FEM model of all parts Mechanical modules in a program
File is simultaneously exported, and then a newly-built model, as entire assembly model, all mechdat formatted files is led in software
Enter, and set up connection between modules and form total entire assembly model, each circuit board component and machine are then added in a model
Contact conditions between case skeleton simultaneously calculate mode, the above-mentioned process for direct-assembling.Polycondensation assembling is first in all parts
The command stream of addition generation minor structure, the model free degree is condensed in the main free degree in the Mechanical modules of model, will
The all of generation arrive assembly about the file of minor structure and according to mechdat formatted files derived from preceding method are complicated together
Under model file folder, direct-assembling then is completed according to preceding method, then addition uses and extends son in entire assembly model
The command stream of structure carries out modal calculation and expands to whole frees degree, you can complete polycondensation assembling process.When calculating response,
Each rank damping ratios are added using mode superposition method speed-up computation, and using command stream, to be contrasted with result of the test.
(5) assembly is carried out and tested.First cabinet assembly is carried out free state modal test to determine circuit plate portion
Contact conditions between part and cabinet skeleton, point layout in casing upper and lower surface and circuit board surface on, due to
Circuit board is in cabinet inside, it is therefore desirable to drill to ensure laser irradiation on the board surface on casing.Then it is right
Cabinet assembly enters the experiment of row constraint morphotype state to determine the constraints of cabinet, and measuring point is still above-mentioned position.Finally to machine
Case assembly carries out response test, is paying close attention to region pick-up.
(6) Modifying model is carried out.Adjusted first according to free state modal data between circuit board component and cabinet skeleton
Contact conditions, secondly according to the constraints at constraint state modal data regulation cabinet hangers, finally according to pick-up on circuit board
The modal damping of the response data regulating system of point.The distributed collaboration emulation of assembly just can be completed by above-mentioned several steps
Work.
Fig. 3 (a) is traditional utilization entire assembly model schematic diagram of calculation result；The assembling that Fig. 3 (b) is the present invention calculates sound
Answer result schematic diagram.Comparison diagram 3 (a) and Fig. 3 (b) understand that the result that assembling calculating is obtained with being calculated using entire assembly model is complete
It is complete consistent, but be due to that assemble method can synchronously be carried out Task-decomposing, therefore can significantly carry by different operating personnel
High workload efficiency.
Although above with general explanation and specific embodiment, the present invention is described in detail, at this
On the basis of invention, it can be made some modifications or improvements, this will be apparent to those skilled in the art.Therefore,
These modifications or improvements, belong to the scope of protection of present invention without departing from theon the basis of the spirit of the present invention.
Claims (6)
1. a kind of vibration analysis emulation mode of Complex Assembly body, it is characterised in that comprise the following steps：
Step S1：Complex Assembly body is divided into several single, relatively independent simple parts of function, and set up respectively single
The structure simulation model of individual parts；
Step S2：Free state modal test is carried out to above-mentioned single parts respectively, its eigenfrequncies and vibration models is obtained；
Step S3：Modifying model is carried out to parts simulation model according to the intrinsic frequency and vibration shape result measured；
Step S4：Selection is directly calculated or Reduction Computation：If directly calculating, then it will be met by Modifying model, result
It is required that parts simulation model directly combine to form assembly simulation model in a program；If Reduction Computation, then
Revised parts simulation model is generated into minor structure using immobile interface component mode synthesis method, then by each minor structure
Whole machine model is assembled into, model is calculated after being completed；
Step S5：Determine assembly testing program under various working, the various working refer to free state or restrained condition,
The mode of assembly and response under loading or no-load condition；
Step S6：Intrinsic frequency, the vibration shape and response results according to measuring are modified to assembly simulation model, are finally given
More accurate computation model.
2. the vibration analysis emulation mode of a kind of Complex Assembly body according to claim 1, it is characterised in that described some
Individual simple parts are emulated respectively, test and the process of Modifying model is relatively independent, accelerate design process.
3. the vibration analysis emulation mode of a kind of Complex Assembly body according to claim 1, it is characterised in that in step S3
The Modifying model of parts is carried out by adjusting the contact conditions inside material parameter and parts.
4. the vibration analysis emulation mode of a kind of Complex Assembly body according to claim 1, it is characterised in that in step S4
Straight Reduction Computation is on the basis of direct calculate, using immobile interface component mode synthesis method to single parts generation son knot
Structure, by the way of input command stream generate the process of minor structure in a program.
5. the vibration analysis emulation mode of a kind of Complex Assembly body according to claim 1, it is characterised in that in step S5
Assembly testing program kind under various working is determined, the free state modal test of assembly is carried out first, assembly is then carried out
Constraint state modal test, finally carry out assembly constraint state response test.
6. a kind of vibration analysis emulation mode of Complex Assembly body according to claim 1, it is characterised in that step S6
In, it should Modifying model is carried out according to free state mode result first, regulation parameter is the contact conditions between each parts,
As a result reach after requirement, Modifying model, regulation final assembly body and extraneous constraint are carried out further according to constraint morphotype state result
Condition, it is ensured that after mode result correctness, Modifying model, the damping of regulating system are carried out further according to constraint state response results
Parameter.
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| CN107862119A (en) * | 2017-10-31 | 2018-03-30 | 无锡市五十五度科技有限公司 | A kind of vibration reliability method of testing |
| CN107991080A (en) * | 2017-12-05 | 2018-05-04 | 中国人民解放军总参谋部第六十研究所 | A kind of high frequency Modal Analysis on Blade method based on non-contact vibration measuring and simulation calculation |
| CN111141518A (en) * | 2019-12-16 | 2020-05-12 | 西安交通大学 | Model-based asymmetric rotor bearing system unbalance identification method |
| CN113836650A (en) * | 2021-08-30 | 2021-12-24 | 北京工业大学 | Modal analysis method based on mechanical structure of laser tracking measurement system |
| CN114218754A (en) * | 2021-11-23 | 2022-03-22 | 中国电子产品可靠性与环境试验研究所（（工业和信息化部电子第五研究所）（中国赛宝实验室）） | Unmanned aerial vehicle digital twinning method, system, computer equipment and storage medium |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107862119A (en) * | 2017-10-31 | 2018-03-30 | 无锡市五十五度科技有限公司 | A kind of vibration reliability method of testing |
| CN107991080A (en) * | 2017-12-05 | 2018-05-04 | 中国人民解放军总参谋部第六十研究所 | A kind of high frequency Modal Analysis on Blade method based on non-contact vibration measuring and simulation calculation |
| CN111141518A (en) * | 2019-12-16 | 2020-05-12 | 西安交通大学 | Model-based asymmetric rotor bearing system unbalance identification method |
| CN113836650A (en) * | 2021-08-30 | 2021-12-24 | 北京工业大学 | Modal analysis method based on mechanical structure of laser tracking measurement system |
| CN113836650B (en) * | 2021-08-30 | 2023-04-28 | 北京工业大学 | Modal analysis method based on mechanical structure of laser tracking measurement system |
| CN114218754A (en) * | 2021-11-23 | 2022-03-22 | 中国电子产品可靠性与环境试验研究所（（工业和信息化部电子第五研究所）（中国赛宝实验室）） | Unmanned aerial vehicle digital twinning method, system, computer equipment and storage medium |
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Application publication date: 20170915 |