CN105718633A - Method for analyzing load of chassis part - Google Patents
Method for analyzing load of chassis part Download PDFInfo
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- CN105718633A CN105718633A CN201610023813.1A CN201610023813A CN105718633A CN 105718633 A CN105718633 A CN 105718633A CN 201610023813 A CN201610023813 A CN 201610023813A CN 105718633 A CN105718633 A CN 105718633A
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- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
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Abstract
The invention discloses a method for analyzing the load of a chassis part. The method comprises the following steps: (1) acquiring data of a test field load spectrum of the chassis part; (2) carrying out KLT road surface filtration on the test field load spectrum of the chassis part; (3) carrying out rain flow counting and accumulated damage calculation on the test field load spectrum of the chassis part; (4) determining block spectrum load amplitude and equivalent damage cycle index of the chassis part; and (5) evaluating an equivalent block spectrum of the chassis part. According to the method disclosed in the invention, the test field load spectrum, acquired according to a reliability test specification, of the chassis part is taken as input, and KLT road surface RP filtration and rain flow counting are carried out on the test field load spectrum, and Miner fatigue accumulated damage criterion is utilized to calculate the total damage of S-N curves, so that the load analysis, taking an equivalent damage as target, from the test field load spectrum to the equivalent block spectrum of the chassis part is realized. The method disclosed in the invention is capable of ensuring the consistency between the design, CAE analysis and DV test load of the chassis part and the test field load of the chassis part, unifying the evaluation standard, shortening the analysis and test time and enhancing the analysis and test efficiency.
Description
Technical field
The present invention relates to the loading analysis method of automobile bottom diskware.
Background technology
The structure design research and development of Automobile Chassis Parts, early stage need to be tested through cae analysis, optimization and DV
Verify these key links, the automobile reliability road test card in later stage after meeting design object, could be entered.
At present, main by the load conduct at the car load Dynamics Simulation output each attachment point of chassis member
The load input of CAE analysis of fatigue, carries out structural fatigue analysis and optimization.The load gathered due to test site
Spectrum time history is longer, under the conditions of existing software and hardware, causes the Dynamics Simulation cycle longer, CAE
Analyzing and optimize inefficient, research and development of products progress often can not be guaranteed.
DV verification experimental verification reproduces suffered internal force load excitation, so also can only in real time because using actuator
Take the mode that dynamic analog or experience load load to complete DV test.Dynamic analog needs by iteration side
Formula obtains the excitation load of test, for multiaxis couple stressing conditions, to iterative scheme, actuator ability and
The design of frock stand requires the highest, and not only stand manufacturing cost is expensive, and error is within 5%
RMS iteration precision requires also to be difficult to, and the test period is longer；Empirically load load mode carries out stand
Test, it is impossible to ensure the quinolin-eta between experience load (safety coefficient is bigger) and test site road load,
Parts bench test cracking often occurs and indehiscent abnormal phenomena is tried on road, be unfavorable for chassis member lightweight
The precisely evaluation of design and loss of weight fall are originally.
Summary of the invention
In order to overcome above-mentioned the deficiencies in the prior art, the present invention provides a kind of loading analysis method of chassis member, with
Premised on equivalent damage, meet test site loading spectrum and equivalent block spectrum be equal to the damage of chassis member generation, it is ensured that
Chassis member design, cae analysis and DV test load and the concordance of test site load, unified evaluation criterion,
Shorten analysis, test period, promote and analyze and test efficiency.
The loading analysis method of the chassis member that the present invention proposes comprises the steps:
1, chassis member test site loading spectrum data acquisition；
2, chassis member test site loading spectrum key fatigue damage life test (KLT) road surface filtering: by entering
Row rain stream projection filtering (RP filtering) processes, and filters not damaged data；
3, loading spectrum rain-flow counting in chassis member test site processes and accumulated damage calculates: by filtered loading spectrum
Carry out rain-flow counting process, obtain journey to count results；According to Fatigue Summation Damage Theory, by count results pair
The chassis part standard S-N curve that should build carries out accumulative total damage measurement；
4, chassis member block spectrum loading amplitude and equivalent damage cycle-index determine: determine count results figure from journey
The load amplitude of block spectrum, the total impairment value of accumulation that the total damage of accumulation using test site loading spectrum is composed as block, for
Identical standard S-N curve carries out the equivalent damage cycle-index of corresponding load amplitude and determines；
5, chassis member equivalent block spectrum is evaluated.
The present invention presses the test site loading spectrum of reliability test specification collection for inputting, by entering it with chassis member
Row KLT road surface RP filtering, rain-flow counting, step for S-N application of curve and receive Cumulative Fatigue Damage criterion meter
Calculate its total damage etc. to process, establish what the chassis member test site loading spectrum with equivalent damage as target was composed to equivalent block
Loading analysis method, through to block spectrum and the cae analysis results contrast of test site loading spectrum, not only focus divides
Cloth is consistent, and damage results also coincide.This method may insure that chassis member design, cae analysis and DV test
The concordance of load and test site load, unified evaluation criterion, shorten analyze, test period, promote analyze and
Test efficiency.
This method cannot be only used for CAE fatigue endurance analysis, it is also possible to is applied to the test of chassis member DV, for
Its equivalent damage bench test provides load input, has stronger operability.
Accompanying drawing explanation
Fig. 1 is the flow chart of steps of the present invention；
Fig. 2 is strain gauge adhesion figure at swing arm ball pin axle journal；
Fig. 3 be at swing arm ball pin test site loading spectrum RP filtering before and after time domain comparison diagram；
Fig. 4 be at swing arm ball pin RP filtering after test site loading spectrum journey to count results figure；
Fig. 5 is that at swing arm ball pin, journey calculates schematic diagram to counting Cumulative Fatigue Damage；
Fig. 6 is swing arm block spectrum and test site loading spectrum cae analysis Comparative result figure.
Detailed description of the invention
Present disclosure is further illustrated below in conjunction with accompanying drawing:
The steps flow chart of the present invention is as shown in Figure 1:
1, chassis member test site loading spectrum data acquisition: arrange strain according to load condition suffered by chassis member reality
Test bridge, completes the collection of chassis member test site strain spectrum with car load, and the nominal data obtained by early stage is believed
Breath can directly obtain chassis member test site loading spectrum.
2, chassis member test site loading spectrum KLT (crucial fatigue damage life test) road surface filtering: by right
It carries out RP filtering (the projection filtering of rain stream) and processes, and filters not damaged data so that it is each passage load data
On the basis of keeping original damage, reduction load data amount to greatest extent, shortens the cae analysis time, promotes
Cae analysis efficiency.
3, loading spectrum rain-flow counting in chassis member test site processes and accumulated damage calculates: by filtered loading spectrum
Carry out rain-flow counting process, obtain journey to count results.According to Fatigue Summation Damage Theory, by count results pair
The chassis part standard S-N curve that should build carries out accumulative total damage measurement.
4, chassis member block spectrum loading amplitude and equivalent damage cycle-index determine: determine count results figure from journey
The load amplitude of block spectrum, the total impairment value of accumulation that the total damage of accumulation using test site loading spectrum is composed as block, for
Identical standard S-N curve carries out the equivalent damage cycle-index of corresponding load amplitude and determines.
5, chassis member equivalent block spectrum is evaluated: composes equivalent block by the amplitude determined and cycle-index, carries out chassis
The CAE fatigue endurance of part is analyzed, and the analysis result corresponding with chassis member test site loading spectrum compares, really
Recognize the concordance of dangerous position and fatigue damage.
See Fig. 2-Fig. 6, below with swing arm as example, in conjunction with accompanying drawing, the enforcement of the present invention is made specifically
Bright:
1, SWING ARM TEST field loading spectrum data acquisition
Swing arm is primarily subjected to longitudinal loading and transverse load in the road, before at ball stud axle journal, edge is longitudinal
Rear surface, surface, horizontal left and right paste foil gauge R1, R3 and R2, R4 respectively, as in figure 2 it is shown, R1 and
R3, R2 and R4 also separately constitute two strain half-bridge test bridges, table before and after wherein R1 and R3 is longitudinally
Foil gauge is pasted in face, R2 and R4 is horizontal left and right surface mount foil gauge, completes at swing arm ball pin with car load
The longitudinally, laterally collection of test site strain spectrum, the calibration coefficient obtained by early stage rating test can directly be changed
Obtain vertical and horizontal test site loading spectrum data corresponding at swing arm ball pin.
2, loading spectrum KLT road surface, SWING ARM TEST field RP filtering
SWING ARM TEST field loading spectrum data are imported in the software with RP filter function, each passage is set
The load threshold values of load related quantities is the 10% of each passage maximum load scope, carries out test site loading spectrum
Data reduction, filters not damaged data, makes each passage load data keep on the basis of original damage,
Reduction load data amount to greatest extent.
Result is as it is shown on figure 3, raw payload modal data is within being reduced to 20 seconds in more than 2100 seconds, greatly
Shorten greatly CAE simulation time, improve cae analysis efficiency.
3, each passage loading spectrum rain-flow counting processes and accumulated damage calculates
The loading spectrum data of reduction are carried out rain-flow counting process, obtains journey to count results, such as Fig. 4
Shown in.
According to the material properties of steel, build swing arm standard S-N curve computing formula as follows:
Wherein K=5, for the S-N slope of curve；S0=1000, N0=107, for S-N slope of curve flex point
The load value of place's correspondence and corresponding cycle to failure；N is that load S effect lower swing arm occurs inefficacy corresponding
Period.
Journey is bent according to respective load amplitude S correspondence S-N to each group of enumeration data in count results
Line formula calculates each self-corresponding cycle to failure N, by the counting aggregate-value i.e. cycle-index of these group data
N, according to Cumulative Fatigue Damage principle, uses to step and receives Cumulative Fatigue Damage criterion and calculate it and always damage, meter
Calculating n time and following the damage of generation is n/N, and total damage that counting is produced by journey is: DAlways=∑ Di, such as Fig. 5
Shown in.Mode calculates the corresponding total damage of other passage accordingly.
In Fig. 5, S0Correspondence load amplitude at S-N slope of curve flex point, N0—S0Corresponding cycle to failure,
n1/n2The counting cycle-index of the 1/2nd group of enumeration data, S1/S2—n1/n2Corresponding load amplitude, N1/N2
—S1/S2Corresponding cycle to failure, D1/D2—n1/n2The damage that cycle-index correspondence produces, DiI-th
Group enumeration data correspondence produce damage, DAlwaysTotal damage of enumeration data.
4, each passage block spectrum loading amplitude and equivalent damage cycle-index determine
From journey to count results figure is found out each passage maximum load value range, take its half as each passage
The load amplitude S of equivalent block spectrum, is calculated each passage correspondence load amplitude S's by S-N curve equation
Cycle to failure N, with previous step each passage calculated corresponding always damage DAlwaysAs each passage
The total impairment value of accumulation of corresponding blocks spectrum, uses formula DAlways=n/N calculates, available each passage corresponding blocks spectrum
Equivalent damage cycle-index n.
5, block spectrum is evaluated
The each passage equivalent block spectrum that will obtain, input swing arm CAE model carries out fatigue endurance analysis, with swing arm
Test site loading spectrum analysis result compares, and as shown in Figure 6, (a) is test site loading spectrum CAE to result
Analysis result, (b) is that equivalent block composes cae analysis result.
It can be seen that no matter both results are consistent on dangerous position and the impairment value order of magnitude, knot thus can be drawn
Opinion, it is equivalent for composing with former test site loading spectrum by the block obtained by the inventive method.
Claims (4)
1. a loading analysis method for chassis member, comprises the following steps:
(1) chassis member test site loading spectrum data acquisition；
(2) chassis member test site loading spectrum key fatigue damage life test (KLT) road surface filtering: process by carrying out rain stream projection filtering (RP filtering), filter not damaged data；
(3) loading spectrum rain-flow counting in chassis member test site processes and accumulated damage calculates: filtered loading spectrum is carried out rain-flow counting process, obtains journey to count results；According to Fatigue Summation Damage Theory, the chassis part standard S-N curve that count results correspondence builds is carried out accumulative total damage measurement；
(4) chassis member block spectrum loading amplitude and equivalent damage cycle-index determine: from journey to determining the load amplitude that block is composed count results figure, the total damage of accumulation using test site loading spectrum is as the total impairment value of accumulation of block spectrum, and the equivalent damage cycle-index carrying out corresponding load amplitude for identical standard S-N curve determines；
(5) chassis member equivalent block spectrum is evaluated.
The loading analysis method of chassis member the most according to claim 1, it is characterized in that, the chassis member test site loading spectrum data acquisition of described step (1) is to arrange strain testing bridge according to load condition suffered by chassis member reality, complete the collection of chassis member test site strain spectrum with car load, chassis member test site loading spectrum can be directly obtained by nominal data information.
The loading analysis method of chassis member the most according to claim 1, it is characterised in that described step (3) is to use Cumulative Fatigue Damage criterion of receiving advanced in years to calculate total damage.
The loading analysis method of chassis member the most according to claim 1, it is characterized in that, the chassis member equivalent block spectrum evaluation of described step (5) is: compose equivalent block by the amplitude determined and cycle-index, carry out the CAE fatigue endurance analysis of chassis member, the analysis result corresponding with chassis member test site loading spectrum compares, and confirms dangerous position and the concordance of fatigue damage.
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107807056A (en) * | 2017-10-23 | 2018-03-16 | 上海理工大学 | A kind of auto parts and components lesion assessment system based on acceleration loading spectrum |
| CN108152053A (en) * | 2017-12-26 | 2018-06-12 | 北京理工大学 | A kind of method of the automobile load spectrum discrimination based on axle structure stress test |
| CN108959795A (en) * | 2018-07-16 | 2018-12-07 | 上海理工大学 | A kind of test site loading spectrum standardized method |
| CN109029884A (en) * | 2018-06-29 | 2018-12-18 | 江铃汽车股份有限公司 | A kind of method of vehicle cantilever structural member vibrating fatigue analysis |
| CN109977459A (en) * | 2019-02-11 | 2019-07-05 | 中国第一汽车股份有限公司 | A method of it is improved using CAE technology and strengthens loading spectrum precision |
| CN110069875A (en) * | 2019-04-28 | 2019-07-30 | 江铃汽车股份有限公司 | A kind of generation method of the load modal data of dynamic load emulation |
| CN110861784A (en) * | 2019-12-04 | 2020-03-06 | 中国直升机设计研究所 | Calculation and monitoring method for fatigue accumulation damage of helicopter flight test load |
| CN110895195A (en) * | 2019-12-31 | 2020-03-20 | 东风汽车集团有限公司 | Method for obtaining durability test load of front lower swing arm rack |
| CN111967131A (en) * | 2020-07-08 | 2020-11-20 | 中国第一汽车股份有限公司 | Method for compiling actual measurement load power assembly suspension load spectrum based on test field endurance road |
| CN112051072A (en) * | 2020-08-25 | 2020-12-08 | 中国第一汽车股份有限公司 | Finished automobile test method for looseness of chassis fastener of suspension and brake system |
| CN112100563A (en) * | 2020-09-11 | 2020-12-18 | 广州汽车集团股份有限公司 | Multi-axis load equivalent processing method and device, computer equipment and medium |
| CN112229654A (en) * | 2020-09-30 | 2021-01-15 | 湖南行必达网联科技有限公司 | Plate spring test method, device, electronic equipment and computer readable medium |
| CN112434367A (en) * | 2019-08-22 | 2021-03-02 | 广州汽车集团股份有限公司 | Method and device for acquiring fatigue load spectrum of automobile suspension |
| CN112595537A (en) * | 2020-12-17 | 2021-04-02 | 弥伦工业产品设计(上海)有限公司 | Equipment health state monitoring method and system based on signal analysis and storage medium |
| CN113092288A (en) * | 2019-12-23 | 2021-07-09 | 观致汽车有限公司 | Fatigue test method for rear suspension mounting point |
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Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107807056A (en) * | 2017-10-23 | 2018-03-16 | 上海理工大学 | A kind of auto parts and components lesion assessment system based on acceleration loading spectrum |
| CN108152053A (en) * | 2017-12-26 | 2018-06-12 | 北京理工大学 | A kind of method of the automobile load spectrum discrimination based on axle structure stress test |
| CN109029884A (en) * | 2018-06-29 | 2018-12-18 | 江铃汽车股份有限公司 | A kind of method of vehicle cantilever structural member vibrating fatigue analysis |
| CN108959795A (en) * | 2018-07-16 | 2018-12-07 | 上海理工大学 | A kind of test site loading spectrum standardized method |
| CN108959795B (en) * | 2018-07-16 | 2022-12-27 | 上海理工大学 | Test field load spectrum standardization method |
| CN109977459A (en) * | 2019-02-11 | 2019-07-05 | 中国第一汽车股份有限公司 | A method of it is improved using CAE technology and strengthens loading spectrum precision |
| CN110069875A (en) * | 2019-04-28 | 2019-07-30 | 江铃汽车股份有限公司 | A kind of generation method of the load modal data of dynamic load emulation |
| CN112434367A (en) * | 2019-08-22 | 2021-03-02 | 广州汽车集团股份有限公司 | Method and device for acquiring fatigue load spectrum of automobile suspension |
| CN110861784A (en) * | 2019-12-04 | 2020-03-06 | 中国直升机设计研究所 | Calculation and monitoring method for fatigue accumulation damage of helicopter flight test load |
| CN113092288A (en) * | 2019-12-23 | 2021-07-09 | 观致汽车有限公司 | Fatigue test method for rear suspension mounting point |
| CN110895195A (en) * | 2019-12-31 | 2020-03-20 | 东风汽车集团有限公司 | Method for obtaining durability test load of front lower swing arm rack |
| CN110895195B (en) * | 2019-12-31 | 2021-04-27 | 东风汽车集团有限公司 | Method for obtaining durability test load of front lower swing arm rack |
| CN111967131A (en) * | 2020-07-08 | 2020-11-20 | 中国第一汽车股份有限公司 | Method for compiling actual measurement load power assembly suspension load spectrum based on test field endurance road |
| CN111967131B (en) * | 2020-07-08 | 2023-04-07 | 中国第一汽车股份有限公司 | Method for compiling actual measurement load power assembly suspension load spectrum based on test field endurance road |
| CN112051072A (en) * | 2020-08-25 | 2020-12-08 | 中国第一汽车股份有限公司 | Finished automobile test method for looseness of chassis fastener of suspension and brake system |
| CN112100563A (en) * | 2020-09-11 | 2020-12-18 | 广州汽车集团股份有限公司 | Multi-axis load equivalent processing method and device, computer equipment and medium |
| CN112100563B (en) * | 2020-09-11 | 2024-04-19 | 广州汽车集团股份有限公司 | Multi-axis load equivalent processing method, device, computer equipment and medium |
| CN112229654A (en) * | 2020-09-30 | 2021-01-15 | 湖南行必达网联科技有限公司 | Plate spring test method, device, electronic equipment and computer readable medium |
| CN112595537A (en) * | 2020-12-17 | 2021-04-02 | 弥伦工业产品设计(上海)有限公司 | Equipment health state monitoring method and system based on signal analysis and storage medium |
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