CN104655435A - Longitudinal multi-level spectrum loading test bed provided with control arm assembly and used for auxiliary frame as well as test method adopting test bed - Google Patents
Longitudinal multi-level spectrum loading test bed provided with control arm assembly and used for auxiliary frame as well as test method adopting test bed Download PDFInfo
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Abstract
The invention discloses a longitudinal multi-level spectrum loading test bed provided with a control arm assembly and used for an auxiliary frame as well as a test method adopting the test bed. The test bed comprises a first combination support used for fixing the auxiliary frame and two drivers used for applying load to ball pins on control arms on two sides of the auxiliary frame, wherein the drivers are connected with the ball pins through ball pin loading clamps, and the ball pin loading clamps are connected with guide clamps. According to the longitudinal multi-level spectrum loading test bed provided with the control arm assembly and used for the auxiliary frame as well as the test method adopting the test bed, the road test stress condition can be reflected, fatigue performance of parts under different loads is considered, a road test failure mode is reproduced, so that operational features of the parts and test load spectrums of a testing field can be reflected more truly, and the test precision is higher than that of constant amplitude loading; meanwhile, test frequency is controlled through damage equivalence, the test period is greatly shortened, the test efficiency is improved, and early-stage development and verification of the parts are facilitated.
Description
Technical field
The invention belongs to automobile product technical field of measurement and test, specifically, the present invention relates to a kind of multistage spectrum of longitudinal direction (calling Block loading spectrum in the following text) load test stand and test method thereof of subframe band control arm assembly.
Background technology
At present, passenger car fore sub frame Durability Test adopts constant amplitude to load and random loading two kinds of modes mostly.Wherein random loading torture test can be good at reproduction road examination loading conditions, more close with reality, but because its test period is long, cost is high, is generally unsuitable for the early development of part.And constant amplitude loading fatigue test be a kind of the most fast, the most simply, the most directly, cost is minimum, applying frequency is also the highest testing laboratory's Bench test methods, but it also has some limitations, because load is single, the loading conditions of road examination can not be embodied, also just can not embody the fatigue behaviour of part under different loads; Overload once in a while may cause part to produce plastic yield in high stress concentrations region, causes redistributing of stress, and unrelieved stress can affect the fatigue behaviour of whole part simultaneously.
Summary of the invention
Technical matters to be solved by this invention is to provide a kind of longitudinal direction multistage spectrum load test stand and test method thereof of subframe band control arm assembly, shortens the test period, improves test efficiency and test accuracy.
In order to solve the problems of the technologies described above, the technical solution adopted in the present invention is: the longitudinal direction multistage spectrum load test stand of subframe band control arm assembly, comprise for the first sectional shelf-unit of fixed joint vehicle frame and on the control arm to subframe both sides two drivers of set ball pin imposed load, driver loads fixture by ball pin and is connected with ball pin, and ball pin loads fixture and is connected with guiding fixture.
Described driver is hydraulic cylinder, and piston rod and the described ball pin of hydraulic cylinder load fixture and be connected, and cylinder body and first bearing of hydraulic cylinder are rotationally connected.
Two described hydraulic cylinders for be arrangeding in parallel, and are positioned at the same side of described first sectional shelf-unit.
Described first sectional shelf-unit comprises the first rack body and to be located on the first rack body and fixed head for being connected with subframe.
Described guiding fixture comprises the second bearing and is located at the support bar on the second bearing, and support bar one end and described ball pin load fixture and be rotationally connected, and the other end and the second bearing are rotationally connected.
Described second bearing is positioned at the below that described ball pin loads fixture.
Present invention also offers a kind of longitudinal direction multistage spectrum load test method of subframe band control arm assembly, adopt above-mentioned test-bed, comprise the steps:
Determine Block loading spectrum;
According to Block loading spectrum, control two driver actions, carry out torture test.
Determine that Block loading spectrum comprises step:
(1.1) rain stream statistics, obtains strain Range-Mean matrix;
(1.2) utilize ball pin load-strain calibration coefficient that strain matrix is changed into loading matrix;
(1.3) loading matrix average is revised;
(1.4) testing field one is enclosed the statistics frequency and be extrapolated to the whole testing field frequency, and utilize normal distribution to be extrapolated to the test frequency of 95% degree of confidence;
(1.5) equivalent damage is utilized to be transformed in the large load of the low frequency by the side crops industry of high frequency time, and by the medium load Partial Conversion of relatively high frequency time in large load, control load rank is at 6 to 8 grades, the overall test frequency is in 30 ten thousand to 50 ten thousand times, repetitive cycling is no less than 10 times, determines with this Block loading spectrum that X transforms to signal;
(1.6) by same side X, the contrast of Y-direction signal impairment, the Block loading spectrum circulation frequency that X transforms to signal increases the cycle index of corresponding proportion, determines final Block loading spectrum.
The longitudinal direction multistage spectrum load test stand of subframe band control arm assembly of the present invention and test method thereof, road examination stressing conditions can be embodied, consider the fatigue behaviour of part under different loads, and reappear road examination failure mode, thus the operating characteristic of part and the loading spectrum of proving ground test can be reflected more truly, so test accuracy loads higher than constant amplitude, simultaneously by the equivalent damage Control experiment frequency, substantially reduce the test period, improve test efficiency, be conducive to the early development checking of part.
Accompanying drawing explanation
Fig. 1 is Block load determination process flow diagram of the present invention;
Fig. 2 is the structural representation of test-bed of the present invention;
Mark in above-mentioned figure is: 1, hydraulic cylinder; 2, ball pin loads fixture; 3, the first bearing; 4, lead fixture; 41, the second bearing; 42, support bar; 5, the first sectional shelf-unit; 51, the first rack body; 52, fixed head; 6, the second sectional shelf-unit; 7, ball pin; 8, subframe; 9, control arm.
Embodiment
Contrast accompanying drawing below, by the description to embodiment, be described in further detail the specific embodiment of the present invention, object helps those skilled in the art to have more complete, accurate and deep understanding to design of the present invention, technical scheme, and contribute to its enforcement.
As shown in Figure 2, the invention provides a kind of longitudinal direction multistage spectrum load test stand of subframe band control arm assembly, subframe band control arm assembly is made up of subframe, two control arms and two ball pins, two control arms are connected with subframe in the side of subframe respectively, and two ball pins are located on a control arm respectively.This test-bed comprise for the first sectional shelf-unit of fixed joint vehicle frame and on the control arm to subframe both sides two drivers of set ball pin imposed load, driver loads fixture by ball pin and is connected with ball pin, and ball pin loads fixture and is connected with guiding fixture.
As shown in Figure 2, as preferably, driver is hydraulic cylinder, and piston rod and the ball pin of hydraulic cylinder load fixture and be fixedly connected with, and cylinder body and first bearing of hydraulic cylinder are rotationally connected.Two hydraulic cylinders for be arrangeding in parallel, and are positioned at the same side of the first sectional shelf-unit.Two the first bearings are positioned at sustained height, and two hydraulic cylinders are coaxial with the rotation centerline of the first bearing.Two the first bearings, for being fixedly installed, can be fixed on the holder of setting in addition as on column or support.
As shown in Figure 2, the first sectional shelf-unit comprises two the first rack bodies and to be located on each first rack body and fixed head for being connected with subframe.When fixed joint vehicle frame, two mounting points be connected with vehicle body possessed by subframe rear end are fixedly connected with two fixed heads.Under state shown in Fig. 2, two the first rack bodies are vertically arrange, and two fixed heads are for stretch out in the horizontal direction, and subframe band control arm assembly is the horizontal side at the first sectional shelf-unit of level.Second sectional shelf-unit is between the first sectional shelf-unit and guiding fixture, and the second sectional shelf-unit is also for fixed joint vehicle frame, and two mounting points be connected with vehicle body that the second sectional shelf-unit possesses in the below of subframe and subframe front end are fixedly connected with.
As shown in Figure 2, the structure that ball pin loads fixture is known as professional, and ball pin loads fixture blunt end and is fixedly connected with the piston rod of hydraulic cylinder, and both are coaxial, and ball pin loads the square toes end of fixture for connecting ball pin.
As shown in Figure 2, guiding fixture comprises the second bearing and is located at the support bar on the second bearing, and one end of support bar and ball pin load fixture and be rotationally connected, and the other end and the second bearing are rotationally connected.Due to ball pin load fixture be provided with two, then lead fixture be also provided with two, loads fixture with a ball pin respectively and is connected, lead fixture the second bearing and be positioned at ball pin loading fixture below.
Position-limiting action is played in the effect of guiding fixture, and keep ball pin to load fixture at horizontal movement state, institute's loading force is all applied in ball pin.
As preferably, two hydraulic cylinders are connected with PID controller, are to be controlled to carry out action by PID controller.At the trial, set up platform by MTS platform and set up two hydraulic cylinder associating platforms, and regulate the pid value of two hydraulic cylinders.MTS (Servohydraulic Test System) servo hydraulic system sets up two hydraulic cylinder syndication platforms, in MTS control inerface, pid value is set, it acts on the relation of main regulating command and feedback, best effect be make displacement, power, acceleration value of feedback close with bid value size, waveform similarity or consistent, no matter torture test adopts constant amplitude to compose loads or random spectrum loading, all needs to regulate pid value.
Present invention also offers a kind of longitudinal direction multistage spectrum load test method of subframe band control arm assembly, adopt the test-bed of said structure, comprise the steps:
Determine Block loading spectrum;
According to Block loading spectrum, control two driver actions, carry out torture test.
In above-mentioned experimental technique, determine that the process of Block loading spectrum comprises the steps:
(1.1) rain stream statistics, obtains strain Range-Mean matrix;
Utilize Glyphworks to carry out rain stream statistics to the X that Mei Duan road, passenger car fore sub frame ball pin testing field gathers to signal, obtain strain Range-Mean matrix;
Glyphworks is the engineering software system of a data acquisition without the need to customization, data processing, report generation, can change magnanimity raw data into useful information.Known as professional, utilize Glyphworks to data zero-suppress drift, check data whether abnormal, shear, compression, calculate some process of damage, rain stream statistics etc., in engineering reality, the process of image data is had a wide range of applications.
(1.2) utilize ball pin load-strain calibration coefficient that strain matrix is changed into loading matrix;
(1.3) utilize the longitudinal F-N parameter of curve of subframe and not Lip river (or Gourde(G) is graceful) method of mean value modification loading matrix average is revised, by amplitude R=-1 load such as Range value change into;
(1.4) testing field one is enclosed the statistics frequency and be extrapolated to the whole testing field frequency, and utilize normal distribution to be extrapolated to the test frequency of 95% degree of confidence;
(1.5) equivalent damage is utilized to be transformed in the large load of the low frequency by the side crops industry of high frequency time, and by the medium load Partial Conversion of relatively high frequency time in large load, control load rank is at 6 to 8 grades, the overall test frequency is in 30 ten thousand to 50 ten thousand times, repetitive cycling is no less than 10 times, determines with this Block loading spectrum that X transforms to signal;
(1.6) by same side X, the contrast of Y-direction signal impairment, the Block loading spectrum circulation frequency that X transforms to signal increases the cycle index of corresponding proportion, determines final Block loading spectrum.
According to above final Block loading spectrum, corresponding test routine is set in MTS Hydrauservo System test is controlled, and corresponding protection is set.Detailed process is: the syndication platform setting up two hydraulic cylinders, at MTS operation interface, a circulation group is set, the cycle index of circulation group is the highest common factor of each substep cycle index, under circulation group, each step is circularly set and comprises magnitude of load, cycle index, frequency, two hydraulic cylinder synchronous motions, each step circulation is all so arranged, finally just set each step according to circulation group to run, it is equidirectional for controlling two hydraulic cylinders, same size, same frequency moves, two hydraulic cylinder synchronous are stretched, ball pin is loaded, until run the number of times of circulation group setting, torture test just terminates.
Counterdie transforms Block loading spectrum for Xiangyang 30,000 passenger car fore sub frame ball pin collection signal and illustrates.
1, rain stream statistics:
Relatively left and right ball pin signal impairment size, gets larger side ball pin signal and adds up.Get the three ring signals identical Range value of statistical guarantee simultaneously, feature 1 tunnel ball pin X is as shown in the table to strain matrix statistics:
Table 1. feature 1 road X is to three circle strain matrix statistical forms
2, according to ball pin strain-load calibration coefficient, strain matrix is converted into loading matrix, as shown in the table:
Table 2. feature 1 road X is to three circle loading matrix statistical forms
3, average correction and the corresponding frequency of each circle load calculate:
Utilize above Range-Mean value loading matrix and F-N curve to every number of turns according to carrying out damage measurement, utilize not Lip river (Morrow) mean stress correction formula, the damage corresponding to load at different levels is revised.In process, negative average load is changed into positive average load, process is because the polarity of load and the stress sign of critical localisation have nothing to do like this, and process is relatively conservative like this.As shown in table 3 below:
Statistical damage table after the average correction of table 3. feature 1 tunnel
4, according to respectively enclosing load-damage and correspondence statistics fatigue lifetime above, the test frequency corresponding under calculating each circle load at different levels, as shown in table 4 below:
The test frequency statistics table corresponding to load at different levels is respectively enclosed on table 4. feature 1 tunnel
| Amplitude (kN) | 0.411 | 1.100 | 1.790 | 2.479 | 3.169 | 3.858 | 4.548 | 5.237 |
| C1 | 32171.4 | 292.1383 | 375.1945844 | 1139.414 | 407.6995 | 50.73421 | 8.910811 | 0.97868 |
| C2 | 30760.1 | 330.201 | 383.8720889 | 1166.939 | 366.3896 | 41.92609 | 16.84294 | 1.983033 |
| C3 | 31510.4 | 309.3715 | 363.1675051 | 1145.483 | 403.7786 | 50.0636 | 8.034821 | 0.97868 |
5, extrapolate:
The test frequency of feature 1 tunnel one circle only added up by table 4, and in the car load long duration test that whole Xiangyang 30,000 is comprehensive feature 1 tunnel to carry out altogether 8 × 64 circle, therefore the statistics frequency of 3 above ring signals being expanded to 8 × 64 circles, all the other enclose as feature 2 road and the frequency statistics of Billy's time channel also extend to 6 × 64 circles and 4 × 64 respectively as feature 1 road.And suppose that the collection signal Normal Distribution of often enclosing is tried on road, then can count the test frequency in each section confidence level whole Xiangyang corresponding under each load rank 95% time, statistical form is as shown in table 5 below:
Table 5. Xiangyang 30,000 X postpones the test frequency and statistical damage table outside load
6, the equivalent damage Control experiment frequency:
Low amplitude high frequency is secondary and that the middle amplitude frequency is relatively high load is transformed in the less load of the amplitude frequency by damage equivalent principle, and do not consider the damage profile after transforming, the test frequency is controlled between 30 to 50 ten thousand times, and computing formula is as follows:
In above formula, EstCount
r, Mfor transforming the global cycle number of times of rear target load; Dam
clumpfor transforming after load injury and target load damage; Damage
r, Mfor transforming the damage of front target load; Counts
r, Mfor transforming front target load cycle index.
Block load statistical form after transforming by above formula is as shown in table 6 below:
Block load after table 6. equivalent damage transforms and cycle index statistical form
Through statistics, the ball pin Y-direction damage of comprehensive left side, this fore sub frame Xiangyang 30,000 for X to 0.3546 times, therefore in the cycle index of X to corresponding increase by 0.3546 times in statistics cycle index, supplementary Y-direction load can be carried out to the damage of subframe with this.Here, increase by 128 circulations of 0.3546 times on the basis of X to 30,000 128 systemic circulations in Xiangyang after, global cycle number then becomes 174 systemic circulations, specifically sees the following form shown in 7:
Table 7. is final Block loading spectrum statistical form after increasing Y-direction damage
7, MTS Hydrauservo System programming:
In MTS793MPT according on table 7 load order, the frequency and set of frequency test routine, and set protection, open test.
Above by reference to the accompanying drawings to invention has been exemplary description; obvious specific implementation of the present invention is not subject to the restrictions described above; as long as have employed the improvement of the various unsubstantialities that method of the present invention is conceived and technical scheme is carried out; or design of the present invention and technical scheme directly applied to other occasion, all within protection scope of the present invention without to improve.
Claims (8)
1. the longitudinal direction multistage spectrum load test stand of subframe band control arm assembly, it is characterized in that, comprise for the first sectional shelf-unit of fixed joint vehicle frame and on the control arm to subframe both sides two drivers of set ball pin imposed load, driver loads fixture by ball pin and is connected with ball pin, and ball pin loads fixture and is connected with guiding fixture.
2. the longitudinal direction multistage spectrum load test stand of subframe band control arm assembly according to claim 1, it is characterized in that, described driver is hydraulic cylinder, and piston rod and the described ball pin of hydraulic cylinder load fixture and be connected, and cylinder body and first bearing of hydraulic cylinder are rotationally connected.
3. the longitudinal direction multistage spectrum load test stand of subframe band control arm assembly according to claim 2, is characterized in that, two described hydraulic cylinders for be arrangeding in parallel, and are positioned at the same side of described first sectional shelf-unit.
4. the longitudinal direction multistage spectrum load test stand of subframe band control arm assembly according to claim 1, is characterized in that, described first sectional shelf-unit comprises the first rack body and to be located on the first rack body and fixed head for being connected with subframe.
5. the longitudinal direction multistage spectrum load test stand of subframe band control arm assembly according to claim 1, it is characterized in that, described guiding fixture comprises the second bearing and is located at the support bar on the second bearing, support bar one end and described ball pin load fixture and are rotationally connected, and the other end and the second bearing are rotationally connected.
6. the longitudinal direction multistage spectrum load test stand of subframe band control arm assembly according to claim 5, is characterized in that, described second bearing is positioned at the below that described ball pin loads fixture.
7. the longitudinal direction multistage spectrum load test method of subframe band control arm assembly, adopts the arbitrary described test-bed of claim 1 to 6, it is characterized in that, comprise step:
Determine Block loading spectrum;
According to Block loading spectrum, control two driver actions, carry out torture test.
8. the longitudinal direction multistage spectrum load test method of subframe band control arm assembly according to claim 7, is characterized in that, determine that Block loading spectrum comprises step:
(1.1) rain stream statistics, obtains strain Range-Mean matrix;
(1.2) utilize ball pin load-strain calibration coefficient that strain matrix is changed into loading matrix;
(1.3) loading matrix average is revised;
(1.4) testing field one is enclosed the statistics frequency and be extrapolated to the whole testing field frequency, and utilize normal distribution to be extrapolated to the test frequency of 95% degree of confidence;
(1.5) equivalent damage is utilized to be transformed in the large load of the low frequency by the side crops industry of high frequency time, and by the medium load Partial Conversion of relatively high frequency time in large load, control load rank is at 6 to 8 grades, the overall test frequency is in 30 ten thousand to 50 ten thousand times, repetitive cycling is no less than 10 times, determines with this Block loading spectrum that X transforms to signal;
(1.6) by same side X, the contrast of Y-direction signal impairment, the Block loading spectrum circulation frequency that X transforms to signal increases the cycle index of corresponding proportion, determines final Block loading spectrum.
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Cited By (7)
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| CN106081157A (en) * | 2016-06-17 | 2016-11-09 | 中国飞机强度研究所 | A kind of vertical following loading device |
| CN107290150A (en) * | 2017-05-18 | 2017-10-24 | 奇瑞汽车股份有限公司 | The vertical multistage spectrum test-bed of engine mounting assembly and its test method |
| CN107505130A (en) * | 2017-09-19 | 2017-12-22 | 中国第汽车股份有限公司 | Frame assembly torsional fatigue load test stand and test method |
| CN108303277A (en) * | 2018-04-10 | 2018-07-20 | 贵安新区新特电动汽车工业有限公司 | Control arm assembly sluggishness detection device and its detection method |
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| CN110907201A (en) * | 2019-11-15 | 2020-03-24 | 华南理工大学 | Universal auxiliary frame fatigue test rack |
| CN111521407A (en) * | 2020-04-30 | 2020-08-11 | 广西汽车集团有限公司 | Method for formulating test load of auxiliary frame bench |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106092601B (en) * | 2016-05-30 | 2018-11-20 | 广州汽车集团股份有限公司 | A kind of bench test loading device |
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| CN107505130A (en) * | 2017-09-19 | 2017-12-22 | 中国第汽车股份有限公司 | Frame assembly torsional fatigue load test stand and test method |
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| CN108303277A (en) * | 2018-04-10 | 2018-07-20 | 贵安新区新特电动汽车工业有限公司 | Control arm assembly sluggishness detection device and its detection method |
| CN110907201A (en) * | 2019-11-15 | 2020-03-24 | 华南理工大学 | Universal auxiliary frame fatigue test rack |
| CN111521407A (en) * | 2020-04-30 | 2020-08-11 | 广西汽车集团有限公司 | Method for formulating test load of auxiliary frame bench |
| CN111521407B (en) * | 2020-04-30 | 2022-05-20 | 广西汽车集团有限公司 | Method for formulating test load of auxiliary frame bench |
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Application publication date: 20150527 |