CN102798508A - Accelerated endurance test method for catalytic converter assembly of commercial vehicle - Google Patents
Accelerated endurance test method for catalytic converter assembly of commercial vehicle Download PDFInfo
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- CN102798508A CN102798508A CN201110141949XA CN201110141949A CN102798508A CN 102798508 A CN102798508 A CN 102798508A CN 201110141949X A CN201110141949X A CN 201110141949XA CN 201110141949 A CN201110141949 A CN 201110141949A CN 102798508 A CN102798508 A CN 102798508A
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Abstract
The invention discloses an accelerated endurance test method for a catalytic converter assembly of a commercial vehicle. The method comprises the steps of: collecting time domain acceleration signals by using a test track road based on a principle of same failure mode and equivalent damages; carrying out synthesis and accelerated computing to obtain an acceleration power spectral density (PSD) so as to guide an electromagnetic vibration bench to carry out a frequency domain accelerated test method of random vibration on the catalytic converter assembly. By using the method, vibration bench tests and test track road tests are correlated; because of the same failure mode and equivalent damages, the test time is greatly shortened, the endurance development cycle of a product is reduced, and the test cost is lowered; and the accelerated endurance test method has the three remarkable advantages of economy, practicability and accuracy.
Description
Technical field
The present invention relates to a kind of test method, particularly a kind of commercial car catalyst converter converter assembly quickens the long duration test method.
Background technology
Advantages such as selectivity catalytic converter SCR (Selective Catalytic Reduction) technology has can reduce NOx, improve fuel consume, the sulfur poisoning-resistant ability is strong are that high-power diesel engine reaches the comparatively ideal approach of NOx emission request in state IV and the state V standard so the SCR after-treatment system is installed.But volume is big, quality is big for catalytic converter assembly (SCR box), cost an arm and a leg, and in the automobile use, receives the vibration of engine, the vibration and the high temperature on road surface, and environment for use is very abominable, so require very high to durability Design.In order to improve durability of product, shortening product development cycle and to reduce cost, need carry out stand usually and quicken long duration test.Traditional acceleration long duration test method on the engineering is that test load spectrum is concentrated or strengthens; To reach the purpose that shortens test period; Wherein there are a lot of uncertainties; Such as: concentrate and to cause losing of fractional load damage, reinforcement possibly cause the change and the test period of unusual big signal, failure mode can't be related with the skid pad.Traditional method all is difficult to accomplish to confirm the quantification contrast of damage.Therefore, error is the obvious deficiency that tradition is quickened the long duration test method with uncertainty greatly.If it is accurately related with skid pad road long duration test to realize that stand quickens long duration test, just can estimate the permanance of catalytic converter assembly more exactly through the stand accelerated test.The more important thing is that commercial car catalytic converter assembly is made up of parts such as carrier, liner, noise-reducing structure and inner auxiliary stands, so existingly usually single part is carried out the long duration test method and obviously be difficult to accurately estimate its endurance quality.
Summary of the invention
The object of the invention; Be to provide a kind of commercial car catalyst converter converter assembly to quicken the long duration test method; This method is a kind of based on the identical principle equivalent with damage of failure mode; Utilize the skid pad road to gather that the time domain acceleration signal is synthetic, speed-up computation obtains acceleration power spectral density (Power Spectral Density is called for short PSD), instruct electromagnetic vibration generator system the catalytic converter assembly to be carried out the frequency domain accelerated test method of random vibration.
The objective of the invention is to realize like this: a kind of commercial car catalyst converter converter assembly quickens the long duration test method, may further comprise the steps:
(i) according to installation site and the stress of commercial car catalytic converter assembly at automobile chassis; Set up the single-mode system model of vibration of this catalytic converter assembly; Vibration input position in single-mode system is pasted 3-axis acceleration sensor, gathers the acceleration signal on various long duration tests road surface then according to requirement of client at proving ground;
(ii) calculate shock response spectrum; The hypothesis that on automobile chassis, belongs to single-mode system based on the catalytic converter assembly; With this single-mode system each frequency under road load excitation all as its natural frequency; With the response load of vibration input position each frequency under road load of this single-mode system excitation load as total system; Calculate this single-mode system receives same excitation load under different natural frequencies response results, the maximal value of these response curves is done an envelope, promptly obtain the shock response spectrum of this single-mode system;
(iii) calculate frequency domain fatigue damage spectrum; At first the road acceleration spectrum of gathering is damaged calculating; Calculate signal collected frequency domain fatigue damage spectrum; Then the frequency domain fatigue damage spectrum of the roadway sign of various operating modes is accumulated, obtain the total frequency domain fatigue damage spectrum of this single-mode system on the client road surface;
(iv) after calculating the total frequency domain fatigue damage spectrum of single-mode system on the client road surface, based on damage equivalent principle and frequency domain accelerator theory, the chamber of making an experiment vibrates the synthetic of bench test acceleration power spectral density and test speed-up computation; For fear of excessive acceleration; Must test to the vibration bench test acceleration power spectral density after synthetic and the acceleration; Be about to vibrate the bench test acceleration power spectral density and carry out the calculating of peak response spectrum, this value should be not more than shock response spectrum in principle, otherwise explanation vibration bench test acceleration power spectral density is quickened excessive; This will cause and produce unpractical overload phenomenon in the test, possibly change the failure mode of product;
(the vibration bench test acceleration power spectral density inputted vibration platform after v) will speed up carries out the vibration long duration test of commercial car catalytic converter assembly according to the test period of quickening, and estimates the endurance quality of whole parts fast.
Step wherein (i) comprises substep: the acceleration signal of proving ground collection is carried out pre-service, remove burr, drift and other abnormal signal.
Step wherein (ii) comprises substep: the selection of vibration frequency range.
Step wherein (iii) comprises substep: according to the skid pad long duration test standard of client about this vehicle; The S-N slope of a curve is calculated in damage; Calculate the proportioning of various road conditions; According to the Minor rule fatigue damage of various road conditions spectrum is added up in the proportioning ratio again, obtain total acceleration power spectral density of being complementary with skid pad long duration test standard, and obtain total test period.
Step wherein (v) comprise substep: select and synthetic calculating, and test temperature is confirmed by vibration tong design, test direction.
Commercial car catalyst converter converter assembly of the present invention quickens the long duration test method and compares with existing test method, has the following advantages and characteristics:
(a) relevance, accuracy good: this method has realized that testing laboratory's vibration bench test is accurately related with the skid pad actual road test, has improved relevance and the accuracy of quickening long duration test.
(b) practical: test procedure is clear; Simple to operation; Utilize the data processing software and the electromagnetic vibration generator system of skid pad road data, main flow to accomplish, main engine plants all possess these basic capacities with the automobile exhaust system company that possesses research and development ability at present.The method has solved commercial car catalytic converter assembly (SCR Box) permanance exploitation difficult problem that always perplexs the slip-stick artist, for system structure design provides reliable verification method, has guaranteed product quality.
(c) economy is outstanding: utilize this method to carry out bench test, process of the test is quickened greatly, has shortened product development cycle, has reduced cost of development.
Description of drawings
Fig. 1 is the single-mode system model of catalytic converter assembly;
Fig. 2 is the installation site of catalytic converter assembly on automobile chassis;
Fig. 3 is a catalytic converter assembly stand accelerated test PSD calculation process;
Fig. 4 is the time domain acceleration signal;
Fig. 5 is a shock response spectrum;
Fig. 6 is the fatigue damage spectrum;
Fig. 7 is tired total damage spectrum;
Fig. 8 is the bench test acceleration power spectral density contrast before and after quickening;
Fig. 9 is the peak response spectrum of bench test acceleration power spectral density and the contrast of road spectrum shock response spectrum maximal value envelope;
Figure 10 is bench test clamping figure.
Embodiment
Below in conjunction with accompanying drawing and instantiation, the present invention is described further.
Referring to Fig. 1 and Fig. 2; Because catalytic converter assembly SCR Box directly is suspended on the chassis by bandage and support, regards SCR Box as an integral body, meets single-mode system (Single Degree of Freedom; Abbreviation SDOF) condition of supposing is suitable for the frequency domain accelerator theory.Applying frequency domain accelerator theory in conjunction with Fig. 3 provides is calculated SCR box bench test acceleration power spectral density (Power Spectral Density; Abbreviation PSD) calculation process, the frequency domain accelerated test method of estimating SCR box endurance quality specifically can be divided into following step:
The first step is carried out pre-service with the acceleration signal of proving ground collection, removes burr, drift and other abnormal signal, and Fig. 4 has provided the time domain acceleration signal after handling.
In second step,, calculate the shock response spectrum (SRS) and the fatigue damage spectrum (Fatigue Damage Spectrum is called for short FDS) of the various road conditions in skid pad, referring to Fig. 5 and Fig. 6 according to the SDOF model of vibration.
The 3rd step; According to the skid pad long duration test standard of client about this vehicle, calculate the proportioning of various road conditions, add up in the proportioning ratio according to the FDS spectrum of Minor rule again various road conditions; The total FDS that obtains being complementary with skid pad long duration test standard composes, and obtains total test period.Fig. 7 provides the FDS accumulation result.
In the 4th step, the synthetic calculating of FDS spectrum with total obtains bench test PSD spectrum, and quickens, and shortens test period.Fig. 8 provides bench test PSD spectrum; Following upper thread is unaccelerated bench test PSD spectrum, and test period is about 25000 hours, and reaching the standard grade is the bench test PSD spectrum after quickening; Test period is 50 hours; Test period shortens 500 times, has shortened the SCR product development cycle greatly, thereby has practiced thrift development cost.
In the 5th step, the bench test PSD spectrum after check is quickened is avoided undue the acceleration and unpractical unusual PSD signal occurred.Checkout procedure is that the SRS with various road conditions does peaked envelope and calculates; Obtain peaked SRS; Simultaneously synthetic stand PSD spectrum is carried out ERS and calculate, obtain stand PSD spectrum peak response acceleration spectrum in the SDOF system, this ERS spectrum and the SRS spectrum of maximal value envelope are made comparisons.Reasonably the ERS of accelerator bench test PSD spectrum should be greater than 1.5 times of the SRS of maximal value envelope, otherwise should think that test quickens too.The top line is the ERS of bench test PSD spectrum among Fig. 9, and the below line is the SRS of maximal value envelope, and interpreting blueprints can know that reaching the standard grade does not exceed 1.5 times that roll off the production line, and the test acceleration is described rationally, and the bench test PSD of acceleration spectrum can be used.
The 6th step imported shaking table respectively with the PSD of three directions of bench test spectrum, carried out SCR Box long duration test according to the test period of quickening, and detected the endurance quality of whole parts.Figure 10 provides bench test clamping figure.
The frequency domain accelerated test method that adopts the present invention to estimate SCR Box endurance quality carries out SCR box long duration test; Shortened test period greatly; Reduced experimentation cost; And realized that bench test is related accurately with the skid pad actual road test, guaranteed the exemplar failure mode identical with damage equivalence, that this test method has is economical, practicality and three remarkable advantages of accuracy.
Claims (5)
1. a commercial car catalyst converter converter assembly quickens the long duration test method, it is characterized in that, may further comprise the steps:
(i) according to installation site and the stress of commercial car catalytic converter assembly at automobile chassis; Set up the single-mode system model of vibration of this catalytic converter assembly; Vibration input position in single-mode system is pasted 3-axis acceleration sensor, gathers the acceleration signal on various long duration tests road surface then according to requirement of client at proving ground;
(ii) calculate shock response spectrum; The hypothesis that on automobile chassis, belongs to single-mode system based on the catalytic converter assembly; With this single-mode system each frequency under road load excitation all as its natural frequency; With the response load of vibration input position each frequency under road load of this single-mode system excitation load as total system; Calculate this single-mode system receives same excitation load under different natural frequencies response results, the maximal value of these response curves is done an envelope, promptly obtain the shock response spectrum of this single-mode system;
(iii) calculate frequency domain fatigue damage spectrum; At first the road acceleration spectrum of gathering is damaged calculating; Calculate signal collected frequency domain fatigue damage spectrum; Then the frequency domain fatigue damage spectrum of the roadway sign of various operating modes is accumulated, obtain the total frequency domain fatigue damage spectrum of this single-mode system on the client road surface;
(iv) after calculating the total frequency domain fatigue damage spectrum of single-mode system on the client road surface, based on damage equivalent principle and frequency domain accelerator theory, the chamber of making an experiment vibrates the synthetic of bench test acceleration power spectral density and test speed-up computation; For fear of excessive acceleration; Must test to the vibration bench test acceleration power spectral density after synthetic and the acceleration; Be about to vibrate the bench test acceleration power spectral density and carry out the calculating of peak response spectrum, this value should be not more than shock response spectrum in principle, otherwise explanation vibration bench test acceleration power spectral density is quickened excessive; This will cause and produce unpractical overload phenomenon in the test, possibly change the failure mode of product;
(the vibration bench test acceleration power spectral density inputted vibration platform after v) will speed up carries out the vibration long duration test of commercial car catalytic converter assembly according to the test period of quickening, and estimates the endurance quality of whole parts fast.
2. commercial car catalyst converter converter assembly according to claim 1 quickens the long duration test method; It is characterized in that; Step wherein (i) comprises substep: the acceleration signal of proving ground collection is carried out pre-service, remove burr, drift and other abnormal signal.
3. commercial car catalyst converter converter assembly according to claim 1 quickens the long duration test method, it is characterized in that step wherein (ii) comprises substep: the selection of vibration frequency range.
4. commercial car catalyst converter converter assembly according to claim 1 quickens the long duration test method; It is characterized in that; Step wherein (iii) comprises substep: according to the skid pad long duration test standard of client about this vehicle; The S-N slope of a curve is calculated in damage, calculates the proportioning of various road conditions, adds up in the proportioning ratio according to the fatigue damage spectrum of Minor rule with various road conditions again; Obtain total acceleration power spectral density of being complementary with skid pad long duration test standard, and obtain total test period.
5. commercial car catalyst converter converter assembly according to claim 1 quickens the long duration test method, it is characterized in that, step wherein (v) comprise substep: select and synthetic calculating, and test temperature is confirmed by vibration tong design, test direction.
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| CN103886868A (en) * | 2014-04-16 | 2014-06-25 | 上海其高电子科技有限公司 | Impact sound detection method and detection system |
| CN104236830A (en) * | 2014-09-12 | 2014-12-24 | 玉柴联合动力股份有限公司 | Heavy truck muffler structure service life testing device and method |
| CN106932206A (en) * | 2017-02-20 | 2017-07-07 | 上汽通用汽车有限公司 | Road spectrum processing method and device |
| CN107367364A (en) * | 2017-06-30 | 2017-11-21 | 中国航空工业集团公司西安飞行自动控制研究所 | A kind of high acceleration vibrational spectra shape design method |
| CN107764493A (en) * | 2017-10-11 | 2018-03-06 | 无锡威孚力达催化净化器有限责任公司 | A kind of acquisition methods and acquisition device for vibrating long duration test PSD |
| CN108036908A (en) * | 2017-10-20 | 2018-05-15 | 开沃新能源汽车集团有限公司 | A kind of batteries of electric automobile bag random vibration fatigue accelerated method based on true road spectrum |
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| CN109073497A (en) * | 2016-04-29 | 2018-12-21 | 西门子工业软件公司 | The method and system of the damage measure that accelerates fatigue for object |
| CN110836777A (en) * | 2018-08-16 | 2020-02-25 | 郑州宇通客车股份有限公司 | Motor accelerated life test method and system |
| CN111198102A (en) * | 2020-01-17 | 2020-05-26 | 重庆长安新能源汽车科技有限公司 | Integrated electric drive system rack vibration working condition fitting method |
| CN111222199A (en) * | 2019-11-13 | 2020-06-02 | 中国汽车工程研究院股份有限公司 | Key index selection and equivalent calculation method during association of user and test field |
| CN112378606A (en) * | 2020-10-10 | 2021-02-19 | 盐城工学院 | Method for separating random vibration and impact signals |
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| CN113586275A (en) * | 2021-07-23 | 2021-11-02 | 东风汽车集团股份有限公司 | Temperature control system and control method for three-way catalyst converter rack circulation endurance test |
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| CN104236830A (en) * | 2014-09-12 | 2014-12-24 | 玉柴联合动力股份有限公司 | Heavy truck muffler structure service life testing device and method |
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Application publication date: 20121128 |