CN104156599A - Accelerated life test load spectrum determining method with multiple mechanisms taken into consideration - Google Patents
Accelerated life test load spectrum determining method with multiple mechanisms taken into consideration Download PDFInfo
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- CN104156599A CN104156599A CN201410396392.8A CN201410396392A CN104156599A CN 104156599 A CN104156599 A CN 104156599A CN 201410396392 A CN201410396392 A CN 201410396392A CN 104156599 A CN104156599 A CN 104156599A
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Abstract
The invention discloses an accelerated life test load spectrum determining method with multiple mechanisms taken into consideration. The accelerated life test load spectrum determining method specifically comprises the following steps of analyzing the main mechanism, calculating an acceleration factor, initially determining the accelerated stress level and the acceleration factor, initially determining the test time based on the mechanisms such as the fatigue mechanism and the abrasion mechanism, finally determining the test time with aging and corroding mechanisms taken into consideration, and finally determining an accelerated life test load spectrum. The accelerated life test load spectrum determining method can be directly applied to products and can be used for determining parameters of the accelerated life test load spectrum based on mechanism calculation, and the engineering applicability is high. According to the accelerated life test load spectrum determining method, multi-mechanism test time collaborative analysis is carried out according to the fatigue and abrasion mechanisms and aging and colliding mechanisms, and the accuracy of the accelerated life test time is guaranteed.
Description
Technical field
The invention provides a kind of accelerated life test loading spectrum of considering that multimachine is managed and determine method, particularly relate to each method for determining test parameter of gas producing formation accelerated life test under a kind of many mechanisms, belong to accelerated life test technical field.
Background technology
Life-span, as the tolerance of permanance, is the important tactical and technical norms of weaponry, is to affect the key factor that equipment Efficacy is given full play to.How to design accelerated life test loading spectrum and be current Long Life Products durability analysis and tested the common problem facing by verification experimental verification life of product index, be also the gordian technique in product long-life design and analysis, test, assessment and prediction simultaneously.For mechanical Long Life Products, because its price is high, can not reduce test period by increasing sample size; And course of work imposed stress is complicated, its inefficacy is the coefficient results of a plurality of failure mechanisms, make speedup factor be difficult to determine, therefore the THE ACCELERATED LIFE TEST STUDY for Long Life Products also mainly concentrates in the single failure mechanism of unit at present, and system-level accelerated life test and loading spectrum are determined to the research of method is also relatively less.
Summary of the invention
1, goal of the invention
The object of the invention is to for the existing problem of prior art, provide a kind of accelerated life test loading spectrum of considering that multimachine is managed to determine method, it is that a kind of Long Life Products accelerated life test loading spectrum based on failure mechanism is determined method, based on product main frame reason analysis result, for difference consume type failure mechanism, carry out life-span and speedup factor calculating final definite accelerated life test loading spectrum, for realizing a new generation's equipment long-life technology, require to provide effective method support, the acceleration service life test method research of complication system is had to reference.
2, technical scheme
A kind of accelerated life test loading spectrum of considering that multimachine is managed of the present invention is determined method, and the method concrete steps are as follows:
Step 1: main Analysis on Mechanism.Determine weak link and the corresponding consume type failure mechanism thereof of product.Main Analysis on Mechanism is according to given loading spectrum or mission profile, composition, structure, principle in conjunction with actuator product, carry out fault mode, mechanism and impact analysis (FMMEA, Failure Mode, Mechanisms and Effects Analysis), on the basis of FMMEA, according to severity and the Frequency of fault mode corresponding to each mechanism, comprehensively determine the weak link of product and corresponding main frame reason thereof.
Step 2: speedup factor is calculated.According to main frame reason analysis result in step 1, bring into and in speedup factor model, calculate respectively the speedup factor of each main frame reason under different stress levels.
Step 3: accelerate stress level and speedup factor tentatively definite.For each main frame reason speedup factor result of calculation under different stress levels, according to speedup factor root mean square minimum principle, tentatively determine and accelerate stress level S
j; In conjunction with preliminary definite acceleration stress level, according to speedup factor, get little principle again and determine speedup factor A
f.
Step 4: tentatively definite based on test period tired, wearing and tearing action class mechanism.According to tired, the conventional stress loading of wearing and tearing action class mechanism combination product, compose the preliminary test period of determining.Mainly comprise:
A. according to speedup factor A
fdetermine heavily stressed loading spectrum.Guaranteeing to reduce low stress level period under the condition that global cycle number of times and stress level number are constant, simultaneously corresponding increase S
junder cycle index, the accumulated damage that makes heavily stressed spectrum is the A of conventional stress loading spectrum
fdoubly, now the load type of correspondence and stress level are the preliminary heavily stressed loading spectrum of determining.
B. accelerated life test cycling element number is determined.According to conventional stress, compose corresponding cycling element and count N
cwith speedup factor A
f, determine that cycling element corresponding to accelerated life test count N
jif (N
jnon-integer rounds up) be:
In formula: S
jpreliminary definite acceleration stress level; A
fthe speedup factor of accelerated life test product; N
cconventional stress loading is composed corresponding cycling element number;
C. cycling element loading spectrum is tentatively definite.Cycle index n under every grade of stress level of a cycling element loading spectrum of accelerated life test
i0for:
N in formula
i0for cycle index (if the n under every grade of stress level of cycling element loading spectrum
i0non-integer rounds up); n
ifor the cycle index under every grade of stress level of heavily stressed loading spectrum; N
jthe cycling element number that accelerated life test loading spectrum is corresponding.
In conjunction with every kind of stress level lower frequency of conventional stress spectrum, be f
i0, a cycling element test period t
0for:
In formula: r is conventional stress spectrum stress level number; n
i0cycle index under every grade of stress level of cycling element loading spectrum; f
i0every kind of stress level lower frequency of conventional stress spectrum; t
0a cycling element test period.
D. the preliminary of life test time determined.Consider product dispersion coefficient primary Calculation life test time, get dispersion coefficient K=1.2～1.5, life test time t that can be tentatively definite
j0for:
t
J0＝K×N
J×t
0 (4)
Accelerated life test cycling element after consideration product dispersion coefficient is counted N
j' be:
N
J'＝K×N
J (5)
In formula: t
j0preliminary definite life test time; N
j' consider the accelerated life test cycling element number after dispersion coefficient;
Step 5: the final of test period of considering aging and corrosion class mechanism determined.Formula for life test time (6) aging and corrosion class mechanism is calculated:
T in formula
j1for the test period based on the definite accelerated life test of aging and corrosion mechanism, t
rfor index of aging required value, A
frfor aging and speedup factor corrosion mechanism.
Calculate respectively the t under different stress levels
j1, then choose and be wherein less than and approach most t
j0the corresponding stress level of test period as aging and acceleration stress level corrosion mechanism.
Step 6: the final of accelerated life test loading spectrum determined.The life test time that the accelerated life test cycling element loading spectrum parameter that comprehensive step 4 is definite and cycling element number and step 5 are definite, gets the maximal value of two test periods as product accelerated life test loading spectrum.
Wherein, " the main frame reason " described in step 1 refers to the consume type failure mechanism that life of product is played a crucial role.
Wherein, " comprehensively determining the weak link of product and corresponding main frame reason thereof " described in step 1 is to using mechanism corresponding to severity fault mode large and that Frequency is high as the main frame reason of product, the weak link that the minimum indenture level unit of main frame reason correspondence is product.
Wherein, " according to speedup factor root mean square minimum principle, tentatively determine and accelerate stress level " described in step 3 refers to and calculates respectively every kind of speedup factor root mean square that accelerates all weak links under stress level, and the minimum corresponding acceleration stress level of the speedup factor root mean square of usining is as the acceleration stress level of product accelerated life test.
Wherein, " get little principle according to speedup factor and determine speedup factor " described in step 3 refers to the speedup factor of utilizing speedup factor model to calculate each weak link under definite acceleration stress level, usings the speedup factor of minimum speedup factor as product.
3, advantage and effect
The present invention has the following advantages:
1) a kind of accelerated life test loading spectrum of considering that multimachine is managed of the present invention is determined method, has provided the method based on each parameter of mechanism calculative determination accelerated life test loading spectrum, and engineering adaptability is strong.
2) the present invention is a kind of considers that the accelerated life test loading spectrum of multimachine reason determines method, and minute tired, wearing and tearing action class mechanism and test period Cooperative Analysis aging, that corrosion class mechanism has been carried out multimachine reason have guaranteed the accuracy of life test time.
Accompanying drawing explanation
Fig. 1 is that the present invention determines method flow diagram.
In figure, symbol description is as follows:
| t/h | Abscissa axis represents the time, unit: hour |
| t/min | Abscissa axis represents the time, unit: minute |
| PSD | Axis of ordinates represents power spectrum density |
| Hz | The unit of frequency: hertz |
Embodiment
Below in conjunction with drawings and Examples with certain actuator accelerated life test loading spectrum, determine that the present invention is described in further detail.
A kind of accelerated life test loading spectrum of considering that multimachine is managed of the present invention is determined method, and as shown in Figure 1, the method concrete steps are as follows:
Step 1: main Analysis on Mechanism.Determine weak link and the corresponding consume type failure mechanism thereof of product.Main Analysis on Mechanism is according to given loading spectrum or mission profile, composition, structure, principle in conjunction with actuator product, carry out fault mode, mechanism and impact analysis (FMMEA, Failure Mode, Mechanisms and Effects Analysis), on the basis of FMMEA, according to severity and the Frequency of fault mode corresponding to each mechanism, comprehensively determine the weak link of product and corresponding main frame reason thereof.Certain actuator product main frame reason analysis result is as shown in table 1:
Certain actuator product main frame reason analysis result of table 1
Step 2: speedup factor is calculated.According to main frame reason analysis result in step 1, calculate respectively the speedup factor of each main frame reason under different stress levels.Under the different stress levels of certain actuator product, speedup factor result of calculation is as shown in table 2:
Speedup factor result of calculation under the different stress levels of certain actuator product of table 2
Step 3: accelerate stress level and speedup factor tentatively definite.For each main frame reason speedup factor result of calculation under different stress levels, according to speedup factor root mean square minimum principle, tentatively determine and accelerate stress level S
j; In conjunction with preliminary definite acceleration stress level, according to speedup factor, get little principle again and determine speedup factor A
f.Certain actuator product accelerates stress level and speedup factor tentatively determines that result is as shown in table 3:
Certain actuator product of table 3 accelerates stress level and speedup factor result of calculation
Step 4: tentatively definite based on test period tired, wearing and tearing action class mechanism.According to tired, the conventional stress loading of wearing and tearing action class mechanism combination product, compose the preliminary test period of determining.Mainly comprise:
A. according to speedup factor A
fdetermine heavily stressed loading spectrum.Guaranteeing to reduce low stress level period under the condition that global cycle number of times and stress level number are constant, simultaneously corresponding increase S
junder cycle index, the accumulated damage that makes heavily stressed spectrum is the A of conventional stress loading spectrum
fdoubly.Wherein the conventional stress spectrum of certain actuator product is as shown in table 4, and heavily stressed loading spectrum is as shown in table 5:
The conventional stress spectrum of certain actuator product of table 4
| Operating mode | Load | Stroke | Frequency (Hz) | Cycle index |
| 1 | 0％ | 100％ | 0.3 | 1800 |
| 2 | 50％ | 100％ | 0.15 | 3600 |
| 3 | 90％ | 75％ | 0.15 | 9000 |
| 4 | 50％ | 50％ | 0.21 | 45000 |
| 5 | 10％ | 10％ | 0.3 | 108000 |
| 6 | 5％ | 2％ | 0.36 | 720000 |
The heavily stressed loading spectrum of certain actuator product of table 5
| Operating mode | Load | Stroke | Frequency (Hz) | Cycle index |
| 1 | 0％ | 100％ | 0.3 | 1800 |
| 2 | 50％ | 100％ | 0.15 | 3600 |
| 3 | 90％ | 75％ | 0.15 | 67000 |
| 4 | 50％ | 50％ | 0.21 | 640000 |
| 5 | 10％ | 10％ | 0.3 | 50000 |
| 6 | 5％ | 2％ | 0.36 | 125000 |
Wherein heavily stressed spectrum shown in table 5 is 3.42 times that conventional stress loading is composed to the accumulated damage of the cylindrical shell mechanism of fatigue.
B. accelerated life test cycling element number is determined.According to conventional stress, compose corresponding cycling element and count N
cwith speedup factor A
f, determine that cycling element corresponding to accelerated life test count N
jif (N
jnon-integer rounds up) be:
Corresponding 108 cycling elements of the conventional stress spectrum of certain actuator product, accelerated life test loading spectrum is corresponding
individual cycling element.
C. cycling element loading spectrum is tentatively definite.Cycle index n under every grade of stress level of a cycling element loading spectrum of accelerated life test
i0for:
N wherein
i0for cycle index (if the n under every grade of stress level of cycling element loading spectrum
i0non-integer rounds up), n
ifor the cycle index under every grade of stress level of heavily stressed loading spectrum.In conjunction with every kind of stress level lower frequency of conventional stress spectrum, be f
i0, a cycling element test period t
0for:
Wherein r is conventional stress spectrum stress level number.Certain actuator product accelerated life test cycling element loading spectrum is tentatively determined as shown in table 6:
Table 6 accelerated life test cycling element loading spectrum is tentatively definite
D. life test time is tentatively definite.Consider product dispersion coefficient primary Calculation life test time, get dispersion coefficient K=1.2～1.5, life test time t that can be tentatively definite
j0for:
t
J0＝K×N
J×t
0 (4)
Accelerated life test cycling element after consideration product dispersion coefficient is counted N
j' be:
N
J'＝K×N
J (5)
Certain actuator product dispersion coefficient gets 1.5, and accelerated life test T.T. is 328.08 * 1.5=492.12h, and testing actual cycling element number is 32 * 1.5=48.
Step 5: consider that test period aging and corrosion class mechanism is finally definite.Formula for life test time (6) aging and corrosion class mechanism is calculated:
T in formula
j1for the test period based on the definite accelerated life test of aging and corrosion mechanism, t
rfor index of aging required value, A
frfor aging and speedup factor corrosion mechanism.Calculate respectively the t under different stress levels
j1, then choose and be wherein less than and approach most t
j0the corresponding stress level of test period as aging and acceleration stress level corrosion mechanism.Certain actuator life of product index request value t
rat=5000 pilot time, because it exists agine mechaism, calculate respectively agine mechaism speedup factor A under different oil temperatures
frwith life test time t
j1as shown in table 7:
Agine mechaism speedup factor and life test time result of calculation under the different oil temperatures of table 7
| Oil temperature (℃) | Speedup factor | Test period (hour, dispersion coefficient gets 1.5) |
| 105 | 16.87 | 444.13 |
| 104 | 15.84 | 473.59 |
| 103 | 14.85 | 505.18 |
In table 7, test Time Calculation result be less than aforementioned primary Calculation test period 492.12h and with it immediate oil temperature be 104 ℃, therefore choose the high stress level of oil temperature, be 104 ℃.
Step 6: accelerated life test loading spectrum is finally determined.The definite life test time of the accelerated life test cycling element loading spectrum parameter that comprehensive step 4 is definite and cycling element number and step 5 is finally determined accelerated life test loading spectrum.Certain actuator product accelerated life test cycling element loading spectrum is as shown in table 8, and 48 cycling elements are carried out in accelerated life test altogether, and total time on test is 492.12h.
Certain actuator product accelerated life test cycling element loading spectrum of table 8
Claims (5)
1. consider that the accelerated life test loading spectrum of multimachine reason determines a method, it is characterized in that: the method concrete steps are as follows:
Step 1: main Analysis on Mechanism; Determine weak link and the corresponding consume type failure mechanism thereof of product, main Analysis on Mechanism is according to given loading spectrum or mission profile, composition, structure, principle in conjunction with actuator product, carrying out fault mode, mechanism and impact analysis is FMMEA, on the basis of FMMEA, according to severity and the Frequency of fault mode corresponding to each mechanism, comprehensively determine the weak link of product and corresponding main frame reason thereof;
Step 2: speedup factor is calculated; According to main frame reason analysis result in step 1, bring into and in speedup factor model, calculate respectively the speedup factor of each main frame reason under different stress levels;
Step 3: accelerate stress level and speedup factor tentatively definite; For each main frame reason speedup factor result of calculation under different stress levels, according to speedup factor root mean square minimum principle, tentatively determine and accelerate stress level S
j; In conjunction with preliminary definite acceleration stress level, according to speedup factor, get little principle again and determine speedup factor A
f;
Step 4: tentatively definite based on test period tired, wearing and tearing action class mechanism; According to tired, the conventional stress loading of wearing and tearing action class mechanism combination product, compose the preliminary test period of determining, mainly comprise:
A. according to speedup factor A
fdetermine heavily stressed loading spectrum; Guaranteeing to reduce low stress level period under the condition that global cycle number of times and stress level number are constant, simultaneously corresponding increase S
junder cycle index, the accumulated damage that makes heavily stressed spectrum is the A of conventional stress loading spectrum
fdoubly, now the load type of correspondence and stress level are the preliminary heavily stressed loading spectrum of determining;
B. accelerated life test cycling element number is determined; According to conventional stress, compose corresponding cycling element and count N
cwith speedup factor A
f, determine that cycling element corresponding to accelerated life test count N
jfor:
In formula: S
jpreliminary definite acceleration stress level; A
fthe speedup factor of accelerated life test product; N
cconventional stress loading is composed corresponding cycling element number; If N
jnon-integer rounds up;
C. cycling element loading spectrum is tentatively definite; Cycle index n under every grade of stress level of a cycling element loading spectrum of accelerated life test
i0for:
N in formula
i0for the cycle index under every grade of stress level of cycling element loading spectrum, if n
i0non-integer rounds up; n
ifor the cycle index under every grade of stress level of heavily stressed loading spectrum; N
jthe cycling element number that accelerated life test loading spectrum is corresponding;
In conjunction with every kind of stress level lower frequency of conventional stress spectrum, be f
i0, a cycling element test period t
0for:
In formula: r is conventional stress spectrum stress level number; n
i0cycle index under every grade of stress level of cycling element loading spectrum; f
i0every kind of stress level lower frequency of conventional stress spectrum; t
0a cycling element test period;
D. the preliminary of life test time determined; Consider product dispersion coefficient primary Calculation life test time, get dispersion coefficient K=1.2～1.5, preliminary definite life test time t
j0for:
t
J0＝K×N
J×t
0 (4)
Accelerated life test cycling element after consideration product dispersion coefficient is counted N
j' be:
N
J′＝K×N
J (5)
In formula: t
j0preliminary definite life test time; N
j' consider the accelerated life test cycling element number after dispersion coefficient;
Step 5: the final of test period of considering aging and corrosion class mechanism determined; Formula for life test time (6) aging and corrosion class mechanism is calculated:
T in formula
j1for the test period based on the definite accelerated life test of aging and corrosion mechanism, t
rfor index of aging required value, A
frfor aging and speedup factor corrosion mechanism;
Calculate respectively the t under different stress levels
j1, then choose and be wherein less than and approach most t
j0the corresponding stress level of test period as aging and acceleration stress level corrosion mechanism;
Step 6: the final of accelerated life test loading spectrum determined; The life test time that the accelerated life test cycling element loading spectrum parameter that comprehensive step 4 is definite and cycling element number and step 5 are definite, gets the maximal value of two test periods as product accelerated life test loading spectrum.
2. a kind of accelerated life test loading spectrum of considering that multimachine is managed according to claim 1 is determined method, it is characterized in that: " main frame reason " described in step 1 refers to the consume type failure mechanism that life of product is played a crucial role.
3. a kind of accelerated life test loading spectrum of considering that multimachine is managed according to claim 1 is determined method, it is characterized in that: " comprehensively the determining the weak link of product and corresponding main frame reason thereof " described in step 1 is to using mechanism corresponding to severity fault mode large and that Frequency is high as the main frame reason of product, the weak link that the minimum indenture level unit of main frame reason correspondence is product.
4. a kind of accelerated life test loading spectrum of considering that multimachine is managed according to claim 1 is determined method, it is characterized in that: " according to speedup factor root mean square minimum principle, tentatively determine and accelerate stress level " described in step 3 refers to and calculate respectively every kind of speedup factor root mean square that accelerates all weak links under stress level, and the minimum corresponding acceleration stress level of the speedup factor root mean square of usining is as the acceleration stress level of product accelerated life test.
5. a kind of accelerated life test loading spectrum of considering that multimachine is managed according to claim 1 is determined method, it is characterized in that: " get little principle according to speedup factor and determine speedup factor " described in step 3 refers to the speedup factor of utilizing speedup factor model to calculate each weak link under definite acceleration stress level, using the speedup factor of minimum speedup factor as product.
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| CN109987251A (en) * | 2019-04-08 | 2019-07-09 | 中国航空综合技术研究所 | The equivalent lifetime test method and equipment for weak link based on stress equivalent method |
| CN110686915A (en) * | 2019-10-24 | 2020-01-14 | 上海航天精密机械研究所 | Method, system, medium and equipment for determining multi-stress acceleration test profile |
| CN111079250A (en) * | 2019-11-08 | 2020-04-28 | 航天科工防御技术研究试验中心 | Electronic product fatigue life assessment and assessment model establishment method and device |
| CN111079250B (en) * | 2019-11-08 | 2021-06-08 | 航天科工防御技术研究试验中心 | Electronic product fatigue life assessment and assessment model establishment method and device |
| CN110907725A (en) * | 2019-11-20 | 2020-03-24 | 北京航空航天大学 | Electronic product accelerated life test method based on fault behaviors |
| CN110907725B (en) * | 2019-11-20 | 2020-10-09 | 北京航空航天大学 | Electronic product accelerated life test method based on fault behaviors |
| CN111947950A (en) * | 2020-07-01 | 2020-11-17 | 北京工业大学 | Multi-dimensional comprehensive stress life test load spectrum design method based on load information matrix |
| CN111947950B (en) * | 2020-07-01 | 2022-03-08 | 北京工业大学 | Multi-dimensional comprehensive stress life test load spectrum design method based on load information matrix |
| CN113297736A (en) * | 2021-05-24 | 2021-08-24 | 北京航空航天大学 | Multi-component accelerated life verification test optimization method for different life index requirements |
| CN115577538A (en) * | 2022-10-14 | 2023-01-06 | 中国航发沈阳发动机研究所 | Mechanical product accelerated life test design method based on product failure mechanism |
| CN115577538B (en) * | 2022-10-14 | 2023-09-22 | 中国航发沈阳发动机研究所 | Mechanical product accelerated life test design method based on product failure mechanism |
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