CN103674521A - Compensator verification method based on working condition separating design - Google Patents
Compensator verification method based on working condition separating design Download PDFInfo
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- CN103674521A CN103674521A CN201310611724.5A CN201310611724A CN103674521A CN 103674521 A CN103674521 A CN 103674521A CN 201310611724 A CN201310611724 A CN 201310611724A CN 103674521 A CN103674521 A CN 103674521A
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Abstract
The invention discloses a compensator verification method based on working condition separating design. The method includes: determining the absolute compensation amount under each working condition of a compensator, wherein the maximum absolute compensation amount of the i working condition is the maximum absolute compensation amount of the i-1 working condition plus the maximum design compensation amount of the i working condition, and the minimum absolute compensation amount of the i working condition is minimum absolute compensation amount of the i-1 working condition plus the minimum design compensation amount of the i working condition; calculating the buckling pressure, intensity check value and fatigue service life calculation value of the compensator according to the absolute compensation amount, working pressure and the structural parameters and mechanical indexes of the compensator; calculating damage factors according to the required fatigue service life design value of each working condition and the fatigue service life calculation value under each working condition; judging whether the compensator satisfies the requirements or not according to damage factor, and if so, performing fatigue tests. The method is simple to implement, high in adaptability, and high in accuracy.
Description
Technical field
The present invention relates to a kind of compensator verification method based on divided working status design.
Background technology
As shown in Figure 1, compensator is generally comprised of corrugated tube 1 and joint 2.Compensator checking is mainly whether the structural parameters of checking corrugated tube meet various working condition requirements.
The in-service model of comparing, larger at the novel vehicle tank grinding, pressurizing transmission system pipe system is also longer and more complicated, therefore to bearing the design of Compensator of piping work compensation and temperature compensation function, has higher requirement.Correspondingly, adopt the superpose determined design objective of method of each operating mode of original envelope, many times all can not design the compensator that meets actual production technological requirement.The projects such as that compensator test mainly comprises is withstand voltage, flexing, fatigue.The compensator demonstration test of in the past carrying out is all to carry out under single working condition.Single operating mode checking refers in the same class test of same product, and working pressure is constant, and warm area is constant, and compensation rate is constant.Divided working status design, owing to carrying out design according to compensator residing different operating condition in the work period, equally also requires test method to depart from single operating mode checking in the past, but carries out the checking of multi-state.Therefore, need to develop a kind of practicable multi-state verification method, so that the compensator designing according to divided working status is carried out to proving test.
Summary of the invention
Technical matters to be solved by this invention is: the compensator verification method based on divided working status design that a kind of simple, applicable practical application is provided.
The present invention includes following technical scheme:
A kind of compensator verification method based on divided working status design, described compensator successively experiences K operating mode, each operating mode has design compensation amount corresponding to this operating mode, Fatigue life design required value, working pressure and working temperature, described design compensation amount comprises minimal design compensation rate and design maximum compensation rate, comprises the steps:
(1) determine the absolute compensation rate under each operating mode of compensator
Described absolute compensation rate comprises maximum definitely compensation rate and minimum definitely compensation rate; the absolute compensation rate of first operating mode is the design compensation amount of this operating mode; the absolute compensation rate of maximum that the absolute compensation rate of maximum of i operating mode is i-1 operating mode adds the design maximum compensation rate of i operating mode; the absolute compensation rate of minimum that the absolute compensation rate of minimum of i operating mode is i-1 operating mode adds the minimal design compensation rate of i operating mode, i=2 to K;
(2), under each operating mode, according to the mechanics of materials material of the structural parameters of absolute compensation rate, working pressure, compensator and compensator, calculate buckling pressure, strength check value and the Calculation of Fatigue Life value of compensator;
(3) under each operating mode, judge whether the buckling pressure of compensator, intensity meet the demands,
When all operating modes all meet the demands, the Calculation of Fatigue Life value of record compensator under each operating mode, and proceed to step (4);
Otherwise the structural parameters of adjustment compensator, then proceed to step (2);
(4) whether meet the demands the fatigue lifetime that judges compensator,
If the Fatigue life design required value of each operating mode is respectively N
1, N
2, N
3n
k, the Calculation of Fatigue Life value under each operating mode is respectively n
1, n
2, n
3n
k, damage factor
When D<1, design of Compensator meets the demands, and proceeds to step (5);
Otherwise the structural parameters of adjustment compensator, then proceed to step (2).
(5) under each operating mode, compensator is carried out to torture test, judge whether compensator meets fatigue behaviour requirement;
Under each operating mode, compensator is carried out to the process of torture test as follows: compensator one end is fixed, the other end be take drift and is stretched or compress as starting point, compensator is applied to the working temperature under this operating mode, in compensator inside, apply working pressure corresponding to this operating mode, according to the absolute compensation rate of the maximum under this operating mode and minimum definitely compensation rate, compensator is stretched or compress; Stretch or the number of times of compression is 4 times of Fatigue life design required value under this operating mode; When compensator does not occur revealing, think that compensator meets fatigue behaviour requirement.
The present invention compared with prior art tool has the following advantages:
The inventive method is implemented comparatively easy, and test coverage is strong, is a kind of carrier rocket compensator verification method of applicable practical application.The verification method of carrying out the compensator of compensator Fatigue Test Design according to divided working status is a difficult problem always.Because the external factor such as the temperature under different operating modes, pressure, compensation rate are all different, if compensator is carried out torture test according to circulating successively operating mode order and corresponding fatigue lifetime, the environment that needs repeatedly to circulate loads, and not only increases experimentation cost but also has a strong impact on test progress.Therefore relatively easy method is that every kind of operating mode is only carried out to a secondary environment loading, yet the method can not arrange too highly by the test number (TN) of single test operating mode again, avoids product to cross examination and loses efficacy.Fatigue test method involved in the present invention takes into full account the compensator feature of test itself and divided working status design, guarantee to verify on the basis of design objective comprehensively, rationally merges or refinement test condition the accurate reflection of warranty test data to design effort.
Accompanying drawing explanation
Fig. 1 is compensator structure schematic diagram;
Fig. 2 is the compensator verification method process flow diagram based on divided working status design of the present invention.
Embodiment
Below just by reference to the accompanying drawings the present invention is described further.
Compensator successively experiences K operating mode, each operating mode has design compensation amount corresponding to this operating mode, Fatigue life design required value, working pressure and working temperature, described design compensation amount comprises minimal design compensation rate and design maximum compensation rate, as shown in Figure 2, a kind of compensator verification method based on divided working status design of the present invention, comprises the steps:
(1) determine the absolute compensation rate under each operating mode of compensator
Described absolute compensation rate comprises maximum definitely compensation rate and minimum definitely compensation rate, the absolute compensation rate of first operating mode is the design compensation amount of this operating mode, the absolute compensation rate of maximum that the absolute compensation rate of maximum of i operating mode is i-1 operating mode adds the design maximum compensation rate of i operating mode, the absolute compensation rate of minimum that the absolute compensation rate of minimum of i operating mode is i-1 operating mode adds the minimal design compensation rate of i operating mode, i=2 to K.Design compensation amount and definitely compensation rate comprise axially, radially with angle compensation amount.
(2), under each operating mode, according to the mechanical index of the structural parameters of absolute compensation rate, working pressure, compensator and compensator material, calculate buckling pressure, strength check value and the Calculation of Fatigue Life value of compensator; Circular is prior art, can be referring to GB/T12777-2008 metal corrugated pipe expansion joint general technical specifications.The buckling pressure of compensator comprises post buckling pressure and face buckling pressure.Described strength check value comprises the circumferential membrane stress σ of corrugated tube straight section that pressure causes
1, the circumferential membrane stress σ of corrugated tube that pressure causes
2, the corrugated tube meridian that pressure causes is to membrane stress σ
3the corrugated tube meridian causing with pressure is to bending stress σ
4.
(3), under each operating mode, judge whether the buckling pressure of compensator, intensity meet the demands.
When post buckling pressure >=working pressure, during face buckling pressure >=working pressure, the buckling pressure of compensator meets the demands.
Work as σ
1≤ σ
b, σ
2≤ σ
b, σ
3+ σ
4≤ 1.5 * σ
btime, the intensity of compensator meets the demands.
When all operating modes all meet the demands, the Calculation of Fatigue Life value of record compensator under each operating mode, and proceed to step (4);
Otherwise the structural parameters of adjustment compensator, then proceed to step (2);
(4) whether meet the demands the fatigue lifetime that judges compensator,
If the Fatigue life design required value of each operating mode is respectively N
1, N
2, N
3n
k, the Calculation of Fatigue Life value under each operating mode is respectively n
1, n
2, n
3n
k, damage factor
When D<1, design of Compensator meets the demands, and finishes;
Otherwise the structural parameters of adjustment compensator, then proceed to step (2).
The structural parameters of compensator comprise external diameter, straight flange external diameter, the pitch of waves, wave height, the number of plies and bed thickness, and mechanical parameters comprises elastic modulus, yield strength and tensile strength.
(5) under each operating mode, compensator is carried out to torture test, judge whether compensator meets fatigue behaviour requirement;
Under each operating mode, compensator is carried out to the process of torture test as follows: compensator one end is fixed, the other end be take drift and is stretched or compress as starting point, compensator is applied to the working temperature under this operating mode, in compensator inside, apply working pressure corresponding to this operating mode, according to the absolute compensation rate of the maximum under this operating mode and minimum definitely compensation rate, compensator is stretched or compress; Stretch or the number of times (number of times of torture test under this operating mode) of compression is 4 times of Fatigue life design required value under this operating mode; When compensator does not occur revealing, think that compensator meets fatigue behaviour requirement.
The object of testing fatigue work is to test compensator and under the applying working condition of regulation, completes the ability of regulation compensate function, and it need to apply temperature, pressure and displacement to compensator.Because three changing factors of different operating modes differ larger, therefore adopt divided working status to test and increase the method for safety coefficient.The torture test number of times that each operating mode need be carried out is 4 times of its designed life, i.e. 4N
1, 4N
2, 4N
k.Compensator sequentially experiences after K environment examined to be thought and meets fatigue behaviour requirement.
Embodiment
The compensator of take below successively experiences assembling, test, annotate, penetrate before, five operating modes of flight are example, verification method of the present invention is introduced, in this embodiment, the initial structural parameters of compensator are: external diameter φ 100mm, straight flange external diameter φ 80mm, pitch of waves 10mm, 10 of wave numbers, 2 layers of the numbers of plies, bed thickness 0.3mm; Corrugated tube material 1Cr18Ni9Ti, the mechanical index of this material is as shown in table 1.In the present embodiment, known quantity and the calculated value of each operating mode are as shown in table 2, by adopting verification method of the present invention, verify that this design of Compensator meets the demands.
The mechanical index of table 11Cr18Ni9Ti
| ? | Yield strength (MPa) | Tensile strength (MPa) | Elastic modulus (GPa) |
| 80K | 380 | 1625 | 214 |
| Normal temperature | 205 | 520 | 198 |
| 500K | 135 | 460 | 173 |
The known quantity that each operating mode of table 2 is corresponding and result of calculation
The unspecified part of the present invention belongs to general knowledge as well known to those skilled in the art.
Claims (1)
1. the compensator verification method based on divided working status design, described compensator successively experiences K operating mode, each operating mode has design compensation amount corresponding to this operating mode, Fatigue life design required value, working pressure and working temperature, described design compensation amount comprises minimal design compensation rate and design maximum compensation rate, it is characterized in that, comprise the steps:
(1) determine the absolute compensation rate under each operating mode of compensator
Described absolute compensation rate comprises maximum definitely compensation rate and minimum definitely compensation rate; the absolute compensation rate of first operating mode is the design compensation amount of this operating mode; the absolute compensation rate of maximum that the absolute compensation rate of maximum of i operating mode is i-1 operating mode adds the design maximum compensation rate of i operating mode; the absolute compensation rate of minimum that the absolute compensation rate of minimum of i operating mode is i-1 operating mode adds the minimal design compensation rate of i operating mode, i=2 to K;
(2), under each operating mode, according to the mechanics of materials material of the structural parameters of absolute compensation rate, working pressure, compensator and compensator, calculate buckling pressure, strength check value and the Calculation of Fatigue Life value of compensator;
(3) under each operating mode, judge whether the buckling pressure of compensator, intensity meet the demands,
When all operating modes all meet the demands, the Calculation of Fatigue Life value of record compensator under each operating mode, and proceed to step (4);
Otherwise the structural parameters of adjustment compensator, then proceed to step (2);
(4) whether meet the demands the fatigue lifetime that judges compensator,
If the Fatigue life design required value of each operating mode is respectively N
1, N
2, N
3n
k, the Calculation of Fatigue Life value under each operating mode is respectively n
1, n
2, n
3n
k, damage factor
When D<1, design of Compensator meets the demands, and proceeds to step (5);
Otherwise the structural parameters of adjustment compensator, then proceed to step (2);
(5) under each operating mode, compensator is carried out to torture test, judge whether compensator meets fatigue behaviour requirement;
Under each operating mode, compensator is carried out to the process of torture test as follows: compensator one end is fixed, the other end be take drift and is stretched or compress as starting point, compensator is applied to the working temperature under this operating mode, in compensator inside, apply working pressure corresponding to this operating mode, according to the absolute compensation rate of the maximum under this operating mode and minimum definitely compensation rate, compensator is stretched or compress; Stretch or the number of times of compression is 4 times of Fatigue life design required value under this operating mode; When compensator does not occur revealing, think that compensator meets fatigue behaviour requirement.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107330208A (en) * | 2017-07-06 | 2017-11-07 | 沈阳透平机械股份有限公司 | A kind of supercharger stator elements analysis method |
| CN110146261A (en) * | 2019-04-10 | 2019-08-20 | 中国电力科学研究院有限公司 | A kind of high-voltage combined electrical apparatus telescopic joint cycle life test method and system |
| CN111929427A (en) * | 2020-07-01 | 2020-11-13 | 中国核电工程有限公司 | Rubber expansion joint performance test verification method |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110146261A (en) * | 2019-04-10 | 2019-08-20 | 中国电力科学研究院有限公司 | A kind of high-voltage combined electrical apparatus telescopic joint cycle life test method and system |
| CN110146261B (en) * | 2019-04-10 | 2022-12-09 | 中国电力科学研究院有限公司 | Method and system for testing cycle life of expansion joint for high-voltage combined electrical appliance |
| CN111929427A (en) * | 2020-07-01 | 2020-11-13 | 中国核电工程有限公司 | Rubber expansion joint performance test verification method |
| CN111929427B (en) * | 2020-07-01 | 2023-04-07 | 中国核电工程有限公司 | Rubber expansion joint performance test verification method |
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