CN105675275A - Equivalent accelerated life testing method of fuel pump regulator - Google Patents

Abstract

The invention discloses an equivalent accelerated life testing method of a fuel pump regulator. Through equivalent accelerated life testing of the to-be-tested fuel pump regulator, an equivalent accelerated life test time of the fuel pump regulator is obtained. According to a preset equivalent accelerated life time mapping table, the working time of the fuel pump regulator is calculated. The mapping table includes mapping relations between the equivalent accelerated life test time and the working time. According to the calculated working time, a service life time of the fuel pump regulator is determined. Compared with other conventional life tests, the method shortens the test time, so that the test cost is reduced. Besides, the method improves the development progress of the fuel pump regulator.

Description

The acceleration equivalent lifetime test method of fuel-oil pump governor

Technical field

The present invention relates to the life test field of product, especially, relate to the acceleration equivalent lifetime test method of a kind of fuel-oil pump governor.

Background technology

The use of aero-engine fuel-oil pump governor has life requirements, in order to verify whether its life-span meets requirement, need to carry out test examination by the 1.5 of guideline lives times. Development along with aero engine technology level, the requirement in its life-span is also more and more longer, index of aging from before 300 hours, 500 hours, develop into is 2500 hours now, that have or even 5000 hours, as fuel-oil pump governor carried out life test by traditional test method again, manpower, time and financial resources can produce huge waste undoubtedly, and on the lead time, also can not meet requirement.

Therefore, how to solve the huge waste in the manpower, time and the financial resources that cause in conventional life test and the development test cycle is long, be a problem demanding prompt solution.

Summary of the invention

The invention provides the acceleration equivalent lifetime test method of a kind of fuel-oil pump governor, to solve the technical problem of huge waste in manpower, time and the financial resources caused in conventional life test and development test cycle length.

The technical solution used in the present invention is as follows:

The present invention provides the acceleration equivalent lifetime test method of a kind of fuel-oil pump governor, including step:

Fuel-oil pump governor to be measured is accelerated equivalent lifetime test, obtains the acceleration equivalent lifetime test period of fuel-oil pump governor to be measured;

According to default acceleration equivalent lifetime time map relation table, calculate the working time of fuel-oil pump governor to be measured; Wherein, accelerate equivalent lifetime time map relation table is mapped with the mapping relations accelerating equivalent lifetime test period and working time;

According to the working time calculated, it is determined that the time in service life of fuel-oil pump governor to be measured.

Further, accelerating the mapping relations of equivalent lifetime test period and working time is:

T=T_i·K

Wherein, T is for accelerating equivalent lifetime test period; T_iFor the working time, K is accelerator coefficient.

Further, the step that fuel-oil pump governor to be measured is accelerated equivalent lifetime test includes:

Utilize accelerator to improve the adnexa aging speed of fuel-oil pump governor to be measured and the rate of wear of metal under equivalence acceleration environment.

Further, accelerator is utilized to include to the step of the rate of wear of the adnexa aging speed and metal that accelerate fuel-oil pump governor to be measured:

Improve fuel oil temperature to accelerate the degree of aging of the rubber of fuel-oil pump governor to be measured under accelerating equivalent temperature.

Further, the aging acceleration equivalent lifetime time of the rubber of fuel-oil pump governor to be measured and the mapping relations of aging working time are expressed as:

$t_0=\underset{i=1}{\overset{i=p}{\Σ}}\frac{t_i}{K_i}\[\%\]$

Wherein, t₀For the rubber of fuel-oil pump governor to be measured at the aging acceleration equivalent lifetime time accelerated under equivalent temperature, t_iIt is the aging working time at the i-th temperature, K_iFor accelerating under equivalent temperature the relative acceleration coefficient of aging working time under aging acceleration equivalent lifetime time and the i-th temperature, p is temperature exponent number.

Further, acceleration factor is:

$K_i=B\left(T\right)\underset{j=1}{\overset{j=n}{\Π}}{X_j}^{\′}$

Wherein, X_j' it is in j temperature range, the aging accelerator coefficient of the rubber of fuel-oil pump governor to be measured, T is for accelerating equivalent lifetime test oil temperature, B (T), under accelerating equivalent lifetime test oil temperature condition, fires the aging accelerator coefficient of rubber of the fuel-oil pump governor to be measured that dissolved water in fuel causes; N is on the interval of the acceleration equivalent temperature chosen and ordinary temperature, the quantity of 10 DEG C of temperature section fuel-oil pump governors to be measured.

Further, the aging accelerator coefficient of rubber of the fuel-oil pump governor to be measured that combustion dissolved water in fuel causes is:

$B\left(T\right)={\mathrm{Ae}}^{\frac{T}{K1}}$

Wherein, A is constant, and A is equal to 0.83; K is constant, and K is equal to 113; T is equivalent temperature in test.

Further, fuel oil temperature is expressed as with the relational expression of the temperature of fuel-oil pump governor to be measured:

$T_{in}=\frac{T^{*}-0.12T_0-0.06\mathrm{\Δ}P}{0.88}$

Wherein, T_inFor fuel oil temperature, T^*For the temperature of fuel-oil pump governor to be measured, T₀For ambient temperature; Δ P is the front and back pressure reduction of the gear pump of fuel-oil pump governor to be measured.

Further, accelerator is utilized to include to the step of the rate of wear of the adnexa aging speed and metal that accelerate fuel-oil pump governor to be measured:

Improve fuel pressure to accelerate the degree of wear of the accelerating gear pump of fuel-oil pump governor to be measured under accelerating equivalence wear intensity.

Further, the step that fuel-oil pump governor to be measured is accelerated equivalent lifetime test includes:

Improve the content of combustion dissolved water in fuel to accelerate the parts depreciation amount of fuel-oil pump governor to be measured under accelerating equivalence wear intensity.

Further, the step that fuel-oil pump governor to be measured is accelerated equivalent lifetime test includes:

In accelerating equivalent lifetime test, keep test profile and the actually used section concordance of fuel-oil pump governor to be measured and keep electromagnetic valve switch number of times and concordance time actually used.

The method have the advantages that

The acceleration equivalent lifetime test method of the fuel-oil pump governor that the present invention proposes, by fuel-oil pump governor to be measured being accelerated equivalent lifetime test, utilize the mapping relations accelerating equivalent lifetime test period and working time, calculate the working time of fuel-oil pump governor to be measured accordingly, and according to the working time calculated, it is determined that the time in service life of fuel-oil pump governor to be measured, compared with conventional life test, shorten test period, thus saving experimentation cost; And improve the Development Schedule of fuel-oil pump governor.

Except purpose described above, feature and advantage, the present invention also has other purpose, feature and advantage. Below with reference to figure, the present invention is further detailed explanation.

Accompanying drawing explanation

The accompanying drawing constituting the part of the application is used for providing a further understanding of the present invention, and the schematic description and description of the present invention is used for explaining the present invention, is not intended that inappropriate limitation of the present invention.In the accompanying drawings:

Fig. 1 is the schematic flow sheet of the acceleration equivalent lifetime test method preferred embodiment of fuel-oil pump governor of the present invention.

Detailed description of the invention

It should be noted that when not conflicting, the embodiment in the application and the feature in embodiment can be mutually combined. Describe the present invention below with reference to the accompanying drawings and in conjunction with the embodiments in detail.

With reference to Fig. 1, the preferred embodiments of the present invention provide the acceleration equivalent lifetime test method of a kind of fuel-oil pump governor, including step:

Step S100, fuel-oil pump governor to be measured is accelerated equivalent lifetime test, obtain the acceleration equivalent lifetime test period of fuel-oil pump governor to be measured.

Accelerate equivalent lifetime testing equipment and fuel-oil pump governor to be measured is accelerated equivalent lifetime test, wherein, accelerating equivalent lifetime test is promote product to be measured to lose efficacy in a short time with the Fast Evaluation product to be measured reliability under normal running conditions or condition of storage in the way of equivalence. And the life test of routine is the test evaluating life of product feature to be measured, for obtaining the out-of-service time of product to be measured under the test environment set. Such as utilize accelerator to improve the adnexa aging speed of fuel-oil pump governor to be measured and the rate of wear of metal to obtain the life-span of fuel-oil pump governor to be measured under equivalence acceleration environment, specifically, fuel oil temperature can be improved to accelerate the degree of aging of the rubber of fuel-oil pump governor to be measured under accelerating equivalent temperature, it is also possible to improve fuel pressure to accelerate the degree of wear of the accelerating gear pump of fuel-oil pump governor to be measured under accelerating equivalence wear intensity. The content of combustion dissolved water in fuel can also be improved to accelerate the parts depreciation amount of fuel-oil pump governor to be measured under accelerating equivalence wear intensity. Wherein, the equivalents accelerating equivalent lifetime test is keep test profile and the actually used section concordance of fuel-oil pump governor to be measured in accelerating equivalent lifetime test and keep electromagnetic valve switch number of times and concordance time actually used.

The acceleration equivalent lifetime time map relation table that step S200, basis are preset, calculates the working time of fuel-oil pump governor to be measured; Wherein, accelerate equivalent lifetime time map relation table is mapped with the mapping relations accelerating equivalent lifetime test period and working time.

Accelerate equivalent lifetime testing equipment according to the acceleration equivalent lifetime time map relation table preset, calculate the working time of fuel-oil pump governor to be measured; Wherein, accelerate equivalent lifetime time map relation table is mapped with the mapping relations accelerating equivalent lifetime test period and working time. Accelerating the mapping relations of equivalent lifetime test period and working time is:

T=T_i·K(1)

Wherein, T is for accelerating equivalent lifetime test period; T_iFor the working time.

The working time that step S300, basis calculate, it is determined that the time in service life of fuel-oil pump governor to be measured.

Accelerating equivalent lifetime testing equipment according to the working time calculated, determine the time in service life of fuel-oil pump governor to be measured, specifically, in the present embodiment, the working time calculated is the time in service life of fuel-oil pump governor to be measured.

The acceleration equivalent lifetime test method of the fuel-oil pump governor that the present embodiment proposes, by fuel-oil pump governor to be measured is accelerated equivalent lifetime test, obtains the acceleration equivalent lifetime test period of fuel-oil pump governor to be measured; According to default acceleration equivalent lifetime time map relation table, calculate the working time of fuel-oil pump governor to be measured;Wherein, accelerate equivalent lifetime time map relation table is mapped with the mapping relations accelerating equivalent lifetime test period and working time; According to the working time calculated, it is determined that the time in service life of fuel-oil pump governor to be measured. The present embodiment by being accelerated equivalent lifetime test to fuel-oil pump governor to be measured, utilize the mapping relations accelerating equivalent lifetime test period and working time, calculate the working time of fuel-oil pump governor to be measured accordingly, and according to the working time calculated, determine the time in service life of fuel-oil pump governor to be measured, compared with the working time, shorten test period, thus saving experimentation cost; And improve the Development Schedule of fuel-oil pump governor.

The acceleration equivalent lifetime test method of the fuel-oil pump governor that the present embodiment proposes, the computational methods accelerating equivalent implementations and equivalence accelerated aging time of fuel-oil pump governor to be measured are as follows:

One, fuel oil temperature is improved

A) calculating of fuel-oil pump governor temperature to be measured

Rubber aging speed is accelerated with the raising of temperature, improves fuel oil temperature and mainly examines the ageing time of rubber, and the aging acceleration equivalent lifetime time of the rubber of fuel-oil pump governor to be measured and the mapping relations of aging working time are expressed as:

1, aging acceleration equivalent lifetime time t₀

$t_0=\underset{i=1}{\overset{i=p}{\Σ}}\frac{t_i}{K_i}\[\%\]---\left(2\right)$

Wherein, t₀For the rubber of fuel-oil pump governor to be measured at the aging acceleration equivalent lifetime time accelerated under equivalent temperature, t_iIt is the aging working time at the i-th temperature, K_iFor accelerating under equivalent temperature the relative acceleration coefficient of aging working time under aging acceleration equivalent lifetime time and the i-th temperature, p is temperature exponent number, and % is unit.

2, acceleration factor is:

$K_i=B\left(T\right)\underset{j=1}{\overset{j=n}{\Π}}{X_j}^{\′}---\left(3\right)$

Wherein, X_j' it is in j temperature range, the aging accelerator coefficient of the rubber of fuel-oil pump governor to be measured, T is for accelerating equivalent lifetime test oil temperature, B (T), under accelerating equivalent lifetime test oil temperature condition, fires the aging accelerator coefficient of rubber of the fuel-oil pump governor to be measured that dissolved water in fuel causes; N is on the interval of the acceleration equivalent temperature chosen and ordinary temperature, the quantity of 10 DEG C of temperature section fuel-oil pump governors to be measured.

3, the aging accelerator coefficient of rubber of the fuel-oil pump governor to be measured that combustion dissolved water in fuel causes is:

$B\left(T\right)={\mathrm{Ae}}^{\frac{T}{K}}---\left(4\right)$

Wherein, A is constant, and A is equal to 0.83; K is constant, and K is equal to 113; T is equivalent temperature in test.

Wherein, aging coefficient X_iValue specifically as shown in table 1:

Temperature stage	Temperature range (DEG C)	The aging coefficient X of this temperature stagei
			1	60～70	2.6
2	50～60	2.31
			3	40～50	1.95
4	30～40	1.61
			5	20～30	1.27

Table 1 is the aging coefficient of rubber in the i-th temperature range

B) calculating of fuel oil temperature

In equivalence accelerated test, can pass through to improve fuel oil temperature T_inEnsure the temperature T of fuel-oil pump governor to be measured^*. The relational expression of the temperature of fuel oil temperature and fuel-oil pump governor to be measured is expressed as:

$T_{in}=\frac{T^{*}-0.12T_0-0.06\mathrm{\Δ}P}{0.88}---\left(5\right)$

Wherein, T_inFor fuel oil temperature, T^*For the temperature of fuel-oil pump governor to be measured, T₀For ambient temperature; Δ P is the average pressure reduction on oil suction component, is exactly the front and back pressure reduction of gear pump for fuel-oil pump governor.

Two, the content of combustion dissolved water in fuel (steam) is improved

In order to improve the parts depreciation amount of fuel-oil pump governor to be measured in equivalence accelerated life test, should dissolving a certain amount of water in fuel oil, its accelerated wear test coefficient formula is as follows:

$K_{\∂}=\frac{(1+a_{tu}\·{\mathrm{\Δt}}_u)(1+a_{pu}\·{\mathrm{\Δp}}_u)(1+a_{bu}\·{\mathrm{\Δc}}_{bu})}{(1+a_{t\∂}\·{\mathrm{\Δt}}_{\∂})(1+a_{p\∂}\·{\mathrm{\Δp}}_{\∂})(1+a_{b\∂}\·{\mathrm{\Δc}}_{b\∂})}{K}_{\mathrm{\τ}}{K}_Q---\left(6\right)$

Wherein:For accelerated wear test coefficient;

Δt_u=(t_u-60) DEG C;

ΔP_u=(P_u-1)Kg/cm²;

ΔC_bu=(C_b-0.004) %, by quality;

${\mathrm{\ΔP}}_{\∂}=(P_{\∂}-1)Kg/{\mathrm{cm}}^2;$

${\mathrm{\ΔC}}_{b\∂}=(C_{b\∂}-0.004)\%,$ By quality;

In accelerated test, the fuel oil temperature of fuel-oil pump governor porch;

In accelerated test, fuel-oil pump governor fuel oil dissolves the content of water;

In accelerated test, the pressure of fuel-oil pump governor porch;

K_τWorking media in accelerated aging test, the variation coefficient of wear resistance, often cross within 100 hours, change fuel oil completely when, K_τ=0.74;

K_QRely on the coefficient changing part load and affect tear strength change.

a_tuFor constant, and a_tu=0.026; a_buFor constant, and a_bu=215; a_puFor constant, and a_pu=0.32;For constant, and $a_{t\∂}=-0.013,$ For constant, and $a_{b\∂}=-215,$ For constant, and $a_{p\∂}=\mathrm{0.72.}$

Three, fuel pressure is improved

Because the wear extent of the driving and driven gear of fuel-oil pump governor to be measured and side plate, gear pump chamber is affected bigger by fuel pressure. For ensureing that the parts such as gear meet the requirement of reality wear extent in accelerated test, generally fuel pressure is improved 0.25MPa.

These are only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations. All within the spirit and principles in the present invention, any amendment of making, equivalent replacement, improvement etc., should be included within protection scope of the present invention.

Claims (10)

1. the acceleration equivalent lifetime test method of a fuel-oil pump governor, it is characterised in that include step:

Fuel-oil pump governor to be measured is accelerated equivalent lifetime test, obtains the acceleration equivalent lifetime test period of fuel-oil pump governor to be measured;

According to default acceleration equivalent lifetime time map relation table, calculate the working time of fuel-oil pump governor to be measured; Wherein, described acceleration equivalent lifetime time map relation table is mapped with the mapping relations accelerating equivalent lifetime test period and working time;

According to the working time calculated, it is determined that the time in service life of fuel-oil pump governor to be measured.

2. the acceleration equivalent lifetime test method of fuel-oil pump governor according to claim 1, it is characterised in that

The mapping relations of described acceleration equivalent lifetime test period and working time are:

T=T_i·K

Wherein, T is for accelerating equivalent lifetime test period; T_iFor the working time, K is accelerator coefficient.

3. the acceleration equivalent lifetime test method of fuel-oil pump governor according to claim 1, it is characterised in that

The described step that fuel-oil pump governor to be measured is accelerated equivalent lifetime test includes:

Utilize accelerator to improve the adnexa aging speed of fuel-oil pump governor to be measured and the rate of wear of metal under equivalence acceleration environment.

4. the acceleration equivalent lifetime test method of fuel-oil pump governor according to claim 3, it is characterised in that

Described accelerator is utilized to include to the step of the rate of wear of the adnexa aging speed and metal that accelerate fuel-oil pump governor to be measured:

Improve fuel oil temperature to accelerate the degree of aging of the rubber of fuel-oil pump governor to be measured under accelerating equivalent temperature.

5. the acceleration equivalent lifetime test method of fuel-oil pump governor according to claim 4, it is characterised in that

The aging acceleration equivalent lifetime time of the rubber of described fuel-oil pump governor to be measured and the mapping relations of aging working time are expressed as:

$t_0=\underset{i=1}{\overset{i=p}{\Σ}}\frac{t_i}{K_i}\[\%\]$

Wherein, t₀For the rubber of fuel-oil pump governor to be measured at the aging acceleration equivalent lifetime time accelerated under equivalent temperature, t_iIt is the aging working time at the i-th temperature, K_iFor accelerating under equivalent temperature the relative acceleration coefficient of aging working time under aging acceleration equivalent lifetime time and the i-th temperature, p is temperature exponent number.

6. the acceleration equivalent lifetime test method of fuel-oil pump governor according to claim 5, it is characterised in that

Described acceleration factor is:

$K_i=B\left(T\right)\underset{j=1}{\overset{j=n}{\Π}}{X_j}^{\′}$

Wherein, X_j' it is in j temperature range, the aging accelerator coefficient of the rubber of fuel-oil pump governor to be measured, T is for accelerating equivalent lifetime test oil temperature, B (T), under accelerating equivalent lifetime test oil temperature condition, fires the aging accelerator coefficient of rubber of the fuel-oil pump governor to be measured that dissolved water in fuel causes; N is on the interval of the acceleration equivalent temperature chosen and ordinary temperature, the quantity of 10 DEG C of temperature section fuel-oil pump governors to be measured.

7. the acceleration equivalent lifetime test method of fuel-oil pump governor according to claim 6, it is characterised in that

The aging accelerator coefficient of rubber of the fuel-oil pump governor to be measured that described combustion dissolved water in fuel causes is:

$B\left(T\right)={\mathrm{Ae}}^{\frac{T}{K_1}}$

Wherein, A is constant, and A is equal to 0.83; K₁For constant, and K₁Equal to 113; T is equivalent temperature in test.

8. the acceleration equivalent lifetime test method of fuel-oil pump governor according to claim 7, it is characterised in that

The relational expression of the temperature of described fuel oil temperature and fuel-oil pump governor to be measured is expressed as:

$T_{in}=\frac{T^{*}-0.12T_0-0.06\mathrm{\Δ}P}{0.88}$

Wherein, T_inFor fuel oil temperature, T^*For the temperature of fuel-oil pump governor to be measured, T₀For ambient temperature; Δ P is the front and back pressure reduction of the gear pump of fuel-oil pump governor to be measured.

9. the acceleration equivalent lifetime test method of fuel-oil pump governor according to claim 3, it is characterised in that

Described accelerator is utilized to include to the step of the rate of wear of the adnexa aging speed and metal that accelerate fuel-oil pump governor to be measured:

Improve fuel pressure to accelerate the degree of wear of the accelerating gear pump of fuel-oil pump governor to be measured under accelerating equivalence wear intensity.

10. the acceleration equivalent lifetime test method of fuel-oil pump governor according to claim 3, it is characterised in that

The described step that fuel-oil pump governor to be measured is accelerated equivalent lifetime test includes:

Improve the content of combustion dissolved water in fuel to accelerate the parts depreciation amount of fuel-oil pump governor to be measured under accelerating equivalence wear intensity.