A module-level accelerated storage test method based on the Aronitz equation

Abstract

This invention discloses a module-level accelerated storage test method based on the Aronitz equation, belonging to the field of accelerated storage test technology. The method selects the minimum of the highest stress levels of the entire aircraft contained within the module as the accelerated stress level for the module's accelerated storage test; calculates the accelerated storage test time required for each aircraft's corresponding storage period index, and takes the minimum of all aircraft's accelerated storage test times as the test time for the module's accelerated storage test; calculates the supplementary accelerated storage test time required after the aircraft participates in the module's accelerated storage test based on the aircraft's information; conducts accelerated storage tests and simulated flight verification tests based on the calculation results, and provides a storage period assessment conclusion after the tests are passed. This invention combines module-level accelerated storage with supplementary acceleration for the entire aircraft, conducting test verification on both the entire aircraft and modules, resulting in a more reliable storage period conclusion.

Description

Technical Field

[0001] This invention belongs to the field of accelerated storage testing technology, specifically relating to a compartment-level accelerated storage testing method based on the Aronitz equation. Background Technology

[0002] Accelerated storage testing, without altering the product's failure mechanism, accelerates failure by increasing stress, and calculates the storage period under normal stress levels based on an accelerated model. Domestic and international research indicates that accelerated storage testing of lower-level products cannot reflect the true failure situation of higher-level products. Some failure phenomena exposed in higher-level products are difficult to reflect through accelerated storage testing of their constituent lower-level products. Conducting accelerated storage testing on compartments not only allows for simultaneous testing of multiple types of equipment, improving failure efficiency, but also enhances the accuracy of assessment conclusions.

[0003] The compartment typically contains different types of products, such as electronic products, electromechanical products, elastic elements, and structural components. During the accelerated storage process using temperature, different products have different sensitivities to temperature, which can lead to "over-aging" or "under-aging" problems during the accelerated storage test. This makes the accelerated storage test of the compartment difficult. Summary of the Invention

[0004] In view of this, the present invention provides a compartment-level accelerated storage test method based on the Aronitz equation, which effectively solves the problems of "over-aging" or "under-aging" in the prior art by combining compartment acceleration with whole-machine compensation acceleration.

[0005] A module-level accelerated storage test method based on the Aronitz equation, the steps of which are as follows:

[0006] Step 1: Determine the acceleration stress level of the compartment;

[0007] Step 2: Calculate the acceleration time of the compartment;

[0008] Step 3: Calculate the compensation acceleration time for the entire machine (or component);

[0009] Step 4: Determine the sequence of accelerated storage tests for modules and the entire aircraft based on the levels of the simulated flight verification tests.

[0010] Furthermore, the process of determining the acceleration stress level of the compartment in step one is as follows:

[0011] Suppose a section contains p types of complete machines (or components), and each complete machine (or component) can withstand a maximum stress level of T1, T2, ..., T. p Then take

[0012] TS =min{T i :1≤i≤p} (1)

[0013] As the acceleration stress level of the compartment.

[0014] Furthermore, the process of calculating the acceleration time of the compartment in step two is as follows:

[0015] Record the accelerated aging test time of the whole machine (or component) i. Let t be an example. i,0 E i Let T be the required storage period index and activation energy for the i-th type of complete machine. S The following test time:

[0016]

[0017] In the formula, T0 is the storage temperature (K);

[0018] t i,0 E i Let be the storage period requirements and activation energy of the i-th type of complete machine.

[0019] The compartment is in T S The acceleration time is:

[0020]

[0021] In the formula, Calculated using equation (2).

[0022] Furthermore, the process of calculating the compensated acceleration time of the whole machine (or component) in step three is as follows:

[0023] The acceleration stress level T of the whole machine (or component) i in the compartment S When the compensation acceleration is applied, the test time for the compensation acceleration is:

[0024]

[0025] In the formula, Calculated from equation (2), Calculated using equation (3).

[0026] The whole machine (or component) i at a higher acceleration stress level T i，A Down (T) S <T i，A ≤T i When performing compensated acceleration, the test time for compensated acceleration is...

[0027]

[0028] In the formula, T0 and t i,0 E i The meaning is the same as in equation (2). Calculated using equation (3).

[0029] Furthermore, in step four, during the simulated flight verification test of the entire aircraft, the cabin section is subjected to an acceleration stress level T. S Downward acceleration The time is used to test the functional performance of the compartment. If it passes the test, the compartment is disassembled into a complete machine (or component). The complete machine (or component) is then subjected to accelerated stress level T. i，A (or T) S (Acceleration) (or t) i If the functional performance of each part (or component) is qualified after conducting flight simulation verification tests, a conclusion on the storage period of the compartment is given; when conducting flight simulation verification tests on the compartment, the whole machine (or component) is subjected to acceleration stress level T. i，A (or T) S (Acceleration) (or t) i After passing the test, the entire machine (or components) is assembled into a compartment, and the compartment is subjected to accelerated stress level T. S Downward acceleration If the functional performance of the module is qualified, a conclusion on the storage period of the module is given after conducting simulated flight verification tests.

[0030] Beneficial effects:

[0031] 1. This invention adopts a combination of compartment acceleration and whole machine (or component) supplementary acceleration, which solves the problem that when the whole machine is accelerated separately, the connection parts and stress between equipment cannot be assessed, resulting in incomplete testing. When the compartment is accelerated according to a certain acceleration factor, the whole machine (or component) may have "over-aging" or "under-aging" problems due to the large difference in aging rate between different products. The storage period conclusion given is more reliable.

[0032] 2. Based on the Aronitz equation, this invention selects the minimum value of the highest stress level of the whole machine (or components) contained in the compartment as the acceleration stress level for the compartment's accelerated storage test, which helps to improve the accuracy of the acceleration time calculation for the compartment.

[0033] 3. This invention calculates the accelerated storage test time required for each complete unit (or component) according to its corresponding storage period index, and takes the minimum value of the accelerated storage test time for all (or components) as the test time for the accelerated storage test of the compartment. Based on the information of the (or component), the test time for supplementary accelerated storage tests that still need to be conducted after participating in the compartment accelerated storage test is calculated. By combining compartment acceleration with complete unit (or component) compensatory acceleration, the problem of "over-aging" or "under-aging" in existing compartment accelerated storage tests is effectively solved. Attached Figure Description

[0034] Figure 1 This is a flowchart of the steps of the compartment-level accelerated storage test method of the present invention. Detailed Implementation

[0035] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0036] Example 1:

[0037] The principle of the method of this invention:

[0038] The Svandte Arrhenius equation is the most commonly used model for temperature stress acceleration, and it is expressed as follows:

[0039]

[0040] In the formula, L: lifetime characteristic; k: constant (determined by experiment); E: activation energy (cal / mol); R: ideal gas constant (R=1.987cal / mol); T: absolute temperature K.

[0041] The highest stress level in accelerated storage testing refers to the maximum stress value that does not change the failure mechanism of the test specimen. The compartment contains different types of products, each of which can withstand different temperature stresses.

[0042] As attached Figure 1 As shown, the implementation steps of the compartment-level accelerated storage test method based on the Aronitz equation of the present invention are as follows:

[0043] Step 1: Determine the acceleration stress level of the compartment;

[0044] Suppose a section contains p types of complete machines (or components), and each complete machine (or component) can withstand a maximum stress level of T1, T2, ..., T. p Then take

[0045] T S =min{T i :1≤i≤p}

[0046] As the highest accelerating stress in the compartment, all the products contained in the compartment can withstand it, and the accelerating stress level at this time is the highest, which is conducive to improving the test efficiency.

[0047] Step 2: Calculate the acceleration time of the compartment;

[0048] Record the accelerated aging test time of the whole machine (or component) i. Let t be an example. i,0 E i Let T be the required storage period index and activation energy for the i-th type of complete machine. S The acceleration factor relative to the normal stress level T0 is

[0049]

[0050] Therefore, the whole machine (or component) i at the accelerated stress level T S Test duration:

[0051]

[0052] In the formula, T0 is the storage temperature (K).

[0053] According to the statistical scheme for high-risk timed tests (scheme number 21) specified in GJB899AGJB 899A-2009 "Reliability Qualification and Acceptance Test", if two samples have a test time of 1.1 times the index value without failure, the qualification conclusion is passed. In the process of evaluating the storage period, 1.1 times is also taken.

[0054] For the compartment at stress level T S During accelerated aging, due to different activation energies, the accelerated aging test time for each complete machine (or component) i varies. The requirements vary, and to avoid "over-aging," the acceleration time for each section should be the same as the accelerated aging test time for each complete machine (or component). The minimum value, that is, the section at T S The acceleration time is:

[0055]

[0056] For a given machine (or component) i, at the accelerated stress level T S The aging process to t i,0 The required test time is The actual time spent in the aging test of the compartment is because Therefore, it is in a "under-aged" state. Therefore, it needs to be compensated and accelerated by the whole machine (or components) to reach the required aging time. i,0 Given the current state, the test time for compensation acceleration is now calculated.

[0057] Step 3: Calculate the compensation acceleration time for the entire machine (or component);

[0058] The acceleration stress level T of the whole machine (or component) i in the compartment S When the compensation acceleration is applied, the test time for the compensation acceleration is:

[0059]

[0060] For a specific machine (or component) i, at the accelerated stress level T in the compartment... S The compensation-accelerated aging time is very long, i.e., t iS -t S When the value is large, in order to improve the test efficiency, the compensation accelerated aging of the whole machine needs to be set to a higher accelerated stress level T, depending on the actual situation. i，A (T S <T i，A ≤T i The experiment was conducted under these conditions.

[0061] The whole machine (or component) i at the accelerated temperature T in the compartment S conduct After accelerated aging over time, the required further accelerated aging time at this stress level is...

[0062]

[0063] At a higher accelerating stress level T i，A (T S <T i，A ≤T i When accelerating under these conditions, the acceleration stress level T is recorded. i，A Relative to the accelerating stress level T S The acceleration factor is Therefore, the required compensation for accelerated aging time is:

[0064]

[0065] In the formula, E i : is the activation energy; For the whole machine (or component) i at the accelerated stress level T i，A Relative to the accelerating stress level T S Acceleration factor.

[0066] Step four: Conduct accelerated storage tests and simulated flight verification tests on the two sets of products. Based on the level of the simulated flight verification test, determine the sequence of accelerated storage tests for the modules and the entire aircraft.

[0067] 1) When conducting simulated flight verification tests on the entire aircraft, the cabin section will be subjected to acceleration stress level T.S Downward acceleration The time is used to test the functional performance of the compartment. If it passes the test, the compartment is disassembled into a complete machine (or component). The complete machine (or component) is then subjected to accelerated stress level T. i，A (or T) S (Acceleration) (or t) i If the functional performance of each complete machine (or component) is qualified after conducting flight simulation flight verification tests, the storage period of the compartment will be determined.

[0068] 2) When conducting simulated flight verification tests on the cabin section, the entire machine (or component) will be subjected to accelerated stress level T. i，A (or T) S (Acceleration) (or t) i After passing the test, the entire machine (or components) is assembled into a compartment, and the compartment is subjected to accelerated stress level T. S Downward acceleration If the functional performance of the module is qualified, a conclusion on the storage period of the module is given after conducting simulated flight verification tests.

[0069] It is evident that arranging two modules at the accelerated stress level T S Next to carry out Accelerated storage tests were conducted on the entire machine (components) constituting the compartment at accelerated stress level T. i，A (or T) S ) under (or t) i The accelerated storage test, in which all products are accelerated to the required lifespan and the entire machine (component) or compartment passes the simulated flight verification test, indicates that two products, after being accelerated to 1.1 times the lifespan index value, still meet the usage requirements and are fault-free. According to the high-risk timed test statistical scheme (scheme number 21) specified in GJB899AGJB899A-2009 "Reliability Qualification and Acceptance Test", a conclusion on the storage period can be given.

[0070] In summary, the above are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A module-level accelerated storage test method based on the Aronitz equation, characterized in that, The steps to implement this method are as follows: Step 1: Determine the acceleration stress level of the compartment; Step 2: Calculate the acceleration time of the compartment; Step 3: Calculate the compensation acceleration time for the entire machine or component; Step 4: Determine the sequence of accelerated storage tests for modules and the entire aircraft based on the levels of the simulated flight verification tests; The process of determining the acceleration stress level of the compartment in step one is as follows: Assuming the compartment contains p The highest stress level that each complete machine or component can withstand is: T 1, T 2, ..., T p Then take T S =min{ T i :1≤ i ≤ p }(1) As the level of acceleration stress in the compartment; The process of calculating the acceleration time of the compartment in step two is as follows: Record the whole machine or component i Accelerated aging test time Let's assume t i,0 , E i For the first i The required values ​​for the storage period and activation energy of the complete machine are based on the stress level. T S The following test time: （2） In the formula, T 0 represents the storage temperature (K); t i,0 , E i For the first i Storage period requirements and activation energy of the complete machine; The compartment is T S The acceleration time is: （3） In the formula, Calculated using equation (2); The process of calculating the compensation acceleration time of the whole machine or component in step three is as follows: Complete machine or component i Acceleration stress level in the compartment T S When the compensation acceleration is applied, the test time for the compensation acceleration is: - （4） In the formula, Calculated from equation (2), Calculated using equation (3); Complete machine or component i At a higher acceleration stress level Down( T S < ≤ T i When performing compensated acceleration, the test time for compensated acceleration is... （5） In the formula, T 0、 t i,0 , E i The meaning is the same as in equation (2). Calculated using equation (3).

2. The compartment-level accelerated storage test method based on the Aronitz equation as described in claim 1, characterized in that, In step four, during the simulated flight verification test of the entire aircraft, the cabin section is subjected to accelerated stress levels. T S Downward acceleration The time frame is used to test the functional performance of the compartment. If it passes the test, the compartment is disassembled into a complete machine or component. The complete machine or component is then tested under accelerated stress. or T S Downward acceleration or If the functional performance of each complete machine or component is qualified after conducting flight simulation verification tests, a conclusion on the storage period of the compartment is given; when conducting flight simulation verification tests on the compartment, the complete machine or component is subjected to accelerated stress levels. or T S Downward acceleration or If the test is passed, the entire machine or components will be assembled into a compartment, and the compartment will be subjected to accelerated stress levels. T S Downward acceleration If the functional performance of the module is qualified, a conclusion on the storage period of the module is given after conducting simulated flight verification tests.

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