CN112560289A - Accelerated reliability test method and device - Google Patents
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Abstract
The application provides an accelerated reliability test method and device, and the method comprises the following steps: carrying out initial detection on the sample, wherein the initial detection comprises detecting whether the performance indexes and the like of the sample are normal or not; carrying out High Accelerated Life Test (HALT) on a sample qualified by initial detection to obtain a low-temperature operable threshold value, a high-temperature operable threshold value and a vibration magnitude operable threshold value; performing a high-accelerated stress screening test HASS on the sample according to a low-temperature operable threshold value, a high-temperature operable threshold value and a vibration magnitude operable threshold value; in the above steps, if the sample is found to be faulty, fault analysis is carried out, the fault is repaired, and if the sample is not found to be faulty, the stage test is continued until the whole HALT detection process and the whole HASS detection process are finished; the problem of overlong time consumed by the existing product reliability test in the product design and production stages can be solved, and the production efficiency of the product is improved.
Description
Technical Field
The application relates to the technical field of reliability tests, in particular to an accelerated reliability test method and device.
Background
Since the accelerated reliability test can enable a user to quickly determine the reliability of a product, the accelerated reliability test is an effective means in actual quality control. Accelerated reliability tests include the High Accelerated Life Test (HALT) and the high accelerated stress screening test (HASS). Wherein the HALT is used in the product design stage, and can rapidly expose the design defect so as to modify the design again and eliminate the defect, thereby reducing the maintenance cost. HASS is used during the production phase of the product and it can quickly expose any process defects. HALT and HASS can shorten the reliability test of new products which originally take 6 months or even 1 year to a week, and the product problems found in this week are almost identical to those found after the application by the client, therefore, the testing mode of HALT and HASS has become the necessary verification for the new products to pass before they come into the market.
The tests for HALT and HASS are less than conventional tests for environmental reliability, and the present application is directed to developing a set of commonly used tests for future reference and more standardized tests for HALT and HASS.
Disclosure of Invention
The application provides an accelerated reliability test method and device, which can solve the problem that the time consumed by the existing product reliability test is too long in the product design and production stages. The application provides the following technical scheme:
in a first aspect, a method for accelerated reliability testing is provided, the method comprising:
s1, carrying out initial detection on the sample, wherein the initial detection comprises detecting whether the performance index and the like of the sample are normal or not;
s2, carrying out HALT (high accelerated life test) on the sample qualified in the initial detection to obtain a low-temperature operable threshold, a high-temperature operable threshold and a vibration magnitude operable threshold, wherein the HALT comprises a low-temperature stepping stress test, a high-temperature stepping stress test, a rapid temperature change stress test, a vibration stepping stress test and a temperature and vibration comprehensive environment stress test;
s3, performing HASS on the sample according to the low-temperature operable threshold, the high-temperature operable threshold and the vibration magnitude operable threshold, wherein the HASS comprises a safety test, a validity test, a HASS program establishment, a precipitation screening and a verification screening;
in step S2 and step S3, if the sample is found to be faulty, a fault analysis is performed and the fault is repaired, and if the sample is not found to be faulty, the phase test is continued until the entire HALT detection process and the entire HASS detection process are completed.
Optionally, in the step S2, the vibration step stress test includes:
setting an initial vibration magnitude and a vibration step length, wherein the vibration step length is the vibration magnitude of each increase of the sample;
and performing durable vibration by using the initial vibration magnitude, performing function detection after vibrating for a period of time, if the function is normal, continuously increasing the vibration step length of the initial vibration magnitude until the sample fails, and determining the vibration magnitude before the failure as the operable limit value of the vibration magnitude.
Optionally, in the step S2, the temperature and vibration combined environmental stress test includes:
setting a low temperature limit value, a high temperature limit value, the initial vibration magnitude, a vibration limit value, the vibration step length and the temperature change rate;
circulating at the temperature change rate between the low temperature limit value and the high temperature limit value, increasing the initial vibration magnitude by the vibration step length, performing function detection after the sample vibrates for a period of time, and if the sample has a normal function, continuously increasing the initial vibration magnitude by the vibration step length until the sample fails;
wherein the vibration magnitude is less than or equal to the vibration threshold value.
Optionally, when the vibration magnitude reaches a fixed value or more, after each step of function detection is finished, the vibration magnitude is adjusted to the initial vibration magnitude and then function detection is performed again, wherein the fixed value is a high vibration magnitude damage value.
Optionally, the safety testing stage performs the temperature and vibration combined environment stress test, and performs function detection on the sample by using 80% of the low-temperature operable threshold as a first low-temperature value, 80% of the high-temperature operable threshold as a first high-temperature value, and 50% of the vibration magnitude operable threshold as a first vibration magnitude value, and performs the validity test if the sample is normal, and reduces the temperature and the vibration magnitude until the safety test is passed if the sample fails.
Optionally, the validity test comprises: and (3) making a fault on the sample which passes the safety test, carrying out the effectiveness test on the sample with the fault, observing whether the fault can be detected, if so, relaxing the test condition, and if not, tightening the test condition, wherein the test condition comprises temperature and vibration magnitude.
Optionally, the HASS program establishment comprises: and (3) carrying out 30 times of tests on the sample passing the validity test under the test condition, carrying out function detection, wherein if the functions are normal, the HASS program meets the test requirements, and if the functions are abnormal, checking and modifying the cycle number.
Optionally, the precipitation screening comprises: and (4) testing the sample according to the established HASS program, determining defects in the sample production process and making improvements.
Optionally, the validation screening comprises: subjecting the sample that passes the precipitation screen again to the safety test, the validation test, the HASS procedure establishment, and the precipitation screen, determining the sample's deficiencies in the precipitation screen and solving the problem.
In a second aspect, there is provided an accelerated reliability test apparatus, the apparatus comprising:
the electronic file management system EDM is used for recording the test conditions in the test process in real time;
a controller, wherein the controller comprises an HC-3000 control system, and the HC-3000 control system is in communication connection with the EDM;
the test box comprises a safety alarm device, a pneumatic vibration device, an electric heating device and a liquid nitrogen cooling device, and is in communication connection with the controller;
the temperature sensor measures the temperatures of the electric heating device and the liquid nitrogen cooling device and is in communication connection with the HC-3000 control system;
a vibration sensor measuring a magnitude of vibration of the pneumatic vibration device and communicatively coupled to the HC-3000 control system.
The beneficial effect of this application lies in: the method and the device for testing the accelerated reliability solve the problem that the conventional product reliability test consumes too long time in the design and production stages of the product by using the HALT and HASS test methods to detect the product in the design and production stages of the product, and improve the production efficiency of the product.
The present application provides a general method of HALT and HASS testing for future reference and more specification of HALT and HASS testing.
The foregoing description is only an overview of the technical solutions of the present application, and in order to make the technical solutions of the present application more clear and clear, and to implement the technical solutions according to the content of the description, the following detailed description is made with reference to the preferred embodiments of the present application and the accompanying drawings.
Drawings
FIG. 1 is a schematic structural diagram of an accelerated reliability testing apparatus according to an embodiment of the present application;
fig. 2 is a flowchart of an accelerated reliability testing method according to an embodiment of the present application.
Detailed Description
The following detailed description of embodiments of the present application will be described in conjunction with the accompanying drawings and examples. The following examples are intended to illustrate the present application but are not intended to limit the scope of the present application.
Fig. 1 is a schematic structural diagram of an accelerated reliability testing apparatus provided in an embodiment of the present application, where the apparatus at least includes:
the Electronic document management system 1(Electronic document management, EDM) is configured to record test conditions in a test process in real time, where the test conditions include temperature and vibration magnitude in the test process.
The control instrument comprises an HC-3000 control system 2, wherein the HC-3000 control system 2 is in communication connection with the EDM1 through a network cable; the HC-3000 control system 2 includes an I/O control system 21, a D/A conversion system 22, and an A/D conversion system 23.
The HC-3000 control system 2 includes a test configuration window (not shown) for setting options and parameters during the trial. For example, the parameters of the temperature sensor 4, the parameters of the vibration sensor 5, the vibration frequency range, the alarm value, the default slope, etc. are set through the test configuration window.
The HC-3000 control system 2 adopts PID control and is used for setting a temperature PID value, a vibration magnitude PID value, a control period, a temperature intervention range, self-setting and the like, in the embodiment, the control period is default to 2s, the temperature intervention range is default to 5 ℃ self-setting and default to ON, as for the vibration step length, the temperature step length, the cycle number and the like, the vibration step length, the temperature step length, the cycle number and the like can be set according to actual test conditions, and the embodiment does not limit the same.
The test box 3 comprises a safety alarm device 31, a pneumatic vibration device 32, an electric heating device 33 and a liquid nitrogen cooling device 34, and the test box 3 is in communication connection with the controller; the safety alarm device 31 is in communication connection with the I/O control system 21, the I/O control system 21 is used for sending an alarm instruction to the safety alarm device 31, the safety alarm device 31 sends out alarm information after receiving the alarm instruction, and then the sent alarm information is fed back to the I/O control system 21; the pneumatic vibration device 32, the electric heating device 33 and the liquid nitrogen cooling device 34 are in communication connection with the D/A conversion system 22, the pneumatic vibration device 32 is used for controlling the sample to vibrate, the electric heating device 33 is used for heating the sample, the liquid nitrogen cooling device 34 is used for cooling the sample, and the D/A conversion system 22 is used for converting digital signals in the HC-3000 control system 2 into analog signals which can be recognized by the pneumatic vibration device 32, the electric heating device 33 and the liquid nitrogen cooling device 34.
The safety alarm device 31 may be a buzzer or an indicator lamp. Of course, the safety alarm device 31 may be other, and the present application does not limit this.
In this embodiment, the test chamber 3 has model number HH-900-: temperature range: -100 ℃ to +200 ℃, maximum rate of temperature change: 60 ℃/min, maximum vibration magnitude: 80 Grms. Of course, the model of the test chamber 3 may be other models equivalent to HH-900-.
And the temperature sensor 4 is used for measuring the temperatures of the electric heating device 33 and the liquid nitrogen cooling device 34, is in communication connection with the HC-3000 control system 2, and sends the measured temperature values to the HC-3000 control system 2. Wherein the temperature sensor 4 is in communication connection with the a/D conversion system 23 in the HC-3000 control system 2 for converting the digital signals in the sensor into analog signals recognizable by the HC-3000 control system 2.
And the vibration sensor 5 is used for measuring the vibration magnitude of the pneumatic vibration device 32, is in communication connection with the HC-3000 control system 2, and transmits the measured vibration magnitude to the HC-3000 control system 2. Wherein the vibration sensor 5 is communicatively connected to the a/D conversion system 23 in the HC-3000 control system 2 for converting the digital signals in the sensor to analog signals recognizable by the HC-3000 control system 2.
For better experimentation, it is necessary to build a database to store and access test configuration data prior to experimentation. Therefore, in the present embodiment, a database needs to be created before the HC-3000 control system 2 is created.
The application provides through an accelerated reliability test device, can solve the problem of the current product reliability test consumed time overlength in the design and production stage of product, improved the production efficiency of product.
Fig. 2 is a flowchart of an acceleration reliability testing method according to an embodiment of the present application, and the present embodiment is described by taking as an example that the method is applied to the acceleration reliability testing apparatus shown in fig. 1. The method at least comprises the following steps:
Checking the functions of the sample under the ambient condition of normal temperature, measuring the performance index of the sample, and confirming whether the sample is normal; if yes, go to step 202, otherwise, repair the sample or replace it with a new one.
The low-temperature stepping stress test comprises the following steps: setting initial temperature and low-temperature step length, and starting a test; cooling by a set low-temperature step length, performing function detection after the temperature is stable, and performing function detection after a period of time is properly kept during an actual test; if the function is normal, the low-temperature step length is continuously reduced until the sample fails, the function of the sample can be recovered after the temperature is recovered to the normal temperature, and a temperature value before the failure is the low-temperature operable limit T1(ii) a Continuously reducing the temperature until the function of the sample can not be recovered after the sample is recovered to the normal temperature, wherein the temperature value at the moment is the low-temperature damage limit; in this embodiment, the initial temperature is set to 20 ℃, and the low temperature step size is set to 10 ℃. Of course, in other embodiments, the starting temperature and the low temperature step may be set to be other, and the application does not limit this.
The high-temperature stepping stress test comprises the following steps: setting an initial temperature and a high-temperature step length, and starting a test; heating with a set high-temperature step length, performing function detection after the temperature is stable, and performing function detection after a period of time is properly kept during an actual test; if the function is normal, the high-temperature step length is continuously increased until the sample fails, the function of the sample can be recovered after the temperature is recovered to the normal temperature, and then the function before the failureOne temperature value is the high temperature operational limit Th(ii) a Continuously raising the temperature until the function of the sample can not be recovered after the sample is recovered to the normal temperature, wherein the temperature value at the moment is a high-temperature damage limit; in this embodiment, the initial temperature is set to 20 ℃, and the high temperature step size is set to 10 ℃. Of course, in other embodiments, the starting temperature and the low temperature step may be set to be other, and the application does not limit this.
The rapid temperature change stress test comprises the following steps: setting a high temperature threshold value, a low temperature threshold value, an initial temperature change rate and a temperature change rate step length, and starting a test; performing temperature cycle tests at a set temperature change rate, performing function detection after the temperature is stabilized in each cycle, and performing function detection after a period of time is properly kept during actual tests; if the function is normal, recording the temperature change rate m ℃/min at the moment, if the sample fails, reducing the temperature change rate by the temperature change rate step length until no failure occurs after 5 cycles, and recording the temperature change rate m ℃/min at the moment; in this embodiment, the high temperature threshold range is Th-10～ThLow temperature threshold range of T1～T1+10, an initial temperature change rate of 60 ℃/min, and a temperature change rate step size of 10 ℃/min. Of course, in other embodiments, the high temperature threshold, the low temperature threshold, the initial temperature change rate, and the temperature change rate step may be set to be other values, which is not limited in this application.
The vibration stepping stress test comprises the following steps: setting an initial vibration magnitude and a vibration step length, wherein the vibration step length is the vibration magnitude increased by the sample each time; carrying out durable vibration by using the initial vibration magnitude, carrying out function detection after vibrating for a period of time, if the function is normal, continuously increasing the vibration step length of the initial vibration magnitude until the sample fails, and determining the vibration magnitude before the failure as the operable limit value V of the vibration magnitudem(ii) a In this embodiment, the initial vibration magnitude is 5Grms, and the vibration step is 5Grms or 10 Grms. Of course, in other embodiments, the initial vibration magnitude and the vibration step size may be set to be other, and the application does not limit this.
In order to detect whether the condition of invisible badness which cannot be detected due to high-magnitude damage exists in the test process, in the vibration stepping stress test, when the vibration magnitude reaches a fixed value or more, after each step of function detection is finished, the vibration magnitude is adjusted to the initial vibration magnitude, and then the function detection is carried out again, wherein the fixed value is a high-vibration magnitude damage value; wherein, in the present embodiment, the fixed value is 20 Grms.
The temperature and vibration comprehensive environmental stress test comprises the following steps: setting a low temperature threshold value, a high temperature threshold value, an initial vibration magnitude, a vibration threshold value, a vibration step length and a temperature change rate; circulating at a temperature change rate between a low-temperature threshold value and a high-temperature threshold value, increasing the initial vibration magnitude by a vibration step length, detecting the function after the sample vibrates for a period of time, and if the function is normal, continuously increasing the vibration step length of the initial vibration magnitude until the sample fails; wherein the vibration magnitude is less than or equal to the vibration threshold value. In this embodiment, the high temperature threshold range is Th-10～ThLow temperature threshold range of T1～T1+10, temperature change rate of m deg.C/min, initial vibration magnitude of 5Grms, and vibration limit range of Vm～Vm10Grms and the vibration step size is 5Grms or 10 Grms.
In order to detect whether high-magnitude damage exists but invisible badness which cannot be detected in the test process, in a temperature and vibration comprehensive environment stress test, when the vibration magnitude reaches a fixed value or more, after each step of function detection is finished, the vibration magnitude is adjusted to the initial vibration magnitude, and then function detection is carried out again, wherein the fixed value is a high-vibration magnitude damage value; wherein, in the present embodiment, the fixed value is 20 Grms.
The safety test stage is carried out temperature and vibration comprehensive environment stress test, and the safety test stage comprises the following steps: operational threshold value T at low temperaturel80% of the total amount of the components is a first low temperature value, and the components can be heated at a high temperatureOperating threshold value Th80% of the first high temperature value, operational limit value V at vibration levelmAnd 50% of the first vibration level value is the first vibration level value, the sample is subjected to function detection, if the function is normal, the effectiveness test is carried out, and if the sample fails, the temperature and the vibration level are reduced until the safety test is passed.
The effectiveness test comprises the following steps: and (3) making a fault on the sample which passes the safety test, carrying out effectiveness test on the sample with the fault, observing whether the fault can be detected, if so, relaxing the test condition, and if not, tightening the test condition, wherein the test condition comprises temperature and vibration magnitude.
HASS program establishment includes: and (3) carrying out 30 times of tests on the sample passing the effectiveness test under test conditions, carrying out function detection, wherein if the function is normal, the HASS program meets the test requirement, and if the function is abnormal, the number of cycles needs to be checked and modified. In actual tests, the number of cycles may be other, and the present application does not limit the number of cycles.
The sediment screening comprises the following steps: the samples were tested according to the established HASS program to determine defects in the sample production process and to make improvements.
The verification screening comprises: and (4) carrying out safety test, effectiveness test, HASS program establishment and precipitation screening on the sample which passes the precipitation screening again, determining the defects of the sample in the precipitation screening and solving the problems.
In any of the testing processes of step 202 and step 203, if a sample is found to be faulty, a fault analysis is performed and the fault is repaired, and if no sample is found to be faulty, the stage testing is continued until the whole HALT detection process and the whole HASS detection process are finished. The fault may be that the test device has a messy code, the safety alarm device 31 always displays alarm information, the electric heating device 33 does not heat, and the like.
In summary, the accelerated reliability test method provided in this embodiment can solve the problem of too long time consumed by the existing product reliability test in the product design and production stages by using the HALT and HASS test methods to detect the product in the product design and production stages, and improves the production efficiency of the product.
The present application provides a general method of HALT and HASS testing for future reference and more specification of HALT and HASS testing.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. An accelerated reliability testing method, the method comprising:
s1, carrying out initial detection on the sample, wherein the initial detection comprises detecting whether the performance index and the like of the sample are normal or not;
s2, carrying out HALT (high accelerated life test) on the sample qualified in the initial detection to obtain a low-temperature operable threshold, a high-temperature operable threshold and a vibration magnitude operable threshold, wherein the HALT comprises a low-temperature stepping stress test, a high-temperature stepping stress test, a rapid temperature change stress test, a vibration stepping stress test and a temperature and vibration comprehensive environment stress test;
s3, performing HASS on the sample according to the low-temperature operable threshold, the high-temperature operable threshold and the vibration magnitude operable threshold, wherein the HASS comprises a safety test, a validity test, a HASS program establishment, a precipitation screening and a verification screening;
in step S2 and step S3, if the sample is found to be faulty, a fault analysis is performed and the fault is repaired, and if the sample is not found to be faulty, the phase test is continued until the entire HALT detection process and the entire HASS detection process are completed.
2. The accelerated reliability test method according to claim 1, wherein in the step S2, the vibration step stress test includes:
setting an initial vibration magnitude and a vibration step length, wherein the vibration step length is the vibration magnitude of each increase of the sample;
and performing durable vibration by using the initial vibration magnitude, performing function detection after vibrating for a period of time, if the function is normal, continuously increasing the vibration step length of the initial vibration magnitude until the sample fails, and determining the vibration magnitude before the failure as the operable limit value of the vibration magnitude.
3. The accelerated reliability test method of claim 2, wherein, in the step S2, the temperature and vibration combined environmental stress test includes:
setting a low temperature limit value, a high temperature limit value, the initial vibration magnitude, a vibration limit value, the vibration step length and the temperature change rate;
circulating at the temperature change rate between the low temperature limit value and the high temperature limit value, increasing the initial vibration magnitude by the vibration step length, performing function detection after the sample vibrates for a period of time, and if the sample has a normal function, continuously increasing the initial vibration magnitude by the vibration step length until the sample fails;
wherein the vibration magnitude is less than or equal to the vibration threshold value.
4. The accelerated reliability test method according to claim 3, wherein when the vibration level reaches a fixed value or more, after each step of the function test is completed, the function test is performed again after the vibration level is adjusted to the initial vibration level, and the fixed value is a high vibration level destruction value.
5. The accelerated reliability testing method of claim 1, wherein the safety testing stage performs the temperature and vibration combined environmental stress test with 80% of the low temperature operational threshold as a first low temperature value, 80% of the high temperature operational threshold as a first high temperature value, and 50% of the vibration magnitude operational threshold as a first vibration magnitude value, and performs the function test on the sample, performs the validity test if the sample is in a normal function, and reduces the temperature and vibration magnitude until the safety test is passed if the sample fails.
6. The accelerated reliability test method of claim 1, wherein the validity test comprises: and (3) making a fault on the sample which passes the safety test, carrying out the effectiveness test on the sample with the fault, observing whether the fault can be detected, if so, relaxing the test condition, and if not, tightening the test condition, wherein the test condition comprises temperature and vibration magnitude.
7. The accelerated reliability test method of claim 1, wherein the HASS program establishment comprises: and (3) carrying out 30 times of tests on the sample passing the validity test under the test condition, carrying out function detection, wherein if the functions are normal, the HASS program meets the test requirements, and if the functions are abnormal, checking and modifying the cycle number.
8. The accelerated reliability test method of claim 1, wherein the precipitation screening comprises: and (4) testing the sample according to the established HASS program, determining defects in the sample production process and making improvements.
9. The accelerated reliability test method of claim 1, wherein the validation screen comprises: subjecting the sample that passes the precipitation screen again to the safety test, the validation test, the HASS procedure establishment, and the precipitation screen, determining the sample's deficiencies in the precipitation screen and solving the problem.
10. An accelerated reliability testing apparatus, comprising:
the electronic file management system EDM is used for recording the test conditions in the test process in real time;
the controller comprises an HC-3000 control system, and the HC-3000 control system is in communication connection with the EDM;
the test box comprises a safety alarm device, a pneumatic vibration device, an electric heating device and a liquid nitrogen cooling device, and is in communication connection with the controller;
the temperature sensor measures the temperatures of the electric heating device and the liquid nitrogen cooling device and is in communication connection with the HC-3000 control system;
a vibration sensor measuring a magnitude of vibration of the pneumatic vibration device and communicatively coupled to the HC-3000 control system.
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