CN103234725B - Method for testing vibration damage limit of anti-skidding braking control box - Google Patents
Method for testing vibration damage limit of anti-skidding braking control box Download PDFInfo
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- CN103234725B CN103234725B CN201310169895.7A CN201310169895A CN103234725B CN 103234725 B CN103234725 B CN 103234725B CN 201310169895 A CN201310169895 A CN 201310169895A CN 103234725 B CN103234725 B CN 103234725B
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Abstract
The invention discloses a method for testing the vibration damage limit of an anti-skidding braking control box. The method comprises the following steps of applying anti-skidding braking working current while applying vibration stepping stress; testing whether the performance of the anti-skidding braking control box is qualified or not; if the performance of the anti-skidding braking control box is unqualified, giving an improvement suggest of improving the vibration resistance of the control box; and if the performance of the anti-skidding braking control box is qualified, continuing testing till a required vibration damage limit is reached. Testing of the vibration damage limit of the control box by adopting vibration stepping test belongs to one of the contents of long acceleration service life test, and is used for making a high acceleration stress sieving test section. According to the method, the vibration damage limit of the anti-skidding braking control box is tested by adopting an electric vibration table, working current is applied in a testing process, the improvement suggest is provided and technical improvement is made according to tested vibration failure hidden danger, and vibration damage limit test data determined after improvement is used for making the high acceleration stress sieving test section.
Description
Technical field
The present invention relates to the electronics field of airplane in transportation category brake system, specifically a kind of method of testing adopting sine sweep and broadband to carry out antiskid braking control box vibration fault at random.
Background technology
Vibration step stress test is one of content of GMW8287 " high accelerated aging, highly accelerated stress screen and sampling observation " standard, the present invention applies vibration stepstress, the cyclic process of technological improvement is carried out, till when proceeding to unconditionally change or reached desired value again for vibration fault.
The flutter failure limit breaks down in vibration Step test process, the vibration value that after withdrawing vibration stress, the performance of control enclosure can not be recovered.The flutter failure limit of antiskid braking control box can be improved by technological improvement.
Vibration working limit breaks down in vibration Step test process, the vibration value that after withdrawing vibration stress, the performance of control enclosure can be recovered.The vibration working limit of antiskid braking control box can be improved by technological improvement.
Antiskid braking control box is the electronic product in Aircraft Anti-skid Break Control; be designed with the antiskid function in take-off line brake function, landing braking process, the several functions such as protection among wheels of ground protection function when landing, landing mission middle left and right undercarriage wheel, any one function does not meet designing requirement and is and breaks down.
Illustrate according to general international standard GMW8287, when determining flutter failure stress limit, applying vibration stepstress, not applying working current; The present invention, while applying vibration stepstress, selects the pulsating current applying antiskid braking control box antiskid brake function, excites and environmental stress, fault that working current is relevant.
In order to improve the reliability of electronic product, Highly Accelerated Life Test technology is adopted to excite the potential faults of control enclosure in the world, the test figure obtained in Highly Accelerated Life Test is adopted to formulate the highly accelerated stress screeningtest section of control enclosure, as checking and accepting the quality inspection foundation of dispatching from the factory, substitute the common screening technique in original MIL-STD-2164 standard.Highly accelerated stress screeningtest adopts special section, and a kind of product special test profile, special section carries out Highly Accelerated Life Test by the electronic product of same model and obtains.
The object of vibration Step test is the potential faults that excitation electron product is relevant with vibration, recommendation on improvement for vibration fault hidden danger is proposed and completing technology improvement, thus improve vibration working limit and the breaking limit of control enclosure, shorten a kind of experimental technique of development time.The vibration parameters of highly accelerated stress screen derives from the vibration working limit data obtained in vibration Step test, and for the final state of the art of iterate improvement.This test not only can substitute the screening of conventional 80h with the highly accelerated stress screen of 3h ~ 6h, and uses the experimental technique proving a raising Electronic products manufacturing quality and production efficiency.
The electronic product of the airlines such as external Boeing, just started in electronic product, promote vibration Step test technology as far back as the sixties in last century.
According to GMW8287 standard, the Step test of shaking of electronic product includes two parts content, and first iteration carries out vibrotechnique improvement, improves the vibration adaptation ability of control enclosure; It two is vibration parameters according to last technological improvement state determination highly accelerated stress screeningtest section.
External employing GMW8287 formulates the flutter failure marginal test of tested products, but never leaks as the top-secret technology of enterprise-level specific to the test method of the flutter failure limit of tested products; This standard is to the whether applying working stress not specified (NS) in vibration step stress test.
Vibrate step stress test in GMW8287 standard and adopt reliability enhancement testing equipment, reliability enhancement testing equipment has the mechanical vibrating system of Triaxiality and six degrees of freedom.
Present status in China:
By the impact of external advanced experimental technique, domestic about have more than 100 individual proprietorship or three money electronic enterprises using the enterprise requirements of stepping vibration stress test as electronic product development, for improving the flutter failure limit of electronic product, determine whether to carry out carrying out technological improvement for vibration fault hidden danger.But product does not carry out highly accelerated stress screeningtest to dispatching from the factory, reason is the domestic standard that there is no electronic product enforcement highly accelerated stress screen.
Beijing Institute of Aeronautics Research on Automobile's Reliability Engineering institute and Air China's industry 301 institute study and vibrate Step test technology and all have more than 10 year history, but due to the technical know-how of nearly 50 years abroad, demestic user and product development unit is made to lack understanding to this technology, government offices do not issue the standard of this technology of application yet, so in the development field of electronic product this technology untapped.
Because external long-term technology blocks, current domestic electronic product still adopts common screening technique, and reason is the domestic standard not yet putting into effect highly accelerated stress screen, and enterprise does not carry out the foundation of highly accelerated stress screeningtest.One of object of vibration Step test is exactly provide vibration stress value to the high shaker test section that accelerates.
The flutter failure marginal test of domestic and international electronic product is carried out all in a non-operative state, only apply vibration stepstress and the method that do not apply working current not exclusively conforms to using state, because in use product bears environmental stress and working stress simultaneously, adopting this classic method to test the data obtained has deficient true part.
Seldom introduce the national conditions of the reliability enhancement testing equipment of Triaxiality and six degrees of freedom vibrational system to adapt to state-owned enterprise, the present invention adopts electric vibration table to carry out vibration Step test.
Existing vibration Step test method is compared in table 1 with the technology of the present invention.
At application number be: in the innovation and creation of 201110310884.7, disclose a kind of method determining the airplane antiskid braking control box vibration working stress limit.The method has following technical characteristic:
A. adopt reliability enhancement testing equipment, steam hammer exciting has the characteristic of Triaxiality and six degrees of freedom, and excitation method difference makes testing program different, shows installation direction and the vibration parameters aspect of antiskid braking control box;
B. vibrational energy distribution is in the space of Triaxiality and six degrees of freedom, and is dispersed between 10Hz ~ 10000Hz, better to the vibration fault hidden danger effect of component-level and plate level.
But, determine disclosed in 201110310884.7 that the method for the airplane antiskid braking control box vibration working stress limit also has following deficiency:
A. the mechanical vibrating system energy consumption of reliability enhancement testing equipment is comparatively large, and compare with electric vibration table, the energy exciting identical fault need export about two times just can reach and excite out of order object;
B. reliability enhancement testing equipment can not carry out sine sweep, thus can not determine the resonance frequency of control enclosure.
C. the vibration table of reliability enhancement testing equipment knocks copper coin exciting by 9 ~ 24 pneumatic hammers, and amplitude is little;
D. reliability enhancement testing equipment knocks copper coin exciting owing to adopting pneumatic hammer, and noise is large;
E. reliability enhancement testing equipment is not so good as electric vibrating system to the fault stimulation effect of complete machine level.
Advantage due to electric vibration table can overcome the deficiency of reliability enhancement testing equipment, and the electric vibration table of state-owned enterprise is popularized, and is therefore necessary to study the technology adopting electric vibration table to carry out control enclosure vibration Step test.
Summary of the invention
For overcoming in prior art the scarce capacity exciting complete machine level vibration fault hidden danger, the present invention proposes a kind of method of antiskid braking control box flutter failure limit test.
Detailed process of the present invention comprises the following steps:
Step 1, determines vibration Step test parameter
The step-length of vibration value when described test parameters comprises on-test, vibration Step test, the retention time in each step-length, antiskid brake working current, applying mode and test exemplar quantity, and vibration test required value when vibration value reaches 18Grms.
Step 2, formulates vibration Step test section
According to step 1 and determine test on-test time vibration value, the step-length of vibration Step test, retention time in each step-length, antiskid brake working current and applying mode thereof, vibration value reach 18Grms time and later micro-vibration test required value, determine vibration Step test section.
In described vibration Step test section, vibration value is set to the vibration value during on-test determined, the output current of test antiskid braking control box, this antiskid braking control box output current should be 0mA ~ 20mA.According to the vibration step-length determined, the vibration value of shaking table is elevated to next test point, the output current of test antiskid braking control box, this antiskid braking control box output current should be 0mA ~ 20mA.At the vibration retention time t of each vibration level
ithe real time needed for Responding time+test antiskid braking control box output current of=antiskid braking control box, i=1 ~ n.At the retention time t of each micro-vibration level
jreal time needed for=test antiskid braking control box output current, j=1 ~ m.
Repeat the described vibration-test process raising this value of vibration value-keep, until the vibration value that shaking table is applied to antiskid braking control box reaches the determined flutter failure limit.
Step 3, is connected to antiskid braking control box on vibration table by vibration tong
On vibration tong, the hole of processing installation antiskid braking control box should be symmetrical between two parties, and install steel-wire screw-socket additional in hole.
Step 4, adopts sine sweep to determine the resonance frequency of this antiskid braking control box
Carry out sine sweep test according to HB5830.5 Fig. 3 E level, swept frequency scope is 10Hz ~ 2000Hz, and determine the frequency that resonance occurs, this resonant frequency point should be avoided in installation site aboard.In vibration sweep check process, the excited vibration value of applying is 6Grms.
Step 5, test vibration breaking limit
Antiskid braking control box vibration tong is fastened on the moving-coil of shaking table, connects vibration transducer, close test chamber door, by the computer for controlling of Fig. 1 test profile inputted vibration platform.
The process of test vibration breaking limit is:
The initial value of shaking table is adjusted to 4Grms, the duration of vibration is 25min, the performance test time comprising antiskid braking control box is about 15min, and the output current of first time test antiskid braking control box, the output current of described antiskid braking control box is 0mA ~ 20mA.
After first time, test terminated, according to the test profile formulated, proceed to vibrate Step test with the step-length of 2Grms, vibration value is set to 6Grms, vibration duration is 25min, the performance test time comprising antiskid braking control box is about 15min, and the output current of second time test antiskid braking control box, the output current of described antiskid braking control box is 0mA ~ 20mA.
After second time test terminates, according to the test profile formulated, proceed to vibrate Step test with the step-length of 2Grms, vibration value is set to 8Grms, vibration duration is 25min, the performance test time comprising antiskid braking control box is about 15min, and the output current of third time test antiskid braking control box, the output current of described antiskid braking control box is 0mA ~ 20mA.
Vibration Step test is carried out, until vibration value is increased to 18Grms by the step-length of 2Grms according to above-mentioned test method.
When vibrating value and being increased to 18Grms, this value continues 25min, the performance test time comprising antiskid braking control box is about 15min, the antiskid brake working current that antiskid braking control box exports after tested is 0mA ~ 20mA, then will vibrate value to fall after rise to 4Grms, under micro-condition of shaking, test the electric current of antiskid braking control box, the antiskid brake working current that antiskid braking control box exports after tested is 0mA ~ 20mA, micro-time 15min that shakes.
The vibration value of shaking table is continued to rise to 20Grms, this value continues 25min, the performance test time comprising antiskid braking control box is about 15min, the antiskid brake working current that antiskid braking control box exports after tested is 0mA ~ 20mA, then will vibrate value to fall after rise to 4Grms, under micro-condition of shaking, test the electric current of antiskid braking control box, the antiskid brake working current that antiskid braking control box exports after tested is 0mA ~ 20mA, micro-time 15min that shakes.
The vibration value of shaking table is continued to rise to 22Grms, this value continues 25min, the performance test time comprising antiskid braking control box is about 15min, the antiskid brake working current that antiskid braking control box exports after tested is 0mA ~ 20mA, then will vibrate value to fall after rise to 4Grms, under micro-condition of shaking, test the electric current of antiskid braking control box, working current is 10mA after tested, does not reach the requirement that maximum output current is 20mA;
Technological improvement is carried out to the antiskid braking control box losing brake function, makes it can export the antiskid brake working current of 0mA ~ 20mA under the vibration condition of 22Grms, meet antiskid brake functional requirement, make it meet follow-up test requirement.
When shaking table reaches 24Grms to the vibration value that antiskid braking control box applies, if the antiskid brake working current that described antiskid braking control box exports does not meet the requirement of 0mA ~ 20mA, then need to improve this antiskid braking control box, make it meet follow-up test requirement.
When shaking table is less than 24Grms to the vibration value that antiskid braking control box applies, if the antiskid brake working current that described antiskid braking control box exports does not meet the requirement of 0mA ~ 20mA, then need to improve this antiskid braking control box, make it meet follow-up test requirement.
Step 6, carries out verification experimental verification to the antiskid braking control box after improving
Make the vibration value of shaking table reach value when breaking down, this value continues 25min, and the performance test time comprising antiskid braking control box is about 15min, and the antiskid brake working current that test antiskid braking control box exports should be 0mA ~ 20mA; When the vibration value that stepping reaches reach or higher than 18Grms time, also vibration value should be fallen after rise to 4Grms when working current test passes, the electric current testing antiskid braking control box under micro-condition of shaking should be 0mA ~ 20mA, meets the requirement of follow-up vibration Step test;
According to the test profile formulated, continue to raise vibration value with the vibration step-length of 2Grms, raised value continues 25min, and the performance test time comprising antiskid braking control box is about 15min, and the antiskid brake working current that test antiskid braking control box exports should be 0mA ~ 20mA; When the vibration value that stepping reaches reach or higher than 18Grms time, when working current test passes also should will vibration value fall after rise to 4Grms, the electric current testing antiskid braking control box under micro-condition of shaking should be 0mA ~ 20mA;
Require to proceed to 24Grms according to above-mentioned vibration Step test, 24Grms is the flutter failure limit value determined before test, this value continues 25min, the performance test time comprising antiskid braking control box is about 15min, and the antiskid brake working current that test antiskid braking control box exports should be 0mA ~ 20mA; Also should fall after rise to 4Grms by vibration value when working current test passes, when the electric current testing antiskid braking control box under micro-condition of shaking is within the scope of 0mA ~ 20mA, off-test.
Describedly determine that vibration test starting point is 4Grms ~ 8Grms; The vibration step-length determined is 2Grms; The retention time determining every step-length vibration level is 25min, and the performance test time comprising antiskid braking control box is about 15min, and the antiskid brake working current that test antiskid braking control box exports should be 0mA ~ 20mA; At the end of each vibration level, carry out after determining to reach 18Grms that 4Grms is micro-to shake; Determine that the antiskid brake working current applied in process of the test is 0mA ~ 20mA; Determine that the value of sine sweep is 6Grms, swept frequency scope is 10Hz ~ 2000Hz.
Describedly determine that the flutter failure ultimate value of antiskid braking control box is 22Grms; The flutter failure ultimate value of improved antiskid braking control box is greater than 24Grms.
The value of described three kinds of antiskid braking control box sine sweeps is 6Grms, the frequency of sine sweep is: 10Hz ~ 2000Hz, test the resonance frequency obtained to be followed successively by: 150Hz ~ 160Hz, 160Hz ~ 170Hz, 150Hz ~ 160, test the resonance value obtained and be followed successively by: 18Grms, 19Grms, 19Grms.
The present invention applies antiskid brake working current while applying vibration stepstress, whether the performance of test antiskid braking control box is qualified, if defective, proposes recommendation on improvement, improves the vibration resistance ability of control enclosure, if qualified, continue test, until meet the requirements of the flutter failure limit.Adopt one of the broken circumpolar limit of vibration Step test testing and control box vibration content belonging to Highly Accelerated Life Test, for formulating highly accelerated stress screeningtest section.
The test parameters of the inventive method and implementation result are:
A. complete with time of 2 days and excite antiskid braking control box vibration fault hidden danger, propose recommendation on improvement and completing technology improves; Verify improvement effect to the control enclosure after improving, and proceed to vibrate Step test, until reach designing requirement, three actual anti-vibration abilities reached of embodiment are all greater than 24Grms;
B. in the process of flutter failure limit test, apply working current by step 5 simultaneously, make trystate consistent with using state, under vibration stress, working stress acting in conjunction, excite the potential faults of control enclosure, in working order, components and parts are in febrile state, easily excite and the hot relevant potential faults that shakes;
Invention achieves the designing requirement exciting and eliminate vibration fault hidden danger, the vibration resistance of this control enclosure is increased as being greater than 24Grms by the original 22Grms that is less than.When reliability index MTBF is 6000h, according to GJB1407, at least need 6000h × 5 times=30000h just can inspire the identical potential faults being sensitive to vibration.
The MTBF of control enclosure described in embodiment 1 requires as 6000h, adopt vibration stepping test method excite and improve be sensitive to vibration potential faults after, this year has carried out the reliability growth test of 30000h by GJB1407, high temperature, low temperature, temperature variation, vibration and work electric stress is applied in process of the test, do not break down in process of the test, prove that the innovative approach taked in the test of 2 days is effective, there is the green effect of saving test period 30000h, reducing energy resource consumption.
The MTBF of control enclosure described in embodiment 2 requires as 6200h, after adopting the improvement of vibration Step test method to be sensitive to the potential faults of vibration, the reliability growth test of 31000h has been carried out by GJB1407, high temperature, low temperature, temperature variation, vibration and work electric stress is applied in process of the test, do not break down in process of the test, prove that the innovative approach taked in the test of 2 days is effective, there is the green effect of saving test period 30000h, reducing energy resource consumption.
The MTBF of control enclosure described in embodiment 3 requires as 64000h, after adopting the improvement of vibration Step test method to be sensitive to the potential faults of vibration, this year has carried out the reliability growth test of 32000h by GJB1407, high temperature, low temperature, temperature variation, vibration and work electric stress is applied in process of the test, do not break down in process of the test, prove that the innovative approach taked in the test of 2 days is effective, there is the green effect of saving test period 30000h, reducing energy resource consumption.If do not carry out vibration Step test and corresponding design when improving before reliability growth test, according to fail-test experience in the past, when reliability index is greater than 6000h, at least need repeatedly improves twice in process of the test and just can reach designing requirement.Fail-test testing expenses hourly are 500 yuan, and the testing expenses of 30000 hours are 1,500 ten thousand yuan.In order to save time and resource, these three fail-tests adopt accelerated method to carry out, and the acceleration reliability test method of control enclosure is shown in 201110443565.3 patent specifications.
Owing to have employed technique scheme, the present invention has following characteristics:
A. adopting electric vibration table to carry out the flutter failure limit test of antiskid braking control box, in test process, apply working current, proposing recommendation on improvement and completing technology improvement according to testing the vibration fault hidden danger obtained;
B. using the flutter failure marginal test data determined after improving as the data formulating highly accelerated stress screeningtest section.
Existing vibration Step test method is compared in table 1 with the technology of the present invention.
Table 1 existing vibration Step test method and the technology of the present invention contrast table
Embodiment
The present invention's three embodiments adopt three kinds of control enclosurees on different transporter to carry out vibration Step test respectively, by testing and improving, can normally work under the vibration environment condition make control enclosure taking off, landing.And according to the vibration test parameter of state of the art determination highly accelerated stress screen section after improving.
Test exemplar in three embodiments is all randomly drawed in the product of current payment, and test exemplar is 1 cover.
The flutter failure limit test that three embodiments are carried out, the testing equipment of employing is the equipment of assay approval, and before the deadline, in table 2.
Table 2 testing equipment table
Embodiment 1
The present embodiment carries out flutter failure limit test to the antiskid braking control box of the first domestic secondary-line-aircraft brake system, by vibration Step test and technological improvement, improves the vibration adaptation ability of control enclosure.
The present embodiment comprises the following steps:
Step 1, determines vibration Step test parameter
Described vibration Step test parameter is suitable for electric vibration table.
The step-length of vibration value when described test parameters comprises on-test, vibration Step test, the retention time in each step-length, antiskid brake working current, applying mode and test exemplar quantity, and vibration test required value when vibration value reaches 18Grms.
Vibration value when determining on-test is 4Grms.Determine that the step-length applying vibration Step test is 2Grms.Determine that the retention time in each step-length is 25min, the performance test time comprising control enclosure is about 15min
Determine antiskid brake working current.The electric current exported due to antiskid braking control box is directly proportional to the pressure that brake valve exports, according to the maximum brake pressure determination antiskid brake working current that brake valve exports.
The brake pressure scope that brake valve exports is 0MPa ~ 20MPa, and antiskid brake working current is 0mA ~ 20mA.Applying mode is the working current of change, and the change frequency of this working current is 3 times/min; Nominal voltage is 28V, and in complete test profile, applies working current all the time.
When vibrating each vibration level when value reaches 18Grms and later, at the end of each vibration value, and then vibration values being down to 4Grms carrying out micro-shaking, the components and parts rosin joint potential faults inspired in high-magnitude vibration with Timeliness coverage; 4Grms micro-time of shaking is about 15min, is as the criterion to carry out a performance test duration.The flutter failure limit improves the technological improvement of control enclosure vibration resistance lower than completing during 24Grms, the flutter failure limit is higher than not carrying out the technological improvement improving control enclosure vibration resistance during 24Grms.
Test exemplar quantity is 1 cover.
Step 2, formulates vibration Step test section
The test parameters determined according to step 1 is formulated vibration Step test section and is seen Fig. 1.
Test profile horizontal ordinate above Fig. 1 is the time, and unit is min; Ordinate is vibration value, and unit is Grms, and vibration value terminates to 24Grms from 4Grms.
Be vibrational spectra below Fig. 1, horizontal ordinate is frequency, and unit is Hz; Ordinate is power spectrum density, and unit is g2/Hz.
According to the maximum brake pressure determination antiskid brake working current that brake valve exports.
In the present embodiment, the brake pressure scope that brake valve exports is 0MPa ~ 20MPa, and the working current controlling antiskid brake pressure is 0mA ~ 20mA.When the electric current that antiskid braking control box exports is 20mA, brake valve is made to export maximum brake pressure 20MPa; When the electric current that antiskid braking control box exports is 0mA, the brake pressure that brake valve exports is 0MPa.It is 0mA ~ 20mA that antiskid braking control box exports antiskid brake electric current, and frequency of operation is 3 times/min; Nominal voltage is 28V; See Fig. 1.
Determine the vibration retention time t at each vibration level
ithe real time needed for Responding time+test antiskid braking control box output current of=antiskid braking control box, i=1 ~ n.
Determine the retention time t at each micro-vibration level
jreal time needed for=test antiskid braking control box output current, j=1 ~ m.
Determine the duration applying working stress, refer in complete test profile, apply working current.
Step 3, installs antiskid braking control box
By test antiskid braking control box on vibration table.During installation, bore four holes according to antiskid braking control box installation site aboard on fixture, bore position is symmetrical, to reduce the error in process of the test; Then in each hole, steel-wire screw-socket is installed, steel-wire screw-socket is Steel material, the internal thread of steel-wire screw-socket is according to the mounting screw dimensioned of antiskid braking control box, antiskid braking control box is fixed on fixture, the object of installing steel-wire screw-socket is to ensure that antiskid braking control box does not loosen in flutter failure marginal test process, ensures that vibration value is unattenuated;
By vibration tong bolted on the moving-coil of shaking table; Then antiskid braking control box is arranged on fixture;
Be connected to by cable on the socket of antiskid braking control box, the other end of cable is connected with the test fixture of antiskid braking control box;
A sensor is pasted at each angle, the corner of antiskid braking control box upper cover, pastes 4 sensors altogether, for test vibration value;
Step 4, determines the resonance frequency of antiskid braking control box
According to HB5830.5 Fig. 3 E level, adopt the resonance frequency of sine sweep determination antiskid braking control box.Swept frequency scope is 10Hz ~ 2000Hz, and determine the frequency that resonance occurs, occur resonance when frequency sweep proceeds to 150Hz ~ 160Hz, resonance amplitude reaches 18Grms, and this resonant frequency point should be avoided in installation site aboard.In vibration sweep check process, the excited vibration value of applying is 6Grms.
Step 5, test vibration breaking limit
By the present embodiment step 3, antiskid braking control box vibration tong is fastened on the moving-coil of shaking table, connects vibration transducer, close test chamber door.
The process of test vibration breaking limit is:
The initial value of shaking table is adjusted to 4Grms, the duration of vibration is 25min, the performance test time comprising antiskid braking control box is about 15min, and the output current of first time test antiskid braking control box, the output current of described antiskid braking control box is 0mA ~ 20mA.
After first time, test terminated, according to the test profile formulated, proceed to vibrate Step test with the step-length of 2Grms, vibration value is set to 6Grms, vibration duration is 25min, the performance test time comprising antiskid braking control box is about 15min, and the output current of second time test antiskid braking control box, the output current of described antiskid braking control box is 0mA ~ 20mA.
After second time test terminates, according to the test profile formulated, proceed to vibrate Step test with the step-length of 2Grms, vibration value is set to 8Grms, vibration duration is 25min, the performance test time comprising antiskid braking control box is about 15min, and the output current of third time test antiskid braking control box, the output current of described antiskid braking control box is 0mA ~ 20mA.
Vibration Step test is carried out, until vibration value is increased to 18Grms by the step-length of 2Grms according to above-mentioned test method.
When vibrating value and being increased to 18Grms, this value continues 25min, the performance test time comprising antiskid braking control box is about 15min, the antiskid brake working current that antiskid braking control box exports after tested is 0mA ~ 20mA, then will vibrate value to fall after rise to 4Grms, under micro-condition of shaking, test the electric current of antiskid braking control box, the antiskid brake working current that antiskid braking control box exports after tested is 0mA ~ 20mA, micro-time 15min that shakes.
The vibration value of shaking table is continued to rise to 20Grms, this value continues 25min, the performance test time comprising antiskid braking control box is about 15min, the antiskid brake working current that antiskid braking control box exports after tested is 0mA ~ 20mA, then will vibrate value to fall after rise to 4Grms, under micro-condition of shaking, test the electric current of antiskid braking control box, the antiskid brake working current that antiskid braking control box exports after tested is 0mA ~ 20mA, micro-time 15min that shakes.
The vibration value of shaking table is continued to rise to 22Grms, this value continues 25min, the performance test time comprising antiskid braking control box is about 15min, the antiskid brake working current that antiskid braking control box exports after tested is 0mA ~ 20mA, then will vibrate value to fall after rise to 4Grms, under micro-condition of shaking, test the electric current of antiskid braking control box, working current is 10mA after tested, does not reach the requirement that maximum output current is 20mA;
Technological improvement is carried out to the antiskid braking control box losing brake function, makes it can export the antiskid brake working current of 0mA ~ 20mA under the vibration condition of 22Grms, meet antiskid brake functional requirement, make it meet follow-up test requirement.
In the present embodiment, when shaking table reaches 24Grms to the vibration value that antiskid braking control box applies, if the antiskid brake working current that described antiskid braking control box exports does not meet the requirement of 0mA ~ 20mA, then need to improve this antiskid braking control box, make it meet follow-up test requirement.
When shaking table is less than 24Grms to the vibration value that antiskid braking control box applies, if the antiskid brake working current that described antiskid braking control box exports does not meet the requirement of 0mA ~ 20mA, then need to improve this antiskid braking control box, make it meet follow-up test requirement.
Step 6, carries out verification experimental verification to the antiskid braking control box after improving
The vibration value of shaking table is made to reach value when breaking down, in the present embodiment, the vibration value improved when antiskid braking control box breaks down be 22Grms, therefore the vibration value of shaking table is adjusted to 22Grms, this value continues 25min, the performance test time comprising antiskid braking control box is about 15min, the antiskid brake working current that antiskid braking control box exports after tested is 0mA ~ 20mA, then will vibrate value to fall after rise to 4Grms, the electric current of antiskid braking control box is tested under micro-condition of shaking, the antiskid brake working current that antiskid braking control box exports after tested is 0mA ~ 20mA,
According to the test profile formulated, continue to raise vibration value with the vibration step-length of 2Grms, the vibration value raised is 24Grms, this value continues 25min, the performance test time comprising antiskid braking control box is about 15min, the antiskid brake working current that antiskid braking control box exports after tested is 0mA ~ 20mA, then will vibrate value to fall after rise to 4Grms, under micro-condition of shaking, test the electric current of antiskid braking control box, the antiskid brake working current that antiskid braking control box exports after tested is 0mA ~ 20mA; 24Grms is the flutter failure limit value determined before test, the off-test when the flutter failure limit is greater than this value.
In the present embodiment, continue to test the test figure obtaining this antiskid braking control box flutter failure limit and be greater than 24Grms, provide VIBRATION DESIGN foundation to design antiskid braking control box, and test to the synthetic chemistry laboratory of antiskid braking control box, highly accelerated stress screeningtest provides flutter test data.Main test data gathers in table 3.
The invention allows for embodiment 2 and embodiment 3.
Described embodiment 2 and embodiment 3 are the flutter failure marginal test of aircraft brake antiskid braking control box respectively, and the testing equipment adopted is identical with the testing equipment used in embodiment 1.
The process of embodiment 2 and embodiment 3 include determine to vibrate Step test parameter, formulate vibration Step test section, control enclosure is connected on vibration table by vibration tong, adopt sine sweep determine this antiskid braking control box resonance frequency, test vibration breaking limit, each step of verification experimental verification is carried out to the antiskid braking control box after improving, its detailed process is identical with the process of embodiment 1, difference is that embodiment 2 is different from the test data of embodiment 1 with the test data in embodiment 3, is specifically shown in Table 3.
Table 3 sine sweep and broad-band random vibration test antiskid braking control box potential faults test parameters summary sheet
The various embodiments described above carry out vibration Step test to the antiskid braking control box of three kinds of transporter brake system, tests the flutter failure limit of antiskid braking control box in process of the test.Test objective is the vibration fault hidden danger exciting this antiskid braking control box, and according to the vibration fault hidden danger determined, recommendation on improvement is proposed, thus reach the object completing excited vibrational potential faults and proposition technological improvement suggestion in about 2 days, improve the vibration adaptation ability of antiskid braking control box, and according to the vibration test parameter of the state of the art determination highly accelerated stress screen section after improving.
Test exemplar in the various embodiments described above is all randomly drawed in the product of current payment, can represent the quality level of current delivered product.Break down in process of the test and should carry out technological improvement and reparation, after improving and repairing, continue test.
Accompanying drawing explanation
Fig. 1 is the vibration Step test section of the embodiment of the present invention 1;
Fig. 2 is the vibration Step test section of the embodiment of the present invention 2;
Fig. 3 is the vibration Step test section of the embodiment of the present invention 3;
Fig. 4 is the process flow diagram that the present invention carries out vibrating Step test.
Claims (3)
1. a method for antiskid braking control box flutter failure limit test, is characterized in that, concrete steps are:
Step 1, determines vibration Step test parameter
Described vibration Step test parameter is the vibration Step test parameter based on electric vibration table;
The applying mode of the step-length of vibration value when described test parameters comprises on-test, vibration Step test, the retention time in each step-length, antiskid brake working current, working current and test exemplar quantity, and vibration test required value when vibration value reaches 18Grms;
Step 2, formulates vibration Step test section
When the step-length of the vibration value during on-test determined according to step 1, vibration Step test, the retention time in each step-length, antiskid brake working current and applying mode thereof, vibration value reach 18Grms and later micro-vibration test required value, determine vibration Step test section;
In described vibration Step test section, vibration value is set to the vibration value during on-test determined, the output current of test antiskid braking control box, this antiskid braking control box output current should be 0mA ~ 20mA; According to the vibration step-length determined, the vibration value of shaking table is elevated to next test point, the output current of test antiskid braking control box, this antiskid braking control box output current should be 0mA ~ 20mA; At the vibration retention time t of each vibration level
ithe real time needed for Responding time+test antiskid braking control box output current of=antiskid braking control box, i=1 ~ n; At the retention time t of each micro-vibration level
jreal time needed for=test antiskid braking control box output current, j=1 ~ m;
Repeat the described vibration-test process raising this value of vibration value-keep, until the vibration value that shaking table is applied to antiskid braking control box reaches flutter failure limit value;
Step 3, is connected on vibration table by antiskid braking control box by vibration tong;
Step 4, adopts sine sweep to determine the resonance frequency of this antiskid braking control box
Carry out sine sweep test according to HB5830.5 Fig. 3 E level, swept frequency scope is 10Hz ~ 2000Hz, and determine the frequency that resonance occurs, this resonant frequency point should be avoided in installation site aboard; In vibration sweep check process, the excited vibration value of applying is 6Grms;
Step 5, test vibration breaking limit value
Antiskid braking control box vibration tong is fastened on the moving-coil of shaking table, connects vibration transducer;
The process of test vibration breaking limit value is:
The initial value of shaking table is adjusted to 4Grms, and the duration of vibration is 25min, comprises 15min for testing the time of the performance of antiskid braking control box in the duration of described vibration; The output current of first time test antiskid braking control box, the output current of described antiskid braking control box is 0mA ~ 20mA;
After first time, test terminated, according to the test profile formulated, proceed to vibrate Step test with the step-length of 2Grms, vibration value is set to 6Grms, vibration duration is 25min, comprises 15min for testing the time of the performance of antiskid braking control box in the duration of described vibration; The output current of second time test antiskid braking control box, the output current of described antiskid braking control box is 0mA ~ 20mA;
After second time test terminates, according to the test profile formulated, proceed to vibrate Step test with the step-length of 2Grms, vibration value is set to 8Grms, vibration duration is 25min, comprises 15min for testing the time of the performance of antiskid braking control box in the duration of described vibration; The output current of third time test antiskid braking control box, the output current of described antiskid braking control box is 0mA ~ 20mA;
Vibration Step test is carried out, until vibration value is increased to 18Grms by the step-length of 2Grms according to above-mentioned test method;
When vibrating value and being increased to 18Grms, this value continuing 25min, comprising 15min in the duration of described vibration for testing the time of the performance of antiskid braking control box; The antiskid brake working current that antiskid braking control box exports after tested is 0mA ~ 20mA, then will vibrate value to fall after rise to 4Grms, the electric current of antiskid braking control box is tested under micro-condition of shaking, the antiskid brake working current that antiskid braking control box exports after tested is 0mA ~ 20mA, micro-time 15min that shakes;
Continue the vibration value of shaking table to rise to 20Grms, this value continuing 25min, comprising 15min in the duration of described vibration for testing the time of the performance of antiskid braking control box; The antiskid brake working current that antiskid braking control box exports after tested is 0mA ~ 20mA, then will vibrate value to fall after rise to 4Grms, the electric current of antiskid braking control box is tested under micro-condition of shaking, the antiskid brake working current that antiskid braking control box exports after tested is 0mA ~ 20mA, micro-time 15min that shakes;
Continue the vibration value of shaking table to rise to 22Grms, this value continuing 25min, comprising 15min in the duration of described vibration for testing the time of the performance of antiskid braking control box; The antiskid brake working current that antiskid braking control box exports after tested is 0mA ~ 20mA, then will vibrate value to fall after rise to 4Grms, under micro-condition of shaking, test the electric current of antiskid braking control box, working current is 10mA after tested, does not reach the requirement that maximum output current is 20mA;
Technological improvement is carried out to the antiskid braking control box losing brake function, makes it can export the antiskid brake working current of 0mA ~ 20mA under the vibration condition of 22Grms, meet antiskid brake functional requirement, make it meet follow-up test requirement;
When shaking table reaches 24Grms to the vibration value that antiskid braking control box applies, if the antiskid brake working current that described antiskid braking control box exports does not meet the requirement of 0mA ~ 20mA, then need to improve this antiskid braking control box, make it meet follow-up test requirement;
When shaking table is less than 24Grms to the vibration value that antiskid braking control box applies, if the antiskid brake working current that described antiskid braking control box exports does not meet the requirement of 0mA ~ 20mA, then need to improve this antiskid braking control box, make it meet follow-up test requirement;
Step 6, carries out verification experimental verification to the antiskid braking control box after improving
Make the vibration value of shaking table reach value when breaking down, this value continuing 25min, comprising 15min in the duration of described vibration for testing the time of the performance of antiskid braking control box; The antiskid brake working current that test antiskid braking control box exports should be 0mA ~ 20mA; When the vibration value that stepping reaches reach or higher than 18Grms time, also vibration value should be fallen after rise to 4Grms when working current test passes, the electric current testing antiskid braking control box under micro-condition of shaking should be 0mA ~ 20mA, meets the requirement of follow-up vibration Step test;
According to the test profile formulated, continue to raise vibration value with the vibration step-length of 2Grms, raised value continuing 25min, comprising 15min in the duration of described vibration for testing the time of the performance of antiskid braking control box; The antiskid brake working current that test antiskid braking control box exports should be 0mA ~ 20mA; When the vibration value that stepping reaches reach or higher than 18Grms time, when working current test passes also should will vibration value fall after rise to 4Grms, the electric current testing antiskid braking control box under micro-condition of shaking should be 0mA ~ 20mA;
Require to proceed to 24Grms according to above-mentioned vibration Step test, 24Grms is the flutter failure limit value determined before test, this value continuing 25min, comprising 15min for testing the time of the performance of antiskid braking control box in the duration of described vibration; The antiskid brake working current that test antiskid braking control box exports should be 0mA ~ 20mA; Also should fall after rise to 4Grms by vibration value when working current test passes, when the electric current testing antiskid braking control box under micro-condition of shaking is within the scope of 0mA ~ 20mA, off-test.
2. the method for testing of a kind of antiskid braking control box flutter failure limit as claimed in claim 1, is characterized in that, determine that vibration test starting point is 4Grms ~ 8Grms; The vibration step-length determined is 2Grms; Determining that the retention time of every step-length vibration level is 25min, comprising 15min in the duration of described vibration for testing the time of the performance of antiskid braking control box; The antiskid brake working current that test antiskid braking control box exports should be 0mA ~ 20mA; At the end of each vibration level, carry out after determining to reach 18Grms that 4Grms is micro-to shake; Determine that the antiskid brake working current applied in process of the test is 0mA ~ 20mA; Determine that the value of sine sweep is 6Grms, swept frequency scope is 10Hz ~ 2000Hz.
3. the method for testing of a kind of antiskid braking control box flutter failure limit as claimed in claim 1, it is characterized in that, the value of three kinds of antiskid braking control box sine sweeps is 6Grms, the frequency of sine sweep is: 10Hz ~ 2000Hz, test the resonance frequency obtained to be followed successively by: 150Hz ~ 160Hz, 160Hz ~ 170Hz, 150Hz ~ 160, test the resonance value obtained and be followed successively by: 18Grms, 19Grms, 19Grms.
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| CN103512716B (en) * | 2013-09-12 | 2016-06-01 | 西安航空制动科技有限公司 | A kind of method of antiskid braking control box highly accelerated stress screen |
| CN104049630B (en) * | 2014-06-10 | 2016-11-23 | 西安航空制动科技有限公司 | The method testing airplane antiskid braking control box fault under Thermal cycling conditions |
| CN106483407B (en) * | 2016-10-08 | 2019-03-19 | 西安航空制动科技有限公司 | The method for determining antiskid brake control device vibration weak link |
| CN107310750B (en) * | 2017-06-26 | 2019-05-31 | 西安航空制动科技有限公司 | A kind of vibration testing method of airplane brake system |
| CN107226218B (en) * | 2017-08-15 | 2019-05-10 | 西安航空制动科技有限公司 | The test method of airplane brake system combined stress |
| CN108318198B (en) * | 2017-12-20 | 2020-04-07 | 西安航空制动科技有限公司 | Verification method for determining thrust of vibration table of civil aircraft brake system |
| CN110736595B (en) * | 2018-07-18 | 2021-08-17 | 中车株洲电力机车研究所有限公司 | Method for evaluating service life of electronic equipment in rail transit cabin |
| CN109944648B (en) * | 2019-04-03 | 2021-06-25 | 中国船舶重工集团公司第七一九研究所 | Method and device for controlling fluid excitation vibration in lubricating oil pipeline |
| CN111413953A (en) * | 2020-04-10 | 2020-07-14 | 西安航空制动科技有限公司 | Method for determining vibration test parameters of brake control device |
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