344 results about "Testing reliability" patented technology

The invention discloses a multi-ring-arranged double-integrated circuit (IC) chip packaging piece and a production method thereof. The multi-ring-arranged double-IC chip packaging piece comprises a multi-ring quad flat no (QFN) lead frame with a carrier, an internal pin, IC chips and a plastic package body. The production method comprises the following steps of: thinning; scribing; adding the chips primarily; performing pressure welding; inversely adding the chips secondarily; filling the bottom and solidifying; performing plastic packaging and post solidifying; printing; separating pins; electroplating; separating products; testing the products; packing; and warehousing. Compared with a single-row lead frame with the same area as the multi-ring QFN lead frame, the multi-ring QFN lead frame increases the pins by over 40 percent, so that the requirements of high density and multiple input/output (I/O) packages are met; the chips are inversely added, so that the packaging piece has a small number of short welding lines, a short heat conduction distance and high radiation capacity; through the inverse addition of the chips, the capacitance and the inductance between protruding points and the pins are far lower than those of the welding lines between a chip welding disc and the pins, so that the influence on high frequency application is reduced; and the thickness of a QFN can be reduced to be below 0.5mm, so that the intersection and the open circuit of the welding lines are avoided and testing qualified rate and testing reliability are improved.

The invention discloses a system and a method for testing the reliability of an electric spindle in a machining center. The method comprises the following steps of: 1, establishing the system for testing the reliability of the electric spindle in the machining center; 2, determining test environment and test time; 3, performing a function test on the electric spindle to remove early failures; 4, acquiring the performance parameter of the electric spindle in a stable state and determining a failure criterion; and 5, circularly machining a typical workpiece, monitoring the state and performance parameter of the electric spindle and judging the failures. The system comprises a temperature sensor, a noise sensor, a force sensor, an eddy current displacement sensor, a vibration sensor, and a control unit connected with the parts. The system has the advantages of simple and compact structure, low cost, simple principle, convenience of operation, high test accuracy and the like.

The invention relates to a wet-clutch friction plate's wear extent testing method and a testing stand. The testing stand comprises a control mechanism, a power mechanism, a measured object and data acquisition mechanism, a brake mechanism and a hydraulic booster system. The measured object and data acquisition mechanism transmits acquired measured object status data, power mechanism status data and hydraulic booster system data to the control mechanism and the brake mechanism, and the control mechanism controls operations of the power mechanism and the hydraulic booster system. The testing method based on the testing stand comprises steps of testing static friction torque and static friction coefficient of friction plates, testing dynamic friction torque and dynamic friction coefficient of the friction plates and testing wear extent of the wet-clutch friction plates. According to the invention, wear extent and lifetime of wet-clutch friction plates can be tested, test results are accurate and measurement is convenient. Friction damage of clutch friction parts due to many times of combinations is prevented, and clutch testing reliability is guaranteed.

The invention discloses a dynamometer and hydraulic mixed loading table for testing the reliability of a power servo knife rest. The table comprises a power servo knife rest supporting part, a cutting force loading part and a power head loading part, wherein a power servo knife rest cushion plate (3) in the power servo knife rest supporting part is fixedly connected with a top plate of a power servo knife rest base (2); the power servo knife rest base (2) is fixed on the lower left part of horizon iron; the cutting force loading part comprises an analog knife rod (5), a cutting force loading supporting device and a cutting force loading device; the cutting force loading supporting device is fixed on the horizon iron on the upper right part of the power servo knife rest base (2); the cutting force loading device is fixed on the cutting force loading supporting device; the analog knife rod (5) is arranged on a knife disc; and the power head loading part arranged on the right side of the power servo knife rest supporting part comprises a bearing loading device (22), a bearing loading device base (23), a No.2 loading rod (21) and a dynamometer (25).

The invention belongs to the technical field of non-destructive testing and relates to an ultrasonic testing method used for composite material foaming structures. According to the method, ultrasonic waves formed by a large number of shock pulse waves in the composite material foaming structures are utilized, and by constructing transfer functions of the ultrasonic waves in the composite material foaming structures, the arithmetical relationship between the ultrasonic waves and different part defects of the composite material foaming structures is set up to carry out defect discriminating and ultrasonic testing; the shock pulse ultrasonic waves of different types, intensities and frequencies and ultrasonic testing achieving methods can be selected, and the different composite foaming structures can be tested in an ultrasonic mode. Actual testing results show that the sensitivity, the resolution and the ability of composite material foaming structure testing are remarkably improved, the defects and the combination conditions of skin, skin/foam cementing areas, foam/foam cementing areas and foam areas can be tested accurately, the testing reliability is greatly improved, and the foam testing thickness can be 100 mm.

The invention provides a testing structure for conducting reliability analysis to an inner dielectric of an integrated circuit, wherein, a metal wire adopted in the testing structure is in a straight line rod shape. The metal wire can be a plurality of metal lines which are in the straight line rod shape and connected with a dilated gasket respectively. The structure can completely avoid the situation that the test can not be carried out normally due to the easiness of burning down of the corners of the metal line when the voltage increases during the testing procedure. The structure can significantly reduce the possibility that the metal wire is burned down firstly in testing, thus facilitating the smooth implementation of the test and guaranteeing the accuracy of the test.

The invention discloses a system and a method for testing reliability of a mass storage system. The system comprises a data acquisition unit and a data analysis unit, wherein the data acquisition unit comprises a static test module, a 72-hour reliability test module, a recovery time test module, a bit error rate (BER) test module and a mean time between failures (MTBF) reference data acquisition module; the data analysis unit comprises a static test assessment module, a 72-hour reliability test result analysis module, a Markov analysis module, a Monte Carlo analysis module and a mean time to data loss (MTTDL) analysis module; and various performance indexes for reflecting a tested system are acquired by performing data acquisition and data analysis, performing comprehensive test on the aspects of static test, 72-hour reliability test, fault injection-based reliability test and the like and performing analysis by adopting the Markov module, the Monte Carlo module and a disk array MTTDL, so the technical problem that the reliability evaluation system in the prior art cannot comprehensively reflect the reliability of the mass storage system. The system and the method are particularly suitable for reliability test of the mass storage system.

The invention relates to a method and a system for testing the reliability of a load switch, and is characterized in that the method comprises the following steps that (1) a test system is connected with the load switch to be tested; (2) the load switch to be tested and the system are connected; (3) a pulse power module is set; (4) a subsystem sends out a pulse excitation signal; and (5) an alarm ending signal is sent out. The system comprises a control subsystem, an actual load subsystem and a temperature and humidity subsystem. According to the scheme provided by the invention, the reliability of a single-phase load switch and a three-phase load switch can be tested; the time and contact resistance are tested automatically, and stopping conditions are judged automatically; an alarm function is realized and the safety is high; mechanical reliability and electric reliability tests can be carried out automatically without manual operation, and the stability is good; and the wiring is simple and the verification time is saved.

The invention relates to a device and a method for testing fabric contact coldness, and belongs to the field of textile engineering. The testing device consists of an outer cover, a test board, a sink, a fabric splint, a fabric surface temperature sensor and the like. The testing device of the invention has the advantages of reasonable structure, convenient use, small volume, low manufacturing cost and large-scale industrialized production; and the testing device adopts a platinum resistor with good stability and high precision as the temperature sensor, so the testing precision is improved. A cover hood made of an insulating material is arranged above a test platform so as to reduce the influence of the ambient environment on the test, reduce the heat loss caused by heat radiation of the fabric and improve the testing reliability. The testing device and the testing method of the invention overcome the defects of high technical requirement and high testing cost when testing the maximum transient heat flow Qmax of the fabric by the conventional method to evaluate the coldness of the fabric. The device and the method of the invention for testing the fabric contact coldness can be used in the field of contact coldness evaluation for the fabric.

The invention discloses a grain cleaning loss detection method for a combined harvester and a device thereof. An array type piezoeletric quartz sensor is installed at the outlet of a cleaning sieve, the signal output from the array type piezoeletric quartz sensor is transmitted into a charge amplifier and a gain adjustable circuit to be processed and converted into a voltage signal with a certain amplitude value; a high pass filtering circuit and a sensitivity regulating circuit are used to respectively separate out the features of the vibration noise and the grain signals from the frequency domain and the time domain; the separated vibration noise and grain signals are rectified into standard pulse signals which can be executed by a micro monolithic processor through a pulse shaping circuit; the grain cleaning loss is detected by the method of full-width distribution of multi-lamella piezoelectric detection array, information is acquired from multiple areas and multiple angles, thereby enhancing the grain impact signals, improving the grain-grass identification precision and improving the testing reliability of the system; the detecting device has the advantages of good integral dynamic performance, strong anti-jamming capability, and high measurement precision, thereby realizing online measurement of the cleaning loss in the field.

The invention discloses a method for testing reliability of nonvolatile memories, which comprises the following steps: respectively selecting N blocks from each of K nonvolatile memories respectively provided with Nm blocks; respectively executing a test program for T times on the selected K*N blocks to acquire test data; according to the test data, counting a data relation between the frequency for executing the test program and the number of blocks accumulatively failing in tests in the frequency, and drawing a test curve; determining an equivalent failed block number judging standard; reading a failure number corresponding to an executing frequency value in the test curve; and comparing the obtained failure number with the equivalent failed block number judging standard, judging whether the nonvolatile memories are qualified. The invention also provides a device for testing the reliability of the nonvolatile memories. The test method and the test device have the advantages of reducing test time and improving test efficiency under the condition of not losing statistical significance.

The invention discloses a device for testing the reliability of a chain-type tool magazine and a manipulator. The device comprises a base, the chain-type tool magazine, a tool, a hydraulic driving mechanism, the manipulator, a main shaft, a fixed frame, a test bed, a first displacement sensor, a triaxial acceleration sensor, a uniaxial acceleration sensor, a photoelectric proximity switch, a second displacement sensor, a first supporting frame, a second supporting frame and a third supporting frame, wherein the base is fixed on the ground; the chain-type tool magazine is fixedly arranged on the base; the tool is arranged at a tool position of the chain-type tool magazine, and is rotated by the chain-type tool magazine to reach a tool change position; the hydraulic driving mechanism is fixedly connected with the chain-type tool magazine; and the manipulator is arranged on the output shaft of the hydraulic driving mechanism, and is driven by the hydraulic driving mechanism to rotate, transversely translate and longitudinally translate so as to realize actions of tool catching, tool extraction, tool change and tool assemble. The device can test the reliability of the chain-type tool magazine and the manipulator, and has the advantages of convenience in operation and high practicability.

The invention discloses a recording and playback test method and a related device. The method includes the steps of determining a target control matched with triggered control on operation interface during recording from operation interface during playback based on semantic information of control on operation interface of tested software during recording and playback; during recording, correspondingly applying the operation applied to triggered control to target control during playback, so that playback of operation corresponding to operation interface during recording is realized; and recording each operation in the obtained operation sequence, determining the target control one by one according to the execution sequence of each operation in the operation sequence, and executing the corresponding operation, so that the playback of the whole operation sequence can be completed, and finally, the test result of the tested software is determined. According to the method, the control is matched according to the semantic information of the control, operation playback is carried out depending on the coordinate position on the operation screenshot, the playback failure probability is effectively reduced, and the test reliability is improved. And furthermore, a more accurate test result of the tested software can be obtained.

A parallel test board preferably includes a plurality of serial slots connected to a motherboard and a number of parallel slots connected to the motherboard in parallel with each other. The motherboard provides an actual operational environment for devices under test (DUTs). DUTs are mounted in the slots. Using a plurality of serial slots, distorted timings due to one serial slot (e.g., an extension slot) have an influence on the other serial slot (e.g., a reference slot), as well as on the parallel slots. In this manner, a timing margin failure occurring during a multi-bank operation can be effectively detected. The slots to which the DUTs are mounted preferably have a socket structure with a support block having contact pins arranged thereon. Each of the contact pins preferably has a module contact part configured to contact a tab of the DUT and a board contact part configured to contact conductive wiring patterns of an intermediation board. An elastic member is also preferably interposed between the support block and each of the module and the board contact parts. According to various aspects and embodiments of this invention, testing reliability is improved and the durability of the test board is significantly increased.

The invention relates to a relay protection test method and a system based on the IEC61850 digital tester and belongs to electric energy test technical field. The test business is added in the test case script, one business is corresponding to one node of the test case script, the user can edit the test content in the test case script and set the end condition, the tester can execute the test process while the user transmits the command for starting the test for the edited automatic test case. The test process and the test method are improved via the quantity loaded curing principle, numerous experiments have proved that the automatic test method can effectively save the work time for the test person and raise the test reliability and efficiency.

The invention provides an automatic test system and method for a transformer substation measurement and control device. The system comprises a test background server, an exchanger, a network tester, an intelligent tester, a three-phase standard meter, a controllable power source and a GPS clock module. The data exchanging is respectively carried out between the network tester and the test background server, between the intelligent tester and the test background server, between the three-phase standard meter and the test background server and between the controllable power source and the test background server through the exchanger, the test background server is in communication with the measurement and control device through the network protocol, the controllable power source is controlled to supply electricity to the measurement and control device, and time synchronism between the test background server and the measurement and control device is achieved through a GPS clock module. According to the automatic test system and method for the transformer substation measurement and control device, a test task can be automatically generated, detection steps can be automatically executed, detection reports can be automatically generated, the interference of artificial factors is reduced, the test randomness is removed, testing efficiency and testing reliability are improved, testing repeatability is achieved, the traceability of testing work is guaranteed, and the reliability and consistency of the test result are guaranteed.

The invention discloses a gear dynamic stress test device, comprising a motor, speed increasing gear, an accessory transmission system, a strain gage, a sliding ring electricity introducing device, and a dynamic analysis system. The motor is used as a power source for dragging; the speed increasing gear is connected to the motor for accelerating the rotation speed of the motor and transmitting the rotation speed to the accessory transmission system; the accessory transmission system comprises a gear to be tested and an engine accessory and/or a plane accessory which are installed on a gear to be tested; the strain gage is arranged on a spoke plate for collecting strain signals of the gear to be detected; the slip ring electricity introducing device is connected to the strain gage for transmitting the strain signal of the gear to be tested; the dynamic analysis system is connected to the slip ring electricity introducing device for performing amplification and conditioning on the strain signal of the gear to be tested which is transmitted to the slip ring electricity introducing device and processing and outputting the dynamic strain signal. The invention effectively simulates the real working condition of the accessory transmission gear, the structure is simple and the reliability of the test is high.

The invention discloses a method for quickly testing reliability of BIOS (basic input output system) and OS (operating system) interface codes and relates to the technical field of computers. The method includes steps executed by the BIOS: A) receiving an SMI (system message interruption) available command from a test device so that a CPU (central processing unit) can enter an SMM (system management mode), and running interface codes corresponding to the SMI available command; B) generating an SMM drop-out command after the interface codes corresponding to the SMIS available command stop running; C) receiving an SMI forbidden command from the test device according to the SMM drop-out command so that the CPU can run interface codes corresponding to the SMI forbidden command and drops out of the SMM; D) keeping executing the step A) to C) until whether the interface codes between the BIOS and the OS are reliable or not. On the premise of not installing the OS, the interface codes between the BIOS and the OS can be quickly tested, test steps are more simple and convenient, and test time is greatly saved.

The invention discloses a method for testing an Expander backboard hard disk indicator light based on a Linux system. The method comprises the steps of utilizing a tool kit to conduct state setting and state examination on the Expander backboard hard disk indicator light based on an SES theoretical basis and obtaining corresponding state data; integrating the testing process of at least one state of the Expander backboard hard disk indicator light into a shell script; detecting corresponding states of the Expander backboard hard disk indicator light, generating a testing result and recording the testing result, so that the test is finished. Compared with the prior art, not only can the Expander backboard hard disk indicator light be automatically tested, but also the testing result can be imported into a test log to facilitate viewing in the later period; the method is applicable to multiple RAID cards or SAS cards, testing personnel conveniently match a testing environment, the testing time is saved, and meanwhile, the testing reliability is improved. By modifying a slot number supported by the Expander, the script can be applied to multiple Expanders, and the universality and flexibility of the testing script are embodied.

The invention discloses a method for testing reliability of whole electric motor train units. The method comprises: acquiring fault information of a whole electric motor train unit, including fault types and fault time; generating fault interval time of the fault types according to the fault time; judging whether the fault interval time obeys exponential distribution; calculating a corresponding minimum total running amount according to pre-stored confidence, failure-rate level and allowable fault frequency if so and generating mapping relationship between the failure-rate level, the allowable fault frequency and the minimum total running amount; acquiring the total running amount, fault types and fault frequency thereof of the whole electric motor train unit during test travel; and acquiring the failure-rate level corresponding to the fault type from the mapping relationship according to the total running amount and fault frequency during the test travel. The method can effectively test the reliability of the electric motor train units from a whole-vehicle perspective so as to promote the constant quality improvement of the electric motor train units and improve the quality of operation service.