CN113189369A - Device for testing performance consistency of built-in acceleration sensor of product - Google Patents
Device for testing performance consistency of built-in acceleration sensor of product Download PDFInfo
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- CN113189369A CN113189369A CN202110521024.1A CN202110521024A CN113189369A CN 113189369 A CN113189369 A CN 113189369A CN 202110521024 A CN202110521024 A CN 202110521024A CN 113189369 A CN113189369 A CN 113189369A
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- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P21/00—Testing or calibrating of apparatus or devices covered by the preceding groups
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Abstract
The invention provides a device for testing the performance consistency of a built-in acceleration sensor of a product, belonging to the field of sensor testing, and the device comprises a clamping mechanism, an excitation mechanism, a product connecting mechanism, a sound insulation and vibration isolation mechanism and a signal testing device; the testing device can be applied to the product testing of different appearances, different clamping schemes are customized according to different appearance products, the testing and calibration of diversified products are realized, a large number of products can be tested in batches, the testing speed is high, the testing device can be used for detecting the consistency of the products in batches, detecting the difference of the product performance and screening out abnormal samples.
Description
Technical Field
The invention belongs to the field of sensor testing, and particularly relates to a device for testing the performance consistency of built-in single-axis acceleration sensors of irregular products in batches.
Background
With the continuous development of intelligent wearable electronic products in recent years, more and more products are beginning to be provided with various built-in sensing sensors for monitoring health information such as the position, the action, the heart rate, the blood pressure and the like of a human body, for example, a gyroscope is arranged in an intelligent watch. With the popularity of such consumer electronics products in the global scope, the requirements of consumers on the quality of sound vibration products are continuously improved, more and more test fixtures or devices are applied to the performance tests of various sensitive electronic products and the performance consistency tests of large-batch products, and it becomes one of the contents that the tests are necessary to ensure that the performance of the large-batch products meets the standard and the consistency. Therefore, how to design a testing fixture and a device to test such irregular products, especially the performance consistency of the built-in acceleration sensor, is a matter of considerable research.
For a standard acceleration sensor, sensitivity calibration can be carried out through a standard calibrator before delivery to ensure performance consistency, the appearance of the standard acceleration sensor is regular and easy to install, and the standard acceleration sensor is only limited to test the acceleration value of a certain frequency point; the built-in acceleration sensor of irregular products can not be calibrated through a calibrator, and specific test methods such as a jig for clamping the products, an excitation mechanism, a vibration isolation method and a signal processing method need to be designed for large-batch products on a production line.
The Chinese patent application 201521030359.X discloses an abnormal sound detection device for a shock absorber, which comprises a main control chip, a test bench and a data acquisition module connected with the main control chip, wherein the test bench comprises a lower tool and an upper tool for fixing the shock absorber, a cylinder barrel of the shock absorber is arranged on the lower tool, the lower tool is provided with a first acceleration sensor, a piston rod of the shock absorber is arranged on the upper tool, and the upper end of the piston rod is provided with a second acceleration sensor; the data acquisition module is connected with the first acceleration sensor and the second acceleration sensor. The abnormal sound detection device of the shock absorber can detect the abnormal sound of the shock absorber through the test bench test, thereby avoiding the complex and high-cost road test of the whole vehicle; the detection data is processed and calculated through the main control chip, the accuracy of the finally obtained result is high, the consistency and the repeatability of the detection method are good, but the built-in acceleration sensor is not involved in the application.
Chinese patent application 201810810577.7 discloses a test method for guaranteeing the consistency of indoor and outdoor passing noise measurement conditions of an automobile, which comprises the following steps: carrying out an indoor and outdoor passing noise test, collecting indoor and outdoor test vehicle state parameters and carrying out data processing to obtain indoor and outdoor test vehicle acceleration and engine torque effective values; comparing the acceleration of the indoor and outdoor test vehicles with the effective value of the engine torque, obtaining the acceleration error of the indoor and outdoor test vehicles and the torque error of the engine, judging whether the acceleration error and the torque error of the engine do not exceed corresponding threshold values, if so, meeting the requirement of consistency, and acquiring data of passing the indoor noise test; if not, adjusting the state parameters of the indoor test vehicle, and carrying out the indoor passing noise test again until the error of the indoor passing noise test and the error of the indoor passing noise test do not exceed the corresponding threshold value. The invention ensures the consistency of indoor and outdoor measurement working conditions, can enable an indoor test result to be equivalent to an outdoor test result, solves the problems of long time consumption and low qualification rate of measurement data in a noise test process, and improves the repeatability and the success rate of tests.
The traditional acceleration performance test is carried out on each acceleration sensor one by one through a standard calibrator, the shapes of the acceleration sensors to be calibrated are regular and easy to install, the standard calibrator cannot be used for non-standard sensors and electronic products with built-in sensors, meanwhile, the standard calibrator can only calibrate the sensitivity of a certain frequency point and cannot determine the performance and consistency of the products (or the sensors) in a broadband range.
In order to solve the problems, the invention designs a device for testing the performance consistency of a built-in single-axis acceleration sensor aiming at irregular product forms.
Disclosure of Invention
Based on the problems and the defects in the prior art, the invention provides the device for testing the performance and the consistency of the built-in single-axis acceleration sensor in the shape of a large batch of irregular products.
The technical purpose of the invention is realized by the following technical scheme:
on one hand, the invention provides a device for testing the performance consistency of a built-in acceleration sensor of a product, which comprises a clamping mechanism, an excitation mechanism, a product connecting mechanism, a sound insulation and vibration isolation mechanism and a signal testing device, wherein the clamping mechanism is used for clamping the product;
the excitation mechanism comprises an excitation mechanical structure and a single-axis reference acceleration sensor;
the sound insulation and vibration isolation mechanism comprises a sound insulation mechanism and a vibration isolation mechanism, and the sound insulation mechanism is an acoustic shielding box; the vibration isolation mechanism is a vibration isolation foot pad;
the signal testing device comprises a vibration exciter, a signal acquisition card and upper computer software.
The clamping mechanism is used for clamping, fixing and positioning an object to be tested, the product connecting mechanism is connected with the object to be tested, the single-axis reference acceleration sensor is arranged above the excitation mechanical structure, and the excitation mechanical structure is arranged above the vibration exciter; the vibration exciter install acoustic shielding incasement in, the vibration isolation callus on the sole install four underfoots of acoustic shielding case, signal acquisition card with standard unipolar reference acceleration sensor the vibration exciter with host computer software connect under the control of host computer software, will encourage signal output to vibration exciter, encourage mechanical structure, clamping mechanism and the product that awaits measuring.
The clamping mechanism is used for clamping an object to be detected; the object to be detected is an acceleration sensor or an electronic product with the built-in acceleration sensor; the clamping mechanism can be suitable for products in different forms, namely the core idea is that the clamping mechanism can be subjected to profiling customization according to the shapes of different products; when the clamping mechanism is designed, the vibration receiving direction of the built-in single-axis sensor of the product needs to be ensured to be parallel to the excitation source.
The excitation mechanism is used for providing an excitation source required by testing for an object to be tested, and the single-axis reference acceleration sensor needs to be parallel to the direction of a built-in sensor of a product.
The product connecting mechanism is used for contacting and communicating with a product and transmitting product test data;
the sound insulation mechanism is used for isolating external noise and other interferences through the acoustic shielding box, so that the external noise is prevented from being transmitted into the product clamping mechanism to generate vibration, and the influence is generated on the product or the built-in acceleration sensor test; the vibration isolation mechanism directly considers the influence of the vibration of the external environment, and the influence of the external vibration on the product clamping mechanism is reduced through the vibration isolation foot pad.
The vibration exciter outputs a sweep frequency signal to the vibration exciter through a software control acquisition card so as to excite the clamping mechanism; the signal acquisition card can output signals to the vibration exciter and also can acquire signals of the reference acceleration sensor and then transmit the signals to the upper computer software for algorithm processing; the upper computer software is an output signal control center and an algorithm processing center and is used for outputting signals to the vibration exciter, acquiring reference acceleration signals acquired by the acquisition card and communicating with the product to acquire signals from the product; and finally, performing signal processing and algorithm processing on the reference acceleration signal and the product signal to obtain a signal after the final product signal is normalized, and performing limit judgment on the signal to realize performance test and consistency control.
Compared with the prior art, the invention has the beneficial effects that:
(1) the testing device provided by the invention not only can calibrate the acceleration value of a certain frequency point to obtain the sensitivity, but also can measure the acceleration value in the whole concerned frequency band; the traditional test method can only send out single frequency and can only obtain the acceleration value under the single frequency, namely the sensitivity;
(2) the testing device provided by the invention can be applied to testing products with different shapes, different clamping schemes are customized according to different products with different shapes, and the testing and calibration of diversified products are realized; the traditional test device can only calibrate a single regular form sensor by using a standard calibration vibration source and cannot calibrate and test irregular products;
(3) the testing device provided by the invention can be used for testing a large number of products in batches, is high in testing speed, and can be used for detecting the consistency of the products in batches, detecting the difference of the product performances and screening out abnormal samples; the sensor to be tested in the traditional testing device needs to be fixed on the vibration source in a paraffin or other fixing mode, and the operation time is long.
Drawings
Fig. 1 is a schematic diagram of an apparatus for testing the performance consistency of a product built-in acceleration sensor according to embodiment 1 of the present invention;
fig. 2 is a front view of a device for testing the performance consistency of a product built-in triaxial acceleration sensor according to embodiment 1 of the present invention;
fig. 3 is a top view of the device for testing the performance consistency of the product built-in triaxial acceleration sensor according to embodiment 1 of the present invention;
fig. 4 is a schematic diagram of a positional relationship between a vibration receiving direction of a built-in single-axis sensor and an excitation source of the device for testing performance consistency of a built-in three-axis acceleration sensor of a product in embodiment 1 of the present invention.
Reference numerals: 1-object to be measured (built-in acceleration sensor); 2-a clamping mechanism; 3-exciting the mechanical mechanism; 4-a product attachment mechanism; 5-single axis reference acceleration sensor; 6-a vibration exciter; 7-an acoustic shielding box; 8-vibration isolation foot pad; 9-a signal acquisition card; 10-upper computer software, A1-built-in direction of a sensor to be measured, R1-reference acceleration direction, and E-built-in vibration receiving direction of a single-axis sensor.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings of the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
As shown in figures 1-3: the device for testing the performance consistency of the built-in acceleration sensor of the product comprises a clamping mechanism 2, an excitation mechanism 3, a product connecting mechanism 4, a sound insulation and vibration isolation mechanism and a signal testing device;
the excitation mechanism comprises an excitation mechanical structure 3 and a single-axis reference acceleration sensor 5;
the sound insulation and vibration isolation mechanism comprises a sound insulation mechanism and a vibration isolation mechanism, and the sound insulation mechanism is an acoustic shielding box 7; the vibration isolation mechanism is a vibration isolation foot pad 8;
the signal testing device comprises a vibration exciter 6, a signal acquisition card 9 and upper computer software 10.
The clamping mechanism 2 is used for clamping, fixing and positioning an object to be tested 1, the product connecting mechanism 4 is connected with the object to be tested 1, the single-axis reference acceleration sensor 5 is arranged above the excitation mechanical structure 3, and the excitation mechanical structure 3 is arranged above the vibration exciter 6; the vibration exciter 6 is installed in the acoustic shielding box 7, the vibration isolation foot pad 8 is installed under four feet of the acoustic shielding box 7, the signal acquisition card 9 is connected with the uniaxial reference acceleration sensor 5, the vibration exciter 6 and the upper computer software 10, and under the control of the upper computer software 10, the excitation signal is output to the vibration exciter 6, the excitation mechanical structure 3, the clamping mechanism 2 and the product 1 to be tested.
The clamping mechanism 2 is used for clamping the object 1 to be detected; the object 1 to be measured is an acceleration sensor or an electronic product with the built-in acceleration sensor; the clamping mechanism 2 can be suitable for products with different shapes, namely the core idea is that the clamping mechanism 2 can be subjected to copying customization according to the shapes of different products; as shown in fig. 4, when the clamping mechanism 2 is designed, it is necessary to ensure that the vibration receiving direction of the product built-in single-axis sensor is parallel to the excitation source.
The excitation mechanism is used for providing an excitation source required by the test for the object to be tested, and as shown in fig. 4, the single-axis reference acceleration sensor 5 needs to be parallel to the direction of the built-in sensor of the product.
The product connecting mechanism 4 is used for contacting and communicating with a product and transmitting product test data;
the sound insulation mechanism is used for isolating external noise and other interferences through the acoustic shielding box 7, so that external noise is prevented from being transmitted into the product clamping mechanism to generate vibration, and the influence is generated on the product or the built-in acceleration sensor test; the vibration isolation mechanism directly considers the influence of the vibration of the external environment, and the influence of the external vibration on the product clamping mechanism is reduced through the vibration isolation foot pad 8.
The vibration exciter 6 outputs a frequency sweeping signal to the vibration exciter 6 through the software control signal acquisition card 9 so as to excite the clamping mechanism 2; the signal acquisition card 9 can output signals to the vibration exciter 6, and also can acquire signals of a reference acceleration sensor and transmit the signals to the upper computer software 10 for algorithm processing; the upper computer software 10 is an output signal control center and an algorithm processing center, and is used for outputting signals to the vibration exciter 6, acquiring reference acceleration signals acquired by the acquisition card 9, and communicating with a product to acquire signals from the product; and finally, performing signal processing and algorithm processing on the reference acceleration signal and the product signal to obtain a signal after the final product signal is normalized, and performing limit judgment on the signal to realize performance test and consistency control.
The testing device provided by the invention can be applied to testing products with different shapes, different clamping schemes are customized according to different products with different shapes, the testing and calibration of diversified products are realized, a large number of products can be tested in batches, the testing speed is high, the testing device can be used for detecting the consistency of the products in batches, detecting the difference of the product performances and screening out abnormal samples; the test method provided by the invention not only can calibrate the acceleration value of a certain frequency point to obtain the sensitivity, but also can measure the acceleration value in the whole concerned frequency band.
The above detailed description is specific to possible embodiments of the present invention, and the embodiments are not intended to limit the scope of the present invention, and all equivalent implementations or modifications that do not depart from the scope of the present invention should be included within the scope of the present invention.
Claims (7)
1. The utility model provides a device of test product built-in acceleration sensor performance uniformity which characterized in that: the device comprises a clamping mechanism, an excitation mechanism, a product connecting mechanism, a sound insulation and vibration isolation mechanism and a signal testing device;
the excitation mechanism comprises an excitation mechanical structure and a single-axis reference acceleration sensor;
the sound insulation and vibration isolation mechanism comprises a sound insulation mechanism and a vibration isolation mechanism;
the signal testing device comprises a vibration exciter, a signal acquisition card and upper computer software.
2. The apparatus of claim 1, wherein: the sound insulation mechanism is an acoustic shielding box; the vibration isolation mechanism is a vibration isolation foot pad.
3. The apparatus of claim 2, wherein: the product connecting mechanism is connected with an object to be tested, the single-axis reference acceleration sensor is arranged above the excitation mechanical structure, and the excitation mechanical structure is arranged above the vibration exciter; the vibration exciter install acoustic shielding incasement in, the vibration isolation callus on the sole install four underfoots of acoustic shielding case, signal acquisition card with standard unipolar reference acceleration sensor the vibration exciter with host computer software connect under the control of host computer software, will encourage signal output to vibration exciter, encourage mechanical structure, clamping mechanism and the product that awaits measuring.
4. The apparatus of claim 3, wherein: the clamping mechanism is used for clamping an object to be detected; the object to be measured is an acceleration sensor or an electronic product with the built-in acceleration sensor.
5. The apparatus of claim 4, wherein: when the clamping mechanism is designed, the vibration receiving direction of the built-in single-axis sensor of the product needs to be ensured to be parallel to the excitation source.
6. The apparatus of claim 3, wherein: the uniaxial reference acceleration sensor needs to be parallel to the direction of a built-in sensor of a product.
7. The apparatus of claim 3, wherein: the upper computer software is an output signal control center and an algorithm processing center and is used for outputting signals to the vibration exciter, acquiring reference acceleration signals acquired by the acquisition card and communicating with the product to acquire signals from the product; and finally, performing signal processing and algorithm processing on the reference acceleration signal and the product signal to obtain a signal after the final product signal is normalized, and performing limit judgment on the signal to realize performance test and consistency control.
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