CN114354190A - Motor bearing random dynamic load testing device and testing method - Google Patents
Motor bearing random dynamic load testing device and testing method Download PDFInfo
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Abstract
The invention relates to a motor bearing, in particular to a random dynamic load of the motor bearing, and specifically relates to a device and a method for testing the random dynamic load of the motor bearing. The invention provides a novel motor bearing random dynamic load testing device, aiming at solving the problem that the motor bearing random dynamic load testing device and the testing method in the prior art are easy to cause inaccurate testing of the motor bearing random dynamic load, and the novel motor bearing random dynamic load testing device comprises a bearing bush, wherein the bearing bush is provided with four positioning holes and an adjusting through hole, and each positioning hole is internally provided with a dynamometer fixing component; all be equipped with dynamometer adjusting part in every regulation through-hole, dynamometer adjusting part includes the regulating block, and the regulating block is located between the up end of piezoelectric dynamometer and the upper portion lateral wall of adjusting through-hole, and the one side of regulating block and adjusting through-hole contact is the inclined plane. According to the testing device, the piezoelectric dynamometer can be directly contacted with the outer ring of the motor bearing, and the pretightening force can be adjusted through the inclined plane on the adjusting block, so that the testing result is more accurate.
Description
Technical Field
The invention relates to a motor bearing, in particular to a random dynamic load of the motor bearing, and specifically relates to a device and a method for testing the random dynamic load of the motor bearing.
Background
In recent years, along with the development of rail transit towards a high-speed heavy-load direction, motor bearings providing power traction for rail transit frequently have faults, and the motor bearings are core components of a traction motor and play a role in connecting a rotor of a rotating part and a stator of a fixing part. The use reliability of the motor bearing determines the use reliability of the traction motor. The most critical factor for determining the use reliability of the motor bearing is the actual load bearing of the bearing besides the design and manufacture of the bearing. The load of rail transit motor bearings in a service environment is often referred to as random dynamic load. How to accurately measure the actual random dynamic load of the motor bearing is always an important breakthrough for solving the problems of motor bearing failure, bearing type selection and bearing design by scientific research and technical personnel.
The motor bearing random dynamic load testing device in the prior art comprises a groove formed on an axle box and a resistance strain gauge adhered to the inner side wall of the groove, by loading a specific load on the inner ring of the motor bearing and recording the strain value of the strain gauge, then, a functional relation is established between the specific load loaded by the motor bearing and the strain value tested by the strain gauge so as to achieve load calibration, but the key of the method for testing the random dynamic load of the motor bearing by adopting the testing device is the sticking position and the quality of the resistance strain gauge, the sticking position of the resistance strain gauge needs to select a stress sensitive position, the shaft box body of the motor bearing has higher rigidity and smaller strain, so the micro load is difficult to accurately detect and the test is inaccurate, meanwhile, the sticking quality of the resistance strain gauge is easily interfered by environmental factors and human factors, so that the test of the resistance strain gauge is inaccurate.
Disclosure of Invention
The invention provides a novel testing device and a testing method for random dynamic load of a motor bearing, aiming at solving the problem that the testing device and the testing method for the random dynamic load of the motor bearing in the prior art are prone to causing inaccurate testing of the random dynamic load of the motor bearing.
The invention is realized by adopting the following technical scheme:
a random dynamic load testing device for a motor bearing comprises a bearing bush (known by technicians in the field, the bearing bush has a certain thickness in the axial direction and the radial direction) sleeved on the outer ring of the motor bearing (the motor bearing is used for a test), a data acquisition system, a signal adjustment instrument, a dynamometer data cable and a matched data acquisition unit, wherein the piezoelectric dynamometer is known by the technicians in the field, the piezoelectric dynamometer is in a hexagonal cylinder shape, the bottom of the piezoelectric dynamometer is a detection end, and meanwhile, in order to facilitate the installation of the data cable, one side wall of the hexagonal cylinder is provided with a cylindrical cable interface end, the axial direction of the cylindrical cable interface end is vertical to the axial direction of the hexagonal cylinder, the signal adjustment instrument, the dynamometer data cable and the matched data acquisition unit are arranged on the end face of a circular ring at one end of the bearing bush, four cables are arranged along the axial direction of the bearing bush and are uniformly distributed in the circumferential direction of the bearing bush, The piezoelectric dynamometer is characterized by comprising four strip-shaped positioning holes which are communicated with a bearing outer ring and used for positioning the piezoelectric dynamometer and an adjusting through hole used for adjusting the pretightening force of the piezoelectric dynamometer, wherein the bottom of the piezoelectric dynamometer in each positioning hole is abutted against the motor bearing outer ring, and a dynamometer fixing component which is used for positioning the piezoelectric dynamometer in the axial direction of a bearing bush is arranged in each positioning hole; each adjusting through hole is internally provided with a dynamometer adjusting component, each dynamometer adjusting component comprises a third fixing plate and a strip-shaped adjusting block arranged along the axial direction of the bearing bush, each adjusting block is clamped between the upper end face of the piezoelectric dynamometer and the upper side wall in the corresponding adjusting through hole, one face, contacting with the corresponding adjusting through hole, of each adjusting block is an inclined face, the third fixing plate is blocked at one end opening of the corresponding adjusting through hole, two end portions of the third fixing plate are fixedly connected with the end face of the ring at one end of the bearing bush, the middle portion of the third fixing plate is provided with a first threaded hole and at least one fixing through hole, each adjusting block is provided with at least one second threaded hole which is arranged along the axial direction of the bearing bush and is matched with the corresponding fixing through hole, a first bolt penetrates through the first threaded hole to push the adjusting block so that the adjusting block can move towards the end face of the ring at the other end close to the bearing bush along the axial direction of the bearing bush, and a second bolt penetrates through the corresponding fixing through hole, The second threaded hole is used for pulling the adjusting block so as to move the adjusting block towards the end ring end face close to the bearing bush along the axial direction of the bearing bush.
The working principle is as follows: the piezoelectric dynamometer is fixed through a dynamometer fixing component in the positioning hole, when the pretightening force of the piezoelectric dynamometer is adjusted, the axial position of the adjusting block is moved by the fact that the through hole is required to be adjusted to be in contact with the adjusting block through an inclined surface, when the adjusting block is required to be pushed to move, the second bolt is loosened, the first bolt is rotated to enable the first bolt to push the adjusting block to move to a proper position, and then the second bolt is installed; when needs pulling the regulating block and removing, unscrew first bolt, adopt the lead screw principle to pass through the second bolt through rotatory second bolt behind through-hole, the second screw hole and pull the regulating block and remove and install first bolt again after suitable position, such structural design makes piezoelectric dynamometer can direct contact motor bearing outer lane and can adjust the pretightning force at any time through the dynamometer regulating assembly according to the circumstances, has improved the accuracy of test.
Further, the locating hole is the square blind hole, the piezoelectric dynamometer with the relative lateral wall butt of the lateral wall at piezoelectric dynamometer's cable interface end place in the bottom of locating hole, every dynamometer fixed subassembly includes the locating piece and the first fixed plate of two right angle trapezoidal shapes, the second fixed plate, the inclined plane of two locating pieces is laminated respectively in piezoelectric dynamometer with two lateral walls that the cable interface end of piezoelectric dynamometer is adjacent, the lower bottom surface of two locating pieces is laminated respectively in the relative both sides wall of locating hole, the right angle face of two locating pieces all aligns with the one end ring terminal surface of bearing bush, first fixed plate, the second fixed plate is fixed respectively with two locating pieces and all is fixed with the one end ring terminal surface of bearing bush, thereby make the piezoelectric dynamometer by the bottom centre gripping location of two locating pieces and locating hole. The piezoelectric dynamometer is ingeniously fixed by utilizing a hexagonal column-shaped structure of the piezoelectric dynamometer and adopting a right-angled trapezoid-shaped positioning block, and the piezoelectric dynamometer is novel and unique in conception.
A method for testing the random dynamic load of a motor bearing sequentially comprises the following steps: 1) Starting a data acquisition system, setting a data acquisition mode option of a data acquisition unit as a direct current coupling mode, setting a sensitivity option of the data acquisition unit as a sensitivity numerical value of a force sensor, setting a sensor power supply mode option of the data acquisition unit as an external power supply mode, setting a data acquisition mode option of a signal adjusting instrument as a direct current coupling mode, setting a zero position option of the signal adjusting instrument as automatic zero adjustment, and adjusting the pre-tightening force of a piezoelectric dynamometer to the load display of the data acquisition unit by using a dynamometer adjusting component so as to finish the loading of the pre-tightening force of the four piezoelectric dynamometers; 2) loading fixed loads step by step on an inner ring of a motor bearing and recording actual loads of data collectors corresponding to each piezoelectric dynamometer, then enabling the loaded fixed loads to correspond to the actual loads of the data collectors one by one, and forming a calibration load curve through polynomial curve fitting (the polynomial curve fitting is an algorithm well known by a person skilled in the art) to finish calibration of the dynamic load; 3) setting a data acquisition mode option of a data acquisition unit as an alternating current coupling mode, setting a data acquisition mode option of a signal adaptation instrument as the alternating current coupling mode, loading a random dynamic load on an inner ring of a motor bearing, recording a real-time load of the data acquisition unit, and converting the acquired real-time load into an actual random dynamic load of the motor bearing through a calibration load curve after the acquisition is completed. The direct-current coupling mode and the alternating-current coupling mode of the data acquisition system are ingeniously combined with the fixed load calibration and the dynamic load acquisition, and the problem that the random dynamic load of the bearing is difficult to measure is well solved.
The beneficial effects produced by the invention are as follows: 1) the piezoelectric dynamometer is adopted, so that the problem that the measurement result is inaccurate due to the fact that the measurement result is limited by the pasting position and the quality of the strain gauge in the strain gauge testing process is effectively solved;
2) the invention adopts direct current coupling to carry out load calibration and alternating current coupling to carry out random dynamic load data acquisition, thereby effectively solving the problems of load calibration and random dynamic load data acquisition of the piezoelectric dynamometer;
3) the invention can carry out real-time data acquisition on the load of the bearing in the random dynamic load environment, and provides data support for bearing model selection design, bearing design, failure analysis and the like;
4) according to the testing device, the piezoelectric dynamometer can be directly contacted with the outer ring of the motor bearing, the pretightening force is adjustable, and meanwhile, the pretightening force of the piezoelectric dynamometer is adjustable, so that the situation that data cannot be detected due to the fact that a resistance strain gauge is small in load when the testing device is used for testing in the prior art is avoided, and the situation that the testing is inaccurate due to the interference of environmental factors and human factors is also avoided.
Drawings
FIG. 1 is a schematic view of the installation of a motor bearing and a bearing bushing according to the present invention;
FIG. 2 is an enlarged view of a portion of FIG. 1 at A;
FIG. 3 is a cross-sectional view B-B of FIG. 2;
fig. 4 is a schematic view showing the assembly of the piezoelectric dynamometer and the positioning block (the view angle is the top view of fig. 3).
In the figure: 1-motor bearing, 2-bearing bush, 3-piezoelectric dynamometer, 4-locating hole, 5-adjusting through hole, 6-third fixed plate, 7-adjusting block, 8-fixing through hole, 9-first threaded hole, 10-second threaded hole, 11-second bolt, 12-locating block, 13-first fixed plate, 14-second fixed plate, 15-fourth bolt, 16-dynamometer data cable, 17-data collector, 18-cable interface end, and 19-signal adjusting instrument.
Detailed Description
A random dynamic load testing device for a motor bearing comprises a bearing bush 2 (known by technicians in the field, the bearing bush 2 has a certain thickness in the axial direction and the radial direction) fixedly sleeved on the outer ring of a motor bearing 1 (the motor bearing is used for testing), and a data acquisition system, wherein the data acquisition system comprises a piezoelectric dynamometer 3 (known by technicians in the field, the piezoelectric dynamometer 3 is in a hexagonal cylinder shape, the bottom of the piezoelectric dynamometer is a detection end, meanwhile, for convenience of installation of a data cable, one side wall of the hexagonal cylinder is provided with a cylindrical cable interface end 18, the axial direction of which is vertical to the axial direction of the hexagonal cylinder, a signal adjustment instrument 19, a dynamometer data cable 16 and a matched data acquisition device 17, four cable interface ends which are arranged along the axial direction of the bearing bush 2 and are uniformly distributed in the circumferential direction of the bearing bush 2 are arranged on the annular end face of one end of the bearing bush 2, The piezoelectric dynamometer comprises four strip-shaped positioning holes 4 communicated with an outer ring of a bearing and used for positioning the piezoelectric dynamometer 3 and adjusting through holes 5 used for adjusting the pretightening force of the piezoelectric dynamometer 3, wherein the bottom of the piezoelectric dynamometer 3 in each positioning hole 4 is abutted against the outer ring of a motor bearing 1, and a dynamometer fixing component used for positioning the piezoelectric dynamometer 3 in the axial direction of a bearing bush 2 is arranged in each positioning hole 4; each adjusting through hole 5 is internally provided with a dynamometer adjusting assembly, each dynamometer adjusting assembly comprises a third fixing plate 6 and a strip-shaped adjusting block 7 arranged along the axial direction of the bearing bush 2, each adjusting block 7 is clamped between the upper end surface of the piezoelectric dynamometer 3 and the upper side wall of the corresponding adjusting through hole 5, one surface, contacting with the corresponding adjusting through hole 5, of each adjusting block 7 is an inclined surface, the third fixing plate 6 is blocked at one end opening of the corresponding adjusting through hole 5, two end portions of the third fixing plate are fixedly connected with one end ring end surface of the corresponding bearing bush 2, the middle portion of the third fixing plate 6 is provided with a first threaded hole 9 and at least one fixing through hole, each adjusting block 7 is provided with at least one second threaded hole 10 which is arranged along the axial direction of the corresponding bearing bush 2 and is matched with the corresponding fixing through hole, and a first bolt penetrates through the first threaded hole 9 to push each adjusting block 7 so as to enable each adjusting block 7 to move towards the other end ring end surface close to the corresponding bearing bush 2 along the axial direction of the corresponding bearing bush 2, the second bolt 11 passes through the fixing through hole and the second threaded hole 10 to pull the adjusting block 7 so as to move the adjusting block 7 toward the end face of the ring near one end of the bearing bush 2 in the axial direction of the bearing bush 2.
The working principle is as follows: the piezoelectric dynamometer 3 is fixed through a dynamometer fixing component in the positioning hole 4, when the pretightening force of the piezoelectric dynamometer 3 is adjusted, the axial position of the adjusting block 7 is moved by the fact that the through hole 5 and the adjusting block 7 are required to be adjusted to be in contact with each other through an inclined plane, when the adjusting block 7 is required to be pushed to move, the second bolt 11 is loosened, and the first bolt is rotated to enable the first bolt to push the adjusting block 7 to move to a proper position and then the second bolt 11 is installed; when needs pulling regulating block 7 and removing, unscrew first bolt, adopt the lead screw principle with second bolt 11 pass the through-hole, install first bolt again after second screw hole 10 comes pulling regulating block 7 to remove to suitable position through rotatory second bolt 11, such structural design makes piezoelectric dynamometer 3 can the direct contact 1 outer lane of motor bearing and can adjust the pretightning force at any time according to the circumstances through dynamometer regulating assembly, has improved the accuracy of test.
In specific implementation, the positioning hole 4 is a square blind hole, the side wall of the piezoelectric dynamometer 3 opposite to the side wall where the cable interface end 18 of the piezoelectric dynamometer 3 is located abuts against the bottom of the positioning hole 4, each dynamometer fixing component comprises two right-angled trapezoidal positioning blocks 12, a first fixing plate 13 and a second fixing plate 14, the inclined surfaces of the two positioning blocks 12 are respectively attached to the two side walls of the piezoelectric dynamometer 3 adjacent to the side wall where the cable interface end 18 of the piezoelectric dynamometer 3 is located, the lower bottom surfaces of the two positioning blocks 12 are respectively attached to the two opposite side walls of the positioning hole 4, the right-angled surfaces of the two positioning blocks 12 are both aligned with the annular end surface at one end of the bearing bush 2, the first fixing plate and the second fixing plate are respectively fixed with the two positioning blocks 12 and are both fixed with the annular end surface at one end of the bearing bush 2, so that the piezoelectric dynamometer 3 is clamped and positioned by the two positioning blocks 12 and the bottom of the positioning hole 4. The structure skillfully fixes the piezoelectric dynamometer 3 by utilizing the hexagonal column-shaped structure of the piezoelectric dynamometer 3 and adopting the right-angled trapezoid-shaped positioning block 12, and the design is novel and unique.
During concrete implementation, the bottom of the piezoelectric dynamometer 3 is located at the axial center position of the outer ring of the motor bearing 1, so that the test structure is relatively more accurate. The inclined plane of regulating block 7 and the contact of adjusting through-hole 5 is acute angle and bearing bush 2's axial and the inclined plane on regulating block 7 and the adjusting through-hole 5 all is through polishing treatment, and the regulation of pretightning force is conveniently carried out to such structure. Second screw hole 10 on regulating block 7 is the screw thread through-hole for the moving range of regulating block 7 in regulating hole 5 is bigger, is favorable to the regulation of 3 pretightning forces of piezoelectric dynamometer more, makes test structure more accurate. The fixing through holes are two and are symmetrically distributed on the left side and the right side of the first threaded hole 9 respectively, so that the stability of the adjusting structure is facilitated.
In this embodiment, both end portions of the third fixing plate 6 are fixedly connected to the end surface of the ring at one end of the bearing bush 2 by the third bolt. The first fixing plate 13 and the second fixing plate 14 are respectively fixedly connected with the two positioning blocks 12 through fourth bolts 15. The first fixing plate 13 and the second fixing plate 14 are respectively fixedly connected with the two sides of the positioning hole 4 on the end face of the ring at one end of the bearing bush 2 through a fifth bolt. The structure concreties, standardizes, makes things convenient for the installation in dismantlement of this testing arrangement simultaneously.
The method for testing the random dynamic load of the motor bearing by using the device sequentially comprises the following steps: 1) starting a data acquisition system, setting a data acquisition Mode option (Coupling Mode) of a data acquisition unit 17 as a direct current Coupling Mode (DC), setting a Sensitivity option (Sensitivity) of the data acquisition unit 17 as a Sensitivity value of a force sensor, setting a sensor power supply Mode option of the data acquisition unit 17 as an External power supply Mode (External), setting an acquisition Mode option (ACDC) of a signal adjusting instrument 19 as the direct current Coupling Mode (DC), setting a ZERO position option (ZERO) of the signal adjusting instrument 19 as an automatic ZERO setting (AUTOZERO), and adjusting the pre-tightening force of a piezoelectric dynamometer 3 by using a dynamometer adjusting component until the data acquisition unit 17 displays the load, thereby completing the loading of the pre-tightening force of four piezoelectric dynamometers 3; 2) loading fixed loads step by step on the inner ring of the motor bearing 1, recording the actual load of the data collector 17 corresponding to each piezoelectric dynamometer 3, corresponding the loaded fixed loads and the actual loads of the data collectors 17 one by one, and forming a calibration load curve through polynomial curve fitting to finish calibration of the dynamic load; 3) setting a data acquisition Mode option (Coupling Mode) of the data acquisition unit 17 as an alternating current Coupling Mode (AC), setting an data acquisition Mode option (ACDC) of the signal adaptation instrument 19 as the alternating current Coupling Mode (AC), loading a random dynamic load on an inner ring of the motor bearing 1, recording a real-time load of the data acquisition unit 17, and converting acquired real-time data into an actual random dynamic load of the motor bearing 1 through a calibration load curve after the acquisition is finished.
Claims (10)
1. The random dynamic load testing device for the motor bearing is characterized by comprising a bearing bush (2) fixedly sleeved on the outer ring of the motor bearing (1) and a data acquisition system, wherein the data acquisition system comprises a piezoelectric dynamometer (3), a signal adjusting instrument (19), a dynamometer data cable (16) and a matched data acquisition unit (17), four positioning holes (4) which are arranged along the axial direction of the bearing bush (2) and uniformly distributed in the circumferential direction of the bearing bush (2) and communicated with the outer ring of the motor bearing (1) and used for positioning the piezoelectric dynamometer (3) and adjusting through holes (5) used for adjusting the pretightening force of the piezoelectric dynamometer (3) are formed in the end face of a ring at one end of the bearing bush (2), the bottom of the dynamometer (3) in each positioning hole (4) is abutted against the outer ring of the motor bearing (1), a dynamometer fixing component for positioning the piezoelectric dynamometer (3) in the axial direction of the bearing bush (2) is arranged in each positioning hole (4); all be equipped with dynamometer regulating assembly in every regulation through-hole (5), dynamometer regulating assembly includes third fixed plate (6) and along the axial arrangement's of bearing bush (2) banding regulating block (7), regulating block (7) are pressed from both sides between the up end of piezoelectric dynamometer (3) and the upper portion lateral wall in regulation through-hole (5), the one side of regulating block (7) and regulation through-hole (5) contact is the inclined plane, third fixed plate (6) keep off in the one end opening of regulation through-hole (5) and its both ends divide all with the one end ring terminal surface fixed connection of bearing bush (2), the mid portion of third fixed plate (6) is opened there are first screw hole (9) and at least one fixed through-hole, it has at least one to arrange and with the second screw hole (10) of fixed through-hole looks adaptation along the axial of bearing bush (2) to open on regulating block (7), first bolt passes first screw hole (9) and is used for promoting regulating block (7) so that regulating block (7) are followed regulating block (7) The second bolt (11) penetrates through the fixing through hole, and the second threaded hole (10) is used for pulling the adjusting block (7) so as to enable the adjusting block (7) to move towards the end face of the ring at one end close to the bearing bush (2) along the axial direction of the bearing bush (2).
2. The random dynamic load testing device for the motor bearing, according to claim 1, is characterized in that the positioning hole (4) is a square blind hole, the side wall of the piezoelectric dynamometer (3) opposite to the side wall where the cable interface end (18) of the piezoelectric dynamometer (3) is located abuts against the bottom of the positioning hole (4), each dynamometer fixing component comprises two right-angle trapezoidal positioning blocks (12), a first fixing plate (13) and a second fixing plate (14), the inclined surfaces of the two positioning blocks (12) are respectively attached to the two side walls of the piezoelectric dynamometer (3) adjacent to the side wall where the cable interface end (18) of the piezoelectric dynamometer (3) is located, the lower bottom surfaces of the two positioning blocks (12) are respectively attached to the two opposite side walls of the positioning hole (4), and the right-angle surfaces of the two positioning blocks (12) are aligned with the end face of the circular ring at one end of the bearing bush (2), the first fixing plate (13) and the second fixing plate (14) are fixed with the two positioning blocks (12) respectively and are fixed with the end face of the circular ring at one end of the bearing bush (2), so that the piezoelectric dynamometer (3) is clamped and positioned by the two positioning blocks (12) and the bottoms of the positioning holes (4).
3. The motor bearing random dynamic load testing device is characterized in that the bottom of the piezoelectric dynamometer (3) is located at the axial center of the outer ring of the motor bearing (1).
4. The motor bearing random dynamic load testing device according to claim 3, characterized in that the inclined plane of the adjusting block (7) contacting the adjusting through hole (5) and the axial direction of the bearing bushing (2) form an acute angle, and the inclined planes of the adjusting block (7) and the adjusting through hole (5) are both polished.
5. The motor bearing random dynamic load testing device according to claim 4, characterized in that the second threaded hole (10) on the adjusting block (7) is a threaded through hole.
6. The motor bearing random dynamic load testing device of claim 5, wherein two fixing through holes are arranged and symmetrically distributed on the left side and the right side of the first threaded hole (9).
7. The motor bearing random dynamic load testing device according to claim 6, characterized in that two end parts on the third fixing plate (6) are fixedly connected with an end ring end face of one end of the bearing bush (2) through a third bolt.
8. The motor bearing random dynamic load testing device according to claim 7, wherein the first fixing plate (13) and the second fixing plate (14) are respectively fixedly connected with the two positioning blocks (12) through fourth bolts (15).
9. The motor bearing random dynamic load testing device according to claim 8, wherein the first fixing plate (13) and the second fixing plate (14) are fixedly connected with the two sides of the positioning hole (4) on the end face of the ring at one end of the bearing bush (2) through a fifth bolt respectively.
10. The motor bearing random dynamic load testing method adopting the motor bearing random dynamic load testing device as claimed in any one of claims 1 to 9 is characterized by sequentially comprising the following steps: 1) starting a data acquisition system, setting a data acquisition mode option of a data acquisition unit (17) into a direct current coupling mode, setting a sensitivity option of the data acquisition unit (17) into a sensitivity numerical value of a force sensor, setting a sensor power supply mode option of the data acquisition unit (17) into an external power supply mode, setting a data acquisition mode option of a signal adjusting instrument (19) into a direct current coupling mode, setting a zero position option of the signal adjusting instrument (19) into automatic zero adjustment, and adjusting the pretightening force of a piezoelectric dynamometer (3) by using a dynamometer adjusting component until the data acquisition unit (17) displays the load, thereby completing the loading of the pretightening force of four piezoelectric dynamometers (3); 2) loading fixed loads on the inner ring of the motor bearing (1) step by step and recording the actual loads of the data collectors (17) corresponding to each piezoelectric dynamometer (3), then enabling the loaded fixed loads to correspond to the actual loads of the data collectors (17) one by one, and forming a calibration load curve through polynomial curve fitting to finish calibration of the dynamic load; 3) setting a data acquisition mode option of a data acquisition unit (17) as an alternating current coupling mode, setting a data acquisition mode option of a signal adaptation instrument (19) as the alternating current coupling mode, loading a random dynamic load on an inner ring of a motor bearing (1), recording a real-time load of the data acquisition unit (17), and converting acquired real-time data into an actual random dynamic load of the motor bearing (1) through a calibration load curve after the acquisition is finished.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116067655A (en) * | 2023-03-06 | 2023-05-05 | 西安航天动力研究所 | Part testing device, part testing equipment and part testing method |
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