CN111811814A - Dynamic load testing method for composite planetary gear transmission mechanism with wet type gear shifting element - Google Patents
Dynamic load testing method for composite planetary gear transmission mechanism with wet type gear shifting element Download PDFInfo
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- CN111811814A CN111811814A CN202010874433.5A CN202010874433A CN111811814A CN 111811814 A CN111811814 A CN 111811814A CN 202010874433 A CN202010874433 A CN 202010874433A CN 111811814 A CN111811814 A CN 111811814A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
- G01M13/02—Gearings; Transmission mechanisms
- G01M13/021—Gearings
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
- G01M13/02—Gearings; Transmission mechanisms
- G01M13/025—Test-benches with rotational drive means and loading means; Load or drive simulation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
- G01M13/02—Gearings; Transmission mechanisms
- G01M13/028—Acoustic or vibration analysis
Abstract
The invention discloses a dynamic load testing method of a composite planetary gear transmission mechanism with a wet type gear shifting element, which specifically comprises the following steps: a three-way acceleration sensor is arranged on a bearing component in the composite planetary gear transmission mechanism, and a strain test device is arranged on a non-bearing component; carrying out vibration test on the composite planetary gear transmission mechanism under a stable working condition; carrying out no-load vibration test on the composite planetary gear transmission mechanism under an unstable working condition; carrying out loading vibration test on the composite planetary gear transmission mechanism under an unstable working condition; and performing data processing on the obtained three-way acceleration data and the strain data through a signal analysis software system, and analyzing the dynamic load characteristic of the composite planetary gear transmission mechanism based on the processed data. The invention can accurately and reliably measure and obtain the vibration data of the internal components of the compound planetary gear transmission mechanism with the wet type gear shifting element, and carry out dynamic load characteristic analysis through the signal acquisition and analysis system.
Description
Technical Field
The invention belongs to the technical field of vibration testing of planetary gear transmission mechanisms, and particularly relates to a dynamic load testing method of a composite planetary gear transmission mechanism with a wet type gear shifting element.
Background
In the existing vibration testing technology of the planetary gear transmission mechanism, on one hand, the vibration characteristics of the integral input and output shaft ends of the testing mechanism are tested, and the test can be completed by directly arranging an acceleration sensor; on the other hand, the vibration characteristics of the internal components of a single planetary gear train or a simple planetary gear speed change mechanism are tested, which generally requires that a test piece is fixed, the test space is large, a data acquisition system is convenient to arrange, and the test is completed by arranging an acceleration sensor on the fixed test piece.
Inside the compound planetary gear transmission mechanism, the sun gear, the gear ring and the planet carrier in the planetary gear train play the roles of power splitting or converging inside the planetary gear train, and simultaneously serve as an inner hub or an outer hub component of a wet type shifting element, and the torque transmission of the shifting element is realized through spline joint. Therefore, the dynamic load characteristics of the components are complex, and the testing of the components is difficult to realize due to compact structure, narrow space, high-speed rotation, oil-gas mixing, high temperature and the like. Technical means such as acceleration sensor arrangement, data acquisition and transmission modes and the like in the prior art are difficult to be directly applied, and the dynamic load test target of internal components of the composite planetary gear transmission mechanism cannot be achieved.
Disclosure of Invention
Therefore, the invention provides a dynamic load testing method suitable for a composite planetary gear transmission mechanism with a shifting element, which can accurately and reliably measure and obtain vibration data of internal components of the composite planetary gear transmission mechanism, and carry out dynamic load characteristic analysis through a signal acquisition and signal analysis system.
The invention provides a dynamic load testing method of a composite planetary gear transmission mechanism with a wet type gear shifting element, wherein the input end of the composite planetary gear transmission mechanism is connected with a driving mechanism comprising a motor and a gear box through an input shaft, the output end of the composite planetary gear transmission mechanism is connected with a dynamometer through an output shaft, a torsion tester and a first velocimeter are arranged on the input shaft, and a second velocimeter is arranged on the output shaft; the dynamic load testing method comprises the following steps:
step 1: a three-way acceleration sensor is arranged on a bearing component in the compound planetary gear transmission mechanism, and a strain test device is arranged on a non-bearing component;
step 2: carrying out vibration test on the composite planetary gear transmission mechanism under a stable working condition to obtain three-way acceleration data and strain data under the stable working condition;
and step 3: carrying out no-load vibration test on the composite planetary gear transmission mechanism under an unstable working condition to obtain three-way acceleration data and strain data under the no-load condition and the unstable working condition;
and 4, step 4: carrying out loading vibration test on the composite planetary gear transmission mechanism under an unstable working condition to obtain three-way acceleration data and strain data under a loading condition and an unstable working condition;
and 5: and (3) performing data processing on the three-way acceleration data and the strain data obtained in the step (2-4) through a signal analysis software system, and analyzing the dynamic load characteristic of the composite planetary gear transmission mechanism based on the processed data.
In some embodiments, the compound planetary gear transmission may be a compound planetary gear transmission with dual ring gears, the carrier member includes a first ring gear, a sun gear, and a planet carrier, the first ring gear being an input element, the sun gear being a fixed element, the planet carrier being an output element; the non-carrier member comprises a second ring gear floating and connected with the wet shift element by its external splines;
in step 1, three-way acceleration sensors are arranged on the fixed supports of the first ring gear and the planet carrier and on the shaft of the sun gear, and a strain test device is arranged on the second ring gear.
In some embodiments, the compound planetary gear transmission may be a compound planetary gear transmission with dual sun gears, the carrier member includes a first sun gear, a second sun gear, and a planet carrier, the first sun gear being an input element, the second sun gear being a fixed element, the planet carrier being an output element; the non-carrier member comprises a ring gear floating and connected with the wet shifting element by its external splines;
in step 1, three-way acceleration sensors are arranged on fixed supporting pieces of the first sun gear and the planet carrier and on a shaft of the second sun gear, and a strain testing device is arranged on the gear ring.
In some embodiments, the strain testing device may include a plurality of high temperature strain gages and a plurality of dynamic strain gauges, and a single dynamic strain gauge may be connected to 1-4 high temperature strain gages.
In some embodiments, the plurality of high temperature strain gages may be provided at least two internal tooth roots and at least two external spline roots of the second ring gear or the ring gear; the plurality of dynamic strain gauges may be provided on a side end face of the second ring gear or the ring gear;
the plurality of high-temperature strain gauges and the plurality of dynamic strain gauges are evenly arranged in the circumferential direction of the second gear ring or the gear ring.
In some embodiments, one high-temperature strain gauge may be arranged in each internal tooth root portion in the circumferential direction and the tooth width direction of the second ring gear or the ring gear, and one high-temperature strain gauge may be arranged in each external spline root portion in the circumferential direction and the tooth width direction of the second ring gear or the ring gear.
In some embodiments, the specific process of step 2 may be: the stable working point of the composite planetary gear transmission mechanism with obvious dynamic load is predetermined, the rotating speed and the torque required by the stable working point are achieved by adjusting the motor and the dynamometer, the composite planetary gear transmission mechanism stably runs under the stable working point, and three-way acceleration data and strain data under the stable working condition are obtained by using a three-way acceleration sensor and a strain testing device.
In some embodiments, the specific process of step 3 may be: the output end of the compound planetary gear transmission mechanism is not loaded, the input rotating speed is regulated by the motor to be uniformly increased from the lowest stable rotating speed to the highest stable rotating speed, and a three-way acceleration sensor and a strain testing device are used for measuring; and when the input rotating speed reaches the highest stable rotating speed, adjusting the motor to reduce the input rotating speed from the highest stable rotating speed to the lowest stable rotating speed at a constant speed, and measuring by using a three-way acceleration sensor and a strain testing device to obtain three-way acceleration data and strain data under the no-load condition and the unstable working condition.
In some embodiments, the specific process of step 4 may be: loading the output end of the compound planetary gear transmission mechanism, and adjusting the load of the output end of the compound planetary gear transmission mechanism through the motor; adjusting the motor to uniformly increase the input rotating speed of the compound planetary gear transmission mechanism from the lowest stable rotating speed to the highest stable rotating speed, and measuring by using a three-way acceleration sensor and a strain testing device; and when the input rotating speed reaches the highest stable rotating speed, adjusting the motor to reduce the input rotating speed from the highest stable rotating speed to the lowest stable rotating speed at a constant speed, and measuring by using a three-way acceleration sensor and a strain testing device to obtain three-way acceleration data and strain data under a loading condition and an unstable working condition.
In some embodiments, the specific process of step 5 may be: and (3) performing data processing on the three-way acceleration data and the strain data obtained in the step (2-4) by using a signal processing method of converting the obtained time domain sequence into a frequency domain sequence by using a signal analysis software system and adopting Fourier transform.
The invention has the beneficial effects that:
1) the synchronous vibration testing device can realize the synchronous and real-time vibration testing of the vibration signals of a plurality of components in the high-temperature oil-gas mixed gearbox body;
2) the vibration testing device can meet the vibration testing requirement of the high-speed rotating part under the constraint of the wet type gear shifting element;
3) the invention solves the problem of the meshing impact vibration test of the high-speed rotating part in a narrow space by combining the high-temperature strain gauge and the dynamic strain gauge, and is suitable for a bearing component of a composite planetary gear transmission mechanism and a non-bearing component of the composite planetary gear transmission mechanism.
Drawings
FIG. 1 is a schematic view of a dynamic load test structure of a compound planetary gear transmission mechanism with double ring gears according to embodiment 1;
FIG. 2 is a schematic view of a dynamic load test structure of a compound planetary gear transmission mechanism with double sun gears of embodiment 2;
FIG. 3 is a schematic view showing the mounting of the high temperature strain gauge of examples 1 and 2;
FIG. 4 is a schematic view showing the installation of the dynamic strain gauge of examples 1 and 2;
fig. 5 is a flowchart of a dynamic load testing method of the compound planetary gear transmission mechanism with the wet shifting element.
In the drawings:
1-a motor; 2-torque measuring instrument; 3. 18-a velocimeter; 4-a gearbox; 5. 17-a coupling; 6. 20-an input shaft; 8. 12, 28-ring gear; 7. 15, 22, 24-fixed supports; 9. 26-long planetary gear; 10. 25-short planet wheels; 11. 27-wet shifting elements; 13. 21, 29-sun gear; 14. 23-a planet carrier; 16. 30-an output shaft; 19-a dynamometer; 31. 32-high temperature strain gage; 33-dynamic strain gauge.
Detailed Description
The invention is further described below with reference to the accompanying drawings and examples, it being understood that the examples described below are intended to facilitate the understanding of the invention, and are not intended to limit it in any way.
Example 1
As shown in fig. 1, in the embodiment, the dynamic load test is performed on the compound planetary gear transmission mechanism with the double gear rings, and the test device includes a motor 1, a torque meter 2, a velocimeter 3, a gear box 4, a coupler 5, compound planetary gear transmission mechanisms with the double gear rings 6-16, a coupler 17, a velocimeter 18, and a dynamometer 19, which are connected in sequence. The compound planetary gear transmission mechanism with the double gear rings comprises an input shaft 6, a gear ring 8 and a fixed support 7 thereof, a long planetary gear 9, a short planetary gear 10, a wet shifting element 11, a gear ring 12, a sun gear 13, a planet carrier 14 and a fixed support 15 thereof, and an output shaft 16. Wherein, the small gear ring 8 is connected with the input shaft 6, the planet carrier 14 is connected with the output shaft 16, the long planet wheel 9 is simultaneously meshed with the gear ring 8, the sun wheel 13 and the short planet wheel 10, and the short planet wheel 10 is simultaneously meshed with the long planet wheel 9 and the gear ring 12.
The invention designs that a three-way acceleration sensor is arranged on a bearing component inside a compound planetary gear transmission mechanism so as to measure the acceleration of the bearing component in the test process, and a strain test device is arranged on a non-bearing component so as to measure the strain of the non-bearing component in the test process. As can be seen from the above interlocking relationship of the respective members, the carrier member inside the double ring gear compound planetary gear mechanism includes the rotating elements (the ring gear 8 and the carrier 14) and the fixed element (the sun gear 13), and the non-carrier member includes the ring gear 12 serving as the hub of the wet shift element 11. Advantageously, three-way acceleration sensors (indicated by the pentagons in the figures) are arranged on the fixed support 7 of the ring gear 8, on the fixed support 15 of the planet carrier 14 and on the axis of the sun gear 13, respectively; a strain gauge (indicated by a triangle in the drawing) is arranged on the ring gear 12.
Example 2
As shown in fig. 2, in the embodiment, the dynamic load test is performed on the compound planetary gear transmission mechanism with the double sun gears, and the test device includes a motor 1, a torque meter 2, a velocimeter 3, a gear box 4, a coupler 5, compound planetary gear transmission mechanisms with the double sun gears 20-30, a coupler 17, a velocimeter 18, and a dynamometer 19, which are connected in sequence. The compound planetary gear transmission with sun gear of the present embodiment includes an input shaft 20, a sun gear 21 and its fixed support 22, a carrier 23 and its fixed support 24, short planetary gears 25, long planetary gears 26, a wet shift element 27, a ring gear 28, a sun gear 29, and an output shaft 30. The sun gear 21 is connected to the input shaft 20, the carrier 23 is connected to the output shaft 30, the long planetary gear 26 is simultaneously engaged with the ring gear 28, the short planetary gear 25 and the sun gear 29, and the short planetary gear 25 is simultaneously engaged with the long planetary gear 26 and the sun gear 21.
As can be seen from the above linked relationship of the respective members, the carrier member inside the double sun compound planetary gear mechanism includes the rotating elements (the sun gear 21 and the carrier 23) and the fixed element (the sun gear 29), and the non-carrier member includes the ring gear 28 serving as the hub of the wet shift element 27. Advantageously, three-way acceleration sensors (indicated by the pentagons in the figures) are arranged on the fixed support 22 of the sun wheel 21, on the fixed support 24 of the planet carrier 23 and on the axis of the sun wheel 29, respectively; strain gauges (indicated by triangles in the drawing) are arranged on the ring gear 27. It should be noted that both ring gear 12 and ring gear 28 should meet balance testing requirements.
Preferably, in the present embodiments 1 and 2, 8 to 16 high temperature strain gauges are provided in total at the root portions of the internal teeth and the four root portions of the external splines of the ring gears 12, 28, wherein, as shown in fig. 3, two high temperature strain gauges 31, 32 are arranged at each root portion of the internal teeth and each root portion of the external splines, respectively, in the circumferential direction and the tooth width direction of the ring gears 12, 28. Meanwhile, as shown in fig. 4, 6, or 8 dynamic strain gauges 33 are uniformly provided on the corresponding side end surfaces. And the high-temperature strain gauge and the dynamic strain gauge are connected by wire harnesses so as to acquire and store strain data in real time. Because the composite planetary gear transmission mechanism with the wet type gear shifting element is in high-temperature oil-gas mixing work, the dynamic strain gauge should be used for lubricating oil splashing protection in advance.
In particular, the high temperature strain gages and the dynamic strain gauges are arranged uniformly circumferentially along the ring gear 12, 28, with only the circumferential uniform distribution of the dynamic strain gauges being shown in FIG. 4.
The dynamic load test method of the compound planetary gear transmission with wet shifting elements of the present invention will be described in detail below, as shown in fig. 5, including the steps of:
step 1: as described above, the three-way acceleration sensor is arranged on the bearing member inside the compound planetary gear transmission mechanism, and the high-temperature strain gauge and the dynamic strain gauge are arranged on the non-bearing member;
step 2: predetermining a stable working point of the composite planetary gear transmission mechanism with obvious dynamic load, adjusting the motor 1 and the dynamometer 19 to reach the rotating speed and torque required by the stable working point, so that the composite planetary gear transmission mechanism stably runs at the stable working point, and obtaining three-way acceleration data and strain data under a loading condition and a stable working condition by using the three-way acceleration sensor, the high-temperature strain gauge and the dynamic strain gauge which are arranged in the step 1;
and step 3: the output end of the compound planetary gear transmission mechanism is not loaded (namely the output shafts 16 and 30 are not connected with the dynamometer 19), the input rotating speed is regulated by the motor 1 to be uniformly increased from the lowest stable rotating speed to the highest stable rotating speed, and a three-way acceleration sensor, a high-temperature strain gauge and a dynamic strain gauge are used for measurement; when the input rotating speed reaches the highest stable rotating speed, the adjusting motor 1 reduces the input rotating speed from the highest stable rotating speed to the lowest stable rotating speed at a constant speed, and a three-way acceleration sensor, a high-temperature strain gauge and a dynamic strain gauge are used for measuring to obtain three-way acceleration data and strain data under the no-load condition and the unstable working condition;
and 4, step 4: loading the output end of the compound planetary gear transmission mechanism (namely the output shafts 16 and 30 are connected with the dynamometer 19), and adjusting the load of the output end of the compound planetary gear transmission mechanism through the motor 1, wherein the load is obtained by calculating according to the loading torque of the input end; the input rotating speed of the composite planetary gear transmission mechanism is uniformly increased from the lowest stable rotating speed to the highest stable rotating speed by the adjusting motor 1, and a three-way acceleration sensor, a high-temperature strain gauge and a dynamic strain gauge are used for measuring; when the input rotating speed reaches the highest stable rotating speed, the adjusting motor 1 reduces the input rotating speed from the highest stable rotating speed to the lowest stable rotating speed at a constant speed, and a three-way acceleration sensor, a high-temperature strain gauge and a dynamic strain gauge are used for measuring to obtain three-way acceleration data and strain data under a loading condition and an unstable working condition;
and 5: and (3) performing data processing on the three-way acceleration data and the strain data obtained in the step (2-4) by a signal processing method of converting the obtained time domain sequence into a frequency domain sequence by adopting Fourier transform through a signal analysis software system, and analyzing the dynamic load characteristic of the composite planetary gear transmission mechanism based on the processed data.
It will be apparent to those skilled in the art that various modifications and improvements can be made to the embodiments of the present invention without departing from the inventive concept thereof, and these modifications and improvements are intended to be within the scope of the invention.
Claims (10)
1. A dynamic load test method of a composite planetary gear transmission mechanism with a wet type gear shifting element is characterized in that the input end of the composite planetary gear transmission mechanism is connected with a driving mechanism comprising a motor and a gear box through an input shaft, the output end of the composite planetary gear transmission mechanism is connected with a dynamometer through an output shaft, a torsion tester and a first velocimeter are arranged on the input shaft, and a second velocimeter is arranged on the output shaft; the dynamic load testing method comprises the following steps:
step 1: a three-way acceleration sensor is arranged on a bearing component in the compound planetary gear transmission mechanism, and a strain test device is arranged on a non-bearing component;
step 2: carrying out vibration test on the composite planetary gear transmission mechanism under a stable working condition to obtain three-way acceleration data and strain data under the stable working condition;
and step 3: carrying out no-load vibration test on the composite planetary gear transmission mechanism under an unstable working condition to obtain three-way acceleration data and strain data under the no-load condition and the unstable working condition;
and 4, step 4: carrying out loading vibration test on the composite planetary gear transmission mechanism under an unstable working condition to obtain three-way acceleration data and strain data under a loading condition and an unstable working condition;
and 5: and (3) performing data processing on the three-way acceleration data and the strain data obtained in the step (2-4) through a signal analysis software system, and analyzing the dynamic load characteristic of the composite planetary gear transmission mechanism based on the processed data.
2. The method of claim 1, wherein the compound planetary gear set is a compound planetary gear set with dual ring gears, the carrier member includes a first ring gear, a sun gear, and a planet carrier, the first ring gear being an input element, the sun gear being a stationary element, the planet carrier being an output element; the non-carrier member comprises a second ring gear floating and connected with the wet shift element by its external splines;
in step 1, three-way acceleration sensors are arranged on the fixed supports of the first ring gear and the planet carrier and on the shaft of the sun gear, and a strain test device is arranged on the second ring gear.
3. The method of claim 2, wherein the strain testing device comprises a plurality of high temperature strain gages and a plurality of dynamic strain gauges, a single dynamic strain gauge being connected to 1-4 high temperature strain gages;
arranging the plurality of high-temperature strain gauges at least two inner tooth roots and at least two outer spline roots of the second ring gear; arranging the plurality of dynamic strain gauges on a side end surface of the second ring gear;
the plurality of high-temperature strain gauges and the plurality of dynamic strain gauges are evenly arranged along the circumferential direction of the second ring gear.
4. The method according to claim 3, wherein one high-temperature strain gauge is arranged in each of the second ring gear circumferential direction and the tooth width direction at each of the internal tooth root portions, and one high-temperature strain gauge is arranged in each of the second ring gear circumferential direction and the tooth width direction at each of the external spline root portions.
5. The method of claim 1, wherein the compound planetary gear set is a compound planetary gear set with dual sun gears, the carrier member includes a first sun gear, a second sun gear, and a planet carrier, the first sun gear is an input element, the second sun gear is a stationary element, and the planet carrier is an output element; the non-carrier member comprises a ring gear floating and connected with the wet shifting element by its external splines;
in step 1, three-way acceleration sensors are arranged on fixed supporting pieces of the first sun gear and the planet carrier and on a shaft of the second sun gear, and a strain testing device is arranged on the gear ring.
6. The method of claim 5, wherein the strain testing device comprises a plurality of high temperature strain gages and a plurality of dynamic strain gauges, a single dynamic strain gauge being connected to between 1 and 4 high temperature strain gages;
arranging the plurality of high-temperature strain gauges at least two inner tooth roots and at least two outer spline roots of the ring gear; arranging the plurality of dynamic strain gauges on a side end face of the ring gear;
the plurality of high-temperature strain gauges and the plurality of dynamic strain gauges are evenly arranged along the circumferential direction of the gear ring.
7. The method according to claim 6, wherein one high-temperature strain gauge is arranged in each of the ring gear circumferential direction and the tooth width direction at each of the internal tooth roots, and one high-temperature strain gauge is arranged in each of the ring gear circumferential direction and the tooth width direction at each of the external spline roots.
8. The method according to one of claims 1 to 7, wherein the step 2 comprises the following specific processes: the stable working point of the composite planetary gear transmission mechanism with obvious dynamic load is predetermined, the rotating speed and the torque required by the stable working point are achieved by adjusting the motor and the dynamometer, the composite planetary gear transmission mechanism stably runs under the stable working point, and three-way acceleration data and strain data under the stable working condition are obtained by using a three-way acceleration sensor and a strain testing device.
9. The method according to any one of claims 1 to 7, wherein the step 3 comprises the following specific steps: the output end of the compound planetary gear transmission mechanism is not loaded, the input rotating speed is regulated by the motor to be uniformly increased from the lowest stable rotating speed to the highest stable rotating speed, and a three-way acceleration sensor and a strain testing device are used for measuring; and when the input rotating speed reaches the highest stable rotating speed, adjusting the motor to reduce the input rotating speed from the highest stable rotating speed to the lowest stable rotating speed at a constant speed, and measuring by using a three-way acceleration sensor and a strain testing device to obtain three-way acceleration data and strain data under the no-load condition and the unstable working condition.
10. The method according to one of claims 1 to 7, wherein the step 4 comprises the following specific processes: loading the output end of the compound planetary gear transmission mechanism, and adjusting the load of the output end of the compound planetary gear transmission mechanism through the motor; adjusting the motor to uniformly increase the input rotating speed of the compound planetary gear transmission mechanism from the lowest stable rotating speed to the highest stable rotating speed, and measuring by using a three-way acceleration sensor and a strain testing device; when the input rotating speed reaches the highest stable rotating speed, adjusting the motor to reduce the input rotating speed from the highest stable rotating speed to the lowest stable rotating speed at a constant speed, and measuring by using a three-way acceleration sensor and a strain testing device to obtain three-way acceleration data and strain data under a loading condition and an unstable working condition;
the specific process of the step 5 is as follows: and (3) performing data processing on the three-way acceleration data and the strain data obtained in the step (2-4) by using a signal processing method of converting the obtained time domain sequence into a frequency domain sequence by using a signal analysis software system and adopting Fourier transform.
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| CN112595443A (en) * | 2020-11-27 | 2021-04-02 | 重庆大学 | Gear ring load distribution detection system and method |
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