Bearing assembly oil film thickness measurement systems, methods, devices, apparatuses, and media

Abstract

The application relates to the technical field of rolling bearing lubrication, and discloses a bearing assembly oil film thickness measuring system, method, device, equipment and medium, the measuring system comprises a base, a cylinder, an oil film testing module and an integrated control module; the cylinder is installed on the base, a vacuum chamber is formed between the base and the cylinder, and a bearing assembly to be measured is arranged in the vacuum chamber; the oil film testing module comprises a slip ring and an oil film capacitance tester, the slip ring is arranged in the vacuum chamber and connected with the bearing assembly to be measured, the slip ring is connected with the oil film capacitance tester arranged outside the vacuum chamber through an electric connector, and the oil film capacitance tester is used for measuring the oil film capacitance value of the bearing assembly to be measured; and the integrated control module is used for converting the oil film capacitance value to obtain the oil film thickness. The application solves the problem that the prior art cannot measure the oil film thickness of a control moment gyro bearing assembly under vacuum conditions.

Description

Technical Field

[0001] This invention relates to the field of rolling bearing lubrication technology, specifically to a bearing assembly oil film thickness measurement system, method, device, equipment, and medium. Background Technology

[0002] As the core actuator for attitude control of spacecraft, the control moment gyroscope (CMG) determines the accuracy and stability of its torque output through the thickness of the oil film and the lubrication performance of its internal bearing components.

[0003] The control moment gyroscope bearing assembly operates under harsh on-orbit conditions, including vacuum, variable speed, and high and low temperatures. Currently, some systems use ultrasonic sensors to measure oil film thickness. However, ultrasonic signals are easily affected by environmental noise. Ultrasonic sensors are point-based, making it difficult to capture the instantaneous moment when the bearing roller passes through the measurement point. Furthermore, they cannot meet the requirements of special measurement conditions, such as high and low temperature or vacuum conditions. They can only meet the needs of bearing measurement under normal temperature and pressure. Summary of the Invention

[0004] In view of this, embodiments of the present invention provide a bearing assembly oil film thickness measurement system, method, device, equipment and medium to solve the problem that the prior art cannot achieve the measurement of oil film thickness of control torque gyroscope bearing assemblies under vacuum conditions.

[0005] In a first aspect, embodiments of the present invention provide a bearing assembly oil film thickness measurement system, the measurement system including a base, a cylinder, an oil film testing module and an integrated control module;

[0006] The cylinder is mounted on the base, forming a vacuum chamber between the cylinder and the base. The bearing assembly to be tested is placed in the vacuum chamber.

[0007] The oil film testing module includes a slip ring and an oil film capacitance tester. The slip ring is set in the vacuum chamber and connected to the bearing assembly under test. The slip ring is connected to the oil film capacitance tester set outside the vacuum chamber via an electrical connector. The oil film capacitance tester is used to measure the oil film capacitance value of the bearing assembly under test.

[0008] The integrated control module is used to convert the oil film capacitance value to obtain the oil film thickness.

[0009] The bearing assembly oil film thickness measurement system provided in this invention mounts a cylinder on a base, forming a vacuum chamber between the cylinder and the base. The bearing assembly to be tested is placed in the vacuum chamber, providing vacuum conditions for measuring the oil film thickness of the control torque gyroscope bearing assembly. Through the connection between the slip ring and the oil film capacitance tester and the bearing assembly to be tested, the oil film capacitance value of the bearing assembly to be tested is measured. The oil film thickness is obtained by converting the oil film capacitance value through an integrated control module, thus solving the problem that the prior art cannot measure the oil film thickness of the control torque gyroscope bearing assembly under vacuum conditions.

[0010] In conjunction with the first aspect, in one embodiment, the cylinder is formed by welding flanges to seamless steel pipes. The upper end of the cylinder is sealed by a vacuum chamber cover consisting of a first sealing gasket and an observation window. The lower end is fixedly connected by bolts and a second sealing gasket and then installed on the base, forming a sealed vacuum chamber with the base.

[0011] The bearing assembly oil film thickness measurement system provided in this embodiment of the invention is formed by welding flanges to seamless steel pipes. The upper end of the cylinder is sealed by a vacuum chamber cover consisting of a first sealing gasket and an observation window. The lower end is fixedly connected to the base by bolts and a second sealing gasket and then installed on the base, forming a vacuum chamber with the base. This provides a vacuum environment for measuring the oil film thickness of the bearing assembly and realizes the measurement of the oil film thickness of the bearing assembly under vacuum conditions.

[0012] In one alternative implementation, the measurement system further includes a vacuum module, which includes a vacuum pump, a vacuum valve, a vacuum sensor, and a vacuum gauge.

[0013] The base is provided with multiple openings for installing multiple quick-connect couplings, including a first quick-connect coupling and a second quick-connect coupling; a vacuum valve is connected to the first quick-connect coupling via a vacuum line, and the vacuum valve is connected to a vacuum pump; a vacuum sensor is connected to the second quick-connect coupling via a vacuum line; a vacuum gauge is connected to both the vacuum sensor and the integrated control module.

[0014] The vacuum valve is used to turn the vacuum pump on or off to perform the evacuation operation; the vacuum sensor is used to measure the air pressure value in the vacuum chamber and transmit the air pressure value to the vacuum gauge; the vacuum gauge is used to display the air pressure value and transmit the air pressure value to the integrated control module, which is used to adjust the opening or closing of the vacuum valve according to the air pressure value.

[0015] The bearing assembly oil film thickness measurement system provided in this invention, through the design of the vacuum valve and vacuum pump in the vacuum module, realizes the vacuum pump operation of opening or closing as needed. The vacuum pressure value of the vacuum chamber is measured by the vacuum sensor and transmitted to the vacuum gauge. The vacuum gauge can display the pressure value and transmit the pressure value to the integrated control module. The integrated control module adjusts the opening or closing device of the vacuum valve according to the pressure value, realizing the visualization of the operator and meeting the need to measure the oil film thickness of the bearing assembly under vacuum conditions.

[0016] In one optional embodiment, the measurement system further includes: a temperature measurement module disposed in a vacuum chamber, the temperature measurement module including a resistance temperature detector (RTD) sensor, a heating plate, and a thermoelectric cooler;

[0017] The resistance temperature detector, heating plate, and thermoelectric cooler are all led out of the vacuum chamber and connected to the integrated control module via electrical connector wires.

[0018] The resistance temperature sensor is used to detect the temperature of the vacuum chamber and transmit the temperature data to the integrated control module;

[0019] The integrated control module is used to control the heating plate to heat the vacuum chamber or the semiconductor cooling chip to cool the vacuum chamber based on the relationship between the temperature data and the first preset value.

[0020] The bearing assembly oil film thickness measurement system provided in this embodiment of the invention, by setting a temperature measurement module in a vacuum chamber, the temperature measurement module detects the temperature of the vacuum chamber by a thermistor sensor and transmits the temperature data to an integrated control module; the integrated control module is used to control the heating plate to heat the vacuum chamber or the semiconductor cooling chip to cool the vacuum chamber according to the relationship between the temperature data and a first preset value, thereby realizing the measurement of the bearing assembly oil film thickness under preset temperature conditions.

[0021] In one optional embodiment, the measurement system further includes: a rotational speed measurement module disposed in a vacuum chamber, the rotational speed measurement module including a motor and a drive unit;

[0022] The drive unit is used to drive the motor; the motor and the bearing assembly under test are coaxially arranged.

[0023] The motor is equipped with a speed sensor, which is used to measure the rotational speed of the bearing assembly under test and transmit the rotational speed to the integrated control module.

[0024] The integrated control module is used to convert the rotational speed into voltage data, and controls the motor to adjust the rotational speed of the bearing assembly under test based on the relationship between the voltage data and a second preset value.

[0025] The bearing assembly oil film thickness measurement system provided in this embodiment of the invention can adjust the rotational speed of the bearing assembly under test by setting a rotational speed measurement module in a vacuum chamber, thereby realizing the measurement of the oil film thickness of the bearing assembly under preset rotational speed conditions.

[0026] In one optional embodiment, the measurement system further includes a slip ring support module, which includes a slip ring bracket, a slip ring sleeve, and a tensioning sleeve. The slip ring bracket is mounted on a base, one end of the slip ring is fixedly mounted on the slip ring bracket, the slip ring sleeve is mounted on the other end of the slip ring, and the tensioning sleeve is mounted between the slip ring sleeve and the bearing assembly to be tested. The slip ring, slip ring sleeve, and tensioning sleeve are all coaxially arranged with the bearing assembly to be tested.

[0027] The bearing assembly oil film thickness measurement system provided in this embodiment of the invention uses a slip ring support module to mount the bearing assembly under test onto a motor, and the slip ring bracket is mounted on a base. The slip ring, slip ring sleeve, and tensioning sleeve in the slip ring support module are all coaxially arranged with the bearing assembly under test, ensuring the stability of the strength of the entire measurement system and making it safe and reliable.

[0028] Secondly, embodiments of the present invention provide a method for measuring the oil film thickness of a bearing assembly, the method comprising:

[0029] Place the bearing assembly to be tested in a vacuum environment;

[0030] Acquire temperature data of the vacuum environment and rotational speed data of the bearing assembly under test;

[0031] When the temperature data equals the first preset value and the rotation speed data equals the second preset value, the oil film capacitance value of the measuring bearing assembly is obtained;

[0032] The oil film thickness of the bearing assembly under test is calculated based on the oil film capacitance value.

[0033] The bearing assembly oil film thickness measurement method provided in this invention sets the bearing assembly to be tested in a vacuum environment, providing vacuum conditions for measuring the oil film thickness of the bearing assembly. The oil film thickness is calculated based on the oil film capacitance value, solving the problem that the prior art cannot achieve the measurement of the oil film thickness of the control torque gyroscope bearing assembly under vacuum conditions.

[0034] Thirdly, embodiments of the present invention provide a bearing assembly oil film thickness measuring device, the measuring device comprising:

[0035] Vacuum operation module, used to place the bearing assembly under test in a vacuum environment;

[0036] The first acquisition module is used to acquire temperature data of the vacuum environment and rotational speed data of the bearing assembly under test;

[0037] The second acquisition module is used to acquire the oil film capacitance value of the measuring bearing assembly when the temperature data is equal to the first preset value and the rotation speed data is equal to the second preset value.

[0038] The calculation module is used to calculate the oil film thickness of the bearing assembly based on the oil film capacitance value.

[0039] Fourthly, embodiments of the present invention provide a computer device, including: a memory and a processor, the memory and the processor being communicatively connected to each other, the memory storing computer instructions, and the processor executing the computer instructions to perform the bearing assembly oil film thickness measurement method described in the second aspect.

[0040] Fifthly, embodiments of the present invention provide a computer-readable storage medium storing computer instructions for causing a computer to execute the bearing assembly oil film thickness measurement method described in the second aspect. Attached Figure Description

[0041] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0042] Figure 1 This is a structural block diagram of a bearing assembly oil film thickness measurement system according to some embodiments of the present invention;

[0043] Figure 2 This is a structural block diagram of the bearing assembly under test according to some embodiments of the present invention;

[0044] Figure 3 This is a structural block diagram of another bearing assembly oil film thickness measurement system according to some embodiments of the present invention;

[0045] Figure 4 This is a structural block diagram of another bearing assembly oil film thickness measurement system according to some embodiments of the present invention;

[0046] Figure 5 This is a structural block diagram of another bearing assembly oil film thickness measurement system according to some embodiments of the present invention;

[0047] Figure 6 This is a structural block diagram of another bearing assembly oil film thickness measurement system according to some embodiments of the present invention;

[0048] Figure 7 This is a graph showing the variation of oil film thickness and stability with rotational speed according to some embodiments of the present invention;

[0049] Figure 8 These are curves showing the variation of bearing oil film thickness with rotational speed at different temperatures under vacuum conditions, according to some embodiments of the present invention.

[0050] Figure 9 This is a schematic flowchart of a bearing assembly oil film thickness measurement method according to some embodiments of the present invention;

[0051] Figure 10 This is a structural block diagram of a bearing assembly oil film thickness measuring device according to an embodiment of the present invention;

[0052] Figure 11 This is a schematic diagram of the hardware structure of a computer device according to an embodiment of the present invention. Detailed Implementation

[0053] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0054] This invention provides a bearing assembly oil film thickness measurement system. Figure 1 This is a structural block diagram of a bearing assembly oil film thickness measurement system according to some embodiments of the present invention, such as... Figure 1 As shown, the measurement system includes a base 11, a cylinder 12, an oil film testing module 14, and an integrated control module 15. The cylinder 12 is mounted on the base 11, forming a vacuum chamber between the cylinder and the base 11. The bearing assembly 13 to be tested is placed in the vacuum chamber. The oil film testing module includes a slip ring 141 and an oil film capacitance tester 142. The slip ring 141 is placed in the vacuum chamber and connected to the bearing assembly 13 to be tested. The slip ring 141 is connected to the oil film capacitance tester 142, which is located outside the vacuum chamber, through an electrical connector. The oil film capacitance tester 142 is used to measure the oil film capacitance value of the bearing assembly to be tested. The integrated control module 15 is used to convert the oil film capacitance value into the oil film thickness.

[0055] Specifically, the oil film thickness of a certain type of control torque gyroscope bearing assembly (CMG bearing assembly) was measured, and its structural diagram is shown below. Figure 2As shown, a pair of B7004C angular contact ball bearings 22 are arranged between the bearing assembly fixed shaft 21 and the wheel body 25. The bearing preload can be adjusted by the inner and outer loading sleeves 23 and the loading nut 24. The fixed shaft 21 is mounted on the motor stator. When the CMG bearing assembly is running, the wheel body 25 is driven by the motor rotor, and the gyro torque is adjusted by controlling the rotational speed. The bearing assembly also includes an inner ring 26 and an outer ring 27. The B7004C angular contact balls are installed between the inner ring 26 and the outer ring 27. Lubricating oil is filled between the inner and outer rings of the bearing assembly. The oil film thickness is obtained by measuring the oil film capacitance 28 of the lubricating oil and then converting it.

[0056] Combination Figure 1 The measurement system includes a base 11 and a cylinder 12. The cylinder 12 is mounted on the base 11, forming a vacuum chamber between the cylinder and the base 11. The bearing assembly 13 to be tested is placed in the vacuum chamber to ensure a vacuum environment for measuring the oil film thickness of the bearing assembly. A multi-pole vacuum socket is provided on the base 11 for transmitting relevant power and capacitance values. The measurement system also includes an oil film testing module 14 and an integrated control module 15. The oil film testing module includes a slip ring 141 and an oil film capacitance tester 142. The slip ring 141 is placed in the vacuum chamber and connected to the bearing assembly 13 to be tested. The slip ring 141 can be a mercury slip ring. The slip ring 141 is connected to the oil film capacitance tester 142, which is located outside the vacuum chamber, via an electrical connector. The oil film capacitance tester 142 measures the oil film capacitance value between the inner and outer rings of the bearing in the bearing assembly under test and transmits the oil film capacitance value to the integrated control module. The integrated control module 15 converts the oil film capacitance value to obtain the oil film thickness.

[0057] The 142 oil film capacitance tester can be equipped with a high-precision LCR tester, allowing for settings of the test range, frequency range, and AC test level to meet the accuracy requirements for measuring minute capacitances such as the oil film in bearing assemblies under test. The LCR tester has a maximum sampling frequency of 10kHz, avoiding information loss caused by high-frequency oil film capacitance changes during high-speed rotation of the bearing assembly under test; and a minimum AC test level of 20mV, preventing oil film breakdown that may occur when the oil film thickness is small. When the bearing assembly under test is stationary, the raceways between the angular contact ball bearing and the inner and outer rings of the bearing assembly are in direct contact. This allows for short-circuit correction of the measurement system, and the oil film capacitance tester can compensate for other stray capacitances in the measurement system to improve test accuracy. Furthermore, to reduce electromagnetic interference from external sources, the electrical connector uses twisted-pair shielded cable to transmit test signals. The shielding layer reduces signal crosstalk and noise interference between adjacent lines, further improving measurement accuracy.

[0058] The measured oil film capacitance value is converted into an oil film thickness value using a method based on the Hertzian contact principle combined with capacitance calculation to obtain the conversion relationship between oil film thickness and oil film capacitance under different conditions. The formula is as follows:

[0059]

[0060] Where: C is the measured value of oil film capacitance, ε0 is the vacuum dielectric constant, and ε r Where S is the relative permittivity, S is the contact area between the B7004C angular contact ball bearing and the inner ring of the bearing assembly, and d is the oil film thickness. Based on this calculation formula, the measured oil film capacitance can be converted into oil film thickness.

[0061] The bearing assembly oil film thickness measurement system provided in this invention mounts a cylinder on a base, forming a vacuum chamber between the cylinder and the base. The bearing assembly to be tested is placed in the vacuum chamber, providing vacuum conditions for measuring the oil film thickness of the control torque gyroscope bearing assembly. Through the connection between the slip ring and the oil film capacitance tester and the bearing assembly to be tested, the oil film capacitance value of the bearing assembly to be tested is measured. The oil film thickness is obtained by converting the oil film capacitance value through an integrated control module, thus solving the problem that the prior art cannot measure the oil film thickness of the control torque gyroscope bearing assembly under vacuum conditions.

[0062] In some optional embodiments, the cylinder is formed by welding flanges to seamless steel pipes. The upper end of the cylinder is sealed by a vacuum chamber cover consisting of a first sealing gasket and an observation window. The lower end is fixedly connected to the base by bolts and a second sealing gasket, forming a vacuum chamber with the base. Specifically, when measuring the lubrication performance of the bearings in the CMG bearing assembly, it is necessary to simulate the actual working conditions of the space bearing, requiring the environmental vacuum level to reach 5-10 Pa. Therefore, the vacuum chamber is formed by welding flanges to seamless steel pipes. The upper end of the cylinder is sealed by a vacuum chamber cover consisting of a first sealing gasket and an observation window. The lower end is fixed to the base by bolts and a second sealing gasket, forming a vacuum chamber with a sealed space. When the vacuum chamber is implemented by welding, the following requirements should be met:

[0063] (1) Seamless steel pipes should be used as much as possible for the vacuum chamber cavity, and the weld seams of the upper and lower flanges should be as short as possible to reduce leakage holes and air leakage. The weld between the seamless steel pipe and the flange should be tested for airtightness; the first sealing gasket should meet the airtightness test.

[0064] (2) The location of the weld should be designed to facilitate the inspection of the airtightness, and the first and second sealing gaskets should meet the requirements of the airtightness inspection.

[0065] The observation window is made of 5mm thick tempered glass. In addition, polytetrafluoroethylene gaskets are required on the top and bottom of the tempered glass to avoid stress concentration.

[0066] In some alternative embodiments, combined with Figure 3 The measurement system also includes: a vacuum module 16, which includes a vacuum pump 161, a vacuum valve 162, a vacuum sensor 163, and a vacuum gauge 164; the base 11 has multiple openings for mounting multiple quick-connect couplings, including a first quick-connect coupling and a second quick-connect coupling; the vacuum valve 162 is connected to the first quick-connect coupling 111 via a vacuum line, and the vacuum valve 162 is connected to the vacuum pump 161; the vacuum sensor 163 is connected to the second quick-connect coupling 112 via a vacuum line; the vacuum gauge 164 is connected to both the vacuum sensor 163 and the integrated control module 15; the vacuum valve 162 is used to turn the vacuum pump 161 on or off to perform vacuuming; the vacuum sensor 163 is used to measure the air pressure value of the vacuum chamber and transmit the air pressure value to the vacuum gauge; the vacuum gauge 164 is used to display the air pressure value and transmit the air pressure value to the integrated control module 15, and the integrated control module 15 is used to adjust the opening or closing of the vacuum valve 162 according to the air pressure value.

[0067] Specifically, a first quick-connect coupling is welded to an opening on the base of the vacuum chamber. This first quick-connect coupling can be a KF quick-connect coupling (KF indicates a quick-release flange used in vacuum environments). The KF quick-connect coupling is used to install vacuum tubing, which can be implemented using a flexible bellows. A vacuum valve is installed through the vacuum tubing, and the vacuum pump is connected to the vacuum valve. A second quick-connect coupling is installed on the base of the vacuum chamber. This second quick-connect coupling can also be a KF quick-connect coupling. A vacuum sensor, which can be a ZJ52-T resistance gauge, is installed through the vacuum tubing on the KF quick-connect coupling. The vacuum sensor is connected to a vacuum gauge, which displays the pressure value of the vacuum chamber and sends this pressure value to the integrated control module. The integrated control module can be implemented using a programmable logic controller (PLC), and the pressure value is displayed on the PLC's display.

[0068] In some optional embodiments, the measurement system further includes: a temperature measurement module 17 disposed in a vacuum chamber, the temperature measurement module 17 including a resistance temperature detector (RTD) sensor 171, a heating plate 172, and a thermoelectric cooler 173; the RTD sensor 171, the heating plate 172, and the thermoelectric cooler 173 are all led out of the vacuum chamber and connected to the integrated control module 15 via electrical connectors; the RTD sensor 171 is used to detect the temperature of the vacuum chamber and transmit the temperature data to the integrated control module 15; the integrated control module 15 is used to control the heating plate 172 to heat the vacuum chamber or the thermoelectric cooler 173 to cool the vacuum chamber according to the relationship between the temperature data and a first preset value.

[0069] Specifically, in combination Figure 4The resistance temperature detector (RTD) 171, heating plate 172, and thermoelectric cooler 173 are all connected to the integrated control module 15 after being led out of the vacuum chamber via electrical connectors. The integrated control module 15 includes a first PID control unit (PID stands for proportional, integral, and derivative). The RTD 171 measures the temperature of the vacuum chamber and transmits the temperature data to the first PID control unit. The first PID control unit compares the temperature data with a first preset value, for example, the first preset value can be set to 60°C. When the temperature data does not reach 60°C, the first PID control unit sends a control signal to the heating plate to make the heating plate work to raise the temperature of the vacuum chamber until the temperature of the vacuum chamber rises to 60°C and the heating plate stops working. When the temperature data exceeds 60°C, the first PID control unit sends a control signal to the thermoelectric cooler to make the thermoelectric cooler work to lower the temperature of the vacuum chamber until the temperature of the vacuum chamber drops to 60°C and the thermoelectric cooler stops working.

[0070] In some optional embodiments, the measurement system further includes: a rotational speed measurement module 18 disposed in a vacuum chamber, the rotational speed measurement module including a motor 181 and a drive unit 182; the drive unit 182 is used to drive the motor 182 to work; the motor 181 is coaxially disposed with the bearing assembly 13 under test; a speed sensor is disposed in the motor, the speed sensor is used to measure the rotational speed of the bearing assembly 13 under test and transmit the rotational speed to the integrated control module 15; the integrated control module 15 is used to convert the rotational speed into voltage data, and control the motor 181 to adjust the rotational speed of the bearing assembly under test according to the relationship between the voltage data and a second preset value.

[0071] Specifically, in combination Figure 5 The drive unit 182 is connected to the motor 181 to drive the motor 181. The motor 181 is connected to the bearing assembly under test and is coaxially arranged with the bearing assembly under test 13. The integrated control module 15 also includes a second PID control unit. A speed sensor is installed in the motor 181 to measure the rotational speed of the bearing assembly under test in real time and transmit the speed data to the second PID control unit. The second PID control unit converts the speed data into voltage data and adjusts the rotational speed of the bearing assembly under test according to the relationship between the voltage data and a second preset value. The speed data is converted into voltage data according to the following formula:

[0072] n=U-(IR+L*di / dt) / Kφ

[0073] Where: n is the rotational speed of the bearing assembly under test, U is the voltage data, I is the current of the bearing assembly under test, R is the resistance of the bearing assembly under test, L is the inductance of the motor rotor coil, di / dt is the differential, representing the current passing through the coil per unit time, φ is the excitation flux of the motor rotor, and K is the induced electromotive force constant of the motor stator. The voltage data is compared with a second preset value. When the voltage data is lower than the second preset value, the second PID control unit controls the output voltage to increase, thereby increasing the rotational speed of the bearing assembly under test; conversely, when the voltage data is higher than the second preset value, the second PID control unit controls the output voltage to decrease, thereby decreasing the rotational speed of the bearing assembly under test.

[0074] When the second PID control unit detects a speed deviation in the bearing assembly under test, it calculates the control output voltage value by comparing the actual speed with the second preset value to minimize the speed deviation. The second PID control unit controls the speed of the bearing assembly under test within the range of 0 r / min to 1500 r / min. For example, if the second preset value is set to 500 r / min, according to the measurement requirements of the measurement system, the second PID control unit adjusts the speed of the bearing assembly under test to 500 r / min, achieving stable adjustment in approximately 30 seconds. The stable speed deviation does not exceed 0.1%, demonstrating high control accuracy.

[0075] In some alternative embodiments, combined with Figure 6 The measurement system also includes a slip ring support module 19, which comprises a slip ring bracket 191, a slip ring sleeve 192, and a tensioning sleeve 193. The slip ring bracket is mounted on the base 11, one end of the slip ring 141 is fixedly mounted on the slip ring bracket 191, the slip ring sleeve 192 is mounted on the other end of the slip ring 141, and the tensioning sleeve 193 is mounted between the slip ring sleeve 192 and the bearing assembly 13 under test. The slip ring 141, slip ring sleeve 192, and tensioning sleeve 193 are all coaxially arranged with the bearing assembly 13 under test. The bearing assembly 13 under test is located inside the tensioning sleeve 193, and adjacent to the tensioning sleeve 193 are arranged the bearing assembly outer ring 26, the angular contact ball bearing 22, and the bearing assembly outer ring 27 in sequence. Lubricating oil is filled between the inner ring and the outer ring of the bearing assembly. The oil film capacitance of the lubricating oil film 28 is measured, and then converted to obtain the oil film thickness. The tensioning sleeve 193 is a high-concentricity tensioning sleeve, with a fit dimensional accuracy requirement of h7 = -7 microns to the shaft and H7 = +7 microns to the hole. After assembly, the runout of the tensioning sleeve does not exceed 5 microns, ensuring measurement accuracy. The slip ring 141, slip ring sleeve 192, and tensioning sleeve 193 are all coaxially arranged with the bearing assembly 13 under test, meeting the measurement system's requirements for stability and reliable measurement.

[0076] In some optional embodiments, the measurement system also includes a control panel, which is mounted on the integrated control module and displays various data from the temperature measurement module, speed measurement module, and oil film testing module for easy operation. The integrated control module contains testing software that combines TIA Portal and LabVIEW (Laboratory Virtual Instrument Engineering Workbench, a graphical programming language development environment). TIA Portal processes the various sensor signals acquired by the programmable logic controller (PLC), while LabVIEW performs display and control functions through the control panel.

[0077] As one or more specific application embodiments of the present invention, the influence of the operating conditions for measuring the oil film thickness of the bearing assembly on the lubrication state of the control torque gyroscope bearing assembly includes measuring the vacuum level, rotational speed, and temperature of the environment in which the bearing assembly is located, as well as the axial preload and oil filling amount of the bearing assembly itself. The measurement conditions for axial preload and oil filling amount are achieved by adjusting the control torque gyroscope bearing assembly, while the vacuum level, rotational speed, and temperature condition measurement system provides the control torque gyroscope bearing assembly.

[0078] Vacuum measurement requires the use of an integrated control module to control the opening and closing of a vacuum valve, which in turn controls the working state of the vacuum pump, so that the bearing assembly under test can be in a vacuum environment. The vacuum level of the vacuum chamber is set to 5-10 Pa to meet the vacuum environment requirements for measurement.

[0079] The parameters of the LCR meter used in the oil film capacitance tester are shown in Table 1:

[0080] Table 1 LCR Tester Parameter Range

[0081]

[0082] The first PID control unit of the integrated control module can control the temperature measurement module to ensure that the measurement environment reaches the preset temperature, so that the measurement temperature can reach the required temperature of 60℃.

[0083] The second PID control unit of the integrated control module can control the speed measurement module so that the speed of the bearing assembly under test is between 0 and 3000 r / min, with a maximum speed of 3000 r / min.

[0084] The final measurement conditions are shown in Table 2 below:

[0085] Table 2 Measurement parameters under different working conditions

[0086]

[0087] When the above measurement conditions are met, the oil film thickness and stability change with rotational speed as shown in the figure below. Figure 7 As shown, from Figure 7 It can be seen that the oil film thickness measured using the measurement system of this invention is basically consistent with the theoretical oil film thickness. The curves showing the variation of bearing assembly oil film thickness with rotational speed under different temperature and vacuum conditions are shown below. Figure 8 As shown, from Figure 8 It can be seen that the optimal lubrication conditions for the B7004C angular contact ball bearing in the control torque gyroscope bearing assembly were obtained based on the curves showing the change in oil film thickness of the bearing assembly with rotational speed under different temperature conditions.

[0088] The bearing assembly oil film thickness measurement system provided in this invention achieves the measurement of the oil film thickness of the bearing assembly under test in a vacuum environment by setting up a vacuum test environment. By controlling the temperature and rotation speed of the measurement system, the system realizes the measurement curve of the oil film thickness of the bearing assembly under vacuum conditions as a function of rotation speed under different temperature conditions. This solves the problem that the existing technology cannot meet the requirements for measuring the oil film thickness of the control moment gyroscope bearing assembly under vacuum conditions, and it is difficult to achieve the measurement of the oil film thickness of the control moment gyroscope bearing assembly.

[0089] This embodiment provides a method for measuring the oil film thickness of a bearing assembly. Figure 9 This is a flowchart of a bearing assembly oil film thickness measurement method according to an embodiment of the present invention, such as... Figure 9 As shown, the process includes the following steps:

[0090] Step S101: Place the bearing assembly to be tested in a vacuum environment. Specifically, the integrated control module in the measurement system controls the opening and closing of the vacuum valve, and then controls the vacuum pump to evacuate the sealed space formed between the cylinder and the base, so that the bearing assembly to be tested can be in a vacuum environment.

[0091] Step S102: Acquire temperature data of the vacuum environment and rotational speed data of the bearing assembly under test. Specifically, the temperature data of the vacuum chamber is acquired by measuring the temperature of the vacuum chamber through the thermistor sensor in the temperature measurement module, and the temperature data is transmitted to the first PID control unit of the integrated control module. The first PID control unit compares the temperature data with a first preset value, for example, the first preset value is set to 60°C. When the temperature data does not reach 60°C, the first PID control unit sends a control signal to the heating plate in the temperature measurement module to make the heating plate work to raise the temperature of the vacuum chamber until the temperature of the vacuum chamber rises to 60°C and the heating plate stops working. When the temperature data exceeds 60°C, the first PID control unit sends a control signal to the thermoelectric cooler to make the thermoelectric cooler work to lower the temperature of the vacuum chamber until the temperature of the vacuum chamber drops to 60°C and the thermoelectric cooler stops working. The rotational speed of the bearing assembly under test is measured by the motor speed sensor in the rotational speed measurement module. The rotational speed data is then transmitted to the second PID control unit of the integrated control module. The second PID control unit converts the rotational speed data into voltage data and compares the voltage data with a second preset value. When the voltage data is lower than the second preset value, the second PID control unit controls the output voltage to increase, thereby increasing the rotational speed of the bearing assembly under test. Conversely, when the voltage data is higher than the second preset value, the second PID control unit controls the output voltage to decrease, thereby decreasing the rotational speed of the bearing assembly under test.

[0092] Step S103: When the temperature data equals the first preset value and the rotational speed data equals the second preset value, the oil film capacitance value of the bearing assembly is obtained. Specifically, the oil film capacitance value of the bearing assembly is measured by the oil film capacitance tester only when the set temperature data equals the first preset value and the rotational speed data equals the second preset value, satisfying the set temperature and rotational speed measurement conditions. Otherwise, when the measurement conditions are not met, the integrated control module adjusts the temperature measurement module and the rotational speed measurement module to meet the measurement conditions.

[0093] Step S103: Calculate the oil film thickness of the bearing assembly under test based on the oil film capacitance value. Specifically, the oil film capacitance value of the bearing assembly under test is measured using an oil film capacitance tester in the oil film testing module, and the oil film capacitance value is transmitted to the integrated control module. The integrated control module calculates the oil film thickness based on the oil film capacitance value, using the following formula:

[0094]

[0095] Where: C is the measured value of oil film capacitance, ε0 is the vacuum dielectric constant, and ε r Where S is the relative permittivity, S is the contact area between the B7004C angular contact ball bearing and the inner ring of the bearing assembly, and d is the oil film thickness. Based on this calculation formula, the measured oil film capacitance can be converted into oil film thickness.

[0096] This embodiment also provides a bearing assembly oil film thickness measuring device, which is used to implement the above embodiments and preferred embodiments; details already described will not be repeated. As used below, the term "module" can refer to a combination of software and / or hardware that performs a predetermined function. Although the device described in the following embodiments is preferably implemented in software, hardware implementation, or a combination of software and hardware, is also possible and contemplated.

[0097] This embodiment provides a bearing assembly oil film thickness measuring device, such as... Figure 10 As shown, it includes:

[0098] Vacuum operation module 501 is used to place the bearing assembly under test in a vacuum environment;

[0099] The first acquisition module 502 is used to acquire temperature data of the vacuum environment and rotational speed data of the bearing assembly under test;

[0100] The second acquisition module 503 is used to acquire the oil film capacitance value of the measuring bearing assembly when the temperature data is equal to the first preset value and the rotation speed data is equal to the second preset value.

[0101] The calculation module 504 is used to calculate the oil film thickness of the bearing assembly based on the oil film capacitance value.

[0102] In this embodiment, the bearing assembly oil film thickness measuring device is presented in the form of a functional unit. Here, a unit refers to an ASIC circuit, a processor and memory that execute one or more software or fixed programs, and / or other devices that can provide the above functions.

[0103] Further functional descriptions of the above modules are the same as those in the corresponding embodiments described above, and will not be repeated here.

[0104] This invention also provides a computer device having the above-described features. Figure 10 The bearing assembly oil film thickness measuring device shown.

[0105] Please see Figure 11 , Figure 11 This is a schematic diagram of the structure of a computer device provided in an optional embodiment of the present invention, such as... Figure 11As shown, the computer device includes one or more processors 10, memory 20, and interfaces for connecting the components, including high-speed interfaces and low-speed interfaces. The components communicate with each other via different buses and can be mounted on a common motherboard or otherwise installed as needed. The processors can process instructions executed within the computer device, including instructions stored in or on memory to display graphical information of a GUI on external input / output devices (such as display devices coupled to the interfaces). In some alternative implementations, multiple processors and / or multiple buses can be used with multiple memories and multiple memory modules, if desired. Similarly, multiple computer devices can be connected, each providing some of the necessary operations (e.g., as a server array, a group of blade servers, or a multiprocessor system). Figure 11 Take a processor 10 as an example.

[0106] Processor 10 may be a central processing unit, a network processor, or a combination thereof. Processor 10 may further include a hardware chip. The hardware chip may be an application-specific integrated circuit (ASIC), a programmable logic device (PLD), or a combination thereof. The programmable logic device may be a complex programmable logic device (CAMP), a field-programmable gate array (FPGA), a general-purpose array logic (GDA), or any combination thereof.

[0107] The memory 20 stores instructions executable by at least one processor 10 to cause the at least one processor 10 to perform the method shown in the above embodiments.

[0108] The memory 20 may include a program storage area and a data storage area. The program storage area may store the operating system and applications required for at least one function; the data storage area may store data created based on the use of the computer device as shown by a landing page for an app. Furthermore, the memory 20 may include high-speed random access memory and may also include non-transitory memory, such as at least one disk storage device, flash memory device, or other non-transitory solid-state storage device. In some alternative embodiments, the memory 20 may optionally include memory remotely located relative to the processor 10, which can be connected to the computer device via a network. Examples of such networks include, but are not limited to, the Internet, intranets, local area networks, mobile communication networks, and combinations thereof.

[0109] Memory 20 may include volatile memory, such as random access memory; memory may also include non-volatile memory, such as flash memory, hard disk or solid-state drive; memory 604 may also include combinations of the above types of memory.

[0110] The computer device also includes a communication interface 30 for communicating with other devices or communication networks.

[0111] This invention also provides a computer-readable storage medium. The methods described above according to embodiments of the invention can be implemented in hardware or firmware, or implemented as computer code that can be recorded on a storage medium, or implemented as computer code downloaded via a network and originally stored on a remote storage medium or a non-transitory machine-readable storage medium and then stored on a local storage medium. Thus, the methods described herein can be processed by software stored on a storage medium using a general-purpose computer, a dedicated processor, or programmable or dedicated hardware. The storage medium can be a magnetic disk, optical disk, read-only memory, random access memory, flash memory, hard disk, or solid-state drive, etc.; further, the storage medium can also include combinations of the above types of memory. It is understood that computers, processors, microprocessor controllers, or programmable hardware include storage components capable of storing or receiving software or computer code, which, when accessed and executed by the computer, processor, or hardware, implements the methods shown in the above embodiments.

[0112] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A bearing assembly oil film thickness measurement system, characterized in that, The system includes a base, a cylinder, an oil film testing module, and an integrated control module; The cylindrical body is mounted on the base, forming a vacuum chamber between the cylindrical body and the base, and the bearing assembly to be tested is placed in the vacuum chamber; The oil film testing module includes a slip ring and an oil film capacitance tester. The slip ring is disposed in the vacuum chamber and connected to the bearing assembly under test. The slip ring is connected to the oil film capacitance tester disposed outside the vacuum chamber via an electrical connector. The oil film capacitance tester is used to measure the oil film capacitance value of the bearing assembly under test. The integrated control module is used to convert the oil film thickness based on the oil film capacitance value; It also includes a slip ring support module, which includes a slip ring bracket, a slip ring sleeve, and a tensioning sleeve. The slip ring bracket is mounted on the base, one end of the slip ring is fixedly mounted on the slip ring bracket, the slip ring sleeve is mounted on the other end of the slip ring, and the tensioning sleeve is mounted between the slip ring sleeve and the bearing assembly under test. The slip ring, slip ring sleeve, and tensioning sleeve are all coaxially arranged with the bearing assembly under test.

2. The system according to claim 1, characterized in that, The cylinder is formed by welding flanges to seamless steel pipes. The upper end of the cylinder is sealed by a vacuum chamber cover consisting of a first sealing gasket and an observation window. The lower end is fixedly connected by bolts and a second sealing gasket and then installed on the base, forming a sealed vacuum chamber with the base.

3. The system according to claim 2, characterized in that, Also includes: A vacuum module, comprising a vacuum pump, a vacuum valve, a vacuum sensor, and a vacuum gauge; The base is provided with multiple openings for mounting multiple quick-connect couplings, including a first quick-connect coupling and a second quick-connect coupling; the vacuum valve is connected to the first quick-connect coupling via a vacuum line, and the vacuum valve is connected to the vacuum pump; the vacuum sensor is connected to the second quick-connect coupling via a vacuum line; the vacuum gauge is connected to both the vacuum sensor and the integrated control module. The vacuum valve is used to turn the vacuum pump on or off to perform vacuuming operations; the vacuum sensor is used to measure the air pressure value of the vacuum chamber and transmit the air pressure value to the vacuum gauge; the vacuum gauge is used to display the air pressure value and transmit the air pressure value to the integrated control module, which is used to adjust the opening or closing of the vacuum valve according to the air pressure value.

4. The system according to claim 1, characterized in that, Also includes: A temperature measurement module is installed in the vacuum chamber, and the temperature measurement module includes a resistance temperature sensor, a heating plate, and a semiconductor refrigeration chip. The thermal resistance sensor, heating plate, and semiconductor refrigeration chip are all led out of the vacuum chamber and connected to the integrated control module via electrical connector wires. The resistance temperature sensor is used to detect the temperature of the vacuum chamber and transmit the temperature data to the integrated control module. The integrated control module is used to control the heating plate to heat the vacuum chamber or the semiconductor cooling chip to cool the vacuum chamber according to the relationship between the temperature data and the first preset value.

5. The system according to claim 1, characterized in that, Also includes: A rotational speed measurement module is installed in the vacuum chamber, and the rotational speed measurement module includes a motor and a drive unit. The drive unit is used to drive the motor to work; The motor is coaxially arranged with the bearing assembly under test; The motor is equipped with a speed sensor, which is used to measure the rotational speed of the bearing assembly under test and transmit the rotational speed to the integrated control module. The integrated control module is used to convert the rotational speed into voltage data, and control the motor to adjust the rotational speed of the bearing assembly under test according to the relationship between the voltage data and a second preset value.

6. A method for measuring the oil film thickness of a bearing assembly, characterized in that, The method, applied to the bearing assembly oil film thickness measurement system as described in claims 1-5, comprises: Place the bearing assembly to be tested in a vacuum environment; Acquire the temperature data of the vacuum environment and the rotational speed data of the bearing assembly under test; When the temperature data equals a first preset value and the rotational speed data equals a second preset value, the oil film capacitance value of the measuring bearing assembly is obtained; The oil film thickness of the bearing assembly under test is calculated based on the oil film capacitance value.

7. A bearing assembly oil film thickness measuring device, characterized in that, The device, applied to the bearing assembly oil film thickness measurement system as described in claims 1-5, comprises: Vacuum operation module, used to place the bearing assembly under test in a vacuum environment; The first acquisition module is used to acquire the temperature data of the vacuum environment and the rotational speed data of the bearing assembly under test; The second acquisition module is used to acquire the oil film capacitance value of the measuring bearing assembly when the temperature data is equal to the first preset value and the rotation speed data is equal to the second preset value. The calculation module is used to calculate the oil film thickness of the bearing assembly based on the oil film capacitance value.

8. A computer device, characterized in that, include: The system includes a memory and a processor, which are interconnected. The memory stores computer instructions, and the processor executes the computer instructions to perform the bearing assembly oil film thickness measurement method of claim 6.

9. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions for causing a computer to execute the bearing assembly oil film thickness measurement method of claim 6.

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