CN115406551A - Bearing inner race temperature monitoring device of wireless power supply - Google Patents
Bearing inner race temperature monitoring device of wireless power supply Download PDFInfo
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- CN115406551A CN115406551A CN202211019361.1A CN202211019361A CN115406551A CN 115406551 A CN115406551 A CN 115406551A CN 202211019361 A CN202211019361 A CN 202211019361A CN 115406551 A CN115406551 A CN 115406551A
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- module
- power supply
- wireless power
- bearing inner
- temperature
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/02—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using thermoelectric elements, e.g. thermocouples
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
- G01K1/14—Supports; Fastening devices; Arrangements for mounting thermometers in particular locations
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/16—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
- G01K7/22—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a non-linear resistance, e.g. thermistor
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/005—Mechanical details of housing or structure aiming to accommodate the power transfer means, e.g. mechanical integration of coils, antennas or transducers into emitting or receiving devices
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/70—Circuit arrangements or systems for wireless supply or distribution of electric power involving the reduction of electric, magnetic or electromagnetic leakage fields
Abstract
The invention discloses a bearing inner ring temperature monitoring device with wireless power supply, which comprises: slewing mechanism and static mechanism, slewing mechanism includes: the hollow shaft is installed in a bearing inner ring to be tested, a through hole is formed in the side wall of the hollow shaft, the temperature sensor is arranged in the through hole and is in contact with the bearing inner ring, the temperature measuring module is connected with the temperature sensor and the wireless data transmitting module respectively, and the wireless power supply receiving module is connected with the temperature measuring module and the wireless data transmitting module respectively; the stationary mechanism includes: the wireless power supply device comprises a support module, a wireless power supply transmitting module and a wireless data receiving module, wherein the wireless power supply transmitting module and the wireless data receiving module are arranged in the support module; the supporting module is installed on the bearing seat, the wireless power supply transmitting module is electrically connected with the external power supply and the wireless data receiving module, electric energy input by the external power supply is transmitted to the wireless power supply receiving module, and the wireless data receiving module is connected with the upper computer.
Description
Technical Field
The invention belongs to the technical field of real-time measurement of bearing temperature, and relates to a wireless power supply bearing inner ring temperature monitoring device.
Background
The temperature of the bearing is increased due to rolling and/or sliding friction of the rolling bodies and the inner and outer ring runways of the bearing in the service process of the whole service life. The change of the bearing temperature can reflect whether the bearing is in a good lubrication state on one hand, and can indirectly reflect the contact damage degree and the rotation precision of the surface of the bearing material on the other hand. In the stage of rolling contact fatigue failure of the bearing, the temperature of the bearing is obviously increased at the same time. Therefore, online real-time detection for the temperature of the bearing is important for service safety and stability evaluation of the bearing.
At present, the conventional method for monitoring the temperature of the bearing is to punch a hole in a bearing seat and arrange a thermocouple, and directly measure the temperature of an outer ring of the bearing, as the overall temperature change trend of the bearing. However, the temperature measuring point of the outer ring of the bearing is far away from the rolling contact area, so that the temperature measurement has obvious hysteresis, and the influence of the bearing on the temperature of the bearing due to the service working conditions of the bearing such as load and rotating speed and the like and the state changes such as oil film continuity, surface damage, fatigue peeling and the like cannot be rapidly measured. Furthermore, the heat accumulation generated in the rolling contact area of the bearing is mainly concentrated in the vicinity of the contact area of the rolling elements, the inner ring, and the cage, so that the outer ring temperature is always lower than the contact area. Only with bearing inner race collection temperature as the control foundation, often can bring the misjudgement of bearing service state, bring irreversible damage to the bearing. Particularly, for a high-speed ceramic ball bearing adopting a high polymer material to process a retainer, when the collection temperature at the outer ring of the high-speed ceramic ball bearing is close to the service limit temperature (70 ℃) of the retainer material, the temperature of the rolling contact area is far higher than the temperature value, and the retainer is easy to break, so that the bearing fails.
In order to realize rapid and accurate monitoring of the service temperature of the bearing, in U.S. patent "Wireless sensor for rotating elements (US 9528885 B2)" of Lokesh and the like, permanent magnetic materials such as NdFeB or AlNiCo and the like are arranged on the surfaces of rotating parts such as the end surface of the inner ring of the bearing and the like, the magnetic field intensity change of the permanent magnetic materials generated along with the temperature is measured through a hall sensor, and the temperature value of the inner ring is obtained through derivation and conversion. However, the detection accuracy of the magnetic field change is affected by the bearing and other ferromagnetic materials in the structure, and the accuracy of temperature calculation is reduced. In addition, the arrangement of the permanent magnet material on the bearing inner ring can also change the bearing structure to a certain extent, and the service life of the bearing is influenced. Similarly, scott et al, IEEE SENSORS, published as "An interferometric-Robust 300 ℃ MEMS Temperature Sensor for Wireless Health Monitoring of Ball and Rolling Element Bearings" uses a micro-machining (MEMS) method to prepare a Temperature telemetry Sensor integrated within a bearing cage to measure bearing Temperature. The embedded mounting of the sensor can also have a detrimental effect on the bearing structure.
In order to realize the nondestructive monitoring of the temperature of the bearing inner ring, yan Ke and other Chinese invention patents (CN 105627074B) disclose a device and a method for adjusting the lubricating state of a bearing by monitoring the temperature of the inner ring, and the temperature information of a bearing rotating body is obtained by utilizing the fluorescence spectrum characteristics of a polyelectrolyte-CdTe quantum dot composite film temperature sensor prepared on the surface of the bearing inner ring under the excitation of laser. And then the flow of the bearing lubricating oil is adjusted according to the temperature change, and the regulation and control of the lubricating state and the service temperature of the bearing are realized. On one hand, however, calibration of the quantum dot film sensor is complex, and the film and the bearing steel interface are weak to be combined and are easy to fall off; on the other hand, because the method belongs to non-contact measurement, the lubricating oil sprayed in the service process of the bearing can shield the laser beam, and the accuracy and the stability of the temperature information acquisition of the quantum dot film temperature sensor are influenced.
The invention patent of China of Wangzheng Zhenghui et al (CN 109855745A) discloses an aviation bearing inner ring temperature test device and a test method, wherein a thermocouple is directly installed on a transmission shaft in a contact manner by designing a groove on the surface of the bearing installation transmission shaft, and the thermocouple is contacted with the inner surface of a bearing inner ring to collect temperature. And sending the temperature data acquired by the thermocouple to an upper computer in a wireless data transmission mode. The bearing inner ring temperature measuring device is directly and integrally installed with the shaft, and a lithium battery is adopted to supply power for the temperature measuring device with wireless data transmission. The problem that the temperature of the rotating bearing inner ring cannot be tested through signal wired transmission is successfully solved, and the structural integrity of the bearing is not affected. However, the thermocouple is installed in the groove on the surface of the transmission shaft, and the wiring mode of the thermocouple wire is not protected, so that the thermocouple wire is exposed to the service working conditions of the bearing and the transmission shaft, the data transmission stability of the wire is influenced, and the service life of the temperature testing device is shortened. The chinese utility model patent "a bearing inner race temperature real-time measurement device (CN 204730956U)" of mamingming et al discloses a wireless signal transmission temperature measuring device by lithium cell power supply at axle internally mounted, and the thermocouple is installed in the blind hole of bearing installation axle, and indirect temperature conduction through the axle is measured the bearing inner race temperature. Temperature measuring device embedding leads to wireless data signal to transmit comparatively difficultly in the inside of bearing installation axle, need additionally design the through-hole on the bearing installation axle and be used for signal transmission, influences installation axle global rigidity. In addition, on one hand, in the lithium battery power supply mode adopted in the two patents, the lithium battery power supply has the problems that the dynamic balance of a rotating part is influenced due to the overlarge battery size, the wireless temperature measuring device cannot continuously work for a long time due to the limitation of the battery power and the like. For the service bearing with higher temperature working condition, such as an aircraft engine bearing, the temperature of the lubricating oil can reach 60-150 ℃. The lithium battery is difficult to bear the high temperature, so that the wireless transmission temperature measuring device cannot work. On the other hand, signal interference is strong in the complex electromagnetic environment of the industrial field, and wireless transmission of temperature analog or digital signals can be influenced to a certain extent. None of the above publications address the special signal shielding design for wireless signal transmission.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a bearing inner ring temperature monitoring device with wireless power supply, which can realize the long-time online monitoring of the temperature of a bearing inner ring rapidly and accurately on the premise of no damage to a bearing structure and has an electromagnetic interference shielding function.
The invention provides a bearing inner race temperature monitoring device with wireless power supply, which comprises: a rotating mechanism and a stationary mechanism, the rotating mechanism comprising: the hollow shaft is arranged in a bearing inner ring to be detected, a through hole is formed in the side wall of the hollow shaft, the temperature sensor is arranged in the through hole and is in contact with the bearing inner ring, the temperature measuring module is respectively and electrically connected with the temperature sensor and the wireless data transmitting module, and the wireless power supply receiving module is respectively and electrically connected with the temperature measuring module and the wireless data transmitting module;
the stationary mechanism includes: the wireless power supply device comprises a supporting module, a wireless power supply transmitting module and a wireless data receiving module; the supporting module is arranged on the bearing seat, and the wireless power supply transmitting module and the wireless data receiving module are arranged in the supporting module; the wireless power supply transmitting module is electrically connected with an external power supply and the wireless data receiving module and transmits electric energy input by the external power supply to the wireless power supply receiving module, and the wireless data receiving module is connected with an upper computer.
In the wirelessly powered bearing inner ring temperature monitoring device, one end of the hollow shaft is a cantilever end, and the other end of the hollow shaft is a connecting end; the wireless power supply receiving module, the temperature measuring module and the wireless data transmitting module are integrally integrated on the first circuit board and are fixedly mounted at the cantilever end of the hollow shaft through bolts after being subjected to polymer reinforced packaging.
In the wirelessly-powered bearing inner ring temperature monitoring device, the connecting end of the hollow shaft is a spline or a flexible rope coupler which is connected with a driving motor to drive a bearing to be tested to rotate.
In the wirelessly powered bearing inner ring temperature monitoring device, the wireless power supply receiving module receives the electric energy transmitted by the wireless power supply transmitting module and converts the electric energy into 1.5-5.0V voltage; the receiving coil of the wireless power supply receiving module is an annular coil, and the bundling number is 20-50.
In the wirelessly-powered bearing inner ring temperature monitoring device, the model of a temperature measuring chip in a temperature measuring module is MAX31855K, and a temperature sensor is a platinum resistor or a thermocouple.
In the wirelessly powered bearing inner ring temperature monitoring device, the wireless data transmitting module is a CH571 chip, and transmits temperature data to the wireless data receiving module in a Bluetooth or Zigbee communication mode.
In the wirelessly powered bearing inner ring temperature monitoring device, the wirelessly powered transmitting module and the wirelessly powered data receiving module are integrated on the second circuit board, and are installed in the supporting module after being encapsulated by polymer reinforcement.
In the wirelessly-powered bearing inner ring temperature monitoring device, the whole supporting module is of a cylindrical structure, one end of the cylindrical structure is closed, the opening at the other end of the cylindrical structure extends outwards to form a flange, the flange is fixed on the bearing seat through a bolt, and the supporting module is arranged on one side, close to the cantilever end, of the bearing seat; the second circuit board is arranged at one end of the horizontal rod, and the other end of the second circuit board penetrates through the mounting hole of the vertical column and is fixed through a bolt.
In the wirelessly powered bearing inner ring temperature monitoring device, the supporting module of the cylinder structure is made of metal materials to shield the electromagnetic signal interference of other environments.
In the bearing inner ring temperature monitoring device with wireless power supply, the input voltage of the wireless power supply transmitting module is 10-24V, the transmitting coil of the wireless power supply transmitting module is of an annular structure, and the bundling number is 80-150; the wireless data receiving module is a CH571 chip.
The bearing inner ring temperature monitoring device with wireless power supply at least has the following beneficial effects:
the temperature monitoring device adopts a wireless power supply mode without a built-in battery, and the influence of the device on the dynamic balance of the bearing is reduced. Meanwhile, the long-time stable direct measurement of the temperature of the bearing inner ring is realized on the premise of not influencing the structural integrity of the bearing. In the temperature measuring process, the circuit and the lead are not influenced by lubricating oil or lubricating grease and the like, and the temperature rise and the service state of the bearing can be quickly and accurately reflected. The temperature monitoring device adopts a special electromagnetic shielding structure design, so that the wireless temperature signal is not influenced by the complex electromagnetic environment under the external working condition.
Drawings
FIG. 1 is a schematic structural diagram of a wirelessly powered bearing inner race temperature monitoring device of the present invention;
the device comprises a hollow shaft 1, a wireless power supply receiving module 2, a receiving coil 3, a temperature measuring module 4, a wireless data transmitting module 5, a temperature sensor 6, a bearing to be tested 7, a bearing seat 8, a wireless power supply transmitting module 9, a transmitting coil 10, a wireless data receiving module 11, a support module 12, a horizontal push rod 13, a vertical column 14, an external power supply 15 and an upper computer 16.
Detailed Description
As shown in fig. 1, the wirelessly powered bearing inner race temperature monitoring device of the present invention is characterized by a rotating mechanism and a stationary mechanism, wherein the rotating mechanism comprises: hollow shaft 1 and temperature sensor 6, wireless power supply receiving module 2, temperature measurement module 4 and the wireless data transmitting module 5 of setting in hollow shaft 1, hollow shaft 1 is installed in the inner circle of the bearing 7 that awaits measuring, is equipped with the through-hole on the lateral wall of hollow shaft 1, temperature sensor 6 sets up in the through-hole and with the contact of bearing inner circle, temperature measurement module 4 is connected with temperature sensor 6 and wireless data transmitting module 5 electricity respectively, wireless power supply receiving module 2 is connected with temperature measurement module 4 and wireless data transmitting module 5 electricity respectively.
The stationary mechanism includes: a support module 12, a wireless power supply transmitting module 9 and a wireless data receiving module 11. The support module 12 is installed on the bearing seat 8, and the wireless power supply transmitting module 9 and the wireless data receiving module 11 are installed in the support module 12. The wireless power supply transmitting module 9 is electrically connected with an external power supply 15 and the wireless data receiving module 11, electric energy input by the external power supply 15 is transmitted to the wireless power supply receiving module 2, and the wireless data receiving module 2 is connected with the upper computer 16.
One end of the hollow shaft is a cantilever end, and the other end of the hollow shaft is a connecting end. The wireless power supply receiving module 2, the temperature measuring module 4 and the wireless data transmitting module 5 are integrally integrated on the first circuit board, and are fixedly mounted at the cantilever end of the hollow shaft 1 through bolts after being packaged in a polymer reinforced mode. The connecting end of the hollow shaft 1 is a spline or a flexible rope coupler which is connected with a driving motor to drive the bearing to be tested to rotate at a high speed.
In specific implementation, the wireless power supply receiving module 2 receives the electric energy transmitted by the wireless power supply transmitting module 9 and converts the electric energy into 1.5-5.0V voltage to supply power for the temperature measuring module 4 and the wireless data transmitting module 5. The receiving coil 3 of the wireless power supply receiving module 2 is a ring coil, and the number of bundles is 20-50. The model of the temperature measuring chip in the temperature measuring module 4 is preferably MAX31855K, the temperature sensor 6 can adopt a platinum resistor or a thermocouple, the temperature measuring range is 0-1000 ℃, and specifically one or more temperature sensors 6 can be adopted. The wire of the temperature sensor 6 is arranged inside the hollow shaft 1 and connected to the temperature measuring module 4, so that the temperature sensor is not exposed to the service working condition of the bearing, does not contact with lubricating oil, and is stable in data transmission. The wireless data transmitting module 5 preferably uses a CH571 chip, and transmits the temperature data to the wireless data receiving module 11 by using a bluetooth or Zigbee communication mode.
The wireless power supply transmitting module 9 and the wireless data receiving module 11 are integrated on the second circuit board, and are installed in the supporting module 12 after being encapsulated by polymer reinforcement. The whole supporting module 11 is of a cylinder structure, one end of the cylinder structure is closed, the opening of the other end of the cylinder structure extends outwards to form a flange, the flange is fixed on the bearing block 8 through a bolt, and the supporting module 11 is installed on one side, close to the cantilever end, of the bearing block. The cylindrical structure is internally provided with a push rod structure consisting of a horizontal push rod 13 and a vertical column 14, the vertical column 14 is fixed on the inner wall of the cylindrical structure, the top of the cylindrical structure is provided with a mounting hole, a second circuit board is mounted at one end of the horizontal rod 13, the other end of the horizontal rod 13 penetrates through the mounting hole of the vertical column 14 and is fixed through a bolt, and the horizontal rod 13 can adjust the distance between the first circuit board and the second circuit board in the range of 5-30 mm.
During specific implementation, the supporting module of the cylinder structure is made of metal materials so as to shield interference of other electromagnetic signals in the environment and ensure accurate transmission of temperature data. The input voltage of the wireless power supply transmitting module 9 is 10-24V, and electric energy is transmitted to the rotating mechanism in a wireless transmission mode, the transmitting coil 10 of the wireless power supply transmitting module 9 is of an annular structure, and the bundling number is 80-150; the wireless data receiving module 11 is a CH571 chip, and can transmit the temperature data to the upper computer 16 in a digital and/or analog signal wired manner, so as to realize real-time display and recording of the temperature data.
The above description is only a preferred embodiment of the present invention and should not be taken as limiting the scope of the invention, which is intended to cover any modifications, equivalents, improvements, etc. within the spirit and scope of the present invention.
Claims (10)
1. The utility model provides a bearing inner race temperature monitoring devices of wireless power supply which characterized in that includes: a rotation mechanism and a stationary mechanism, the rotation mechanism comprising: the hollow shaft is arranged in a bearing inner ring to be detected, a through hole is formed in the side wall of the hollow shaft, the temperature sensor is arranged in the through hole and is in contact with the bearing inner ring, the temperature measuring module is respectively and electrically connected with the temperature sensor and the wireless data transmitting module, and the wireless power supply receiving module is respectively and electrically connected with the temperature measuring module and the wireless data transmitting module;
the stationary mechanism includes: the wireless power supply device comprises a supporting module, a wireless power supply transmitting module and a wireless data receiving module; the supporting module is arranged on the bearing seat, and the wireless power supply transmitting module and the wireless data receiving module are arranged in the supporting module; the wireless power supply transmitting module is electrically connected with an external power supply and the wireless data receiving module and transmits electric energy input by the external power supply to the wireless power supply receiving module, and the wireless data receiving module is connected with an upper computer.
2. The wirelessly powered bearing inner race temperature monitoring device of claim 1, wherein one end of the hollow shaft is a cantilever end and the other end is a connection end; the wireless power supply receiving module, the temperature measuring module and the wireless data transmitting module are integrally integrated on the first circuit board and are fixedly mounted at the cantilever end of the hollow shaft through bolts after being subjected to polymer reinforced packaging.
3. The wirelessly powered bearing inner race temperature monitoring device of claim 2, characterized in that the connection end of the hollow shaft is a spline or a flexible rope coupling, which is connected with a driving motor to drive the bearing to be tested to rotate.
4. The wirelessly powered bearing inner race temperature monitoring device according to claim 1, characterized in that the wirelessly powered receiving module receives the electric energy transmitted by the wirelessly powered transmitting module and converts it into a voltage of 1.5-5.0V; the receiving coil of the wireless power supply receiving module is an annular coil, and the bundling number is 20-50.
5. The wirelessly powered bearing inner race temperature monitoring device of claim 1, characterized in that a temperature measuring chip in the temperature measuring module is of a type of MAX31855K, and the temperature sensor is a platinum resistor or a thermocouple.
6. The device for monitoring the temperature of the bearing inner ring with the wireless power supply according to claim 1, wherein the wireless data transmitting module is a CH571 chip and transmits temperature data to the wireless data receiving module by adopting a Bluetooth or Zigbee communication mode.
7. The wirelessly powered bearing inner race temperature monitoring device of claim 1, characterized in that the wirelessly powered transmitter module and the wirelessly powered data receiver module are integrated on the second circuit board, encapsulated in polymer reinforcement, and then installed in the support module.
8. The wirelessly powered bearing inner race temperature monitoring device according to claim 7, characterized in that the support module is of a cylindrical structure as a whole, one end of the cylindrical structure is closed, the opening at the other end extends outwards to form a flange, the flange is fixed on the bearing seat through a bolt, and the support module is installed on one side of the bearing seat close to the cantilever end; the second circuit board is arranged at one end of the horizontal rod, and the other end of the second circuit board penetrates through the mounting hole of the vertical column and is fixed through a bolt.
9. The wirelessly powered bearing inner race temperature monitoring device of claim 8, characterized in that the support module of the cylindrical structure is made of metal to shield the environment from electromagnetic signal interference.
10. The wirelessly powered bearing inner race temperature monitoring device according to claim 1, characterized in that the input voltage of the wirelessly powered transmitting module is 10-24V, the transmitting coil of the wirelessly powered transmitting module is of an annular structure, and the number of turns is 80-150; the wireless data receiving module is a CH571 chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211019361.1A CN115406551A (en) | 2022-08-24 | 2022-08-24 | Bearing inner race temperature monitoring device of wireless power supply |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211019361.1A CN115406551A (en) | 2022-08-24 | 2022-08-24 | Bearing inner race temperature monitoring device of wireless power supply |
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| CN115406551A true CN115406551A (en) | 2022-11-29 |
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| CN202211019361.1A Pending CN115406551A (en) | 2022-08-24 | 2022-08-24 | Bearing inner race temperature monitoring device of wireless power supply |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117168809A (en) * | 2023-08-04 | 2023-12-05 | 上海大学 | Gas turbine tilting pad sliding bearing data wireless acquisition system |
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2022
- 2022-08-24 CN CN202211019361.1A patent/CN115406551A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117168809A (en) * | 2023-08-04 | 2023-12-05 | 上海大学 | Gas turbine tilting pad sliding bearing data wireless acquisition system |
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