Method and system for monitoring stress of thrust pad of multi-point statically indeterminate structure and water-turbine generator set

Abstract

The invention discloses a thrust pad stress monitoring method and system of a multi-point statically indeterminate structure and a water-turbine generator set, and the method comprises the steps: S1, micro-displacement sensors are installed, specifically, the micro-displacement sensors are installed on a supporting pad one by one, and the axis of each thrust pad and the axis of the corresponding micro-displacement sensor are located on the same straight line; s2, synchronously acquiring real-time load displacement of each thrust pad when a rotor rotates to a certain position through all micro-displacement sensors during operation of the unit; s3, calculating the dynamic load displacement of each thrust pad according to the initial load displacement and the real-time load displacement; s4, judging whether poor balance exists according to the dynamic load displacement; when the balance degree is poor, an alarm is given out; otherwise, turning to S5; and S5, repeating the steps S2 to S5, and completing monitoring of each thrust pad. The problems that an existing water-turbine generator set cannot monitor the poor balance degree in real time in the operation process, and dynamic changes of loads on a thrust bearing of the set cannot be monitored in real time are solved.

Description

Technical Field

[0001] This application belongs to the field of monitoring technology, and in particular relates to a method, system and hydro-generator set for monitoring the force on a thrust bearing of a multi-point statically indeterminate structure. Background Technology

[0002] Hydropower is a clean and renewable energy source that utilizes the potential energy of water to provide a continuous power supply through hydro-turbine generator sets. The thrust bearing in the generator set is known as the heart of the hydro-turbine generator set. It not only bears the weight of the generator set rotor, but also bears the axial water thrust when the unit generates electricity. Its working performance and operating status are directly related to whether the unit operates safely and reliably.

[0003] Through research, the inventors discovered that the support structure of the thrust bearing of a hydro-generator unit varies depending on the unit configuration, including structures such as an elastic oil tank, support bolts, and multi-point support with spring bundles. Among these, the support bolts and the elastic oil tank offer considerable flexibility in their structural layout, providing conditions for the installation of sensors. Therefore, it is possible to effectively monitor the force on the unit's thrust bearing.

[0004] Spring bundle support is a multi-point support, and the support for the thrust bearing is a statically indeterminate structure. Although a single thrust bearing can achieve self-adjustment of force, the overall force adjustment of the unit's thrust bearing requires repeated startups and continuous operation. The position that needs adjustment is determined by monitoring the temperature deviation of the thrust bearing. After shutdown, the thrust bearing support structure at the corresponding position is adjusted accordingly to improve the balance of the thrust bearing and reduce the temperature deviation of the bearing. The adjustment process is time-consuming, labor-intensive, and the adjustment effect is not good.

[0005] Therefore, how to effectively monitor the force on the spring bundle thrust bearing of a hydro-generator unit is an urgent problem to be solved in order to achieve comprehensive and multi-angle monitoring during the rapid installation, maintenance and operation of the unit. Summary of the Invention

[0006] The purpose of this application is to overcome the problems of the prior art by disclosing a method, system and hydro-generator set for monitoring the force on a thrust bearing of a multi-point statically indeterminate structure, so as to solve the problems of long installation cycle and low installation accuracy of thrust bearings in existing hydro-generator sets, as well as the inability to monitor the poor balance in real time during operation and the inability to monitor the dynamic changes of load on the thrust bearing of the unit in real time.

[0007] On the one hand, the objective of this application is achieved through the following technical solution: A method for monitoring the stress on a thrust bearing with a multi-point statically indeterminate structure, the method comprising: S1: Micro-displacement sensor installation: Install micro-displacement sensors one by one on the thrust pad, with the axis of each thrust pad and the axis of the corresponding micro-displacement sensor on the same straight line. S2: During unit operation, the real-time load displacement of each thrust bearing is synchronously acquired by all micro-displacement sensors when the rotor rotates to a certain position; S3: Calculate the dynamic load displacement of each thrust bearing based on the initial load displacement and the real-time load displacement; S4: Determine whether there is a problem with the balance based on the dynamic load displacement; if there is a problem with the balance, issue an alarm; otherwise, proceed to S5; S5: Repeat S2 to S5 to complete the monitoring of each thrust bearing.

[0008] According to a preferred embodiment, step S1 includes: Mark the vertical position of the force support point of each thrust pad, and drill corresponding through holes at the projection position of the thrust pad, so that the center point of the through hole coincides with the center position of the center positioning guide column of the spring bundle below it. Install the positioning sleeve of the micro displacement sensor, and then install the micro displacement sensor on the thrust pad one by one, so that the axis of each thrust pad and the axis of the corresponding micro displacement sensor are on the same straight line.

[0009] According to a preferred embodiment, step S1 further includes: acquiring the measured displacement value of the corresponding micro-displacement sensor during the installation process of each micro-displacement sensor; when the corresponding measured displacement value is one-quarter ± 0.1 mm of the range of the micro-displacement sensor, fixing the micro-displacement sensor in place and reinstalling the thrust bearing.

[0010] According to a preferred embodiment, the step between step S1 and step S2 further includes adjusting each thrust bearing, including: S101: When the unit is not loaded, the measured displacement values ​​of all micro-displacement sensors are acquired synchronously to obtain the initial load displacement of each thrust bearing at the same time point when no load is applied. S102: When the unit is loaded with all loads, the measured displacement values ​​of all micro-displacement sensors are acquired synchronously to obtain the static load displacement of each thrust bearing at the same time point when the load is applied. S103: Calculate the static relative load displacement of each thrust bearing based on the initial load displacement and static load displacement, and calculate the average static load displacement. S104: Calculate the static displacement difference of each thrust bearing based on the static relative load displacement and the average static load displacement of each thrust bearing, and determine whether the static displacement difference is less than the design requirement value. If so, the adjustment is completed; otherwise, proceed to step S105. S105: Adjust the number of thrust bearing support spring bundles according to the static displacement difference, and repeat steps S101 to S104 until the static displacement difference of each thrust bearing is less than the design requirement value.

[0011] According to a preferred embodiment, in steps S101 and S102, detection is initiated by sending a synchronization signal to all micro-displacement sensors, thereby synchronously acquiring the position measurement values ​​of all micro-displacement sensors at the same time point.

[0012] According to a preferred embodiment, in step S103, the static load displacement calculation formula for each thrust bearing is as follows:

[0013] in, The static load displacement of the i-th thrust bearing when the unit is subjected to load. This represents the initial load displacement of the i-th thrust bearing when no load is applied. Let be the static relative load displacement of the i-th thrust bearing; The formula for calculating the mean static load displacement is: , where n is the number of thrust tiles.

[0014] According to a preferred embodiment, in step S3, the dynamic load displacement calculation formula for each thrust bearing is as follows:

[0015] in, Let i be the real-time load displacement of the i-th thrust bearing. This represents the initial load displacement of the i-th thrust bearing when it is unloaded. Let be the dynamic load displacement of the i-th thrust bearing.

[0016] On the other hand, this application also discloses: A thrust bearing stress monitoring system for a multi-point statically indeterminate structure, wherein the thrust bearing stress monitoring system uses the aforementioned thrust bearing stress monitoring method to complete the thrust bearing stress monitoring; The thrust bearing force monitoring system includes: a micro-displacement sensor, a sensor transmitter, a preamplifier, and a monitoring host; Each micro-displacement sensor is electrically connected to the sensor transmitter. The micro-displacement sensor detects the force changes on the turbine unit, converts these changes into physical changes, and then the sensor transmitter converts them into digital signals. The preamplifier is electrically connected to the sensor transmitter to acquire the output signal of the sensor transmitter in real time. The monitoring host is electrically connected to the preamplifier, performs data modeling on the data obtained from the preamplifier, and displays the processed data in a visual manner. It can also output data remotely via an RS485 communication interface.

[0017] According to a preferred embodiment, the probe of the micro-displacement sensor is directly opposite and in contact with the central guide post of the spring bundle to detect the initial load displacement of the corresponding micro-displacement sensor during installation, the static load displacement of the corresponding micro-displacement sensor under static stress, and the real-time load displacement of the corresponding micro-displacement sensor under dynamic stress.

[0018] On the other hand, this application also discloses: A hydro-turbine generator set, the hydro-turbine generator set including the aforementioned thrust bearing stress monitoring system.

[0019] The aforementioned main solution and its various further alternative solutions can be freely combined to form multiple solutions, all of which are solutions that can be adopted and are claimed in this application. Those skilled in the art, after understanding the solution of this application, will realize that there are many combinations based on the prior art and common general knowledge, all of which are technical solutions to be protected in this application, and will not be exhaustively listed here.

[0020] The beneficial effects of this application are: In this application, the micro-displacement sensor is fixedly installed as part of the hydro-generator unit, rather than being a temporary installation. This ensures the stability of the micro-displacement sensor installation, thereby reducing or avoiding the impact of stability on the static balance of the unit during installation. Each micro-displacement sensor is fixedly installed when its measured displacement value is one-quarter ± 0.1 mm of its range, leaving sufficient range margin for displacement when the unit is loaded with load. In this application, the micro-displacement sensor only needs to be installed and fixed once, without needing to be zeroed again. All measured displacement values ​​are automatically acquired without manual intervention, which greatly increases the overall installation efficiency of the hydro-generator unit and improves the installation accuracy.

[0021] This application's method achieves online monitoring of the dynamic load of the thrust bearing by monitoring the dynamic load displacement of the thrust bearing pad, and determines whether there is an imbalance problem based on the dynamic load displacement, thus enabling online monitoring and judgment of imbalance problems. The entire detection and calculation process requires no manual intervention. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of a hydro-generator unit; Figure 2 This is a schematic diagram of the installation structure of a micro-displacement sensor; Figure 3 This is a schematic diagram of the principle structure of a thrust bearing force monitoring system with a multi-point statically indeterminate structure. Figure 4 This is a schematic diagram of the preamplifier in a multi-point statically indeterminate thrust bearing force monitoring system. Figure 5 This is a schematic diagram of the main unit in a multi-point statically indeterminate thrust bearing stress monitoring system. Detailed Implementation

[0023] The following specific examples illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. This application can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this application. It should be noted that, unless otherwise specified, the following embodiments and features in the embodiments can be combined with each other.

[0024] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0025] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0026] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0027] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0028] Furthermore, it should be noted that unless otherwise specified in this application, the specific structures, connections, positions, power sources, etc. involved are all things that a person skilled in the art can know without creative effort based on the prior art.

[0029] Example 1 refer to Figure 1 and Figure 2 As shown in the figure, this embodiment discloses a method for monitoring the force on a thrust bearing of a multi-point statically indeterminate structure. The method for monitoring the force on a thrust bearing of a multi-point statically indeterminate structure includes the following steps.

[0030] Step S1: Micro-displacement sensor installation. Install micro-displacement sensors one by one on the thrust pad, ensuring that the axis of each thrust pad and the axis of the corresponding micro-displacement sensor are on the same straight line.

[0031] Preferably, step S1 includes: marking the vertical position of the force support point of each thrust pad, drilling corresponding through holes at the projection position of its support pad, and making the center point of the through hole coincide with the center position of the center positioning guide post of the spring bundle below it, installing the micro-displacement sensor installation positioning sleeve, and then installing the micro-displacement sensor one by one on the support pad, so that the axis of each thrust pad and the axis of the corresponding micro-displacement sensor are on the same straight line.

[0032] Furthermore, it also includes: acquiring the measured displacement value of the corresponding micro-displacement sensor during the installation process of each micro-displacement sensor; when the corresponding measured displacement value is one-quarter ± 0.1 mm of the range of the micro-displacement sensor, fixing the micro-displacement sensor in place and reinstalling the thrust bearing.

[0033] In this application, the micro-displacement sensor is fixedly installed as part of the hydro-generator unit, rather than being a temporary installation. This ensures the stability of the micro-displacement sensor installation, thereby reducing or avoiding the impact of stability on the static balance of the thrust bearing during installation. Each micro-displacement sensor is fixedly installed when its measured displacement value is one-quarter ± 0.1 mm of its range, leaving sufficient measurement margin for displacement after subsequent loading. In this application, the micro-displacement sensor only needs to be installed and fixed once, without the need to reinstall and zero it after each adjustment. All measured displacement values ​​are automatically acquired without the need for manual reading, which greatly increases the overall installation efficiency and accuracy of the hydro-generator unit.

[0034] Step S2: During unit operation, the real-time load displacement of each thrust bearing is synchronously acquired by all micro-displacement sensors when the rotor rotates to a certain position; Step S3: Calculate the dynamic load displacement of each thrust bearing based on the initial load displacement and the real-time load displacement.

[0035] Preferably, in step S3, the dynamic load displacement calculation formula for each thrust bearing is as follows:

[0036] in, Let i be the real-time load displacement of the i-th thrust bearing. This represents the initial load displacement of the i-th thrust bearing when it is unloaded. Let be the dynamic load displacement of the i-th thrust bearing.

[0037] Step S4: Determine whether there is a problem with the balance based on the dynamic load displacement; if there is a problem with the balance, issue an alarm; otherwise, proceed to S5; Step S5: Repeat S2 to S5 to complete the monitoring of each thrust bearing.

[0038] Preferably, between step S1 and step S2, an adjustment is made to each thrust bearing, including the following steps.

[0039] Step S101: When the unit is not loaded, the measured displacement values ​​of all micro-displacement sensors are acquired synchronously to obtain the initial load displacement of each thrust bearing at the same time point when no load is applied.

[0040] Step S102: When the unit is loaded with all loads, the measured displacement values ​​of all micro-displacement sensors are acquired synchronously to obtain the static load displacement of each thrust bearing at the same time point when the load is applied.

[0041] Preferably, in steps S101 and S102, detection is initiated by sending a synchronization signal to all micro-displacement sensors, thereby synchronously acquiring the position measurement values ​​of all micro-displacement sensors at the same time point.

[0042] Step S103: Calculate the static relative load displacement of each thrust bearing based on the initial load displacement and static load displacement, and calculate the average static load displacement.

[0043] Preferably, in step S103, the static load displacement calculation formula for each thrust bearing is as follows:

[0044] in, The static load displacement of the i-th thrust bearing when the unit is subjected to load. This represents the initial load displacement of the i-th thrust bearing when no load is applied. Let be the static relative load displacement of the i-th thrust bearing; The formula for calculating the mean static load displacement is: , where n is the number of thrust tiles.

[0045] Step S104: Calculate the static displacement difference of each thrust bearing based on the static relative load displacement and the average static load displacement of each thrust bearing, and determine whether the static displacement difference is less than the design requirement value. If it is, the adjustment is completed; otherwise, proceed to step S105.

[0046] Step S105: Adjust the number of lower support spring bundles of the thrust bearing according to the static displacement difference, and repeat steps S101 to S104 until the static displacement difference of each thrust bearing is less than the design requirement value.

[0047] Example 2 Based on Example 1, this example discloses a thrust bearing stress monitoring system for a multi-point statically indeterminate structure. The system employs the thrust bearing stress monitoring method described in Example 1 to monitor the thrust bearing stress. Applied to a turbine generator unit, the turbine generator unit includes a mirror plate, a drive unit, a thrust bearing assembly, a spring bundle component, and a base ring. The thrust bearing assembly and spring bundle component are both mounted on the base ring. When the mirror plate is stationary, it is in contact with the thrust bearing assembly, forming a static stress state. When the drive unit drives the mirror plate to rotate relative to the thrust bearing assembly, it exhibits a dynamic stress state with changing load.

[0048] refer to Figure 3 As shown, the thrust bearing force monitoring system of this application includes: a micro-displacement sensor, a sensor transmitter, a preamplifier, and a monitoring host.

[0049] Each micro-displacement sensor is electrically connected to the sensor transmitter. The micro-displacement sensor detects the force changes of the turbine unit, converts these changes into physical changes, and then the sensor transmitter converts them into digital signals. The preamplifier is electrically connected to the sensor transmitter to achieve real-time acquisition of the sensor transmitter's output signal. The monitoring host is electrically connected to the preamplifier to perform data model processing on the data acquired from the preamplifier and display the processed data in a visual manner. At the same time, it can also output data remotely through the RS485 communication interface.

[0050] Preferably, the micro-displacement sensor is an FS-45 / 25 pressure-resistant micro-displacement sensor. The micro-displacement sensor detects the force changes of the turbine unit, converts the changes into physical changes, and then converts them into digital signals by a sensor transmitter. The probe of the micro-displacement sensor is directly opposite and in contact with the central guide post of the spring bundle to detect the initial load displacement of the corresponding micro-displacement sensor during installation, the static load displacement of the corresponding micro-displacement sensor under static stress, and the real-time load displacement of the corresponding micro-displacement sensor under dynamic stress.

[0051] In the turbine unit, the thrust bearing assembly includes multiple thrust bearings, which are arranged sequentially at intervals and located at the bottom of the mirror plate. Each thrust bearing is equidistant from the center of the mirror plate. Therefore, there are also multiple micro-displacement sensors. The axes of the thrust bearings are perpendicular to the mirror plate. The thrust bearing support is located below the thrust bearings and perpendicular to the axes. The micro-displacement sensors are located on the thrust bearing support.

[0052] Preferably, refer to Figure 4 As shown, the preamplifier includes a channel communication module, a main control module, a time base module, and an optical fiber module. The channel communication module contains 24 independent communication circuits for communicating with sensors using independent point-to-point communication. The main control module contains an ARM high-speed microprocessor for controlling multi-channel real-time synchronous communication. The time base module contains a highly stable time base circuit for initiating synchronous measurements with the sensors electrically connected to the preamplifier, ensuring the time consistency of all monitoring results. The optical fiber module contains a single-mode optical fiber communication interface module for remote data transmission and receiving remote control commands from the preamplifier.

[0053] Preferably, refer to Figure 5 As shown, the monitoring host includes a main control and computing module, a human-machine interface module, a fiber optic communication module, and an RS485 communication module. The human-machine interface module includes a touch-screen LCD and mechanical buttons, allowing users to set relevant operating parameters of the monitoring host on-site according to actual conditions, and displaying monitoring results in real time using numbers, graphics, or curves. The fiber optic communication module uses single-mode fiber optic communication to achieve a reliable remote connection with the front-end amplifier. The RS485 communication module is used for data uploading from the monitoring host. The main control and computing module is used for data model processing of the synchronously acquired initial load displacement, static load displacement, and real-time load displacement. The monitoring host also has a pre-stored displacement range; when the displacement value of the micro-displacement sensor is outside the preset range, the monitoring host will issue an alarm through the human-machine interface module.

[0054] Example 3 Based on Example 2, this example also discloses a hydro-generator set, which includes the thrust bearing force monitoring system described in Example 2.

[0055] The micro-displacement sensors in this application are fixedly installed as part of the hydro-generator unit, rather than being temporary installations. This ensures the stability of the micro-displacement sensor installation, thereby reducing or avoiding the impact of stability on the static balance of the unit during installation. Each micro-displacement sensor is fixedly installed when its measured displacement value is one-quarter ± 0.1 mm of its range, leaving sufficient range margin for displacement when the unit is loaded with load. In this application, the micro-displacement sensors only need to be installed and fixed once, without needing to be zeroed again. All measured displacement values ​​are automatically acquired without manual intervention, which greatly increases the overall installation efficiency of the hydro-generator unit and improves the installation accuracy.

[0056] This application achieves online monitoring of the dynamic load of thrust bearings by monitoring the dynamic load displacement of the thrust bearing pads, and determines whether there are imbalance problems based on the dynamic load displacement, thus enabling online monitoring and judgment of imbalance problems. The entire detection and calculation process requires no manual intervention.

[0057] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A thrust pad force monitoring method for a multi-point statically indeterminate structure, characterized in that, The thrust pad stress monitoring method of the multi-point static indeterminate structure comprises the following steps: S1: micro-displacement sensor installation, install micro-displacement sensors on the thrust pad one by one, and the axis of each thrust pad and the axis of the corresponding micro-displacement sensor are on the same straight line; S2: during the operation of the unit, the real-time load displacement of each thrust pad when the rotor rotates to a certain position is synchronously obtained through all micro-displacement sensors; S3: the dynamic load displacement of each thrust pad is calculated according to the initial load displacement and the real-time load displacement; S4: whether there is poor balance is judged according to the dynamic load displacement; when there is poor balance, an alarm is issued; otherwise, S5 is entered; S5: repeat S2 to S5 to complete the monitoring of each thrust pad.

2. The method for monitoring the force on a thrust bearing of a multi-point statically indeterminate structure as described in claim 1, characterized in that, Step S1 comprises: identify the vertical position of each thrust pad stress support point, drill corresponding through holes at the projection position of the thrust pad, and make the center point position of the through hole coincide with the center position of the spring bundle positioning guide column below, install a micro-displacement sensor installation positioning sleeve, and then install micro-displacement sensors on the thrust pad one by one, so that the axis of each thrust pad and the axis of the corresponding micro-displacement sensor are on the same straight line.

3. The method for monitoring the force on a thrust bearing of a multi-point statically indeterminate structure as described in claim 2, characterized in that, Step S1 further comprises: obtaining the measurement displacement value of the corresponding micro-displacement sensor during the installation of each micro-displacement sensor, and fixing and installing the micro-displacement sensor and reinstalling the thrust pad when the corresponding measurement displacement value is one quarter of the micro-displacement sensor range ± 0.1 mm.

4. The method for monitoring the force on a thrust bearing of a multi-point statically indeterminate structure as described in claim 1, characterized in that, Between step S1 and step S2, each thrust pad is adjusted, including: S101: when the unit is not loaded, the measurement displacement values of all micro-displacement sensors are synchronously obtained, and the initial load displacement of each thrust pad at the same time point when the unit is not loaded is obtained; S102: when the unit is loaded, the measurement displacement values of all micro-displacement sensors are synchronously obtained, and the static load displacement of each thrust pad at the same time point when the unit is loaded is obtained; S103: the static relative load displacement of each thrust pad is calculated according to the initial load displacement and the static load displacement, and the average value of the static load displacement is calculated; S104: the static displacement difference value of each thrust pad is calculated according to the static relative load displacement of each thrust pad and the average value of the static load displacement, and whether the static displacement difference value is less than the design requirement value is judged, if yes, the adjustment is completed, otherwise, step S105 is entered; S105: the number of thrust pad lower support spring bundles is adjusted according to the static displacement difference value, and steps S101 to S104 are repeated until the static displacement difference value of each thrust pad is less than the design requirement value.

5. The method for monitoring the force on a thrust bearing of a multi-point statically indeterminate structure as described in claim 4, characterized in that, In steps S101 and S102, the same time point measurement values of all micro-displacement sensors are synchronously obtained by sending a synchronous signal to all micro-displacement sensors to start detection.

6. The method for monitoring the force on a thrust bearing of a multi-point statically indeterminate structure as described in claim 4, characterized in that, In step S103, the static load displacement calculation formula of each thrust pad is: wherein, is the static load displacement of the i-th thrust pad when the machine is loaded with the load, is the initial load displacement of the i-th thrust pad when the machine is not loaded with the load, is the static relative load displacement of the i-th thrust pad. The formula for calculating the static load displacement average is: where n is the number of thrust pads.

7. The method for monitoring the force on a thrust bearing of a multi-point statically indeterminate structure as described in claim 1, characterized in that, In step S3, the dynamic load displacement calculation formula of each thrust pad is: wherein, is the real-time load displacement of the i-th thrust pad, is the initial load displacement of the i-th thrust pad when unloaded, is the dynamic load displacement of the i-th thrust pad.

8. A thrust pad force monitoring system for a multi-point statically indeterminate structure, characterized by, The thrust pad stress monitoring system adopts the thrust pad stress monitoring method of any one of claims 1 to 7 to complete the thrust pad stress monitoring; The thrust pad stress monitoring system comprises a micro displacement sensor, a sensing transmitter, a preamplifier and a monitoring host; Each micro displacement sensor is electrically connected with the sensing transmitter, the micro displacement sensor detects the stress change of the hydraulic turbine unit, converts the change into physical change, and then converts the physical change into a digital signal by the sensing transmitter, The preamplifier is electrically connected with the sensing transmitter to realize real-time acquisition of the output signal of the sensing transmitter; The monitoring host is electrically connected with the preamplifier, completes data model processing on the data acquired from the preamplifier, displays the processed data in a visualized manner, and can also output the data to a remote end through an RS485 communication interface.

9. The thrust pad force monitoring system of a multi-point static indeterminate structure of claim 8, wherein, The probe of the micro displacement sensor is opposite to and adheres to the center guide column of the spring bundle to detect the initial load displacement of the corresponding micro displacement sensor during installation, detect the static load displacement of the corresponding micro displacement sensor in a static stress state, and detect the real-time load displacement of the corresponding micro displacement sensor in a dynamic stress state.

10. A hydroelectric generating unit characterized by The hydraulic turbine generator unit comprises the thrust pad stress monitoring system according to claim 8 or 9.

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