Strain-based self-synchronous clutch dynamic centering state detection method and system

Abstract

The application relates to the technical field of clutch detection, and discloses a self-synchronous clutch dynamic alignment state detection method and system based on strain, which comprises the following steps: obtaining the bending moment change amount corresponding to the preset strain measurement section on both sides of the self-synchronous clutch after engagement; changing the bearing height of the self-synchronous clutch; calculating the bending moment change amount and the shear force change amount of the engagement section of the self-synchronous clutch; calculating the sensitivity matrix of the shear force and the bending moment of the engagement section of the self-synchronous clutch to the bearing height change on both sides; calculating the bearing heights on both sides of the self-synchronous clutch according to the sensitivity matrix and the additional bending moment and the additional shear force of the engagement section; and calculating the dynamic alignment deviation between the bearings on both sides of the self-synchronous clutch before engagement according to the bearing heights on both sides of the self-synchronous clutch and the structural parameters, so that the dynamic alignment state of the self-synchronous clutch is detected, and the alignment state of the two rotating shafts before engagement of the self-synchronous clutch can be more accurately and effectively reflected.

Description

Technical Field

[0001] This invention relates to the field of clutch detection technology, and in particular to a strain-based method and system for detecting the dynamic alignment state of a self-synchronizing clutch. Background Technology

[0002] The gas turbine has a self-synchronizing clutch between the generator and the high-pressure rotor of the steam turbine, such as... Figure 1 As shown, Figure 1 This diagram illustrates the connection structure between the bearings of a gas turbine generator set. A self-synchronizing clutch, relying on its own mechanism, enables the engagement and disengagement of the rotors on both sides. When the input shaft speed tends to exceed that of the output shaft, the clutch engages, driving the output shaft, and the gas turbine, generator, high-pressure rotor, and medium- and low-pressure rotors rotate synchronously as a whole. When the input shaft speed tends to decrease relative to the output shaft, a reverse torque is generated, the clutch disengages, and the gas turbine and generator rotate synchronously, as do the high-pressure and medium- and low-pressure rotors. The self-synchronizing clutch has a simple structure, requires no auxiliary equipment, and operates reliably, improving the power generation flexibility of gas turbine generator sets and is widely used in them.

[0003] The dynamic alignment of the two shafts on both sides of the self-synchronizing clutch has a significant impact on shaft system vibration, mainly manifested in the following ways:

[0004] (1) After the shaft alignment changes, the elevation of the bearings on both sides will change, thereby changing the working load borne by the bearings on both sides of the clutch. Heavy-load bearings are prone to bearing wear, broken bearings and high bearing temperature, which can lead to bearing damage; light-load bearings are prone to oil film instability, which can lead to large vibrations.

[0005] (2) When the shaft misalignment occurs, the rotors on both sides of the clutch are out of sync. A large impact force and impact torque will be generated at the moment of engagement, affecting the safe operation and life of the clutch. The impact force and impact torque generated at the moment of engagement can also induce vibration faults such as oil film instability.

[0006] Therefore, misalignment of the rotors on both sides of the self-synchronizing clutch is a significant cause of clutch vibration failure, and the alignment status between the rotors on both sides of the clutch is a crucial basis for unit fault analysis. Thus, a method and device are needed to detect the dynamic alignment status between the rotors on both sides of the clutch before engagement, thereby guiding the operation and adjustment of the clutch.

[0007] Currently, there are two main methods for evaluating the alignment status of the self-synchronizing clutch of a gas turbine generator set: the direct method and the indirect method.

[0008] The direct method employs dial indicator and laser methods. The dial indicator method involves fixing a dial indicator to one side of the automatic self-synchronizing clutch, shaft A, and measuring the outer diameter of the hub on the other side, shaft B. Then, the dial indicator is fixed to shaft B, and the outer diameter of the hub on shaft A is measured. Based on this, the alignment of the two shafts on the automatic self-synchronizing clutch is calculated. The dial indicator method includes radial-axial and dual-radial methods. The radial-axial method uses one dial indicator to measure the concentricity deviation, while the other measures the angular deviation. The dual-radial method uses two dial indicators to measure the concentricity deviation at the measurement points on opposite shafts, and calculates the concentricity and angular deviation of the shaft system using the two sets of data. The laser alignment method operates on the same principle as the dial indicator method but utilizes more advanced and precise optical technology, reducing the error of the dial indicator alignment method.

[0009] The indirect method analyzes the alignment between the two shafts of the clutch by observing changes in the center position of the journals on both sides of the clutch, changes in bearing temperature, and changes in vibration before and after engagement. This method assumes that when there is a deviation in the alignment, the center position of the journals on both sides of the clutch, the bearing temperature, and bearing vibration will change before and after engagement. Therefore, the alignment before clutch engagement can be assessed based on these changes in parameters.

[0010] However, research has revealed that dial indicator or laser alignment methods are performed under static conditions. During the start-up and acceleration of a heavy-duty gas turbine, the journal center shifts and rises in the direction of rotation under the influence of oil film force. Differences in bearing load, bearing clearance, and length result in varying journal rise, causing dynamic changes in the alignment of the two shafts on either side of the clutch. Furthermore, the self-synchronizing clutch of a gas turbine generator has a generator rotor on one side and a high-pressure turbine rotor on the other. The ambient temperature of the high-pressure turbine rotor's operating area is significantly higher than that of the generator rotor, leading to unequal thermal expansion of the bearing housings on both sides, which also alters the dynamic alignment between the two shafts. Two rotors that are well-aligned at rest may be misaligned under actual operating conditions, i.e., dynamically misaligned.

[0011] The indirect method can only perform qualitative analysis of the dynamic alignment between the two shafts of the clutch, which is highly subjective and difficult to perform quantitative analysis.

[0012] In summary, there is currently a lack of effective methods for detecting the dynamic alignment state of the two rotating shafts on both sides of a self-synchronizing clutch. Summary of the Invention

[0013] This invention provides a strain-based method and system for detecting the dynamic alignment state of a self-synchronizing clutch, solving the technical problem of the lack of an effective method for detecting the dynamic alignment state of the rotating shafts on both sides of a self-synchronizing clutch.

[0014] In view of this, the first aspect of the present invention provides a strain-based method for detecting the dynamic alignment state of a self-synchronizing clutch, applied to a gas turbine generator set. The gas turbine generator set includes a gas turbine rotor, a generator rotor, a high-pressure turbine rotor, and a medium- and low-pressure rotor connected sequentially by bearings. A self-synchronizing clutch is connected between the generator rotor and the high-pressure turbine rotor of the gas turbine generator set. Before the self-synchronizing clutch engages, the gas turbine rotor and the generator rotor rotate synchronously, and the high-pressure turbine rotor and the medium- and low-pressure rotor rotate synchronously. After the self-synchronizing clutch engages, the gas turbine rotor, the generator rotor, the high-pressure turbine rotor, and the medium- and low-pressure rotor all rotate synchronously. The method includes the following steps:

[0015] Obtain the bending moment change corresponding to the preset strain measurement sections on both sides of the self-synchronizing clutch after engagement;

[0016] The additional bending moment and additional shear force of the self-synchronizing clutch are calculated by the bending moment change corresponding to the preset strain measurement sections on both sides of the self-synchronizing clutch.

[0017] By changing the bearing heights on both sides of the self-synchronizing clutch in the engaged state, the bending moment change of the preset strain measurement sections on both sides of the self-synchronizing clutch in the static state is obtained, thereby calculating the bending moment change and shear force change of the engagement section of the self-synchronizing clutch, and calculating the sensitivity matrix of the shear force and bending moment of the engagement section of the self-synchronizing clutch to the change of bearing elevation on both sides.

[0018] The elevations of the bearings on both sides of the self-synchronizing clutch are calculated based on the additional bending moment, additional shear force, and sensitivity matrix of the meshing section of the self-synchronizing clutch.

[0019] The dynamic alignment deviation between the two bearings before engagement of the self-synchronizing clutch is calculated based on the bearing elevations on both sides of the self-synchronizing clutch and the structural parameters of the self-synchronizing clutch.

[0020] The dynamic alignment state of the self-synchronizing clutch is detected based on the dynamic alignment deviation between the two bearings before engagement.

[0021] Preferably, the step of obtaining the bending moment change corresponding to the preset strain measurement sections on both sides of the self-synchronizing clutch after engagement specifically includes:

[0022] A bending strain gauge is set on each of the preset strain measurement sections on both sides of the self-synchronizing clutch. The bending strain gauge is also connected to the bending strain gauge through a full-bridge circuit to obtain the bending moment borne by the bending strain gauge due to the corresponding preset strain measurement section, and thus obtain the dynamic bending moment signal of the section.

[0023] Obtain the dynamic bending moment signals of the preset strain measurement sections on both sides of the self-synchronizing clutch before and after engagement;

[0024] The difference is obtained by performing differential processing on the average values ​​of the dynamic bending moment signals of the preset strain measurement sections on both sides of the self-synchronizing clutch before and after engagement, to obtain the bending moment changes corresponding to the preset strain measurement sections on both sides of the self-synchronizing clutch after engagement.

[0025] Preferably, the step of calculating the additional bending moment and additional shear force of the meshing section of the self-synchronizing clutch by the bending moment changes corresponding to the preset strain measurement sections on both sides of the self-synchronizing clutch specifically includes:

[0026] Based on the changes in bending moment corresponding to the preset strain measurement sections on both sides of the self-synchronizing clutch, the additional bending moment and additional shear force at the meshing section of the self-synchronizing clutch are calculated using the following formula:

[0027]

[0028]

[0029] In the formula, M c For the additional bending moment, Q c For the additional shear force, ΔM1 and ΔM2 are the bending moment changes corresponding to the preset strain measurement sections on the left and right sides, respectively. l1 is the shortest distance between the preset strain measurement section on the left and the meshing section, and l2 is the shortest distance between the preset strain measurement section on the right and the meshing section.

[0030] Preferably, the steps of obtaining the bending moment change of the preset strain measurement section on both sides of the self-synchronizing clutch in static state by changing the bearing height on both sides of the self-synchronizing clutch in the engaged state, thereby calculating the bending moment change and shear force change of the engagement section of the self-synchronizing clutch, and calculating the sensitivity matrix of the shear force and bending moment of the engagement section of the self-synchronizing clutch to the change of bearing elevation on both sides, specifically include:

[0031] A shim of a predetermined height is added below the left bearing of the self-synchronizing clutch in the engaged state, so that the horizontal space height of the left bearing of the self-synchronizing clutch is higher than that of its right bearing. The bending moment change of the self-synchronizing clutch at the predetermined strain measurement sections on both sides under static conditions is obtained, and the bending moment change and shear force change of the engagement section of the self-synchronizing clutch are calculated and denoted as ΔM. c1 ,ΔQ c1 ;

[0032] A shim of a predetermined height is added below the right bearing of the self-synchronizing clutch in the engaged state, so that the horizontal space height of the right bearing of the self-synchronizing clutch is higher than that of its left bearing. The bending moment change of the predetermined strain measurement sections on both sides of the self-synchronizing clutch in the static state is obtained, and the bending moment change and shear force change of the engagement section of the self-synchronizing clutch are calculated and denoted as ΔM. c2 ,ΔQ c2 ;

[0033] The sensitivity matrix Λ of the shear force and bending moment of the self-synchronizing clutch's meshing section to the change in bearing elevation on both sides is calculated using the changes in bending moment and shear force at the meshing section of the self-synchronizing clutch.

[0034]

[0035] Preferably, the step of calculating the bearing elevations on both sides of the self-synchronizing clutch based on the additional bending moment, additional shear force, and sensitivity matrix of the meshing section of the self-synchronizing clutch specifically includes:

[0036] The elevations of the bearings on both sides of the self-synchronizing clutch are calculated using the following formula based on the additional bending moment, additional shear force, and sensitivity matrix of the meshing section:

[0037]

[0038] In the formula, y5 is the elevation of the left bearing of the self-synchronizing clutch, and y6 is the elevation of the right bearing of the self-synchronizing clutch.

[0039] Preferably, the step of calculating the dynamic alignment deviation between the two bearings of the self-synchronizing clutch before engagement, based on the bearing elevations on both sides of the self-synchronizing clutch and the structural parameters of the self-synchronizing clutch, specifically includes:

[0040] Based on the bearing elevations on both sides of the self-synchronizing clutch and the structural parameters of the self-synchronizing clutch, the dynamic alignment deviation between the bearings on both sides before engagement is calculated using the following formula. The dynamic alignment deviation includes the height difference and the angle of divergence, which are calculated as follows:

[0041]

[0042]

[0043] In the formula, δ is the height difference, θ is the angle, b1 is the shortest distance between the right bearing of the generator rotor and the left bearing of the self-synchronizing clutch, b2 is the shortest distance between the left bearing of the self-synchronizing clutch and the meshing section of the self-synchronizing clutch, b3 is the shortest distance between the right bearing of the self-synchronizing clutch and the meshing section of the self-synchronizing clutch, and b4 is the shortest distance between the right bearing of the self-synchronizing clutch and the right bearing of the high-voltage rotor.

[0044] Preferably, the step of detecting the dynamic alignment state of the self-synchronizing clutch based on the dynamic alignment deviation between the two bearings before engagement specifically includes:

[0045] The dynamic alignment state of the self-synchronizing clutch is detected based on the elevation difference and the opening angle, specifically as follows:

[0046] If the height difference is positive, the horizontal space height of the left shaft of the self-synchronizing clutch is higher than that of its right shaft. If the height difference is negative, the horizontal space height of the right shaft of the self-synchronizing clutch is higher than that of its left shaft. If the height difference is zero, the horizontal space height of the left shaft of the self-synchronizing clutch is equal to that of its right shaft.

[0047] If the angle is positive, the included angle between the two shafts of the self-synchronizing clutch is an upper opening; if the angle is negative, the included angle between the two shafts of the self-synchronizing clutch is a lower opening; if the angle is zero, the included angle between the two shafts of the self-synchronizing clutch is not open.

[0048] Secondly, the present invention also provides a strain-based self-synchronizing clutch dynamic alignment state detection system, applied to a gas turbine generator set. The gas turbine generator set includes a gas turbine rotor, a generator rotor, a high-pressure turbine rotor, and a medium- and low-pressure rotor connected sequentially by bearings. A self-synchronizing clutch is connected between the generator rotor and the high-pressure turbine rotor of the gas turbine generator set. Before the self-synchronizing clutch engages, the gas turbine rotor and the generator rotor rotate synchronously, and the high-pressure turbine rotor and the medium- and low-pressure rotor rotate synchronously. After the self-synchronizing clutch engages, the gas turbine rotor, the generator rotor, the high-pressure turbine rotor, and the medium- and low-pressure rotor all rotate synchronously. The system includes:

[0049] The acquisition module is used to acquire the bending moment changes corresponding to the preset strain measurement sections on both sides of the self-synchronizing clutch after engagement.

[0050] The first calculation module is used to calculate the additional bending moment and additional shear force of the meshing section of the self-synchronizing clutch by the bending moment change corresponding to the preset strain measurement sections on both sides of the self-synchronizing clutch.

[0051] The second calculation module is used to obtain the bending moment change of the preset strain measurement section on both sides of the self-synchronizing clutch in static state by changing the bearing height on both sides of the self-synchronizing clutch in the meshing state, thereby calculating the bending moment change and shear force change of the meshing section of the self-synchronizing clutch, and calculating the sensitivity matrix of the shear force and bending moment of the meshing section of the self-synchronizing clutch to the change of bearing elevation on both sides.

[0052] The third calculation module is used to calculate the bearing elevations on both sides of the self-synchronizing clutch based on the additional bending moment, additional shear force, and sensitivity matrix of the meshing section of the self-synchronizing clutch.

[0053] The deviation calculation module is used to calculate the dynamic alignment deviation between the two bearings of the self-synchronizing clutch before engagement based on the bearing elevations on both sides of the self-synchronizing clutch and the structural parameters of the self-synchronizing clutch.

[0054] The alignment status detection module is used to detect the dynamic alignment status of the self-synchronizing clutch based on the dynamic alignment deviation between the bearings on both sides before engagement.

[0055] As can be seen from the above technical solutions, the present invention has the following advantages:

[0056] This invention obtains the bending moment changes corresponding to preset strain measurement sections on both sides of the self-synchronizing clutch after engagement, calculates the additional bending moment and additional shear force of the engagement section of the self-synchronizing clutch, obtains the bending moment changes of the preset strain measurement sections on both sides of the self-synchronizing clutch by changing the bearing height, and thus calculates the bending moment and shear force changes of the engagement section of the self-synchronizing clutch, and calculates the sensitivity matrix of the shear force and bending moment of the engagement section of the self-synchronizing clutch to the changes in the bearing elevation on both sides. Based on the sensitivity matrix and the additional bending moment and additional shear force of the engagement section of the self-synchronizing clutch, the bearing elevations on both sides of the self-synchronizing clutch are calculated. Based on the bearing elevations on both sides of the self-synchronizing clutch and the structural parameters of the self-synchronizing clutch, the dynamic alignment deviation between the bearings on both sides before engagement is calculated, thereby detecting the dynamic alignment state of the self-synchronizing clutch. This achieves the detection of the dynamic alignment state of the self-synchronizing clutch based on the change in the bending moment value of the shaft sections on both sides of the clutch before and after engagement, which can more accurately and effectively reflect the alignment state of the two shafts before engagement of the self-synchronizing clutch compared to static alignment. Attached Figure Description

[0057] Figure 1This is a schematic diagram of the structure of a gas turbine generator set provided in an embodiment of the present invention;

[0058] Figure 2 This is a schematic diagram of the structure of the gas turbine shaft section before engagement of the self-synchronizing clutch provided in an embodiment of the present invention;

[0059] Figure 3 A schematic diagram of the structure of the high-pressure turbine rotor before engagement of the self-synchronizing clutch provided in an embodiment of the present invention;

[0060] Figure 4 This is a schematic diagram of the structure of the gas turbine generator set shaft system after the self-synchronizing clutch is engaged, provided in an embodiment of the present invention.

[0061] Figure 5 A flowchart of a strain-based dynamic alignment state detection method for a self-synchronizing clutch provided in an embodiment of the present invention;

[0062] Figure 6 This is a schematic diagram of a full-bridge circuit structure provided in an embodiment of the present invention;

[0063] Figure 7 This is a schematic diagram of the structure of the self-synchronizing clutch shaft section provided in an embodiment of the present invention;

[0064] Figure 8 A schematic diagram of the structural parameters of the self-synchronizing clutch provided in an embodiment of the present invention;

[0065] Figure 9 This is a schematic diagram of a strain-based self-synchronizing clutch dynamic alignment state detection system provided in an embodiment of the present invention. Detailed Implementation

[0066] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and 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.

[0067] This invention provides a strain-based method for detecting the dynamic alignment state of a self-synchronizing clutch, applicable to gas turbine generator sets, such as... Figure 1 As shown, Figure 1The diagram illustrates the structure of a gas turbine generator set, which includes a gas turbine rotor, a generator rotor, a high-pressure turbine rotor, and a medium- and low-pressure turbine rotor connected sequentially by bearings. A self-synchronizing clutch is connected between the generator rotor and the high-pressure turbine rotor. Before the self-synchronizing clutch engages, the gas turbine rotor and the generator rotor rotate synchronously, and the high-pressure turbine rotor and the medium- and low-pressure turbine rotor rotate synchronously. After the self-synchronizing clutch engages, the gas turbine rotor, the generator rotor, the high-pressure turbine rotor, and the medium- and low-pressure turbine rotor all rotate synchronously.

[0068] Among them, such as Figure 1 As shown, the gas turbine generator set can be a heavy-duty gas turbine generator set. Specifically, the gas turbine generator set has a total of 8 bearings, L1-L8. The left side of the gas turbine rotor is connected to bearing L1, and its right side is connected to the left side of the generator rotor in sequence through bearing L2, intermediate shaft and bearing L3. The right side of the generator rotor is connected to the left side of the self-synchronizing clutch in sequence through bearings L4 and L5. The right side of the self-synchronizing clutch is connected to the left side of the high-pressure turbine rotor through bearing L6. The right side of the high-pressure turbine rotor is connected to the left side of the medium and low-pressure rotor through bearing L7. The right side of the medium and low-pressure rotor is connected to bearing L8.

[0069] Figure 2 A schematic diagram of the gas turbine shaft section before engagement of the self-synchronizing clutch is given. Figure 3 A schematic diagram of the high-pressure turbine rotor before engagement of the self-synchronizing clutch is given. Figure 4 A schematic diagram of the shaft system of a gas turbine generator set after the self-synchronizing clutch is engaged is given. The self-synchronizing clutch, also known as an automatic synchronizing clutch, connects two shaft segments into a whole after engagement, allowing them to rotate synchronously.

[0070] The dynamic alignment of the two shafts on both sides of the self-synchronizing clutch has a significant impact on shaft system vibration, mainly manifested in the following ways:

[0071] (1) After the shaft alignment changes, the elevation of the bearings on both sides will change, thereby changing the working load borne by the bearings on both sides of the clutch. Heavy-load bearings are prone to bearing wear, broken bearings and high bearing temperature, which can lead to bearing damage; light-load bearings are prone to oil film instability, which can lead to large vibrations.

[0072] (2) When the shaft misalignment occurs, the rotors on both sides of the clutch are out of sync. A large impact force and impact torque will be generated at the moment of engagement, affecting the safe operation and life of the clutch. The impact force and impact torque generated at the moment of engagement can also induce vibration faults such as oil film instability.

[0073] Due to the squeezing effect of the oil film inside the bearing and the influence of the temperature field, there is a deviation between the dynamic and static alignment states of the shafts on both sides of the self-synchronizing clutch in a gas turbine generator set. In order to improve the operational stability and reliability of heavy-duty gas turbines, it is necessary to detect and analyze the dynamic alignment state of the shafts on both sides of the clutch.

[0074] Therefore, misalignment of the rotors on both sides of the self-synchronizing clutch is a significant cause of clutch vibration failure, and the alignment status between the rotors on both sides of the clutch is a crucial basis for unit fault analysis. Thus, a method and device are needed to detect the dynamic alignment status between the rotors on both sides of the clutch before engagement, thereby guiding the operation and adjustment of the clutch.

[0075] For easier understanding, please refer to Figure 5 The present invention provides a strain-based method for detecting the dynamic alignment state of a self-synchronizing clutch, comprising the following steps:

[0076] 101. Obtain the bending moment change corresponding to the preset strain measurement sections on both sides of the self-synchronizing clutch after engagement.

[0077] Two strain measurement sections can be selected on both sides of the self-synchronizing clutch to test the strain of the two side sections of the self-synchronizing clutch.

[0078] 102. Calculate the additional bending moment and additional shear force of the meshing section of the self-synchronizing clutch by the bending moment changes corresponding to the preset strain measurement sections on both sides of the self-synchronizing clutch.

[0079] It should be noted that the self-synchronizing clutch of a gas turbine generator set is mainly used to bear and transmit torque between the generator and the high-pressure rotor of the turbine. If the dynamic alignment between the two shafts is good, and the two shafts of the clutch are on the same center line, the engaged self-synchronizing clutch mainly bears torque, and the shear force and bending moment it experiences are relatively small. If the dynamic alignment deviates, and the two shafts of the self-synchronizing clutch are no longer on the same center line, the engaged self-synchronizing clutch will experience additional shear force and bending moment. The shear force and bending moment borne by the engagement section of the self-synchronizing clutch under dynamic alignment deviation can be calculated from the changes in bending moment borne by the two shaft sections of the clutch.

[0080] 103. By changing the bearing heights on both sides of the self-synchronizing clutch in the meshing state, the bending moment change of the preset strain measurement sections on both sides of the self-synchronizing clutch in the static state is obtained. Then, the bending moment change and shear force change of the meshing section of the self-synchronizing clutch are calculated, and the sensitivity matrix of the shear force and bending moment of the meshing section of the self-synchronizing clutch to the change of bearing elevation on both sides is calculated.

[0081] In one example, the bearing heights on both sides of the self-synchronizing clutch in the engaged state are changed. Specifically, when the self-synchronizing clutch is engaged, a shim is added to the left bearing L5 of the self-synchronizing clutch, making the left bearing higher than its right bearing; then the shim is removed from the left bearing L5, and a shim is added to the right bearing L6, making the right bearing higher than its left bearing. The bending moment changes of the preset strain measurement sections on both sides of the self-synchronizing clutch under static conditions are obtained. Thus, the bending moment changes and shear force changes of the engagement section of the self-synchronizing clutch are calculated. By raising the bearing elevation and testing the bending moment changes of the section, the sensitivity matrix of the clutch section shear force and bending moment to the changes in the bearing elevations on both sides is obtained.

[0082] 104. Calculate the bearing elevations on both sides of the self-synchronizing clutch based on the additional bending moment, additional shear force, and sensitivity matrix of the meshing section of the self-synchronizing clutch.

[0083] 105. Calculate the dynamic alignment deviation between the two bearings of the self-synchronizing clutch before engagement based on the bearing elevations on both sides of the self-synchronizing clutch and the structural parameters of the self-synchronizing clutch.

[0084] 106. The dynamic alignment status of the self-synchronizing clutch is detected based on the dynamic alignment deviation between the bearings on both sides before engagement.

[0085] It should be noted that the strain-based dynamic alignment state detection method for a self-synchronizing clutch provided by this invention obtains the bending moment changes corresponding to preset strain measurement sections on both sides of the self-synchronizing clutch after engagement, calculates the additional bending moment and additional shear force of the engagement section of the self-synchronizing clutch, obtains the bending moment changes of the preset strain measurement sections on both sides of the self-synchronizing clutch by changing the bearing height, and thus calculates the bending moment and shear force changes of the engagement section of the self-synchronizing clutch, and calculates the sensitivity of the shear force and bending moment of the engagement section of the self-synchronizing clutch to changes in the bearing elevation on both sides. The system uses a matrix to calculate the bearing elevations on both sides of the self-synchronizing clutch based on the sensitivity matrix and the additional bending moment and shear force of the meshing section. It then calculates the dynamic alignment deviation between the bearings on both sides before engagement based on the bearing elevations and structural parameters of the self-synchronizing clutch. This allows for the detection of the dynamic alignment state of the self-synchronizing clutch by analyzing the changes in bending moment values ​​on both sides of the clutch shaft section before and after engagement. Compared to static alignment, this method more accurately and effectively reflects the alignment state of the two shafts before engagement.

[0086] In one specific embodiment, step 101 specifically includes:

[0087] 1011. A bending strain gauge is set on each of the preset strain measurement sections on both sides of the self-synchronizing clutch. The bending strain gauge is also connected to the bending strain gauge through a full-bridge circuit to obtain the bending moment borne by the bending strain gauge due to the corresponding preset strain measurement section, and thus obtain the dynamic bending moment signal of the section.

[0088] To improve testing accuracy, a full-bridge circuit is connected to the bending strain gauge. The full-bridge circuit uses the following... Figure 6 The full-bridge circuit structure shown is used to test the bending strain of the cross section and obtain the dynamic bending moment signal of the cross section. and

[0089] In the rotating state, the dynamic bending moment signal of the cross section of the self-synchronizing clutch can be tested wirelessly. That is, after the full-bridge circuit obtains the dynamic bending moment signal of the cross section, it wirelessly transmits the dynamic bending moment signal of the cross section to the back-end.

[0090] 1012. Obtain the dynamic bending moment signals of the preset strain measurement sections on both sides of the self-synchronizing clutch before and after engagement.

[0091] 1013. By performing difference processing on the average values ​​of the dynamic bending moment signals of the preset strain measurement sections on both sides of the self-synchronizing clutch before and after engagement, the bending moment changes corresponding to the preset strain measurement sections on both sides of the self-synchronizing clutch after engagement are obtained.

[0092] Among them, the bending moments on the preset strain measurement sections before the self-synchronizing clutch engage are M1 and M2, respectively, and the bending moments on the preset strain measurement sections before the self-synchronizing clutch engage are M1' and M'2, respectively. The changes in bending moments on the preset strain measurement sections on both sides are ΔM1 and ΔM2, respectively.

[0093] ΔM1=M1'-M1

[0094] ΔM2=M2'-M2

[0095] In one specific embodiment, step 102 specifically includes:

[0096] Based on the changes in bending moment corresponding to the preset strain measurement sections on both sides of the self-synchronizing clutch, the additional bending moment and additional shear force at the meshing section of the self-synchronizing clutch are calculated using the following formulas:

[0097]

[0098]

[0099] In the formula, M c For the additional bending moment, Q cFor the additional shear force, ΔM1 and ΔM2 are the bending moment changes corresponding to the preset strain measurement sections on the left and right sides, respectively. l1 is the shortest distance between the preset strain measurement section on the left and the meshing section, and l2 is the shortest distance between the preset strain measurement section on the right and the meshing section.

[0100] The specific structural parameters are as follows: Figure 7 As shown, Figure 7 A schematic diagram of the structure of the self-synchronizing clutch shaft section is shown, wherein the preset strain measurement sections on both sides of the self-synchronizing clutch are defined as strain measurement section 1 and strain measurement section 2, respectively.

[0101] In one specific embodiment, step 103 specifically includes:

[0102] 1031. With the self-synchronizing clutch engaged, add a shim of a preset height below the left bearing, making the horizontal space height of the left bearing higher than that of the right bearing. Obtain the bending moment change at preset strain measurement sections on both sides of the self-synchronizing clutch under static conditions. Then calculate the bending moment change and shear force change at the engagement section of the self-synchronizing clutch, denoted as ΔM. c1 ,ΔQ c1 ;

[0103] 1032. With the self-synchronizing clutch engaged, add a shim of a predetermined height below the right bearing, making the horizontal space height of the right bearing higher than that of the left bearing. Obtain the bending moment change at predetermined strain measurement sections on both sides of the self-synchronizing clutch under static conditions. Then calculate the bending moment change and shear force change at the engagement section of the self-synchronizing clutch, denoted as ΔM. c2 ,ΔQ c2 ;

[0104] The preset height of the gasket can be 0.1mm.

[0105] 1033. The sensitivity matrix Λ of the shear force and bending moment of the self-synchronizing clutch's meshing section to the change in bearing elevation on both sides is calculated using the changes in bending moment and shear force at the meshing section:

[0106]

[0107] In one specific embodiment, step 104 specifically includes:

[0108] The elevations of the bearings on both sides of the self-synchronizing clutch are calculated using the following formula based on the additional bending moment, additional shear force, and sensitivity matrix of the meshing section:

[0109]

[0110] In the formula, y5 is the elevation of the left bearing of the self-synchronizing clutch, and y6 is the elevation of the right bearing of the self-synchronizing clutch.

[0111] In one specific embodiment, step 105 specifically includes:

[0112] Based on the bearing elevations on both sides of the self-synchronizing clutch and the structural parameters of the self-synchronizing clutch, the dynamic alignment deviation between the bearings on both sides before engagement is calculated using the following formula. The dynamic alignment deviation includes the height difference and the angle of divergence, which are calculated as follows:

[0113]

[0114]

[0115] In the formula, δ is the height difference, θ is the angle, b1 is the shortest distance between the right bearing of the generator rotor and the left bearing of the self-synchronizing clutch, b2 is the shortest distance between the left bearing of the self-synchronizing clutch and the meshing section of the self-synchronizing clutch, b3 is the shortest distance between the right bearing of the self-synchronizing clutch and the meshing section of the self-synchronizing clutch, and b4 is the shortest distance between the right bearing of the self-synchronizing clutch and the right bearing of the high-voltage rotor.

[0116] For specific structural parameters of the self-synchronizing clutch, see [link to details]. Figure 8 As shown, Figure 8 A schematic diagram illustrating the structural parameters of a self-synchronizing clutch is provided.

[0117] In one specific embodiment, step 106 specifically includes:

[0118] The dynamic alignment status of the self-synchronizing clutch is detected based on the height difference and the opening angle, specifically as follows:

[0119] If the height difference is positive, the horizontal space height of the left shaft of the self-synchronizing clutch is higher than that of the right shaft. If the height difference is negative, the horizontal space height of the right shaft of the self-synchronizing clutch is higher than that of the left shaft. If the height difference is zero, the horizontal space height of the left shaft of the self-synchronizing clutch is equal to that of the right shaft.

[0120] If the opening angle is positive, the angle between the two shafts of the self-synchronizing clutch is an upward opening; if the opening angle is negative, the angle between the two shafts of the self-synchronizing clutch is a downward opening; if the opening angle is zero, the angle between the two shafts of the self-synchronizing clutch is not open.

[0121] The above is a detailed description of an embodiment of a strain-based dynamic alignment state detection method for a self-synchronizing clutch provided by the present invention. The following is a detailed description of an embodiment of a strain-based dynamic alignment state detection system for a self-synchronizing clutch provided by the present invention.

[0122] This invention provides a strain-based self-synchronizing clutch dynamic alignment state detection system, applied to gas turbine generator sets, such as... Figure 1 As shown, the gas turbine generator set includes a gas turbine rotor, a generator rotor, a high-pressure turbine rotor, and a medium- and low-pressure turbine rotor connected in sequence by bearings. A self-synchronizing clutch is connected between the generator rotor and the high-pressure turbine rotor of the gas turbine generator set. Before the self-synchronizing clutch is engaged, the gas turbine rotor and the generator rotor rotate synchronously, and the high-pressure turbine rotor and the medium- and low-pressure turbine rotor rotate synchronously. After the self-synchronizing clutch is engaged, the gas turbine rotor, the generator rotor, the high-pressure turbine rotor, and the medium- and low-pressure turbine rotor all rotate synchronously.

[0123] like Figure 9 As shown, the present invention provides a strain-based dynamic alignment state detection system for a self-synchronizing clutch, comprising:

[0124] The acquisition module 100 is used to acquire the bending moment changes corresponding to the preset strain measurement sections on both sides of the self-synchronizing clutch after engagement.

[0125] The first calculation module 200 is used to calculate the additional bending moment and additional shear force of the meshing section of the self-synchronizing clutch by the bending moment change corresponding to the preset strain measurement sections on both sides of the self-synchronizing clutch.

[0126] The second calculation module 300 is used to obtain the bending moment change of the preset strain measurement section on both sides of the self-synchronizing clutch under static conditions by changing the bearing height on both sides of the self-synchronizing clutch in the meshing state, thereby calculating the bending moment change and shear force change of the meshing section of the self-synchronizing clutch, and calculating the sensitivity matrix of the shear force and bending moment of the meshing section of the self-synchronizing clutch to the change of bearing elevation on both sides.

[0127] The third calculation module 400 is used to calculate the bearing elevations on both sides of the self-synchronizing clutch based on the additional bending moment, additional shear force, and sensitivity matrix of the meshing section of the self-synchronizing clutch.

[0128] The deviation calculation module 500 is used to calculate the dynamic alignment deviation between the two bearings of the self-synchronizing clutch before engagement, based on the elevation of the bearings on both sides of the self-synchronizing clutch and the structural parameters of the self-synchronizing clutch.

[0129] The alignment status detection module 600 is used to detect the dynamic alignment status of the self-synchronizing clutch based on the dynamic alignment deviation between the bearings on both sides before engagement.

[0130] Those skilled in the art will understand that, for the sake of convenience and brevity, the specific working process of the system described above can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0131] In the several embodiments provided by this invention, it should be understood that the disclosed apparatus and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.

[0132] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0133] Furthermore, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0134] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A strain-based dynamic alignment state detection method for a self-synchronizing clutch, applied to a gas turbine generator set, wherein the gas turbine generator set includes a gas turbine rotor, a generator rotor, a high-pressure turbine rotor, and a medium- and low-pressure turbine rotor connected sequentially by bearings, wherein... A self-synchronizing clutch is connected between the generator rotor and the high-pressure rotor of the gas turbine generator set. Before the self-synchronizing clutch engages, the gas turbine rotor and the generator rotor rotate synchronously, and the high-pressure rotor and the medium- and low-pressure rotor of the steam turbine rotate synchronously. After the self-synchronizing clutch engages, the gas turbine rotor, the generator rotor, the high-pressure rotor of the steam turbine, and the medium- and low-pressure rotor all rotate synchronously. The method is characterized by the following steps: Obtain the bending moment change corresponding to the preset strain measurement sections on both sides of the self-synchronizing clutch after engagement; The additional bending moment and additional shear force of the self-synchronizing clutch are calculated by the bending moment change corresponding to the preset strain measurement sections on both sides of the self-synchronizing clutch. By changing the bearing heights on both sides of the self-synchronizing clutch in the engaged state, the bending moment change of the preset strain measurement sections on both sides of the self-synchronizing clutch in the static state is obtained. This allows for the calculation of the bending moment change and shear force change of the engagement section of the self-synchronizing clutch. Furthermore, the sensitivity matrix of the shear force and bending moment of the engagement section of the self-synchronizing clutch to the changes in the bearing elevations on both sides is calculated, including: A shim of a predetermined height is added below the left bearing of the self-synchronizing clutch in the engaged state, making the horizontal space height of the left bearing higher than that of the right bearing. The bending moment changes at predetermined strain measurement sections on both sides of the self-synchronizing clutch under static conditions are obtained. The bending moment and shear force changes at the engagement section of the self-synchronizing clutch are then calculated and denoted as follows: ; A shim of a predetermined height is added below the right bearing of the self-synchronizing clutch in the engaged state, making the horizontal space height of the right bearing higher than that of its left bearing. The bending moment changes at predetermined strain measurement sections on both sides of the self-synchronizing clutch under static conditions are obtained. The bending moment changes and shear force changes at the engagement section of the self-synchronizing clutch are then calculated and denoted as follows: ; The sensitivity matrix of the shear force and bending moment of the self-synchronizing clutch's meshing section to the changes in bearing elevation on both sides is calculated using the changes in bending moment and shear force at the meshing section. for: ； The elevations of the bearings on both sides of the self-synchronizing clutch are calculated based on the additional bending moment, additional shear force, and sensitivity matrix of the meshing section of the self-synchronizing clutch. The dynamic alignment deviation between the two bearings before engagement of the self-synchronizing clutch is calculated based on the bearing elevations on both sides of the self-synchronizing clutch and the structural parameters of the self-synchronizing clutch. The dynamic alignment state of the self-synchronizing clutch is detected based on the dynamic alignment deviation between the two bearings before engagement.

2. The strain-based dynamic alignment state detection method for a self-synchronizing clutch according to claim 1, characterized in that, The steps for obtaining the bending moment changes corresponding to the preset strain measurement sections on both sides of the self-synchronizing clutch after engagement specifically include: A bending strain gauge is set on each of the preset strain measurement sections on both sides of the self-synchronizing clutch. The bending strain gauge is also connected to the bending strain gauge through a full-bridge circuit to obtain the bending moment borne by the bending strain gauge due to the corresponding preset strain measurement section, and thus obtain the dynamic bending moment signal of the section. Obtain the dynamic bending moment signals of the preset strain measurement sections on both sides of the self-synchronizing clutch before and after engagement; The difference is obtained by performing differential processing on the average values ​​of the dynamic bending moment signals of the preset strain measurement sections on both sides of the self-synchronizing clutch before and after engagement, to obtain the bending moment changes corresponding to the preset strain measurement sections on both sides of the self-synchronizing clutch after engagement.

3. The strain-based dynamic alignment state detection method for self-synchronizing clutches according to claim 2, characterized in that, The steps for calculating the additional bending moment and additional shear force of the self-synchronizing clutch at the meshing section by using the bending moment changes corresponding to the preset strain measurement sections on both sides of the self-synchronizing clutch specifically include: Based on the changes in bending moment corresponding to the preset strain measurement sections on both sides of the self-synchronizing clutch, the additional bending moment and additional shear force at the meshing section of the self-synchronizing clutch are calculated using the following formula: In the formula, To add bending moment, To add shear force, , These represent the changes in bending moment corresponding to the preset strain measurement sections on the left and right sides, respectively. This represents the closest distance between the preset strain measurement section on the left and the meshing section. This is the closest distance between the preset strain measurement section on the right and the meshing section.

4. The strain-based dynamic alignment state detection method for a self-synchronizing clutch according to claim 1, characterized in that, The steps for calculating the bearing elevations on both sides of the self-synchronizing clutch based on the additional bending moment, additional shear force, and sensitivity matrix of the meshing section of the self-synchronizing clutch specifically include: The elevations of the bearings on both sides of the self-synchronizing clutch are calculated using the following formula based on the additional bending moment, additional shear force, and sensitivity matrix of the meshing section: In the formula, y 5 represents the elevation of the left bearing of the self-synchronizing clutch. y 6 represents the elevation of the right bearing of the self-synchronizing clutch.

5. The strain-based dynamic alignment state detection method for a self-synchronizing clutch according to claim 4, characterized in that, The steps for calculating the dynamic alignment deviation between the two bearings of the self-synchronizing clutch before engagement, based on the bearing elevations on both sides and the structural parameters of the self-synchronizing clutch, specifically include: Based on the bearing elevations on both sides of the self-synchronizing clutch and the structural parameters of the self-synchronizing clutch, the dynamic alignment deviation between the bearings on both sides before engagement is calculated using the following formula. The dynamic alignment deviation includes the height difference and the angle of divergence, which are calculated as follows: In the formula, For the difference in elevation, For Zhang Jiao, b 1 represents the shortest distance between the right bearing of the generator rotor and the left bearing of the self-synchronizing clutch. b 2 represents the shortest distance between the left bearing of the self-synchronizing clutch and the meshing section of the self-synchronizing clutch. b 3 represents the shortest distance between the right-side bearing of the self-synchronizing clutch and the engagement section of the self-synchronizing clutch. b 4 represents the closest distance between the right bearing of the self-synchronizing clutch and the right bearing of the high-pressure rotor.

6. The strain-based dynamic alignment state detection method for a self-synchronizing clutch according to claim 5, characterized in that, The step of detecting the dynamic alignment state of the self-synchronizing clutch based on the dynamic alignment deviation between the two bearings before engagement specifically includes: The dynamic alignment state of the self-synchronizing clutch is detected based on the elevation difference and the opening angle, specifically as follows: If the height difference is positive, the horizontal space height of the left shaft of the self-synchronizing clutch is higher than that of its right shaft. If the height difference is negative, the horizontal space height of the right shaft of the self-synchronizing clutch is higher than that of its left shaft. If the height difference is zero, the horizontal space height of the left shaft of the self-synchronizing clutch is equal to that of its right shaft. If the angle is positive, the included angle between the two shafts of the self-synchronizing clutch is an upper opening; if the angle is negative, the included angle between the two shafts of the self-synchronizing clutch is a lower opening; if the angle is zero, the included angle between the two shafts of the self-synchronizing clutch is not open.

7. A strain-based self-synchronizing clutch dynamic alignment state detection system, applied to a gas turbine generator set, wherein the gas turbine generator set includes a gas turbine rotor, a generator rotor, a high-pressure turbine rotor, and a medium- and low-pressure turbine rotor connected sequentially by bearings, wherein... A self-synchronizing clutch is connected between the generator rotor and the high-pressure rotor of the gas turbine generator set. Before the self-synchronizing clutch engages, the gas turbine rotor and the generator rotor rotate synchronously, and the high-pressure rotor and the medium- and low-pressure rotor of the steam turbine rotate synchronously. After the self-synchronizing clutch engages, the gas turbine rotor, the generator rotor, the high-pressure rotor of the steam turbine, and the medium- and low-pressure rotor all rotate synchronously. The system is characterized by comprising: The acquisition module is used to acquire the bending moment changes corresponding to the preset strain measurement sections on both sides of the self-synchronizing clutch after engagement. The first calculation module is used to calculate the additional bending moment and additional shear force of the meshing section of the self-synchronizing clutch by the bending moment change corresponding to the preset strain measurement sections on both sides of the self-synchronizing clutch. The second calculation module is used to obtain the bending moment change of the preset strain measurement section on both sides of the self-synchronizing clutch in static state by changing the bearing height on both sides of the self-synchronizing clutch in the meshing state, thereby calculating the bending moment change and shear force change of the meshing section of the self-synchronizing clutch, and calculating the sensitivity matrix of the shear force and bending moment of the meshing section of the self-synchronizing clutch to the change of bearing elevation on both sides. By changing the bearing heights on both sides of the self-synchronizing clutch in the engaged state, the bending moment change of the preset strain measurement sections on both sides of the self-synchronizing clutch in the static state is obtained. This allows for the calculation of the bending moment change and shear force change of the engagement section of the self-synchronizing clutch. Furthermore, the sensitivity matrix of the shear force and bending moment of the engagement section of the self-synchronizing clutch to the changes in the bearing elevations on both sides is calculated, including: A shim of a predetermined height is added below the left bearing of the self-synchronizing clutch in the engaged state, making the horizontal space height of the left bearing higher than that of the right bearing. The bending moment changes at predetermined strain measurement sections on both sides of the self-synchronizing clutch under static conditions are obtained. The bending moment and shear force changes at the engagement section of the self-synchronizing clutch are then calculated and denoted as follows: ; A shim of a predetermined height is added below the right bearing of the self-synchronizing clutch in the engaged state, making the horizontal space height of the right bearing higher than that of its left bearing. The bending moment changes at predetermined strain measurement sections on both sides of the self-synchronizing clutch under static conditions are obtained. The bending moment changes and shear force changes at the engagement section of the self-synchronizing clutch are then calculated and denoted as follows: ; The sensitivity matrix of the shear force and bending moment of the self-synchronizing clutch's meshing section to the changes in bearing elevation on both sides is calculated using the changes in bending moment and shear force at the meshing section. for: ； The third calculation module is used to calculate the bearing elevations on both sides of the self-synchronizing clutch based on the additional bending moment, additional shear force, and sensitivity matrix of the meshing section of the self-synchronizing clutch. The deviation calculation module is used to calculate the dynamic alignment deviation between the two bearings of the self-synchronizing clutch before engagement based on the bearing elevations on both sides of the self-synchronizing clutch and the structural parameters of the self-synchronizing clutch. The alignment status detection module is used to detect the dynamic alignment status of the self-synchronizing clutch based on the dynamic alignment deviation between the bearings on both sides before engagement.

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