A vibration test method for switching working conditions of rotating parts of a thermal power unit

Abstract

The application discloses a kind of thermal power generating unit rotating component operating condition switching vibration test method, it is related to rotating component vibration test technical field, comprising: in the first stable operation condition, three kinds of parameters are collected, form three kinds of parameter range and obtain operating condition switching condition;Switch to second stable operation condition, with the time when rotating component operating parameter first leaves the same kind parameter range of previous stable operation position as the starting point of real operating condition change, update three kinds of parameter range when reaching stable operation condition;After vibration parameter leaves vibration parameter range, operating condition switching is kept or exited according to operating condition switching condition, form vibration change operating range and verify the recovery state of three kinds of parameters;After recovery state verification passes, along the direction of operating condition change first tested, vibration change operating range is retested, and operating condition switching vibration test result is formed.The application realizes the corresponding relationship record of vibration change and rotating component actual operating state, and realizes the same direction local retest of vibration change operating range.

Description

Technical Field

[0001] This invention relates to the field of vibration testing technology for rotating components, and in particular to a vibration testing method for rotating components of thermal power units under different operating conditions. Background Technology

[0002] During load adjustments, changes in flow conditions, or switching of operating modes, the rotating components of steam turbines, fans, and pumps in thermal power units undergo changes from one stable operating state to another. During the switching of operating conditions, the positions of actuators such as valves and guide vanes change, and the state of the working medium such as steam, water, or air changes accordingly. The driving force and load on the rotating components are also redistributed, so the vibration level may change significantly between two stable operating states. In the operation and maintenance of thermal power units, existing vibration monitoring devices are usually used to record shaft vibration, bearing vibration, or equipment shell vibration, and operating condition switching vibration tests are carried out in combination with operating parameters such as load, pressure, flow rate, speed, and valve position.

[0003] However, existing methods still have two limitations: First, the fact that the vibrations before and after the switch are at a stable level does not necessarily mean that there were no short-duration vibration peaks during the switch, and it is even more difficult to directly determine the actual operating state of the rotating component when the maximum vibration occurs. From a mechanistic perspective, after the control command is issued, it needs to go through the action of the executing equipment, the change of the working medium state, and the transmission of driving force or load state. The change of the executing equipment position and the actual working condition change of the rotating component are not synchronized. Second, although it is possible to return to the same equipment position when exiting the working condition switch, the working medium state and the load state of the rotating component are affected by the change direction and transmission process. The return process is not the same mechanical operation process as the initial working condition change process. Therefore, it is difficult to directly use the return process to verify the first vibration change. Summary of the Invention

[0004] In view of the problems existing in the prior art, the present invention is proposed.

[0005] Therefore, the present invention provides a vibration test method for the switching of operating conditions of rotating components of thermal power units, which solves the problem that it is difficult to accurately identify the actual operating state corresponding to the vibration change during the switching of operating conditions of rotating components of thermal power units, and that it is difficult to directly retest during the return process.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: This invention provides a vibration testing method for rotating components of a thermal power unit during operating condition switching. The method includes: collecting equipment action parameters, rotating component operating parameters, and vibration parameters under a first stable operating condition to form three parameter ranges and obtaining the operating condition switching conditions of the thermal power unit; switching to a second stable operating condition, where, when the equipment action parameters and rotating component operating parameters successively leave the same parameter range of the previous stable operating position, the moment when the rotating component operating parameters first leave the same parameter range is taken as the starting point of the actual operating condition change; when the operating condition switch reaches the stable operating condition, the three parameter ranges are re-recorded as a reference for the next operating condition change; when the vibration parameters first leave the previous stable operating condition... When determining the vibration parameter range of the operating position, the current operating position is maintained or the operating condition is exited according to the operating condition switching conditions. After maintaining the current operating position, the vibration change operating range is formed according to whether the vibration parameters re-enter the vibration parameter range of the previous stable operating position, or the operating position is exited to the last stable operating position before the vibration trigger. After exiting, the recovery status of the three types of parameters is verified in sequence. When the recovery status verification is passed and the operating condition switching conditions are still met, the test starting point is re-established, and the vibration change operating range is re-measured along the operating condition change direction of the first test. The operating condition switching vibration test result is formed based on the re-measured vibration parameters and the equipment action parameters and rotating component operating parameters at the same sampling time.

[0007] As a preferred embodiment of the vibration testing method for the switching operating conditions of rotating components in thermal power units according to the present invention, the method involves collecting equipment action parameters, rotating component operating parameters, and vibration parameters under a first stable operating condition to form three parameter ranges: the first stable operating condition is the operating state of the rotating component under test before the start of the operating condition switching, where it meets the stable operating conditions of the current operating mode; the second stable operating condition is the operating state of the rotating component under test after the operating condition switching is completed, where it meets the stable operating conditions of another operating mode; and the stable operating range of at least one equipment action parameter or rotating component operating parameter differs between the two stable operating conditions. The equipment action parameters are the parameters of the actuators... The actual mechanical motion parameters or actual position parameters, the rotating component operating parameters are at least one of the working medium parameters, load parameters, speed parameters or load state parameters, and the vibration parameters are at least one of the shaft vibration amplitude, bearing vibration amplitude or equipment housing vibration amplitude; after the first stable operating condition reaches the stable operating condition, the three types of parameters are recorded according to the same sampling time reference until the last sampling moment before switching to the second stable operating condition, and the minimum and maximum values ​​of the actual sampled values ​​of each parameter are obtained respectively. The minimum to maximum values ​​of each parameter are respectively used as the range of equipment motion parameters, the range of rotating component operating parameters and the range of vibration parameters.

[0008] As a preferred embodiment of the vibration test method for switching operating conditions of rotating components of thermal power units according to the present invention, the step of obtaining the operating condition switching conditions of the thermal power unit includes: obtaining the equipment action mode, operating condition change direction, adjustment rate requirement, and stable operating conditions when switching from the first stable operating condition to the second stable operating condition from the operating procedures, operating condition switching operation tickets, and equipment protection requirements executed by the thermal power unit; obtaining whether the current operating position can be maintained, the return path used to exit the operating condition switching, the conditions that allow the operating condition switching to be repeated, and the vibration alarm, equipment protection, and test stop conditions.

[0009] As a preferred embodiment of the vibration testing method for switching operating conditions of rotating components in thermal power units according to the present invention, the switching to the second stable operating condition includes: at the start of the operating condition switching, taking the first stable operating condition as the first preceding stable operating position, comparing the equipment action parameters with the range of equipment action parameters of the preceding stable operating position, and recording the current sampling time as the start time of the actual operation of the equipment when the equipment action parameters first leave the range of equipment action parameters; from the start time of the actual operation of the equipment, comparing the rotating component operating parameters with the range of rotating component operating parameters of the preceding stable operating position, and taking the current sampling time as the starting point of the actual operating condition change when the rotating component operating parameters first leave the range of rotating component operating parameters; when the equipment action parameters include two or more parameters, taking the sampling time of the equipment action parameter that first leaves its own parameter range as the start time of the actual operation of the equipment; when the rotating component operating parameters include two or more parameters, taking the sampling time of the rotating component operating parameter that first leaves its own parameter range as the starting point of the actual operating condition change.

[0010] As a preferred embodiment of the vibration testing method for switching operating conditions of rotating components in thermal power units according to the present invention, the re-recording of the three types of parameter ranges includes: continuing to switch from the starting point of the actual operating condition change to the second stable operating condition; when the operating state reaches the stable operating conditions, recording the three types of parameters according to the same sampling time reference to re-form the equipment action parameter range, rotating component operating parameter range, and vibration parameter range; taking the current operating state as the new previous stable operating position, and using the newly formed three types of parameter ranges as the reference for the next operating condition change; before reaching the next operating state that meets the stable operating conditions, continuing to use the three types of parameter ranges formed by the previous stable operating position as the reference for the current operating condition change.

[0011] As a preferred embodiment of the vibration testing method for switching operating conditions of rotating components of thermal power units according to the present invention, the step of "when the vibration parameter first leaves the vibration parameter range of the previous stable operating position" includes: starting from the starting point of the actual operating condition change, comparing the vibration parameters at each sampling time with the vibration parameter range formed by the previous stable operating position; when the vibration parameter first leaves its own vibration parameter range, recording the current sampling time as the vibration trigger time, and recording the equipment action parameters, rotating component operating parameters, and vibration parameters at the vibration trigger time; when the vibration parameter includes two or more parameters, the sampling time of the vibration parameter that first leaves its own vibration parameter range is taken as the vibration trigger time; the previous stable operating position used when the vibration is triggered is taken as the last stable operating position before the vibration trigger, and the three types of parameters recorded from the last stable operating position before the vibration trigger to the vibration trigger time are retained.

[0012] As a preferred embodiment of the vibration testing method for the operating condition switching of rotating components in thermal power units according to the present invention, the step of maintaining the current operating position or exiting the operating condition switching according to the operating condition switching conditions includes: when the current operating position can be maintained, stopping the continued advancement of the actuator to the second stable operating condition, maintaining the current actual position of the actuator and recording three types of parameters until the current operating state reaches the stable operating condition; when the vibration parameters re-enter the vibration parameter range of the last stable operating position before vibration triggering, taking the operating state at the beginning of the current operating condition change from the last stable operating position before vibration triggering as the starting point, and the operating state when the current maintained position reaches the stable operating condition as the ending point, a vibration change operating range is formed. For each vibration parameter that leaves its own vibration parameter range, record the maximum vibration amplitude from the first time it leaves its own vibration parameter range until it re-enters its own vibration parameter range, as well as the equipment action parameters and rotating component operating parameters at the sampling time of each maximum vibration amplitude; after forming the vibration change operating range, exit to the last stable operating position before vibration triggering according to the return path specified by the working condition switching conditions; if the vibration parameter does not re-enter the vibration parameter range after the current operating state reaches the stable operating condition, or if the current operating position cannot be maintained, exit to the last stable operating position before vibration triggering according to the return path specified by the working condition switching conditions, and retain the three types of parameters recorded during the first test.

[0013] As a preferred embodiment of the vibration testing method for switching operating conditions of rotating components in thermal power units according to the present invention, the step of sequentially verifying the recovery status of three types of parameters after exiting includes: continuing to record the three types of parameters after exiting to the last stable operating position before vibration triggering; after the current operating state reaches stable operating conditions again, first comparing the equipment action parameters with the equipment action parameter range; after all equipment action parameters have entered the equipment action parameter range, comparing the rotating component operating parameters with the rotating component operating parameter range; after all rotating component operating parameters have entered the rotating component operating parameter range, comparing the vibration parameters with the vibration parameter range; three When all parameters fall within their own parameter range formed by the last stable operating position before vibration triggering, the recovery state verification passes; when any parameter falls outside its own parameter range, the recovery state verification fails, and no local retest is performed; if no vibration change operating range is formed during the initial test, and the recovery state verification passes after exiting, the vibration change operating range is formed based on the three parameters retained during the initial test; the vibration change operating range starts from the last stable operating position before vibration triggering, and ends when the current held position reaches the stable operating condition during the hold operation, and ends when the hold operation is not performed during the hold operation, based on the operating state at the time of vibration triggering.

[0014] As a preferred embodiment of the vibration testing method for the operating condition switching of rotating components in thermal power units according to the present invention, the step of re-establishing the test starting point and re-measuring the vibration change range along the direction of the initial test includes: when the recovery state verification is passed and the operating condition switching conditions are still met, taking the last stable operating position before the vibration trigger after recovery as the test starting point, and recording three types of parameters according to the same sampling time reference; starting from the test starting point, re-measuring the vibration change range along the direction of the initial test according to the equipment action mode and adjustment rate specified by the operating condition switching conditions, until the end point of the vibration change range is reached or the operating condition switching conditions are no longer met; during the re-measuring process... The vibration parameter that first deviates from its own vibration parameter range in the initial test is compared with the vibration parameter range formed by the last stable operating position before vibration triggering. When the same vibration parameter deviates from its own vibration parameter range for the first time during the retest, the current sampling time is recorded as the retest vibration trigger time, and the three types of parameters at the current sampling time are recorded. After recording the retest vibration trigger time, the three types of parameters are recorded, and the maximum vibration amplitude of each vibration parameter during the retest is recorded respectively. At the sampling time where the maximum vibration amplitude is located, the equipment action parameters and rotating part operation parameters are recorded respectively. The retest is stopped when the vibration alarm, equipment protection, or test stop conditions are reached during the retest.

[0015] As a preferred embodiment of the vibration test method for switching operating conditions of rotating components in thermal power units according to the present invention, the step of forming the vibration test result for switching operating conditions based on the retested vibration parameters and the equipment action parameters and rotating component operating parameters at the same sampling time includes: when the same vibration parameter that first left its own vibration parameter range in the first test leaves its own vibration parameter range again in the retest, a vibration change recurrence result is formed, and the vibration change operating range and vibration change recurrence result formed in the first test are recorded in the vibration test result for switching operating conditions; the vibration trigger time for retest and the maximum vibration amplitude of each vibration parameter in the retest process are recorded, the equipment action parameters and rotating component operating parameters are recorded at the vibration trigger time for retest, and the equipment action parameters and rotating component operating parameters are recorded at the sampling time where each maximum vibration amplitude is located; when the retest reaches the end of the vibration change operating range, and the same vibration parameter that first left its own vibration parameter range in the first test does not leave its own vibration parameter range in the retest process, a vibration change non-recurrence result is formed, and the vibration change operating range and vibration change non-recurrence result formed in the first test are recorded in the vibration test result for switching operating conditions, and the three types of parameters collected in the retest process are recorded.

[0016] The beneficial effects of this invention are as follows: By comparing the device's action parameters and the operating parameters of rotating components with the range of similar parameters in the previous stable operating position, the moment when the operating parameters of the rotating components first leave the range of similar parameters is taken as the starting point of the actual operating condition change, and vibration parameters are recorded simultaneously, establishing a correspondence between vibration changes and the actual operating state of the rotating components, thus achieving accurate recording of short-term vibration changes and the actual operating conditions when the maximum vibration amplitude occurs during the operating condition switching process; by adjusting the test process according to the operating condition switching conditions after vibration is triggered, and re-establishing the test starting point after the three types of parameters recover, the operating range of vibration changes is locally retested along the direction of the operating condition change in the first test, thus achieving repeated verification of vibration changes and forming the vibration test results for operating condition switching. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a flowchart of a vibration test method for switching operating conditions of rotating components in thermal power units.

[0019] Figure 2 A flowchart for identifying the starting point of changes in actual operating conditions.

[0020] Figure 3A flowchart for defining the operating range of vibration changes and verifying the recovery status.

[0021] Figure 4 This is a flowchart for retesting the vibration variation operating range and generating vibration test results for switching operating conditions.

[0022] Figure 5 This diagram illustrates the changes in three types of parameters during the switching of operating conditions of rotating components in a thermal power unit. Detailed Implementation

[0023] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0024] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0025] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0026] Reference Figures 1-5 As one embodiment of the present invention, this embodiment provides a vibration test method for switching operating conditions of rotating components of a thermal power unit, comprising the following steps: Rotating components of thermal power units can maintain vibration stability before the switching of operating conditions and can also maintain vibration stability after the switching of operating conditions. However, between two stable operating conditions, the rotating components may experience short-term vibration changes due to changes in driving force, working medium state or load state. Therefore, comparing only the stable vibration before and after the switching of operating conditions may not reflect the actual maximum vibration that occurs during the switching of operating conditions and the operating state when the maximum vibration occurs.

[0027] Furthermore, when a thermal power unit performs a switching of operating conditions, the control command first acts on the valves, guide vanes, drive equipment, or load regulating equipment. Only after the actual action of the equipment is executed does the state of the working medium such as steam, water, and air, or the driving force and load on the rotating parts change accordingly. Therefore, there is a sequential relationship between the issuance of the control command, the execution of the actual action of the equipment, and the start of the change in the actual operating state of the rotating parts. At the same time, when the equipment changes from one operating position to another or returns from another operating position, even if the same valve opening, guide vane position, or speed occurs, the state of the working medium and the load on the rotating parts are not necessarily the same. Therefore, the actual operating condition when vibration occurs cannot be represented solely by the timing of the control command or the position displayed by a single piece of equipment.

[0028] Among them, the operating condition of rotating components of thermal power units refers to the actual operating state of rotating components formed by the driving force, load state, working medium state or operating load of rotating components during the operation of thermal power units; the switching of operating conditions of rotating components of thermal power units refers to the process of the same rotating component changing from the first stable operating condition to the second stable operating condition.

[0029] The first stable operating condition is the operating state in which the rotating components maintain operation according to the current operating requirements and reach stable operating conditions before the start of the operating condition switch; the second stable operating condition is the operating state in which the rotating components maintain operation according to another operating requirement and reach stable operating conditions after the operating condition switch is completed; the first and second stable operating conditions use the same rotating components as the test objects, and the stable operating states reflected by at least one of the equipment action parameters or rotating component operating parameters are different, so that the two stable operating conditions can be distinguished and repeatedly established according to the existing operating procedures and actual operating parameters of the thermal power unit.

[0030] For example, the switching of operating conditions of rotating components in thermal power units includes the process of increasing or decreasing load between different stable load conditions of the steam turbine, the process of switching steam distribution mode of the steam turbine, the process of switching between normal flow condition and zero output condition of the low-pressure cylinder of the steam turbine, the process of switching between different stable speed operating conditions during the speed increase or decrease of the steam turbine, and the switching of operating conditions of rotating equipment such as fans and pumps between different stable operating loads or operating modes.

[0031] To represent the actual operating state experienced by the rotating component during the switching of operating conditions, this embodiment uses equipment action parameters and rotating component operating parameters respectively. The equipment action parameters reflect the mechanical actions or position changes that have actually occurred on the executing equipment, while the rotating component operating parameters reflect the actual operating state formed by the driving force, working medium, load, speed or bearing state acting on the rotating component after the executing equipment has acted.

[0032] Among them, the actual position of the valve, the actual position of the guide vane, or the actual position of other actuators can be used; the operating parameters of the rotating parts can be pressure, flow rate, active load, speed, and on-site operating parameters related to the load state of the rotating parts.

[0033] For example, when switching between the normal flow condition and the zero output condition of the low-pressure cylinder, the equipment operation parameters can be the actual opening degree of the heating butterfly valve, and the operating parameters of the rotating parts can be the steam inlet pressure of the low-pressure cylinder; during the switching of the steam distribution mode of the steam turbine, the actual opening degree of each regulating valve and related steam parameters can be used; during the load increase and decrease of the steam turbine, the actual opening degree of the regulating valve, the active load and the main steam flow can be used; when switching between different operating loads or operating modes of rotating equipment such as fans or pumps, the actual position, speed, inlet pressure, outlet pressure or flow can be used.

[0034] Based on this, this embodiment does not directly indicate the start of a change in the operating condition of the rotating component by the moment the control command is issued. Instead, it uses the equipment action parameters and the rotating component operating parameters to identify the actual actions of the executing equipment and the actual changes in the operating state of the rotating component. It then forms three parameter ranges based on the actual operating state that has reached stable operating conditions during the operating condition switching process. When the vibration parameters leave the vibration parameter range formed by the current stable operating conditions, the test process is changed according to the on-site operating condition switching conditions. After the operating state is restored, the test is repeated along the same operating condition change direction, so that the vibration change can be related to the actual operating conditions experienced by the rotating component.

[0035] S1. Under the first stable operating condition, collect the equipment action parameters, rotating component operating parameters and vibration parameters to form three parameter ranges, and obtain the operating condition switching conditions of the thermal power unit.

[0036] Furthermore, the rotating components of the thermal power unit to be tested for vibration and the operating condition switching process are selected. After the first stable operating condition reaches the stable operating conditions specified in the existing operating procedures of the thermal power unit, the equipment action parameters directly related to the current operating condition switching, the rotating component operating parameters that can reflect the actual operating state of the rotating components to be tested, and the vibration parameters of the test location are collected, and the three types of parameters use the same sampling time reference.

[0037] Among them, the vibration parameters are measured parameters that can reflect the mechanical vibration state of the rotating parts under test, collected by the existing vibration measurement device of the thermal power unit, including at least one of shaft vibration amplitude, bearing vibration amplitude or equipment shell vibration amplitude; when different vibration measurement directions are set at the same test position, the vibration parameters are recorded for each vibration measurement direction.

[0038] Furthermore, the first stable operating condition and the second stable operating condition correspond to two stable operating states of the same rotating component under test before and after the operating condition switch. Both stable operating states meet the stable operating conditions corresponding to their respective operating modes, and the stable operating range of at least one equipment action parameter or rotating component operating parameter is different, so that the first stable operating condition and the second stable operating condition can be distinguished according to the actual operating parameters on site.

[0039] For example, in the vibration test of switching from the normal flow condition to the zero output condition of the low-pressure cylinder, the first stable operating condition is that the low-pressure cylinder operates in the normal flow mode, the actual opening of the heating butterfly valve and the steam inlet pressure of the low-pressure cylinder meet the requirements of normal flow operation, and the stable operating conditions of normal flow operation are achieved; the second stable operating condition is that the low-pressure cylinder operates in the zero output mode, the actual opening of the heating butterfly valve and the steam inlet pressure of the low-pressure cylinder meet the requirements of zero output operation, and the stable operating conditions of zero output operation are achieved.

[0040] After the first stable operating condition reaches the stable operating condition, three types of parameters are recorded. The second stable operating condition is the stable operating state that needs to be reached when switching to the current operating condition.

[0041] Furthermore, taking the switching from normal flow condition to zero output condition of low-pressure cylinder as an example, the actual opening degree of heating butterfly valve is read as the equipment action parameter, the steam inlet pressure of low-pressure cylinder is read as the operating parameter of rotating component, and the shaft vibration amplitude at the support position of low-pressure rotor is read as the vibration parameter through turbine vibration monitoring device; when two orthogonal vibration measurement directions are set at the same test position, the shaft vibration amplitude of the two vibration measurement directions is recorded respectively.

[0042] Among them, the actual opening degree of the heating butterfly valve reflects the actual mechanical position that the heating butterfly valve has reached during the switching of operating conditions; the steam inlet pressure of the low-pressure cylinder reflects the change in the actual steam inlet state of the low-pressure cylinder after the heating butterfly valve is activated; and the shaft vibration amplitude reflects the mechanical vibration response generated by the low-pressure rotor under the current actual steam inlet state. The three types of parameters are recorded according to the same sampling time reference, so that the actual action of the heating butterfly valve, the actual steam inlet state change of the low-pressure cylinder, and the vibration response of the low-pressure rotor can be established in chronological order according to the sampling time.

[0043] For switching of operating conditions of rotating components in other thermal power units, three types of parameters are selected based on the actual transmission relationship between the actual action of the executing equipment, the actual operating status change of the rotating components, and the mechanical vibration response. For switching of steam distribution mode of steam turbine, the actual opening degree of regulating valve, steam pressure or steam flow rate and steam turbine shaft vibration amplitude can be used. For load rise and fall conditions, the actual opening degree of regulating valve, active load or main steam flow rate and steam turbine shaft vibration amplitude can be used. For switching of operating conditions of rotating equipment such as fans or pumps, the actual position of guide vane, speed, inlet pressure, outlet pressure or flow rate and bearing vibration amplitude or equipment casing vibration amplitude can be used.

[0044] Furthermore, after the first stable operating condition meets the stable operating conditions, starting from the sampling time when the stable operating conditions are met, the equipment action parameters, rotating component operating parameters, and vibration parameters are recorded according to the sampling cycle adopted by the existing monitoring system of the thermal power unit until the last sampling time before the switch from the first stable operating condition to the second stable operating condition is started. The actual sampling values ​​of the three types of parameters during this stable operating process are summarized respectively.

[0045] Furthermore, the minimum and maximum values ​​of the actual sampled values ​​of each equipment action parameter, each rotating component operating parameter, and each vibration parameter are obtained respectively. The parameter range of the first stable operating condition is formed by the minimum to maximum value of each parameter, thus obtaining the equipment action parameter range, rotating component operating parameter range, and vibration parameter range. When there are different test positions or different vibration measurement directions, each test position and each vibration measurement direction forms its own vibration parameter range.

[0046] Among them, the equipment action parameter range reflects the range of mechanical positions actually maintained by the equipment under the first stable operating condition; the rotating component operation parameter range reflects the normal fluctuation range of the actual operating state of the rotating component under the first stable operating condition; and the vibration parameter range reflects the actual vibration fluctuation range formed by the rotating component under test under the first stable operating condition. All three parameter ranges are derived from the actual sampling data of the first stable operating condition and serve as a reference for judging whether the equipment action, the operating state of the rotating component, and the mechanical vibration have deviated from the current stable operating state when the operating condition is switched again.

[0047] Furthermore, from the operating procedures, operating condition switching operation tickets, and equipment protection requirements currently implemented by the thermal power unit, the equipment action mode, operating condition change direction, and adjustment rate requirements when switching from the first stable operating condition to the second stable operating condition are obtained. The stable operating conditions that each operating position needs to meet during the operating condition switching process are also obtained, as well as whether the current operating position can be maintained, the return path used when exiting, and the conditions that allow restarting the operating condition switching. At the same time, the vibration alarm, equipment protection, and test stop conditions are obtained to form the operating condition switching conditions used for the current vibration test.

[0048] Among them, the operating condition switching conditions are used to limit the on-site operations that can be performed during vibration testing. When the current operating position can be maintained, the current operating position is maintained according to the operating requirements and the three types of parameters continue to be collected. When the current operating position cannot be maintained or the operating requirements stipulate that it must be exited, the operating condition switching is exited according to the prescribed return path. The operating condition switching vibration test is allowed to be carried out again only when the stable operating conditions and operating condition switching requirements are met again. When the vibration alarm, equipment protection or test stop conditions are reached during the operating condition switching process, the corresponding operation is performed according to the existing operating requirements of the thermal power unit.

[0049] S2. Switching to the second stable operating condition: When the equipment action parameters and rotating component operating parameters leave the same parameter range of the previous stable operating position one after another, the moment when the rotating component operating parameters first leave the same parameter range is taken as the starting point of the actual operating condition change. When the operating condition switch reaches the stable operating condition, the range of the three types of parameters is re-recorded as a reference for the next operating condition change.

[0050] Furthermore, according to the working condition switching conditions, the system changes from the first stable operating condition to the second stable operating condition, and records the equipment action parameters, rotating component operating parameters, and vibration parameters according to the same sampling time reference. When the working condition switching begins, the first stable operating condition is used as the previous stable operating position, and the range of the three types of parameters already formed in the first stable operating condition is read.

[0051] Among them, the preceding stable operating position is the operating state that most recently met the stable operating conditions and formed the three parameter ranges before the current operating condition change begins; when the operating condition switch begins, the first stable operating condition is used as the first preceding stable operating position.

[0052] Furthermore, starting from the start of the operating condition switch, the device action parameters are compared with the range of device action parameters at the previous stable operating position according to the sampling time. When the device action parameters first leave the range of device action parameters at the previous stable operating position, the current sampling time is recorded as the start time of the actual device action. When the device action parameters include two or more parameters, each device action parameter is compared with its own device action parameter range, and the sampling time corresponding to the device action parameter that first leaves its own parameter range is taken as the start time of the actual device action.

[0053] It should be noted that when the device's action parameters first deviate from the range of the previous stable operating position, it indicates that the device has begun to perform actual actions. However, the changes in the working medium state, operating load, speed, or load state caused by the device's actions may not yet be reflected in the actual operating parameters of the rotating component under test. Therefore, the moment when the device actually begins to act is not taken as the starting point of the actual operating condition change.

[0054] Furthermore, starting from the moment the equipment actually begins to operate, the operating parameters of the rotating components at each sampling moment are compared with the range of operating parameters of the rotating components at the previous stable operating position. When the operating parameters of the rotating components first leave the range of operating parameters of the rotating components at the previous stable operating position, the current sampling moment is recorded, and the current sampling moment is used as the starting point of the actual operating condition change. When the operating parameters of the rotating components include more than two parameters, each operating parameter of the rotating components is compared with its own operating parameter range, and the sampling moment corresponding to the operating parameter of the rotating components that first leaves its own parameter range is used as the starting point of the actual operating condition change.

[0055] For example, when switching from the normal flow condition of the low-pressure cylinder to the zero output condition of the low-pressure cylinder, the first stable operating condition is taken as the first previous stable operating position. When the actual opening of the heating butterfly valve first leaves the range of equipment action parameters of the previous stable operating position, the start time of the actual equipment action is recorded. Then, the steam inlet pressure of the low-pressure cylinder is compared with the operating parameter range of the rotating parts of the previous stable operating position. When the steam inlet pressure of the low-pressure cylinder first leaves the operating parameter range of the rotating parts, the current sampling time is taken as the starting point of the actual operating condition change.

[0056] Furthermore, starting from the actual operating condition change point, the system continues to change towards the second stable operating condition according to the operating condition switching conditions, and records three types of parameters according to the sampling time. When the stable operating conditions are reached during the operating condition switching process, the three types of parameters are recorded during the operation process that meets the stable operating conditions, and the range of equipment action parameters, the range of rotating part operating parameters, and the range of vibration parameters are re-formed according to the established range formation method of the three types of parameters.

[0057] After recording the ranges of the three types of parameters, the current operating state is taken as the new previous stable operating position, and the newly formed ranges of the three types of parameters are used as the reference for the next change in operating conditions. When switching operating conditions, the equipment action parameters are compared with the range of equipment action parameters formed by the new previous stable operating position. When the equipment action parameters leave the range for the first time, the actual start time of the equipment action is recorded. Then, the operating parameters of the rotating parts are compared with the range of rotating parts operating parameters formed by the new previous stable operating position. When the operating parameters of the rotating parts leave the range for the first time, the current sampling time is taken as the starting point of the new actual change in operating conditions.

[0058] It should be noted that after the stable operating conditions are reached again during the switching of operating conditions, the equipment action parameters, rotating part operating parameters and vibration parameters may have formed a new stable range. Therefore, it is necessary to re-record the range of the three types of parameters and use the newly formed range of the three types of parameters as a reference for the next change of operating conditions.

[0059] Before the operating condition changes to the next stable operating state, the three parameter ranges are not re-established. Instead, the three parameter ranges formed in the previous stable operating position are used as the reference for the current operating condition change.

[0060] S3. When the vibration parameter leaves the range of the previous stable operating position for the first time, maintain the current operating position or exit the operating condition switch according to the working condition switching conditions. After maintaining the current operating position, depending on whether the vibration parameter re-enters the range of the previous stable operating position, form a vibration change operating range or exit to the last stable operating position before the vibration trigger. After exiting, verify the recovery status of the three types of parameters in sequence.

[0061] Furthermore, starting from the point of change in actual operating conditions, the vibration parameters at each sampling moment are compared with the vibration parameter range formed by the previous stable operating position. When a vibration parameter first leaves its own vibration parameter range, the current sampling moment is recorded as the vibration trigger moment. At the same time, the equipment action parameters, rotating part operating parameters, and vibration parameters at the vibration trigger moment are recorded. When the vibration parameter includes more than two parameters, each vibration parameter is compared with its own vibration parameter range, and the sampling moment of the vibration parameter that first leaves its own parameter range is taken as the vibration trigger moment.

[0062] It should be noted that when the vibration parameters deviate from the range of the previous stable operating position for the first time, it indicates that the rotating component has a vibration response different from the previous stable operating state during the current change of operating conditions. The current vibration change is used as a trigger condition for adjusting the field test process, and is not used as a result of judging the fault or fault type of the rotating component.

[0063] Furthermore, the preceding stable operating position used when the vibration is triggered is taken as the last stable operating position before the vibration is triggered, and the three types of parameters recorded from the last stable operating position before the vibration is triggered to the moment of vibration triggering are retained, so that the same stable operating state is used as a reference when performing the maintenance, exit and recovery state verification after the vibration is triggered.

[0064] After vibration is triggered, the system determines whether the current operating position can be maintained based on the operating condition switching conditions. If the current operating position can be maintained, the system stops advancing the equipment to the second stable operating condition, maintains the current actual position of the equipment, and continues to record the three types of parameters according to the same sampling time reference until the current operating state reaches the stable operating condition.

[0065] It should be noted that after maintaining the current actual position of the actuator, the operating parameters and vibration parameters of the rotating parts may continue to change. Therefore, during the maintenance period, the three types of parameters should continue to be recorded until the current operating state reaches the stable operating conditions.

[0066] Once the current operating state reaches the stable operating conditions, the vibration parameters are compared with the vibration parameter range formed by the last stable operating position before the vibration trigger. When each vibration parameter re-enters its own vibration parameter range, the operating state at the start of the current working condition change is taken as the starting point, and the operating state at the current stable operating position is taken as the ending point, forming the vibration change operating range. The three types of parameters recorded at each sampling time between the starting point and the ending point are retained.

[0067] Among them, when each vibration parameter re-enters its own vibration parameter range, the vibration change operating range represents the local operating range of the rotating component from the last stable operating position before vibration triggering along the current operating condition change direction, through the operating state corresponding to the vibration triggering time, and then reaching the stable operating condition again at the current holding position; at the same time, for each vibration parameter that leaves its own vibration parameter range, the maximum vibration amplitude that occurs from the first time leaving its own vibration parameter range to re-entering its own vibration parameter range, as well as the equipment action parameters and rotating component operating parameters at the sampling time of each maximum vibration amplitude, are recorded.

[0068] After the vibration change operating range is formed, the system exits to the last stable operating position before the vibration triggering according to the return path specified by the operating condition switching conditions, so that the local retest can start again from the stable operating state that has actually been reached before the vibration triggering.

[0069] If the current operating position is allowed to be maintained, but the vibration parameters have not yet returned to the vibration parameter range formed by the last stable operating position before the vibration trigger after the current operating state reaches the stable operating condition, the process will not continue to advance to the second stable operating condition. Instead, it will exit to the last stable operating position before the vibration trigger according to the return path specified by the operating condition switching conditions. The three types of parameters recorded when the operating state from the last stable operating position before the vibration trigger to the current maintained position reaches the stable operating condition will be retained.

[0070] When the current operating position at the time of vibration triggering is not allowed to be maintained, the holding operation is not performed. Instead, the system exits to the last stable operating position before the vibration triggering according to the return path specified by the operating condition switching conditions. The system retains the three types of parameters recorded from the last stable operating position before the vibration triggering to the time of the current operating condition change.

[0071] When vibration is triggered and the conditions for vibration alarm, equipment protection, or test stoppage are met, the operation specified in the existing operating requirements of the thermal power unit shall be performed according to the operating condition switching conditions, and the current vibration test shall be stopped.

[0072] Furthermore, after exiting to the last stable operating position before vibration triggering, three types of parameters are recorded. When the current operating state reaches the stable operating conditions of the last stable operating position before vibration triggering again, the equipment action parameters are first compared with the equipment action parameter range formed by the last stable operating position before vibration triggering. After all equipment action parameters have returned to their own parameter range, the rotating component operating parameters are then compared with the rotating component operating parameter range. After all rotating component operating parameters have returned to their own parameter range, the vibration parameters are then compared with the vibration parameter range.

[0073] When the equipment's action parameters, rotating component operating parameters, and vibration parameters sequentially re-enter their own parameter ranges formed by the last stable operating position before vibration triggering, a recovery state verification pass result is generated; if any type of parameter fails to enter its own parameter range after the current operating state has reached stable operating conditions again, a recovery state verification fail result is generated.

[0074] It should be noted that the return of the actuator to the last stable operating position before the vibration trigger does not mean that the working medium state, operating load, speed or bearing state of the rotating parts have been restored simultaneously. Therefore, the actuator's operating parameters should be verified first, followed by the rotating parts' operating parameters, and finally the vibration parameters. This ensures that the restoration status verification is carried out according to the actual process of the actuator returning, the actual operating state of the rotating parts being restored, and the mechanical vibration being restored.

[0075] When the vibration parameters do not re-enter the vibration parameter range after maintaining the current operating position, or when the current operating position is not allowed to be maintained when the vibration is triggered, but the recovery state verification after exiting passes, the vibration change operating range for local retesting is formed based on the three types of parameters retained in the first test, taking the last stable operating position before the vibration trigger as the starting point and the farthest operating state reached in the first test as the ending point. When the holding operation is performed, the operating state when the current holding position reaches the stable operating condition is taken as the farthest operating state reached in the first test. When the holding operation is not performed, the operating state at the time of vibration triggering is taken as the farthest operating state reached in the first test. The vibration change operating range formed in the first test all start from the last stable operating position before the vibration trigger and end from the farthest operating state actually reached in the direction of change of the current working condition in the first test. The end point of the vibration change operating range is jointly represented by the equipment action parameters and rotating component operating parameters recorded at the end sampling time.

[0076] If the recovery status verification fails, the test conditions for continuing the local retest will not be formed, and the vibration trigger time, the three types of parameters recorded during the first test, and the recovery status verification results will be retained.

[0077] Reference Figure 5Taking the transition from normal flow condition to zero output condition of the low-pressure cylinder as an example, the actual opening degree of the heating butterfly valve is used as the equipment action parameter, the steam inlet pressure of the low-pressure cylinder is used as the operating parameter of the rotating parts, and the vibration amplitude of the low-pressure rotor shaft is used as the vibration parameter, all recorded according to the same sampling time benchmark. After the start of the condition transition, when the actual opening degree of the heating butterfly valve first leaves the range of the equipment action parameters, the start time of the actual equipment action is recorded. Subsequently, when the steam inlet pressure of the low-pressure cylinder first leaves the range of the operating parameters of the rotating parts, the starting point of the actual condition change is formed. From the starting point of the actual condition change, the vibration amplitude of the low-pressure rotor shaft continues to be recorded. When the vibration amplitude of the low-pressure rotor shaft first leaves its own vibration parameter range, the vibration trigger time is recorded, and the sampling time of the maximum vibration amplitude is recorded during the subsequent vibration change process. In this way, the actual action of the heating butterfly valve, the actual steam inlet state change of the low-pressure cylinder, and the vibration change of the low-pressure rotor can be recorded according to the sampling time.

[0078] S4. When the recovery status verification is passed and the working condition switching conditions are still met, the test starting point is re-established, and the vibration change range is re-measured along the working condition change direction of the first test. The working condition switching vibration test results are formed based on the re-measured vibration parameters and the equipment action parameters and rotating component operation parameters at the same sampling time.

[0079] Furthermore, after the recovery status verification is passed, the current operating conditions are verified again to see if the working condition switching conditions are met. When the working condition switching can still be performed according to the existing operating requirements, the last stable operating position before the vibration trigger after recovery is taken as the test starting point, and the equipment action parameters, rotating part operating parameters and vibration parameters are recorded according to the same sampling time reference.

[0080] Among them, re-establishing the test starting point means that after the rotating component returns to the last stable operating position before the vibration trigger and completes the recovery state verification, the local retest starts again from the last stable operating position before the vibration trigger, so that both the first test and the retest start from the same stable operating state and change towards the end point of the vibration change operating range.

[0081] Furthermore, starting from the test start point, according to the equipment action mode and adjustment rate specified by the working condition switching conditions, the working condition change direction is repeated along the working condition change direction from the last stable operating position before vibration triggering to the end of the vibration change operating range. Three types of parameters are recorded according to the sampling time, and the equipment action parameters, rotating part operating parameters and the corresponding parameters at the end of the vibration change operating range are compared respectively. When each parameter reaches or exceeds the recorded value corresponding to the end sampling time along the current working condition change direction, the end of the vibration change operating range is determined to have been reached. When the working condition switching conditions require stopping the current retest, the retest is stopped.

[0082] It should be noted that the return process from the last stable operating position before vibration triggering is not considered a retest process. The local retest is still carried out in the direction of the operating condition change of the first test, so that the action of the actuator, the actual operating state change of the rotating parts and the vibration response occur again in the same direction of change as the first test, so as to avoid taking the vibration response formed during the return process as a duplicate of the first test result.

[0083] Furthermore, during the retest, the vibration parameter that first leaves its own vibration parameter range in the initial test is compared with the corresponding vibration parameter range formed by the last stable operating position before vibration triggering. When the same vibration parameter leaves its own vibration parameter range for the first time during the retest, the current sampling time is recorded as the retest vibration trigger time. At the same time, the equipment action parameters, rotating part operating parameters, and vibration parameters at the retest vibration trigger time are recorded. The retest vibration trigger time is used to indicate the time when the same vibration parameter that first leaves its own vibration parameter range in the initial test leaves its own vibration parameter range again during the retest.

[0084] After recording the vibration trigger time for the retest, continue recording the three types of parameters within the vibration change operating range until the end of the vibration change operating range is reached or the operating condition switching condition requires stopping the current retest. Record the maximum vibration amplitude of each vibration parameter during the retest process, as well as the equipment action parameters and rotating component operating parameters at the sampling time of each maximum vibration amplitude.

[0085] When the same vibration parameter that first leaves its own vibration parameter range in the initial test leaves its own vibration parameter range again during the retest before reaching the end of the vibration change range, a result of repeated vibration change is formed. The vibration change range formed in the initial test, the vibration trigger time of the retest, and the maximum vibration amplitude of each vibration parameter during the retest are recorded together. At the same time, the equipment action parameters and rotating component operation parameters at the vibration trigger time of the retest, as well as the equipment action parameters and rotating component operation parameters at the sampling time of each maximum vibration amplitude, are recorded to form the vibration test result of the working condition switching.

[0086] When the retest reaches the end of the vibration change operating range, the same vibration parameter that first left its own vibration parameter range in the first test has never left the own vibration parameter range formed by the last stable operating position before the vibration trigger, resulting in the vibration change not repeating. The vibration change operating range formed in the first test, the vibration change not repeating result, and the three types of parameters recorded in the retest are recorded together as the working condition switching vibration test result, and the local retest is not repeated.

[0087] For example, in the partial retest of switching from the normal flow condition of the low-pressure cylinder to the zero output condition of the low-pressure cylinder, the last stable operating position before the vibration trigger after recovery is taken as the test starting point. The operating condition switch is re-executed according to the change direction of the actual opening of the heating butterfly valve during the first test, and the actual opening of the heating butterfly valve, the steam pressure of the low-pressure cylinder and the vibration amplitude of the low-pressure rotor shaft are recorded simultaneously. When the shaft vibration amplitude leaves the vibration parameter range again within the vibration change operating range, the current actual opening of the heating butterfly valve, the steam pressure of the low-pressure cylinder and the shaft vibration amplitude are recorded, and the recording continues until the end of the vibration change operating range or the conditions for stopping the retest are met.

[0088] The vibration test results during the working condition switching are used to record whether the vibration change occurs repeatedly in the local retest in the same working condition change direction, as well as the actual position of the equipment and the actual operating state of the rotating parts when the vibration is triggered and the maximum vibration amplitude occurs, so that the vibration change that occurs during the working condition switching process can be saved together with the actual operating parameters at the same sampling time.

[0089] If vibration alarm, equipment protection, or test stop conditions are reached during the retest, the operation specified in the existing operating requirements of the thermal power unit shall be performed in accordance with the operating condition switching conditions, the current retest shall be stopped, and the three types of parameters recorded before the retest was stopped and the operating status at the time of the retest stop shall be retained.

[0090] If the recovery status verification passes but the current operating conditions no longer meet the conditions for switching operating conditions, no partial retest will be conducted. The initial test record and the recovery status verification results will be retained, and the vibration test for switching current operating conditions will be terminated.

[0091] Therefore, without exceeding the existing operating condition switching conditions and protection requirements of thermal power units, it is possible to record the vibration changes during the operating condition switching process, as well as the equipment action parameters and rotating component operating parameters when the maximum vibration amplitude occurs.

[0092] In summary, this invention compares the device's action parameters and the operating parameters of rotating components with the range of similar parameters from the previous stable operating position. The moment when the operating parameters of the rotating components first deviate from the range of similar parameters is taken as the starting point of the actual operating condition change. Vibration parameters are recorded simultaneously, establishing a correspondence between vibration changes and the actual operating state of the rotating components. This achieves accurate recording of short-term vibration changes during operating condition switching and the actual operating condition when the maximum vibration amplitude occurs. Furthermore, by adjusting the test process according to the operating condition switching conditions after vibration is triggered, and re-establishing the test starting point after the three types of parameters recover, the vibration change operating range is locally retested along the direction of the first test's operating condition change, thus achieving repeated verification of vibration changes and forming vibration test results for operating condition switching.

[0093] It should be noted that 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 preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A vibration test method for switching operating conditions of rotating components in a thermal power unit, characterized in that, include: Under the first stable operating condition, the equipment action parameters, rotating component operation parameters and vibration parameters are collected to form three types of parameter ranges, and the operating condition switching conditions of the thermal power unit are obtained. When switching to the second stable operating condition, if the equipment action parameters and the rotating part operating parameters leave the same parameter range of the previous stable operating position one after another, the moment when the rotating part operating parameters first leave the same parameter range is taken as the starting point of the actual operating condition change. When the operating condition switch reaches the stable operating condition, the range of the three types of parameters is re-recorded as a reference for the next operating condition change. When the vibration parameter first leaves the range of the vibration parameter of the previous stable operating position, the current operating position is maintained or the operating condition is exited according to the working condition switching conditions. After maintaining the current operating position, the vibration change operating range is formed or the operation is exited to the last stable operating position before the vibration is triggered, depending on whether the vibration parameter re-enters the range of the vibration parameter of the previous stable operating position. After exiting, the recovery status of the three types of parameters is verified in sequence. When the recovery status verification is passed and the working condition switching conditions are still met, the test starting point is re-established, and the vibration change range is re-measured along the working condition change direction of the first test. The working condition switching vibration test results are formed based on the re-measured vibration parameters and the equipment action parameters and rotating component operation parameters at the same sampling time.

2. The vibration test method for switching operating conditions of rotating components in thermal power units as described in claim 1, characterized in that, The process involves collecting equipment motion parameters, rotating component operating parameters, and vibration parameters under the first stable operating condition, forming three parameter ranges, including: The first stable operating condition is the operating state of the rotating component under test before the start of the operating condition switch, which meets the stable operating conditions of the current operating mode. The second stable operating condition is the operating state of the rotating component under test after the operating condition switch is completed, which meets the stable operating conditions of another operating mode. The stable operating range of at least one equipment action parameter or rotating component operating parameter is different in the two stable operating conditions. The equipment action parameters are the actual mechanical action parameters or actual position parameters of the executing equipment; the rotating part operation parameters are at least one of the working medium parameters, load parameters, speed parameters or load state parameters; and the vibration parameters are at least one of the shaft vibration amplitude, bearing vibration amplitude or equipment housing vibration amplitude. After the first stable operating condition is reached, three types of parameters are recorded according to the same sampling time reference until the last sampling moment before switching to the second stable operating condition. The minimum and maximum values ​​of the actual sampled values ​​of each parameter are obtained respectively. The minimum to maximum values ​​of each parameter are used as the range of equipment action parameters, the range of rotating component operating parameters, and the range of vibration parameters.

3. The vibration test method for switching operating conditions of rotating components in thermal power units as described in claim 2, characterized in that, The conditions for obtaining the operating condition switching of the thermal power unit include: From the operating procedures, operating condition switching operation tickets and equipment protection requirements implemented by the thermal power units, obtain the equipment operation mode, operating condition change direction, adjustment rate requirements and stable operating conditions when switching from the first stable operating condition to the second stable operating condition; It obtains whether the current operating position can be maintained, the return path used to exit the operating condition switch, the conditions under which the operating condition switch can be restarted, as well as the conditions for vibration alarm, equipment protection, and test stop.

4. The vibration test method for switching operating conditions of rotating components in thermal power units as described in claim 2, characterized in that, The switch to the second stable operating condition includes: When the working condition switch begins, the first stable operating condition is taken as the first previous stable operating position. The equipment action parameters are compared with the range of equipment action parameters of the previous stable operating position. When the equipment action parameters leave the range of equipment action parameters for the first time, the current sampling time is recorded as the actual start time of the equipment action. From the moment the equipment actually starts operating, the operating parameters of the rotating parts are compared with the range of operating parameters of the rotating parts at the previous stable operating position. When the operating parameters of the rotating parts first leave the range of operating parameters of the rotating parts, the current sampling moment is taken as the starting point of the actual working condition change. When the equipment action parameters include two or more parameters, the sampling time of the equipment action parameter that first leaves its own parameter range shall be taken as the actual start time of the equipment action; when the rotating part operation parameters include two or more parameters, the sampling time of the rotating part operation parameter that first leaves its own parameter range shall be taken as the starting point of the actual working condition change.

5. The vibration test method for switching operating conditions of rotating components in thermal power units as described in claim 3 or 4, characterized in that, The re-recording of three types of parameter ranges includes: From the starting point of the actual operating condition change, continue to switch to the second stable operating condition. When the operating state reaches the stable operating condition, record three types of parameters according to the same sampling time benchmark, and re-form the equipment action parameter range, rotating part operating parameter range and vibration parameter range. The current operating state is taken as the new preceding stable operating position, and the newly formed range of three types of parameters is used as the reference for the next change in operating conditions. Before reaching the next operating state that meets the stable operating conditions, the range of three types of parameters formed by the preceding stable operating position continues to be used as the reference for the change in current operating conditions.

6. The vibration test method for switching operating conditions of rotating components in thermal power units as described in claim 5, characterized in that, When the vibration parameters first deviate from the range of vibration parameters at the previous stable operating position, it includes: Starting from the point of change in actual working conditions, the vibration parameters at each sampling time are compared with the vibration parameter range formed by the previous stable operating position. When the vibration parameter first leaves its own vibration parameter range, the current sampling time is recorded as the vibration trigger time, and the equipment action parameters, rotating part operation parameters and vibration parameters at the vibration trigger time are recorded. When the vibration parameters include two or more parameters, the sampling time of the vibration parameter that first leaves its own vibration parameter range shall be taken as the vibration trigger time; the previous stable operating position used when the vibration is triggered shall be taken as the last stable operating position before the vibration trigger, and the three types of parameters recorded from the last stable operating position before the vibration trigger to the vibration trigger time shall be retained.

7. The vibration test method for switching operating conditions of rotating components in thermal power units as described in claim 6, characterized in that, The step of maintaining the current operating position or exiting the operating condition switch based on the operating condition switch conditions includes: When the current operating position can be maintained, stop advancing the execution equipment to the second stable operating condition, maintain the current actual position of the execution equipment and record the three types of parameters until the current operating state reaches the stable operating condition; When the vibration parameters re-enter the vibration parameter range of the last stable operating position before vibration triggering, the operating state at the start of the current working condition change at the last stable operating position before vibration triggering is taken as the starting point, and the operating state when the current holding position reaches the stable operating condition is taken as the ending point, forming the vibration change operating range; for each vibration parameter that leaves its own vibration parameter range, the maximum vibration amplitude from the first time leaving its own vibration parameter range to re-entering its own vibration parameter range, as well as the equipment action parameters and rotating component operating parameters at the sampling time of each maximum vibration amplitude, are recorded respectively; After the vibration change operating range is formed, exit to the last stable operating position before vibration triggering according to the return path specified by the working condition switching conditions; if the vibration parameters do not re-enter the vibration parameter range after the current operating state reaches the stable operating conditions, or if the current operating position cannot be maintained, exit to the last stable operating position before vibration triggering according to the return path specified by the working condition switching conditions, and retain the three types of parameters recorded during the first test.

8. The vibration test method for switching operating conditions of rotating components in thermal power units as described in claim 7, characterized in that, After exiting, the recovery status of three types of parameters is verified sequentially, including: After exiting to the last stable operating position before vibration triggering, continue recording three types of parameters. After the current operating state reaches the stable operating conditions again, first compare the equipment action parameters with the equipment action parameter range; after all equipment action parameters have entered the equipment action parameter range, compare the rotating component operating parameters with the rotating component operating parameter range; after all rotating component operating parameters have entered the rotating component operating parameter range, compare the vibration parameters with the vibration parameter range. When all three types of parameters fall within their own parameter range formed by the last stable operating position before vibration triggering, the recovery state verification is passed; when any one type of parameter does not fall within its own parameter range, the recovery state verification fails and no local retest is performed. If no vibration change operating range is formed during the initial test, and the recovery status verification after exiting is passed, the vibration change operating range is formed based on the three types of parameters retained in the initial test. The vibration change operating range starts from the last stable operating position before vibration triggering, and ends when the holding operation is performed, with the operating state when the current holding position reaches the stable operating condition as the endpoint. If the holding operation is not performed, the operating state at the time of vibration triggering is the endpoint.

9. The vibration test method for switching operating conditions of rotating components in thermal power units as described in claim 8, characterized in that, The process of re-establishing the test starting point and re-measuring the vibration change range along the direction of the initial test's operating condition includes: When the recovery status verification is passed and the working condition switching conditions are still met, the last stable operating position before the vibration trigger after recovery is taken as the test starting point, and three types of parameters are recorded according to the same sampling time benchmark. Starting from the test start point, according to the equipment action mode and adjustment rate specified by the working condition switching conditions, the vibration change operating range is retested along the working condition change direction of the first test until the end point of the vibration change operating range is reached or the working condition switching conditions are no longer met. During the retest, the vibration parameter that first leaves its own vibration parameter range in the first test is compared with the vibration parameter range formed by the last stable operating position before the vibration is triggered. When the same vibration parameter leaves its own vibration parameter range for the first time during the retest, the current sampling time is recorded as the retest vibration trigger time, and the three types of parameters at the current sampling time are recorded. After recording the vibration trigger time for the retest, continue to record the three types of parameters, and record the maximum vibration amplitude of each vibration parameter during the retest process. Record the equipment action parameters and rotating component operation parameters at the sampling time of each maximum vibration amplitude. Stop the retest when the vibration alarm, equipment protection, or test stop conditions are met during the retest process.

10. The vibration test method for switching operating conditions of rotating components in thermal power units as described in claim 9, characterized in that, The vibration test results for switching operating conditions are formed based on the re-measured vibration parameters and the equipment action parameters and rotating component operating parameters at the same sampling time, including: When the same vibration parameter that first leaves its own vibration parameter range in the first test leaves its own vibration parameter range again in the retest, the vibration change repeats. The vibration change range formed in the first test and the vibration change repeats are recorded in the working condition switching vibration test results. Record the trigger time of the retest vibration and the maximum vibration amplitude of each vibration parameter during the retest process. Record the equipment action parameters and rotating component operation parameters at the trigger time of the retest vibration. Record the equipment action parameters and rotating component operation parameters at the sampling time of each maximum vibration amplitude. When the vibration change reaches the end of the operating range during the retest, and the same vibration parameter that first left its own vibration parameter range in the first test never left its own vibration parameter range during the retest, a result of vibration change not repeating is formed. The operating range of vibration change and the result of vibration change not repeating formed in the first test are recorded in the vibration test results of the working condition switching, and the three types of parameters collected during the retest are also recorded.

Images