In-core component non-contact vibration simulation experiment device and experiment method thereof

Abstract

The application discloses a non-contact vibration simulation experiment device for in-pile components and an experiment method thereof. Firstly, vibration characteristics of the in-pile components are analyzed, and the direction, vibration frequency and vibration amplitude of abnormal vibration signals are analyzed out. Secondly, the vibration signals are decomposed in the abnormal simulation experiment device to obtain signal application in the abnormal simulation device. The abnormal simulation experiment device is calibrated and abnormal simulation experiment is carried out. The abnormal simulation device is placed in an in-pile environment to carry out in-pile environment abnormal vibration experiment, a mapping relationship between a vibration spectrum characteristic set and a neutron signal is researched, and an abnormal simulation method based on the in-pile components is provided. The application provides the in-pile abnormal vibration signals without constructing a real in-pile fault environment, provides technical support for in-pile fault diagnosis, and vibration signals are convenient to control without being limited by a narrow space environment in the in-pile.

Description

Technical Field

[0001] This invention relates to a non-contact vibration simulation experimental device for in-core components and its experimental method. Background Technology

[0002] Reactor internals are prone to abnormal vibration failures such as loosening under long-term high temperature and flow-induced vibration. In order to realize the fault diagnosis of reactor internals, it is necessary to provide a fault environment of abnormal vibration of internals. However, the actual internal fault environment of the components is costly and dangerous. Summary of the Invention

[0003] In order to overcome the shortcomings of the existing technology, the present invention aims to provide a non-contact vibration simulation experimental device and experimental method for in-core components.

[0004] The technical solution provided by the present invention to solve the above-mentioned technical problems is: a non-contact vibration simulation experimental device for in-core components, including a hollow steel ball, a fixed frame, and X-direction exciter groups, Y-direction exciter groups, and Z-direction exciter groups arranged on the fixed frame, wherein the hollow steel ball is located at the center of the X-direction exciter groups, Y-direction exciter groups, and Z-direction exciter groups.

[0005] A further technical solution is that the X-direction exciter group includes X-direction exciter I and X-direction exciter II arranged opposite each other in the X direction.

[0006] A further technical solution is that the Y-direction exciter group includes Y-direction exciter I and Y-direction exciter II arranged opposite each other in the Y direction.

[0007] A further technical solution is that the Z-direction exciter group includes Z-direction exciter I and Z-direction exciter II arranged opposite each other in the Z direction.

[0008] A non-contact vibration simulation experimental method for in-core components specifically includes the following steps:

[0009] Step 1: Obtain several abnormal vibration signals of the internal components of the reactor and the abnormal vibration fault corresponding to each abnormal vibration signal. Then, analyze the vibration characteristics of each abnormal vibration signal to determine its direction, vibration frequency, and vibration amplitude.

[0010] Step 2: Decompose each abnormal vibration signal in the abnormal vibration simulation experimental device to determine the specific signal applied to each abnormal vibration signal in the non-contact vibration simulation experimental device of the internal components of the stack.

[0011] Step 3: Set different vibration amplitudes and frequencies, compare the abnormal simulation signals with the signals generated by the abnormal motion simulation experimental device, and calibrate the non-contact vibration simulation experimental device for the internal components of the reactor.

[0012] Step 4: Place the non-contact vibration simulation experimental device for in-core components in the in-core environment, and conduct abnormal vibration experiments in the in-core environment according to the signals corresponding to each abnormal vibration fault to obtain neutron signals and determine the mapping relationship between each abnormal vibration fault and the neutron signal.

[0013] A further technical solution is that the specific process of step one is as follows: considering the high temperature and flow-induced vibration factors inside the reactor, a dynamic analysis model of the vibration of the reactor components under the multi-field coupling of flow, heat and solid is established, the vibration behavior characteristics of the reactor components under the multi-field coupling condition are analyzed, the time-frequency domain characteristics of the abnormal vibration of the reactor components are analyzed, and the vibration direction, vibration period and vibration amplitude of the abnormal vibration of the reactor components are obtained.

[0014] A further technical solution is that the specific process of step two is as follows:

[0015] Based on the vibration direction and period ω of the internal components obtained from the pile, T and vibration amplitude A T Considering the constraints of a confined space, the direction is decomposed along the X, Y, and Z directions of the experimental setup; where the angle between the simulated vibration T and the X direction is α, and the amplitude in the X direction is A. T cosα; The simulated vibration T makes an angle β with the Y direction, and the amplitude in the Y direction is A. T cosβ; The simulated vibration T makes an angle γ with the Z direction, and the amplitude in the Z direction is A. T cosγ;

[0016] Based on the decomposition results and the performance of the vibration simulation device, we have:

[0017]

[0018]

[0019]

[0020] Therefore, the forces in the X, Y, and Z directions are:

[0021]

[0022]

[0023]

[0024] According to ω x =ω y =ω z =ω T We can obtain:

[0025] X-direction exciter I and X-direction exciter II input signals with the same phase and frequency, which makes:

[0026]

[0027] The Y-direction exciter I and Y-direction exciter II receive signals with the same phase and frequency, which makes:

[0028]

[0029] The Z-direction exciter I and Z-direction exciter II receive signals with the same phase and frequency, which makes:

[0030]

[0031] In the formula: The magnetic force exerted by the Z-direction exciter I on the hollow steel ball; The magnetic force exerted by the Z-direction exciter II on the hollow steel ball.

[0032] A further technical solution is that the specific process of step three is as follows:

[0033] The non-contact vibration simulation experimental device for in-core components is placed in the reactor environment. A controller or signal generator is used to input signals to six exciters to generate excitation force, thereby driving the hollow steel ball to vibrate.

[0034] The time-domain vibration signal of the excited blade is measured using a laser vibration meter. The vibration test results are compared with the signals of the controller or signal generator to calibrate the experimental device.

[0035] The present invention has the following advantages: it provides abnormal vibration signals during in-pile construction without requiring the construction of a real in-pile fault environment, thus providing technical support for fault diagnosis during in-pile construction; at the same time, it is not limited by the narrow space environment inside the in-pile, and the vibration signals are easy to control. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the structure of the present invention;

[0037] Figure 2 This is a schematic diagram of the structure of a hollow steel sphere;

[0038] Figure 3 A schematic diagram of the X-direction exciter assembly;

[0039] Figure 4 This is a schematic diagram of the structure of the exciter assembly in the Y direction;

[0040] Figure 5 This is a schematic diagram of the Z-direction exciter assembly.

[0041] Figure 6 This is a decomposition diagram of the vibration signal. Implementation

[0042] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. 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.

[0043] like Figure 1 As shown, a non-contact vibration simulation experimental device for in-core components according to the present invention includes a hollow steel ball 2, a fixed frame 1, and X-direction exciter groups, Y-direction exciter groups, and Z-direction exciter groups arranged on the fixed frame. The hollow steel ball 2 is located at the center of the X-direction exciter groups, Y-direction exciter groups, and Z-direction exciter groups. The X-direction exciter group includes X-direction exciter I3 and X-direction exciter II4 arranged opposite each other in the X direction. The Y-direction exciter group includes Y-direction exciter I5 and Y-direction exciter II6 arranged opposite each other in the Y direction. The Z-direction exciter group includes Z-direction exciter I7 and Z-direction exciter II8 arranged opposite each other in the Z direction.

[0044] This experimental setup was used in water for the experiment, in which the hollow steel sphere 2 vibrated under the influence of gravity, buoyancy, and magnetic forces in the X, Y, and Z directions. The amplitude and frequency of the vibration in the X, Y, and Z directions were determined by the resultant force F in these three directions. X F Y F Z and vibration frequency ω X ω Y ω Z Decide.

[0045] When ω X ≠ω Y ω Y ≠ω Z At that time, the vibration of the hollow steel ball 2 can be decomposed into three independent vibrations in three directions;

[0046] When ω X =ω Y =ω Z At that time, the vibration of the hollow steel ball 2 is a composite vibration in three directions, and its vibration direction is determined by F. X F Y F Z The size relationship between them determines the outcome.

[0047] When ω X =ω Y ≠ω ZAt that time, the vibration of the hollow steel ball 2 is a combined vibration in the XY direction and a separate vibration in the Z direction;

[0048] When ω X ≠ω Y =ω Z At that time, the vibration of the hollow steel ball 2 is a combined vibration in the YZ direction and a separate vibration in the X direction;

[0049] When ω X =ω Z ≠ω Y At that time, the vibration of the hollow steel ball 2 is a combined vibration in the XZ direction and a separate vibration in the Y direction;

[0050] like Figure 2 As shown, let the mass of the hollow steel sphere be m, its weight be G = mg, and the buoyant force it experiences on its internal environment be F. 浮 In the underwater environment inside the reactor, the transmission steel ball satisfies the condition that its weight G is equal to its buoyancy F. 浮 ;

[0051] like Figure 3 As shown, both X-direction vibrator I3 and X-direction vibrator II4 exert magnetic force on the hollow steel ball 2.

[0052] Let the magnetic force exerted by the X-direction exciter I3 on ​​the hollow steel ball 2 be... The magnetic force exerted by the X-direction exciter II4 on the hollow steel ball 2 is as follows:

[0053] When the vibration frequency in the X direction is ω X ;

[0054] Satisfying again:

[0055] The period of vibration in the X direction is

[0056] vibration amplitude

[0057] Furthermore, the X-direction exciter I3 and the X-direction exciter II4 are in phase synchronization.

[0058] like Figure 4 As shown, both the Y-direction exciter I5 and the Y-direction exciter II6 exert magnetic force on the hollow steel ball 2.

[0059] Let the magnetic force exerted by the Y-direction exciter I5 on the hollow steel ball 2 be... The magnetic force exerted by the Y-direction exciter II6 on the hollow steel ball 2 is as follows:

[0060] When the vibration frequency in the Y direction is ω Y ;

[0061] Satisfying again:

[0062] The vibration period in the Y direction is

[0063] vibration amplitude

[0064] Furthermore, the phase synchronization of Y-direction exciter I5 and Y-direction exciter II6 is satisfied here;

[0065] like Figure 5 As shown, both the Z-direction exciter I7 and the Z-direction exciter II8 exert magnetic force on the hollow steel ball 2.

[0066] Let the magnetic force exerted by the Z-direction exciter I7 on the hollow steel ball 2 be... The magnetic force exerted by the Z-direction exciter II8 on the hollow steel ball 2 is as follows:

[0067] When the vibration frequency in the Z direction is ω Z ;

[0068] Satisfying again:

[0069] The vibration period in the Z direction is

[0070] vibration amplitude

[0071] Furthermore, the phase synchronization of exciter I7 and exciter II8 in the Z direction is satisfied here;

[0072] A non-contact vibration simulation test method for in-core components, employing the aforementioned non-contact vibration simulation test device for in-core components, specifically includes the following steps:

[0073] Step 1: Obtain several abnormal vibration signals of the internal components of the reactor and the abnormal vibration fault corresponding to each abnormal vibration signal. Then, analyze the vibration characteristics of each abnormal vibration signal to determine its direction, vibration frequency and vibration amplitude.

[0074] Considering factors such as high temperature and flow-induced vibration inside the reactor, a dynamic analysis model of the vibration of reactor components under the coupling of multiple fields such as flow field, temperature field, and structural field is established. The vibration behavior characteristics of reactor components under multi-field coupling are analyzed, the time-frequency domain characteristics of abnormal vibration of reactor components are analyzed, and the vibration direction, vibration period and vibration amplitude of abnormal vibration of reactor components are obtained.

[0075] Step 2: Decompose each abnormal vibration signal in the abnormal vibration simulation experimental device to determine the specific signal applied to each abnormal vibration signal in the non-contact vibration simulation experimental device of the internal components of the stack.

[0076] Based on the obtained vibration direction T and vibration period ω of the in-core components T and vibration amplitude A T Considering the constraints of a confined space, its direction is decomposed into the X, Y, and Z directions of the experimental setup; for example... Figure 6 As shown, the simulated vibration T makes an angle α with the X direction, and the amplitude in the X direction is A. T cosα; The simulated vibration T makes an angle β with the Y direction, and the amplitude in the Y direction is A. T cosβ; The simulated vibration T makes an angle γ with the Z direction, and the amplitude in the Z direction is A. T cosγ;

[0077] Based on the decomposition results and the performance of the vibration simulation device, we have:

[0078]

[0079]

[0080]

[0081] Therefore, the forces in the X, Y, and Z directions are:

[0082]

[0083]

[0084]

[0085] According to ω x =ω y =ω z =ω T We can obtain:

[0086] X-direction exciter I3 and X-direction exciter II4 input signals with the same phase and frequency, so that:

[0087]

[0088] The Y-direction exciter I5 and Y-direction exciter II6 input signals with the same phase and frequency make:

[0089]

[0090] The Z-direction exciter I7 and Z-direction exciter II8 input signals with the same phase and frequency make:

[0091]

[0092] In the formula: The magnetic force exerted by the Z-direction exciter I on the hollow steel ball; The magnetic force exerted by the Z-direction exciter II on the hollow steel ball;

[0093] When the vibration direction of a certain abnormal vibration signal forms an angle of 30°, 45°, and 60° with the X, Y, and Z directions, the vibration frequency is 1000Hz, the vibration amplitude is 0.1mm, and the mass of the steel ball is 20g.

[0094] At this moment, the vibration simulation device applies the following force to the steel ball in the X direction using exciters I and II:

[0095]

[0096] The force applied to the steel ball by vibrators I and II in the Y direction is:

[0097] The force applied to the steel ball by exciters I and II in the Z direction is:

[0098] Then, in the specific experiment, the signal is applied according to the applied force after the above decomposition.

[0099] Step 3: Set different vibration amplitudes and frequencies, compare the abnormal simulation signals with the signals generated by the abnormal motion simulation experimental device, and calibrate the non-contact vibration simulation experimental device for the internal components of the reactor.

[0100] The aberration simulation device is placed in a reactor environment. A controller or signal generator inputs signals to six exciters, generating excitation forces that drive the hollow steel balls to vibrate. To obtain more accurate vibration frequency and amplitude, the vibration of the hollow steel balls needs to be calibrated. During calibration, a laser vibrometer is used to measure the time-domain vibration signal of the exciter blades. The vibration test results are compared with the controller or signal generator signals to calibrate the experimental setup and ensure the accuracy and repeatability of the exciter blade vibration signal.

[0101] Step 4: Place the non-contact vibration simulation experimental device for in-core components in the in-core environment, and conduct abnormal vibration experiments in the in-core environment according to the signals corresponding to each abnormal vibration fault to obtain neutron signals and determine the mapping relationship between each abnormal vibration fault and the neutron signal.

[0102] Based on the experimental test results, a vibration spectrum feature set of time-domain and frequency-domain characteristic parameters of the reactor internal components is constructed. The signal application in step two is set to simulate the non-contact vibration of the reactor internal components using an experimental device. At the same time, a neutron noise detector is used to detect neutron noise signals such as self-power spectral density, cross-power spectral density, coherence, and phase caused by the vibration of hollow steel balls in the reactor, thereby obtaining the neutron signal corresponding to each applied signal. Subsequently, an evaluation model of the simulated vibration of the reactor internal components based on neutron noise technology is constructed to characterize the mapping relationship between the vibration spectrum feature set of the experimental device and the neutron signal.

[0103] The above description is not intended to limit the present invention in any way. Although the present invention has been disclosed through the above embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the present invention shall still fall within the scope of the present invention.

Claims

1. A non-contact vibration simulation experimental method for in-core components, characterized in that, A non-contact vibration simulation experimental device for in-core components is adopted, including a hollow steel ball, a fixed frame, and X-direction exciter groups, Y-direction exciter groups, and Z-direction exciter groups set on the fixed frame. The hollow steel ball is located at the center of the X-direction exciter groups, Y-direction exciter groups, and Z-direction exciter groups. Specifically, the following steps are included: Step 1: Obtain several abnormal vibration signals of the internal components of the reactor and the abnormal vibration fault corresponding to each abnormal vibration signal. Then, analyze the vibration characteristics of each abnormal vibration signal to determine its direction, vibration frequency and vibration amplitude. Step 2: Decompose each abnormal vibration signal in the abnormal vibration simulation experimental device to determine the specific signal applied to each abnormal vibration signal in the non-contact vibration simulation experimental device of the internal components of the stack. Based on the vibration direction and period ω of the internal components obtained from the pile, T and vibration amplitude A T Considering the constraints of a confined space, its direction is decomposed into the X, Y, and Z directions of the experimental setup; where the angle between the simulated vibration T and the X direction is... α The amplitude in the X direction is A. T cos α The angle between the simulated vibration T and the Y direction is... β The amplitude in the Y direction is A T cos β The angle between the simulated vibration T and the Z direction is... γ The amplitude in the Z direction is A T cos γ ; Based on the decomposition results and the performance of the vibration simulation device, we have: Therefore, the forces in the X, Y, and Z directions are: according to We can obtain: X-direction exciter I and X-direction exciter II input signals with the same phase and frequency, which makes: The Y-direction exciter I and Y-direction exciter II receive signals with the same phase and frequency, which makes: The Z-direction exciter I and Z-direction exciter II receive signals with the same phase and frequency, which makes: In the formula: The magnetic force exerted by the Z-direction exciter I on the hollow steel ball; The magnetic force exerted by the Z-direction exciter II on the hollow steel ball; Step 3: Set different vibration amplitudes and frequencies, compare the abnormal simulation signals with the signals generated by the abnormal motion simulation experimental device, and calibrate the non-contact vibration simulation experimental device for the internal components of the reactor. The specific process is as follows: the non-contact vibration simulation experimental device for in-core components is placed in the reactor environment, and the signal is input to the six exciters by a controller or signal generator to generate excitation force, thereby driving the hollow steel ball to vibrate; The time-domain vibration signal of the excited blade is measured using a laser vibration meter. The vibration test results are compared with the signals of the controller or signal generator to calibrate the experimental device. Step 4: Place the non-contact vibration simulation experimental device for in-core components in the in-core environment, and conduct abnormal vibration experiments in the in-core environment according to the signals corresponding to each abnormal vibration fault to obtain neutron signals and determine the mapping relationship between each abnormal vibration fault and the neutron signal.

2. The non-contact vibration simulation experimental method for in-core components according to claim 1, characterized in that, The X-direction exciter group includes X-direction exciter I and X-direction exciter II, which are arranged opposite each other in the X direction.

3. The non-contact vibration simulation experimental method for in-core components according to claim 2, characterized in that, The Y-direction exciter group includes Y-direction exciter I and Y-direction exciter II arranged opposite each other in the Y direction.

4. The non-contact vibration simulation experimental method for in-core components according to claim 3, characterized in that, The Z-direction exciter group includes Z-direction exciter I and Z-direction exciter II arranged opposite each other in the Z direction.

5. The non-contact vibration simulation experimental method for in-core components according to claim 1, characterized in that, The specific process of step one is as follows: considering the high temperature and flow-induced vibration factors inside the reactor, a dynamic analysis model of the vibration of the reactor components under the multi-field coupling of flow, heat and solid is established. The vibration behavior characteristics of the reactor components under the multi-field coupling conditions are analyzed, the time-frequency domain characteristics of the abnormal vibration of the reactor components are analyzed, and the vibration direction, vibration period and vibration amplitude of the abnormal vibration of the reactor components are obtained.

Images