Electric reactor vibration detection method, device, equipment and medium

Abstract

The invention discloses an electric reactor vibration detection method, device and equipment and a medium, and relates to the technical field of electric power detection, and the method comprises the steps: obtaining an electric drive signal converted from the mechanical vibration of an electric reactor; based on the electric driving signal, controlling the working state of the passive vibration measurement circuit so as to perform frequency multiplication processing and amplitude modulation on the input radio frequency excitation signal to obtain a modulated harmonic signal; performing spectral analysis on the modulated harmonic signal to obtain carrier component and sideband component information, and determining a vibration frequency estimation value of the reactor based on the carrier component and sideband component information; performing inversion calculation based on the sideband component information, and determining a duty ratio estimation value corresponding to the electric driving signal; wherein the duty ratio estimated value represents the conduction time proportion of the passive vibration measurement circuit controlled by the electric driving signal; and querying a preset calibration relation based on the vibration frequency estimation value and the duty ratio estimation value to obtain the vibration acceleration of the reactor. The method can obtain an accurate detection result.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power detection, in particular to a method and device for detecting vibration of a reactor, equipment and medium. BACKGROUND

[0002] The reactor is a reactive compensation and current limiting device in the power system, and its long-term stable operation is crucial to the safety of the power grid. The reactor will produce periodic magnetostriction and electromagnetic force under the excitation of power frequency current, resulting in mechanical vibration of the core and winding. The vibration state is an index reflecting mechanical faults such as loosening of the internal compression structure, insulation aging, and coil deformation. Therefore, long-term, online, and high-precision monitoring of the vibration of the reactor is an important technical means to realize equipment condition maintenance, prevent major faults, and improve the reliability of the power grid.

[0003] At present, the vibration detection of the reactor mainly adopts a wired acceleration sensor scheme or a wireless sensing scheme based on an active circuit. The former usually adopts a piezoelectric or MEMS acceleration sensor, which is connected to a data collector by a wired mode, and then the signal is analyzed and transmitted. The latter mainly uses a battery-powered sensing node integrated with a signal conditioning circuit, an analog-to-digital converter, and a wireless transmission module, which wirelessly sends the collected vibration data to the receiving end. Both of these two schemes have been applied in industrial sites, aiming to solve the problem of obtaining and transmitting vibration information.

[0004] However, the above existing technologies have the problem that the signal is easily disturbed in actual application, which ultimately leads to inaccurate detection results.

[0005] Therefore, there is an urgent need for a reliable detection method. SUMMARY

[0006] The present application provides a method and device for detecting vibration of a reactor, which can obtain accurate detection results.

[0007] To achieve the above purpose, the present application adopts the following technical scheme: In a first aspect, the present application provides a method for detecting vibration of a reactor, comprising: obtaining an electric drive signal converted from mechanical vibration of the reactor; controlling the working state of the passive vibration measurement circuit based on the electric drive signal to perform frequency multiplication and amplitude modulation on the input radio frequency excitation signal, and obtaining a modulated harmonic signal; performing frequency spectrum analysis on the modulated harmonic signal to obtain carrier component and sideband component information, and determining the vibration frequency estimate value of the reactor based on the carrier component and sideband component information; Based on the sideband component information, an inversion calculation is performed to determine an estimated duty cycle value corresponding to the electric drive signal; wherein the estimated duty cycle value represents the proportion of the on-time of the passive vibration measurement circuit controlled by the electric drive signal; Based on the vibration frequency estimate value and the estimated duty cycle value, a preset calibration relationship is queried to obtain the vibration acceleration of the electric reactor.

[0008] In some possible implementations, the electric drive signal converted from the mechanical vibration of the electric reactor is obtained, including: Based on the piezoelectric cantilever fixed to the vibration sensitive point of the electric reactor shell, the electric drive signal converted from the mechanical vibration is obtained.

[0009] In some possible implementations, the passive vibration measurement circuit includes a frequency doubling diode unit and a controlled direct current passage unit; the frequency doubling diode unit is used to convert the input radio frequency excitation signal into a second harmonic signal; the on-off state of the controlled direct current passage unit is controlled by the electric drive signal, and is used to switch the direct current bias state of the frequency doubling diode unit.

[0010] In some possible implementations, based on the electric drive signal, the working state of the passive vibration measurement circuit is controlled to perform frequency doubling processing and amplitude modulation on the input radio frequency excitation signal to obtain a modulated harmonic signal, including: In the case that the instantaneous value of the electric drive signal is greater than a preset first voltage, the controlled direct current passage unit is turned on, otherwise the controlled direct current passage unit is turned off; In the case that the controlled direct current passage unit is turned on, the frequency doubling diode unit is in a first direct current bias state to obtain a second harmonic signal with a first amplitude; In the case that the controlled direct current passage unit is turned off, the frequency doubling diode unit is in a second direct current bias state to obtain a second harmonic signal with a second amplitude; Based on the second harmonic signal, the modulated harmonic signal is obtained.

[0011] In some possible implementations, the modulated harmonic signal is subjected to frequency spectrum analysis to obtain carrier component and sideband component information, and based on the carrier component and sideband component information, a vibration frequency estimate value of the electric reactor is determined, including: The modulated harmonic signal is subjected to frequency spectrum analysis to obtain a carrier frequency corresponding to the carrier component, a first upper sideband frequency corresponding to the first upper sideband component, and a first lower sideband frequency corresponding to the first lower sideband component; The difference between the first upper sideband frequency and the carrier frequency is taken as a first frequency difference; The difference between the carrier frequency and the first lower sideband frequency is taken as a second frequency difference; The average of the first frequency difference and the second frequency difference is taken as the vibration frequency estimate value of the electric reactor.

[0012] In some possible implementation manners, based on the sideband component information, the inversion calculation is performed to determine a duty cycle estimation value of the duty cycle parameter, including: based on the sideband component information, determining a first amplitude of a first target order sideband component and a second amplitude of a second target order sideband component; taking a ratio of the second amplitude to the first amplitude as a target sideband amplitude ratio; based on a preset corresponding relationship between the target sideband amplitude ratio and the duty cycle parameter, determining a target duty cycle parameter value corresponding to the target sideband amplitude ratio, and taking the target duty cycle parameter value as the duty cycle estimation value.

[0013] In some possible implementation manners, based on the vibration frequency estimation value and the duty cycle estimation value, a preset calibration relationship is queried to obtain the vibration acceleration of the electric reactor, including: based on the vibration frequency estimation value, determining a calibration frequency interval to which the vibration frequency estimation value belongs; based on the estimation frequency segment and the calibration frequency interval, determining a mapping relationship table corresponding to the estimation frequency segment; wherein the mapping relationship represents a corresponding relationship between the duty cycle parameter and the vibration acceleration; based on the duty cycle estimation value and the mapping relationship table, determining the vibration acceleration of the electric reactor.

[0014] In a second aspect, the present application provides an electric reactor vibration detection device, including: an acquisition module configured to acquire an electric drive signal converted from mechanical vibration of an electric reactor; a modulation module configured to control a working state of a passive vibration measurement circuit based on the electric drive signal to perform frequency multiplication processing and amplitude modulation on an input radio frequency excitation signal to obtain a modulated harmonic signal; a first estimation module configured to perform frequency spectrum analysis on the modulated harmonic signal to obtain carrier component and sideband component information, and determine a vibration frequency estimation value of the electric reactor based on the carrier component and the sideband component information; a second estimation module configured to perform inversion calculation based on the sideband component information to determine a duty cycle estimation value corresponding to the electric drive signal; wherein the duty cycle estimation value represents a conduction time proportion of the passive vibration measurement circuit controlled by the electric drive signal; a detection module configured to query a preset calibration relationship based on the vibration frequency estimation value and the duty cycle estimation value to obtain a vibration acceleration of the electric reactor.

[0015] In a third aspect, the present application provides a computing device including a memory and a processor; wherein one or more computer programs are stored in the memory, and the one or more computer programs include instructions; when the instructions are executed by the processor, the computing device performs the method in any one of the first aspect.

[0016] In a fourth aspect, the present application provides a computer-readable storage medium for storing a computer program for executing the method according to any one of the first aspect.

[0017] In a fifth aspect, the present application provides a computer program product comprising one or more computer instructions, which, when executed by a computer, execute the method according to any one of the first aspect.

[0018] From the above technical solutions, the present application has at least the following beneficial effects: In the present application, by acquiring the electric driving signal converted from the mechanical vibration of the reactor, the amplitude and frequency characteristics of the vibration are reflected, providing a reliable original signal basis for the subsequent state control of the passive vibration measurement circuit, and laying a foundation for the passivation of the entire detection process. The piezoelectric effect is used to directly convert mechanical vibration into an electric driving signal in the form of an NMOS gate-source voltage, without the need for additional signal conditioning modules and power supply devices. By installing the piezoelectric cantilever along the main vibration direction of the reactor shell at the sensitive point, the piezoelectric cantilever can autonomously complete the conversion of mechanical energy and electrical energy, eliminating the hardware cost and operation and maintenance investment of the signal conditioning link in the traditional scheme, simplifying the signal acquisition link, reducing the intermediate nodes of signal transmission, and generating an electric driving signal that can.

[0019] Further, the electric driving signal is used to control the working state of the passive vibration measurement circuit to generate a modulated harmonic signal. This step relies on a passive vibration measurement circuit based on frequency multiplication combined with gating, and uses the electric driving signal to control the conduction and shutdown of the NMOS transistor, to realize double frequency processing and amplitude modulation of the radio frequency excitation signal. The circuit uses a low-barrier Schottky diode as the core to realize passive frequency multiplication, filters the fundamental wave interference with a quarter-wave short-circuit branch, and builds a self-generated direct current loop through inductance and capacitance. The NMOS is only responsible for the gating of the direct current path and does not interfere with the radio frequency frequency multiplication, realizing the whole process without external power supply or built-in battery, and completely solving the endurance limitation and high maintenance cost problem of the traditional active vibration measurement scheme, adapting to the long-term unattended reactor monitoring scene. At the same time, the passive circuit architecture combined with the radio frequency interference bypass design of the bypass capacitor greatly improves the anti-interference ability in the strong electromagnetic radiation environment of the reactor, avoids the disadvantage of signal loss of the active circuit, and can also accurately encode the vibration information into the second harmonic signal through the vibration-driven circuit state switching, realizing the combination of signal modulation and passive work.

[0020] Further, the modulated harmonic signal is analyzed and the vibration frequency estimation value is determined; the step analyzes the modulated harmonic signal into a spectrum line string composed of carrier and sideband components by a spectrum analysis module, and then estimates the vibration frequency by using the average frequency difference between the first-order sideband and the carrier. Compared with the traditional single frequency point detection method, this calculation method based on the average frequency difference of the spectrum line string can effectively offset part of the spectrum noise and the equipment detection error, and can accurately lock the vibration frequency characteristics of the reactor even in a complex electromagnetic environment. At the same time, the vibration frequency is extracted through the spectrum line analysis of the second harmonic, instead of directly collecting the original vibration electric signal, which further isolates the interference of the electromagnetic radiation around the reactor on the frequency detection, and guarantees the stability and accuracy of the vibration frequency estimation value, providing frequency parameter support for subsequent acceleration calculation.

[0021] Further, the duty cycle estimation value is inverted based on the sideband component; this step inverts the duty cycle by using the monotonic mapping relationship between the amplitudes of the first-order and second-order sidebands, and suppresses the multipath and fading interference by taking the average of the amplitudes of the left and right sidebands. The advantage is that it breaks through the limitation of traditional duty cycle inversion which relies on a single signal and is easily affected by noise, and the monotonic characteristic of the amplitude ratio ensures the uniqueness and accuracy of the duty cycle inversion. The processing method of the average of the left and right sidebands can effectively reduce the single-side spectrum error caused by the multipath effect and signal fading in the wireless transmission process, so that the duty cycle estimation value has distance and interference robustness. In addition, as a key parameter representing the conduction time ratio of the passive vibration measurement circuit, the high-precision inversion of the duty cycle builds a reliable intermediate data bridge for the subsequent calculation of the vibration acceleration, and improves the parameter transmission accuracy of the entire detection link.

[0022] Finally, the vibration acceleration is obtained based on the vibration frequency and the duty cycle query calibration relationship; this step first completes data consistency check by back substitution of the gate amplitude based on the duty cycle, and then maps the two parameters into the vibration acceleration by calling the calibration relationship. The beneficial effects are reflected in two aspects. First, the calibration relationship adopts differentiated mapping relationship of duty cycle and acceleration according to the sensitivity difference of piezoelectric cantilever resonance and non-resonance frequency, which solves the problem of insufficient accuracy of traditional single calibration curve in a wide frequency range, and can realize accurate detection of 0.09g small acceleration at resonance frequency, meet the needs of weak vibration monitoring of early reactor faults, and cover a large acceleration range of 10g at non-resonance frequency, adapt to strong vibration working conditions after the fault intensifies. Second, the back substitution check link can verify the effectiveness of the data, eliminate abnormal data, and ensure that the final output vibration acceleration has accuracy and reliability, realizing closed-loop accurate conversion from electrical parameters to mechanical vibration indicators.

[0023] It should be understood that the descriptions of technical features, technical solutions, beneficial effects, or similar language in this application do not imply that all features and advantages can be achieved in any single embodiment. Rather, it is understood that the description of a feature or beneficial effect means that a specific technical feature, technical solution, or beneficial effect is included in at least one embodiment. Therefore, the descriptions of technical features, technical solutions, or beneficial effects in this specification do not necessarily refer to the same embodiment. Furthermore, the technical features, technical solutions, and beneficial effects described in this embodiment can be combined in any suitable manner. Those skilled in the art will understand that embodiments can be implemented without one or more specific technical features, technical solutions, or beneficial effects of a particular embodiment. In other embodiments, additional technical features and beneficial effects may be identified in specific embodiments that do not embody all embodiments. Attached Figure Description

[0024] Figure 1 This is an application environment diagram of a reactor vibration detection method according to an embodiment of this application; Figure 2 This is a schematic flowchart of a reactor vibration detection method according to an embodiment of this application; Figure 3 This is a structural diagram of a passive vibration measurement circuit according to an embodiment of this application; Figure 4 This is a schematic diagram of the structure of a reactor vibration detection device according to an embodiment of this application; Figure 5 This is a schematic diagram of a computing device provided in an embodiment of this application. Detailed Implementation

[0025] The terms "first," "second," and "third," etc., used in this application specification and accompanying drawings are used to distinguish different objects, not to limit a specific order.

[0026] In the embodiments of this application, the terms "exemplary" or "for example" are used to indicate that something is an example, illustration, or description. Any embodiment or design that is described as "exemplary" or "for example" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or design. Specifically, the use of the terms "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0027] In view of this, embodiments of this application provide a method for detecting reactor vibration.

[0028] To make the technical solution of this application clearer and easier to understand, the application scenarios of the technical solution of this application are described below with reference to the accompanying drawings. Figure 1 As shown in the figure, this figure is a schematic diagram of an application scenario provided by an embodiment of this application.

[0029] In this application scenario, terminal 102 collects the mechanical vibration of the reactor through a piezoelectric cantilever and converts it into an electric drive signal. The electric drive signal is then sent to server 104, which analyzes and calculates the vibration, such as through spectrum analysis and table lookup. The server 104 then sends the calculated vibration frequency, acceleration, health status, and other results back to terminal 102. Terminal 102 can provide status prompts through a local display, indicator lights, or an audible and visual alarm.

[0030] To make the technical solution of this application clearer and easier to understand, the following describes a reactor vibration detection method provided by an embodiment of this application, in conjunction with the above application scenarios. Figure 2 As shown in the figure, this is a flowchart of a reactor vibration detection method provided in an embodiment of this application.

[0031] The reactor vibration detection method includes: S201. Obtain the electric drive signal converted from the mechanical vibration of the reactor.

[0032] Optionally, an electric drive signal converted from mechanical vibration can be obtained based on a piezoelectric cantilever fixed to a vibration-sensitive point on the reactor housing.

[0033] Among them, the piezoelectric cantilever is a sensing element that uses the piezoelectric effect to convert mechanical vibration into electrical signals. It is usually a cantilever beam structure that generates alternating voltage when subjected to vibration.

[0034] The reactor casing is the outer shell of the reactor. Vibration-sensitive points refer to areas on its surface where the vibration amplitude is large or where the vibration response is obvious.

[0035] Gate-source voltage refers to the voltage between the gate and source of a field-effect transistor (such as an NMOS transistor), which is used to control the transistor's on / off state.

[0036] Shielded wires are wires with a shielding layer, used to transmit weak signals and prevent external electromagnetic interference.

[0037] Vibration acceleration is a physical quantity that describes the intensity of vibration and is positively correlated with the voltage amplitude output by the piezoelectric cantilever.

[0038] Vibration frequency is the number of times a mechanical vibration repeats per second, corresponding to the frequency of an electrical signal.

[0039] For example, a piezoelectric cantilever can be attached or screwed to a vibration-sensitive point along the main vibration direction of the reactor housing, allowing it to directly sense the mechanical vibration of the equipment. Utilizing the piezoelectric effect, the cantilever converts the vibration into an alternating electrical signal, which is transmitted to the gate of an NMOS transistor through a shielded wire, forming a gate-source voltage that varies with vibration. . The time-domain model is:

[0040] in, This represents the instantaneous value of the gate-source voltage; The gate-source voltage amplitude increases with increasing vibration acceleration; The vibration frequency; This is the initial phase.

[0041] Through this process, mechanical vibration is effectively converted into electrical drive with corresponding amplitude, frequency and phase, providing the original electrical signal basis for the subsequent driving, signal modulation and vibration parameter calculation of passive vibration measurement circuit.

[0042] S202. Based on the electric drive signal, control the working state of the passive vibration measurement circuit to perform frequency multiplication and amplitude modulation on the input radio frequency excitation signal to obtain the modulated harmonic signal.

[0043] Optionally, the passive vibration measurement circuit includes a frequency doubling diode unit and a controlled DC path unit; the frequency doubling diode unit is used to convert the input RF excitation signal into a second harmonic signal; the on / off state of the controlled DC path unit is controlled by an electric drive signal to switch the DC bias state of the frequency doubling diode unit.

[0044] For example, such as Figure 3 As shown, in a passive vibration measurement circuit, a low-barrier Schottky diode is used as a passive frequency doubler on a microstrip PCB, with quarter-wavelength short-circuit branches connected on both sides; the output side uses... and Provides a self-generated DC circuit; in A bypass capacitor is connected in parallel between the NMOS transistor and ground. This allows the NMOS to only gate the DC path and not interfere with the RF frequency doubling behavior. When the NMOS is turned off, the diode exhibits self-generated reverse bias, and its DC voltage is... This refers to the DC voltage across the diode.

[0045] In one implementation, when the instantaneous value of the electric drive signal is greater than a preset first voltage, the controlled DC path unit is turned on; otherwise, the controlled DC path unit is turned off. When the controlled DC path unit is turned on, the frequency doubling diode unit is in a first DC bias state, obtaining a second harmonic signal with a first amplitude. When the controlled DC path unit is turned off, the frequency doubling diode unit is in a second DC bias state, obtaining a second harmonic signal with a second amplitude. Based on the second harmonic signal, a modulated harmonic signal is obtained.

[0046] Among them, the passive vibration measurement circuit is a circuit that does not rely on an external power supply and only relies on the input signal to complete vibration measurement and modulation. It usually includes frequency doubling, filtering and modulation functions.

[0047] A frequency doubling diode unit is a circuit composed of low-barrier Schottky diodes, used to double the frequency of the input radio frequency signal and output a second harmonic signal.

[0048] The controlled DC path unit is a path composed of an NMOS transistor and a bypass capacitor, etc. Its on / off state is controlled by an electrical drive signal to change the DC bias condition of the diode.

[0049] The second harmonic signal is a signal with a frequency twice that of the input signal, and its amplitude is modulated by the diode bias state.

[0050] Modulated harmonic signals are second harmonic signals that have undergone amplitude modulation; their amplitude changes reflect vibration information.

[0051] The preset first voltage refers to the threshold voltage for the NMOS transistor to turn on. The transistor turns on when the gate-source voltage exceeds this value.

[0052] The first DC bias state is the diode's zero bias state; the second DC bias state is the diode's reverse bias state; the first DC bias state and the second DC bias state affect the output amplitude of the second harmonic.

[0053] A quarter-wavelength short-circuit branch is a microstrip line with a length one-quarter of the signal wavelength, short-circuited at one end, used for filtering and impedance matching.

[0054] For example, based on an electrically driven signal (i.e., the gate-source voltage output by the piezoelectric cantilever), the operating state of the passive vibration measurement circuit is controlled to achieve frequency multiplication and amplitude modulation of the input RF excitation signal, ultimately outputting a modulated harmonic signal. The passive vibration measurement circuit consists of a frequency multiplier diode unit and a controlled DC path unit. The frequency doubling diode unit uses a low-barrier Schottky diode to achieve passive frequency doubling, and a quarter-wavelength short-circuit branch is connected in series on both sides to filter out noise interference.

[0055] The controlled DC path unit includes a series connection to the inductor The NMOS transistor and its parallel bypass capacitor connected to ground Its on / off state is controlled by an electric drive signal.

[0056] The specific working process is as follows: when the instantaneous value of the electric drive signal is greater than the NMOS turn-on voltage (preset first voltage), the controlled DC path unit is turned on, and the inductor... With DC grounded, the diode is in a zero-bias state (first DC bias state), and the second harmonic output amplitude is at its maximum (first amplitude). Conversely, when the electric drive signal is insufficient to turn on the NMOS, the controlled DC path unit is turned off, and the diode forms a reverse bias through its self-generated DC circuit (second DC bias state), and its DC voltage... When the value is negative, the second harmonic output amplitude decreases significantly (second amplitude). This process achieves passive state switching based on the vibration signal, making the second harmonic amplitude change with the vibration frequency and acceleration, thus completing the amplitude modulation of the radio frequency signal by the vibration information, while the bypass capacitor... This ensures that the switching action only affects the DC path and does not interfere with the radio frequency doubling behavior. The final output modulated harmonic signal contains complete information on the vibration frequency and amplitude, laying the foundation for subsequent wireless transmission and spectrum analysis.

[0057] Optionally, the DC voltage is The DC voltage across the diode can be expressed as:

[0058] in, It is the amplitude of the fundamental voltage across the diode; It is a two-pole ideal factor; It is thermal voltage; It is a zero-order modified Bessel function of the first kind.

[0059] When NMOS is turned off When the diode is reverse biased, the second harmonic power decreases significantly; when the NMOS is turned on... DC grounded, diode zero bias, second harmonic output at maximum. Bypassing allows the switch to affect only the DC circuit and not the RF frequency multiplication.

[0060] It should be noted that in the specific implementation of controlling the operating state of the passive vibration measurement circuit based on the electric drive signal, a quantitative foundation must first be established through experiments and modeling, such as sweeping the electric drive signal (i.e., the gate-source voltage amplitude) on the experimental platform. The second harmonic output power curve was recorded, and the equivalent threshold voltage of the frequency multiplier from OFF (off) to ON (closed) was calculated using the step-by-step approximate minimum error method. The purpose is to minimize the measured second harmonic power. Power of the ideal step model Mean square / mean absolute deviation index ,Right now Finally, the value that minimizes the error is selected. As equivalent threshold voltage .

[0061] In this way By setting a first voltage, the circuit state can be controlled: when the instantaneous value of the electric drive signal is greater than... When the controlled DC path unit is turned on, the frequency doubling diode unit is in the first DC bias state, and outputs a second harmonic signal with a first amplitude; when the instantaneous value of the electric drive signal is less than At this time, the controlled DC path unit is turned off, the frequency doubling diode unit is in the second DC bias state, and outputs a second harmonic signal with the second amplitude. Simultaneously, the gating effect of vibration on the circuit is described as the duty cycle. D Square wave model ( ,in For NMOS conduction time, (for the oscillation period), and through Establish duty cycle and threshold voltage Gate-source voltage amplitude The quantitative relationship is ultimately used to obtain the modulated harmonic signal carrying vibration information based on the second harmonic signal with periodically switched amplitude.

[0062] S203. Perform spectrum analysis on the modulated harmonic signal to obtain information on the carrier component and sideband components, and determine the estimated value of the reactor's vibration frequency based on the information on the carrier component and sideband components.

[0063] One possible approach is to perform spectral analysis on the modulated harmonic signal to obtain the carrier frequency corresponding to the carrier component, the first upper sideband frequency corresponding to the first upper sideband component, and the first lower sideband frequency corresponding to the first lower sideband component; the difference between the first upper sideband frequency and the carrier frequency is taken as the first frequency difference; the difference between the carrier frequency and the first lower sideband frequency is taken as the second frequency difference; and the average value of the first frequency difference and the second frequency difference is taken as the estimated value of the reactor's vibration frequency.

[0064] Among them, the modulated harmonic signal is the second harmonic signal after amplitude modulation. Its spectrum contains a center carrier and a series of symmetrical sideband components. The spacing of the sidebands reflects the frequency of the modulated signal (i.e., the vibration signal).

[0065] Spectrum analysis is the process of converting a signal from the time domain to the frequency domain for analysis, used to extract the frequency components of the signal as well as its amplitude and phase information.

[0066] The carrier component is the component in the spectrum located at the center frequency, corresponding to the frequency of the unmodulated second harmonic signal. ).

[0067] Sideband components are components symmetrically distributed on both sides of the carrier wave in the frequency spectrum. They are caused by the modulating signal (vibration signal), and their frequency difference with the carrier wave is equal to the frequency of the modulating signal. (or an integer multiple thereof).

[0068] The first upper sideband component is the upper sideband component closest to the carrier, and its frequency is... .

[0069] The first lower sideband component is the lower sideband component closest to the carrier, and its frequency is... .

[0070] The carrier frequency is the frequency corresponding to the carrier component, i.e., the second harmonic frequency. .

[0071] The vibration frequency estimate is the result of calculating the mechanical vibration frequency of the reactor using spectral parameters.

[0072] For example, spectral analysis is performed on the modulated harmonic signal to extract an estimated value of the reactor's vibration frequency from the spectrum; specifically, the received modulated harmonic signal is analyzed to obtain its spectral structure, which includes a frequency located at the second harmonic frequency. The carrier component at the specified location, and the sideband components symmetrically distributed on both sides of the carrier. This is achieved by identifying the first upper sideband component (frequency: ...). ) and the first lower sideband component (frequency is ), and calculate their relationship with the carrier frequency respectively. The difference: The difference between the first upper sideband frequency and the carrier frequency is taken as the first frequency difference ( The difference between the carrier frequency and the first lower sideband frequency is used as the second frequency difference. Since both of these frequency differences should ideally be equal to the vibration frequency. To reduce the impact of measurement errors and spectral resolution, the average of the first and second frequency differences is used as the final estimated value of the reactor's vibration frequency. The calculation formula is as follows:

[0073] This step makes full use of the symmetry of the spectrum and effectively improves the accuracy and robustness of vibration frequency extraction by cross-checking the information from both sides, providing important frequency parameters for subsequent vibration acceleration inversion by combining duty cycle.

[0074] It should be noted that before performing spectral analysis on the modulated harmonic signal, the vibration information must first be "spectral encoded": the transmitting end generates a single-frequency continuous wave through a frequency synthesizer, which is then radiated by a fundamental resonant antenna after low-pass filtering and impedance matching; the receiving end uses a second harmonic resonant antenna to receive the signal, which is then pre-filtered, amplified with low noise, and the spectral lines are acquired. The second harmonic is considered as a spectral line string modulated by a square wave amplitude with a duty cycle of D, and a spectral mathematical model is established (i.e., ), clarifying the relationship between carrier, sideband amplitude and duty cycle (wherein ).

[0075] Based on this model, spectral analysis of the modulated harmonic signal is performed to obtain the carrier frequency (i.e., the second harmonic frequency) corresponding to the carrier component. The first upper sideband frequency corresponding to the first upper sideband component and the first lower sideband frequency corresponding to the first lower sideband component are calculated. The difference between the first upper sideband frequency and the carrier frequency is taken as the first frequency difference, and the difference between the carrier frequency and the first lower sideband frequency is taken as the second frequency difference. Finally, the average frequency difference between the first sideband and the carrier frequency is used to calculate the average value of the first frequency difference and the second frequency difference as the estimated value of the reactor's vibration frequency.

[0076] S204. Based on the sideband component information, perform inversion calculations to determine the estimated duty cycle value corresponding to the electric drive signal.

[0077] The duty cycle estimate represents the proportion of the passive vibration measurement circuit that is controlled by the electrically driven signal during conduction.

[0078] One possible approach is to determine, based on sideband component information, the first amplitude of the first target order sideband component and the second amplitude of the second target order sideband component; to use the ratio of the second amplitude to the first amplitude as the target sideband amplitude ratio; to determine the target duty cycle parameter value corresponding to the target sideband amplitude ratio based on a preset correspondence between the sideband amplitude ratio and the duty cycle parameter, and to use the target duty cycle parameter value as the duty cycle estimate.

[0079] Among them, sideband component information refers to the information in the spectrum of the modulated harmonic signal, excluding the carrier component (located at frequency...). Apart from the frequency component symmetrically distributed on both sides of the carrier wave, its frequency is... ( (Integer, representing the order).

[0080] Inversion calculation refers to the process of using observable physical quantities (such as spectral amplitude) to deduce original signal parameters (such as duty cycle) that cannot be directly measured.

[0081] The duty cycle estimate represents the proportion of time that the passive vibration measurement circuit is in the conducting state within one vibration cycle, and is a modulation parameter that reflects the intensity of the vibration.

[0082] The first target order sideband component is a specific order selected in the inversion calculation (e.g., ...). The sideband components of ) are typically first-order sidebands with frequencies of . .

[0083] The second target order sideband component is another specific order selected in the inversion calculation (such as...). The sideband components of ) are typically second-order sidebands with frequencies of . .

[0084] The first amplitude refers to the amplitude value of the first target-order sideband component in the spectrum, which can be denoted as: .

[0085] The second amplitude refers to the amplitude value of the second target-order sideband component in the spectrum, which can be denoted as: .

[0086] The target sideband amplitude ratio refers to the ratio of the second amplitude to the first amplitude, which can be denoted as: .

[0087] The pre-defined correspondence refers to the one-to-one mapping relationship between the sideband amplitude ratio and the duty cycle established through theoretical derivation or experimental calibration, which is usually expressed as a monotonic function.

[0088] The target duty cycle parameter value is a duty cycle value calculated or obtained by looking up a table based on the target sideband amplitude ratio through a preset correspondence.

[0089] For example, the estimated duty cycle controlled by the electrically driven signal is determined by inversion calculation from the spectrum of the modulated harmonic signal. This value directly reflects the modulation intensity of the vibration on the passive vibration measurement circuit. Specifically, based on sideband component information, two specific-order sideband components are selected, typically first-order sidebands (…). ) and second-order sidebands ( Extract the first amplitude of each. Second amplitude Calculate the ratio of the two to obtain the target sideband amplitude ratio. Based on theoretical derivations (such as the square wave amplitude modulation model), the sideband amplitude ratio and duty cycle... There exists a definite pre-defined correspondence, the expression of which is:

[0090] This relationship is It is monotonic within a certain range, therefore it can be solved using an inverse function. Alternatively, a pre-calibrated lookup table can be used to uniquely determine the target duty cycle parameter value, i.e., the duty cycle estimate, based on the target sideband amplitude ratio. To suppress the impact of multipath fading on single-sided spectral lines in wireless channels, in practical applications, the amplitude ratios of the left and right sidebands can be extracted separately, inverted, and averaged to improve the robustness of the estimation. This method fully utilizes the inherent laws of the spectral structure, achieving a precise mapping from observable spectral amplitudes to vibration modulation parameters, laying the foundation for subsequent vibration acceleration calculations.

[0091] S205. Based on the estimated vibration frequency and duty cycle, query the preset calibration relationship to obtain the vibration acceleration of the reactor.

[0092] One possible approach is to determine the calibration frequency range to which the vibration frequency estimate belongs based on the vibration frequency estimate; to determine the mapping relationship table corresponding to the estimated frequency range based on the estimated frequency range and the calibration frequency range; wherein the mapping relationship characterizes the correspondence between the duty cycle parameter and the vibration acceleration; and to determine the vibration acceleration of the reactor based on the duty cycle estimate and the mapping relationship table.

[0093] The vibration frequency estimate refers to the frequency estimate of the reactor's mechanical vibration obtained through spectrum analysis, denoted as . .

[0094] The duty cycle estimate refers to the modulation parameter obtained through sideband amplitude ratio inversion, which represents the proportion of the conduction time of the passive vibration measurement circuit, denoted as... .

[0095] Preset calibration relationship refers to the set of correspondences between duty cycle and vibration acceleration established in advance through experiments at different vibration frequencies.

[0096] The calibration frequency range refers to the range divided by frequency segments according to the preset calibration relationship, with each segment corresponding to a vibration frequency range.

[0097] A mapping table refers to a data table or function model that shows a one-to-one correspondence between duty cycle and vibration acceleration within a certain calibrated frequency range.

[0098] Vibration acceleration refers to the physical quantity of vibration acceleration of the reactor shell, which is a core indicator reflecting its mechanical state, denoted as . .

[0099] For example, the extracted vibration frequency and duty cycle parameters are converted into an index reflecting the mechanical vibration intensity of the reactor, namely vibration acceleration, through a preset calibration relationship. The specific implementation method is as follows: first, based on the estimated vibration frequency... First, determine its calibration frequency range (e.g., 120Hz or 130Hz). Then, based on this range, call the corresponding mapping table, which has been pre-calibrated experimentally and records the correspondence between the duty cycle parameter and vibration acceleration at that frequency. Then, the estimated duty cycle value... Substitute the values ​​into the mapping table and determine the corresponding vibration acceleration through interpolation or table lookup. For example, if the vibration frequency is 130Hz (the resonant frequency of the piezoelectric cantilever), the calibration curve at that frequency is used to map the duty cycle to acceleration. In this case, the sensor has high sensitivity and is suitable for detecting weak vibrations. If the frequency is 120Hz (a non-resonant frequency), the corresponding curve is used, which is suitable for monitoring a larger vibration range. This segmented calibration method effectively overcomes the problem of large sensitivity differences of a single calibration curve at different frequencies, ensuring the accuracy and adaptability of vibration acceleration calculation throughout the entire operating frequency band, and ultimately completing a high-precision closed-loop conversion from wireless spectrum parameters to mechanical vibration indicators.

[0100] It should be noted that, based on the estimated vibration frequency, the calibration frequency range to which the estimated vibration frequency belongs is determined; simultaneously, combined with the estimated duty cycle, the formula is used... Back-substitution calculation of gate amplitude (where For the estimated gate-source amplitude, Threshold voltage, The duty cycle estimate is used for circuit signal consistency verification; subsequently, based on the calibration frequency range to which the vibration frequency estimate belongs, a mapping table corresponding to that range is determined (i.e., "frequency segment calibration mapping"), the mapping relationship is determined using a lookup table function. It exists in the form of, in which (This is the estimated vibration frequency); finally, based on the estimated duty cycle and the mapping table, the formula is used... The vibration acceleration of the reactor was calculated. .

[0101] Based on the above, the reactor vibration detection method acquires the electrical drive signal converted from the reactor's mechanical vibration, reflecting the amplitude and frequency characteristics of the vibration. This provides a reliable original signal basis for the subsequent passive vibration measurement circuit's state control and lays the foundation for the passive nature of the entire detection process. Utilizing the piezoelectric effect, it directly converts mechanical vibration into an electrical drive signal in the form of an NMOS gate-source voltage, eliminating the need for additional signal conditioning modules and power supply devices. By installing a piezoelectric cantilever along the main vibration direction of the reactor shell at the sensitive point, the piezoelectric cantilever can autonomously complete the conversion between mechanical energy and electrical energy, saving the hardware cost and maintenance investment of the signal conditioning stage in traditional solutions. At the same time, it simplifies the signal acquisition link, reduces intermediate nodes in signal transmission, and generates an electrical drive signal.

[0102] Furthermore, based on the electric drive signal controlling the operating state of the passive vibration measurement circuit, a modulated harmonic signal is generated. This step relies on a passive vibration measurement circuit that combines frequency doubling and gating. The electric drive signal controls the on and off of the NMOS transistor to achieve frequency doubling and amplitude modulation of the RF excitation signal. The circuit uses a low-barrier Schottky diode as the core to achieve passive frequency doubling, and a quarter-wavelength short-circuit branch filters fundamental interference. At the same time, an inductor and capacitor are used to build a self-generated DC circuit. The NMOS is only responsible for the gating of the DC path and does not interfere with the RF frequency doubling. This achieves the goal of not requiring an external power supply or built-in battery throughout the process, completely solving the problems of limited battery life and high maintenance costs of traditional active vibration measurement solutions. It is suitable for long-term unattended reactor monitoring scenarios. At the same time, the passive circuit architecture combined with the RF interference bypass design of the bypass capacitor greatly improves the anti-interference capability in the strong electromagnetic radiation environment of the reactor, avoids the disadvantage of signal distortion in active circuits, and can accurately encode vibration information into the second harmonic signal through vibration-driven circuit state switching, achieving a balance between signal modulation and passive operation.

[0103] Furthermore, the modulated harmonic signal is spectrally analyzed to determine the estimated vibration frequency. This step uses a spectrum analysis module to resolve the modulated harmonic signal into a spectral string composed of carrier and sideband components, and then uses the average frequency difference between the first-order sideband and the carrier to estimate the vibration frequency. Compared to traditional single-frequency detection methods, this calculation method based on the average frequency difference of the spectral string can effectively offset some spectral noise and equipment detection errors. Even in complex electromagnetic environments, it can accurately pinpoint the vibration frequency characteristics of the reactor. At the same time, by extracting the vibration frequency through spectral analysis of the second harmonic, rather than directly acquiring the original vibration electrical signal, the interference of electromagnetic radiation around the reactor on frequency detection is further isolated, ensuring the stability and accuracy of the vibration frequency estimate and providing frequency parameter support for subsequent acceleration calculations.

[0104] Furthermore, the duty cycle estimate is retrieved based on the sideband components. This step utilizes the monotonic mapping relationship between the first and second-order sideband amplitude ratios to retrieve the duty cycle, and suppresses multipath and fading interference by averaging the amplitude ratios of the left and right sidebands. Its advantages lie in overcoming the limitations of traditional duty cycle retrieval methods that rely on a single signal and are susceptible to noise. The monotonicity of the amplitude ratios ensures the uniqueness and accuracy of the duty cycle retrieval. The method of averaging the left and right sidebands effectively reduces the single-sided spectral errors caused by multipath effects and signal fading during wireless transmission, making the duty cycle estimate robust to distance and interference. In addition, the high-precision retrieval of the duty cycle, as a key parameter characterizing the conduction time ratio of a passive vibration measurement circuit, provides a reliable intermediate data bridge for subsequent vibration acceleration calculations, improving the parameter transmission accuracy of the entire detection link.

[0105] Finally, the vibration acceleration is obtained by querying the calibration relationship based on the vibration frequency and duty cycle. This step first completes the data consistency verification by substituting the gate amplitude back into the duty cycle, and then calls the calibration relationship to map the two parameters into vibration acceleration. Its beneficial effects are reflected in two aspects. First, the calibration relationship adopts a differentiated duty cycle and acceleration mapping relationship to address the sensitivity difference between the resonant and non-resonant frequencies of the piezoelectric cantilever, solving the problem of insufficient accuracy of the traditional single calibration curve in a wide frequency range. It can achieve accurate detection of a small acceleration of 0.09g at the resonant frequency, meeting the weak vibration monitoring requirements of early faults in reactors, and can cover a large acceleration range of 10g at the non-resonant frequency, adapting to the strong vibration conditions after the fault intensifies. Second, the back-substitution verification step can verify the validity of the data, eliminate abnormal data, and ensure that the final output vibration acceleration has both accuracy and reliability, realizing a closed-loop accurate conversion from electrical parameters to mechanical vibration indicators.

[0106] The above text combined Figures 1 to 2 The reactor vibration detection method provided in the embodiments of this application has been described in detail. The apparatus and equipment provided in the embodiments of this application will be described below with reference to the accompanying drawings.

[0107] This application also provides a reactor vibration detection device, such as... Figure 4 As shown in the figure, this is a structural schematic diagram of a reactor vibration detection device 400 provided in an embodiment of this application. The device includes: The acquisition module 401 is used to acquire the electric drive signal converted from the mechanical vibration of the reactor; The modulation module 402 is used to control the working state of the passive vibration measurement circuit based on the electric drive signal, so as to perform frequency multiplication and amplitude modulation on the input radio frequency excitation signal to obtain the modulated harmonic signal. The first estimation module 403 is used to perform spectrum analysis on the modulated harmonic signal to obtain information on the carrier component and sideband component, and to determine the estimated value of the reactor's vibration frequency based on the information on the carrier component and sideband component. The second estimation module 404 is used to perform inversion calculations based on sideband component information to determine the duty cycle estimate corresponding to the electric drive signal; wherein, the duty cycle estimate characterizes the proportion of the passive vibration measurement circuit controlled by the electric drive signal during conduction time. The detection module 405 is used to obtain the vibration acceleration of the reactor by querying the preset calibration relationship based on the vibration frequency estimate and the duty cycle estimate.

[0108] In some possible implementations, module 401 is specifically used for: An electric drive signal converted from mechanical vibration is obtained by using a piezoelectric cantilever fixed to a vibration-sensitive point on the reactor housing.

[0109] In some possible implementations, the passive vibration measurement circuit includes a frequency doubling diode unit and a controlled DC path unit; the frequency doubling diode unit is used to convert the input radio frequency excitation signal into a second harmonic signal; the on / off state of the controlled DC path unit is controlled by the electric drive signal to switch the DC bias state of the frequency doubling diode unit.

[0110] In some possible implementations, the modulation module 402 is specifically used for: When the instantaneous value of the electric drive signal is greater than a preset first voltage, the controlled DC path unit is turned on; otherwise, the controlled DC path unit is turned off. When the controlled DC path unit is turned on, the frequency doubling diode unit is in a first DC bias state, and a second harmonic signal with a first amplitude is obtained; When the controlled DC path unit is turned off, the frequency doubling diode unit is in a second DC bias state, resulting in a second harmonic signal with a second amplitude. Based on the second harmonic signal, the modulated harmonic signal is obtained.

[0111] In some possible implementations, the first estimation module 403 is specifically used for: Spectral analysis is performed on the modulated harmonic signal to obtain the carrier frequency corresponding to the carrier component, the first upper sideband frequency corresponding to the first upper sideband component, and the first lower sideband frequency corresponding to the first lower sideband component. The difference between the first upper sideband frequency and the carrier frequency is taken as the first frequency difference; The difference between the carrier frequency and the first lower sideband frequency is used as the second frequency difference; The average value of the first frequency difference and the second frequency difference is used as the estimated value of the vibration frequency of the reactor.

[0112] In some possible implementations, the second estimation module 404 is specifically used for: Based on the sideband component information, determine the first amplitude of the first target order sideband component and the second amplitude of the second target order sideband component; The ratio of the second amplitude to the first amplitude is taken as the target sideband amplitude ratio; Based on the preset correspondence between the sideband amplitude ratio and the duty cycle parameter, the target duty cycle parameter value corresponding to the target sideband amplitude ratio is determined, and the target duty cycle parameter value is used as the duty cycle estimate.

[0113] In some possible implementations, the detection module 405 is specifically used for: Based on the estimated vibration frequency, the calibration frequency range to which the estimated vibration frequency belongs is determined; Based on the estimated frequency range and the calibrated frequency interval, a mapping table corresponding to the estimated frequency range is determined; wherein, the mapping relationship represents the correspondence between the duty cycle parameter and the vibration acceleration; The vibration acceleration of the reactor is determined based on the duty cycle estimate and the mapping table.

[0114] The reactor vibration detection device according to the embodiments of this application can correspondingly execute the method described in the embodiments of this application, and the other operations and / or functions of each module / unit of the reactor vibration detection device are respectively for realizing Figure 1 For the sake of brevity, the corresponding processes of each method in the illustrated embodiments will not be described in detail here.

[0115] This application also provides a computing device. For example... Figure 5 As shown in the figure, this is a schematic diagram of a computing device provided in an embodiment of this application. The computing device 400 includes a bus 401, a processor 402, a communication interface 403, and a memory 404. The processor 402, the memory 404, and the communication interface 403 communicate with each other via the bus 401.

[0116] Bus 401 can be a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus, etc. Buses can be categorized as address buses, data buses, control buses, etc. For ease of representation, Figure 5 The bus is represented by a single thick line, but this does not mean that there is only one bus or one type of bus.

[0117] Processor 402 can be any one or more of the following processors: central processing unit (CPU), graphics processing unit (GPU), microprocessor (MP), or digital signal processor (DSP).

[0118] The communication interface 403 is used for communication with external devices. For example, if the computing device is a first switch, the communication interface 403 can be used for communication between the first switch and a first user terminal, or for communication between the first switch and a second switch.

[0119] Memory 404 may include volatile memory, such as random access memory (RAM). Memory 404 may also include non-volatile memory, such as read-only memory (ROM), flash memory, hard disk drive (HDD), or solid state drive (SSD).

[0120] The memory 404 stores executable code, and the processor 402 executes the executable code to perform the aforementioned reactor vibration detection method.

[0121] Specifically, in achieving Figure 4 In the case of the illustrated embodiment, and Figure 4 When the modules or units of the reactor vibration detection device described in the embodiment are implemented by software, the following steps are performed: Figure 4 The software or program code required for the functions of each module / unit can be partially or entirely stored in memory 404. Processor 402 executes the program code corresponding to each unit stored in memory 404 to execute the aforementioned reactor vibration detection method.

[0122] This application also provides a computer-readable storage medium. The computer-readable storage medium can be any available medium that a computing device can store, or a data storage device such as a data center containing one or more available media. The available medium can be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., solid-state drive). The computer-readable storage medium includes instructions that instruct the computing device to perform the aforementioned reactor vibration detection method.

[0123] This application also provides a computer program product comprising one or more computer instructions. When the computer instructions are loaded and executed on a computing device, all or part of the processes or functions described in this application are generated.

[0124] The computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer instructions may be transmitted from one website, computer, or data center to another website, computer, or data center via wired (e.g., coaxial cable, fiber optic) or wireless (e.g., infrared, wireless, microwave, etc.) means.

[0125] When the computer program product is executed by a computer, the computer performs any of the aforementioned reactor vibration detection methods. The computer program product can be a software installation package; when any of the aforementioned reactor vibration detection methods needs to be used, the computer program product can be downloaded and executed on the computer.

[0126] The descriptions of the processes or structures corresponding to the above figures each have their own emphasis. For parts of a process or structure that are not described in detail, please refer to the relevant descriptions of other processes or structures.

[0127] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions within the technical scope disclosed in this application should be covered within the scope of protection of this application.

Claims

1. A method for detecting reactor vibration, characterized in that, The method includes: Obtain the electrical drive signal converted from the mechanical vibration of the reactor; Based on the electric drive signal, the working state of the passive vibration measurement circuit is controlled to perform frequency multiplication and amplitude modulation on the input radio frequency excitation signal to obtain a modulated harmonic signal. The modulated harmonic signal is subjected to spectral analysis to obtain carrier component and sideband component information, and the estimated value of the reactor's vibration frequency is determined based on the carrier component and sideband component information. Based on the sideband component information, an inversion calculation is performed to determine the duty cycle estimate corresponding to the electric drive signal; wherein, the duty cycle estimate characterizes the proportion of the passive vibration measurement circuit controlled by the electric drive signal during conduction time. Based on the estimated vibration frequency and the estimated duty cycle, the vibration acceleration of the reactor is obtained by querying the preset calibration relationship.

2. The method according to claim 1, characterized in that, The acquisition of the electrical drive signal converted from the mechanical vibration of the reactor includes: An electric drive signal converted from mechanical vibration is obtained by using a piezoelectric cantilever fixed to a vibration-sensitive point on the reactor housing.

3. The method according to claim 1, characterized in that, The passive vibration measurement circuit includes a frequency doubling diode unit and a controlled DC path unit; the frequency doubling diode unit is used to convert the input radio frequency excitation signal into a second harmonic signal; the on / off state of the controlled DC path unit is controlled by the electric drive signal, which is used to switch the DC bias state of the frequency doubling diode unit.

4. The method according to claim 3, characterized in that, The step of controlling the operating state of the passive vibration measurement circuit based on the electric drive signal to perform frequency multiplication and amplitude modulation on the input radio frequency excitation signal to obtain a modulated harmonic signal includes: When the instantaneous value of the electric drive signal is greater than a preset first voltage, the controlled DC path unit is turned on; otherwise, the controlled DC path unit is turned off. When the controlled DC path unit is turned on, the frequency doubling diode unit is in a first DC bias state, and a second harmonic signal with a first amplitude is obtained; When the controlled DC path unit is turned off, the frequency doubling diode unit is in a second DC bias state, resulting in a second harmonic signal with a second amplitude. Based on the second harmonic signal, the modulated harmonic signal is obtained.

5. The method according to claim 1, characterized in that, The step of performing spectral analysis on the modulated harmonic signal to obtain carrier component and sideband component information, and determining the estimated value of the reactor's vibration frequency based on the carrier component and sideband component information, includes: Spectral analysis is performed on the modulated harmonic signal to obtain the carrier frequency corresponding to the carrier component, the first upper sideband frequency corresponding to the first upper sideband component, and the first lower sideband frequency corresponding to the first lower sideband component. The difference between the first upper sideband frequency and the carrier frequency is taken as the first frequency difference; The difference between the carrier frequency and the first lower sideband frequency is used as the second frequency difference; The average value of the first frequency difference and the second frequency difference is used as the estimated value of the vibration frequency of the reactor.

6. The method according to claim 1, characterized in that, The step of performing inversion calculations based on the sideband component information to determine the duty cycle estimate of the duty cycle parameter includes: Based on the sideband component information, determine the first amplitude of the first target order sideband component and the second amplitude of the second target order sideband component; The ratio of the second amplitude to the first amplitude is taken as the target sideband amplitude ratio; Based on the preset correspondence between the sideband amplitude ratio and the duty cycle parameter, the target duty cycle parameter value corresponding to the target sideband amplitude ratio is determined, and the target duty cycle parameter value is used as the duty cycle estimate.

7. The method according to claim 1, characterized in that, The step of obtaining the vibration acceleration of the reactor by querying a preset calibration relationship based on the estimated vibration frequency and the estimated duty cycle includes: Based on the estimated vibration frequency, the calibration frequency range to which the estimated vibration frequency belongs is determined; Based on the estimated frequency range and the calibrated frequency interval, a mapping table corresponding to the estimated frequency range is determined; wherein, the mapping relationship represents the correspondence between the duty cycle parameter and the vibration acceleration; The vibration acceleration of the reactor is determined based on the duty cycle estimate and the mapping table.

8. A reactor vibration detection device, characterized in that, The device includes: The acquisition module is used to acquire the electric drive signal converted from the mechanical vibration of the reactor; The modulation module is used to control the working state of the passive vibration measurement circuit based on the electric drive signal, so as to perform frequency multiplication and amplitude modulation on the input radio frequency excitation signal to obtain the modulated harmonic signal. The first estimation module is used to perform spectral analysis on the modulated harmonic signal to obtain carrier component and sideband component information, and to determine the estimated value of the reactor's vibration frequency based on the carrier component and sideband component information. The second estimation module is used to perform inversion calculations based on the sideband component information to determine the duty cycle estimate value corresponding to the electric drive signal; wherein, the duty cycle estimate value characterizes the proportion of the conduction time of the passive vibration measurement circuit controlled by the electric drive signal; The detection module is used to query a preset calibration relationship based on the vibration frequency estimate and the duty cycle estimate to obtain the vibration acceleration of the reactor.

9. A computing device, characterized in that, Including memory and processor; The memory stores one or more computer programs, the one or more computer programs including instructions; when the instructions are executed by the processor, the computing device performs the method as described in any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium is used to store a computer program for performing the method as described in any one of claims 1 to 7.

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