Optical fiber current sensing ring vibration suppression method and device based on multi-degree-of-freedom active vibration isolation support array
By using a multi-degree-of-freedom active vibration isolation bracket array and real-time control technology, the vibration suppression problem of fiber optic current sensors in complex vibration environments has been solved, improving the measurement accuracy and stability of the sensors.
Patent Information
- Application Number
- CN202510961253.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-13
- Publication Date
- 2025-11-28
AI Technical Summary
Existing passive vibration isolation technologies have limited effectiveness in suppressing high-frequency vibrations and complex vibration environments, affecting the accuracy and stability of fiber optic current sensors.
A multi-degree-of-freedom active vibration isolation bracket array is adopted, combined with vibration sensors, controllers and drive mechanisms, to monitor and generate anti-phase control signals in real time. The attitude and position of the vibration isolation bracket are adjusted by piezoelectric ceramic actuators to counteract the influence of external vibrations.
It achieves vibration suppression in three-dimensional space, improves the measurement accuracy and stability of fiber optic current sensors, and is suitable for complex vibration environments.
Smart Images
Figure CN121027952A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of fiber optic current sensor technology, and specifically relates to a method and device for vibration suppression of fiber optic current sensing ring based on a multi-degree-of-freedom active vibration isolation support array. Background Technology
[0002] Fiber optic current sensors (FOCTs) offer advantages such as small size, light weight, easy transportation and installation, and compact structure. Compared to traditional current sensors, they save a significant amount of metal materials, such as iron cores, and reduce floor space. Furthermore, when measuring current, simply flexibly looping the optical fiber and placing it on the object being measured allows the fiber loop to encompass all current channels, ensuring accurate measurement. This simplifies installation and reduces the complexity of manual setup.
[0003] However, in practical applications, external environmental vibrations (such as mechanical vibrations and wind vibrations) can cause measurement errors in the fiber optic current sensing loop, severely affecting the accuracy and stability of the fiber optic current sensor. Existing passive vibration isolation technologies mainly rely on mechanical structures to absorb or isolate vibrations, but this type of vibration isolation technology has limited effectiveness in suppressing high-frequency vibrations and is difficult to adapt to complex and variable vibration environments.
[0004] Therefore, a method and device for vibration suppression of fiber optic current sensing loop based on multi-degree-of-freedom active vibration isolation bracket array has been found, which can actively suppress vibration. This is of great significance for improving the stability and measurement accuracy of FOCT and will help promote the application of FOCT in the field of current detection. Summary of the Invention
[0005] The problem to be solved by this invention is to provide a method and device for vibration suppression of fiber optic current sensing loop based on a multi-degree-of-freedom active vibration isolation support array, which can realize vibration suppression in three-dimensional space, effectively suppress the interference of external vibration on fiber optic current sensing loop, and improve the measurement accuracy and stability of the sensor.
[0006] The present invention adopts the following technical solution: a vibration suppression device for an optical fiber current sensing ring based on a multi-degree-of-freedom active vibration isolation bracket array, comprising: an optical fiber current sensing ring shell, a multi-degree-of-freedom active vibration isolation bracket array, a vibration sensor, a controller, a drive mechanism, and a sensing optical fiber.
[0007] The outer shell of the fiber optic current sensing ring is disposed on the outer ring of the fiber optic current sensing ring and is fixed to the outside of the multi-degree-of-freedom active vibration isolation support array by a flexible connector.
[0008] The multi-degree-of-freedom active vibration isolation bracket array includes multiple vibration isolation units that support and isolate the fiber optic current sensing ring.
[0009] The vibration sensor is arranged in the inner ring of the fiber optic current sensing ring to monitor environmental vibration in real time and send vibration signals to the controller. The controller receives the vibration signals and generates control commands, which are then used to drive the mechanism to adjust the attitude and position of the multi-degree-of-freedom active vibration isolation support array to achieve active vibration isolation of the fiber optic current sensing ring.
[0010] The sensing optical fiber connects to each vibration isolation unit and is used to measure the amplitude of DC or AC current signals.
[0011] Preferably, in the multi-degree-of-freedom active vibration isolation bracket array, there are 8 vibration isolation units, which are evenly arranged in the inner ring of the fiber optic current sensing ring.
[0012] Preferably, each vibration isolation unit is independently controlled and has multiple degrees of freedom, and local vibration isolation adjustment is performed according to local vibration signals to achieve vibration suppression in three dimensions of the fiber optic current sensing ring.
[0013] Preferably, each vibration isolation unit includes: a support structure and a piezoelectric ceramic and a displacement sensor disposed on the support structure;
[0014] The piezoelectric ceramics are disposed on both sides of the light sensor, and the attitude and position of the active vibration isolation bracket array are adjusted by the driver according to the control command.
[0015] The displacement sensor is used to provide feedback on the actual displacement of the vibration isolation unit.
[0016] Preferably, there are multiple vibration sensors, which are respectively arranged outside each vibration isolation unit to collect the vibration signal of each vibration isolation unit in real time.
[0017] Preferably, the controller generates control commands based on the signals from the vibration sensor to counteract the effects of external vibrations on the fiber optic current sensing loop.
[0018] The present invention also provides: a method for suppressing vibration of an optical fiber current sensing loop based on a multi-degree-of-freedom active vibration isolation support array, applicable to any of the above-mentioned current sensing loop vibration suppression devices, comprising the following steps:
[0019] Step 1: Monitor the vibration acceleration signals of each vibration isolation unit in the x-axis and y-axis directions in real time using the vibration sensor in the inner ring of the sensing ring: {a i,j (t), i=1,2,…,8,j=1,2};
[0020] Step 2: Integrate the vibration acceleration signal to obtain the velocity signal {v} i,j {(t), i=1,2,…,8,j=1,2} and displacement signal {s} i,j The data (t), i = 1, 2, ..., 8, j = 1, 2} are transmitted to the controller;
[0021] Step 3: The controller determines the displacement s based on the displacement s. i,j (t) and control gain k, generate inverted control signal {u i,j (t), j = 1, 2, ..., 4};
[0022] Step 4, Inverting control signal u i,j (t) is applied to the vibration isolation unit by the piezoelectric ceramic actuator, generating a corresponding displacement Δx(t) to counteract the influence of external vibration;
[0023] Step 5: The displacement sensor monitors the actual displacement of the vibration isolation unit in real time and compares it with the target displacement to generate an error signal e(t). Based on the error signal e(t), the controller uses a sliding diaphragm control method to dynamically adjust the control gain k and optimize the control effect.
[0024] Preferably, the inverting control signal u in step 3 i,j (t), calculated as follows:
[0025] u i,j (t)=±x i,j (t) / k
[0026] Wherein, the ± symbols are respectively connected to the measured vibration signal a via the x-axis reference direction and the y-axis reference direction. i,j (t) determines whether they are in the same direction, where k is the control gain.
[0027] Preferably, the displacement Δx(t) in step 4 is calculated as follows:
[0028] Δx(t)=k p u(t)
[0029] Where, k p is the gain coefficient of the piezoelectric ceramic driver.
[0030] Preferably, the error signal e(t) in step 5 is calculated as follows:
[0031] e(t) = x target (t)-x actual (t)
[0032] Where, x actual (t) represents the actual displacement of the vibration isolation unit, x target (t) represents the target displacement of the vibration isolation unit.
[0033] Preferably, each vibration isolation unit of the multi-degree-of-freedom active vibration isolation bracket array can be controlled independently, and can be adjusted locally according to local vibration signals.
[0034] Compared with the prior art, the present invention, employing the above technical solution, has the following technical effects:
[0035] 1. The fiber optic current sensing ring vibration suppression device of the present invention can achieve three-dimensional vibration suppression through a multi-degree-of-freedom active vibration isolation bracket array, adapting to complex vibration environments; the vibration sensor adopts a MEMS accelerometer, which has the advantages of small size, low power consumption, and high sensitivity, and can accurately measure minute vibration acceleration; the piezoelectric ceramic actuator generates corresponding displacement according to the control signal, accurately adjusting the attitude and position of the vibration isolation bracket, with fast response speed and high accuracy.
[0036] 2. The fiber optic current sensing ring vibration suppression device of the present invention monitors environmental vibration in real time through a vibration sensor, acquires vibration signals, transmits the vibration signals to a controller to generate control commands, and adjusts the posture and position of the vibration isolation bracket through a drive mechanism to counteract the influence of external vibration, and provides real-time feedback on the vibration isolation effect, optimizes control commands, and achieves dynamic vibration suppression.
[0037] 3. The fiber optic current sensing ring vibration suppression method of the present invention effectively suppresses the interference of high-frequency vibration and complex vibration environment on the fiber optic current sensing ring through active control technology, which can significantly improve the measurement accuracy and stability of the sensor and is applicable to power systems and other high-precision measurement fields. Attached Figure Description
[0038] Figure 1 This is a schematic diagram of the overall structure of the fiber optic current sensing ring vibration suppression device of the present invention;
[0039] Figure 2 This is a top view of the multi-degree-of-freedom active vibration isolation support array structure of the present invention;
[0040] Figure 3 This is a cross-sectional view of the multi-degree-of-freedom active vibration isolation support array structure of the present invention;
[0041] Figure 4 This is a flowchart of the vibration suppression method of the present invention. Detailed Implementation
[0042] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of the application will be further described in detail below with reference to the accompanying drawings. The described embodiments are only a part of the embodiments involved in this invention. All non-innovative embodiments based on these embodiments by other researchers in the art are within the protection scope of this invention. Furthermore, the step numbers in the embodiments of this invention are only set for ease of explanation and do not limit the order of the steps. The execution order of each step in the embodiments can be adaptively adjusted according to the understanding of those skilled in the art.
[0043] In one embodiment of the present invention, a vibration suppression device for an optical fiber current sensing ring based on a multi-degree-of-freedom active vibration isolation bracket array comprises: an optical fiber current sensing ring housing 1, a multi-degree-of-freedom active vibration isolation bracket array 2, a vibration sensor 3, a controller, a drive mechanism 5, and a sensing optical fiber 6.
[0044] like Figure 1 As shown, the fiber optic current sensing ring housing 1 protects the fiber optic current sensing ring and is fixed to the outside of the multi-degree-of-freedom active vibration isolation bracket array by a flexible connector.
[0045] The multi-degree-of-freedom active vibration isolation bracket array 2 supports and isolates the fiber optic current sensing ring, and adjusts its attitude and position according to the control commands issued by the controller to achieve active vibration isolation of the fiber optic current sensing ring.
[0046] Vibration sensor 3 is arranged around the inner ring of the fiber optic current sensing ring to collect vibration signals in real time and transmit them to the controller to monitor environmental vibration in real time; the controller receives the vibration signals from the vibration sensor 3 and generates control commands, which are transmitted to the drive mechanism 5; the drive mechanism 5 adjusts the attitude and position of the multi-degree-of-freedom active vibration isolation bracket array 2; the sensing fiber 6 measures the current signal.
[0047] Furthermore, in this embodiment, as Figure 2 and Figure 3 As shown, the multi-degree-of-freedom active vibration isolation bracket array 2 consists of 8 independently controllable vibration isolation units, and each vibration isolation unit has multiple degrees of freedom, which can realize vibration suppression in three dimensions of the fiber optic current sensing ring.
[0048] The vibration isolation support unit includes: piezoelectric ceramic 2-1, displacement sensor 2-2 and support structure 2-3. The piezoelectric ceramic 2-1 dynamically and precisely adjusts the attitude and position of the multi-degree-of-freedom active vibration isolation support array according to the control command through the driver, so as to offset the influence of external vibration on the sensing ring. The displacement sensor 2-2 is used to feed back the actual displacement of the vibration isolation unit.
[0049] The controller generates control commands based on the signals from the vibration sensor 3 to counteract the influence of external vibrations on the fiber optic current sensing ring. The vibration sensor 3 is arranged around the fiber optic current sensing ring to collect multidimensional vibration signals in real time.
[0050] The workflow of this embodiment is as follows: Vibration sensor 3 monitors environmental vibration in real time and transmits the signal to the controller. The controller performs spectrum analysis on the signal to identify the main vibration frequency and generates an inverse control signal. Drive mechanism 5 adjusts the posture and position of vibration isolation bracket according to control instructions to counteract the influence of external vibration. At the same time, displacement sensor 2-2 provides real-time feedback on the vibration isolation effect. Controller 4 further optimizes control instructions based on the feedback signal, thereby achieving efficient vibration isolation.
[0051] As can be seen, the fiber optic current sensing loop vibration suppression device in this embodiment monitors environmental vibration in real time through vibration sensors. The controller calculates control commands based on the vibration signals and drives the mechanism to adjust the attitude and position of the vibration isolation bracket, thereby achieving active vibration isolation of the fiber optic current sensing loop. At the same time, the multi-degree-of-freedom active vibration isolation bracket array consists of multiple independently controllable vibration isolation units, each with multiple degrees of freedom, enabling vibration suppression in three-dimensional space. Furthermore, by monitoring environmental vibration in real time and actively adjusting the attitude and position of the vibration isolation bracket, the device effectively suppresses interference from external vibrations on the fiber optic current sensing loop, improving the measurement accuracy and stability of the sensor.
[0052] Furthermore, based on the aforementioned fiber optic current sensing loop vibration suppression device, this embodiment also provides a method for suppressing fiber optic current sensing loop vibration based on a multi-degree-of-freedom active vibration isolation support array, the implementation process of which is as follows: Figure 4 As shown.
[0053] Step 1: Vibration signal acquisition and processing:
[0054] With preset positive x-axis and positive y-axis reference directions, the vibration sensor uses a MEMS accelerometer to collect environmental acceleration vibration signals in real time from 8 measuring points in 4 directions. i,j (t), i=1,2,…,8,j=1,2 (j=1 represents the x-axis direction, j=2 represents the y-axis direction)}.
[0055] Specifically, if the acceleration a i,1 If the direction is opposite to the x-axis reference direction, then a i,1 <0;
[0056] If a i,1 If the direction is the same as the x-axis reference direction, then a i,1 >0;
[0057] If the acceleration a i,2 If the direction is opposite to the y-axis reference direction, then a i,2 <0;
[0058] If a i,2 If the direction is the same as the y-axis reference direction, then a i,2 >0.
[0059] Step 2, Vibration signal processing:
[0060] Based on the output acceleration vibration signals from the MEMS accelerometers at 8 measuring points in 4 directions {a i,j The velocity {v} is obtained by integrating the {t}, i = 1, 2, ..., 8, j = 1, 2}. i,j {t, i = 1, 2, ..., 8, j = 1, 2} and displacement {s} i,j(t), i=1,2,…,8,j=1,2}, that is:
[0061] v i,j (t)=∫a i,j (t)dt
[0062] s i,j (t)=∫v i,j (t)dt
[0063] When subjected to external pressure, the pressure sensors on both sides of the optical fiber change from tension to compression, and from compression to stretching, respectively. Specifically, when external vibrations act on the optical fiber current sensing loop, the pressure sensors on both sides of the fiber will sense stretching and compressing forces, respectively. The sensor on the stretching side outputs a positive voltage signal, and the sensor on the compressing side outputs a negative voltage signal. These signals are amplified and processed before being input into the controller for further analysis and control.
[0064] Step 3: Control signal generation:
[0065] The controller is based on the displacement s i,j (t), generating an inverting control signal {u i,j (t), j = 1, 2, ..., 4}, that is:
[0066] u i,j (t)=±x i,j (t) / k
[0067] For piezoelectric ceramics in the x-direction, the control signal calculation method is as follows:
[0068] If a i,1 >0, then:
[0069] u i,1 (t)=-x i,1 (t) / k
[0070] u i,2 (t)=x i,1 (t) / k
[0071] If a i,1 <0, then:
[0072] u i,1 (t)=x i,1 (t) / k
[0073] u i,2 (t)=-x i,1 (t) / k
[0074] If a i,2 >0, then:
[0075] u i,3 (t)=-xi,2 (t) / k
[0076] u i,4 (t)=x i,2 (t) / k
[0077] If a i,2 <0, then:
[0078] u i,3 (t)=x i,2 (t) / k
[0079] u i,4 (t)=-x i,2 (t) / k
[0080] Where k is the control gain, and the initial value of k is related to the gain coefficient k of the piezoelectric ceramic actuator. p same.
[0081] Step 4, Piezoelectric ceramic actuator control:
[0082] Based on control signal u i,j (t) The attitude and position of the multi-degree-of-freedom active vibration isolation support array are adjusted by piezoelectric ceramics to counteract the influence of external vibration on the fiber optic current sensing ring.
[0083] In this embodiment, the control signal u i,j (t) is applied to the vibration isolation unit through a piezoelectric ceramic actuator, generating a corresponding displacement Δx(t) to counteract the influence of external vibration:
[0084] Δx(t)=k p u(t)
[0085] Where, k p is the gain coefficient of the piezoelectric ceramic driver.
[0086] Step 5: Optimize the dynamic gain coefficient k;
[0087] It provides real-time feedback on vibration isolation effects and achieves dynamic vibration suppression through control commands.
[0088] Furthermore, in this embodiment, the displacement sensor 2-2 is a strain gauge attached to the surface of the piezoelectric ceramic to monitor the actual displacement x of the vibration isolation unit in real time. actual (t), and the target displacement x target Compare (t) to generate the error signal e(t):
[0089] e(t) = x target (t)-x actual (t)
[0090] The controller uses a sliding diaphragm control method to dynamically adjust the control gain k based on the error signal e(t) to optimize the control effect.
[0091] It should be noted that in this embodiment, each vibration isolation unit of the multi-degree-of-freedom active vibration isolation bracket array 2 can be controlled independently and can be adjusted locally according to the local vibration signal.
[0092] In summary, this invention provides a method and apparatus for vibration suppression of an optical fiber current sensing loop based on a multi-degree-of-freedom active vibration isolation bracket array. The method uses vibration sensors to monitor environmental vibration in real time, and a controller generates an inverse control signal to drive a piezoelectric ceramic actuator to precisely adjust the attitude and position of the vibration isolation bracket, thereby effectively counteracting the influence of external vibrations on the optical fiber current sensing loop. Simultaneously, the control effect is further optimized by measuring signals from pressure sensors on both sides of the optical fiber, achieving highly efficient vibration isolation.
[0093] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platform, or of course by hardware.
[0094] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims
1. A fiber-optic current sensor ring vibration suppression device based on an array of multi-degree-of-freedom active vibration isolation mounts, characterized by, It comprises: a fiber current sensing ring shell (1), a multi-degree-of-freedom active vibration isolation support array (2), a vibration sensor (3), a controller, a driving mechanism (5), and a sensing fiber (6); The fiber current sensing ring shell (1) is arranged on the outer ring of the fiber current sensing ring and is fixed to the outside of the multi-degree-of-freedom active vibration isolation support array (2) through a flexible connecting piece; The multi-degree-of-freedom active vibration isolation support array (2) comprises a plurality of vibration isolation units, supports and isolates the fiber current sensing ring; The vibration sensor (3) is arranged on the inner ring of the fiber current sensing ring, monitors the environmental vibration in real time, and sends the vibration signal to the controller; the controller receives the vibration signal to generate a control instruction, adjusts the posture and position of the multi-degree-of-freedom active vibration isolation support array (2) through the driving mechanism (5), and realizes active vibration isolation of the fiber current sensing ring; The sensing fiber (6) is connected to each vibration isolation unit, and the sensing fiber (6) is used to measure the amplitude of the direct current or alternating current signal.
2. The ring vibration suppression device based on the array of multi-degree-of-freedom active vibration isolation mounts for fiber-optic current sensors according to claim 1, characterized in that, In the multi-degree-of-freedom active vibration isolation support array (2), there are 8 vibration isolation units, which are uniformly arranged on the inner ring of the fiber current sensing ring.
3. The ring vibration suppression device based on the array of multi-degree-of-freedom active vibration isolation mounts for fiber-optic current sensors according to claim 2, characterized in that, Each vibration isolation unit is independently controlled and has multiple degrees of freedom, and adjusts the local vibration according to the local vibration signal to realize vibration suppression in three dimensions of the fiber current sensing ring.
4. The ring vibration suppression device based on the array of multi-degree-of-freedom active vibration isolation mounts for fiber-optic current sensors according to claim 3, characterized in that, Each vibration isolation unit comprises a support structure (2-3), a piezoelectric ceramic (2-1) arranged on the support structure (2-3), and a displacement sensor (2-2); The piezoelectric ceramic (2-1) is arranged on both sides of the sensing fiber (6), and the driving mechanism adjusts the posture and position of the multi-degree-of-freedom active vibration isolation support array (2) according to the control instruction; The displacement sensor (2-2) is used to feedback the actual displacement of the vibration isolation unit.
5. The multi-degree-of-freedom active isolation mount array based fiber optic current sensor ring vibration suppression apparatus according to claim 1, wherein, There are a plurality of vibration sensors (3), which are arranged outside each vibration isolation unit to collect the vibration signal of each vibration isolation unit in real time.
6. The multi-degree-of-freedom active isolation mount array based fiber optic current sensor ring vibration suppression apparatus according to claim 4, wherein, The controller generates a control instruction according to the signal of the vibration sensor (3) to offset the influence of external vibration on the fiber current sensing ring.
7. A method for fiber-optic current sensor ring vibration suppression based on a multi-degree-of-freedom active vibration isolation mount array, applied to the current sensor ring vibration suppression device of any one of claims 1 to 6, characterized in that, It comprises the following steps: Step 1, real-time monitoring of the vibration acceleration signals of each vibration isolation unit in the x-axis and y-axis directions by the inner ring vibration sensor (3) of the sensing ring:{a i,j (t),i = 1,2,…,8,j = 1,2}. Step 2, integrate the vibration acceleration signal to obtain the velocity signal {v i,j (t),i = 1,2, …, 8, j = 1,2} and displacement signal {s i,j (t),i = 1,2, …, 8, j = 1,2} to the controller; Step 3, the controller generates the control signal {u i,j (t) based on the displacement s i,j (t) and the control gain k, and generates the anti-phase control signal {u i,j (t), j = 1, 2, …, 4}. Step 4, reverse control signal u i,j (t) The corresponding displacement Δx(t) is generated by the driver of the piezoelectric ceramic (2-1) applied to the vibration isolation unit to offset the influence of external vibration; Step 5, the displacement sensor (2-2) monitors the actual displacement of the vibration isolation unit in real time, compares it with the target displacement, generates an error signal e(t), and the controller dynamically adjusts the control gain k according to the error signal e(t) using the sliding film control method to optimize the control effect.
8. The method of claim 7, wherein the array of multiple degree-of-freedom active vibration isolation mounts is configured to provide a force to the optical fiber to reduce the vibration of the optical fiber. The reverse control signal u in step 3 i,j (t) is calculated as follows: u i,j (t) = ±x i,j (t) / k wherein the ± signs respectively indicate the x-axis reference direction, the y-axis reference direction, and the measured vibration signal a i,j (t) whether the same direction is determined, k is the control gain.
9. The method of claim 7, wherein the array of multiple degree-of-freedom active vibration isolation mounts is configured to provide a force to the fiber optic current sensor to reduce the vibration of the fiber optic current sensor. The displacement Δx(t) in step 4 is calculated as follows: Δx(t) = k p u(t) where k p is the piezoceramic driver gain coefficient.
10. The method of claim 7, wherein the array of multiple degree-of-freedom active vibration isolation mounts is configured to provide a force to the fiber optic current sensor to reduce the vibration of the fiber optic current sensor. The error signal e(t) in step 5 is calculated as follows: e(t) = x target (t) - x actual (t) where x actual (t) is the actual displacement of the vibration isolation unit, x target (t) is the target displacement of the vibration isolation unit.