Vibration response calibration device of intelligent cable

Abstract

The invention discloses a vibration response calibration device for an intelligent cable. The device comprises a signal generator, a vibration exciter, a six-axis Bluetooth sensor, a demodulator and an upper computer, the signal generator is used for generating a vibration signal according to a preset vibration frequency and transmitting the vibration signal to the vibration exciter; the vibration exciter is used for applying vibration to the intelligent cable according to the vibration signal and the current vibration amplitude; the six-axis Bluetooth sensor is used for measuring a first acceleration and an angular velocity of the intelligent cable and transmitting the angular velocity to the upper computer; the demodulator is used for measuring the second acceleration of each measurement point when the first acceleration is the same as the preset acceleration, and transmitting the second acceleration to the upper computer; the upper computer is used for carrying out vibration response calibration on the intelligent cable according to the angular velocity and the second acceleration; the vibration exciter is further used for adjusting the vibration amplitude and applying vibration again when the first acceleration is not equal to the preset acceleration. According to the invention, the calibration of the vibration response of the intelligent cable can be realized.

Description

Technical Field

[0001] The present invention relates to the field of intelligent cables, and in particular to a vibration response calibration device for intelligent cables. Background Art

[0002] As the main component of the power grid, overhead transmission lines are characterized by numerous points, wide areas, long spans, and complex and changeable natural environment and terrain conditions. Under the action of wind excitation, the transmission lines are always in a state of vibration. The abnormal vibration state poses a huge threat to the safe operation of UHV transmission lines, especially when affected by ice and snow disasters.

[0003] Since smart cables are made of a new type of weak grating array engraved into optical fiber and are rarely used in the market, there is currently no device to calibrate smart cables. Summary of the invention

[0004] The invention provides a vibration response calibration device for an intelligent cable, which can realize the calibration of the vibration response of the intelligent cable.

[0005] An embodiment of the present invention provides a vibration response calibration device for a smart cable, comprising:

[0006] Signal generator, vibrator, six-axis Bluetooth sensor, demodulator, and host computer;

[0007] The signal generator is connected to the vibration exciter, the smart cable to be calibrated is straightened and placed horizontally on the vibration exciter, the six-axis Bluetooth sensor is horizontally installed on each measuring point of the smart cable at a preset interval, and one end of the smart cable is connected to the demodulator; wherein each measuring point corresponds to a vibration exciter and a six-axis Bluetooth sensor respectively;

[0008] The signal generator is used to generate a vibration signal according to a preset vibration frequency and transmit the vibration signal to the vibration exciter;

[0009] The vibration exciter is used to apply vibration to the smart cable according to the vibration signal and the current vibration amplitude after receiving the vibration signal, so as to make the smart cable vibrate;

[0010] The six-axis Bluetooth sensor is used to measure the first acceleration of the smart cable when it vibrates, and when the measured first acceleration is the same as the preset acceleration, measure the angular velocity of each measuring point, and transmit the angular velocity to the host computer;

[0011] The demodulator is used to measure the second acceleration of the optical fiber vibration at each measuring point when the first acceleration is the same as the preset acceleration, and transmit the second acceleration to the host computer;

[0012] The host computer is used to calibrate the vibration response of the smart cable according to the angular velocity and the second acceleration;

[0013] The vibration exciter is further used to update the current vibration amplitude when the first acceleration is different from the preset acceleration, and re-apply vibration to the smart cable according to the vibration signal and the updated vibration amplitude.

[0014] Further, the performing vibration response calibration on the smart cable according to the angular velocity and the second acceleration includes:

[0015] Performing Fourier transform on the second acceleration to obtain the vibration response frequency of each measuring point of the smart cable;

[0016] Using the second acceleration as the vibration response amplitude of each measuring point of the smart cable;

[0017] The vibration response of the smart cable is calibrated according to the vibration response frequency, the vibration response amplitude and the angular velocity.

[0018] Furthermore, the host computer is also used for:

[0019] According to the vibration response frequency and the preset vibration frequency, the vibration distortion degree of each measuring point of the smart cable is calculated;

[0020] A distortion calibration result of the smart cable is obtained according to the vibration distortion.

[0021] Furthermore, the host computer is also used for:

[0022] The vibration restoration degree of each measuring point of the smart cable is calculated according to the vibration response amplitude and the vibration amplitude corresponding to the vibration response amplitude;

[0023] According to the vibration restoration degree, a restoration degree calibration result of the smart cable is obtained.

[0024] Furthermore, the host computer is also used for:

[0025] Obtaining a third acceleration measured by the six-axis Bluetooth sensor at different preset frequencies that is the same as the preset acceleration, and a fourth acceleration of the optical fiber vibration at each measuring point when the smart cable is under the third acceleration;

[0026] Obtaining a first frequency response curve according to the different preset frequencies and the third acceleration;

[0027] Obtaining a second frequency response curve according to the different preset frequencies and the fourth acceleration;

[0028] Extracting a first frequency range when the first frequency response curve and the second frequency response curve are in a linear relationship, and a second frequency range when the first frequency response curve and the second frequency response curve are in a nonlinear relationship;

[0029] A frequency response range index of the smart cable is obtained according to the first frequency range and the second frequency range.

[0030] Furthermore, the host computer is also used for:

[0031] Obtaining a vibration amplitude corresponding to the second acceleration;

[0032] Calculating the response sensitivity of each measuring point according to the vibration amplitude and the second acceleration;

[0033] According to the response sensitivity, the response sensitivity of the smart cable is obtained.

[0034] Furthermore, the host computer is also used for:

[0035] Acquire the mass of the smart cable and the cross-sectional area of ​​the smart cable within a preset time period;

[0036] Calculating a dynamic load at each measuring point of the smart cable according to the second acceleration and the mass;

[0037] Calculating the stress at each measuring point according to the dynamic load and the cross-sectional area;

[0038] The fatigue life of the smart cable is obtained according to the stress and the preset SN curve.

[0039] Furthermore, the demodulator is a weak grating demodulator.

[0040] Furthermore, the determination of the preset distance includes:

[0041] Obtaining the weak grating spacing of the smart cable;

[0042] The weak grating spacing is used as the preset spacing.

[0043] Furthermore, the six-axis Bluetooth sensor is installed on each measuring point of the smart cable by bonding.

[0044] The embodiments of the present invention have the following beneficial effects:

[0045] The present invention provides a vibration response calibration device for an intelligent cable, the device comprising: a signal generator, an exciter, a six-axis Bluetooth sensor, a demodulator, and a host computer; the signal generator is connected to the exciter, the intelligent cable to be calibrated is straightened and horizontally placed on the exciter, the six-axis Bluetooth sensor is horizontally installed on each measuring point of the intelligent cable at a preset interval, and one end of the intelligent cable is connected to the demodulator; wherein each measuring point corresponds to an exciter and a six-axis Bluetooth sensor; the signal generator is used to generate a vibration signal according to a preset vibration frequency, and transmit the vibration signal to the exciter; the exciter is used to send a vibration signal to the intelligent cable according to the vibration signal and the current vibration amplitude after receiving the vibration signal. Vibration is applied to make the smart cable vibrate; the six-axis Bluetooth sensor is used to measure the first acceleration of the smart cable when it vibrates, and when the measured first acceleration is the same as the preset acceleration, the angular velocity of each measuring point is measured, and the angular velocity is transmitted to the host computer; the demodulator is used to measure the second acceleration of the optical fiber vibration at each measuring point when the first acceleration is the same as the preset acceleration, and the second acceleration is transmitted to the host computer; the host computer is used to calibrate the vibration response of the smart cable according to the angular velocity and the second acceleration; the exciter is also used to update the current vibration amplitude when the first acceleration is not the preset acceleration, and re-apply vibration to the smart cable according to the vibration signal and the updated vibration amplitude. Therefore, the present invention installs a six-axis Bluetooth sensor on the smart cable. The sensor is small in size and can simultaneously obtain acceleration data and angular velocity data reflecting the cable posture. The sensor can monitor in real time whether the cable has reached the expected vibration state. Then, the optical fiber vibration acceleration when the measured acceleration of the six-axis Bluetooth sensor is the same as the preset acceleration is used as the acceleration used to represent the vibration response of the smart cable. Finally, according to the angular velocity measured by the six-axis Bluetooth sensor and the optical fiber vibration acceleration obtained by the demodulator, the vibration response calibration of the smart cable is realized. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 It is a structural diagram of a vibration response calibration device for a smart cable provided in one embodiment of the present invention.

[0047] Figure 2 It is a schematic diagram of the linear installation of a six-axis Bluetooth sensor provided by an embodiment of the present invention.

[0048] Figure 3 It is a schematic diagram of acceleration measured by a single six-axis Bluetooth sensor provided by an embodiment of the present invention.

[0049] Figure 4 It is a schematic diagram of angular velocity measured by a single six-axis Bluetooth sensor provided by an embodiment of the present invention.

[0050] Figure 5 It is a schematic diagram of a ring-type installation of a six-axis Bluetooth sensor provided by an embodiment of the present invention.

[0051] Description of reference numerals: signal generator 1, demodulator 2, exciter 3, smart cable 4, six-axis Bluetooth sensor 5. DETAILED DESCRIPTION

[0052] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0053] like Figure 1 As shown, a vibration response calibration device of a smart cable 4 provided by an embodiment of the present invention includes:

[0054] Signal generator 1, exciter 3, six-axis Bluetooth sensor 5, demodulator 2, and host computer (not shown in the figure);

[0055] The signal generator 1 is connected to the vibration exciter 3, the smart cable 4 to be calibrated is straightened and placed horizontally on the vibration exciter 3, the six-axis Bluetooth sensor 5 is horizontally installed on each measuring point of the smart cable 4 at a preset interval, and one end of the smart cable 4 is connected to the demodulator 2; wherein each measuring point corresponds to a vibration exciter 3 and a six-axis Bluetooth sensor 5 respectively;

[0056] The signal generator 1 is used to generate a vibration signal according to a preset vibration frequency and transmit the vibration signal to the vibration exciter 3;

[0057] The vibration exciter 3 is used to apply vibration to the smart cable 4 according to the vibration signal and the current vibration amplitude after receiving the vibration signal, so as to make the smart cable 4 vibrate;

[0058] The six-axis Bluetooth sensor 5 is used to measure the first acceleration of the smart cable 4 when it vibrates, and when the measured first acceleration is the same as the preset acceleration, measure the angular velocity of each measuring point, and transmit the angular velocity to the host computer;

[0059] The demodulator 2 is used to measure the second acceleration of the optical fiber vibration at each measuring point when the first acceleration is the same as the preset acceleration, and transmit the second acceleration to the host computer;

[0060] The host computer is used to calibrate the vibration response of the smart cable 4 according to the angular velocity and the second acceleration;

[0061] The vibration exciter 3 is further used to update the current vibration amplitude when the first acceleration is different from the preset acceleration, and re-apply vibration to the smart cable 4 according to the vibration signal and the updated vibration amplitude.

[0062] Specifically, the smart cable 4 is straightened and placed horizontally on multiple vibrators 3, each vibrator 3 corresponds to a measurement point and a six-axis Bluetooth sensor 5, and each vibrator 3 is connected to the same signal generator 1, so as to ensure that all vibrators 3 can simultaneously apply vibration to the smart cable 4 according to a unified vibration signal and a unified vibration amplitude.

[0063] Specifically, before performing vibration response calibration, some vibration excitations corresponding to vibration frequencies are applied to the smart cable 4 based on experience to determine the frequency range in which the preset vibration frequency of the smart cable 4 is located.

[0064] In a preferred embodiment, the demodulator 2 is a weak grating demodulator.

[0065] Specifically, since there is a weak grating array inside the smart cable 4, a weak grating demodulator is used to measure its acceleration.

[0066] In another preferred embodiment, the determination of the preset distance includes:

[0067] Obtaining the weak grating spacing of the smart cable 4;

[0068] The weak grating spacing is used as the preset spacing.

[0069] Specifically, since the minimum spacing of the weak grating array inside the smart cable 4 is 0.1m, in order to ensure that each weak grating array can vibrate at the same time when vibration is applied, the spacing of each measuring point is also determined according to the weak grating spacing. Therefore, for the exciter 3 and the six-axis Bluetooth sensor 5 corresponding to the measuring point: the minimum distance between two adjacent exciters 3 is 0.1m; at the same time, since the smart cable 4 is a multi-core structure of aluminum-clad steel wire, the cross-sectional area can reach 280mm 2 , and the distance between two adjacent exciters 3 should not exceed 2m, so the final spacing between adjacent exciters 3 and adjacent six-axis Bluetooth sensors 5 is set according to the weak grating spacing.

[0070] In this preferred embodiment, the distance between adjacent six-axis Bluetooth sensors 5 is determined according to the weak grating distance.

[0071] In another preferred embodiment, the six-axis Bluetooth sensor 5 is installed on each measuring point of the smart cable 4 by bonding.

[0072] Specifically, all six-axis Bluetooth sensors 5 are linearly installed on the intelligent cable 4. Schematically, the linear installation diagram of the six-axis Bluetooth sensor 5 is as follows: Figure 2 As shown, it is directly bonded to the smart cable 4 by hard glue, and the six-axis Bluetooth sensor 5 remains in a horizontal state.

[0073] Preferably, the six-axis Bluetooth sensor 5 is mounted on the smart cable 4 by bonding. Since the bonding method can evenly distribute the stress of the connection part, the mechanical stress concentration caused by vibration, impact or temperature change can be reduced, thereby improving the reliability of the connection. Using hard glue for bonding, a seal can be formed between the sensor and the cable to enhance the waterproof and dustproof performance. In addition, since the bonding installation is relatively simple and does not require complex mechanical connections or additional tools, the installation efficiency can be improved, saving time and labor costs. At the same time, compared with mechanical connection methods such as screws and clamps, bonding will not produce additional holes or structural changes to the connected smart cable 4, maintaining the integrity of the cable. Many existing adhesives have good electrical insulation properties, which can avoid the risk of electrical short circuits or other electrical failures and ensure the normal operation of the sensor.

[0074] In this preferred embodiment, the six-axis Bluetooth sensor 5 is mounted on the smart cable 4 by bonding.

[0075] In another preferred embodiment, the vibration response calibration of the smart cable 4 according to the angular velocity and the second acceleration includes:

[0076] Performing Fourier transform on the second acceleration to obtain the vibration response frequency of each measuring point of the smart cable 4;

[0077] Using the second acceleration as the vibration response amplitude of each measuring point of the smart cable 4;

[0078] The vibration response of the smart cable 4 is calibrated according to the vibration response frequency, the vibration response amplitude and the angular velocity.

[0079] Schematically, the acceleration measured by a single six-axis Bluetooth sensor 5 is as follows: Figure 3 As shown. The six-axis Bluetooth sensor 5 can measure acceleration in the three axes of X, Y and Z. During calibration, the three sensitive axes inside the six-axis Bluetooth sensor 5 are made parallel to the three motion axes of the measured signal, so that the three-axis vibration information of the measured signal can be accurately obtained. Among them, the three-axis directions X, Y, and Z respectively represent the three coordinate axis directions of the orthogonal Cartesian coordinate system. Generally, X and Y indicate that when the sensor is installed on the measured object, the directions of the sensitive axes are along the two horizontal axes, and Z represents the vertical axis.

[0080] Specifically, the vibration amplitude a applied by the exciter 3 can be expressed as a three-dimensional space vector:

[0081] a=(a x ,a y ,a z ) T

[0082] In the formula, a x Indicates the vibration amplitude in the X-axis direction, a y Indicates the vibration amplitude in the Y-axis direction, a z Indicates the vibration amplitude in the Z-axis direction.

[0083] Specifically, according to the above formula, the output signals of the six-axis Bluetooth sensor 5 along the three sensitive axes of X, Y and Z are:

[0084] u=(u x ,u y ,u z ) T =S·a

[0085] Where, u represents the output signal of the entire six-axis Bluetooth sensor 5, u x Indicates the output signal of the six-axis Bluetooth sensor 5 in the X-axis direction, u y Indicates the output signal of the six-axis Bluetooth sensor 5 in the Y-axis direction, u z represents the output signal of the six-axis Bluetooth sensor 5 in the Z-axis direction, and S represents the sensitivity of the six-axis Bluetooth sensor 5.

[0086] Specifically, the second acceleration in the time domain is converted into a frequency domain representation through Fourier transform, and then the vibration response frequency of each measurement point is obtained.

[0087] Specifically, the aerial posture of the measurement point can be determined according to the angular velocity of each measurement point. Figure 4 shown.

[0088] In this preferred embodiment, the vibration response calibration of the smart cable 4 is achieved through the angular velocity and the second acceleration.

[0089] In another preferred embodiment, the host computer is further used for:

[0090] According to the vibration response frequency and the preset vibration frequency, the vibration distortion of each measuring point of the smart cable 4 is calculated;

[0091] According to the vibration distortion, a distortion calibration result of the smart cable 4 is obtained.

[0092] Preferably, since distortion refers to the degree to which a signal changes during transmission, including amplitude distortion, phase distortion, etc. It reflects the difference between the signal and the original signal. Therefore, in vibration analysis, distortion can show the accuracy and integrity of signal transmission of the smart cable 4 when it is subjected to external vibration or impact. Therefore, by calculating the distortion of the smart cable 4, it is helpful to identify the dynamic characteristics of the smart cable 4, including its frequency response, resonance phenomenon and attenuation characteristics. These characteristics directly affect the vibration response ability of the cable at different frequencies. At the same time, through distortion analysis, the performance of the materials and structural design used in the smart cable 4 can be evaluated. For example, some materials may show greater distortion under high-frequency vibration, which may indicate that the material selection or structural design needs to be optimized. Distortion analysis can reveal the impact of environmental factors (such as temperature, humidity, pressure, etc.) on cable performance, help understand the vibration response performance in practical applications, and then make adjustments or improvements.

[0093] In this preferred embodiment, the vibration distortion of each measuring point of the smart cable 4 is calculated through the vibration response frequency and the preset vibration frequency.

[0094] In another preferred embodiment, the host computer is further used for:

[0095] The vibration restoration degree of each measuring point of the smart cable 4 is calculated according to the vibration response amplitude and the vibration amplitude corresponding to the vibration response amplitude;

[0096] According to the vibration restoration degree, a restoration degree calibration result of the smart cable 4 is obtained.

[0097] Preferably, the degree of restoration generally refers to the ability of the measurement system to restore or reproduce the input signal under certain conditions. It reflects the degree of agreement between the measurement result and the real signal. Therefore, in the vibration response analysis, a higher degree of restoration means that the smart cable 4 can accurately capture and transmit the vibration signal, thereby more truly reflecting its dynamic performance. Therefore, through the analysis of the degree of restoration of the sensors in the smart cable 4 at different positions, specific information about the vibration characteristics of the smart cable 4 at different frequencies and amplitudes can be provided. This helps to understand the response behavior of the cable under different working conditions, including resonant frequency, attenuation characteristics, etc. Then, the optimal measurement point layout and cable design can be determined to improve the capture effect of the vibration signal. This helps to make reasonable configuration in the design stage and improve the overall performance of the smart cable 4.

[0098] In this preferred embodiment, the vibration restoration degree of each measuring point of the smart cable 4 is calculated based on the vibration response amplitude and the vibration amplitude corresponding to the vibration response amplitude.

[0099] In another preferred embodiment, the host computer is further used for:

[0100] Obtaining a third acceleration measured by the six-axis Bluetooth sensor 5 at different preset frequencies that is the same as the preset acceleration, and a fourth acceleration of the optical fiber vibration at each measuring point when the smart cable 4 is under the third acceleration;

[0101] Obtaining a first frequency response curve according to the different preset frequencies and the third acceleration;

[0102] Obtaining a second frequency response curve according to the different preset frequencies and the fourth acceleration;

[0103] Extracting a first frequency range when the first frequency response curve and the second frequency response curve are in a linear relationship, and a second frequency range when the first frequency response curve and the second frequency response curve are in a nonlinear relationship;

[0104] According to the first frequency range and the second frequency range, a frequency response range index of the smart cable 4 is obtained.

[0105] Specifically, vibrations at different preset frequencies, such as 1 Hz, 3 Hz, 5 Hz, 10 Hz and 60 Hz, are simultaneously applied to each measuring point of the smart cable 4 by the exciter 3. For each vibration, the vibration amplitude needs to be changed by adjusting the exciter 3 until the acceleration on the six-axis Bluetooth sensor 5 is the same as the preset acceleration. Then the host computer obtains the third acceleration measured by the six-axis Bluetooth sensor 5 when it is the same as the preset acceleration, and the fourth acceleration of the optical fiber vibration at each measuring point when the smart cable 4 is under the third acceleration.

[0106] Specifically, each third acceleration corresponds to a preset frequency. Therefore, a first frequency response curve is drawn according to the third acceleration and each different preset frequency. The x-axis of the first frequency response curve is each different preset frequency, and the y-axis is the third acceleration corresponding to each different preset frequency.

[0107] Specifically, each fourth acceleration also corresponds to a preset frequency. Therefore, a second frequency response curve is drawn according to the fourth acceleration and each different preset frequency. The x-axis of the second frequency response curve is each different preset frequency, and the y-axis is the fourth acceleration corresponding to each different preset frequency.

[0108] Specifically, by analyzing the first frequency response curve and the second frequency response curve, it can be seen that within a certain frequency range, the first frequency response curve and the second frequency response curve are in a linear relationship, while within another frequency range, the first frequency response curve and the second frequency response curve are not in a linear relationship. Therefore, it can be known that within the frequency range where the first frequency response curve and the second frequency response curve are in a linear relationship, the vibration response performance of the smart cable 4 is good, and within the frequency range where the first frequency response curve and the second frequency response curve are not in a linear relationship, the vibration response performance of the smart cable 4 is poor. Then the frequency response range index of the smart cable 4 can be obtained.

[0109] Preferably, the obtained frequency response range index can help evaluate the dynamic performance of the smart cable 4 at different frequencies and understand its response ability to vibration in practical applications. This is crucial for determining whether the cable can meet the needs of a specific application. By analyzing the frequency response range, designers can identify the optimal operating frequency of the cable, thereby performing corresponding design optimization to improve the performance and reliability of the cable. In addition, in different application environments, the smart cable 4 may face different vibration conditions. The frequency response range index can help users select cables suitable for specific environments and ensure that they perform well in actual use.

[0110] In this preferred embodiment, by obtaining the third acceleration measured by the six-axis Bluetooth sensor 5 at different preset frequencies and the same as the preset acceleration, and the fourth acceleration of the optical fiber vibration at each measuring point when the smart cable 4 is under the third acceleration, a first frequency response curve is obtained according to different preset frequencies and the third acceleration, and a second frequency response curve is obtained according to different preset frequencies and the fourth acceleration. Finally, the frequency response range indicator of the above-mentioned smart cable 4 is obtained according to the first frequency response curve and the second frequency response curve.

[0111] In another preferred embodiment, the host computer is further used for:

[0112] Obtaining a vibration amplitude corresponding to the second acceleration;

[0113] Calculating the response sensitivity of each measuring point according to the vibration amplitude and the second acceleration;

[0114] According to the response sensitivity, the response sensitivity of the smart cable 4 is obtained.

[0115] Specifically, after obtaining the second acceleration measured by the demodulator 2, the host computer obtains the vibration amplitude corresponding to the second acceleration, and then calculates the response sensitivity of each measuring point of the above-mentioned smart cable 4 according to the quotient of the second acceleration and the vibration amplitude.

[0116] Preferably, response sensitivity refers to the degree of reaction of the system to external excitation (such as vibration, pressure, etc.), which is usually expressed as the ratio of the output signal change to the input signal change. Therefore, in the vibration analysis of the smart cable 4, the sensitivity reflects the ability of each measuring point to capture the vibration signal, and can reveal the response characteristics of the cable under different conditions. Therefore, by measuring the response sensitivity of each measuring point on the smart cable 4, the dynamic characteristics of the smart cable 4 at different frequencies and amplitudes can be clearly understood. This helps to identify the resonant frequency, attenuation characteristics and other key performance indicators.

[0117] In this preferred embodiment, the response sensitivity of each measuring point of the smart cable 4 is calculated through the second acceleration and the vibration amplitude corresponding to the second acceleration.

[0118] In another preferred embodiment, the host computer is further used for:

[0119] Acquire the mass of the smart cable 4 and the cross-sectional area of ​​the smart cable 4 within a preset period of time;

[0120] According to the second acceleration and the mass, a dynamic load of each measuring point of the smart cable 4 is calculated;

[0121] Calculating the stress at each measuring point according to the dynamic load and the cross-sectional area;

[0122] According to the stress and the preset SN curve, the fatigue life of the smart cable 4 is obtained.

[0123] Specifically, the dynamic load of each measuring point of the smart cable 4 under the vibration applied by the exciter 3 is calculated according to the product of the mass of the smart cable 4 and the second acceleration. Then, the stress of each measuring point of the smart cable 4 under the vibration applied by the exciter 3 is calculated according to the quotient of the dynamic load and the cross-sectional area of ​​the smart cable 4. Then, the fatigue life of the smart cable 4 can be obtained according to the SN curve and the stress.

[0124] In this preferred embodiment, the fatigue life of the smart cable 4 is calculated based on the second acceleration of each measuring point of the smart cable 4 , the mass of the smart cable 4 , and the cross-sectional area of ​​the smart cable 4 .

[0125] Preferably, among the measuring points of the smart cable 4, one measuring point is selected as the target measuring point. On this target measuring point, three six-axis Bluetooth sensors 5 are installed around at a spacing of 120°. Then, the smart cable 4 is straightened and placed on the exciter 3. The exciter 3 is connected to the signal generator 1. Vibration is applied to the smart cable 4 through the exciter 3. By observing the acceleration display values ​​on the three six-axis Bluetooth sensors 5, it can be judged whether the distribution of the weak grating array inside the smart cable 4 is uniform: if the acceleration display values ​​of the three six-axis Bluetooth sensors 5 are the same, it means that the weak grating array corresponding to this measuring point is in the center of the smart cable 4, which proves that the quality of the smart cable 4 is good, and therefore the result of the vibration response calibration is more accurate; if the acceleration display values ​​of the three six-axis Bluetooth sensors 5 are different, the larger the difference, the more biased the position of the weak grating array corresponding to this measuring point is, which proves that the quality of the smart cable 4 is poor, and therefore the result of the vibration response calibration is biased and needs some correction.

[0126] Schematically, the ring installation diagram of the six-axis Bluetooth sensor 5 is as follows Figure 5 shown.

[0127] By implementing the above-mentioned embodiments of the present invention, the vibration response of the smart cable 4 can be calibrated.

[0128] The above are preferred embodiments of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications are also regarded as protection of the present invention.

Claims

1. A vibration response calibration device for a smart cable, characterized in that: include: Signal generator, vibrator, six-axis Bluetooth sensor, demodulator, and host computer; The signal generator is connected to the vibration exciter, the smart cable to be calibrated is straightened and placed horizontally on the vibration exciter, the six-axis Bluetooth sensor is horizontally installed on each measuring point of the smart cable at a preset interval, and one end of the smart cable is connected to the demodulator; wherein each measuring point corresponds to a vibration exciter and a six-axis Bluetooth sensor respectively; The signal generator is used to generate a vibration signal according to a preset vibration frequency and transmit the vibration signal to the vibration exciter; The vibration exciter is used to apply vibration to the smart cable according to the vibration signal and the current vibration amplitude after receiving the vibration signal, so as to make the smart cable vibrate; The six-axis Bluetooth sensor is used to measure the first acceleration of the smart cable when it vibrates, and when the measured first acceleration is the same as the preset acceleration, measure the angular velocity of each measuring point, and transmit the angular velocity to the host computer; The demodulator is used to measure the second acceleration of the optical fiber vibration at each measuring point when the first acceleration is the same as the preset acceleration, and transmit the second acceleration to the host computer; The host computer is used to calibrate the vibration response of the smart cable according to the angular velocity and the second acceleration; The vibration exciter is further used to update the current vibration amplitude when the first acceleration is different from the preset acceleration, and re-apply vibration to the smart cable according to the vibration signal and the updated vibration amplitude.

2. The vibration response calibration device of a smart cable according to claim 1, characterized in that: The step of calibrating the vibration response of the smart cable according to the angular velocity and the second acceleration includes: Performing Fourier transform on the second acceleration to obtain the vibration response frequency of each measuring point of the smart cable; Using the second acceleration as the vibration response amplitude of each measuring point of the smart cable; The vibration response of the smart cable is calibrated according to the vibration response frequency, the vibration response amplitude and the angular velocity.

3. The vibration response calibration device of a smart cable according to claim 2, characterized in that: The host computer is also used for: According to the vibration response frequency and the preset vibration frequency, the vibration distortion degree of each measuring point of the smart cable is calculated; A distortion calibration result of the smart cable is obtained according to the vibration distortion.

4. The vibration response calibration device of a smart cable according to claim 3, characterized in that: The host computer is also used for: The vibration restoration degree of each measuring point of the smart cable is calculated according to the vibration response amplitude and the vibration amplitude corresponding to the vibration response amplitude; According to the vibration restoration degree, a restoration degree calibration result of the smart cable is obtained.

5. The vibration response calibration device of a smart cable according to claim 4, characterized in that: The host computer is also used for: Obtaining a third acceleration measured by the six-axis Bluetooth sensor at different preset frequencies that is the same as the preset acceleration, and a fourth acceleration of the optical fiber vibration at each measuring point when the smart cable is under the third acceleration; Obtaining a first frequency response curve according to the different preset frequencies and the third acceleration; Obtaining a second frequency response curve according to the different preset frequencies and the fourth acceleration; Extracting a first frequency range when the first frequency response curve and the second frequency response curve are in a linear relationship, and a second frequency range when the first frequency response curve and the second frequency response curve are in a nonlinear relationship; A frequency response range index of the smart cable is obtained according to the first frequency range and the second frequency range.

6. The vibration response calibration device of a smart cable according to claim 5, characterized in that: The host computer is also used for: Obtaining a vibration amplitude corresponding to the second acceleration; Calculating the response sensitivity of each measuring point according to the vibration amplitude and the second acceleration; According to the response sensitivity, the response sensitivity of the smart cable is obtained.

7. The vibration response calibration device of a smart cable according to claim 6, characterized in that: The host computer is also used for: Acquire the mass of the smart cable and the cross-sectional area of ​​the smart cable within a preset time period; Calculating a dynamic load at each measuring point of the smart cable according to the second acceleration and the mass; Calculating the stress at each measuring point according to the dynamic load and the cross-sectional area; The fatigue life of the smart cable is obtained according to the stress and the preset SN curve.

8. The vibration response calibration device of a smart cable according to claim 7, characterized in that: The demodulator is a weak grating demodulator.

9. The vibration response calibration device of a smart cable according to claim 8, characterized in that: The determination of the preset distance includes: Obtaining the weak grating spacing of the smart cable; The weak grating spacing is used as the preset spacing.

10. The vibration response calibration device of a smart cable according to claim 9, characterized in that: The six-axis Bluetooth sensor is installed on each measuring point of the smart cable by bonding.

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