CN113358245B - Draught fan inhaul cable tension measuring method and system, storage medium and computing equipment - Google Patents
Draught fan inhaul cable tension measuring method and system, storage medium and computing equipment Download PDFInfo
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- CN113358245B CN113358245B CN202110460149.8A CN202110460149A CN113358245B CN 113358245 B CN113358245 B CN 113358245B CN 202110460149 A CN202110460149 A CN 202110460149A CN 113358245 B CN113358245 B CN 113358245B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/10—Measuring force or stress, in general by measuring variations of frequency of stressed vibrating elements, e.g. of stressed strings
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
Abstract
The invention discloses a method, a system, a storage medium and a computing device for measuring the draught fan draught cable tension, wherein the method is based on the principle of string vibration as the draught cable force measurement, the draught cable to be measured is regarded as a string, an acceleration sensor is respectively arranged at two ends of the draught cable to be measured, an acceleration collector is arranged at a preset position of a draught fan, the acceleration collector is in signal connection with the two acceleration sensors, the natural vibration frequency of the draught cable to be measured is measured through the acceleration sensors and the acceleration collector, the tension of the draught cable to be measured is calculated according to a fundamental frequency expression formula of the string vibration, and finally the tension is subjected to gravity influence correction to obtain the final draught cable tension. The invention does not need to additionally customize a inhaul cable tool and maintain the original structure of the inhaul cable, has simple operation and good universality and greatly reduces the cost.
Description
Technical Field
The invention relates to the technical field of safety monitoring of floating type draught fan guys, in particular to a draught fan guy tension measuring method, a system, a storage medium and computing equipment.
Background
With the rapid development of offshore wind power, offshore wind turbines are continuously moving from offshore and shallow sea to open sea and deep sea. According to research, after the water depth reaches 60m, the floating offshore wind turbine has better economy than a fixed offshore wind turbine and is more feasible in deep sea, so that the application range of offshore wind power is greatly expanded by the floating offshore wind turbine. The floating type fan is in a fire and heat research stage, a floating type wind power plant is firstly built in Europe and is operated in a grid-connected mode. In view of the current situation, the floating type fan structure has diversity, and the diversity is not only embodied on the basis of the floating type fan, but also embodied on the structure of the fan body. The structural difference of the body of the fan is mainly reflected in the number of the wind wheels, and besides a common single-wind-wheel fan, the floating fan with a double-wind-wheel structure also receives wide attention, and is considered to be an innovative feasible scheme in the industry. However, no matter single wind wheel or double wind wheels are adopted, the floating type fan body is structurally provided with the guy cable, and for the floating type fan with the guy cable, the stress of the guy cable is an important index of the unit state. The characteristic of difficult maintenance of the offshore wind turbine puts higher requirements on state monitoring, and the operation state of the offshore wind turbine needs to be comprehensively and accurately grasped. The guy cable force measurement of the floating fan is an important component for monitoring the state of the floating fan with a guy cable structure.
The existing method for measuring the tensile force is generally based on a strain gauge, namely a standard object is packaged in equipment, the strain gauge is pasted on the object, the equipment measures the elongation of the standard object through the strain gauge when being tensioned, and therefore the stress magnitude is indicated through a preset calibration relation. The method is adopted to measure the force of the guy cable of the floating fan, the equipment is required to be installed in the middle of the guy cable, namely the structure of the guy cable is required to be adjusted, if the guy cable is cut into two sections, the original structure of the guy cable is changed to a certain extent, the integrity of the guy cable is damaged, meanwhile, special tools are required to be customized for different guy cables, the tool is poor in universality and complex in installation, and monitoring of the guy cable force on the floating fan is not facilitated.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a draught fan inhaul cable tension measuring method, which measures the inhaul cable tension based on the string vibration principle, is simple in operation method, does not need to additionally customize an inhaul cable tool and maintain the original structure of the inhaul cable, is good in universality and greatly reduces the cost.
The invention also provides a system for measuring the tension of the draught fan inhaul cable.
A third object of the present invention is to provide a storage medium.
It is a fourth object of the invention to provide a computing device.
The first purpose of the invention is realized by the following technical scheme: a draught fan guy cable tension measuring method is characterized in that a string vibration principle is used as a basis for guy cable force measurement, a guy cable to be measured is taken as a string, an acceleration sensor is respectively installed at two ends of the guy cable to be measured, an acceleration collector is installed at a preset position of a draught fan, the acceleration collector is in signal connection with the two acceleration sensors, acceleration response of the guy cable to be measured is sensed through the acceleration sensors and is output in a signal form, the acceleration collector collects signals, vibration inherent frequency of the guy cable to be measured is calculated according to signal data, tension of the guy cable to be measured is calculated according to a fundamental frequency expression formula of string vibration, and finally gravity influence is carried out on the tension to correct the tension to obtain final guy cable tension.
Further, the method comprises the following steps:
1) Signal acquisition: the acceleration response of the tested cable in two orthogonal directions is sensed through two acceleration sensors on the tested cable and is output in the form of signals, and then the signals output by the two acceleration sensors are collected through an acceleration collector and are stored as a data file at intervals;
2) Signal filtering: extracting the data files stored in the step 1), performing band-stop filtering on the data of each data file, and filtering out frequency components which have adverse effects on signals in the data, wherein the frequency components include noise, current interference, unit shaking and unit frequency;
3) And (3) calculating a frequency spectrum: calculating the frequency spectrum or power spectral density of the acceleration signal for each filtered data file;
4) Extracting frequency: extracting frequency values corresponding to the highest peak of the frequency curve in each data file according to the frequency spectrums or the power spectral densities of all the data files calculated in the step 4), forming all the extracted frequency values into a frequency value set, and extracting the aggregation center of the frequency value set to serve as the vibration inherent frequency f of the stay cable to be tested;
5) Calculating the tension of the stay cable to be tested:
when the string vibrates, the fundamental frequency of the string is expressed by the following formula:
in the formula, L represents the effective length of the string, namely the effective length of the stay cable to be measured; t represents the pulling force on the string, namely the pulling force on the stay cable to be tested; rho represents the linear density of the string, namely the linear density of the stay cable to be measured;
the calculation formula for deducing the tension T according to the fundamental frequency expression formula when the string vibrates is as follows:
T＝(2Lf) 2 *ρ
substituting the natural vibration frequency f extracted in the step 4) into a calculation formula of the tension T to further obtain the tension T of the stay cable to be tested;
6) Gravity influence correction: correcting the tension according to the form and the dead weight of the stay cable to be detected, and assuming that the included angle between the stay cable to be detected and the horizontal plane is theta and the gravity thereof is G, correcting the tension T of the stay cable through the gravity Correction Namely the final inhaul cable tension:
T correction ＝T-G*sinθ。
Further, the acceleration sensor is fixed on the tested stay cable through a tool clamp, the tool clamp is integrally of a cylindrical structure and is composed of two half structures which are symmetrical relative to the axis of the tool clamp, the two half structures are clamped on the tested stay cable and connected through bolts, and the peripheral surface of one half structure is provided with an acceleration sensor mounting position in a processing mode.
The second purpose of the invention is realized by the following technical scheme: a draught fan inhaul cable tension measuring system comprises a signal collecting module, a signal filtering module, a frequency spectrum calculating module, a frequency extracting module, a tension calculating module and a gravity influence correcting module;
the signal acquisition module is used for acquiring acceleration data of the stay cable to be detected in two orthogonal directions and storing the acceleration data as a data file at intervals;
the signal filtering module is used for carrying out band-stop filtering on data of the data file and filtering out frequency components which have adverse effects on signals in the data, wherein the frequency components include noise, current interference, unit shaking and unit frequency;
the frequency spectrum calculating module is used for calculating the frequency spectrum or the power spectrum density of the acceleration signal aiming at the filtered data file;
the frequency extraction module extracts a frequency value corresponding to the highest peak of a frequency curve in each data file according to the frequency spectrums or the power spectral densities of all the data files calculated by the frequency spectrum calculation module, all the extracted frequency values form a frequency value set, and an aggregation center of the frequency value set is extracted and used as the vibration inherent frequency f of the stay cable to be detected;
the tension calculation module calculates the tension T of the stay cable to be tested according to a fundamental frequency expression formula of string vibration by combining the known effective length, the linear density and the vibration natural frequency f of the stay cable to be tested, which is obtained by the frequency extraction module;
the gravity influence correction module is used for performing gravity correction on the pull cable tension calculated by the tension calculation module, and the pull cable tension T after the gravity correction Correction I.e. the final cable tension.
Furthermore, the signal acquisition module adopts two acceleration sensors and an acceleration collector, the two acceleration sensors are respectively arranged at two ends of the stay cable to be detected, and the acceleration collector is arranged at a preset position of the fan and is in signal connection with the two acceleration sensors; the acceleration response of the tested inhaul cable in two orthogonal directions is sensed through the two acceleration sensors on the tested inhaul cable and is output in a signal form, and then signals output by the two acceleration sensors are collected through the acceleration collector and are stored as a data file at intervals.
Further, the acceleration sensor is fixed on the tested stay cable through a tool clamp, the tool clamp is integrally of a cylindrical structure and is composed of two half structures which are symmetrical relative to the axis of the tool clamp, the two half structures are clamped on the tested stay cable and connected through bolts, and the peripheral surface of one half structure is provided with an acceleration sensor mounting position in a processing mode.
Further, the tension calculation module performs the following operations:
when the string vibrates, the fundamental frequency of the string is expressed by the following formula:
in the formula, L represents the effective length of the string, namely the effective length of the stay cable to be measured; t represents the pulling force applied to the string, namely the pulling force applied to the stay cable to be tested; rho represents the linear density of the string, namely the linear density of the stay cable to be measured;
the calculation formula for deducing the tension T according to the fundamental frequency expression formula when the string vibrates is as follows:
T＝(2Lf) 2 *ρ
substituting the natural vibration frequency f extracted by the frequency extraction module into a calculation formula of the tension T so as to obtain the tension T of the stay cable to be tested.
Further, the gravity influence correction module performs the following operations:
correcting the tension according to the form and the dead weight of the stay cable to be detected, and if the included angle between the stay cable to be detected and the horizontal plane is theta and the gravity thereof is G, correcting the tension T of the stay cable through the gravity Correction That is to say the final tension of the cable,
T correction ＝T-G*sinθ。
The third purpose of the invention is realized by the following technical scheme: a storage medium storing a program which, when executed by a processor, implements the fan cable tension measuring method of any one of claims 1 to 3.
The fourth purpose of the invention is realized by the following technical scheme: a computing device comprising a processor and a memory for storing processor executable programs, the processor implementing the method of measuring wind turbine generator cable tension of any of claims 1 to 3 when executing the programs stored in the memory.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. the invention takes the string vibration principle as the basis, the stay cable to be measured is regarded as a string, the natural vibration frequency of the stay cable to be measured is measured by the acceleration sensor and the acceleration collector, and then the pulling force of the stay cable to be measured is obtained by adopting the fundamental frequency expression formula of string vibration.
2. The invention has simple installation and low precision requirement, does not need to additionally customize a guy cable tool, maintains the original structure of the guy cable, is suitable for testing the large scale of the guy cable quantity, greatly reduces the cost and provides powerful support for the state monitoring of the floating type fan.
Drawings
Fig. 1 is a schematic structural view of a tooling fixture used in the present invention.
Detailed Description
The present invention will be described in further detail with reference to examples and drawings, but the present invention is not limited thereto.
Example 1
The embodiment discloses a method for measuring the pull force of a draught fan stay cable, which is based on the principle of string vibration as the force measurement of the stay cable, the stay cable to be measured is taken as a string, an acceleration sensor is respectively arranged at two ends of the stay cable to be measured, an acceleration collector is arranged at a preset position of a draught fan, the acceleration collector is connected with the two acceleration sensors in a signal mode, the acceleration sensor senses the acceleration response of the stay cable to be measured and outputs the acceleration response in a signal mode, the acceleration collector collects signals, the vibration inherent frequency of the stay cable to be measured is calculated according to signal data, the pull force of the stay cable to be measured is calculated according to a fundamental frequency expression formula of string vibration, and finally the pull force is subjected to gravity influence correction to obtain the final pull force of the stay cable. Which comprises the following steps:
1) Signal acquisition: the acceleration response of the tested cable in two orthogonal directions is sensed through two acceleration sensors on the tested cable and is output in the form of signals, and then the signals output by the two acceleration sensors are collected through an acceleration collector and are stored as a data file at intervals;
2) Signal filtering: extracting the data files stored in the step 1), performing band-stop filtering on the data of each data file, and filtering out frequency components which have adverse effects on signals in the data, wherein the frequency components include noise, current interference, unit shaking and unit frequency;
3) And (3) calculating a frequency spectrum: calculating the frequency spectrum or power spectral density of the acceleration signal for each filtered data file;
4) Extraction frequency: extracting frequency values corresponding to the highest peak of the frequency curve in each data file according to the frequency spectrums or the power spectral densities of all the data files calculated in the step 4), forming all the extracted frequency values into a frequency value set, and extracting an aggregation center of the frequency value set to serve as the vibration inherent frequency f of the stay cable to be tested;
5) And (3) calculating the tension of the stay cable to be tested:
when the string vibrates, the fundamental frequency of the string is expressed by the following formula:
in the formula, L represents the effective length of the string, namely the effective length of the stay cable to be measured; t represents the pulling force on the string, namely the pulling force on the stay cable to be tested; rho represents the linear density of the string, namely the linear density of the stay cable to be measured;
the calculation formula for deducing the tension T according to the fundamental frequency expression formula when the string vibrates is as follows:
T＝(2Lf) 2 *ρ
substituting the natural vibration frequency f extracted in the step 4) into a calculation formula of the tension T to further obtain the tension T of the stay cable to be tested;
6) And (3) gravity influence correction: correcting the tension according to the form and the dead weight of the stay cable to be detected, and assuming that the included angle between the stay cable to be detected and the horizontal plane is theta and the gravity thereof is G, correcting the tension T of the stay cable through the gravity Correction Namely the final inhaul cable tension:
T correction ＝T-G*sinθ。
As shown in fig. 1, the acceleration sensor 1 is fixed on a tested cable 4 through a tooling clamp 2, the tooling clamp 2 is integrally in a cylindrical structure and is composed of two half structures which are symmetrical relative to the axis of the tooling clamp, the two half structures are clamped on the tested cable 4 and connected through a bolt 3, and the peripheral surface of one half structure is provided with an acceleration sensor mounting position.
Example 2
The embodiment discloses a virtual inertia control system of a wind turbine generator, which comprises a signal acquisition module, a signal filtering module, a frequency spectrum calculation module, a frequency extraction module, a tension calculation module and a gravity influence correction module;
the signal acquisition module adopts two acceleration sensors and an acceleration collector, the two acceleration sensors are respectively arranged at two ends of the stay cable to be detected, and the acceleration collector is arranged at a preset position of the fan and is in signal connection with the two acceleration sensors; the acceleration response of the tested cable in two orthogonal directions is sensed by the two acceleration sensors on the tested cable and is output in the form of signals, and then the signals output by the two acceleration sensors are collected by the acceleration collector and are stored as a data file at intervals. The acceleration sensor is fixed on the tested stay cable through the tool clamp, the tool clamp is integrally of a cylindrical structure and is composed of two half structures which are symmetrical relative to the axis of the tool clamp, the two half structures are clamped on the tested stay cable and connected through bolts, and the peripheral surface of one half structure is provided with an acceleration sensor mounting position in a processing mode.
The signal filtering module is used for carrying out band-stop filtering on data of the data file and filtering out frequency components which have adverse effects on signals in the data, wherein the frequency components include noise, current interference, unit shaking and unit frequency;
the frequency spectrum calculating module is used for calculating the frequency spectrum or power spectrum density of the acceleration signal aiming at the filtered data file;
the frequency extraction module extracts a frequency value corresponding to the highest peak of a frequency curve in each data file according to the frequency spectrum or power spectrum density of all the data files calculated by the frequency spectrum calculation module, all the extracted frequency values form a frequency value set, and the aggregation center of the frequency value set is extracted to be used as the vibration inherent frequency f of the stay cable to be tested;
the tension calculation module calculates the tension T of the stay cable to be tested according to a fundamental frequency expression formula of string vibration by combining the known effective length, the linear density and the vibration natural frequency f of the stay cable to be tested, which is obtained by the frequency extraction module; it performs the following operations:
when the string vibrates, the fundamental frequency of the string is expressed by the following formula:
in the formula, L represents the effective length of the string, namely the effective length of the stay cable to be measured; t represents the pulling force on the string, namely the pulling force on the stay cable to be tested; rho represents the linear density of the string, namely the linear density of the stay cable to be measured;
the calculation formula for deducing the tension T according to the fundamental frequency expression formula when the string vibrates is as follows:
T＝(2Lf) 2 *ρ
substituting the natural vibration frequency f extracted by the frequency extraction module into a calculation formula of the tension T to further obtain the tension T of the stay cable to be tested;
the gravity influence correction module is used for performing gravity correction on the pull cable tension calculated by the tension calculation module, and the pull cable tension T after the gravity correction Correction The final inhaul cable tension is obtained; it performs the following operations:
correcting the tension according to the form and the dead weight of the stay cable to be detected, and assuming that the included angle between the stay cable to be detected and the horizontal plane is theta and the gravity thereof is G, correcting the tension T of the stay cable through the gravity Correction I.e. the final pull of the cable, T Correction ＝T-G*sinθ。
Example 3
The embodiment discloses a storage medium, which stores a program, and when the program is executed by a processor, the method for measuring the tension of a fan guy cable described in embodiment 1 is implemented.
The storage medium in this embodiment may be a magnetic disk, an optical disk, a computer Memory, a Read-Only Memory (ROM), a Random Access Memory (RAM), a usb disk, a removable hard disk, or other media.
Example 4
The embodiment discloses a computing device, which comprises a processor and a memory, wherein the memory is used for storing an executable program of the processor, and when the processor executes the program stored in the memory, the method for measuring the draught fan guy cable tension is realized in the embodiment 1.
The computing device in this embodiment may be a desktop computer, a notebook computer, a smart phone, a PDA handheld terminal, a tablet computer, a Programmable Logic Controller (PLC), or other terminal devices with a processor function.
The above-mentioned embodiments are merely preferred embodiments of the present invention, and the scope of the present invention is not limited thereto, so that variations based on the shape and principle of the present invention should be covered within the scope of the present invention.
Claims (9)
1. A method for measuring the draught fan inhaul cable tension is characterized by comprising the following steps: the method is based on a string vibration principle as the force measurement of the stay cable, the stay cable to be measured is regarded as a string, an acceleration sensor is respectively arranged at two ends of the stay cable to be measured, an acceleration collector is arranged at a preset position of a fan, the acceleration collector is in signal connection with the two acceleration sensors, the acceleration sensor is used for sensing the acceleration response of the stay cable to be measured and outputting the acceleration response in a signal form, the acceleration collector is used for collecting signals, the vibration natural frequency of the stay cable to be measured is calculated according to signal data, the tension of the stay cable to be measured is calculated according to a fundamental frequency expression formula of string vibration, and finally the tension is subjected to gravity influence correction to obtain the final tension of the stay cable; the method comprises the following steps:
1) Signal acquisition: the acceleration response of the tested cable in two orthogonal directions is sensed through two acceleration sensors on the tested cable and is output in the form of signals, and then the signals output by the two acceleration sensors are collected through an acceleration collector and are stored as a data file at intervals;
2) Signal filtering: extracting the data files stored in the step 1), performing band-stop filtering on the data of each data file, and filtering out frequency components which have adverse effects on signals in the data, wherein the frequency components include noise, current interference, unit shaking and unit frequency;
3) And (3) calculating a frequency spectrum: calculating the frequency spectrum or power spectral density of the acceleration signal for each filtered data file;
4) Extraction frequency: extracting frequency values corresponding to the highest peak of the frequency curve in each data file according to the frequency spectrums or the power spectral densities of all the data files calculated in the step 4), forming all the extracted frequency values into a frequency value set, and extracting the aggregation center of the frequency value set to serve as the vibration inherent frequency f of the stay cable to be tested;
5) Calculating the tension of the stay cable to be tested:
when the string vibrates, the fundamental frequency of the string is expressed by the following formula:
in the formula, L represents the effective length of the string, namely the effective length of the stay cable to be measured; t represents the pulling force on the string, namely the pulling force on the stay cable to be tested; rho represents the linear density of the string, namely the linear density of the stay cable to be measured;
the calculation formula for deducing the tension T according to the fundamental frequency expression formula when the string vibrates is as follows:
T＝(2Lf) 2 *ρ
substituting the natural vibration frequency f extracted in the step 4) into a calculation formula of the tension T to further obtain the tension T of the stay cable to be tested;
6) Gravity influence correction: correcting the tension according to the form and the dead weight of the stay cable to be detected, and assuming that the included angle between the stay cable to be detected and the horizontal plane is theta and the gravity thereof is G, correcting the tension T of the stay cable through the gravity Correction Namely the final inhaul cable tension:
T correction ＝T-G*sinθ。
2. The method for measuring the pulling force of the draught fan inhaul cable according to claim 1, wherein the method comprises the following steps: the acceleration sensor is fixed on the tested stay cable through the tool clamp, the tool clamp is integrally of a cylindrical structure and is composed of two half structures which are symmetrical relative to the axis of the tool clamp, the two half structures are clamped on the tested stay cable and connected through bolts, and the peripheral surface of one half structure is provided with an acceleration sensor mounting position in a processing mode.
3. The utility model provides a fan cable tension measuring system which characterized in that: the system comprises a signal acquisition module, a signal filtering module, a frequency spectrum calculation module, a frequency extraction module, a tension calculation module and a gravity influence correction module;
the signal acquisition module is used for acquiring acceleration data of the stay cable to be detected in two orthogonal directions and storing the acceleration data as a data file at intervals;
the signal filtering module is used for carrying out band-stop filtering on data of the data file and filtering out frequency components which have adverse effects on signals in the data, wherein the frequency components include noise, current interference, unit shaking and unit frequency;
the frequency spectrum calculating module is used for calculating the frequency spectrum or the power spectrum density of the acceleration signal aiming at the filtered data file;
the frequency extraction module extracts a frequency value corresponding to the highest peak of a frequency curve in each data file according to the frequency spectrum or power spectrum density of all the data files calculated by the frequency spectrum calculation module, all the extracted frequency values form a frequency value set, and the aggregation center of the frequency value set is extracted to be used as the vibration inherent frequency f of the stay cable to be tested;
the tension calculation module is used for calculating the tension T of the stay cable to be tested according to a fundamental frequency expression formula of string vibration by combining the known effective length, the linear density and the vibration natural frequency f of the stay cable to be tested, which is obtained by the frequency extraction module;
the gravity influence correction module is used for performing gravity correction on the pull cable tension calculated by the tension calculation module, and the pull cable tension T after the gravity correction Correction I.e. the final cable tension.
4. The fan guy cable tension measuring system of claim 3, wherein: the signal acquisition module adopts two acceleration sensors and an acceleration collector, the two acceleration sensors are respectively arranged at two ends of the stay cable to be detected, and the acceleration collector is arranged at a preset position of the fan and is in signal connection with the two acceleration sensors; the acceleration response of the tested inhaul cable in two orthogonal directions is sensed through the two acceleration sensors on the tested inhaul cable and is output in a signal form, and then signals output by the two acceleration sensors are collected through the acceleration collector and are stored as a data file at intervals.
5. The fan guy cable tension measuring system of claim 4, wherein: the acceleration sensor is fixed on the tested stay cable through the tool clamp, the tool clamp is integrally of a cylindrical structure and is composed of two half structures which are symmetrical relative to the axis of the tool clamp, the two half structures are clamped on the tested stay cable and connected through bolts, and the peripheral surface of one half structure is provided with an acceleration sensor mounting position in a processing mode.
6. The fan guy cable tension measuring system of claim 3, wherein: the tension calculation module executes the following operations:
when the string vibrates, the fundamental frequency of the string is expressed by the following formula:
in the formula, L represents the effective length of the string, namely the effective length of the stay cable to be measured; t represents the pulling force on the string, namely the pulling force on the stay cable to be tested; rho represents the linear density of the string, namely the linear density of the stay cable to be measured;
the calculation formula for deducing the tension T according to the fundamental frequency expression formula when the string vibrates is as follows:
T＝(2Lf) 2 *ρ
substituting the natural vibration frequency f extracted by the frequency extraction module into a calculation formula of the tension T so as to obtain the tension T of the stay cable to be tested.
7. The fan guy cable tension measuring system of claim 3, wherein: the gravity influence correction module performs the following operations:
correcting the tension according to the form and the dead weight of the stay cable to be detected, and assuming that the included angle between the stay cable to be detected and the horizontal plane is theta and the gravity thereof is G, correcting the tension T of the stay cable through the gravity Correction That is to say the final tension of the cable,
T correction ＝T-G*sinθ。
8. A storage medium storing a program, characterized in that: when the program is executed by a processor, the method for measuring the tension of the draught fan guy cable is realized according to any one of claims 1 to 2.
9. A computing device comprising a processor and a memory for storing processor-executable programs, characterized in that: when the processor executes the program stored in the memory, the method for measuring the draught fan guy cable tension is realized according to any one of claims 1 to 2.
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| KR100343279B1 (en) * | 1999-04-28 | 2002-07-11 | 장승필 | A Measuring Method of Cable Tension Using the Dynamic Characteristics of Cable |
| CN101586997A (en) * | 2009-06-26 | 2009-11-25 | 贵州师范大学 | Method for calculating guy cable vibrating base frequency |
| CN102519651B (en) * | 2011-12-13 | 2013-09-04 | 清华大学 | Method for determining basic frequency of stay cable when testing cable tension of cable stayed bridge by using vibration method |
| CN105784211A (en) * | 2016-03-07 | 2016-07-20 | 湘潭大学 | Method for measuring fundamental frequency and cable force of cable-stayed bridge cable |
| CN107421672B (en) * | 2017-05-17 | 2023-03-31 | 苏交科集团股份有限公司 | Weighted search force calculation method based on global peak searching of vibration frequency |
| CN107202661B (en) * | 2017-07-27 | 2019-10-25 | 哈尔滨开博科技有限公司 | A kind of inhaul cable vibration frequency rank recognition methods based on pseudo- greatest common divisor |
| CN109883596A (en) * | 2019-01-16 | 2019-06-14 | 武汉楚云端信息科技有限责任公司 | A kind of Suo Li automation real-time resolving method based on Spectrum Method |
| CN109827697A (en) * | 2019-03-19 | 2019-05-31 | 东南大学 | Suspension cable time-varying Suo Li recognition methods based on local mean value mode decomposition |
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