CN108710751B - Method and device for identifying local connection looseness of power transmission tower - Google Patents
Method and device for identifying local connection looseness of power transmission tower Download PDFInfo
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Abstract
The invention provides a method and a device for identifying local connection looseness of a power transmission tower, wherein the method comprises the following steps: calculating a flexibility matrix before and after the local loosening of the power transmission tower according to the vibration mode and the inherent frequency of the power transmission tower before and after the local loosening, wherein the flexibility matrix comprises all flexibility coefficients of each measuring point of the power transmission tower; calculating a damage index of each measuring point, wherein the damage index is equal to the maximum flexibility coefficient variable quantity of each measuring point after local loosening is generated and is correspondingly divided by the maximum flexibility coefficient of each measuring point before local loosening is generated; amplifying each damage index, calculating the proportion of each amplified damage index, and determining the measuring point corresponding to the maximum proportion as the local loosening position of the power transmission tower.
Description
Technical Field
The invention relates to the field of power transmission towers, in particular to a method and a device for identifying local connection looseness of a power transmission tower.
Background
The power transmission tower structure is often installed in an angle steel-bolt connection manner. Therefore, during long-term service, structural loosening failures inevitably occur. When a fault damage occurs, the overall vibration characteristics of the structure must change. Therefore, the method accurately identifies the local loosening fault of the power transmission tower structure, and is a key technology for guaranteeing the long-term service safety and reliability of the structure.
In the actual structural health monitoring, the mode shape and the frequency can be directly obtained by the mode test, and due to the spatial distribution characteristic, the method is widely researched in the application field of damage fault positioning. But it is difficult to satisfy the requirements of recognition accuracy and sensitivity in engineering practice only depending on the frequency and the mode shape. Since the structure of the power transmission tower is mainly applied to the environment with complex environment, many key technologies for the health monitoring problem of the structure have many defects from theory to practical application. Therefore, the development of a fault identification method which can be accurate and high in sensitivity becomes a key technology for safe operation of power transmission.
Disclosure of Invention
The embodiment of the invention provides a method and a device for identifying local connection looseness of a power transmission tower, which can be used for monitoring and diagnosing faults of a power transmission tower structure.
According to an aspect of the invention, a transmission tower local connection looseness identification method is provided, and comprises the following steps:
calculating a flexibility matrix of the power transmission tower before and after the local loosening according to the vibration mode and the inherent frequency of the power transmission tower before and after the local loosening, wherein the flexibility matrix comprises all flexibility coefficients of all measuring points of the power transmission tower;
calculating a damage index of each measuring point, wherein the damage index is equal to the maximum flexibility coefficient variation of each measuring point after local loosening is generated and is correspondingly divided by the maximum flexibility coefficient of each measuring point before local loosening is generated;
amplifying each damage index, calculating the proportion of each amplified damage index, and determining the measuring point corresponding to the maximum proportion as the local loosening position of the power transmission tower.
Preferably, the calculating a compliance matrix of the transmission tower before and after the local loosening according to the vibration mode and the natural frequency of the transmission tower before and after the local loosening occurs, wherein the compliance matrix comprises compliance of each measurement point of the transmission tower, and the calculating further comprises:
and determining each measuring point of the power transmission tower, testing the acceleration response of the power transmission tower before and after the local loosening, and calculating the acceleration response through mode identification to obtain the vibration mode and the inherent frequency of each order of the power transmission tower before and after the local loosening.
Preferably, the calculating the compliance matrix of the transmission tower before and after the local loosening according to the vibration mode and the natural frequency of the transmission tower before and after the local loosening is specifically as follows:
and calculating the flexibility matrix of the power transmission tower before and after the local loosening according to the low-order vibration mode and the low-order natural frequency of the power transmission tower before and after the local loosening.
Preferably, the amplifying each damage index and calculating the proportion of each amplified damage index specifically are:
and calculating the derivative of each damage index, and calculating the proportion of the derivative corresponding to each damage index.
Preferably, the derivative of each of the damage indicators is a first derivative of each of the damage indicators.
Preferably, the calculation formula of the first derivative of each damage indicator is as follows:
in the formula, deltajAnd the damage index of the jth test point is obtained.
According to another aspect of the present invention, there is provided a power transmission tower local connection looseness recognition apparatus, including:
the second calculation module is used for calculating a flexibility matrix of the power transmission tower before and after the local loosening according to the vibration mode and the inherent frequency of the power transmission tower before and after the local loosening, and the flexibility matrix comprises all flexibility coefficients of all measurement points of the power transmission tower;
the third calculation module is used for calculating a damage index of each measuring point, wherein the damage index is equal to the maximum flexibility coefficient variable quantity of each measuring point after local loosening is correspondingly divided by the maximum flexibility coefficient of each measuring point before local loosening;
and the fourth calculation module is used for amplifying each damage index, calculating the proportion of each amplified damage index, and determining the measurement point corresponding to the maximum proportion as the local loosening position of the power transmission tower.
The invention provides a device for identifying local connection looseness of a power transmission tower, which further comprises:
the first calculation module is used for determining each measuring point of the power transmission tower, testing the acceleration response of the power transmission tower before and after the power transmission tower is locally loosened through a modal test, and calculating the acceleration response through modal identification to obtain each order vibration mode and each order natural frequency of the power transmission tower before and after the power transmission tower is locally loosened.
According to another aspect of the present invention, there is provided a power transmission tower local connection looseness recognition apparatus, including: a memory, and a processor coupled to the memory;
the processor is configured to execute the transmission tower local connection loosening identification method as described above based on instructions stored in the memory device.
According to another aspect of the present invention, there is provided a computer readable medium having stored thereon a computer program which, when executed by a processor, implements the transmission tower local connection looseness identification method described above.
According to the technical scheme, the embodiment of the invention has the following advantages:
the invention provides a method and a device for identifying local connection looseness of a power transmission tower, wherein the method comprises the following steps: calculating a flexibility matrix before and after the local loosening of the power transmission tower according to the vibration mode and the inherent frequency of the power transmission tower before and after the local loosening, wherein the flexibility matrix comprises all flexibility coefficients of each measuring point of the power transmission tower; calculating a damage index of each measuring point, wherein the damage index is equal to the maximum flexibility coefficient variable quantity of each measuring point after local loosening is generated and is correspondingly divided by the maximum flexibility coefficient of each measuring point before local loosening is generated; amplifying each damage index, calculating the proportion of each amplified damage index, and determining the measuring point corresponding to the maximum proportion as the local loosening position of the power transmission tower. According to the invention, after the power transmission tower structure has a local loosening fault, the flexibility change rate of each test point is calculated as a damage index, and the fault monitoring and diagnosis is carried out on the structure.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a schematic flow chart illustrating an embodiment of a method for identifying a local connection looseness of a transmission tower according to the present invention;
fig. 2 is a schematic flow chart of another embodiment of a method for identifying partial connection looseness of a transmission tower according to the present invention;
fig. 3 is a schematic structural diagram of an embodiment of a device for identifying partial connection looseness of a transmission tower according to the present invention;
fig. 4 is a schematic diagram of a local loosening recognition result.
Detailed Description
The embodiment of the invention provides a method and a device for identifying local connection looseness of a power transmission tower, which can be used for monitoring and diagnosing faults of a power transmission tower structure.
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the embodiments described below are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, an embodiment of a method for identifying a local connection looseness of a transmission tower according to the present invention includes:
101. calculating a flexibility matrix before and after the local loosening of the power transmission tower according to the vibration mode and the inherent frequency of the power transmission tower before and after the local loosening, wherein the flexibility matrix comprises all flexibility coefficients of each measuring point of the power transmission tower;
102. calculating a damage index of each measuring point, wherein the damage index is equal to the maximum flexibility coefficient variable quantity of each measuring point after local loosening is generated and is correspondingly divided by the maximum flexibility coefficient of each measuring point before local loosening is generated;
103. amplifying each damage index, calculating the proportion of each amplified damage index, and determining the measuring point corresponding to the maximum proportion as the local loosening position of the power transmission tower.
The invention provides a method for identifying local connection looseness of a power transmission tower, which comprises the following steps: calculating a flexibility matrix before and after the local loosening of the power transmission tower according to the vibration mode and the inherent frequency of the power transmission tower before and after the local loosening, wherein the flexibility matrix comprises all flexibility coefficients of each measuring point of the power transmission tower; calculating a damage index of each measuring point, wherein the damage index is equal to the maximum flexibility coefficient variable quantity of each measuring point after local loosening is generated and is correspondingly divided by the maximum flexibility coefficient of each measuring point before local loosening is generated; amplifying each damage index, calculating the proportion of each amplified damage index, and determining the measuring point corresponding to the maximum proportion as the local loosening position of the power transmission tower. According to the invention, after the power transmission tower structure has a local loosening fault, the flexibility change rate of each test point is calculated as a damage index, and the fault monitoring and diagnosis is carried out on the structure.
In the above, for a more specific description, another embodiment of a method for identifying a local connection looseness of a transmission tower is provided below, and referring to fig. 2, another embodiment of a method for identifying a local connection looseness of a transmission tower provided by the present invention includes:
201. determining each measuring point of the power transmission tower, testing acceleration response of the power transmission tower before and after local loosening through a modal test, and calculating the acceleration response through modal identification to obtain each order vibration mode and each order inherent frequency of the power transmission tower before and after local loosening;
in this embodiment, a plurality of measurement points are arranged on the power transmission tower in advance, then the acceleration response of the power transmission tower before and after the local loosening is detected through a modal test, and then the acceleration response is calculated through modal identification to obtain the vibration modes of each order and the natural frequencies of each order before and after the local loosening is generated.
202. Calculating a flexibility matrix of the power transmission tower before and after the local loosening according to the low-order vibration mode and the low-order inherent frequency of the power transmission tower before and after the local loosening, wherein the flexibility matrix comprises all flexibility coefficients of each measuring point of the power transmission tower;
in this embodiment, the calculation formula of the compliance matrix is as follows:
in the formula, FuIn order for the compliance matrix to be before local loosening occurs,
in order to generate the ith order mode before the local loosening,
for the ith order natural frequency before local loosening occurs, FdFor the compliance matrix after the local loosening has occurred,
for the ith order mode after the local loosening,
the i-th order natural frequency after the local loosening occurs.
Considering the problem that the middle-high order mode is difficult to measure in practice, the invention takes the low order mode shape and the low order natural frequency for calculation, such as the first three order mode shape and the first three order natural frequency, and n in the above formula is equal to 3.
The compliance matrix includes all compliance coefficients of each measurement point of the power transmission tower, and the jth measurement point is taken as an explanation, and the jth column of the compliance matrix includes the compliance coefficient of the jth measurement point itself and the compliance coefficient between the jth measurement point and any other measurement point.
203. Calculating a damage index of each measuring point, wherein the damage index is equal to the maximum flexibility coefficient variable quantity of each measuring point after local loosening is generated and is correspondingly divided by the maximum flexibility coefficient of each measuring point before local loosening is generated;
the calculation formula for calculating the damage index is as follows:
Δ＝Fu-Fd
in the formula,. DELTA.jIs the jth column in delta, i.e. the variation of each compliance coefficient of the jth measurement point after the local loosening occurs. max is then represented as ΔjThe maximum value is found.
Is FuColumn j, i.e. before local loosening occurs, the respective compliance coefficients of the jth measurement point.
204. And calculating the derivative of each damage index, calculating the proportion of the derivative corresponding to each damage index, and determining the measuring point corresponding to the maximum proportion as the local loosening position of the power transmission tower.
In order to amplify the fault signature, the damage indicators may be amplified by calculating the derivative of each damage indicator.
Alternatively, the derivative of each damage indicator may be a first derivative of each damage indicator. The calculation formula of the first derivative of each damage index is as follows:
in the formula, deltajAnd the damage index of the jth test point is obtained. l is the distance between two test points.
And finally, calculating the proportion of the corresponding derivative of each test point through normalization treatment:
in the formula, PjThe ratio of the corresponding derivative to the jth test point. And the measuring point corresponding to the maximum proportion is determined as the local loosening position of the transmission tower, 19 measuring points are arranged, the proportion of the derivatives of the 19 measuring points is shown in figure 4, and an obvious peak exists at the 10 th measuring point, which indicates that the local loosening fault occurs at the 10 th measuring point of the measured structure.
In the above, a method for identifying the local connection looseness of the power transmission tower according to the present invention is described in detail, and in the following, referring to fig. 3, an embodiment of an apparatus for identifying the local connection looseness of the power transmission tower according to the present invention includes:
the first calculation module 301 is configured to determine each measurement point of the power transmission tower, test acceleration responses of the power transmission tower before and after the power transmission tower is locally loosened through a modal test, and calculate the acceleration responses through modal identification to obtain each order of vibration mode and each order of natural frequency of the power transmission tower before and after the power transmission tower is locally loosened;
a second calculating module 302, configured to calculate a compliance matrix before and after the local loosening of the power transmission tower according to the vibration mode and the natural frequency of the power transmission tower before and after the local loosening, where the compliance matrix includes all compliance coefficients of each measurement point of the power transmission tower;
a third calculating module 303, configured to calculate a damage index of each measurement point, where the damage index is equal to a maximum compliance coefficient variation of each measurement point after the local loosening is performed and is correspondingly divided by a maximum compliance coefficient of each measurement point before the local loosening is performed;
and the fourth calculating module 304 is configured to amplify each damage index, calculate a ratio occupied by each amplified damage index, and determine a measurement point corresponding to the maximum ratio as a local loosening position of the power transmission tower.
Further, the second calculation module 302 is further configured to calculate a compliance matrix of the transmission tower before and after the local loosening according to the low-order mode shape and the low-order natural frequency of the transmission tower before and after the local loosening, wherein the compliance matrix includes all compliance coefficients of each measurement point of the transmission tower.
Further, the fourth calculation module 304 is further configured to calculate a derivative of each damage indicator, calculate a ratio of the derivative corresponding to each damage indicator, and determine a measurement point corresponding to the maximum ratio as the local loosening position of the transmission tower.
Further, the derivative of each damage indicator is a first derivative of each damage indicator.
Further, the first derivative of each damage indicator is calculated as:
in the formula, deltajAnd the damage index of the jth test point is obtained.
Another embodiment of the present invention provides a device for identifying a local connection looseness of a power transmission tower, comprising: a memory, and a processor coupled to the memory;
the processor is configured to execute the transmission tower local connection loosening identification method as described above based on instructions stored in the memory device.
The present invention also relates to a computer-readable medium, on which a computer program is stored, which when executed by a processor implements the above-described transmission tower local connection looseness identification method.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (7)
1. A method for identifying local connection looseness of a power transmission tower is characterized by comprising the following steps:
calculating a flexibility matrix of the power transmission tower before and after the local loosening according to the vibration mode and the inherent frequency of the power transmission tower before and after the local loosening, wherein the flexibility matrix comprises all flexibility coefficients of all measuring points of the power transmission tower;
calculating a damage index of each measuring point, wherein the damage index is equal to the maximum flexibility coefficient variation of each measuring point after local loosening is generated and is correspondingly divided by the maximum flexibility coefficient of each measuring point before local loosening is generated;
calculating the derivative of each damage index through a first derivative, and calculating the proportion of the derivative corresponding to each damage index; determining the measuring point corresponding to the maximum proportion as the local loosening position of the power transmission tower;
the first derivative is calculated as:
in the formula, deltajThe damage index of the jth test point is l, and the distance between the two test points is l;
calculating the proportion of the corresponding derivative of each test point through normalization treatment:
in the formula, PjThe ratio of the corresponding derivative to the jth test point.
2. The method for identifying the local connection looseness of the transmission tower according to claim 1, wherein the step of calculating a compliance matrix of the transmission tower before and after the local looseness according to the vibration mode and the natural frequency of the transmission tower before and after the local looseness occurs, wherein the compliance matrix comprises compliance of each measurement point of the transmission tower, and the method further comprises the following steps:
and determining each measuring point of the power transmission tower, testing the acceleration response of the power transmission tower before and after the local loosening, and calculating the acceleration response through mode identification to obtain the vibration mode and the inherent frequency of each order of the power transmission tower before and after the local loosening.
3. The method for identifying the local connection looseness of the transmission tower according to claim 2, wherein the step of calculating the compliance matrix of the transmission tower before and after the local looseness according to the vibration mode and the natural frequency of the transmission tower before and after the local looseness is specifically as follows:
and calculating the flexibility matrix of the power transmission tower before and after the local loosening according to the low-order vibration mode and the low-order natural frequency of the power transmission tower before and after the local loosening.
4. A transmission tower local connection looseness identification device, comprising:
the second calculation module is used for calculating a flexibility matrix of the power transmission tower before and after the local loosening according to the vibration mode and the inherent frequency of the power transmission tower before and after the local loosening, and the flexibility matrix comprises all flexibility coefficients of all measurement points of the power transmission tower;
the third calculation module is used for calculating a damage index of each measuring point, wherein the damage index is equal to the maximum flexibility coefficient variable quantity of each measuring point after local loosening is correspondingly divided by the maximum flexibility coefficient of each measuring point before local loosening;
the fourth calculation module is used for amplifying each damage index, calculating the proportion of each amplified damage index, and determining the measurement point corresponding to the maximum proportion as the local loosening position of the power transmission tower;
calculating the derivative of each damage index through a first derivative, and calculating the proportion of the derivative corresponding to each damage index; determining the measuring point corresponding to the maximum proportion as the local loosening position of the power transmission tower;
the first derivative is calculated as:
in the formula, deltajThe damage index of the jth test point is l, and the distance between the two test points is l;
calculating the proportion of the corresponding derivative of each test point through normalization treatment:
in the formula, PjThe ratio of the corresponding derivative to the jth test point.
5. The device for identifying partial connection loosening of a transmission tower according to claim 4, further comprising:
the first calculation module is used for determining each measuring point of the power transmission tower, testing the acceleration response of the power transmission tower before and after the power transmission tower is locally loosened through a modal test, and calculating the acceleration response through modal identification to obtain each order vibration mode and each order natural frequency of the power transmission tower before and after the power transmission tower is locally loosened.
6. A transmission tower local connection looseness identification device, comprising: a memory, and a processor coupled to the memory;
the processor is configured to execute the transmission tower local connection looseness identification method according to any one of claims 1 to 3, based on instructions stored in the memory device.
7. A computer-readable medium, on which a computer program is stored, wherein the program, when executed by a processor, implements the method for identifying partial connection loosening of a transmission tower according to any of claims 1 to 3.
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