CN-115270370-B - Pipeline sensor arrangement method based on modal feature extraction and inversion

CN115270370BCN 115270370 BCN115270370 BCN 115270370BCN-115270370-B

Abstract

The invention discloses a pipeline sensor arrangement method based on modal feature extraction and inversion, which comprises the steps of establishing a three-dimensional model of a pipeline, leading the three-dimensional model into a numerical simulation system to obtain the pipeline model, carrying out modal analysis to obtain each-order vibration modal response of the pipeline model, a vibration mode and a preset position of a sensor, obtaining a feature matrix of a full-order vibration response function through the preset position of the sensor, arranging the sensor according to the preset position of the sensor, measuring a vibration response vector, inverting the vibration characteristic value according to the feature matrix, calculating a vibration calculated value of any point in the pipeline through the vibration characteristic value and the vibration mode of each-order vibration modal response of the pipeline model, comparing the vibration calculated value with an actual measured value to obtain inversion error, if the inversion error exceeds 10%, increasing the modal analysis order, and repeating the process, otherwise, outputting the arrangement position of the sensor. The invention uses fewer sensors to obtain the comprehensive vibration characteristics on the pipeline, thereby reducing the cost.

Inventors

WAN YU
Jin Chuanling
LIN SHAOCHEN

Assignees

江苏方天电力技术有限公司

Dates

Publication Date: 20260505
Application Date: 20220623

Claims (4)

1. The pipeline sensor arrangement method based on modal feature extraction and inversion is characterized by comprising the following steps of: Step 1, establishing a three-dimensional model of a pipeline according to an engineering drawing, importing the model into an ANSYS Workbench numerical simulation system, dividing grids, setting pipeline operation parameters according to an application scene of the pipeline, and setting a modal analysis initial order to obtain a pipeline model; Step 2, carrying out modal analysis on the obtained pipeline model, obtaining the modal response, the vibration mode and the preset position of the sensor of each order vibration of the pipeline model, and obtaining a characteristic matrix of a full-order vibration response function through the preset position of the sensor, wherein the method comprises the following sub-steps: Step 21, carrying out modal analysis and calculation on the pipeline model to obtain vibration displacement response and vibration mode of the pipeline model in each mode, taking the maximum response position of each order mode of the pipeline model as a preset sensor arrangement position, and numbering; Step 22, obtaining a vibration response function according to a displacement characteristic B 1 and a frequency characteristic B 2 of pipeline vibration at a sensor arrangement position, and forming a characteristic matrix B of a full-order vibration response function by the displacement characteristic B 1 and the frequency characteristic B 2 ; Step 3, arranging a sensor according to a preset position of the sensor, measuring a vibration response vector, and inverting a vibration characteristic value by combining a characteristic matrix; And 4, calculating a vibration calculated value of any point in the pipeline through the vibration characteristic value and the vibration mode response of each order of vibration modes of the pipeline model, comparing the vibration calculated value with the actual measured value to obtain an inversion error, if the inversion error exceeds 10%, increasing the mode analysis order, and repeating the steps 2-4, otherwise, outputting the arrangement position of the sensor.
2. The method for arranging pipeline sensors based on modal feature extraction and inversion according to claim 1, wherein the feature matrix 。
3. The method for arranging the pipeline sensor based on modal feature extraction and inversion according to claim 1, wherein the process of inverting the vibration feature value in the step 3 is as follows: wherein B is a feature matrix, C is a vibration feature value, and D is a measured vibration response vector.
4. The method for arranging a pipeline sensor based on modal feature extraction and inversion according to claim 1, wherein the initial order of modal analysis is set to 6.

Description

Pipeline sensor arrangement method based on modal feature extraction and inversion Technical Field The invention relates to the technical field of pipeline sensor arrangement, in particular to a pipeline sensor arrangement method based on modal feature extraction and inversion. Background Various mechanical equipment and supporting pipeline structures can be monitored in real time according to the existing software and hardware equipment and observation means. The intelligent diagnosis can be carried out on the working condition of the equipment according to the monitored data, and serious safety accidents are avoided even if emergency measures are taken when mechanical faults occur. As a key matching structure for maintaining mechanical equipment, the vibration condition of the pipeline directly affects the working state and service life of the related mechanical equipment. To monitor the working condition of the pipeline in real time, the sensors which depend on various signals are matched with each other, the sensors are arranged at reasonable positions to obtain effective monitoring data, and the data recorded by the sensors are uniformly processed by matching with a data central processing system and a specific data calculation method, so that the vibration characteristics of the whole pipeline can be obtained. The existing pipeline vibration sensor arrangement position selection is often based on the structure of a pipeline, and generally comprises the following parts of 1) an elbow with larger pipeline flexibility, 2) a position close to a vibration source, 3) a suspension position between two fixed points, 4) an interface part of the pipeline and important equipment, 5) a part with large concentrated mass such as a valve, a tee joint and the like in the pipeline, and 6) a larger response part in the pipeline modal analysis. However, the selection principle of the monitoring positions of the pipeline vibration sensors is too dependent on the experience of engineers, a unified standardized method is not formed, and the sensor arrangement is frequently subjected to redundancy and invalidation or important information is ignored when critical positions are avoided. Disclosure of Invention Aiming at the problems in the prior art, the invention provides a pipeline sensor arrangement method based on modal feature extraction and inversion, which can use fewer sensors to obtain comprehensive vibration features on a pipeline, reduce the cost of pipeline monitoring equipment, provide effective monitoring data, and can effectively avoid abnormal vibration conditions of the pipeline by matching with a related calculation method. In order to achieve the purpose, the invention provides a pipeline sensor arrangement method based on modal feature extraction and inversion, which comprises the following steps: Step 1, establishing a three-dimensional model of a pipeline according to an engineering drawing, importing the model into an ANSYS Workbench numerical simulation system, dividing grids, setting pipeline operation parameters according to an application scene of the pipeline, and setting a modal analysis initial order to obtain a pipeline model; Step 2, performing modal analysis on the obtained pipeline model, obtaining each-order vibration modal response of the pipeline model, the vibration mode and the preset position of the sensor, and obtaining a feature matrix of a full-order vibration response function through the preset position of the sensor; Step 3, arranging a sensor according to a preset position of the sensor, measuring a vibration response vector, and inverting a vibration characteristic value by combining a characteristic matrix; And 4, calculating a vibration calculated value of any point in the pipeline through the vibration characteristic value and the vibration mode response of each order of vibration modes of the pipeline model, comparing the vibration calculated value with the actual measured value to obtain an inversion error, if the inversion error exceeds 10%, increasing the mode analysis order, and repeating the steps 2-4, otherwise, outputting the arrangement position of the sensor. Further, step 2 comprises the following sub-steps: Step 21, carrying out modal analysis and calculation on the pipeline model to obtain vibration displacement response and vibration mode of the pipeline model in each mode, taking the maximum response position of each order mode of the pipeline model as a preset sensor arrangement position, and numbering; Step 22, obtaining a vibration response function according to the displacement characteristic B 1 and the frequency characteristic B 2 of the pipeline vibration at the sensor arrangement position, and forming a characteristic matrix B of the full-order vibration response function by the displacement characteristic B 1 and the frequency characteristic B 2. Further, the feature matrix b=b 1·B2. Further, the process of inverting the vibration characteristic value