Time Synchronization Method for Detecting Variable-diameter Inertial Navigation Subsystem Data in Pipeline
A subsystem and pipeline technology, which is applied in the fields of variable diameter and inertial navigation subsystems, can solve problems such as synchronous operation failure, odometer slippage, natural gas, pipeline inner wall defects, etc.
Active Publication Date: 2021-01-08
SHENYANG POLYTECHNIC UNIV
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AI Technical Summary
Problems solved by technology
[0004] 2. Synchronization problems between PIG internal subsystems
[0008] 3. Limitations of Existing Synchronization Methods
Even if the odometer maintains its mechanical structure without deformation and damage in a harsh environment of about 100 hours, high-viscosity crude oil, highly corrosive natural gas, and defects in the inner wall of the pipeline may cause the odometer to slip, get stuck, and electrical components fail, etc. Serious Problem
Once the mileage data is partially or completely invalid, all synchronization operations cannot be performed
[0012] 2) The mileage correction causes the relevant synchronization data to be corrected again
This obviously increases the complexity of system data processing and reduces system reliability
Method used
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[0129] step one:
[0130] obtained from step 1 figure 1 , is the original data of the mileage of a typical inertial navigation detection subsystem, the horizontal axis is the number of sampling points, the vertical axis is the mileage signal containing a lot of noise, the signal is essentially a triangular wave level, and m1 on the horizontal axis is the inertial navigation in the ball The number of sampling points at the starting point of the subsystem, the S area near the starting point is in Image 6 zoom in;
[0131] obtained from step 1 figure 2 It is the original data of the mileage of a typical variable-diameter detection subsystem. The horizontal axis is the number of sampling points, and the vertical axis is the mileage signal containing a lot of noise. The signal is essentially a triangular wave level. m2 is the sampling point of the variable-diameter subsystem in the serving tube points. obviously figure 2 data and figure 1 The data waveforms are exactly the...
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The invention discloses a synchronous operation process of PIG variable diameter and inertial navigation subsystem output data based on mileage data time. The process first graphs the mileage data column in the variable diameter and inertial navigation output data matrix, and uses the number of sampling points as the horizontal axis; then uses the start point search method to mark the sampling of the mileage data from static to moving moment in the two graphs Points; and then calculate the time corresponding to the mileage data in the respective system clocks from static to motion; finally, calculate the difference between the two clocks, correct the clocks of the variable diameter and inertial navigation subsystems to the same time, and realize the data synchronization. Adopting the synchronization method of the present invention, compared with the method of using all mileage data as a synchronization reference, can effectively solve the problem of synchronization failure caused by odometer failure or late mileage data correction during the PIG movement, as long as the integrity of the mileage data in the serving cylinder stage is ensured, All output data of the two subsystems can be synchronized.
Description
technical field [0001] The invention relates to a method for synchronizing the output data of the internal subsystem of the detection device in the pipeline, in particular to the two subsystems of the variable diameter and the inertial navigation in the detection device in the pipeline, and the internal detection of the variable diameter / inertial navigation combination of various pipeline diameters system can use this synchronization method. Background technique [0002] 1. In-pipeline detection [0003] The in-pipe inspection device (PIG) can measure the defect or deformation of the pipeline during the movement in the pipeline. PIG usually can be equipped with multiple detection subsystems according to the needs of the current mission. Since each detection subsystem needs to be flexibly combined according to different tasks, each subsystem usually has independent data acquisition and storage capabilities. Since the variable diameter device occupies a relatively small s...
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IPC IPC(8): G06F1/12F17D5/00
CPCF17D5/00G06F1/12
Inventor 靳鹏杨理践邢燕好张佳
Owner SHENYANG POLYTECHNIC UNIV