Micro differential pressure acquisition device based on moving average algorithm
By using a micro-differential pressure acquisition device based on a moving average algorithm, the problem of monitoring pressure changes in the insulation space of a membrane-type LNG containment system was solved, improving the stability and accuracy of airtightness testing and making it suitable for non-destructive testing of membrane-type LNG containment systems.
Patent Information
- Application Number
- CN202423233206.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-26
- Publication Date
- 2026-01-02
- Estimated Expiration
- 2034-12-26
AI Technical Summary
Existing technologies are insufficient to accurately and reliably monitor pressure changes in the insulation space of membrane-type LNG containment systems, resulting in inaccurate airtightness testing.
The micro-differential pressure acquisition device based on the moving average algorithm includes a micro-differential pressure module, a power supply module, a data acquisition module, a central processing module, and a display module. It acquires signals through a micro-differential pressure sensor and processes them using the moving average algorithm to eliminate fluctuations caused by short-term extreme values and achieve real-time monitoring.
It improves the stability and accuracy of the tightness detection of the membrane-type LNG containment system, enables 48-hour real-time monitoring during full-cabin testing, reduces system noise, and provides reliable signal data.
Smart Images
Figure CN223756208U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to nondestructive testing technical field especially relates to a micro pressure difference collection device based on moving average algorithm. BACKGROUND
[0002] In order to guarantee the construction quality and product quality of the film type LNG containment system, the nondestructive testing of the film type containment system is particularly important, since the containment system itself structure is thin invar steel, usually 0.7mm thick, leading to the application of conventional nondestructive testing technology in the detection of plate wall weld defects is limited, therefore, the density detection technology is used to replace.
[0003] The density detection of the film type LNG containment system includes multiple processes, wherein the whole cabin test confirms the overall leakage rate and integrity of the insulation layer by continuously monitoring the pressure change of the insulation space of the liquid cargo tank for 48 hours, but considering that the liquid cargo tank body space is large, the actual overall leakage rate is small, therefore, the micro pressure difference monitoring system needs to be used to monitor the pressure change inside the insulation space, at present, how to accurately and reliably realize the insulation space pressure monitoring is a big difficulty in the field of LNG containment system density detection. SUMMARY
[0004] The utility model discloses a micro pressure difference collection device based on moving average algorithm.
[0005] In order to realize the above-mentioned purpose, the technical scheme of the utility model is:
[0006] A micro pressure difference collection device based on moving average algorithm, characterized by including micro pressure difference module, power module, data acquisition module, central processing module and display module, the micro pressure difference module includes micro pressure difference sensor, the micro pressure difference sensor is powered by independent power supply, the detection end of the micro pressure difference sensor is located in the insulation space of the LNG containment system, the signal end of the micro pressure difference sensor outputs direct current voltage signal, the data acquisition module acquires the direct current voltage signal of the micro pressure difference sensor and is transmitted to the central processing module through the analog-digital acquisition module, the display module receives the data sent by the central processing module and shows, the power module supplies direct current voltage for the data acquisition module and the central processing module.
[0007] Further, the signal end of the micro pressure difference sensor outputs 0-10V direct current voltage signal.
[0008] Further, the power module supplies 24V direct current voltage for the data acquisition module and the central processing module.
[0009] The utility model discloses through micro pressure difference collection, can realize the real time monitoring in LNG liquid cargo tank whole cabin test, according to need, the parameter of flexible setting eliminates the influence of extreme value in micro pressure difference signal, improves the detection stability. Attached Figure Description
[0010] Figure 1 This is a schematic diagram of the system structure of this utility model;
[0011] Figure 2 This is a flowchart of the algorithm of this utility model.
[0012] Figure label:
[0013] 1. Micro differential pressure module, 2. Data acquisition module, 3. Central processing module, 4. Display module, 5. Power supply module. Detailed Implementation
[0014] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.
[0015] This utility model discloses a micro-differential pressure acquisition device based on a moving average algorithm, such as... Figure 1 As shown, it includes a micro differential pressure module 1, a power supply module 5, a data acquisition module 2, a central processing module 3, and a display module 4.
[0016] The differential pressure module 1 includes a differential pressure sensor, which is powered by an independent power supply. The detection end of the differential pressure sensor is located in the insulation space of the LNG containment system, and the signal end of the differential pressure sensor outputs a 0-10V DC voltage signal.
[0017] Data acquisition module 2 acquires the DC voltage signal from the micro differential pressure sensor and transmits it to central processing module 3 via analog-to-digital conversion module. Display module 4 receives the data sent by central processing module 3 and displays it in the form of charts, realizing visualization of micro differential pressure data.
[0018] Power module 5 supplies 24V DC voltage to data acquisition module 2 and central processing module 3.
[0019] Signal processing methods for micro differential pressure acquisition devices based on moving average algorithms, such as... Figure 2 As shown, the central processing module 3 uses a moving average algorithm to post-process the signals acquired by the micro differential pressure sensor, eliminating fluctuations caused by short-term extreme values in the signal. The moving average algorithm includes the following steps:
[0020] Step S1) Read the differential pressure data sequence {AT} output by the analog-to-digital acquisition module after the signal acquired by the differential pressure sensor is processed.
[0021] T represents the length of the differential pressure data sequence.
[0022] Step S2) setting the number of terms N participating in the moving average, thereby creating a data set {FN} with length N,
[0023] The number of terms N can be freely set according to requirements, and the initial data set {FN} is all assigned 0.
[0024] Step S3) moving the calculation result Ft according to the moving average calculation formula and sequentially storing it in the data set {FN}, to obtain smoothed data;
[0025] The moving average calculation formula is:
[0026]
[0027] In the formula, Ft is the calculation result, i.e., the current smoothed data, At -N is the previous N measured values of the current measured data.
[0028] The micro-pressure difference acquisition device of the utility model realizes 48-hour micro-pressure difference real-time monitoring in the full-cabin test of LNG liquid cargo tank, can flexibly set the number of data N participating in the moving average calculation according to actual requirements, eliminates short-term data fluctuations, makes long-term trends more obvious, can also reduce system noise, and provides reliable signal data.
[0029] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the utility model, and not to limit them; although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model.
Claims
1. A micro differential pressure acquisition device based on a moving average algorithm, characterized in that, The micro-pressure difference module (1), the power module (5), the data acquisition module (2), the central processing module (3) and the display module (4) are included, the micro-pressure difference module (1) includes a micro-pressure difference sensor, the micro-pressure difference sensor is powered by an independent power supply, the detection end of the micro-pressure difference sensor is located in the insulation space of the LNG enclosure system, the signal end of the micro-pressure difference sensor outputs a direct current voltage signal, the data acquisition module (2) acquires the direct current voltage signal of the micro-pressure difference sensor and transmits the signal to the central processing module (3) through an analog-digital acquisition module, the display module (4) receives the data sent by the central processing module (3) and displays, and the power module (5) supplies direct current voltage for the data acquisition module (2) and the central processing module (3).
2. The micro differential pressure acquisition device based on the moving average algorithm according to claim 1, characterized in that, The signal end of the micro-pressure difference sensor outputs a 0-10 V direct current voltage signal.
3. The micro differential pressure acquisition device based on the moving average algorithm according to claim 2, characterized in that, The power module (5) supplies 24 V direct current voltage for the data acquisition module (2) and the central processing module (3).