CN104897236A - Vibration monitoring method of liquid level of vehicle-mounted liquefied natural gas tank - Google Patents
Vibration monitoring method of liquid level of vehicle-mounted liquefied natural gas tank Download PDFInfo
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- CN104897236A CN104897236A CN201510308602.8A CN201510308602A CN104897236A CN 104897236 A CN104897236 A CN 104897236A CN 201510308602 A CN201510308602 A CN 201510308602A CN 104897236 A CN104897236 A CN 104897236A
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- China
- Prior art keywords
- natural gas
- gas tank
- liquefied natural
- liquid level
- elastic support
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- 239000003949 liquefied natural gas Substances 0.000 title claims abstract description 48
- 239000007788 liquid Substances 0.000 title claims abstract description 18
- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000012544 monitoring process Methods 0.000 title claims abstract description 14
- 230000001133 acceleration Effects 0.000 claims abstract description 4
- 230000005484 gravity Effects 0.000 claims abstract description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 24
- 230000033764 rhythmic process Effects 0.000 claims description 2
- 230000009897 systematic effect Effects 0.000 claims description 2
- 238000012423 maintenance Methods 0.000 abstract description 4
- 230000032683 aging Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000012806 monitoring device Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
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- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The invention discloses a vibration monitoring method of liquid level of a vehicle-mounted liquefied natural gas tank. The vehicle-mounted liquefied natural gas tank is connected with a vehicle floor through an elastic support; the center of gravity of the liquefied natural gas is superposed to the center of rigidity of the elastic support; an acceleration sensor is used for acquiring a vibration signal of a connection of the elastic support and the liquefied natural gas tank and acquiring vibrational frequency Omega of vertical translation of a system; a processor calculates weight of the system; the processor acquires the weight of the system and storage of liquefied natural gas when the liquefied natural gas tank is of no load, so as to acquire a liquid level value. The vibration monitoring method has the advantages that the liquid level can be monitored in real time during running of the vehicle and fault maintenance is easy.
Description
Technical field
The present invention relates to a kind of monitoring method of liquified natural gas tank liquid level, particularly relate to a kind of vibration monitoring method of vehicle liquefied natural gas tank liquid level.
Background technology
Liquified natural gas tank is for storing liquefied natural gas (LNG), and the monitoring device of the liquefied natural gas (LNG) liquid level adopted at present is electric capacity built-in type.Capacitance type sensor is pre-installed appropriately in vacuum-packed liquified natural gas tank, the height difference of liquefied natural gas (LNG) liquid level makes sensor produce different electric capacitys, and the electric capacity according to initial capacitance during zero load and full load calculates the current liquefied natural gas (LNG) liquid level of acquisition in real time.Because capacitance type sensor needs to be pre-installed in tank interior, therefore carry out at liquified natural gas tank, in the process sealing and vacuumize, easily causing damage to capacitance type sensor.And in use after a period of time, capacitance type sensor itself also may because a variety of causes such as device aging produce fault.Because liquified natural gas tank cannot cut maintenance open, so whole liquified natural gas tank can only be scrapped process after capacitance level transducer fault, cause a large amount of loss.
Summary of the invention
For above-mentioned the deficiencies in the prior art, the object of this invention is to provide a kind of vibration monitoring method of vehicle liquefied natural gas tank liquid level, solve the problem of vehicle liquefied natural gas tank level monitoring and maintenance difficult.
Technical scheme of the present invention is such: a kind of vibration monitoring method of vehicle liquefied natural gas tank liquid level, comprises the following steps:
S01 arranges some elastic supports on car floor, and the upper end of described elastic support is fixedly connected with liquified natural gas tank, and the center of gravity of liquified natural gas tank is overlapped with the center of rigidity of elastic support;
S02 gathers the vibration signal of described elastic support and liquified natural gas tank junction by acceleration transducer and sends processor to;
The vibration frequency ω extracting vertical direction translation analyzed by S03 processor from vibration signal;
The systematic vertical directional stiffness that S04 liquified natural gas tank and elastic support are formed is K, and processor calculates the mass M=K/ ω of described system
2;
S05 processor obtains liquefied natural gas (LNG) storage quality Δ M=M-M
0, and obtain corresponding liquefied natural gas (LNG) level value according to liquefied natural gas (LNG) storage quality Δ M, described M
0for the quality of described system during liquified natural gas tank zero load.
Preferably, described S03 filters the rhythm of engine of described automobile from vibration signal, then obtains the vibration frequency ω of vertical direction translation.
Preferably, described elastic support is provided with four.
The advantage of technical scheme provided by the present invention is, elastic support is placed in outside liquified natural gas tank, not by environmental impacts such as vacuum in liquified natural gas tank, is convenient to breakdown maintenance; All the time produce vibration due to during vehicle operating, therefore this method still can liquid level in Real-Time Monitoring liquified natural gas tank.
Accompanying drawing explanation
Fig. 1 is elastic support and liquified natural gas tank and car floor syndeton schematic diagram
Embodiment
Below in conjunction with embodiment, the invention will be further described, but not as a limitation of the invention.
Incorporated by reference to Fig. 1, first on vehicle liquefied natural gas tank 1 bottom car floor 3, a set of elastic support 2 is installed, makes four according to the large young pathbreaker's elastic support 2 of the volume of vehicle liquefied natural gas tank 1, vehicle liquefied natural gas tank 1 is arranged on this elastic support 2.Four elastic supports 2 are arranged on support 4 base of liquified natural gas tank 1, and adjusting pole 4 position, the center of gravity of vehicle liquefied natural gas tank 1 and the center of rigidity of elastic support 2 are overlapped.Liquified natural gas tank 1 and elastic support 2 are by the rigidity vibrational system of a composition four-degree-of-freedom.Adopt acceleration transducer to gather the vibration signal of elastic support and liquified natural gas tank junction, passed to processor by data collecting card.And by the frequency filter of processor to dynamic excitations such as the periodic vibrations produced by motor car engine in this vibration signal.Analyze this time domain response signal, each rank vibration frequency of vehicle liquefied natural gas can system can be obtained, vertical translation vibration frequency is extracted and analyzes its change.By formula M=K/ ω
2can obtain the gross mass M of now rigidity vibrational system, wherein K is the rigidity of the vertical direction of rigidity vibrational system, and ω is the vertical translation vibration frequency of aforementioned acquisition.By the empty mass M of the rigidity vibrational system obtained in advance
0, liquefied natural gas (LNG) storage quality Δ M=M-M can be obtained
0, then obtain the volume of liquefied natural gas (LNG) according to liquefied natural gas quality and volume relationship, and then obtain liquid level value.Vibration due to vehicle liquefied natural gas tank excited by the vehicle body moved, and in vehicle operation, it is in vibrational state all the time, therefore can carry liquified natural gas tank liquefied natural gas (LNG) liquid level in operational process by monitoring car at any time.
Claims (3)
1. a vibration monitoring method for vehicle liquefied natural gas tank liquid level, is characterized in that, comprise the following steps:
S01 arranges some elastic supports on car floor, and the upper end of described elastic support is fixedly connected with liquified natural gas tank, and the center of gravity of liquified natural gas tank is overlapped with the center of rigidity of elastic support;
S02 gathers the vibration signal of described elastic support and liquified natural gas tank junction by acceleration transducer and sends processor to;
The vibration frequency ω extracting vertical direction translation analyzed by S03 processor from vibration signal;
The systematic vertical directional stiffness that S04 liquified natural gas tank and elastic support are formed is K, and processor calculates the mass M=K/ ω of described system
2;
S05 processor obtains liquefied natural gas (LNG) storage quality Δ M=M-M
0, and obtain corresponding liquefied natural gas (LNG) level value according to liquefied natural gas (LNG) storage quality Δ M, described M
0for the quality of described system during liquified natural gas tank zero load.
2. the vibration monitoring method of vehicle liquefied natural gas tank liquid level according to claim 1, is characterized in that: described S03 filters the rhythm of engine of described automobile from vibration signal, then obtains the vibration frequency ω of vertical direction translation.
3. the vibration monitoring method of vehicle liquefied natural gas tank liquid level according to claim 1, is characterized in that: described elastic support is provided with four.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510308602.8A CN104897236A (en) | 2015-06-08 | 2015-06-08 | Vibration monitoring method of liquid level of vehicle-mounted liquefied natural gas tank |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510308602.8A CN104897236A (en) | 2015-06-08 | 2015-06-08 | Vibration monitoring method of liquid level of vehicle-mounted liquefied natural gas tank |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104897236A true CN104897236A (en) | 2015-09-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510308602.8A Pending CN104897236A (en) | 2015-06-08 | 2015-06-08 | Vibration monitoring method of liquid level of vehicle-mounted liquefied natural gas tank |
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| CN (1) | CN104897236A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107894262A (en) * | 2017-10-13 | 2018-04-10 | 潍柴动力股份有限公司 | Liquid level emasuring device and method, engine |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2395259Y (en) * | 1999-10-08 | 2000-09-06 | 陈志强 | Dynamic electronic automobile scale |
| CN201945363U (en) * | 2011-01-19 | 2011-08-24 | 赵健聪 | Metering device for automobile fuel of liquefied nature gas |
| CN102589643A (en) * | 2012-02-23 | 2012-07-18 | 青岛贵和科技有限公司 | Method for indirectly measuring liquid level and volume of liquid in storage tank and gravitational method based level instrument |
| CN203116801U (en) * | 2013-02-26 | 2013-08-07 | 陕西重型汽车有限公司 | Liquid level metering device of liquefied natural gas (LNG) heavy duty truck |
-
2015
- 2015-06-08 CN CN201510308602.8A patent/CN104897236A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2395259Y (en) * | 1999-10-08 | 2000-09-06 | 陈志强 | Dynamic electronic automobile scale |
| CN201945363U (en) * | 2011-01-19 | 2011-08-24 | 赵健聪 | Metering device for automobile fuel of liquefied nature gas |
| CN102589643A (en) * | 2012-02-23 | 2012-07-18 | 青岛贵和科技有限公司 | Method for indirectly measuring liquid level and volume of liquid in storage tank and gravitational method based level instrument |
| CN203116801U (en) * | 2013-02-26 | 2013-08-07 | 陕西重型汽车有限公司 | Liquid level metering device of liquefied natural gas (LNG) heavy duty truck |
Non-Patent Citations (1)
| Title |
|---|
| 质量技术监督行业职业技能鉴定指导中心组: "《衡器计量》", 31 March 2014 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107894262A (en) * | 2017-10-13 | 2018-04-10 | 潍柴动力股份有限公司 | Liquid level emasuring device and method, engine |
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| SE01 | Entry into force of request for substantive examination | ||
| CB03 | Change of inventor or designer information |
Inventor after: He Hua Inventor after: Sun Jianping Inventor after: Chen Qidong Inventor after: Zheng Wangan Inventor after: Chen Yuanyuan Inventor before: He Hua Inventor before: Sun Jianming Inventor before: Chen Qidong Inventor before: Zheng Wangan Inventor before: Chen Yuanyuan |
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| COR | Change of bibliographic data | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20150909 |