CN101893644A - Extraction method and extraction device of static pressure of differential pressure type navigational speed measuring instrument - Google Patents
Extraction method and extraction device of static pressure of differential pressure type navigational speed measuring instrument Download PDFInfo
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- CN101893644A CN101893644A CN 201010207429 CN201010207429A CN101893644A CN 101893644 A CN101893644 A CN 101893644A CN 201010207429 CN201010207429 CN 201010207429 CN 201010207429 A CN201010207429 A CN 201010207429A CN 101893644 A CN101893644 A CN 101893644A
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Abstract
The invention discloses an extraction method and extraction device of static pressure of a differential pressure type navigational speed measuring instrument. Static pressure detection drainage holes which penetrate through a sensor seat are arranged at the upper part of the front surface of the sensor seat (relative to the moving direction of an object running on the water surface) and under dynamic pressure detection drainage holes, static pressure holes of the sensor seat are processed in the static pressure detection drainage holes, and a CPU (Central Processing Unit) processes the dynamic pressure electric signals detected by a dynamic pressure detector and the static pressure electric signals detected by a static pressure detector to obtain the navigational speed. The invention can effectively prevent static pressure P2 from being influenced by the additional pressure caused by circumfluence, vortices, wake flow and the other factors from the underwater three-dimensional space, so that the extraction accuracy of the static pressure is improved, thereby improving the measuring accuracy of the navigational speed measuring instrument and more stabilizing the performance; and the invention has the advantages of improving the extraction accuracy of the static pressure, improving the navigability of the navigational speed measuring instrument, simplifying the signal processing, having no need of establishing a complicated model, eliminating the influence of turbulent flow, and the like. The invention can be applied to any object running on the water surface for measuring the water speed.
Description
Technical field
The present invention relates to shipborne equipment, especially relate to a kind of extracting method and static pressure extraction element thereof of differential pressure type navigational speed measuring instrument static pressure.
Background technology
The differential pressure type navigational speed measuring instrument is to detect the head-on dynamic pressure P1 (containing static pressure) that the thing that travels waterborne produces at the volley by differential pressure pick-up, and detects the static pressure P2 that is produced by the depth of water, and both are subtracted each other, and static pressure is offset, and is handled obtaining the speed of a ship or plane again by micro computer.But in the process of moving, because making, the direction uncertainty of the variation of the hydrology, water flow field often is subjected to the additonal pressure that produces as factors such as eddy current, wake flow, circulation among the static pressure P2 from the underwater 3 D space, cause static pressure P2 measuring error, thereby influence the precision that the speed of a ship or plane is measured.
Existing static pressure extraction scheme has following several:
(1) side perforate:
In the left and right sides perforate with respect to dynamic pressure transducer of the kinematic axis of navigational speed measuring instrument, perforate enters static port to current through the left and right sides, and when travelling thing off-duty and water flow field relatively steadily the time, the static pressure that extract this moment is stable; When thing when operation hydrology state that travels changes, the direction of water flow field is also uncertain, produces the indefinite eddy current of direction, circulation etc. thus and directly impacts static port through left and right sides perforate, causes the static pressure instability extracted, directly influences the precision that the speed of a ship or plane is measured.
(2) back perforate:
In the back perforate with respect to dynamic pressure transducer of the kinematic axis of navigational speed measuring instrument, perforate enters static port to current through the back, and when travelling thing off-duty and water flow field relatively steadily the time, the static pressure that extract this moment is stable; When thing when operation hydrology state that travels changes, the direction of water flow field is also uncertain, produces the indefinite eddy current of direction, wake flow, bubble etc. thus and directly impacts static port through the back perforate, causes the static pressure instability extracted, directly influences the precision that the speed of a ship or plane is measured.
(3) bottom opening:
Static port is opened in the bottom of the kinematic axis of navigational speed measuring instrument, and when travel thing off-duty and water flow field were steady relatively, the static pressure that extract this moment was stable; When thing when operation hydrology state that travels changes, the direction of water flow field is also uncertain, produces the indefinite eddy current of direction, wake flow, circulation, bubble etc. thus and directly impacts static port, causes the static pressure instability extracted, directly influences the precision that the speed of a ship or plane is measured.
In sum, above scheme all fails to solve effectively the extraction of current to static pressure.
Summary of the invention
First purpose of the present invention is to provide a kind of extracting method of differential pressure type navigational speed measuring instrument static pressure, it can avoid static pressure P2 to be subjected to the influence of the additonal pressure that produces from factors such as underwater 3 D space such as circulation, eddy current, wake flows effectively, make the extraction precision of static pressure be improved, thereby improve the measuring accuracy of navigational speed measuring instrument, performance is also more stable.
Second purpose of the present invention is to provide a kind of can improve the extraction precision of static pressure, the sea keeping quality that improves navigational speed measuring instrument, static pressure extraction element simple in structure.
First purpose of the present invention is achieved in that
A kind of extracting method of differential pressure type navigational speed measuring instrument static pressure, feature is:
A, navigational speed measuring instrument is installed on the thing that travels waterborne, the dynamic pressure on the sensor holder detects conduction hole and static pressure and detects conduction hole and all can automatically face toward travel direction;
B, current pass dynamic pressure and detect the interior anti-dirt fence of conduction hole, the surface of horizontal impact dynamic pressure detecting device, the dynamic pressure detecting device will detect the dynamic pressure P1 that comprises static pressure that the thing that travels waterborne head-on produces at the volley, and dynamic pressure P1 is converted to the dynamic pressure electric signal flows to CPU on the circuit board;
C, current level are passed sensor holder and are detected conduction hole with respect to the positive bottom of the thing direction of motion of travelling waterborne, the static pressure that runs through sensor holder under the dynamic pressure detection conduction hole, and make progress along the sensor holder baroport to static port, press the static pressure detecting device, the static pressure detecting device will detect the static pressure P2 that is produced by the depth of water, and stable static pressure P2 is converted to the static pressure electric signal flows to CPU on the circuit board;
D, CPU subtract each other dynamic pressure electric signal and the static pressure electric signal that obtains, and offset static pressure, and CPU will subtract each other the data that obtain again to be handled and obtain the speed of a ship or plane.
Second purpose of the present invention is achieved in that
A kind of static pressure extraction element, feature is made up of sensor holder that is connected as a single entity and drainage seat, sensor holder adopts with the kinematic axis shell of the navigational speed measuring instrument that is positioned at the sensor holder top and is threaded, be processed with dynamic pressure at sensor holder with respect to front upper of travelling thing direction of motion waterborne and detect conduction hole, middle-end top in dynamic pressure detects conduction hole is equipped with the dynamic pressure detecting device, positive bottom at sensor holder, be processed with the static pressure that runs through sensor holder under the dynamic pressure detection conduction hole and detect conduction hole, middle-end top in sensor holder is processed with static pressure detection conduction hole and communicates and vertical sensor holder baroport, and the static port place at middle part is equipped with the static pressure detecting device staggered relatively with the dynamic pressure detecting device in the sensor holder baroport.
Dynamic pressure detecting device the place ahead in dynamic pressure detects conduction hole is equipped with anti-dirt fence.
The static pressure detection draining hole that static pressure detects conduction hole is tubaeform.
The present invention is because directly bottom the front of sensor holder (with respect to the thing direction of motion of travelling waterborne), be processed with the static pressure that runs through sensor holder under the dynamic pressure detection conduction hole and detect conduction hole, current will detect the conduction hole level from static pressure and pass, thereby changed traditional in the perforate of the side of drainage seat, the drainage way of back perforate or bottom opening, and the present invention is processed with the sensor holder baroport on the middle-end top that static pressure detects conduction hole, current are after static pressure detects the certain throttling guiding of conduction hole generation like this, again upwards by pressing the static pressure detecting device behind the sensor holder baroport, current become slow rising by original flowing fast, not only reduced direct impact to the static pressure detecting device, also directly sensor holder baroport and the extraneous water flow field that changes are separated, by bubble, vortex, circulation, eddy current, the additonal pressure of generations such as wake flow can not be conducted to the static pressure detecting device by the sensor holder baroport, the current (its Reynolds number is much larger than the critical number that produces turbulent flow as calculated) of drainage seat baroport of flowing through are laminar flows, therefore the static pressure detecting device is detected is the static pressure that the true depth of water produces, thereby avoided being subjected to the interference of changeable water flow field to guarantee the precision that navigational speed measuring instrument is measured, improved the sea keeping quality of navigational speed measuring instrument.
Therefore, the extracting method of differential pressure type navigational speed measuring instrument static pressure of the present invention can avoid static pressure P2 to be subjected to the influence of the additonal pressure (being that the hydrology changes) that produces from factors such as underwater 3 D space such as circulation, eddy current, wake flows effectively, make the extraction precision of static pressure be improved, thereby improve the measuring accuracy of navigational speed measuring instrument with respect to water velocity, performance is also more stable; Sea keeping quality, signal Processing that static pressure extraction element of the present invention has the extraction precision that can improve static pressure, improve navigational speed measuring instrument simply, need not set up influence, the advantage of simple structure that complex model is eliminated turbulent flow, and the present invention can be applicable to the travel measurement of thing speed through water of any water surface.
Description of drawings
Fig. 1 is the structural representation that the static pressure extraction element is connected with navigational speed measuring instrument.
1, handle, 2, connecting rod, 3, the kinematic axis shell, 4, sensor holder, 5, the drainage seat, 6, dynamic pressure detects conduction hole, 7, dynamic pressure detecting device, 8, the sensor holder baroport, 9, the static pressure detecting device, 10, circuit board, 11, static pressure detects draining hole, and 12, static pressure detects conduction hole, 13, static port, 14, anti-dirt fence.
Embodiment
Below in conjunction with embodiment and contrast accompanying drawing the present invention is described in further detail.
A kind of extracting method of differential pressure type navigational speed measuring instrument static pressure:
A, navigational speed measuring instrument is installed on the thing that travels waterborne, the dynamic pressure on the sensor holder 4 detects conduction hole 6 and static pressure and detects conduction hole 12 and all can automatically face toward travel direction;
B, current pass the anti-dirt fence 14 in the dynamic pressure detection conduction hole 6, the surface of horizontal impact dynamic pressure detecting device 7, dynamic pressure detecting device 7 will detect the dynamic pressure P1 that comprises static pressure that the thing that travels waterborne head-on produces at the volley, and dynamic pressure P1 is converted to the dynamic pressure electric signal flows to CPU on the circuit board 10;
C, current level are passed sensor holder 4 and are detected conduction hole 12 with respect to the positive bottom of the thing direction of motion of travelling waterborne, the static pressure that runs through sensor holder 4 that dynamic pressure detects conduction hole 6 belows, and upwards arrive static port 13 along sensor holder baroport 8, press static pressure detecting device 9, static pressure detecting device 9 will detect the static pressure P2 that is produced by the depth of water, and stable static pressure P2 is converted to the static pressure electric signal flows to CPU on the circuit board 10;
D, CPU subtract each other dynamic pressure electric signal and the static pressure electric signal that obtains, and offset static pressure, and CPU will subtract each other the data that obtain again to be handled and obtain the speed of a ship or plane.
A kind of static pressure extraction element, form by sensor holder 4 that is connected as a single entity and drainage seat 5, sensor holder 4 adopts with the kinematic axis shell 3 of the navigational speed measuring instrument that is positioned at sensor holder 4 tops and is threaded, be processed with dynamic pressure at sensor holder 4 with respect to front upper of travelling thing direction of motion waterborne and detect conduction hole 6, middle-end top in dynamic pressure detects conduction hole 6 is equipped with dynamic pressure detecting device 7, positive bottom at sensor holder 4, be processed with the static pressure that runs through sensor holder 4 under the dynamic pressure detection conduction hole 6 and detect conduction hole 12, middle-end top in sensor holder 4 is processed with to be detected conduction hole 12 with static pressure and communicates and vertical sensor holder baroport 8, and static port 13 places in the middle part of sensor holder baroport 8 in are equipped with the static pressure detecting device 9 staggered relatively with dynamic pressure detecting device 7.
The place ahead of dynamic pressure detecting device 7 in dynamic pressure detects conduction hole 6 is equipped with anti-dirt fence 14.
The static pressure detection draining hole 11 that static pressure detects conduction hole 12 is tubaeform.
Principle of work:
When the thing that travels waterborne began to travel, the hydrology of navigational speed measuring instrument periphery changed, and caused the direction of water flow field uncertain, and three dimensions produces a lot of unnecessary bubbles, vortex, circulation, eddy current, wake flow etc. under water.
A, when not adding the static pressure extraction element, directly conduct to static pressure detecting device 9 by sensor holder baroport 8 by the additonal pressure that bubble, vortex, circulation, eddy current, wake flow etc. produce, cause the static pressure measurement error.
B, after adding this static pressure extraction element, directly sensor holder baroport 8 and the extraneous water flow field that changes are separated, by bubble, vortex, circulation, eddy current, the additonal pressure that wake flow etc. produce can not directly be given static pressure detecting device 9 by 8 conduction of sensor holder baroport, current detect draining hole 11 through static pressure, drainage seat baroport 12 produces certain throttling guiding back by sensor holder baroport 8, the current (its Reynolds number is much larger than the critical number that produces turbulent flow as calculated) of drainage seat baroport 12 of flowing through are laminar flows, therefore static pressure detecting device 9 is detected is the static pressure that the true depth of water produces, thereby avoided being subjected to the interference of changeable water flow field to guarantee the precision that navigational speed measuring instrument is measured, improved the sea keeping quality of navigational speed measuring instrument.
Claims (4)
1. the extracting method of a differential pressure type navigational speed measuring instrument static pressure is characterized in that:
A, navigational speed measuring instrument is installed on the thing that travels waterborne, the dynamic pressure on the sensor holder (4) detects conduction hole (6) and static pressure detection conduction hole (12) all can automatically face toward travel direction;
B, current pass dynamic pressure and detect the interior anti-dirt fence (14) of conduction hole (6), the surface of horizontal impact dynamic pressure detecting device (7), dynamic pressure detecting device (7) will detect the dynamic pressure P1 that comprises static pressure that the thing that travels waterborne head-on produces at the volley, and dynamic pressure P1 is converted to the dynamic pressure electric signal flows to CPU on the circuit board (10);
C, current level are passed sensor holder (4) detects conduction hole (6) below with respect to positive bottom, the dynamic pressure of the thing direction of motion of the travelling waterborne static pressure detection conduction hole (12) that runs through sensor holder (4), and upwards arrive static port (13) along sensor holder baroport (8), press static pressure detecting device (9), static pressure detecting device (9) will detect the static pressure P2 that is produced by the depth of water, and stable static pressure P2 is converted to the static pressure electric signal flows to CPU on the circuit board (10);
D, CPU subtract each other dynamic pressure electric signal and the static pressure electric signal that obtains, and offset static pressure, and CPU will subtract each other the data that obtain again to be handled and obtain the speed of a ship or plane.
2. static pressure extraction element, it is characterized in that: form by sensor holder that is connected as a single entity (4) and drainage seat (5), sensor holder (4) adopts with the kinematic axis shell (3) of the navigational speed measuring instrument that is positioned at sensor holder (4) top and is threaded, be processed with dynamic pressure at sensor holder (4) with respect to front upper of travelling thing direction of motion waterborne and detect conduction hole (6), middle-end top in dynamic pressure detects conduction hole (6) is equipped with dynamic pressure detecting device (7), positive bottom at sensor holder (4), be processed with the static pressure that runs through sensor holder (4) under the dynamic pressure detection conduction hole (6) and detect conduction hole (12), middle-end top in sensor holder (4) is processed with static pressure detection conduction hole (12) and communicates and vertical sensor holder baroport (8), and the static port (13) at middle part locates to be equipped with the static pressure detecting device (9) staggered relatively with dynamic pressure detecting device (7) in sensor holder baroport (8).
3. static pressure extraction element as claimed in claim 2 is characterized in that: the place ahead of the dynamic pressure detecting device (7) in dynamic pressure detects conduction hole (6) is equipped with anti-dirt fence (14).
4. as claim 3 or 4 described static pressure extraction elements, it is characterized in that: the static pressure that static pressure detects conduction hole (12) detects draining hole (11) for tubaeform.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN 201010207429 CN101893644A (en) | 2010-06-23 | 2010-06-23 | Extraction method and extraction device of static pressure of differential pressure type navigational speed measuring instrument |
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| CN 201010207429 CN101893644A (en) | 2010-06-23 | 2010-06-23 | Extraction method and extraction device of static pressure of differential pressure type navigational speed measuring instrument |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102841216A (en) * | 2012-09-26 | 2012-12-26 | 中国船舶重工集团公司第七一〇研究所 | Portable speed measuring device for ship |
| CN109541255A (en) * | 2018-11-29 | 2019-03-29 | 中国船舶重工集团公司第七0七研究所九江分部 | A kind of integrated impulse formula water speed sensor to test the speed for amphibious vehicle to water |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2108927U (en) * | 1991-12-29 | 1992-07-01 | 南昌市惠通电工厂 | Differential pressure flow and velocity sensor |
| CN101551402A (en) * | 2009-03-20 | 2009-10-07 | 南京吉纳波环境测控有限公司 | Pitot tube used for fixing continuous and automatic monitoring system of pollution source fume |
| CN201373882Y (en) * | 2009-03-30 | 2009-12-30 | 江西省智成测控技术研究所有限责任公司 | Water velocimeter |
| CN201716324U (en) * | 2010-06-23 | 2011-01-19 | 江西省智成测控技术研究所有限责任公司 | Static pressure extraction device of differential pressure type marine speedometer |
-
2010
- 2010-06-23 CN CN 201010207429 patent/CN101893644A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2108927U (en) * | 1991-12-29 | 1992-07-01 | 南昌市惠通电工厂 | Differential pressure flow and velocity sensor |
| CN101551402A (en) * | 2009-03-20 | 2009-10-07 | 南京吉纳波环境测控有限公司 | Pitot tube used for fixing continuous and automatic monitoring system of pollution source fume |
| CN201373882Y (en) * | 2009-03-30 | 2009-12-30 | 江西省智成测控技术研究所有限责任公司 | Water velocimeter |
| CN201716324U (en) * | 2010-06-23 | 2011-01-19 | 江西省智成测控技术研究所有限责任公司 | Static pressure extraction device of differential pressure type marine speedometer |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102841216A (en) * | 2012-09-26 | 2012-12-26 | 中国船舶重工集团公司第七一〇研究所 | Portable speed measuring device for ship |
| CN102841216B (en) * | 2012-09-26 | 2014-07-02 | 中国船舶重工集团公司第七一〇研究所 | Portable speed measuring device for ship |
| CN109541255A (en) * | 2018-11-29 | 2019-03-29 | 中国船舶重工集团公司第七0七研究所九江分部 | A kind of integrated impulse formula water speed sensor to test the speed for amphibious vehicle to water |
| CN109541255B (en) * | 2018-11-29 | 2021-01-08 | 中国船舶重工集团公司第七0七研究所九江分部 | Integrated pressure-guiding type water speed sensor for speed measurement of amphibious vehicle on water |
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Open date: 20101124 |