CN103727985A - Flexible vortex street probe based on triaxial accelerometer - Google Patents
Flexible vortex street probe based on triaxial accelerometer Download PDFInfo
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- CN103727985A CN103727985A CN201310694919.0A CN201310694919A CN103727985A CN 103727985 A CN103727985 A CN 103727985A CN 201310694919 A CN201310694919 A CN 201310694919A CN 103727985 A CN103727985 A CN 103727985A
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Abstract
The invention belongs to the technical field of flow measuring and relates to a flexible vortex street probe based on a triaxial accelerometer. The flexible vortex street probe comprises a columnar shell with a flange piece. The flexible vortex street probe is characterized in that the columnar shell is made of an elastic material and is hollow, the front portion of the columnar shell gradually thins to form an elastic flat pressing mouth, a three-dimensional acceleration sensor is fixed on the pressing mouth, the three-dimensional acceleration sensor is triaxial, the X axis is a vibration sensitive axis and is along the direction of the central axis of the columnar shell, the Z axis is a vortex street sensitive axis and is perpendicular to a plane of the pressing mouth, the Y axis is an auxiliary measuring axis, and a plane formed by the X axis and the Y axis is parallel to the plane of the pressing mouth. The flexible vortex street probe can differentiate vortex street signals and interference signals better and can improve measuring accuracy of a vortex street flowmeter.
Description
Technical field
The invention belongs to flow measurement technology field, relate to a kind of vortex street probe that can simultaneously measure vortex signal and undesired signal and then raising interference free performance.
Background technology
Vortex shedding flow meter is a kind of flowmeter based on fluid oscillation principle, and it vibrates to external world, the flow state of fluid is responsive especially.The impact that vibration is measured vortex shedding flow meter:
(1) vortex shedding flow meter instrument coefficient error becomes greatly with the increase of vibration acceleration, and resistance to shock is poor.
(2) under identical vibration acceleration condition, no matter how vibration frequency changes, and vortex shedding flow meter instrument coefficient error increases and has the trend of reducing with flow, and under low discharge, vibration effect is maximum.
(3), under identical vibration acceleration condition, vortex shedding flow meter instrument coefficient error increases and reduces with vibration frequency.
(4) horizontal vibration direction is than vertical direction, and vortex shedding flow meter instrument coefficient error is less, and resistance to shock is better.
Existing experimental analysis knows, the common vortex shedding flow meter of stress-type only can normally be worked when not considering lower limit flow velocity under pipe vibration acceleration is less than 0.1g.The vibration of industry spot is more complicated, eliminates vibration more difficult.
The stress-type vortex street probe made from piezoelectric element is most widely used.Tradition probe only has a pair of piezoelectric element, the signal aliasing of collection to have vortex signal and the vibration interference signal in same direction.Can be described as One-dimensional Testing Signal.There is patent (as " three-wire common-ground vortex street probe ") to propose to use two pairs of piezoelectric elements to be symmetrically distributed in the upper and lower side of neutral axis.Object is that lower end piezoelectric element detects vortex street and vibration mixed signal, and upper end piezoelectric element detects vibration signal, but upper end piezoelectric element also can detect the vortex signal of some strength in practice.Meanwhile, two pairs of piezoelectric elements detect equidirectional stress signal, say in essence or one-dimensional signal.In addition, two groups of signals come source position different, in the information such as amplitude phase place, lack direct correlativity.
Summary of the invention
For above problem, the object of the invention is to propose a kind ofly can distinguish better vortex signal and undesired signal, can improve the vortex street probe of vortex shedding flow meter measuring accuracy.The present invention combines three-dimensional acceleration transducer with vortex street probe, make output signal be promoted to three-dimensional by one dimension, and when vortex street and effect of vibration are when probe is upper, disalignment is different to output response, utilizes response difference to distinguish vortex signal and undesired signal.
For achieving the above object, the present invention takes following technical scheme:
A kind of flexible vortex street probe based on three axis accelerometer, comprise the cylindrical shell with flange plate, it is characterized in that, cylindrical shell is that resilient material is made, hollow, the front portion attenuation that is tapered, form the pressure mouth of flexible flat, on pressure mouth, be fixed with three dimension acceleration sensor, described three dimension acceleration sensor has three axially, wherein X-axis is vibration sensing axle, Z axis is vortex street sensitive axes, Y-axis is subsidiary axle, X-direction is the central axis direction along cylindrical shell 2, Z axis is perpendicular to pressure mouth plane, plane and pressure mouth plane parallel that X-axis and Y-axis form.
As preferred implementation, when carrying out pipeline flow measurement, described probe vertical inserts pipe interior, adjusts pressure mouth plane and makes it parallel with flow field direction.
The present invention is owing to taking above technical scheme, and it has the following advantages:
The present invention proposes a kind of input probe based on three axis accelerometer.There is compared to existing technology advantage:
The present invention is the vortex street frequency detecting probe based on three axis accelerometer.Miniature acceleration sensor is encapsulated in to vortex street probe end direct feeling vortex signal, output vortex street, vibration, perpendicular to the signal of three dimensions of vortex street and direction of vibration.There is deformation because vortex street impacts and produce displacement in probe end, thereby acceleration change detected.The acceleration change that this side up, can degree of being accelerated sensor vortex street stress axis sensitivity identify.Vibration conducts along connecting rod, can be by the identification of vibrating shaft sensitivity.Than traditional stress-type probe, can only detect the signal on vortex street impact direction, signal is promoted to three-dimensional by one dimension.Disalignment is to different with effect of vibration sensitivity to vortex street, responds also not identically, utilizes three dimensional signal output difference to distinguish vortex signal and undesired signal.
Accompanying drawing explanation
Fig. 1 is furnished with the probe side view that the present invention is combined with acceleration transducer.
Fig. 2 (a) (b) (c) is respectively X under impact shock, Y and tri-voltage magnitude signals of axially exporting respectively of Z.
Fig. 3 (a) (b) (c) is X under periodic vibration, Y and tri-voltage magnitude signals of axially exporting respectively of Z.
Embodiment
Below in conjunction with drawings and Examples, to of the present invention, be described in detail.
The present invention is the vortex street detection probe (Fig. 1) based on three axis accelerometer.Flexible vortex street probe based on three axis accelerometer of the present invention, comprise the cylindrical shell 2 with flange plate 3, cylindrical shell 2 is made for resilient material, hollow, the front portion attenuation that is tapered, form the pressure mouth 4 of flexible flat, at the pressure mouth 4 encapsulation acceleration transducers 1 of cylindrical shell bottom, the signal wire of acceleration transducer is drawn from the middle part of cylindrical shell 2.When vortex street impact probe bottom, can make lower sensor 1 together swing with vortex.See that when Fig. 1 dotted portion is stressed, end is crooked.Three dimension acceleration sensor 1 has three axially, wherein X-axis is vibration sensing axle, and Z axis is vortex street sensitive axes, and Y-axis is subsidiary axle, X-direction is the central axis direction along cylindrical shell 2, Z axis is perpendicular to pressure mouth plane, and plane and pressure mouth plane parallel that X-axis and Y-axis form, when carrying out pipeline flow measurement, during installation, probe vertical insert pipe interior, adjust pressure mouth plane and make it parallel with flow field direction, the acceleration transducer 1 of the end of popping one's head in is positioned at pipeline center.
This probe carries out experiment measuring on airshed shaking table.At 19m
3under/h flow 0Hz Vibration Condition, collection signal is exported and is carried out power spectral-density analysis.X and Y-axis do not detect vortex signal, show and in collection of illustrative plates, there is no obvious power peak.And Z axis has an obvious power spectrum spike when about 400Hz frequency, what this frequency was corresponding is exactly vortex signal frequency.
This probe carries out vibration experiment measurement on shaking table.At 0m
3under/h flow attack vibration condition, three axial output signals are collected to time domain voltage signal (as Fig. 2).Can find out that three axial impact signals have certain response, respond as decay concussion.Contrast finds that disalignment is not to identical in response amplitude, the rate of decay.Contrast as following table:
| Axially | Peak-to-peak value (mV) |
| X | 850 |
| Y | 450 |
| Z | 290 |
X-axis amplitude is maximum, and Z axis amplitude is minimum.Adjusting time X, Y-axis are longer, and Z axis is the shortest.
At 0m
3under/h flow 35Hz-0.1g sinusoidal vibration, three axial output signals are collected to voltage signal (as Fig. 3).Z axis does not detect periodic vibration signal, and X-axis Y-axis detects periodic vibration signal, and wherein X-axis signal intensity is greater than Y-axis.
Claims (2)
1. the flexible vortex street probe based on three axis accelerometer, comprises the cylindrical shell with flange plate, it is characterized in that, cylindrical shell is that resilient material is made, and is hollow, the front portion attenuation that is tapered, the pressure mouth that forms flexible flat is fixed with three dimension acceleration sensor on pressure mouth.Described three dimension acceleration sensor has three axially: X-axis is vibration sensing axle, Z axis is vortex street sensitive axes, and Y-axis is subsidiary axle, and X-direction is the central axis direction along cylindrical shell 2, Z axis is perpendicular to pressure mouth plane, plane and pressure mouth plane parallel that X-axis and Y-axis form.
2. vortex street probe according to claim 1, is characterized in that, when carrying out pipeline flow measurement, described probe vertical inserts pipe interior, adjusts pressure mouth plane and makes it parallel with flow field direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201310694919.0A CN103727985A (en) | 2013-12-11 | 2013-12-11 | Flexible vortex street probe based on triaxial accelerometer |
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| CN201310694919.0A CN103727985A (en) | 2013-12-11 | 2013-12-11 | Flexible vortex street probe based on triaxial accelerometer |
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| CN103727985A true CN103727985A (en) | 2014-04-16 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109341786A (en) * | 2018-12-04 | 2019-02-15 | 东北林业大学 | A kind of automobile air-flow sensor |
| CN111412957A (en) * | 2020-03-27 | 2020-07-14 | 天津大学 | Vortex street signal detection method based on acceleration measurement |
| CN111412956A (en) * | 2020-03-27 | 2020-07-14 | 天津大学 | Vortex street probe based on acceleration measurement |
| CN112146718A (en) * | 2020-08-19 | 2020-12-29 | 天津大学 | Mass flow measuring method based on vortex street sensor |
| CN113405621A (en) * | 2021-06-28 | 2021-09-17 | 四川奥达测控装置有限公司 | Novel vortex street sensor and flow testing method thereof |
| CN113551721A (en) * | 2020-04-23 | 2021-10-26 | 中国石油化工股份有限公司 | Vortex street flowmeter and flow detection method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1192529A (en) * | 1996-11-08 | 1998-09-09 | 安德雷斯和霍瑟·弗罗泰克有限公司 | Vortex flow sensor |
| US6298734B1 (en) * | 1999-03-17 | 2001-10-09 | Vortek Instruments Llc | Rocker style sensor system for use in a vortex shedding flowmeter |
| CN101979964A (en) * | 2010-09-14 | 2011-02-23 | 涂强 | Vortex shedding flowmeter capable of changing sensor online |
| CN102680030A (en) * | 2011-01-31 | 2012-09-19 | 克洛纳测量技术有限公司 | Vortex flowmeter |
-
2013
- 2013-12-11 CN CN201310694919.0A patent/CN103727985A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1192529A (en) * | 1996-11-08 | 1998-09-09 | 安德雷斯和霍瑟·弗罗泰克有限公司 | Vortex flow sensor |
| US6298734B1 (en) * | 1999-03-17 | 2001-10-09 | Vortek Instruments Llc | Rocker style sensor system for use in a vortex shedding flowmeter |
| CN101979964A (en) * | 2010-09-14 | 2011-02-23 | 涂强 | Vortex shedding flowmeter capable of changing sensor online |
| CN102680030A (en) * | 2011-01-31 | 2012-09-19 | 克洛纳测量技术有限公司 | Vortex flowmeter |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109341786A (en) * | 2018-12-04 | 2019-02-15 | 东北林业大学 | A kind of automobile air-flow sensor |
| CN109341786B (en) * | 2018-12-04 | 2023-10-27 | 东北林业大学 | Automobile air flow sensor |
| CN111412957A (en) * | 2020-03-27 | 2020-07-14 | 天津大学 | Vortex street signal detection method based on acceleration measurement |
| CN111412956A (en) * | 2020-03-27 | 2020-07-14 | 天津大学 | Vortex street probe based on acceleration measurement |
| CN113551721A (en) * | 2020-04-23 | 2021-10-26 | 中国石油化工股份有限公司 | Vortex street flowmeter and flow detection method thereof |
| CN112146718A (en) * | 2020-08-19 | 2020-12-29 | 天津大学 | Mass flow measuring method based on vortex street sensor |
| CN113405621A (en) * | 2021-06-28 | 2021-09-17 | 四川奥达测控装置有限公司 | Novel vortex street sensor and flow testing method thereof |
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Application publication date: 20140416 |