CN104330149A - Hydropower station set vibration measurement monitoring method - Google Patents
Hydropower station set vibration measurement monitoring method Download PDFInfo
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- CN104330149A CN104330149A CN201410561597.7A CN201410561597A CN104330149A CN 104330149 A CN104330149 A CN 104330149A CN 201410561597 A CN201410561597 A CN 201410561597A CN 104330149 A CN104330149 A CN 104330149A
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Abstract
The invention relates to the hydropower station set detection field, and particularly relates to a hydropower station set vibration measurement monitoring method. A piezoelectric acceleration sensor and a pre processing module are provided. A protection data acquisition device finishes A/D data acquisition and is in charge of suppressing sensor resonance signals at the same time; and a low-noise and low-attenuation cable is adopted between the piezoelectric acceleration sensor and the pre processing module, so as to ensure electric signals not to bring attenuation and larger noise in the transmission process. When the piezoelectric acceleration sensor is applied to hydropower station set vibration measurement, features of high sensitivity, low noise, low frequency response and the like are provided, voltage signals outputted by low-frequency small-amplitude vibration signals can be ensured to be strong enough, true low-frequency small-amplitude acceleration signals can be ensured not to be overwhelmed by the noise signals, vibration signals as low as 0.5Hz can be detected, and problems of distortion, or failure, poor precision and the like of the original inertial low-frequency vibration sensor measurement signals are solved.
Description
technical field
The present invention relates to a kind of Hydropower Plant detection field, i.e. Hydropower Plant vibration survey monitoring method.
Background technology
In the prior art, at present, conventional turbine-generator units structural vibration fields of measurement mainly adopts magneto-electric (moving-coil type) inertia low-frequency shock transducer sensor at home.The minimum response frequency of this sensor can reach about 0.5Hz, and the highest response frequency can reach more than 200Hz, is widely used in the absolute vibration displacement measurement of the positions such as the frame of hydro-generating Unit, top cover.This kind of sensor can obtain frame, the minimum frequency signal reaching 0.5Hz in top cover place, but due to design concept sex chromosome mosaicism, its long term reliability, stability are difficult to solve always, the distortion of ubiquity measuring-signal or the problem such as inefficacy, low precision, be applied to unit vibration on-line monitoring replacing sensor frequent.
For this magneto-electric (moving-coil type) low-frequency shock transducer, deposit defect in the following areas:
1, sensor mechanism thrashing problems
Owing to being provided with the movable mechanical hook-up such as inertial mass, coil and spring damping in the type sensor, in long-time running, extremely easily occur mechanical fatigue and the phenomenon such as stuck, cause measuring and lost efficacy, sensor life-time is short.
2, the measuring error caused due to the resonance of earthquake type wave detector and compensating circuit Problem of Failure
The core component of this sensor is the earthquake type wave detector of natural frequency between 10Hz-30Hz of.And select the natural frequency of this frequency range, the generation of following problem may be caused:
(1) there is a large amount of vibration signals between 10Hz-30Hz in the indeed vibrations of turbine-generator units, easily cause the resonance of seismoreceiver, cause measuring inaccurate.
(2) under some operating condition condition of turbine-generator units, there is impact phenomenon to frame, top cover in fluid, this impact can cause the resonance of wave detector; When after wave detector resonance, the output of this sensor not only cannot ensure the degree of accuracy measured, and have also been introduced the vibration signal of false frequency, simultaneously, this resonance signal is amplified by the frequency end compensating circuit of sensor, extremely easily causes the inefficacy of circuit, thus causes the insincere of measuring-signal.
3, the type sensor has directivity, and strict differentiation horizontal vibration sensor and vertical vibration sensor, be respectively used to the vibration survey of horizontal direction and vertical direction, Horizonal Disturbing is larger.
Above reason is the reason that there is Signal Fail, less stable in causing magneto-electric inertia low-frequency shock transducer to use at the scene in a large number.Therefore the sensor of the type, cannot require to apply in the on-line monitoring of high reliability and vibration throw protection system.
Summary of the invention
The object of the invention is to provide for above-mentioned deficiency a kind of reliable measuring data, accuracy high, the Hydropower Plant vibration survey monitoring method of Be very effective.
Technical solution of the present invention is: Hydropower Plant vibration survey monitoring method, comprising:
Piezoelectric acceleration transducer, is placed on Hydropower Plant frame or top cover.
Pre-process module; be placed in piezoelectric acceleration transducer rear end; be vibration displacement signal by the data-signal of piezoelectric acceleration transducer through twice hardware integration, finally output to runout protected data harvester and complete A/D data acquisition, be responsible for suppressing sensor resonance signal simultaneously.
Low noise, low attenuating cable is adopted, to ensure that electric signal does not bring decay and larger noise in transmitting procedure between piezoelectric acceleration transducer and pre-process module.
Described pre-process module comprises:
Every straight low-resistance link, be a high-pass filtering link, in order to remove the DC signal component of acceleration transducer output and the interfering noise signal lower than 0.5Hz.
The first order and second level integral element: vibration acceleration signal integration is vibration velocity signal by the integral element being a band rejector and corrector.
Power module: adopting high stability, low ripple linear power supply module, after pi type filter, is each module and sensor power.
Highly sensitive sensor is adopted to be to ensure that the voltage signal that low frequency small magnitude vibration signal exports can be enough strong, can be detected by the pre-process module of rear end, low noise is then that low-frequency response characteristic then ensures that the vibration signal of the low 0.5Hz of reaching can be detected by sensor in order to ensure that the noise signal that sensor exports can not flood real low frequency small magnitude acceleration signal; The function of local mounted pre-process module mainly degree of will speed up sensor data-signal through twice hardware integration be vibration displacement signal; finally output to runout protected data harvester and complete A/D data acquisition, fore-lying device is responsible for suppressing sensor resonance signal simultaneously.Low noise, low attenuating cable is adopted, to ensure that electric signal does not bring decay and larger noise in transmitting procedure between acceleration transducer and pre-process module.
Adopt the acceleration transducer of piezoelectric type principle to measure low-frequency vibration signal and there is following inherent advantage:
(1) sensor internal is without the movable device such as spring, coil, can not cause the stuck and mechanical fatigue problem of the coil that causes due to mechanical movable part.
(2) resonance frequency of piezoelectric transducer can up to more than 10000Hz, and far away higher than the effective vibration frequency of turbine-generator units frame, therefore normal vibration can not cause the resonance of acceleration transducer.
(3) the non-directional requirement of sensor, can be applicable to the vibration survey in level, vertical even 45 degree of directions, Horizonal Disturbing is less simultaneously.
(4) piezoelectric acceleration transducer (especially import acceleration transducer) is compared with magneto-electric inertia low-frequency shock transducer, in reliability, stability, has incomparable advantage in the long-life.
Therefore, piezoelectric acceleration transducer is selected to have natural technical advantage in vibration of hydrogenerator set is measured.
Advantage of the present invention is: 1, piezoelectric acceleration transducer is applied to Hydraulic Power Unit vibration survey, it has the features such as high sensitivity, low noise, low-frequency response, ensures that the voltage signal that low frequency small magnitude vibration signal exports is enough strong, noise signal can not flood real low frequency small magnitude acceleration signal, can detect the low vibration signal reaching 0.5Hz; Solve original inertia low-frequency shock transducer measuring-signal distortion or the problem such as inefficacy, low precision.2, piezoelectric acceleration transducer is applied to Hydraulic Power Unit vibration survey, sensor stability is good, the life-span is long, reliability, the accuracy of measurement data are high, and sensor mounting condition is unrestricted, compatible good.3, acceleration transducer substitutes magnetoelectric velocity transducer will have good promotion prospect for the on-line monitoring vibration survey of conventional hydraulic unit.
Below in conjunction with accompanying drawing, embodiments of the present invention are described in further detail.
Accompanying drawing explanation
Fig. 1 is Signal-regulated kinase block diagram in the present invention.
Embodiment
See Fig. 1, Hydropower Plant vibration survey monitoring method, comprising: piezoelectric acceleration transducer, pre-process module, and protected data harvester completes A/D data acquisition, is responsible for suppressing sensor resonance signal simultaneously; Low noise, low attenuating cable is adopted, to ensure that electric signal does not bring decay and larger noise in transmitting procedure between piezoelectric acceleration transducer and pre-process module.
The each link function declaration of Signal-regulated kinase:
Every straight low-resistance link: operational amplifier.This is a high-pass filtering link, and corner frequency designs at 0.5Hz, in order to remove the DC signal component of acceleration transducer output and the interfering noise signal lower than 0.5Hz.
The first order and second level integral element: operational amplifier.This is the integral element of a band rejector and corrector, is vibration velocity signal by vibration acceleration signal integration.
Power module: adopting high stability, low ripple linear power supply module, after pi type filter, is each module and sensor power.
Piezoelectric acceleration transducer design parameter requires as follows:
A. sensor type: piezoelectric acceleration transducer.
B. frequency response: 0.17-10000Hz(± 3dB).
C. resonance frequency: 16kHz.
D. sensitivity: 500 mV/g.
E. maximum detection range: ± 10g.
F. amplitude nonlinearity: ± 1 %.
G. power supply: 18 to 28 VDC.
H. serviceability temperature scope :-54 to+121 DEG C.
I. shock resistance: 2500 g pk.
J. degree of protection: IP68.
K. joint: the military joint of top 2 pin MIL-C-5015.
L. output noise (10Hz): 3 μ g √ Hz.
Output noise (100Hz): 0.7 μ g √ Hz.
Output noise (1000Hz): 0.5 μ g √ Hz.
Wherein, the response frequency of 0.17-10000Hz can meet the vibration survey of turbine-generator units 0.5Hz-1000Hz; The sensitivity of 500 mV/g then ensure that low frequency, small magnitude vibration acceleration has enough voltage resolutions; And 3 μ g below √ Hz(10Hz) noise level ensure there is sufficiently high signal to noise ratio (S/N ratio) at low frequency small magnitude vibration signal, the vibration acceleration that such as frequency is 1Hz, amplitude is 10 μm is 40 μ g, and the output noise of this sensing is not more than 3 μ g, therefore indeed vibrations signal is much larger than noise signal.Up to the resonance frequency of 16kHz, then ensure that normal hydraulic generator machine vibration (0.5Hz-1000Hz) can not cause the resonance of sensor.
Signal-regulated kinase specific targets are as follows:
A. model: ASC-30.
B. manufacturing firm: first auspicious news in Beijing.
C. frequency response: 0.5Hz-1000Hz(± 3dB).
D. input signal types: vibration acceleration (voltage).
E. type is outputed signal: vibration displacement (voltage).
F. with the overall sensitivity of acceleration transducer: 8mV/ μm.
G. maximum detection range: ± 1000 μm.
H. amplitude nonlinearity: ± 1 %.
I. power supply: ± 24 VDC.
The sensor passage number that J. can simultaneously process: 3 tunnels.
Claims (1)
1. a Hydropower Plant vibration survey monitoring method, is characterized in that comprising:
Piezoelectric acceleration transducer, is placed on Hydropower Plant frame or top cover;
Pre-process module, be placed in piezoelectric acceleration transducer rear end, be vibration displacement signal by the data-signal of piezoelectric acceleration transducer through twice hardware integration, finally output to runout protected data harvester and complete A/D data acquisition, be responsible for suppressing sensor resonance signal simultaneously;
Low noise, low attenuating cable is adopted, to ensure that electric signal does not bring decay and larger noise in transmitting procedure between piezoelectric acceleration transducer and pre-process module.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410561597.7A CN104330149A (en) | 2014-10-22 | 2014-10-22 | Hydropower station set vibration measurement monitoring method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410561597.7A CN104330149A (en) | 2014-10-22 | 2014-10-22 | Hydropower station set vibration measurement monitoring method |
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| CN104330149A true CN104330149A (en) | 2015-02-04 |
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| CN201410561597.7A Pending CN104330149A (en) | 2014-10-22 | 2014-10-22 | Hydropower station set vibration measurement monitoring method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104677483A (en) * | 2015-03-09 | 2015-06-03 | 北京中元瑞讯科技有限公司 | Digitized magneto-electric type low-frequency vibration sensor system |
| CN114814267A (en) * | 2021-12-31 | 2022-07-29 | 哈尔滨工业大学 | Low-frequency expanding circuit of magnetoelectric speed sensor and control method |
-
2014
- 2014-10-22 CN CN201410561597.7A patent/CN104330149A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104677483A (en) * | 2015-03-09 | 2015-06-03 | 北京中元瑞讯科技有限公司 | Digitized magneto-electric type low-frequency vibration sensor system |
| CN104677483B (en) * | 2015-03-09 | 2018-06-01 | 北京中元瑞讯科技有限公司 | A kind of digitized magneto-electric low-frequency shock transducer system |
| CN114814267A (en) * | 2021-12-31 | 2022-07-29 | 哈尔滨工业大学 | Low-frequency expanding circuit of magnetoelectric speed sensor and control method |
| CN114814267B (en) * | 2021-12-31 | 2023-01-24 | 哈尔滨工业大学 | Low-frequency expanding circuit of magnetoelectric speed sensor and control method |
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Application publication date: 20150204 |