CN102162769A - Fatigue multi-point wireless monitoring system of marine riser - Google Patents
Fatigue multi-point wireless monitoring system of marine riser Download PDFInfo
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Abstract
The invention relates to a fatigue multi-point wireless monitoring system of a marine riser. The system is composed of a parameter monitoring part, an information transmitting part and an information receiving part; the parameter monitoring part is composed of a plurality of sensors, is distributed at a plurality of monitoring points under the sea level along the marine riser and used for collecting the accelerated speed, strain and dip angle of the marine riser and ocean flow speed; and the information receiving part comprises an underwater sound transmitting transducer, a vertical underwater sound channel and an underwater receiving transducer; the information receiving part comprises a preposed analog amplification circuit board and an analog band pass filter with automatic gain control, wherein the preposed analog amplification circuit board comprises a triode amplification and operation amplification circuit, and the analog band pass filter comprises automatic gain control, band pass insulation and a postposed amplification circuit. According to the invention, a plurality of sensor groups are arranged along the marine riser, the multi-point real-time wireless fatigue monitoring performance can be realized, simultaneously the seal level information receiving part also can remotely control the underwater monitoring part, control the collecting time, sampling frequency and the like to reduce the energy consumption of the underwater part.
Description
Technical field
The present invention relates to the used marine riser equipment of marine oil and gas Exploration Domain, particularly about testing the multipoint wireless monitoring system of marine riser fatigue behaviour.
Background technology
Marine riser plays a significant role at the aspects such as heave movement of insulating sea water, guiding drilling tool, circulating fluid, compensation floating drilling vessel as the tie that connects subsea wellheads and operations offshore platform.In the profundal zone, marine riser is the unique equipment that connects sea platform and subsea wellheads, there are not other attachments, be in the top tension force marine riser in the environment of deep-sea (greater than 1500m), under the acting in conjunction of the multiple load such as vibration, drift and undulatory motion of ocean current, wave and sea platform, will produce alterante stress, bring out marine riser fatigue, reduce marine riser serviceable life, even fracture, exploitation causes heavy losses to deep-sea oil.
The marine riser fatigue monitoring is mainly monitored following several respects: 1, dynamic response and the mechanics attitude of marine riser under normal sea situation loading; 2, the dynamic response and the fatigue load of (ocean circulation, undercurrent, hurricane, typhoon) marine riser in the accident; 3, the true fatigue accumulation of marine riser member; 4, the residing environmental baseline of marine riser (ocean flow velocity); 5, the state at marine riser two ends globe joint place.
The motion of marine riser comprises vortex-induced vibration (VIV), inclination and skew etc., and VIV is the main cause that causes the marine riser fatigue failure.Marine riser up and down flexible joint corner is directly connected to the safety of drilling operation, and process such as the mud density and the environmental load etc. of these two parameters and drilling operation are closely related simultaneously, are the parameters of a variation, need be in drilling process real-time adjusting.At present main monitoring equipment has acceleration transducer etc.
The alterante stress of marine riser (moment of flexure) is directly connected to the work that marine riser whether can safety, and the stressed complexity in bottom-hinged district of marine riser is the emphasis position of strain measurement.Monitoring equipment mainly contains resistance strain gage, fiber-optic grating sensor, proving ring etc.
Ocean flow velocity, the measurement of flow velocity not only can be used for verifying the model and the theory of the Hydrodynamics Analysis of marine riser, and also drilling well production and the oil-field development for next step provides valuable data.Ocean flow velocity measuring equipment mainly contain acoustic Doppler fluid velocity profile instrument (Acoustic Doppler Current Profilers, ADCP).Its ultimate principle is a Doppler shift, and core technology is the doppler echo instantaneous Frequency Estimation.Monitoring mode has the boat-carrying formula, various ways such as pull-type, bottom-sitting type, self-tolerant, direct-reading.When being used for the marine riser fatigue monitoring, the ADCP working method mainly is a pull-type, on the platform of sea ADCP is rendered under water.The major defect of ADCP has: the investigation depth of ADCP depends on the power of acoustic sensor, and when increasing when fathoming, power and the volume of ADCP increase thereupon, and expense and power consumption sharply increase.Ocean current change in flow in deep-sea is slow in addition, only needs to select on different depth some positions to measure and gets final product, and measures whole ocean current section and becomes unnecessary.Above characteristics show, consider that from aspects such as expense, power consumption and cost performances ADCP not exclusively is applicable to the marine riser fatigue monitoring, needs new instrument to replace it.
Could be processed no matter which kind of parameter, data must be transferred to the data processing centre (DPC) of sea platform.Different with power supply mode according to data transmission, the marine riser monitoring system of using on the engineering mainly is divided into unit and real-time monitoring system two classes at present.The unit monitoring system is made up of datalogger and corresponding sensor, and wherein datalogger generally comprises center processing unit, analog to digital converter, data-carrier store and other auxiliary elements, and these elements all are encapsulated in the firm stainless steel casing.Datalogger and the required integrated use of sensor, unit monitoring system are used and are carried battery-powered the measurement, and data storage is measured end back data download from storer and analyzed to computing machine in storer.The unit monitoring system adopts bandage and clip to attach it on the marine riser, waits marine riser to reclaim the back reading of data or adopts ROV to fetch data and change electric battery.The cost of this method is low, but can not carry out real-time adjustment to correlation parameter according to the response of marine riser, the difficult point of passive type monitoring simultaneously is because the clock drift of the monitoring device of difference on the marine riser, the synchro measure difficulty, thereby be difficult to determine the relative position of difference, be applicable to drilling water-separation pipe, when the ROV sensor installation, because winch, ROV and marine riser three's relative motion brings many difficulty to fitting operation.
Real-time type monitoring system, power supply and data transmission realize by cable that all continuous monitoring is carried out in response to marine riser, and data are real-time transmitted to data processing centre (DPC).The circuit meeting of layout prolongs the angle of incidence under the marine riser, and may damage, and has limited depth of implements.Compare with the unit monitoring system, the structure of real-time monitoring system, installation and interface are all very complicated, and the cost height is not suitable for the monitoring of deep water riser.
Summary of the invention
Based on above-mentioned situation, the present invention proposes the tired multipoint wireless monitoring system of a kind of marine riser.The requirement of the deep-sea oil of combining closely exploitation, tired parameter monitoring method of primary study marine riser and the wireless Real-time Transmission of Monitoring Data, realization multiple spot multiparameter wireless is monitored in real time, breaks through the challenge that deepwater environment brings, and guarantees the safety of deep water riser.
For achieving the above object, the present invention takes following technical scheme: the tired multipoint wireless monitoring system of a kind of marine riser, by the parameter monitoring part, partial message transmission and message pick-up partly constitute, it is characterized in that: the parameter monitoring part is made of many covers sensor groups, be distributed under the sea on a plurality of monitoring points along marine riser, gather the acceleration of each place, monitoring point marine riser respectively, stress, inclination angle and ocean flow velocity, described many cover sensor groups are controlled by two CPU industrial computers, the CPU main frame comprises single-chip microcomputer, the CPU slave comprises digital signal processor, and communication is by the HPI parallel interface between two CPU; Partial message transmission comprises underwater sound transmitting transducer, vertical underwater acoustic channel, underwater sound receiving transducer; Message pick-up partly comprises preposition analog amplify circuit plate, has the analog band-pass filter of automatic gain control, preposition analog amplify circuit plate comprises transistor amplifier and operational amplification circuit, and the analog band-pass filter that has automatic gain control comprises automatic gain control, band is logical isolates and rearmounted amplifying circuit.
Described parameter monitoring part is gathered acceleration, stress, inclination angle and the ocean flow velocity of each place, monitoring point marine riser, and after various Monitoring Data are carried out information source coding, Error Correction of Coding, adopts frequency division multiplexing+time-multiplexed method that signal is modulated.
The sensor of measuring described acceleration adopts 3-axis acceleration sensor.
Adopt the 2SC2458NPN pipe to realize three grades of preposition amplifications in the described triode amplifying circuit.
Adopting TL082 to carry out computing in the described operational amplification circuit amplifies.
Automatic gain control loop is set, makes signal gain control within the specific limits, outside loop, connect an amplifying circuit after the bandpass filtering and make final output signal reach the A/D full scale by automatic gain control loop.
In the described automatic gain control loop, diode is connected in the feedback circuit.
Described bandpass filter is six rank elliptic filters, form by the oval low-pass filter of oval high pass in six rank and six rank, wherein six rank high passes are that second order VCVS Hi-pass filter connects quadravalence VCVS rejection filter composition, and six rank low-pass filters connect quadravalence VCVS rejection filter by second order VCVS low-pass filter and form.
The present invention is owing to take above technical scheme, it has the following advantages: 1, parameter monitoring of the present invention partly adopts many cover sensor groups to arrange along marine riser, measurement point is many, can carry out parameter measurements such as acceleration, stress, inclination angle, ocean flow velocity to the marine riser of the different depth of waters.2, the present invention is directed to the technical characterstic of the remote data transmission of ocean deepwater vertical channel, and according to the project demands of deepwater drilling marine riser monitoring, the information transmission system that adopts is the vertical underwater acoustic channel of deep water, carry out the parameter detecting and the data transmission of marine riser under water, rely on powered battery, therefore require low in energy consumption, reliability is high and the bit error rate is low.Its phase stability is fine, is well suited for using the method for phase coherence modulation, and multipath is expanded very I and do not remembered to ignore.3, the sea message pick-up partly adopts preposition amplification and automatic gain control bandpass filtering, can monitor the multiple tired parameter of each monitoring point under water by the multiple spot real-time radio, simultaneously, the sea message pick-up partly also can partly carry out remote control to underwater monitoring, control time interval, sample frequency of its information acquisition etc., to reduce the energy consumption of underwater portion, increase the service life.
Description of drawings
Fig. 1 is a system layout of the present invention;
Fig. 2 is a parameter monitoring section processes block diagram;
Fig. 3 is that partial message transmission is handled block diagram;
Fig. 4 is a message pick-up section processes block diagram;
Fig. 5 exchanges amplification principle figure;
Fig. 6 is the linear detection circuit schematic diagram;
Fig. 7 is linear detection circuit input and output waveform figure;
Fig. 8 is the integrator circuit schematic diagram;
Fig. 9 is direct current amplification principle figure;
Figure 10 is the automatic gain control circuit schematic diagram.
Embodiment
Be described in detail of the present invention below in conjunction with drawings and Examples.
The tired multipoint wireless monitoring system of marine riser involved in the present invention mainly is divided into three parts: parameter monitoring part, partial message transmission and message pick-up part, as shown in Figure 1, marine riser 1 one ends are connected on the subsea wellheads, and the other end is connected on the drilling platform; Parameter monitoring part is made of many covers sensor groups 2, is distributed under the sea on a plurality of monitoring points along marine riser 1, gathers the parameters such as acceleration, stress, inclination angle and ocean flow velocity of each place, monitoring point marine riser respectively; In the aboveground message pick-up part that is provided with.
The parameter monitoring part is gathered the parameters such as acceleration, stress, inclination angle and ocean flow velocity of each place, monitoring point marine riser, and after various Monitoring Data are carried out information source coding, Error Correction of Coding respectively, adopt frequency division multiplexing+time-multiplexed method that signal is modulated.Parameter monitoring part hardware circuit is with two CPU host-guest architectures designs, and main frame has comprised single-chip microcomputer, peripheral interface and power control circuit, finishes the work control of system and output function as a result; Slave comprises based on the data processing of DSP and coding output circuit, and its function mainly is that the Monitoring Data that each sensor groups collects is carried out digital processing and coding output.Communication is by HPI (host port interface) parallel interface between two CPU, transmission speed is the highest can to reach 50MB/s, the power consumption consumption of native system mainly concentrates on the DSP, and under the normal condition, have only single-chip microcomputer in work, when doing the big computing of operand such as FFT when needs, wake DSP up, DSP powers on and starts working, and such design has prolonged the time of system's underwater operation greatly, has saved the power consumption and the system cost of system.
Be positioned at the sensor groups 2 at each place, monitoring point, different according to function with effect, be divided into data acquisition module and data transmission module.As shown in Figure 2, the data parameters of collection has acceleration, marine riser inclination angle, bending stress and the ocean flow velocity of marine riser vortex-induced vibration.Each parameter is by corresponding sensor acquisition, and whole being operated under the control module that above-mentioned single-chip microcomputer constitutes worked.The data transmission module mainly is responsible for the coding and the modulation of each parameter information, after the parameter that acceleration transducer 21 (using 3-axis acceleration sensor among the present invention), strain gauge 22, flow sensor 23 and obliquity sensor 24 collect is carried out binary coding by single-chip microcomputer 25, become simulating signal through modulation circuit 26 treatment conversion, send to preamplifying circuit 27, matching network circuit 28, power expansion circuit 29 and handle successively, pass to transmitting transducer 31 at last and carry out information transmission.Single-chip microcomputer 25 is by 30 controls of DSP digital signal processor.
As shown in Figure 3, partial message transmission comprises underwater sound transmitting transducer 31, underwater acoustic channel 32, underwater sound receiving transducer 33.After analog information after the data transmission module will be modulated sends to transmitting transducer 31, transmitting transducer 31 becomes acoustical signal to be transferred near the receiving transducer 33 that is positioned at the sea by vertical underwater acoustic channel 32 analog signal conversion, and receiving transducer 33 is finished preprocessing functions such as the conditioning of the simulating signal that acoustic transducer is received and amplification.
As shown in Figure 4, the message pick-up part mainly comprises preposition analog amplify circuit plate, has the analog band-pass filter of automatic gain control etc.Consider the requirement of low-power consumption, preposition analog amplify circuit plate comprises transistor amplifier and operational amplification circuit two-stage amplifying circuit altogether, because the owned amplifying circuit of underwater sound receiving transducer, so receiving unit reality is made up of three-stage amplifier under water, wherein transducer portion is amplified 5 times, transistor amplifier amplifies about 6.7 times, and operational amplification circuit amplifies 3 times.Receiving unit amplifies 100 times altogether under water, and received signal 5 μ V～200 μ V become 0.5mV～20mV through the output of circuit amplification under water.The analog band-pass filter that has automatic gain control comprises automatic gain control, band is logical and rearmounted amplifying circuit, bandpass filter is six rank elliptic filters, form by the oval low-pass filter of oval high pass in six rank and six rank, wherein six rank high passes are that second order VCVS Hi-pass filter connects quadravalence VCVS rejection filter composition, and six rank low-pass filters connect quadravalence VCVS rejection filter by second order VCVS low-pass filter and form.Make signal gain control within the specific limits by automatic gain control (AGC) loop, outside loop, connect an amplifying circuit after the bandpass filter and make final output signal reach the A/D full scale.As shown in Figure 4, the signal that receiving transducer 33 receives, after preposition amplification, automatic gain control, bandpass filtering, isolation, isolate the rational simulating signal of output through amplifying once more at the extraneous signal of automatic gain control loop, by subsequent treatment such as industrial computer demodulating and decodings.
Simultaneously, the sea message pick-up partly also can partly carry out remote control to underwater monitoring, controls the time interval, sample frequency of its information acquisition etc., to reduce the energy consumption of underwater portion, increases the service life.
Adopt the low-noise characteristic of three grades of preposition amplification 2SC2458 of 2SC2458NPN pipe realization can avoid in the above-mentioned triode amplifying circuit to importing the interference of small-signal.
Except that preposition amplification, AC amplifier at different levels all adopt the TL082 operational amplifier to constitute amplifying circuit.TL082 has advantages such as low noise, low-power consumption, wide supply voltage.And in actual applications, circuit is simple, stable performance, the in-phase amplifier that is designed to as shown in Figure 5, the design enlargement factor be:
Because the effective frequency range of the underwater sound receiving transducer of design is 7.5kHz～12.5kHz, directly design bandpass filter difficulty is bigger, and actual performance is also not fully up to expectations, realizes this bandpass filter so adopt the method for " Hi-pass filter+low-pass filter " to make up.
In the automatic gain control module, wave detector is realized detection with common diode detection circuit, can follow very big nonlinear distortion.The reason that produces nonlinear distortion is the imperfection of the unilateal conduction characteristic of diode.Diode is connected in the feedback circuit of operational amplifier, can in the quite broad scope of detected signal amplitude, realizes very accurate linear detection.Fig. 6 is a linear detection circuit, and Fig. 7 is for working as input voltage V
iDuring for sine wave, output voltage V
oWaveform.In circuit shown in Figure 6, diode turn-on voltage has been weakened greatly to the harmful effect of detection characteristic.Its effect is equivalent to conducting is reduced to A/one of initial value.
The main effect of RC integrator is the AC signal of wave detector output, is transformed into direct current signal.As shown in Figure 8, when signal changed from weak to strong, to the accumulation of C1 two ends, C1 was in charged state to signal through R1, made C1 two ends transformation become big.When signal when dying down by force, C1 discharges by R2, C1 is in discharge condition, makes C1 two ends transformation diminish.
Direct current amplifier as shown in Figure 8, it is identical with the principle of AC amplifier, enlargement factor is:
The diode gain control is the core of whole automatic gain control, and as shown in figure 10, the principle of diode gain control is: establish V
iBe the signal input part signal, V
oBe the signal output part signal, V
bIt is the control end signal.Work as V
bDuring greater than the forward voltage of diode D1, D2, diode D1, D2 conducting.Work as V
bDuring variation because the imperfection of diode D1 volt-ampere characteristic, so the resistance of D1 also changing, thereby the resistance of the whole network below the C1 is also being changed, and this network and R1 composition bleeder circuit, thus make output terminal V
oAlso changing.So we can be by changing V
bSize, reach control V
oPurpose.
Amplifying signal shown in Figure 4 is embedded within the PCI8025 analog input card collection of industrial computer, carries out demodulating and decoding and demonstration subsequently on industrial computer.Water surface Data Receiving, processing and display system will be carried out the underwater sound and be received to the marine riser monitoring information of emission coefficient emission under water.Adopt underwater sound transmitting transducer to receive the Monitoring Data of deep water transmission, finish the conditioning of the signal that transmitting transducer is exported by receiving transducer and amplify, be converted to digital signal through A/D and input to the data demodulates system.After signal carried out demodulation, decoding, recover the various monitoring informations of each monitoring point, finally preserve or do as requested various analyses by data processing centre (DPC).
Detection effect of the present invention need determine by following several respects factor:
1, communication distance and optimum frequency section are determined
Communication system wishes that receiving end has high signal to noise ratio (S/N ratio), and therefore selecting the principle of underwater sound communication system frequency of operation is to make the signal to noise ratio (S/N ratio) of receiving end the highest.The operating distance of sound detection device depends mainly on noise level NL, receives the parameters relevant with frequency such as directional gain DI, transmission loss (TL) TL and operation of receiver frequency band W.Can prove, when emission sound source level SL one regularly, have an optimum frequency, make sound detection to operating distance reach maximal value.The factor of merit FM of system is defined as:
FM＝SL-(NL-DI+DT) (3)
According to sonar equation, to the underwater acoustic information transmission system, FM=TL is arranged, promptly FM equals the one-way propagation loss, and then corresponding with this transmission loss (TL) distance is exactly the maximum propagation distance that is allowed.Therefore, if SL, NL and DT are set-point, just can obtain maximum communication distance by the relation curve of transmission loss (TL) and distance.
FM＝TL＝nlogr+αr (4)
Following formula is differentiated, and conversion can obtain through unit:
Absorption coefficient is:
(3) formula is differentiated and can be obtained:
Because radiation power is a constant, so
And DT and frequency-independent, so
Generally, getting the noise spectrum level changes
Decibel/sound interval is got
Absorption coefficient is shown in (6) formula, and the estimator that can obtain optimum frequency is:
According to following formula, during close together, frequency optimum traffic is higher; When distance was far away, frequency optimum traffic was lower.The absorption of acoustic energy is all relevant with transmission range and signal frequency with expansion, thereby makes transmission loss (TL) relevant with distance and frequency.When vertical 3000～5000m transmits information, can get the best carrier frequency f
cShould be 11.8912～9.2109kHz;
Because the current of different depth etc. disturb different,, need on the marine riser different depth, lay many cover survey sensor groups therefore for to prevent that the data that record are complete with inclined to one side lid.
2, the minimum radiation acoustic energy of emission coefficient parameter under water
With the monitoring point of 3000m under water is example, estimates minimum acoustic energy radiation parameter:
(1) absorption coefficient a
Experimental formula between sea water absorption coefficient a and the frequency f (kHz) is:
(2) transmission loss TL
The transmission loss of vertical channel is:
TL＝20lgr+αr (10)
Experimental formula between sea water absorption coefficient a and the frequency f (kHz) is:
Wherein, f=10kHz, r=3000 rice=3.282 yard, then transmission loss (TL) is:
TL＝20lgr+αr＝70.323+3.5507＝73.847dB。
3, the sensitivity of receiving transducer and gain
The sensitivity of receiving transducer is s=15.19uV/uba (10kHz-100kHz).
Sea noise is in 4～5 both sea situations, and data is known the noise spectrum level 45-50dB of 10kHz place according to statistics, gets NL=50dB, uses the DPSK modulation, f
0=10kHz, its bandwidth B=1.5kHz, owing to adopt noncoherent detection, signal to noise ratio (S/N ratio) Si/Ni=6dB could effectively detect.
In addition, the directive property grade DI of receiving transducer
R=4.3dB, the directive property coefficient of transmitting transducer is got DI between 10-30dB
T=10dB.During no signal, the acoustic pressure that noise produces is P
N, then
10log?P
N 2＝NL+10logB-DI-100＝50+31.76-4.3-100＝-222.54
P
N＝0.0746uba
Generally between 0.2uV-0.5uV, at this moment noise voltage is inherent noise in receiver
V
N＝P
N×s＝1.133uV
The sensitivity of receiver
4, emission sound source level and signal to noise ratio (S/N ratio)
SNR＝SL-NL-TL-DI-10logB
SL＝SNR+NL+TL+DI+10logB
＝6+50+73.874+4.3+31.76＝165.934
5, emission electric power
Consider that sound source level must not be less than 180dB, sea noise fluctuating 15dB, the transmitter sound source level is got 180dB, then has:
10logP＝SL-171.5-DI
Getting radiation power is Pw=2.6w
In general, the electroacoustic transfer power of transmitting transducer is between 20%～70%, gets between 40%～50%, and emissive power Pe=P/E=2.6/0.4～0.5=6.5～5.2W is then arranged
Consider factors such as drilling platform noise, index is assigned should enough leeway, then Pe=15W.So the time receiver sensitivity can reach Vs=5uV.
In this example, the bandwidth of transmitting/receiving system is 8kHz～16kHz.If each under water the check point communication bandwidth be 500Hz, adopt the technology of frequency division multiplexing, then in the bandwidth of system, can lay 13～16 monitoring points.The performance of communication system is as shown in table 1:
Table 1 communication system performance
| Working depth | Transmission range | Bandwidth | Acoustics speed | Effective information speed | Bit error rate |
| ?200m～3000m | 200m～3000m | 500Hz | 250bit/s | 142bit/s | 10 -6 |
Claims (8)
1. the tired multipoint wireless monitoring system of a marine riser, partly constitute by parameter monitoring part, partial message transmission and message pick-up, it is characterized in that: the parameter monitoring part is made of many covers sensor groups, be distributed under the sea on a plurality of monitoring points along marine riser, gather acceleration, stress, inclination angle and the ocean flow velocity of each place, monitoring point marine riser respectively, described many cover sensor groups are controlled by two CPU industrial computers, the CPU main frame comprises single-chip microcomputer, the CPU slave comprises digital signal processor, and communication is by the HPI parallel interface between two CPU;
Partial message transmission comprises underwater sound transmitting transducer, vertical underwater acoustic channel, underwater sound receiving transducer;
Message pick-up partly comprises preposition analog amplify circuit plate, has the analog band-pass filter of automatic gain control, preposition analog amplify circuit plate comprises transistor amplifier and operational amplification circuit, and the analog band-pass filter that has automatic gain control comprises automatic gain control, band is logical isolates and rearmounted amplifying circuit.
2. the tired multipoint wireless monitoring system of marine riser as claimed in claim 1, it is characterized in that: described parameter monitoring part is gathered acceleration, stress, inclination angle and the ocean flow velocity of each place, monitoring point marine riser, and after various Monitoring Data are carried out information source coding, Error Correction of Coding, adopt frequency division multiplexing+time-multiplexed method that signal is modulated.
3. the tired multipoint wireless monitoring system of marine riser as claimed in claim 1 or 2 is characterized in that: the sensor of measuring described acceleration adopts 3-axis acceleration sensor.
4. the tired multipoint wireless monitoring system of marine riser as claimed in claim 1 is characterized in that: adopt the 2SC2458NPN pipe to realize three grades of preposition amplifications in the described triode amplifying circuit.
5. the tired multipoint wireless monitoring system of marine riser as claimed in claim 1 is characterized in that: adopt TL082 to carry out computing in the described operational amplification circuit and amplify.
6. the tired multipoint wireless monitoring system of marine riser as claimed in claim 1, it is characterized in that: automatic gain control loop is set, make signal gain control within the specific limits by automatic gain control loop, outside loop, connect an amplifying circuit after the bandpass filtering and make final output signal reach the A/D full scale.
7. the tired multipoint wireless monitoring system of marine riser as claimed in claim 1 is characterized in that: in the described automatic gain control loop, diode is connected in the feedback circuit.
8. the tired multipoint wireless monitoring system of marine riser as claimed in claim 1, it is characterized in that: described bandpass filter is six rank elliptic filters, form by the oval low-pass filter of oval high pass in six rank and six rank, wherein six rank high passes are that second order VCVS Hi-pass filter connects quadravalence VCVS rejection filter composition, and six rank low-pass filters connect quadravalence VCVS rejection filter by second order VCVS low-pass filter and form.
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| CN110986893A (en) * | 2019-12-04 | 2020-04-10 | 中国海洋石油集团有限公司 | Water depth-attitude monitoring device of mooring system |
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Application publication date: 20110824 |