CN113671035A - Bridge suspension cable stress monitoring system - Google Patents
Bridge suspension cable stress monitoring system Download PDFInfo
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- CN113671035A CN113671035A CN202111005284.XA CN202111005284A CN113671035A CN 113671035 A CN113671035 A CN 113671035A CN 202111005284 A CN202111005284 A CN 202111005284A CN 113671035 A CN113671035 A CN 113671035A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/25—Measuring force or stress, in general using wave or particle radiation, e.g. X-rays, microwaves, neutrons
- G01L1/255—Measuring force or stress, in general using wave or particle radiation, e.g. X-rays, microwaves, neutrons using acoustic waves, or acoustic emission
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/04—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring tension in flexible members, e.g. ropes, cables, wires, threads, belts or bands
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/44—Processing the detected response signal, e.g. electronic circuits specially adapted therefor
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/45—Differential amplifiers
- H03F3/45071—Differential amplifiers with semiconductor devices only
- H03F3/45076—Differential amplifiers with semiconductor devices only characterised by the way of implementation of the active amplifying circuit in the differential amplifier
- H03F3/4508—Differential amplifiers with semiconductor devices only characterised by the way of implementation of the active amplifying circuit in the differential amplifier using bipolar transistors as the active amplifying circuit
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
- H03H7/01—Frequency selective two-port networks
- H03H7/06—Frequency selective two-port networks including resistors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
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Abstract
The invention discloses a stress monitoring system for a bridge stay cable, which effectively solves the problem that the accuracy of a damaged signal is influenced by a filtering mode set by an ultrasonic detection method in the prior art, so that the judgment of a worker on the stress of the stay cable is influenced.
Description
Technical Field
The invention relates to the field of bridge monitoring, in particular to a bridge stay cable stress monitoring system.
Background
With the improvement of the building technology, the appearance of the bridge appears in various forms, such as an arch bridge, a cable-stayed bridge, a suspension bridge, a viaduct and a combined system bridge, wherein the most obvious characteristic of the cable-stayed bridge is that a stay cable exists between a cable tower and a bridge deck girder, and therefore, the use safety of the stay cable is related to the safety of the whole bridge. The discovery in the use of cable-stay bridge, receiving artificial or natural calamity's destruction at the suspension cable, the inside stress of suspension cable can appear changing, leads to the structural stress of bridge self to appear changing, can form serious influence to the performance and the life of bridge even. It is desirable to search for a cable that can detect a damage or a flaw of a stay cable comprehensively and pay close attention to the stress of the stay cable.
In the prior art, various detection modes are generated for the damage of the stay cable, such as a ray detection method, a magnetic leakage detection method, a magnetostrictive guided wave method, a cable force monitoring method, an acoustic emission detection method, a mode test method, a Bragg fiber grating sensor method, an ultrasonic detection method and the like, but some of the methods are eliminated due to the problems of detection efficiency, manufacturing cost, difficulty in processing detected signals and the like, while the ultrasonic detection method has a good effect, in the actual use process, the ultrasonic sensor is used as a signal acquisition module, the acquired damage signal is transmitted to a monitoring center through a signal transmission module for processing, so that a worker is reminded that the stress of the stay cable needs to be changed and needs to pay attention, but the damage signal is influenced by ripples carried by a power supply of the ultrasonic sensor to cause the problem of accuracy reduction, the solution of the prior art is to set a filtering module in the monitoring center, but the loss caused by this method will affect the accuracy of the damaged signal, thereby affecting the judgment of the stress of the stay cable by the staff.
The present invention therefore provides a new solution to this problem.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a stress monitoring system for a bridge stay cable, which effectively solves the problem that the filtering mode set by an ultrasonic detection method in the prior art influences the accuracy of a damaged signal, so that the judgment of a worker on the stress of the stay cable is influenced.
The technical scheme of its solution is, a bridge suspension cable stress monitoring system, including signal acquisition module and signal transmission module, the signal acquisition module includes ultrasonic sensor U1, filtering output circuit and signal processing circuit, filtering output circuit transmits the damaged signal that ultrasonic sensor U1 gathered to signal processing circuit after filtering and amplification, signal processing circuit obtains the difference signal after carrying out the difference with the damaged signal that filtering output circuit transmitted, and the difference signal operates the damaged signal to the signal transmission module is damaged in the output.
Further, the filter output circuit comprises a resistor R1, one end of the resistor R1 is connected to the 2 pin of the ultrasonic sensor U1, the other end of the resistor R1 is connected to the non-inverting terminal of the operational amplifier U2B, the inverting terminal of the operational amplifier U2B is connected to the output terminal of the operational amplifier U2B, one end of the resistor R2, and one end of the capacitor C1, the other end of the resistor R2 is connected to one end of the capacitor C2, one end of the resistor R3, and the base of the transistor Q1, the collector of the transistor Q1 is connected to one end of the resistor R4 and the collector of the transistor Q2, the other end of the resistor R4 is connected to the 1 pin of the ultrasonic sensor U1 and connected to the positive power VCC, the emitter of the transistor Q1 is connected to the base of the transistor Q2, and the emitter of the transistor Q2 is connected to the other end of the capacitor C2, the other end of the capacitor C1, and the 3 pin of the ultrasonic sensor U1.
Furthermore, the signal processing circuit comprises a differentiator and an outputter, the differentiator differentiates the damaged signal transmitted by the filtering output circuit to obtain a differential signal, the differential signal switches on the outputter and transmits the damaged signal to the outputter, and the outputter performs operation by using the differential signal and the damaged signal and transmits the damaged signal to the signal transmission module.
Further, the differentiator includes a resistor R5, one end of the resistor R5 is connected to one end of the switch S1, an anode of the thyristor Q6, a collector of a transistor Q2 in the filter output circuit, and one end of a resistor R4, the other end of the resistor R5 is connected to a base of the transistor Q4, a collector of the transistor Q4 is connected to one end of the resistor R6, an anode of the diode D1, a base of the transistor Q3, one end of the resistor R13, a collector of the transistor Q13, and one end of the resistor R13, an emitter of the transistor Q13 is connected to one end of the resistor R13, an emitter of the transistor Q13, and one end of the resistor R13, the other end of the resistor R13 is connected to the other end of the resistor R13, an emitter of the transistor Q13 is connected to one end of the relay K13, a base of the transistor Q13 is connected to one end of the resistor R13, and the other end of the resistor R13 is connected to an output terminal of the filter output circuit U2 of the filter output circuit 13. The negative electrode of the diode D1 is respectively connected with one end of a bidirectional voltage regulator tube D2, one end of a capacitor C3 and the control electrode of a thyristor Q6, and the other end of the relay K1 is respectively connected with the other end of a capacitor C3, the other end of a bidirectional voltage regulator tube D2 and the other end of a resistor R9 and is connected with the ground in parallel.
Further, the output device includes a resistor R10, one end of the resistor R10 is connected to one end of the resistor R17 and the cathode of the thyristor Q6 in the differentiator, the other end of the resistor R10 is connected to the non-inverting end of the operational amplifier U3B and one end of the resistor R12, the inverting end of the operational amplifier U3B is connected to one end of the resistor R11 and one end of the resistor R68628, the other end of the resistor R5739 is connected to the other end of the resistor R8 in the differentiator and the output end of the operational amplifier U2B in the filter output circuit, the output end of the operational amplifier U3B is connected to the other end of the resistor R14 and one end of the resistor R16, the other end of the resistor R16 is connected to the inverting end of the operational amplifier U5B and one end of the resistor R19, the other end of the resistor R19 is connected to one end of the switch S19 and the output end of the operational amplifier U5 19, the non-inverting end of the operational amplifier U5 19 is connected to the other end of the switch Q19, and the other end of the switch Q19 in the differentiator 19 is connected to the switch Q19, One end of the resistor R15 and the other end of the resistor R15 are connected with the same phase end of the operational amplifier U4B, the reverse end of the operational amplifier U4B is respectively connected with the output end of the operational amplifier U4B and the signal transmission module, and the other end of the resistor R18 is respectively connected with the other end of the resistor R12, the other end of the relay K1 in the differentiator and the other end of the capacitor C2 in the filter output circuit and connected with the ground in parallel.
The invention realizes the following beneficial effects:
the damaged signal to ultrasonic sensor U1 collection has set up filtering output circuit, carry out pi type filtering to the damaged signal, when in power supply with positive polarity power VCC with avoiding ultrasonic sensor U1, the ripple that positive polarity power VCC carried leads to the fact the influence to the damaged signal, avoid the ripple to influence the accuracy of damaged signal, also utilize triode Q1, the compound pipe that triode Q2 constitutes has avoided the damaged signal to produce when utilizing pi type filter to filter the loss, make the problem of the accuracy decline of damaged signal appear, the accuracy of damaged signal has been guaranteed, thereby avoid influencing the staff to the judgement of the stress of suspension cable, also avoided prior art to set up filtering module at the surveillance center, lead to the damaged signal to produce the loss at the filtering, but the problem that can't carry out accurate compensation to the damaged signal produces.
Drawings
Fig. 1 is a schematic circuit diagram of a filter output circuit according to the present invention.
Fig. 2 is a schematic diagram of a signal processing circuit of the present invention.
Detailed Description
The foregoing and other technical and functional aspects of the present invention will be apparent from the following detailed description of the embodiments, which proceeds with reference to the accompanying figures 1-2. The structural contents mentioned in the following embodiments are all referred to the attached drawings of the specification.
Exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.
The utility model provides a bridge suspension cable stress monitoring system, uses in the suspension cable of bridge, including signal acquisition module and signal transmission module, the signal acquisition module includes ultrasonic sensor U1, filtering output circuit and signal processing circuit, filtering output circuit transmits to signal processing circuit after the damaged signal that ultrasonic sensor U1 gathered through filtering and amplification, signal processing circuit obtains the difference signal after carrying out the difference with the damaged signal that filtering amplification circuit transmission was come, and the difference signal operates damaged signal to the signal transmission module is damaged in the output.
The filter output circuit comprises a resistor R1, one end of a resistor R1 is connected with a pin 2 of an ultrasonic sensor U1, the other end of the resistor R1 is connected with a non-inverting end of an operational amplifier U2B, the inverting end of the operational amplifier U2B is respectively connected with the output end of an operational amplifier U2B, one end of a resistor R2 and one end of a capacitor C1, the other end of a resistor R2 is respectively connected with one end of the capacitor C2, one end of a resistor R3 and the base of a triode Q1, the collector of a triode Q1 is respectively connected with one end of a resistor R4 and the collector of a triode Q2, the other end of a resistor R4 is connected with a pin 1 of the ultrasonic sensor U1 and is connected with a positive power supply VCC, the emitter of the triode Q1 is connected with the base of a triode Q2, the emitter of a triode Q2 is respectively connected with the other end of a capacitor C2, the other end of the capacitor C1 and the pin 3 of the ultrasonic sensor U1 and is connected with the ground in parallel;
the filter output circuit utilizes the resistor R2 to transmit the damaged signal acquired by the ultrasonic sensor U1 to the operational amplifier U2B, the ultrasonic sensor U1 adopts a model similar to that of T30UINA to acquire the damaged signal, the selection of the ultrasonic sensor U1 is the prior art, and details are not repeated herein, when the operational amplifier U2B outputs a signal, namely the stayed cable of the bridge is damaged, the stress in the stayed cable is changed immediately, the operational amplifier U2B improves the driving capability of the damaged signal, reduces the conduction loss of the damaged signal to avoid influencing the accuracy of the damaged signal, utilizes a pi-type filter composed of the capacitor C1, the resistor R2 and the capacitor C2 to filter to avoid the influence of the ripple carried by the positive polarity power supply VCC on the damaged signal when the ultrasonic sensor U1 supplies power by the positive polarity power supply VCC, and avoids the influence of the accuracy of the ripple on the damaged signal, in order to avoid the loss generation of the damaged signal when the pi-type filter is used for filtering, so that the accuracy of the damaged signal is reduced, the composite tube consisting of the triode Q1 and the triode Q2 is used for carrying out compensatory amplification on the signal, the accuracy of the damaged signal is not influenced by the pi-type filter as far as possible, and the damaged signal is transmitted to the signal processing circuit.
The differentiator comprises a resistor R5, one end of a resistor R5 is respectively connected with one end of a switch S1, the anode of a thyristor Q6, the collector of a triode Q2 and one end of a resistor R4 in the filter output circuit, the other end of the resistor R5 is connected with the base of a triode Q4, the collector of the triode Q4 is respectively connected with one end of a resistor R6, the anode of a diode D1, the base of a triode Q3, one end of a resistor R13, the collector of a triode Q5 and one end of a resistor R7, the emitter of a triode Q4 is respectively connected with one end of a resistor R9, the emitter of a triode Q5 and one end of a resistor R9, the other end of the resistor R6 is respectively connected with the other end of a resistor R13, the emitter of a triode Q3 and the other end of a resistor R7, the collector of the triode Q3 is connected with one end of a relay K1, the base of a resistor Q5 is connected with one end of a resistor R8, the other end of a resistor R8 and the other end of an output circuit U2B, the negative electrode of the diode D1 is respectively connected with one end of a bidirectional voltage regulator tube D2, one end of a capacitor C3 and the control electrode of a thyristor Q6, and the other end of the relay K1 is respectively connected with the other end of a capacitor C3, the other end of a bidirectional voltage regulator tube D2 and the other end of a resistor R9 and is connected with the ground in parallel;
the output device comprises a resistor R10, one end of the resistor R10 is respectively connected with one end of a resistor R17 and the cathode of a thyristor Q6 in the differentiator, the other end of the resistor R10 is respectively connected with the in-phase end of an operational amplifier U3B and one end of a resistor R12, the reverse end of the operational amplifier U3B is respectively connected with one end of a resistor R11 and one end of a resistor R14, the other end of the resistor R11 is respectively connected with the other end of a resistor R8 in the differentiator and the output end of an operational amplifier U2B in the filtering output circuit, the output end of the operational amplifier U3B is respectively connected with the other end of a resistor R14 and one end of a resistor R16, the other end of a resistor R16 is respectively connected with the reverse end of an operational amplifier U5B and one end of a resistor R19, the other end of the resistor R19 is respectively connected with one end of a switch S19 and the output end of the operational amplifier U5 19, the in-phase end of the operational amplifier U5 19 is respectively connected with the other end of the switch Q19, One end of a resistor R15, the other end of the resistor R15 is connected with the same-phase end of an operational amplifier U4B, the reverse end of the operational amplifier U4B is respectively connected with the output end of the operational amplifier U4B and a signal transmission module, and the other end of a resistor R18 is respectively connected with the other end of a resistor R12, the other end of a relay K1 in the differentiator and the other end of a capacitor C2 in the filter output circuit and is connected with the ground in parallel;
the signal processing circuit comprises a differentiator and an outputter, in order to prevent the signal amplification of the triode Q1 and the triode Q2 from being too large and exceeding the actual amplitude of the damaged signal, so that the accuracy of the damaged signal is reduced, the differentiator receives the damaged signal output by the filtering output circuit by using a resistor R5, the resistor R5 transmits the damaged signal to a differential amplifier consisting of a triode Q4, a triode Q5, a resistor R6 and a resistor R7 for differential operation to obtain a differential signal, and amplifies the differential signal, the triode Q5 receives a standard signal, wherein the standard signal is a pi signal output by an operational amplifier U2B and not filtered by a filter, namely the damaged signal without loss, and when the amplified differential signal switches on the triode Q7, the amplitude of the damaged signal amplified by the triode Q1 and the triode Q2 is not different from the actual amplitude of the damaged signal, at this time, the triode Q3 turns on the relay K1, the switch S1 is closed, the switch S2 is opened, the switch S1 outputs the damaged signal to the operational amplifier U4B in the output device, wherein the switch S1 and the switch are pin switches of the relay K1, when the amplified differential signal is to be turned on through the diode D1, the amplitude of the damaged signal amplified through the triode Q1 and the triode Q2 is greater than the amplitude of the damaged signal actually output by the ultrasonic sensor U1, the diode D1 turns on the thyristor Q6 through the capacitor C3, the output device is turned on, the bidirectional voltage regulator D2 is used to avoid the surge phenomenon caused by the differential signal, and the safety of the signal acquisition module is not affected, the output device receives the differential signal output by the differentiator through the resistor R10, the resistor R11 receives the standard signal, and the signal output by the operational amplifier U3B is the standard signal and the signal output through the triode Q1, the amplifier U4B, The difference value of the damaged signal amplified by the triode Q2 is transmitted to the operational amplifier U5B through the resistor R16, the operational amplifier U5B outputs the damaged signal after subtraction of the signal and the amplified damaged signal, the damaged signal at this time is that no ripple interference or loss is generated, the damaged signal is output to the operational amplifier U4B through the closed switch S2, the operational amplifier U4B buffers the damaged signal and transmits the buffered damaged signal to the signal transmission module, and the signal transmission module transmits the damaged signal to the monitoring center for analysis.
When the ultrasonic signal processing circuit is used, the signal acquisition module comprises an ultrasonic sensor U1, a filtering output circuit and a signal processing circuit, the filtering output circuit utilizes a resistor R2 to transmit a damaged signal acquired by an ultrasonic sensor U1 to an operational amplifier U2B to improve the driving capability of the damaged signal, utilizes a pi-type filter consisting of a capacitor C1, a resistor R2 and a capacitor C2 to filter the signal so as to prevent the damaged signal from being influenced by ripples carried by a positive polarity power supply VCC when the ultrasonic sensor U1 is powered by the positive polarity power supply VCC, utilizes a composite tube consisting of a triode Q1 and a triode Q2 to perform compensatory amplification on the signal so that the accuracy of the damaged signal is not influenced by the pi-type filter as much as possible, and transmits the damaged signal to the signal processing circuit, wherein the signal processing circuit comprises a differentiator and an outputter so as to prevent the triode Q1, The triode Q2 amplifies the signal excessively, the differentiator utilizes a resistor R5 to receive the damaged signal output by the filter output circuit, the resistor R5 transmits the damaged signal to a differential amplifier consisting of the triode Q4, the triode Q5, the resistor R6 and the resistor R7 to perform differential operation to obtain a differential signal, and amplifies the differential signal, the triode Q5 receives a standard signal, when the amplified differential signal switches on the triode Q7, the amplitude of the damaged signal amplified by the triode Q1 and the triode Q2 is not different from the actual damaged signal, the triode Q3 switches on the relay K1, the switch S1 is closed, the switch S2 is disconnected, the switch S1 outputs the damaged signal to an operational amplifier U4B in the exporter, and when the amplified differential signal is switched on by a diode D1, the amplitude of the damaged signal amplified by the triode Q1 and the triode Q2 is larger than the amplitude of the actual damaged signal output by the ultrasonic sensor U1, the diode D1 conducts the thyristor Q6 through the capacitor C3, the output device conducts, the bidirectional voltage regulator tube D2 is used for avoiding the surge phenomenon caused by the differential signal, the influence on the safety of the signal acquisition module is avoided, the output device receives the differential signal output by the differentiator through the resistor R10 and receives the standard signal through the resistor R11, the signal output by the operational amplifier U3B is the standard signal and passes through the triode Q1, the difference value of the damage signal amplified by the triode Q2 is transmitted to the operational amplifier U5B through the resistor R16, the operational amplifier U5B outputs the damage signal after subtracting the signal from the amplified damage signal, the damage signal is output to the operational amplifier U4B through the closed switch S2, the operational amplifier U4B buffers the damage signal and transmits the signal to the signal transmission module, and the signal transmission module transmits the damage signal to the monitoring center for analysis.
The invention achieves the following effects:
(1) the filter output circuit is arranged for the damaged signal collected by the ultrasonic sensor U1, pi-type filtering is carried out on the damaged signal, so that the influence of ripples carried by a positive polarity power supply VCC on the damaged signal is avoided when the ultrasonic sensor U1 supplies power with the positive polarity power supply VCC, the influence of the ripples on the damaged signal is avoided, the influence of the ripples on the accuracy of the damaged signal is avoided, the problem that the damage of the damaged signal is caused by loss when the damaged signal is filtered by using a pi-type filter is avoided by using a composite tube consisting of a triode Q1 and a triode Q2, the accuracy of the damaged signal is reduced is ensured, the judgment of stress of a worker on an inclined stay cable is avoided, and the problem that the damage of the damaged signal is caused by loss in filtering and cannot be accurately compensated by using a filter module arranged in a monitoring center in the prior art is also avoided;
(2) set up triode Q1 among the signal output circuit detection filter output circuit, the magnifying power of the compound pipe that triode Q2 is constituteed, when the differentiator detects that the damaged signal is by compound pipe enlarged too big, switch on the follower, the damaged signal of follower after will compounding the pipe and enlarging carries out twice operation, the accuracy of damaged signal has been guaranteed, when the differentiator detects that the damaged signal is by compound pipe enlarged just suitable, with damaged signal transmission to fortune put the ware U4B on, through the signal transmission module with the surveillance center, avoided the damaged signal to pass through fortune put the ware U5B when need not to compensate, the problem of the useless work that fortune put the ware U3B and make appears.
Claims (5)
1. The utility model provides a bridge suspension cable stress monitoring system, includes signal acquisition module and signal transmission module, its characterized in that, signal acquisition module includes ultrasonic sensor U1, filtering output circuit and signal processing circuit, filtering output circuit transmits to signal processing circuit after the damaged signal that ultrasonic sensor U1 gathered with filtering output circuit is filtered and is amplified, signal processing circuit obtains differential signal after carrying out the difference with the damaged signal that filtering output circuit transmitted, and differential signal operates damaged signal to the signal transmission module is damaged in the output.
2. The bridge stay cable stress monitoring system as claimed in claim 1, wherein the filter output circuit comprises a resistor R1, one end of the resistor R1 is connected to 2 pins of the ultrasonic sensor U1, the other end of the resistor R1 is connected to the non-inverting terminal of the operational amplifier U2B, the inverting terminal of the operational amplifier U2B is connected to the output terminal of the operational amplifier U2B, one end of the resistor R2 and one end of the capacitor C1, the other end of the resistor R2 is connected to one end of the capacitor C2, one end of the resistor R3 and the base of the transistor Q1, the collector of the transistor Q1 is connected to one end of the resistor R4 and the collector of the transistor Q2, the other end of the resistor R4 is connected to 1 pin of the ultrasonic sensor U1 and connected to the positive polarity power source VCC, the emitter of the transistor Q1 is connected to the base of the transistor Q2, the emitter of the transistor Q2 is connected to the other end of the capacitor C2 and the other end of the capacitor C1, respectively, The 3 pins of the ultrasonic sensor U1 are connected in parallel to ground.
3. The bridge stay cable stress monitoring system according to claim 1, wherein the signal processing circuit comprises a differentiator and an outputter, the differentiator differentiates the damaged signal transmitted from the filter output circuit to obtain a differential signal, the differential signal switches on the outputter and transmits the damaged signal to the outputter, and the outputter performs an operation by using the differential signal and the damaged signal and transmits the damaged signal to the signal transmission module.
4. A bridge stay cable stress monitoring system as claimed in claim 3, wherein the differentiator comprises a resistor R5, one end of a resistor R5 is connected with one end of a switch S1, an anode of a thyristor Q6, a collector of a transistor Q2 in the filter output circuit, and one end of a resistor R4, the other end of a resistor R5 is connected with a base of a transistor Q4, a collector of the transistor Q4 is connected with one end of a resistor R6, an anode of a diode D1, a base of a transistor Q3, one end of a resistor R13, a collector of a transistor Q5, and one end of a resistor R7, an emitter of a transistor Q4 is connected with one end of a resistor R9, an emitter of a transistor Q5, and one end of a resistor R9, the other end of a resistor R6 is connected with the other end of a resistor R13, an emitter of a transistor Q3, and the other end of a resistor R7, and a collector of a transistor Q3 is connected with one end of a relay K1, the base electrode of the triode Q5 is connected with one end of a resistor R8, the other end of the resistor R8 is connected with the output end of an operational amplifier U2B in the filter output circuit, the negative electrode of a diode D1 is respectively connected with one end of a bidirectional voltage regulator tube D2, one end of a capacitor C3 and the control electrode of a thyristor Q6, and the other end of a relay K1 is respectively connected with the other end of a capacitor C3, the other end of the bidirectional voltage regulator tube D2 and the other end of the resistor R9 and connected with the ground in parallel.
5. The bridge stay cable stress monitoring system according to claim 3, wherein the output device comprises a resistor R10, one end of the resistor R10 is connected to one end of the resistor R17 and the cathode of the thyristor Q6 in the differentiator, the other end of the resistor R10 is connected to the non-inverting terminal of the operational amplifier U3B and one end of the resistor R12, the inverting terminal of the operational amplifier U3B is connected to one end of the resistor R11 and one end of the resistor R14, the other end of the resistor R11 is connected to the other end of the resistor R8 in the differentiator and the output terminal of the operational amplifier U2B in the filtering output circuit, the output terminal of the operational amplifier U3B is connected to the other end of the resistor R14 and one end of the resistor R16, the other end of the resistor R16 is connected to the inverting terminal of the operational amplifier U5B and one end of the resistor R19, the other end of the resistor R19 is connected to one end of the switch S2, the output terminal of the operational amplifier U B, and the other end of the resistor R17 is connected to the output terminal of the amplifier U8427, One end of a resistor R18 and the other end of a switch S2 are respectively connected with the other end of a switch Q1 and one end of a resistor R15 in the differentiator, the other end of the resistor R15 is connected with the non-inverting end of an operational amplifier U4B, the inverting end of the operational amplifier U4B is respectively connected with the output end of the operational amplifier U4B and a signal transmission module, the other end of the resistor R18 is respectively connected with the other end of a resistor R12, the other end of a relay K1 in the differentiator and the other end of a capacitor C2 in the filter output circuit and connected with the other end in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111005284.XA CN113671035A (en) | 2021-08-30 | 2021-08-30 | Bridge suspension cable stress monitoring system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111005284.XA CN113671035A (en) | 2021-08-30 | 2021-08-30 | Bridge suspension cable stress monitoring system |
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| CN113671035A true CN113671035A (en) | 2021-11-19 |
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| CN202111005284.XA Withdrawn CN113671035A (en) | 2021-08-30 | 2021-08-30 | Bridge suspension cable stress monitoring system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114062920A (en) * | 2021-11-30 | 2022-02-18 | 河南职业技术学院 | Internet of things detection circuit for power switch cabinet |
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2021
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114062920A (en) * | 2021-11-30 | 2022-02-18 | 河南职业技术学院 | Internet of things detection circuit for power switch cabinet |
| CN114062920B (en) * | 2021-11-30 | 2023-07-14 | 河南职业技术学院 | Internet of things detection circuit for power switch cabinet |
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Application publication date: 20211119 |
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