CN105424161A - Collection system, judgment system, collection method and judgment method for vibration state of breaker housing - Google Patents
Collection system, judgment system, collection method and judgment method for vibration state of breaker housing Download PDFInfo
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- CN105424161A CN105424161A CN201510957736.2A CN201510957736A CN105424161A CN 105424161 A CN105424161 A CN 105424161A CN 201510957736 A CN201510957736 A CN 201510957736A CN 105424161 A CN105424161 A CN 105424161A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H1/00—Measuring characteristics of vibrations in solids by using direct conduction to the detector
- G01H1/12—Measuring characteristics of vibrations in solids by using direct conduction to the detector of longitudinal or not specified vibrations
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
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Abstract
The invention discloses a collection system, judgment system, collection method and judgment method for a vibration state of a breaker housing. The collection system and the judgment system mainly comprise an acceleration sensor, a signal conditioning module, a trigger circuit, an SPI, a DSP system and an ARM system, wherein the acceleration sensor is connected to the signal conditioning module; an output end of the signal conditioning module is connected to the DSP system; the DSP system is connected to the ARM system by the SPI; and an output contact point of the trigger circuit is connected to the DSP system. The systems also comprise a touch display screen, wherein the touch display screen is connected to the ARM system. The system monitors vibration of the breaker housing so as to carry out state diagnosis of a breaker. The set of systems is based on an embedded system, requires small space, realizes friendly human-computer interactions, helps maintenance staffs determine a working state of the breaker easily and can prolong service life of the breaker.
Description
Technical field
The present invention relates to isolating switch casing vibration monitoring field, particularly isolating switch casing vibrational state acquisition system, judge system, acquisition method and determination methods.
Background technology
In electric system, according to the traffic control demand of electrical network, isolating switch is utilized reliably to drop into or excise circuit and electrical equipment.Isolating switch is disconnected by contact opening and closing, closed circuit.Because breaker closing action is linked by inner each several part mechanism, produce stronger vibration and impact simultaneously, if circuit breaker internal structure changes or has mechanisms fail, then the vibration of casing can change, and therefore can be carried out the condition diagnosing of isolating switch by the vibration of monitoring breaker casing.The problems such as and existing vibration signal circuit breaker diagnosis system exists installation complexity, the large use of system bulk is dumb, and man-machine interaction is friendly not.
Summary of the invention
The technical matters that the present invention solves is to provide a kind of isolating switch casing vibrational state acquisition system vibrated by monitoring breaker casing and then judge circuit-breaker status.
The technical solution adopted for the present invention to solve the technical problems is: isolating switch casing vibrational state acquisition system, comprise speed pickup, signal regulating device, trigger circuit, SPI, dsp system and ARM system, described acceleration transducer is connected with Signal-regulated kinase, the output terminal of Signal-regulated kinase is connected with dsp system, dsp system is connected with ARM system by SPI, the output contact two ends of described trigger circuit are connected with external interrupt pin with the power supply of dsp system respectively, also comprise touch display screen, described touch display screen is connected with ARM system;
Described acceleration transducer is for measuring isolating switch casing vibration signal, described trigger circuit are sampled in order to trigger DSP external interrupt, described dsp system in order to carry out AD sampling, data processing send data to ARM system by SPI, described ARM system in order to receive DSP and send data, preservation being presented on touch display screen.
Further: also comprise the AD sampling A/D chip be connected between Signal-regulated kinase and dsp system, the model of described AD sampling A/D chip is AD7606, dsp chip model in described dsp system is TMS320F28335, and the model of the ARM chip in described ARM system is S3C6410.
Further: described trigger circuit comprise two groups of resistance and light coupling relay, described two groups of resistance are connected on light coupling relay two input end respectively.
The present invention also introduces a kind of isolating switch casing vibrational state and judges system, comprise acceleration transducer, signal regulating device, trigger circuit, SPI, dsp system and ARM system, described acceleration transducer is connected with Signal-regulated kinase, the output terminal of Signal-regulated kinase is connected with dsp system, dsp system is connected with ARM system by SPI, the output contact two ends of described trigger circuit are connected with external interrupt pin with the power supply of dsp system respectively, also comprise touch display screen, described touch display screen is connected with ARM system;
Described acceleration transducer is for measuring isolating switch casing vibration signal, described trigger circuit are sampled in order to trigger DSP external interrupt, described dsp system is in order to carry out AD sampling, data processing send data to ARM system by SPI, described ARM system is in order to the data that receive DSP and send and process data, preserve and be presented on touch display screen, described ARM system also comprises judge module, in order to judge that circuit-breaker status is whether normal and result to be shown on touch display screen.
Further: also comprise the AD sampling A/D chip be connected between Signal-regulated kinase and dsp system, the model of described AD sampling A/D chip is AD7606, dsp chip model in described dsp system is TMS320F28335, and the model of the ARM chip in described ARM system is S3C6410.
Further: described trigger circuit comprise two groups of resistance and light coupling relay, described two groups of resistance are connected on light coupling relay two input end respectively.
The present invention also provides a kind of isolating switch casing vibrational state acquisition method, when isolating switch receives separating brake or reclosing command, obtain voltage with the resistance light coupling relay branch road two ends of divide-shut brake coils from parallel connection of coils simultaneously, light coupling relay output contact is closed makes DSP obtain signal, DSP external interrupt produces negative edge and becomes low level, dsp system provides sampling clock for outside A/D chip and reads the vibration signal after its analog to digital conversion, after sampling, if breaker closing, then DSP is to vibration signal 3 layers of WAVELET PACKET DECOMPOSITION that to carry out with DB4 small echo be base, obtain 8 sequences, ask the Energy-Entropy of these 8 sequences respectively, 8 entropy obtained are as characteristic quantity, DSP sends data to ARM system by SPI again, backstage is entered interruption by the SPI driver module in ARM system after SPI receives data, automatically its characteristic quantity is preserved, and characteristic quantity is shown on touch display screen.
The present invention also provides a kind of isolating switch casing vibrational state determination methods, when isolating switch receives separating brake or reclosing command, obtain voltage with the resistance light coupling relay branch road two ends of divide-shut brake coils from parallel connection of coils simultaneously, light coupling relay output contact is closed makes DSP obtain signal, DSP external interrupt produces negative edge and becomes low level, dsp system provides sampling clock for outside A/D chip and reads the vibration signal after its analog to digital conversion, after sampling, if breaker closing, then DSP is to vibration signal 3 layers of WAVELET PACKET DECOMPOSITION that to carry out with DB4 small echo be base, obtain 8 sequences, ask the Energy-Entropy of these 8 sequences respectively, 8 entropy obtained are as characteristic quantity, DSP sends data to ARM system by SPI again, backstage is entered interruption by the SPI driver module in ARM system after SPI receives data, automatically its characteristic quantity is preserved, before its characteristic quantity is judged, once must train SVM algorithm of support vector machine, first collect according to above method and be no less than 30 groups of same model isolating switchs combined floodgate vibr ation signals sample in normal state, be labeled as normal sample, the type of SVM is set to one-class-svm, and with this group sample training, after having trained, the characteristic quantity newly recorded is sent in SVM support vector machine and judges, and result is shown on touch display screen.
The invention has the beneficial effects as follows: the present invention can sample each breaker closing time casing vibration, and extract its characteristic quantity, circuit-breaker status can be judged accurately; This cover system is based on embedded system, and requisite space is little, and man-machine interaction is friendly, and easy access personnel judge working state of circuit breaker, extends isolating switch serviceable life.
Accompanying drawing explanation
Fig. 1 is isolating switch casing vibrational state acquisition system one-piece construction figure.
Fig. 2 is isolating switch casing vibrational state acquisition system method flow diagram.
Fig. 3 is trigger circuit schematic diagram.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is further described.
Isolating switch (English name: circuit-breaker, circuitbreaker) refer to the electric current that can close, carry and cut-off under normal loop condition and can close, the switchgear of carrying and the electric current under cut-offfing abnormal loop condition in official hour.Isolating switch forms primarily of 3 essential parts, i.e. contact, arc quenching system and various electrical apparatus release, comprises overcurrent trip, decompression (under-voltage) electrical apparatus release, thermal trip, shunt release and automatically jumping device.Killer switch is manual or electric switch-on by operating mechanism, and after contact closure, contact is locked on closing position by free tripping mechanism.When above-mentioned fault occurs circuit, make free tripping mechanism action by respective electrical apparatus release, automatic trip is to realize protective effect.Shunt release then divides the use of deenergizing as far distance controlled.Overcurrent trip is used for short circuit and the overcurrent protection of circuit, and when the electric current of circuit is greater than the current value adjusted, the electromagnetic force that overcurrent trip produces makes hook thread off, and moving contact disconnects rapidly under the pulling force of spring, realizes the trip avoidance function of short-circuiting device.Because breaker closing action is linked by inner each several part mechanism, produce stronger vibration and impact simultaneously, if circuit breaker internal structure changes or has mechanisms fail, then the vibration of casing can change, and therefore can be carried out the condition diagnosing of isolating switch by the vibration of monitoring breaker casing.
As shown in Figure 1 to Figure 2, isolating switch casing vibrational state acquisition system, it is characterized in that: comprise acceleration transducer, signal regulating device, trigger circuit, SPI, dsp system and ARM system, described SPI is the abbreviation of Serial Peripheral Interface (SPI) (SerialPeripheralInterface), SPI, a kind of high speed, full duplex, synchronous communication bus.Described DSP is the abbreviation of digital signal processing (digitalsignalprocessing), it is the theory and technology processed signal by the mode of numerical evaluation, and described ARM system is the first item risc microcontroller of Acorn company limited towards low budget Market Design.More early be called AcornRISCMachine.Described acceleration transducer is connected with Signal-regulated kinase, the output terminal of Signal-regulated kinase is connected with dsp system, dsp system is connected with ARM system by SPI, the output contact two ends of described trigger circuit are connected with external interrupt pin with the power supply of dsp system respectively, also comprise touch display screen, described touch display screen is connected with ARM system, when isolating switch being detected, first degree of will speed up sensor is installed on isolating switch cabinet top, two input ends of trigger circuit are connected in breaker closing coil and switching winding two ends respectively, now make isolating switch work, casing can produce vibration, acceleration transducer and trigger circuit obtain signal simultaneously and start working, because acceleration transducer is connected with signal processing module, the chip model that the signal processing module of this system uses is CM3502, the chip model of acceleration transducer is CA-YD-180, described signal processing module for acceleration transducer provide constant-current supply simultaneously degree of will speed up sensor export be superimposed upon interchange in direct current (DC) bias by acceleration signals by CR high pass every straight output, every falling direct current (DC) bias, interchange acceleration signal is transmitted to dsp system, , simultaneously due to the triggering of trigger circuit, the external interrupt of dsp system produces negative edge and becomes low level, DSP enters Sampling interrupt and carries out data sampling, the simulating signal collected used AD in the sheet of DSP to carry out analog to digital conversion and convert digital signal to, DSP is again to digital signal 3 layers of WAVELET PACKET DECOMPOSITION that to carry out with DB4 small echo be base, obtain the Energy-Entropy of 8 sequences, obtain 8 entropy as characteristic quantity, DSP carries and the characteristic quantity obtained is sent data to ARM system by SPI, backstage is entered interruption by the SPI driver module in ARM system after SPI receives data, the characteristic quantity of automatic preservation vibration signal, and characteristic quantity is shown on touch display screen, maintainer compares according to the characteristic quantity of the isolating switch that the characteristic quantity that touch display screen shows records with the isolating switch under the normal condition detected in the past, draw the state of this isolating switch.This cover system is based on embedded system, and requisite space is little, and easy access personnel judge working state of circuit breaker, extend isolating switch serviceable life, and maintainer consults data in the past by touch display screen, and man-machine interaction is friendly.
The present invention also provides set of system to be that isolating switch casing vibrational state judges system, comprise acceleration transducer, signal regulating device, trigger circuit, SPI, dsp system and ARM system, described acceleration transducer is connected with Signal-regulated kinase, the output terminal of Signal-regulated kinase is connected with dsp system, dsp system is connected with ARM system by SPI, the output contact two ends of described trigger circuit are connected with external interrupt pin with the power supply of dsp system respectively, also comprise touch display screen, described touch display screen is connected with ARM system; Described acceleration transducer is for measuring isolating switch casing vibration signal, described trigger circuit are sampled in order to trigger DSP external interrupt, described dsp system is in order to carry out AD sampling, data processing send data to ARM system by SPI, described ARM system is in order to the data that receive DSP and send and process data, preserve and be presented on touch display screen, described ARM system also comprises judge module, in order to judge that circuit-breaker status is whether normal and result to be shown on touch display screen.When isolating switch being detected, first degree of will speed up sensor is installed on isolating switch cabinet top, two input ends of trigger circuit are connected in breaker closing coil and switching winding two ends respectively, now make isolating switch work, casing can produce vibration, acceleration transducer and trigger circuit obtain signal simultaneously and start working, because acceleration transducer is connected with signal processing module, the chip model that the signal processing module of this system uses is CM3502, the chip model of acceleration transducer is CA-YD-180, described signal processing module for acceleration transducer provide constant-current supply simultaneously degree of will speed up sensor export be superimposed upon interchange in direct current (DC) bias by acceleration signals by CR high pass every straight output, every falling direct current (DC) bias, interchange acceleration signal is transmitted to dsp system, , simultaneously due to the triggering of trigger circuit, the external interrupt of dsp system produces negative edge and becomes low level, DSP enters Sampling interrupt and carries out data sampling, the simulating signal collected used AD in the sheet of DSP to carry out analog to digital conversion and convert digital signal to, DSP is again to digital signal 3 layers of WAVELET PACKET DECOMPOSITION that to carry out with DB4 small echo be base, obtain the Energy-Entropy of 8 sequences, obtain 8 entropy as characteristic quantity, DSP carries and the characteristic quantity obtained is sent data to ARM system by SPI, backstage is entered interruption by the SPI driver module in ARM system after SPI receives data, the characteristic quantity of automatic preservation vibration signal, and characteristic quantity is shown on touch display screen, maintainer compares according to the characteristic quantity of the isolating switch that the characteristic quantity that touch display screen shows records with the isolating switch under the normal condition detected in the past, draw the state of this isolating switch, before characteristic quantity being judged in ARM system, once must train SVM algorithm of support vector machine, first many group same model isolating switchs combined floodgate vibr ation signals sample is in normal state collected according to above method, be labeled as normal sample, the type of SVM is set to one-class-svm, and with this group sample training, without the need to again training after having trained, only the characteristic quantity newly recorded need be sent in SVM support vector machine and judge, be judged as similar, then isolating switch is normal, be judged as non-similar, then isolating switch then possible breakdown, result is shown on touch display screen simultaneously, maintainer can find out the state of isolating switch very intuitively on native system, without the need to carry out extra contrast or calculating and this cover system based on embedded system, requisite space is little, man-machine interaction is friendly, easy access personnel judge working state of circuit breaker, extend isolating switch serviceable life, and maintainer detects data before can being consulted by touch-screen, man-machine interaction is friendly.
In addition, above-mentioned two cover systems also can use outside AD sampling A/D chip, AD sampling A/D chip has multiple, the chip model herein adopted is AD7606, described A/D chip is connected between displacement transducer and dsp system, and generally, in the sheet of DSP, AD precision is 8 or 10, and AD7606 can reach 16, make AD conversion more accurate.The dsp chip that native system adopts is TMS320F28335, and this chip possesses 32 floating point processing units, and compared with fixed DSP in the past, the precision of this device is high, and cost is little, and power consumption is little, and performance is high, and peripheral hardware integrated level is high, data and the advantage such as program memory space is large.The ARM chip that native system adopts is S3C6410, than ARM system in the past, has higher dominant frequency and more enriches peripheral hardware, can be applicable to embedded system application scenario performance and processing power being had to requirements at the higher level.
And, trigger circuit described in above-mentioned two cover systems comprise resistance and light coupling relay, light coupling relay model used herein is TLP3553, the input end of described light coupling relay is in series with a resistor is parallel to closing coil and switching winding two ends respectively afterwards, output contact two ends are connected with external interrupt pin with the power supply of DSP respectively, light coupling relay does not have the life-span, LEDs ON ends, reception diode ON-OFF, can not break down because of aging, therefore light coupling relay is applicable to repeatedly the field of switch.
The present invention also introduces a kind of isolating switch casing vibrational state acquisition method, when isolating switch receives separating brake or reclosing command, obtain voltage with the resistance light coupling relay branch road two ends of divide-shut brake coils from parallel connection of coils simultaneously, light coupling relay output contact is closed makes DSP obtain signal, DSP external interrupt produces negative edge and becomes low level, dsp system provides sampling clock for outside A/D chip and reads the vibration signal after its analog to digital conversion, after sampling, if breaker closing, then DSP is to vibration signal 3 layers of WAVELET PACKET DECOMPOSITION that to carry out with DB4 small echo be base, obtain 8 sequences, ask the Energy-Entropy of these 8 sequences respectively, 8 entropy obtained are as characteristic quantity, DSP sends data to ARM system by SPI again, backstage is entered interruption by the SPI driver module in ARM system after SPI receives data, automatically its characteristic quantity is preserved, and characteristic quantity is shown on touch display screen, the method can make maintenance person observe the characteristic quantity of isolating switch casing vibrational state very intuitively, use simple and measuring accuracy is high, this characteristic quantity and the isolating switch characteristic quantity under the normal condition in the past recorded only need compare by maintenance person, the state of this isolating switch can be drawn.
Introduce a kind of isolating switch casing vibrational state determination methods in addition, when isolating switch receives separating brake or reclosing command, obtain voltage with the resistance light coupling relay branch road two ends of divide-shut brake coils from parallel connection of coils simultaneously, light coupling relay output contact is closed makes DSP obtain signal, DSP external interrupt produces negative edge and becomes low level, dsp system provides sampling clock for outside A/D chip and reads the vibration signal after its analog to digital conversion, after sampling, if breaker closing, then DSP is to vibration signal 3 layers of WAVELET PACKET DECOMPOSITION that to carry out with DB4 small echo be base, obtain 8 sequences, ask the Energy-Entropy of these 8 sequences respectively, 8 entropy obtained are as characteristic quantity, DSP sends data to ARM system by SPI again, backstage is entered interruption by the SPI driver module in ARM system after SPI receives data, automatically its characteristic quantity is preserved.Before its characteristic quantity is judged, once must train SVM algorithm of support vector machine, first collect many group same model isolating switchs combined floodgate vibr ation signals sample in normal state according to above method, be labeled as normal sample; The type of SVM is set to one-class-svm, and with this group sample training.After having trained, the characteristic quantity newly recorded is sent in SVM support vector machine and judges, and result is shown on touch display screen, this method directly can draw the state of isolating switch by observing touch display screen, use simple and test accurately, be beneficial to maintainer and check breaker mechanic property, extend isolating switch serviceable life, and maintainer detects data before can being consulted by touch-screen, man-machine interaction is friendly.
Further, the combined floodgate vibr ation signals sample under described normal condition is no less than 30 groups, and vibr ation signals sample obtains more multipotency makes the combined floodgate vibr ation signals under normal condition more accurate, and the circuit-breaker status that is detected can be made more accurate simultaneously.
Above-described specific embodiment; object of the present invention, technical scheme and beneficial effect are further described; be understood that; the foregoing is only specific embodiments of the invention; be not limited to the present invention; within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. isolating switch casing vibrational state acquisition system, it is characterized in that: comprise acceleration transducer, signal regulating device, trigger circuit, SPI, dsp system and ARM system, described acceleration transducer is connected with Signal-regulated kinase, the output terminal of Signal-regulated kinase is connected with dsp system, dsp system is connected with ARM system by SPI, the output contact two ends of described trigger circuit are connected with external interrupt pin with the power supply of dsp system respectively, also comprise touch display screen, described touch display screen is connected with ARM system;
Described acceleration transducer is for measuring isolating switch casing vibration signal, described trigger circuit are sampled in order to trigger DSP external interrupt, described dsp system is in order to carry out AD sampling, data processing send data to ARM system by SPI, and described ARM system is in order to the data that receive DSP and send and process data, preserve and be presented on touch display screen.
2. isolating switch casing vibrational state acquisition system as claimed in claim 1, it is characterized in that: also comprise the AD sampling A/D chip be connected between Signal-regulated kinase and dsp system, the model of described AD sampling A/D chip is AD7606, dsp chip model in described dsp system is TMS320F28335, and the model of the ARM chip in described ARM system is S3C6410.
3. isolating switch casing vibrational state acquisition system as claimed in claim 1, it is characterized in that: described trigger circuit comprise two groups of resistance and light coupling relay, described two groups of resistance are connected on light coupling relay two input end respectively.
4. isolating switch casing vibrational state judges system, it is characterized in that: comprise acceleration transducer, signal regulating device, trigger circuit, SPI, dsp system and ARM system, described acceleration transducer is connected with Signal-regulated kinase, the output terminal of Signal-regulated kinase is connected with dsp system, dsp system is connected with ARM system by SPI, the output contact two ends of described trigger circuit are connected with external interrupt pin with the power supply of dsp system respectively, also comprise touch display screen, described touch display screen is connected with ARM system;
Described acceleration transducer is for measuring isolating switch casing vibration signal, described trigger circuit are sampled in order to trigger DSP external interrupt, described dsp system is in order to carry out AD sampling, data processing send data to ARM system by SPI, described ARM system is in order to the data that receive DSP and send and process data, preserve and be presented on touch display screen, described ARM system also comprises judge module, in order to judge that circuit-breaker status is whether normal and result to be shown on touch display screen.
5. isolating switch casing vibrational state as claimed in claim 4 judges system, it is characterized in that: also comprise the AD sampling A/D chip be connected between Signal-regulated kinase and dsp system, the model of described AD sampling A/D chip is AD7606, dsp chip model in described dsp system is TMS320F28335, and the model of the ARM chip in described ARM system is S3C6410.
6. isolating switch casing vibrational state as claimed in claim 4 judges system, and it is characterized in that: described trigger circuit comprise two groups of resistance and light coupling relay, described two groups of resistance are connected on light coupling relay two input end respectively.
7. isolating switch vibrational state acquisition method, it is characterized in that: when isolating switch receives separating brake or reclosing command, obtain voltage with the resistance light coupling relay branch road two ends of divide-shut brake coils from parallel connection of coils simultaneously, light coupling relay output contact is closed makes DSP obtain signal, DSP external interrupt produces negative edge and becomes low level, dsp system provides sampling clock for outside A/D chip and reads the vibration signal after its analog to digital conversion, after sampling, if breaker closing, then DSP is to vibration signal 3 layers of WAVELET PACKET DECOMPOSITION that to carry out with DB4 small echo be base, obtain 8 sequences, ask the Energy-Entropy of these 8 sequences respectively, 8 entropy obtained are as characteristic quantity, DSP sends data to ARM system by SPI again, backstage is entered interruption by the SPI driver module in ARM system after SPI receives data, automatically its characteristic quantity is preserved, and characteristic quantity is shown on touch display screen.
8. isolating switch casing vibrational state determination methods, it is characterized in that: when isolating switch receives separating brake or reclosing command, obtain voltage with the resistance light coupling relay branch road two ends of divide-shut brake coils from parallel connection of coils simultaneously, light coupling relay output contact is closed makes DSP obtain signal, DSP external interrupt produces negative edge and becomes low level, dsp system provides sampling clock for outside A/D chip and reads the vibration signal after its analog to digital conversion, after sampling, if breaker closing, then DSP is to vibration signal 3 layers of WAVELET PACKET DECOMPOSITION that to carry out with DB4 small echo be base, obtain 8 sequences, ask the Energy-Entropy of these 8 sequences respectively, 8 entropy obtained are as characteristic quantity, DSP sends data to ARM system by SPI again, backstage is entered interruption by the SPI driver module in ARM system after SPI receives data, automatically its characteristic quantity is preserved, before its characteristic quantity is judged, once must train SVM algorithm of support vector machine: first collect many group same model isolating switchs combined floodgate vibr ation signals sample in normal state according to above method, be labeled as normal sample, the type of SVM is set to one-class-svm, and with this group sample training, after having trained, the characteristic quantity newly recorded is sent in SVM support vector machine and judges, and result is shown on touch display screen.
9. isolating switch casing vibrational state determination methods as claimed in claim 8, is characterized in that: the combined floodgate vibr ation signals sample under described normal condition is no less than 30 groups.
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| CN109343401A (en) * | 2018-10-22 | 2019-02-15 | 正知（上海）智能技术有限公司 | A kind of human-computer interactive control system and explosion-proof tank based on ARM |
| CN112737920A (en) * | 2020-12-16 | 2021-04-30 | 交通运输部南海航海保障中心广州通信中心 | Multi-party instant messaging system based on audio energy detection |
| CN112737920B (en) * | 2020-12-16 | 2022-10-04 | 交通运输部南海航海保障中心广州通信中心 | Multi-party instant messaging system based on audio energy detection |
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Application publication date: 20160323 |