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6073 results about "Normal state" patented technology

Pump potential cavitation fault detecting method based on quick spectrum kurtosis analysis

The invention discloses a pump potential cavitation fault detecting method based on quick spectrum kurtosis analysis. The pump potential cavitation fault detecting method comprises the steps that 1, vibration acceleration signals are collected to be subject to noise reduction to serve as to-be-processed signals; 2, according to the data size of the signals, the resolving order of signal processingis determined; 3, according to the quick spectrum kurtosis algorithm computation result, the optimal carrier frequency and bandwidth are selected; 4, the selected signals within the carrier frequencyand bandwidth are subject to Fourier transformation, and a frequency spectrum envelope diagram is obtained; and 5, an original signal time domain figure, a signal time domain figure treated through quick spectrum kurtosis filtering processing and the frequency spectrum envelope diagram obtained after selected zone Fourier transformation are compared, and cavitation trouble signal time and frequency characteristics are analyzed. By means of the method, more cavitation instant signals can be detected, information in the aspects of time domain and frequency domain is seen more clearly, and the normal state and the cavitation state of a pump can be distinguished obviously.
Owner:ZHEJIANG UNIV

State detecting device and system and method for feeding back states of intelligent home system

The invention discloses a state detecting device and a system and device for feeding back states of an intelligent home system. The system for feeding back the states of the intelligent home system comprises an intelligent home gateway, and further comprises the state detecting device, wherein the intelligent home gateway is used for storing states of lamplight, curtains and some household appliances and for storing various control strategies corresponding to the states. The state detecting device is used for detecting the states of the lamplight, the curtains and some household appliances in the intelligent home system, when the normal states are judged, the state detecting device sends information including a normal state signal to the gateway, and when the abnormal states are judged, the state detecting device sends information including an abnormal state signal to the gateway. At the time, when receiving the information including the normal state signal, the gateway stores the information including the normal state signal in a database to be inquired by a user, and when receiving the information including the abnormal state signal, the gateway stores the information in the database to be inquired by the user and pushes the information to a user terminal in an emergency information sending mode or in a short message sending mode. The state detecting device and the system and device for detecting the states are reliable to achieve, and the states are truly visible.
Owner:崔海伟

Rail traffic real-time fault diagnosis method and system based on data comparative analysis

The present invention relates to a rail traffic real-time fault diagnosis method based on data comparative analysis and a rail traffic real-time fault diagnosis system based on data comparative analysis. The method comprises the steps of (1) collecting the historical monitoring data and real-time monitoring data of rail traffic signal equipment, (2) according to the correlation relationship between the parameters of the historical monitoring data, obtaining a comparative analysis model of a normal state and a fault state, (3) according to the comparative analysis model of the fault state, generating the classification model of fault through classifier training, (4) for the real-time monitoring data, judging the normal state or abnormal state of equipment operation through the comparative analysis model, and carrying out fault alarming if the state if the abnormal state, (5) for the data of the abnormal state, carrying out fault diagnosis and classification through a fault analysis model, and outputting a fault diagnosis result. According to the method and the system, the fault of the equipment is diagnosed through classification and comparative analysis methods, and the problems of heavy workload, low efficiency and high risk in the artificial diagnosis of a railway signaling system failure are effectively solved.
Owner:BEIJING TAILEDE INFORMATION TECH

Seal housing having anti-inversion features

InactiveUS7591802B2Avoid excessive wearFacilitates over-center positioningEar treatmentCannulasDiaphragm sealEngineering
The invention is directed to a trocar adapted to form a seal around a surgical instrument, the trocar comprising a cannula having an axis extending between a proximal end and a distal end; a housing having a proximal wall and forming with the cannula a working channel sized and configured to receive the instrument; a septum seal disposed in the housing and extending transverse to the axis of the cannula across the working channel, the septum seal having a normal state when the instrument is absent from the working channel and a stretched state when the instrument is being withdrawn from the working channel; portions of the proximal wall of the housing defining an orifice sized and configured to receive the instrument into the working channel; and an elastomeric ring-shaped projection extending axially distally between the proximal wall and the septum seal, the ring-shaped projection having an axial length adapted to deform to prevent inversion and binding of the septum seal and the orifice upon withdrawal of the surgical instrument. In particular, the septum seal is prevented from reaching the orifice in the proximal wall of the housing when the instrument is withdrawn. The projection may be bonded, insert-molded, or compressively fitted to the proximal wall of the housing. The projection may be formed of an elastomeric material such as natural or synthetic rubber. The projection may further comprise a plurality of portions or fingers extending axially distally from the proximal wall, each of the extending portions or fingers may further include a living hinge. In another aspect, the ring-shaped projection may be formed on the surface of the septum seal instead of the proximal wall of the housing. That is, the ring-shaped projection may be formed to extend axially proximally from the surface of the septum seal toward the proximal wall of the housing.
Owner:APPL MEDICAL RESOURCES CORP

Multi-parameter identification based secondary system fault diagnosing method for intelligent substation

The invention discloses a multi-parameter identification based secondary system fault diagnosing method for an intelligent substation. The multi-parameter identification based secondary system fault diagnosing method is mainly applicable to digital substation accordant with IEC61850 communication protocol. The method includes: comprehensively analyzing multi-dimensional parameters including various alarm information, telemeasuring data, telecommand states and the like of a process layer, a spacer layer, a station control layer through a network message recording and analyzing device, monitoring states of secondary devices in real time by utilizing original messages as analysis data and utilizing recording of transient state of device exception and long-term monitoring of operation states as means, and realizing fault diagnosis and state monitoring of the secondary system of the intelligent substation. The multi-parameter identification based secondary system fault diagnosing method for the intelligent substation has the advantages in two aspects including that normal states of the secondary device of the intelligent substation can be monitored, background data and maintenance reference are provided for state maintenance; exception states are identified, quick fault diagnosis is realized, effective instruction can be provided for transport maintenance, and convenience in maintenance of the substation is improved.
Owner:STATE GRID CORP OF CHINA +3

Controller redundancy and switching method

The invention discloses controller redundancy and a switching method. The method is used for the redundancy switching logic between an industrial controller main machine and a spare machine. Calculation and output synchronization between the main machine and the spare machine is guaranteed, and rapid undisturbed switching is achieved when the main machine fails. A switching circuit is composed of two pairs of GPIO control lines and a 100M Ethernet. Through recognition of low level states, pulse signal states and high level states of IOs, the normal state or the failure state of the opposite end controller main machine or the spare machine is obtained, and the normal state or the failure state of the main machine or the spare machine of an opposite end controller can be obtained in a communication mode when the hardware switching circuit fails, so that arbitration and switching of the main machine and the spare machine are achieved. The design method of state machines is adopted, the operation states of the controller are summarized to be five states that the main machine is normal, the main machine fails, the spare machine is normal, the spare machine fails, and opposite ends are powered off, and the arbitration treatment of the main machine and the spare machine is achieved through matrixes of the state machines. The hardware switching circuit and redundant communication serve as connecting signals between redundancy devices, reliability of redundancy switching control is greatly enhanced, and stable operation of an industrial control system can be effectively guaranteed.
Owner:BEIJING SIFANG JIBAO AUTOMATION +1
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