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16 results on '"Demjanenko, V."'

3. Event timing and shape analysis of vibration bursts from power circuit breakers

Author

Polycarpou, A.A., Soom, A., Swarnakar, V., Valtin, R.A., Acharya, R.S., Demjanenko, V., Soumekh, M., Benenson, D.M., and Porter, J.W.

Subjects
Electric circuit-breakers -- Research, Electric power systems -- Maintenance and repair, Vibration -- Control, Business, Computers, Electronics, Electronics and electrical industries
Abstract

Noninvasive vibration diagnostic techniques are implemented to assess the mechanical condition of power circuit breakers. A diagnostic system, the Prototype Commercial Portable Diagnostic System (PCPDS) has been developed. Hardware of the PCPDS includes a portable computer, and a data acquisition unit and computer communication canis. Signal processing techniques include the discrete energy statistics envelope, short-time power spectrum, tinting extraction algorithm and chi-square based shape test. Decision-making is carded out via a voter program, to which individual results from the timing and shape analysis programs are passed. Statistical and empirical thresholds have been established, that classify the circuit breaker as being in Normal-Transitional-Abnormal (Green-Yellow-Red) condition.

Published
1996

13. Computer Controlled Voltage Clamp

Author

Demjanenko, V. and Sachs, F.

Subjects
Data Acquisition Systems, Data Capture Devices, Laboratories, Scientific Research, Minicomputer
Published
1983

15. Three Chips Synchronize DMA Operations

Author

Demjanenko, V.

Subjects
Circuit Design, Direct Memory Access, Channels, Circuitry, I/O Management, Business, Computers and office automation industries, Electronics and electrical industries
Abstract

Described is a synchronizer and sequencer circuit that can accurately synchronize several microprocessors in a system that utilizes direct memory access (DMA). The circuit consists of only three chips, and in the examples discussed, the unit is working in conjunction with a Z80 system. A schematic is provided.

Published
1984

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