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Research on Testing and Analyzing Technology for Time Parameter of Aerospace Relay

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Tutor: WangShuJuan;QiMing
School: Harbin Institute of Technology
Course: Electrical Engineering
Keywords: Aerospace relay,Time parameter,Acoustic emission theory,Wavelet analysis
CLC: TM58
Type: Master's thesis
Year:  2008
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Abstract:
Aerospace relay, including electromagnetic relay, time delay relay and solid state relay, etc., is a kind of hermetical relay which is widely used in the fields of aerospace, industrial automation for control and signal transmission. Aerospace relay is one of the main electronic components in national defense weapon system. Its reliability influences the reliability of the whole system. Time parameter is an important index which can reflect relays¡¯operating characteristic and reliability. Electric parameter can be obtained by analyzing the time parameter so that failure causes could be found. As a consequence, the research on testing and analyzing technology of aerospace relays¡¯time parameter is of great theoretical significance and application value for guaranteeing the reliability of national defense electronic system.This paper analyzes state of the art of testing and analyzing technology of aerospace relay and presents an integrated design scheme of the testing and analyzing system. The system includes a sound signal acquisition circuit, a data acquisition card based on PCI bus and a delay time test card based on ISA bus.The software of the system is based on the platform of Windows 2000 operation system and it analyzes coil current, contact voltage and sound signal by Visual C++ language. Based on modular programming method and virtual device technology, the software system can save, inquiry, and print the data, and it has a favorable interface as well.This paper proposes a method of combining the electric parameter test and the acoustic emission test to analyze free travel time of the electromagnetic relay. The system tests the neutral position of latching relay using the impulse width changing method. Wavelet transform method is introduced as a new signal-processing tool in the coil current signal analysis to obtain the armature actuation time. Experiments verify the validity of the proposed methods, and the system has high testing accuracy.
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