Title: Failure mechanism of high frequency electromechanical horn induced by cyclic intermittent arc behaviour

Authors: Jifeng Guo; Ahui Chen; Wanbin Ren

Addresses: College of Information and Computer Engineering, Northeast Forestry University, Heilongjiang, Harbin 150040, China ' College of Information and Computer Engineering, Northeast Forestry University, Heilongjiang, Harbin 150040, China ' Military Apparatus Research Institute, Harbin Institute of Technology, Heilongjiang, Harbin, 150001, China

Abstract: The high frequency electromagnetic (EM) horn with mechanical contacts is a type of energy transducer. It sounds through its diaphragm, which is excited by the high frequency and pulse electromagnetic excitation. The pulse current generated by the high frequency making/breaking actions of mechanical contacts produces electrical arc produced during the process, which brings huge effect on the reliability and electrical life time of the horn. In this paper, the integrated experiment system was designed for the electrical life time of the high frequency EM horn, by which the degradation process of action current, peak value current, contact resistance and time parameters evolved was analysed. The failure reason and mechanism of the horn was discussed. The conclusions are of great value for further improvement of reliability of the EM horn production.

Keywords: high frequency horns; electromechanical horns; intermittent arc; electrical life time; failure mechanism; contact resistance; energy transducers; mechanical contacts; action current; peak value current; contact resistance; time parameters; vehicle electrical appliances; vehicle horns.

DOI: 10.1504/IJVNV.2015.067984

International Journal of Vehicle Noise and Vibration, 2015 Vol.11 No.1, pp.67 - 77

Available online: 10 Mar 2015 *

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