Temperature shift on resonance frequency for spark plug ground electrode
Roberto Dardano, Bruno Doimo, Ottino Ivano · Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE · 2002
Basic and applied research in resonance conditions of structures is now an acquired design procedure providing highly reliable results. However, further research is needed on mathematical models to simulate actual operating conditions and define change mode parameter patterns in relation to external conditions such as temperature. The test procedure described here under is designed to aid in the development of such models. A significant number of spark plug specimens are used to review the mechanism of change in spark plug electrode natural frequencies as a function of operating temperature. Spark plug ground electrode resonance frequency and damping may be a critical parameter for the conect operation of the engine. In particularly in the laboratory of Prototipo S.p.A. has been tested, for statistical approach, eight different types of spark plugs, researching the resonance in fixed temperature range (from 6500Cto 8500 C). For the purposes of verify the influence of the temperature on the damping we used other eight different type of spark plug for the two conditions: 750 ° C and 20 °C.