A novel approach has been proposed in understanding and possible eliminating dangerous bending vibrations of high pressure fuel lines of low speed marine diesel engines. Although the theory of vibration of piping systems is rather developed today, the reasons for significant vibrations occurring in high pressure fuel pipes are not completely understood, and require thorough investigation and study. Both analytical and experimental studies performed in order to analyze dependence of diesel engines operational modes on the level of vibration and its properties. Results of numerical studies of the equation of motion of high pressure fuel pipes were obtained using Mathieu-Hill method. Those results were supplemented with data from full-scaled experiments performed on Sulzer 14RT-flex96C low speed main engine onboard of 15550 TEU container vessel Ebba Maersk. It has been proven that oscillations of the fuel in high pressure line, which take place in-between injections at the partial engine load, cause parametric bending vibration, and in some cases parametric resonance. Author has proposed a few methods in order to avoid that.
W artykule zaprezentowano nową metodę zakuwania łbów wysokociśnieniowych przewodów paliwowych do silników wysokoprężnych. Opisano nowy sposób ciernego mocowania materiału wyjściowego w przyrządach typu TR, polegający na przenoszeniu poziomego oporu przyrządu na pionowy zacisk wkładek chwytowych. Przedstawiono przebieg zakuwania 2 typów przewodów, konstrukcję narzędzi oraz wykonane odkuwki. Pozytywny wynik prób technologicznych pozwala na aplikację metody w praktyce przemysłowej.
EN
The paper presents a new method of shutting high pressure fuel pipes for Diesel engines. A new way of frictional fixing of the initial material in the TR type devices consisting in the transformation of the horizontal device resistance to vertical clamp of the gripping inserts has been presented. The process of shutting 2 types of pipes has been described, as well as the tool design and forgings made. The positive result of technological trials allows for the application of the method in industrial practice.
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