| Summary: | The demand for high-temperature-resistant metal rubber seals (MRSs) with a large ring-to-diameter ratio is increasing. In this work, an O-type MRS with a large ring-to-diameter ratio was developed by embedding a spiral network metal rubber into a stainless-steel ring with a special preparation process. The effects of the frequency, porosity, and amplitude on the dynamic performance of this O-type MRS were studied in detail. The mechanical properties of the MRS were characterized through dynamic tests, and the damping sensitivity was analyzed using orthogonal tests. The results show that the MRS has a better stability under different vibration frequencies. The energy consumption and loss factor of the sample increase with increasing porosity. With an increase in the loading amplitude, the energy consumption and loss factor of the test samples with the same porosity increase, whereas the dynamic average stiffness of the specimen gradually decreases. Furthermore, the range analysis of the orthogonal experiment shows that the factors affecting the damping performance of the seal are in the following order: porosity > amplitude > frequency. This study presents the dynamic mechanical properties of O-shaped MRSs with a large ring-to-diameter ratio and provides a foundation for their engineering application.
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