Effect of bell plate structure on high- and low-frequency characteristics of hydraulic mount

Abstract

This study introduces a novel hydraulic mount designed to achieve broad-spectrum engine vibration isolation. While previous studies have focused on vibration isolation using hydraulic mounts, there is a scarcity of research on achieving wideband vibration isolation with such mounts. To address this gap, this article proposes a new bell plate hydraulic mount structure that includes an inertia channel, a decoupler membrane, and two bell plates. First, the study analyzes the impact of structural parameters on the dynamic characteristics of the new bell plate hydraulic mount across high and low frequencies. Second, it compares how varying the number of bell plates affects the hydraulic mount’s dynamic behavior across different frequency ranges. The findings reveal the following key points: (1) The number of bell plates has minimal influence on the low-frequency dynamic characteristics of the hydraulic mount. (2) Increasing the number of high-frequency bell plates from n = 0 to n = 2 reduces the peak dynamic stiffness of the hydraulic mount by 69.88% and decreases the hysteresis angle by 37.71%. (3) At higher frequencies, the dynamic characteristics of the hydraulic mount are notably influenced by parameters such as the equivalent cross-sectional area A m2 of the second bell plate, the surrounding equivalent cross-sectional area of the hole A t2, and the fluid inertia coefficient I t2 associated with bell plate 2.

Keywords

• hydraulic mount
• new bell plate hydraulic mount
• dynamic characteristics
• bell plate