Abstract
The vibration transmission in engine structures was studied, combining the theoretical approach formulated by Statistical Energy Analysis (SEA) and the experimental measurements of mechanical mobility (inverse of impedance) and damping. An analytical model of the energy flow between different engine components was used to identify means of changing the dynamic characteristics of various components and covers in order to reduce the vibration level and thereby reduce the radiated noise. Approximations were made to the SEA equations for the vibrational energy transfer between coupled structures in order to relate the coupling factors in the analytical model to experimentally measurable point mobilities. Mobility and damping measurements were made on three truck diesel engines. The component vibration levels predicted by the analytic model were compared with those measured when the engines were operating and generally good agreement was found. The model was then used to identify means of reducing the component vibration levels through improving the isolation and/or damping of the components. [Work supported by DOT Contract No. DOT‐TSC‐1013.]
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