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Compared with four-stroke engines, single-cylinder two-stroke engines have the characteristics of small inertia, high rotational speed, and wide excitation frequency range. However, the structural vibration and noise generated by the two-stroke engine are very violent. Hence, it is necessary to reduce the vibration and noise of the single-cylinder...
Citations
... Many achievements have been made in the research on automobile powertrain system dynamics. The core idea of dynamics and optimization design of automobile engine powertrain and its mounting system is to realize the reasonable distribution of powertrain modal frequency and the modal decoupling of the mounting system under excitation, to reduce the vibration transmission rate between the powertrain and the frame, etc. [4][5][6]. Only rigid-body modes of the powertrain are considered, the torque roll axis (TRA) decoupling dynamics equation was established by Jeong and Singh [7], and the spatial multi-point mounting schemes of an automotive engine gearbox system with oscillating torques excitation was obtained. ...
This paper presents the dynamic characteristics analysis of a rigid body system with spatial multi-point elastic supports, as well as the sensitivity analysis of support parameters. A rigid object is characterized by six degrees-of-freedom (DOFs) motions and considering the spatial location vector decomposition of elastic supports, a rigid body system dynamic model with spatial multi-point elastic supports is derived via the Lagrangian energy method. The system modal frequencies are calculated, and to be verified by finite element modal analysis results. Next, based on the above-mentioned model, system modal frequencies are obtained under different support locations, where the support stiffness components are different. Interpolate the stiffness components corresponding to each support location, calculate system modal frequencies, and the response surface model (RSM) for system modal frequencies is established. Further, based on the RSM modal analysis results, the allowable support location for the system modal insensitive area can be obtained. At last, a lubricating oil-tank system with four supports is taken as an example, and the effects of support spatial locations and stiffness components on the system inherent characteristics are discussed. This present work can provide a basis for the dynamic design of the spatial location and stiffness for this type of installation structures.
