Hello, I am attempting to simulate the operating mechanism of an internal combustion engine in order to investigate the influence of engine-induced vibrations on the components mounted to it.
The simulation framework is organized into simplified blocks, as shown in the attached figure. The engine is modeled as an inline six-cylinder engine following the tutorial below:
https://2022.help.altair.com/2022/hwsolvers/ms/topics/tutorials/mv/tut_mv_1015_combustion_force_modeling_spline3d.htm#task_crt_3dy_thb
A bushing is defined between the engine and the ground body, and no joints are used to constrain the engine to the ground body; the engine is supported solely by the bushing.
I ran a trial simulation in which Joint 2 was deactivated, and the results show that the engine vibrates and oscillates. However, in the real system, the muffler is rigidly connected to the chassis via a bolt. Therefore, I defined Joint 2 as a fixed joint between the ground body and the muffler. With this configuration, the simulation results show that the system remains stationary with no oscillation.
I believe that even with Joint 2 fixed, the system should still exhibit some level of vibration rather than being completely static. Therefore, I would like to ask whether defining Joint 2 as a fixed joint between the muffler and the ground body realistically represents the actual system?.
