Dynamics and Vibration Measurements in Engines

Vibrations lead to fatigue failure or damage which is harmful to engine supporting structures. The impact introduces large forces and thus large stresses, which can cause both vibrations and early failure of the mechanisms. Our objective in this work was to show the effectiveness of engine support and effect of looseness on the structural vibrations. To minimize the possible problems associated with engine vibration, a robust and accurate design of support is needed which includes bolted joints. To reduce the engine vibrations proper mounting must be provided. Sometimes dampers at the interface of the engine and foundation are required. The internal combustion engine is the concentrated mass and if not properly supported, it will cause vibrations and will be transferring to the supporting structures. Damping is difficult to model out, so our focus was on to the stiffness as a parameter for this research by direct measurement of vibration values near the resonance conditions. Results of this paper will enable the designer an easy way to adjust the stiffness parameter by tightening of bolts to the supports, which helps in reducing the overall vibration and noise level.