In the development of Hyundai HiMSEN medium speed diesel engine family, A goal was set to design the new engine with minimum vibration level so as to meet high quality target of the engine. Intensive modeling and calculation works for the simulation and analysis were done in the design stage. From the optimal choice of the firing order to the prediction of vibration responses for the shafting line and engine block, critical features such as natural frequencies, modes, excitations and resonance were reviewed in view of anti-vibration design. Full family of the engine models from 5-cylindered to 9-cylindered engines are scrutinized so as to cover all the product line-ups of H21/32 and H25/33 engines. Along with the simulations various instrumentations are performed for the comparison and verification. Besides the plain vibration measurements modal tests were widely used to identify the dynamic characteristics of the engine components and assembly. Torsional vibration and structural deformation of rotating crankshaft were measured using the laser vibrometer and telemetry system for the prototype engine. The results of tests and measurements are closely reviewed and correlated with analysis results in order to update and enhance the analysis model to ensure better prediction accuracy. Based on the numerous simulations and measurements data the anti-vibration design system has been established. The vibration characteristics and measurement records for most of the engine models are structured in the integrated database system as the valuable reference for anti-vibration design. The system was also used to control the vibration of generator set as the application of HiMSEN engines. Resilient mounts are selected to isolate the vibration and noise effectively and common base-frame which plays a vital role in controlling the structural vibration are carefully designed for optimal vibration condition. Effects of structural modifications of auxiliary parts such as flywheel cover and generator were predicted and applied to suppress the vibration or avoid the resonance.
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