Class 1 (Chief Engineer) Engineering Management 📅 Jun 2022

Exam Question

Marine two stroke slow speed engines are subjected to forces that may influence hull. Explain following with suitable sketches, how such influences can be minimized.

(a) External unbalanced moments

(b) Guide force moments

(d) Torsional vibration in the shaft system

Reference Answer

### Introduction
Marine two-stroke slow-speed engines, due to their immense size, mass of moving parts, and high power output, generate significant forces and vibrations. These phenomena, if not properly managed, can be transmitted to the ship's hull, leading to structural fatigue, reduced equipment lifespan, and poor habitability conditions. Effective mitigation involves a combination of inherent design features and supplementary equipment.
### (a) External Unbalanced Moments
**1. Concept and Generation:**

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