동력 경운기용 디젤기관 카운터 발란스축의 질량 및 위치 변화에 따른 진동 = The vibration of Diesel Engine for Power Tiller by Changing the Position and Mass of Counter Balance Shaft

다국어 초록 (Multilingual Abstract)

This study was conducted to evaluate the characteristics of the vibration of diesel engine for power tiller through the modification of counter balance shaft and the optimum condition of counter balance shaft was also found to provide the fundamental data that could be used to reduce the vibration of the engine.
To evaluate the characteristics of the vibration by changing the position and mass of counter balance shaft, the acceleration in three dimensional directions was monitored for three different positions and five different masses of the counter balance shaft under the motor driven condition.
The results obtained are summarized as follows:
1. The acceleration in X,Y and Z direction was increased with the engine revolution by change of the position and mass of counter balance shaft.
2. The acceleration in each direction was shown as Y direction> X direction > Z direction regardless of the position and mass of counter balance shaft.
3. When the mass of counter balance shaft was reduced from the existing mass(D) to the theoretical mass(D), the acceleration as rated engine speed was reduced by 0.07~0.12G in X direction, 0.05~0.23G in Z direction, Hence it is desirable to reduce the weight of the existing counter balance shaft by 13~20 gr.
4. The acceleration of Y direction at each counter balance shaft position was almost the same regardless of the mass of counter balance shaft. The acceleration of the position II in X direction and the position III in Z direction were smaller than those of position I by 30% at 2200rpm, respectively. However, with the aspect of adaptation, it is considered that the case of position III is most desirable.
5. Since vibrations of the engine could be occurred by various factors, it is necessary to continue researches on the relationship among complex factors of the vibration.