플라이휠 重量이 디젤 機關의 振動에 미치는 影響 = Effect of Flywheel Weight on the Vibration of Diesel Engine

다국어 초록 (Multilingual Abstract)

Most of small size diesel engines are widely used with the same size and weight flywheel in the levels of 6.0kW and 7.5kW.
This study was conducted to obtain basic data which affect the engine performance of the power tiller. The flywheel weight was considered as a major factor in this research.
Basically, fuel consumption ratio. motoring loss, torque, vibration and mechanical efficiency of the engine were measured and analyzed on four levels of flywheel weight. 32.2, 29.4, 26.2 and 24.2kg_f, respectively.
Results were obtained as follows:
1. The weights of flywheel were 23.7kg_f from design program of JSME and 24.5kg_f from ASME and SAE design criteria. Therefore, the flywheel weight of 32.2kg_f might be reduced about 8kg_f in 7.5kW engine.
2. The rated outputs of 6.0kW and 7.5kW engine were actually 7.43kW and 7.85kW, respectively. When flywheel weight was reduced from 32.2kg_f to 24.2kg_f, outputs were increased from 7.43kW to 7.70kW in 6.0kW engine and from 7.85kW to 8.25kW in 7.5kW engine,
3. When the flywheel weight was reduced from 32.2kg_f to 24.2kg_f, fuel consumption ratio was decreased from 300.8 to 296.8g/kW-hr in 6.0kW engine and also from 313.6 to 312.8g/kW-hr in 7.5 kW engine, respectively.
4. When the flywheel weight was reduced from 32.2kg_f to 24.2kg_f, mechanical efficiency of engine was increased from 76.1% to 76.8% in 6.0kW engine and also from 76.7% to 77.0% in 7.5kW engine, respectively.
5. When the flywheel weight was reduced from 32.2kg_f to 24.2kg_f, vibration was decreased at X-axis and Z-axis in 6.0kW engine, however, slightly increased at Y-axis in 6.0kW engine and at all axes in 7.5kW engine.
6. When the flywheel weight was reduced from 32.2kg_f to 24.4kg_f motoring loss was decreased from 2.33kW to 1.75kW in 6.0kW engine and also from 2.46kW to 1.84kW in 7.5kW engine