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HỘI THẢO QUỐC TẾ ATiGB LẦN THỨ CHÍN - The 9 ATiGB 2024 61

Table 3. Input Parameters of the Figure 4 shows the P-α graph of the engine.
Engine After Modification Analysis of the P-α graph reveals a significant
improvement in the peak pressure within the
No. Parameter Value Unit Symbol
combustion chamber after modification. Specifically,
1 Effective power 4,77 kW N e at a crank angle of 372 degrees, the maximum pressure
2 Compression Ratio 10 V (Pmax) before modification was 4.801 MPa, whereas the
3
3 Cylinder Volume 183 cm V h modified version achieved 5.7284 MPa. This indicates
Adiabatic Expansion Index of a more efficient combustion process, with a more
4 1,45 m complete burn of the ammonia-air mixture, resulting in
Residual Gas
5 Heat Utilization Coefficient at z 0,85 x z higher pressure in the combustion chamber.
6 Heat Utilization Coefficient at b 0,89 x b 2.4. Piston-Connecting Rod-Crankshaft Durability
Testing
7 Pressure Increase Coefficient 3,45 l
After completing the piston design, the durability
8 Additional Charge Coefficient 1,07 l 1
testing process is crucial to ensure the product meets
9 Scavenging Coefficient 1 l 2 performance and safety requirements. SolidWorks
software was used to simulate stress, displacement,
Correction Coefficient for Specific safety factor, and temperature of the piston under
10 1,1 l t
Heat
various operating conditions.
11 Graph Filling Coefficient 1 j đ
In the calculation and analysis process, the authors
The engine modifications resulted in significant determined the maximum pressure to be pz=6,873 MPa.
improvements, such as increased combustion chamber This is the maximum pressure exerted by the gas on the
pressure, gas force, torque, and engine power. At the pz.π.
2
same time, the stability of the inertia forces post- piston top. Using the formula F= 4 , the resulting
modification helped reduce vibrations, wear, and force was F=27.983,44754 N. This force represents the
extended the lifespan of the piston, crankshaft, and maximum load the mechanism must withstand during
connecting rod. The modifications not only enhanced maximum power operation.
performance but also ensured stability and durability
during operation, as illustrated in Figure 3.

Figure 5. Structural Mesh

Figure 3. Graphs of Pkt, Pj, P

Figure 6. Simulation and Durability Testing of the
Piston, Crankshaft, and Connecting Rod
a) Stress; b) Displacement;
Figure 4.Graph of P-anpha c) Strain Index; d) Safety Factor.

ISBN: 978-604-80-9779-0