Dynamic analysis of three-cylinder engine with balancing shaft

Three-cylinder linear engines are designed to minimize, reduce fuel consumption and pollution. The disadvantages of this type of engine, heavy vibration inherent in them. this study aims to balance Three-cylinder linear engines with a balancing shaft. First, the dynamic analysis of these types of engines identifies unbalanced sources. The results of the dynamic analysis showed that the inertial torque due to the reciprocating and rotational masses of three-cylinder linear motors is unbalanced. therefore, dynamic analysis of these types of engines identifies unbalanced sources. The results of the dynamic analysis showed that the inertial torque due to the reciprocating and rotational masses of three-cylinder linear engines is unbalanced. then, the analytical balancing of this type of engines with a balancing shaft was performed. The results of analytical balancing led to the extraction of an equation for the calculation of geometric and mass characteristics as well as the position of the balancing shaft in this type of engines. to test the performance of the balancing act performed analytically, the three-cylinder base motor with its balancing rod was simulated in GT-Power software. the acceleration results of the engines mount were compared between the simulated model and the experimental test and there was a good agreement between them. then, the results of the vibration level of the base engine with the balancing shaft designed analytically were compared with the results of the validated model. The results of the comparison showed that the performed analytical balancing has a good performance. then, the crankshaft correction solution was presented using the balance factor and the possibility of eliminating the balancing shaft to balance the three-cylinder linear engines. to accept balancing in this way, the results of the acceleration level of the driverchr('39')s seat rail are considered as acceptance criteria. The results showed that balancing of three-cylinder linear engines is possible by increasing the balance factor of the crankshaft and removing the balancing shaft.