Theoretical and experimental investigation of arc springs used indual-mass flywhell

In this study, dynamic behavior of are springs used in dual-mass flywheel technology are investigated. First, mathematical models are established to determine the torsional stiffness of arc springs with circular and rectangular wire profiles. Experimental tests are performed to verify these models and it is observed that the obtained test results are compatible with the established models. The necessary equipment related to the test bench that should be used to find the stiffness is mentioned and information about the interpretation of these obtained test results is also given. Then the springs are modeled in three dimensions and a certain amount of torque is applied by fixing a supportive shell on the outside, and finite element analyzes are performed under real operating conditions. The torsional stiffness and von-Mises stress in case of block angle of springs are obtained from simulations and the results are shared. Although the selected circular cross section spring has a smaller stiffness value, it is observed that the stress value is higher than that of the rectangular section spring. As a result, it is shown that rectangular cross section springs can provide low stress for dual mass flywheels in certain situations. In addition, the masses of two springs that can be used on the same flywheel are compared. At the same torsional stiffness, a 9.44% lighter design is obtained for rectangular cross section springs and the results are shared. Finally, the effects of design parameters on torsional stiffness are investigated. The outputs of all this work can be good references for manufacturers to interpret dual-mass flywheel springs numerically and experimentally.