Abstract
Multiple sets of spring, spring seat structures are uniformly arranged in circumferential short spring dual mass flywheel (DMF), which generally have a symmetrical structure. The internal springs and spring seats are constrained by the shape of the primary flywheel and the secondary flywheel. At different rotational speeds, the springs and spring seats have different centrifugal forces. To study the dynamic characteristics of the DMF including torque and stiffness with considering the influence of centrifugal force and friction, the discrete method is used to analyze the mechanical actions of the transmission parts in DMF. The torque action between the spring seat and the secondary flywheel is deduced. The dynamic characteristics of the DMF are obtained through analyzing and calculating. Due to the symmetry of the structure, the torque transmitted and the stiffness of the DMF also have specific symmetrical characteristics. Namely, at two relative rotational angles of the same magnitude and opposite direction, the magnitude of the transmitted torque is the same, the direction is opposite. The magnitude and direction of stiffness are the same. The influence of speed, friction coefficient, spring mass, and spring seat mass on the torque and stiffness characteristics are analyzed. Finally, the theoretical analysis is proved to be valid by the torque characteristics test of DMF.
Highlights
Torsional vibration of the powertrain, which is a common phenomenon in vehicles equipped with an internal combustion engine, is mainly due to the changing output torque of the engine and the crank-link mechanism inertial force
Dual mass flywheel (DMF), which is an efficient torsional vibration damper developed in the 1980s, has been continuously improved and widely adopted in vehicle transmission systems [1,2,3,4,5]
Lü et al [11] developed the analytical expression of the nonlinear elastic characteristics and the calculation formula of the torsional stiffness of a circumferential short spring-type DMF
Summary
Torsional vibration of the powertrain, which is a common phenomenon in vehicles equipped with an internal combustion engine, is mainly due to the changing output torque of the engine and the crank-link mechanism inertial force. The centrifugal force of spring and spring seat at different speeds and friction will affect the interaction forces between spring, spring seat, primary flywheel, and secondary flywheel, thereby affecting the torque and stiffness of the DMF. When designing and analyzing DMF, the influences of friction and centrifugal force of spring and spring seats at different speeds need to be considered. This includes the torque characteristic tests of the DMF for proving the effectiveness of the theoretical analysis. The polar coordinates of point B (RB, θB) can be determined according to Equations (6) and (9)
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