Modeling and experimental validation of lever-based electromechanical actuator for dry clutches

Abstract

A new motor-driven lever-based servo actuator is proposed for automatic manipulation of dry clutches. The dynamic model considering the negative stiffness of the diaphragm spring is built. The characteristics of torque-saving and powersaving are analyzed. Moreover, the stability addressing the negative stiffness is analyzed. The simulation results are verified by the experimental results. The results from quasi-steady experiments show the proposed actuator reduces the motor torque up to 23.9%, the motor power loss up to 38.7%, and the motor output power up to 21.9% compared to the ordinary lever-based actuator. As a whole, the energy consumption during a usual clutch engagement is reduced by 30.1%. In addition, the proposed actuator can track the desired displacement well under the negative stiffness case, and thus overcomes the weakness of the ''Luk-like'' actuator.

Dynamics of the Vibro-Impact Nonlinear Damped and Forced Oscillator under the Influence of the Electromagnetic Actuation

“…Mathematics 2022, 10, x FOR PEER REVIEW 6 of 17 In Equation ( 14), it was considered that the deformation between the solids in contact are elastic, and the contact is maintained, and the dry contact is equivalent with the linear viscous damping. The electromagnetic force can be written as (15) where c0 and l0 are coefficients depending on the geometric characteristics of the actuator and on the current induced in the magnetic circuit, respectively; e is the initial air gap between electromagnet and the rigid mass.…”

“…Three aspects were taken into account in elaborating the development state of electromechanical actuator testing system: performance testing in vacuum environment, iron bird, and testing based on room temperature. Li and Liu [15] explored stability and dynamical behaviors of an electromechanical actuator with nonlinear stiffness in dry clutches. Four bifurcations, two Hopf and two stable points, are found in the unregulated system, and four stable bifurcations are found in the regulated system.…”