Design and characteristics of MRF-based actuators for torque transmission under influence of high shear rates up to 34,000s-1

Dirk Güth; Vadim Erbis; Markus Schamoni; Jürgen Maas

doi:10.1117/12.2045306

1 April 2014 Design and characteristics of MRF-based actuators for torque transmission under influence of high shear rates up to 34,000s^-1

Dirk Güth, Vadim Erbis, Markus Schamoni, Jürgen Maas

Author Affiliations +

Proceedings Volume 9057, Active and Passive Smart Structures and Integrated Systems 2014; 90572P (2014) https://doi.org/10.1117/12.2045306
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2014, San Diego, California, United States

Abstract

High rotational speeds for brakes and clutches based on magnetorheological fluids represent a remaining challenge for the industrial or automotive application. Beside particle centrifugation effects and rotational speed-depending no-load losses, the torque characteristic is an important property that needs to considered in the design process of actuators. Due to missing experimental data for these operating conditions, in this paper the shear rate and flux depending yield stress behavior of magnetorheological uids is experimentally investigated for high rotational speeds or respectively high shear rates. Therefore a brake actuator with variable shear gap heights up to 4 mm is designed, realized and used for the experimental investigation, which are performed for a maximum shear rate of ƴ= 34; 000 s^-1 under large magnetic elds. The measurement results point out a strong dependency between shear rate, magnetic ux density and resulting yield stress. For low shear gap heights, a significant reduction in the yield stress up to 10 % can be determined. Additionally the development of Taylor vortices is determined, which will not only occur in viscous case without an applied magnetic field. The measurement results are important for a reliable actuator design which should be used in application with high rotational speeds.

Citation Download Citation

Dirk Güth, Vadim Erbis, Markus Schamoni, and Jürgen Maas "Design and characteristics of MRF-based actuators for torque transmission under influence of high shear rates up to 34,000s^-1", Proc. SPIE 9057, Active and Passive Smart Structures and Integrated Systems 2014, 90572P (1 April 2014); https://doi.org/10.1117/12.2045306

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