Adaptive magnetorheological shock isolation mounts for drop-induced impacts

作者：Singh Harinder J; Wereley Norman M^*

来源：Smart Materials and Structures, 2013, 22(12): 122001.

DOI：10.1088/0964-1726/22/12/122001

Non-dimensional analysis and optimal control design of adaptive magnetorheological shock isolation (MRSI) mounts are addressed for drop-induced impacts. The governing equation of motion of a single degree-of-freedom under impact was derived, where a magnetorheological energy absorber (MREA), which has controllable stroking load and a passive linear spring, isolate the payload mass from the base that impacts the ground. During the impact event, the payload experiences both a compression and a rebound stroke. During the compression stroke, the payload descends as the MREA dissipates and the spring stores, the energy of impact. During the rebound stroke, the spring releases its stored energy under the control of the MREA. The Bingham number, defined as the ratio of the MREA yield force to its viscous force, is utilized as the control variable. A non-dimensional analysis was conducted using key parameters such as available MREA stroke and Bingham number. The first control objective was to ensure that the payload achieved a soft landing (i.e., comes to rest) at the end of the compression stroke by fully utilizing the available stroke of the MREA. The second control objective was to completely recover the available MREA stroke during rebound, with no overshoot of the equilibrium point, i.e. dead-beat control. It is shown that the optimal MRSI control strategy implies the selection of two distinct Bingham numbers, one for the compression stroke and one for the rebound stroke, which achieve the control objectives.

• 出版日期2013-12