Dynamics analysis on the horizontal isolation effect of an air spring vibration isolator in series with an inverted pendulum

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (14) : 176-180.

YU Qiang1,XU Dengfeng2,ZHU Yu1,2,GUAN Gaofeng1,LI Qiang3

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Abstract

An air spring vibration isolator in series with an inverted pendulum has a good perspective in engineering application, because the stiffnesses in the vertical and horizontal direction can reach very low at the same time.The influence of the airbag horizontal flexibility on the stiffness of the air spring in horizontal direction, which was ignored in previous studies, was investigated by calculating the pressure of compressed air in the airbag and the restoring force of the air spring.The air spring was equivalent to a horizontal spring and then this spring was connected in series with the inverted pendulum.The differential equation of motion of the inverted pendulum was established and the inherent frequency in the horizontal direction of the integrated air spring vibration isolator was obtained.Experimental results validate that the error between the calculated result and the measured one is rather small.In the end, the simulation results show that the radius of the upper piston of the air spring and the mass of the load mainly affect the inherent frequency.

Key words

inverted pendulum / air spring / horizontal direction / dynamic analyses / inherent frequency

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YU Qiang1,XU Dengfeng2,ZHU Yu1,2,GUAN Gaofeng1,LI Qiang3. Dynamics analysis on the horizontal isolation effect of an air spring vibration isolator in series with an inverted pendulum[J]. Journal of Vibration and Shock, 2019, 38(14): 176-180

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