Vibration characteristics and control of transducer under constraint of nonlinear stiffness of hydraulic cylinder

GUO Yan; HE Ren; TAO Wei

doi:10.3969/j.issn.1671-7775.2022.03.003

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Journal of Jiangsu University(Natural Science Edition) ›› 2022, Vol. 43 ›› Issue (3) : 263-269. DOI: 10.3969/j.issn.1671-7775.2022.03.003

Vibration characteristics and control of transducer under constraint of nonlinear stiffness of hydraulic cylinder

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Abstract

According to the energy collection requirements of the vibration energy recovery device of hydrostatic speed bump, a transducer based on hydraulic cylinder was proposed. The nonlinear stiffness characteristics of the hydraulic cylinder of transducer were analyzed, and the change law curve between effective stiffness and piston position of the hydraulic cylinder of transducer was obtained. To solve the vibration problem of transducer under the influence of dynamic characteristics, a vibration model of the transducer was established under the constraint of nonlinear stiffness of hydraulic cylinder, and the amplitudefrequency response of the system was obtained by the average method. The effects of nonlinear stiffness, initial displacement of rodless piston of hydraulic cylinder and external excitation amplitude of transducer system on the amplitudefrequency characteristics of transducer hydraulic cylinder system were analyzed. The feedback control of transducer system was investigated based on the Lyapunov discriminant method, and the effectiveness of the feedback controller was verified by comparing the vibration velocity and displacement curves before and after the control. The results show that the feedback control can reduce the occurrence of violent vibration and improve the system stability.

Key words

transducer / hydraulic cylinder / vibration / nonlinear stiffness / amplitudefrequency response / feedback control

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GUO Yan, HE Ren, TAO Wei. Vibration characteristics and control of transducer under constraint of nonlinear stiffness of hydraulic cylinder[J]. Journal of Jiangsu University(Natural Science Edition), 2022, 43(3): 263-269 https://doi.org/10.3969/j.issn.1671-7775.2022.03.003

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