Design and experimental study of a quasi-zero-stiffness vibration isolator incorporating transverse groove springs
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(2020) 20:67
ORIGINAL ARTICLE
Design and experimental study of a quasi‑zero‑stiffness vibration isolator incorporating transverse groove springs Chaoran Liu1 · Kaiping Yu1 Received: 6 March 2020 / Revised: 11 May 2020 / Accepted: 21 May 2020 © Wroclaw University of Science and Technology 2020
Abstract The concept of quasi-zero-stiffness (QZS) vibration isolator was proposed in recent decades to improve the low-frequency isolation performance without increasing the static displacement. This work is devoted to the concrete realization of a QZS isolator by utilizing transverse groove springs. Firstly, the QZS isolator is theoretically analyzed and some dynamical indices are analytically calculated. Then, the transverse groove springs are designed and the isolator prototype is assembled; the QZS feature of the prototype is basically fulfilled. Finally, the experiments are conducted by means of an electrodynamic shaker which generates sinusoidal base excitation for the isolator prototype; the experimental results clearly show the good isolation performance of the QZS isolator and meanwhile reflect some practical factors that should be noticed in actual applications. Keywords Quasi-zero stiffness · Vibration isolation · Hardening nonlinearity · Transverse groove spring · Prototype design
1 Introduction Vibration is a common phenomenon in the natural world. Even for the micro-/nano-sized structure, vibration still exists and plays an important role in influencing its overall characteristics: Demir et al. [1] studied the torsional and longitudinal vibrations of microtubules; Numanoglu et al. [2] studied the longitudinal free vibration behaviors of onedimensional nanostructures with various boundary conditions; and Akgöz et al. [3] studied the longitudinal vibration of microbars based on strain gradient elasticity theory. However, in the vast majority of engineering practices, vibration is harmful and usually causes undesirable consequences such as noise generation, passenger comfort reduction and wear of machine components. In order to reduce the unfavorable consequences caused by vibration, the vibration isolation is the most direct and convenient class of methods [4], which means inserting a device (usually called vibration isolator) between the vibration source and the vibration * Kaiping Yu [email protected] Chaoran Liu [email protected] 1
Department of Astronautic Science and Mechanics, Harbin Institute of Technology, Harbin 150001, People’s Republic of China
receiver to attenuate the vibration transmission. Vibration isolation methods are widely used in astronautics field: Chen et al. [5] designed a dual micro-vibration isolation system for optical satellite flywheel; Deng et al. [6] adopted vibration isolation method to reduce the negative effects of flywheel disturbance on space camera image quality; and Oh et al. [7] proposed an on-orbit vibration isolation system for the spaceborne cryocooler. Vibration isolation methods have also been widely used in other engineering fields like civil engineering, me
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