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Abstract
In this paper, a nonlinear energy sink with piecewise linear stiffness spring is proposed, and the fundamental characteristics of the nonlinear energy sink are investigated. Firstly, the structure of the piecewise linear stiffness spring is proposed and nonlinearity of the spring is analyzed. Then, the dynamic model of the primary vibration system with the nonlinear energy sink is built, and the responses and vibration suppression effects are studied by numerical simulations. Finally, the effectiveness of the NES is proved by experiment. The results show that the piecewise linear stiffness spring is effective; its structure is simple, compact and adjustable; the vibration attenuation performance of nonlinear energy sink is very good under moderate exciting force.
Highlights
The nonlinear energy sinks (NESs), which are usually light-weighted devices coupled to the primary vibrating systems through essentially nonlinear elements, have been studied extensively in recent years, as they haveH
The structures of the piecewise linear stiffness spring and the NES are proposed, the dynamics of the primary system with the nonlinear energy sink is studied, and the effectiveness of the NES is proved by experiment
The comparison of reaction forces of the nonlinear spring and the spring with piecewise linear stiffness is shown in Fig. 1c, from which it can seen that the fitting effect is very good
Summary
The nonlinear energy sinks (NESs), which are usually light-weighted devices coupled to the primary vibrating systems through essentially nonlinear elements, have been studied extensively in recent years, as they have. The traditional nonlinear element is coil springs, but the coil spring will produce a large linear stiffness, and it is difficult to eliminate the linear part. Some approaches such as adding negative linear stiffness to balance the linear part are effective [8], it will increase the size or complexity of the NES. The structures of the piecewise linear stiffness spring and the NES are proposed, the dynamics of the primary system with the nonlinear energy sink is studied, and the effectiveness of the NES is proved by experiment
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