Based on theoretical and experimental investigations, this paper proposes a nonlinear energy sink (NES) with piecewise linear springs to enhance vibration suppression effects. A cubic nonlinear oscillator is coupled with a piecewise linear spring to form an enhanced NES (E-NES). Without adding a new resonance region and changing the resonance frequency of the primary system, the enhanced NES can achieve better vibration suppression effects. Based on the free vibration and the forced vibration, the effect of piecewise linear stiffness and gap displacement on the vibration suppression is profoundly investigated. Moreover, the parameters of the piecewise spring are optimized through the differential evolution algorithm to obtain the best damping effect of the E-NES. Furthermore, the experiments are conducted to verify the theoretical results. The results show that the E-NES has a better suppression effect on the vibration of the primary structure than that of the cubic NES in most cases. However, it also happens that the vibration suppression effect of the E-NES is weaker than that of the conventional NES. The design parameters can be optimized efficiently by the differential evolution algorithm. Experiments show that vibration elimination efficiency of the E-NES can exceed 90%. Therefore, it is believed that research on using piecewise springs to enhance the vibration suppression efficiency will attract attention.

基于理论和实验研究，本文提出了一种具有分段线性弹簧的非线性能量吸收器 (NES)，以增强振动抑制效果。三次非线性振荡器与分段线性弹簧耦合以形成增强型 NES (E-NES)。在不增加新的共振区和改变一次系统的共振频率的情况下，增强型NES可以达到更好的振动抑制效果。基于自由振动和受迫振动，深入研究了分段线性刚度和间隙位移对振动抑制的影响。此外，通过差分进化算法优化分段弹簧的参数，以获得E-NES的最佳阻尼效果。此外，还进行了实验以验证理论结果。结果表明，在大多数情况下，E-NES对初级结构的振动抑制效果优于立方NES。但是，E-NES 的振动抑制效果也比传统的 NES 弱。通过差分进化算法可以有效地优化设计参数。实验表明，E-NES的消振效率可达90%以上。因此，相信利用分段弹簧来提高振动抑制效率的研究将会受到关注。通过差分进化算法可以有效地优化设计参数。实验表明，E-NES的消振效率可达90%以上。因此，相信利用分段弹簧来提高振动抑制效率的研究将会受到关注。通过差分进化算法可以有效地优化设计参数。实验表明，E-NES的消振效率可达90%以上。因此，相信利用分段弹簧来提高振动抑制效率的研究将会受到关注。