The concept of quasi-zero-stiffness (QZS) vibration isolator was proposed inrecent decades aiming at improving the low-frequency isolation performance in a passive manner. However, large excitation and small damping usually cause the transmissibility curve to bend seriously to the right, which greatly reduces the effective isolation region. This paper focuses on enhancing the QZS isolator by introducing tunable nonlinear inerter (TNI). After formulating the dynamic equation, the response is analytically calculated, the stability is analyzed, and numerical simulations are conducted. By comparing the isolation performances of the QZS isolator and the QZS-TNI isolator, it is shown that adding the inerter can considerably suppress the bending trend of the transmissibility curve, thereby resulting in a much wider frequency range of isolation as well as a lower peak transmissibility.

准零刚度（QZS）隔振器的概念是近几十年来提出的，旨在以一种被动的方式改善低频隔离性能。但是，较大的激励和较小的阻尼通常会导致透射率曲线严重向右弯曲，从而大大减小了有效隔离区域。本文着重介绍可调谐非线性惯性（TNI），以增强QZS隔离器。制定了动力学方程后，解析计算了响应，分析了稳定性，并进行了数值模拟。通过比较QZS隔离器和QZS-TNI隔离器的隔离性能，可以看出，添加惰化器可以显着抑制透射率曲线的弯曲趋势，