Quasi-zero-stiffness (QZS) mechanism is widely exploited in tailoring vibration isolators for balancing the load capacity and low/ultra-low frequency isolation performance. For these isolators, broadening QZS region, improving manufacturability, and enhancing tunability are relentless design pursuits. We here propose a cutting-edge tensegrity-based quasi-zero-stiffness (TQZS) isolator for torsional vibrations, simply by paralleling a positive-stiffness torsional spring to a negative-stiffness tensegrity. The stiffness modulation and vibration transmission models are established for the TQZS isolator to demonstrate its behaviors of broad QZS region and ultra-low frequency isolation. Furthermore, the effective frequency band of this isolator can be tuned through the specified damping ratio, designated stiffness ratio, and applied excitation amplitude. The present design is finally validated by both static and dynamic experiments on the proposed TQZS isolator prototype, exhibiting its QZS region of about ± 0.16 rad and isolation start frequency of around 6 Hz.

中文翻译：

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一种基于张拉整体的扭转隔振器，具有较宽的准零刚度区域


准零刚度 （QZS） 机制被广泛用于定制隔振器，以平衡负载能力和低/超低频隔振性能。对于这些隔离器来说，拓宽 QZS 区域、提高可制造性和增强可调性是不懈的设计追求。我们在这里提出了一种用于扭转振动的尖端基于张拉整体的准零刚度 （TQZS） 隔振器，只需将正刚度扭转弹簧与负刚度拉伸整体并联即可。建立了 TQZS 隔振器的刚度调制和振动传递模型，以验证其宽 QZS 区和超低频隔振的行为。此外，该隔振器的有效频带可以通过指定的阻尼比、指定的刚度比和施加的激励幅度进行调谐。最终，通过在所提出的 TQZS 隔振器原型上进行静态和动态实验来验证本设计，其 QZS 区域约为 0.16 rad± 且隔离启动频率约为 6 Hz。