Installing a tuned mass damper (TMD) is a promising vibration control method in many engineering applications which can suppress excessive vibration of a primary structure by transferring and dissipating vibration energy from the primary structure to the TMD. To overcome some limitations and drawbacks of traditional tuned mass dampers in practice, a bio-inspired X-shaped structure/mechanism is utilized to design a novel tunable and nonlinear TMD (X-absorber) in this study. To this aim, multi-variable optimization analysis, tunable stiffness and damping properties, nonlinear influence and vibration suppression performance of the new X-absorber are systematically investigated. The X-absorber can provide beneficial nonlinear damping and tunable quasi-zero stiffness which can significantly improve system parametric robustness, widen vibration suppression bandwidth with a widened anti-resonance, effectively suppress resonant peaks of very low frequencies, and eliminate potential instabilities (e.g., bifurcation, jump) inherently existing in Duffing systems, compared with traditional absorbers. The effectiveness and robustness of the X-absorber with different excitations compared with a traditional spring-mass absorber are verified in experiments. The X-absorber presents a new insight into the design of nonlinear passive absorbers of high performance, and a more flexible and reliable solution to many engineering problems.

在许多工程应用中，安装调谐质量阻尼器（TMD）是一种很有前途的振动控制方法，该方法可以通过将振动能量从主结构传递到TMD并将其耗散，从而抑制主结构的过度振动。为了在实践中克服传统调谐质量阻尼器的某些局限和缺点，在本研究中，采用了生物启发的X形结构/机制来设计新颖的可调非线性TMD（X吸收器）。为此，系统地研究了新型X吸收器的多变量优化分析，可调刚度和阻尼特性，非线性影响和减振性能。X吸收器可以提供有益的非线性阻尼和可调整的准零刚度，从而可以显着提高系统参数的鲁棒性，与传统的吸收器相比，具有更宽的抗谐振能力，可以增加振动抑制带宽，有效地抑制非常低频率的谐振峰，并消除Duffing系统固有的潜在不稳定性（例如，分叉，跳跃）。与传统的弹簧质量吸收器相比，具有不同激励的X吸收器的有效性和耐用性已在实验中得到验证。X吸收器为高性能的非线性无源吸收器的设计提供了新的见解，并为解决许多工程问题提供了更加灵活和可靠的解决方案。与传统的弹簧质量吸收器相比，具有不同激励的X吸收器的有效性和耐用性已在实验中得到验证。X吸收器为高性能的非线性无源吸收器的设计提供了新的见解，并为解决许多工程问题提供了更加灵活和可靠的解决方案。与传统的弹簧质量吸收器相比，具有不同激励的X吸收器的有效性和耐用性已在实验中得到验证。X吸收器为高性能的非线性无源吸收器的设计提供了新的见解，并为解决许多工程问题提供了更加灵活和可靠的解决方案。