Design and test of an adjustable quasi-zero stiffness device and its use to suspend masses on a multi-modal structure

A.D. Shaw; G. Gatti; P.J.P. Goncalves; B. Tang; M.J. Brennan

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Design and test of an adjustable quasi-zero stiffness device and its use to suspend masses on a multi-modal structure

机译：可调节准零刚度装置的设计和测试及其在多模态结构上悬挂质量的用途

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In some applications, such as ground vibration testing in the aerospace industry, it is of interest to observe the modal behaviour of a slender structure while it is statically loaded. One way of statically loading such a structure is to suspend masses using very soft springs. If the springs are linear, then this results in an extremely large static deflection of the springs. This problem could be overcome by dynamically isolating the masses using quasi-zero stiffness (QZS) springs. This paper describes the design, construction and experimental testing of a device that can exhibit QZS. A novel design is proposed that allows the stiffness and the symmetry of the device to be adjusted independently using separate adjustment mechanisms. Quasi-static and dynamic testing of the device show that it can be adjusted to have an extremely low stiffness within the limits of measurement. The main trend of the force-displacement curve shows that it has a cubic stiffness characteristic, and that friction is responsible for its hysteretic behaviour. Dynamic testing shows that the device locks-up due to friction at low frequencies, but at high frequencies the device acts as an efficient linear isolator. An experiment was also performed where a mass was suspended on a multi-modal beam structure via the QZS device. It was shown that a static load could be applied to the beam without the attached mass appreciably affecting the dynamic response of the beam, even though the suspended mass was about 12% of that of the host structure.

机译：在某些应用中，例如航空航天行业的地面振动测试，在静态加载时观察细长结构的模态行为是有意义的。静态加载这样的结构的一种方式是使用非常软弹簧悬挂质量。如果弹簧是线性的，则这导致弹簧的极大静态偏转。可以通过使用准零刚度（QZS）弹簧动态隔离肿块来克服该问题。本文介绍了可以展示QZ的设备的设计，构建和实验测试。提出了一种新颖的设计，其允许使用单独的调节机制独立地调节装置的刚度和对称性。对设备的准静态和动态测试表明，可以在测量范围内进行调整为具有极低的刚度。力 - 位移曲线的主要趋势表明它具有立方刚度特性，并且摩擦对其滞后行为负责。动态测试表明，由于低频下的摩擦，设备锁定，但在高频时，器件充当有效的线性隔离器。还进行了实验，其中质量通过QZS装置悬挂在多模型梁结构上。结果表明，即使悬浮质量约为宿主结构的约12％，也可以将静载荷施加到梁而没有显着影响光束的动态响应。

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来源
《Mechanical systems and signal processing》 |2021年第5期|107354.1-107354.18|共18页
作者
A.D. Shaw; G. Gatti; P.J.P. Goncalves; B. Tang; M.J. Brennan;
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作者单位

College of Engineering Swansea University Swansea UK;

Department of Mechanical Energy and Management Engineering University of Calabria Rende Italy;

Department of Mechanical Engineering Faculty of Engineering UNESP Bauru Brazil;

Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education Dalian University of Technology Dalian China;

Department of Mechanical Engineering Faculty of Engineering UNESP Ilha Solteira Brazil;

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正文语种 eng
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Quasi-zero stiffness; High-static-low-dynamic-stiffness; Nonlinear vibration; Vibration absorber;

机译：准零刚度;高静态低动态刚度;非线性振动;减振器;

Design and test of an adjustable quasi-zero stiffness device and its use to suspend masses on a multi-modal structure

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