A Zero-stiffness Vibration Isolator Capable of a Wide Range of Loads and Large Displacements

• Main Authors: Sheng-AnYang, 楊勝安
• Other Authors: Chao-Chieh Lan
• Format: Others
• Language: zh-TW
• Published: 2015
• Online Access: http://ndltd.ncl.edu.tw/handle/65550509454129516165

碩士 === 國立成功大學 === 機械工程學系 === 104 === This thesis proposes the design and experiment of a vibration isolator capable of isolating a wide range of loads. The isolator consists of two oblique springs and one vertical spring to achieve zero-stiffness at the equilibrium position. The zero-stiffness characteristic makes the isolator attenuate external disturbance more at low frequencies, when compared with linear isolators. Unlike previous studies, this paper focuses on the analysis of the effect of different loads and the implementation of an adjustment mechanism to handle a wide range of loads. To ensure zero stiffness under imperfect stiffness matching, a lateral adjustment mechanism is also introduced. Instead of using coil springs, special planar springs are designed to realize the isolator in a compact space. Static and dynamic models are developed to evaluate the effect of key design parameters so that the isolator can have a wide isolation range without sacrificing its size. A prototype and its associated experiments are presented to validate the transmissibility curves under three different loads. A further design and discussion is presented for the purpose of attenuating large excitation amplitudes. The results clearly show the advantage of zero-stiffness isolators against linear isolators.