Vibration analysis of quasi zero stiffness vibration isolator with composite material

Abstract

Characteristics are a trending and impressive approach to attenuate undesirable vibration. There is a limit in the isolation performance of the existing models of QZS vibration isolators, which are used with either helical coil springs or Euler s buckled beam resulted in unstable dynamic response while lowering vibration frequencies. To enhance the damping performance of the QZS vibration isolator, it is recommended to use double-acting hydraulic cylinders (fluidic actuators in short) to absorb the dynamic vibrational frequencies. Fluidic actuator contributes to the vital role on diminishing vibrational frequencies with less amplitude and adopting the system to various static loading conditions by adjustable damping factors. This Research work develops a QZS Vibration isolator designed with fluidic actuators. To this research associates two types of vibration isolators. The first model was designed and developed with fluidic actuators in oblique and helical coil spring in vertical directions as Quasi Zero Stiffness Vibration Isolator with Fluidic Actuators and Helical Coil Spring (QZSFA-HC) system, an approximate solution of the unique analytical relationship between the stiffness of the vertical spring and the bulk modulus of the fluid is derived. For characteristic analysis, the force transmissibility is formulated, and the damping ratio is explored. A modal analysis is done and compared to analytical data, as well as the development and investigation of an experimental prototype. The QZSFA-HC decreases external discomfort more at low frequencies, and a series of experimental tests have shown that soft non - linearity limits the resonant frequency, resulting in improved isolation, and the QZSFA-HC outperformed linear isolators by lowering vibrational frequencies. newline