Abstract
A mechanical molecular spring isolator (MMSI) is proposed for the purpose of isolating the low-frequency vibration of a heavy payload. The MMSI is a passive vibration isolation technique mimicking molecular spring isolator characteristics of high-static-low-dynamic stiffness (HSLDS). An MMSI consists of a piston-cylinder container filled with the liquid and some hydraulic spring accumulators. The piston would support a lump of mass and be subjected to a specific external vibration excitation force. Those accumulators can get intercommunication by the liquid to produce the transformation from high static stiffness to low dynamic stiffness. The stiffness model of the MMSI with several identical accumulators is established based on the hydrostatic law. After that, some parameters that significantly influence the stiffness characteristics are studied. Results show that the stiffness property of this kind of MMSI demonstrates a piecewise linearity of three segments. It applies the averaging method to acquire amplitude-frequency and phase-frequency relationships of the piecewise linear vibration isolation system. An inevitable jump phenomenon may occur when the exciting force reaches the critical value. The vibration isolation performance is evaluated by energy transmissibility. Finally, an experimental prototype was designed to carry out quasi-static and dynamic experiments to verify the stiffness model and the dynamic properties as an HSLDS vibration isolator.
Highlights
Vibration isolation has been increasingly demanded for high-speed vehicles, precision machinery, and megastructures as a result of the higher fatigue endurance for structures and higher human comfort expectations in both static and dynamic environments
It causes the dilemma that low natural frequency and small static deformation cannot be achieved at the same time for a traditional linear isolator
Inspired by the aforementioned work, Yu et al [15, 16] found that a kind of nanoporous hydrophobic nanofunctional materials, which can absorb and release some water until the hydraulic pressure reaches a certain value, can be applied to the solid elastic element. erefore, the molecular spring isolator based on nanoporous hydrophobic nanofunctional materials is developed, and it naturally presents the high-staticlow-dynamic stiffness (HSLDS) property
Summary
Received 30 March 2020; Revised 1 June 2020; Accepted 8 July 2020; Published 3 August 2020. A mechanical molecular spring isolator (MMSI) is proposed for the purpose of isolating the low-frequency vibration of a heavy payload. E MMSI is a passive vibration isolation technique mimicking molecular spring isolator characteristics of high-staticlow-dynamic stiffness (HSLDS). An MMSI consists of a piston-cylinder container filled with the liquid and some hydraulic spring accumulators. Ose accumulators can get intercommunication by the liquid to produce the transformation from high static stiffness to low dynamic stiffness. Results show that the stiffness property of this kind of MMSI demonstrates a piecewise linearity of three segments. It applies the averaging method to acquire amplitudefrequency and phase-frequency relationships of the piecewise linear vibration isolation system. An experimental prototype was designed to carry out quasi-static and dynamic experiments to verify the stiffness model and the dynamic properties as an HSLDS vibration isolator
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