Abstract
Molecular Spring Isolator(MSI) is a novel passive vibration isolation technique, providingHigh-Static-Low-Dynamic(HSLD) stiffness based on the use ofmolecular springmaterial. Themolecular springmaterial is a solid-liquid mixture consisting of water and hydrophobic nanoporous materials. Under a certain level of external pressure, water molecules can intrude into the hydrophobic pores of nanoporous materials, developing an additional solid-liquid interface. Such interfaces are able to store, release, and transform mechanical energy, providing properties like mechanical spring. Having been only recently developed, the basic mechanic properties of a MSI have not been studied in depth. This paper focuses on the stiffness influence factors, the dynamic frequency response, and the vibration isolation performance of a MSI; these properties help engineers to design MSIs for different engineering applications. First, the working mechanism of a MSI is introduced from a three-dimensional general view of the water infiltration massive hydrophobic nanoporous pores. Next, a wide range of influence factors on the stiffness properties of MSI are studied. In addition, thefrequency response functions(FRFs) of the MSI vibration isolation system are studied utilizing the matching method based on equivalent piecewise linear (EPL) system. Finally, the vibration isolation properties of MSI are evaluated by force transmissibility.
Highlights
Due to the advantages of simple structure, high reliability, relatively lighter weight, and low cost compared to active vibration isolation, passive vibration isolation technologies are being intensively studied and developed in various industrial areas
It has been found that, depending on the external pressure, water molecules can intrude into the nanopores of hydrophobic nanoporous materials
To evaluate the frequency response functions (FRFs) of primary resonance of Molecular Spring Isolator (MSI) vibration isolation system, a matching method based on equivalent piecewise linear (EPL) system [26] is utilized
Summary
Due to the advantages of simple structure, high reliability, relatively lighter weight, and low cost compared to active vibration isolation, passive vibration isolation technologies are being intensively studied and developed in various industrial areas. Researchers in the vibration isolation area are still seeking new technologies and innovations [1,2,3] Nanoporous materials, such as zeolites and silica gel, have a wide range of applications in adsorption, separation, ion-exchange, heterogeneous catalysis, and other desired functions. When the hydraulic pressure decreases, different types of hydrophobic nanoporous materials exhibit different behaviours For materials such as hydrophobic silica gel, water molecules remain in the nanoenvironment. Recent studies show that a molecular spring exhibits HSLD stiffness intrinsically [12, 13, 21] and is able to support a heavy static load with very low dynamic stiffness. The vibration isolation properties of MSI are evaluated by force transmissibility
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