Abstract
Shear thickening fluid is a smart material with rheological properties that can be rapidly varied by excitation changes. To fully explore the advantages of using shear thickening fluid in various devices, a phenomenological model for simulating complex viscosity characteristics of the shear thickening fluid has been developed, and an analytical model has been presented to predict the mechanical characteristics and performance of a damper filled with shear thickening fluid. Based on the analytical model, the force displacement curves are first analyzed for different excitation amplitudes and frequencies. Second, an investigation of the time history of the damping force at various excitation amplitudes is conducted. Finally, the effects of key design parameters on the force displacement and force velocity curves are discussed. The results show that the shear thickening fluid damper exhibits significant velocity correlation, and the damping force increased as the shear rate of shear thickening fluid increased until the threshold value. For the vibration with high frequency, or fast velocity, or large amplitude, the shear thickening fluid is easy to have high shear rate, which results in a great vibration control capability for the shear thickening fluid damper.
Highlights
Passive control is the simplest control method, and a damper is the most commonly used passive control device
For that case, an increase in frequency could effectively improve the mechanical performance of the shear thickening fluid (STF) damper at both ends
The curves calculated by the phenomenological model in this investigation served as input for the analytical model of the STF damper, which was established in conjunction with flow momentum equations, in order to evaluate its mechanical performance and characteristics when subjected to a harmonic load
Summary
Passive control is the simplest control method, and a damper is the most commonly used passive control device. Their dynamic properties may be modified when subjected to external electric and magnetic fields Owing to their rheological properties, ER fluids and MR fluid can be used in dampers[1,2,3,4,5] and in other applications, as indicated by previous studies.[6,7,8] Another example of an adaptive material is a laminate containing a pre-deformed wire made of shape memory alloy (SMA)[9,10] that modifies the properties of a smart material as its temperature varies. In order to mitigate structure or equipment vibrations without an external power source, a material that changes its own properties according to the external excitation conditions may be used as an alternative to conventional materials
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