The fluid flow in the runner of a hydraulic turbine has serious uncertainties. sealing failure magnetorheological (MR) device main shaft hydroturbine, caused by sudden change speed, always been difficult topic to research. This study first derives MR seal pressure and unbalanced curl equations hydroturbine shaft, then analyzes friction heat under different rotational speed mutation conditions t...

Title of Document: ADAPTIVE MAGNETORHEOLOGICAL SEAT SUSPENSION FOR SHOCK MITIGATION. Harinder Jit Singh Doctor of Philosophy, 2014 Directed By: Norman M. Wereley Minta Martin Professor and Chair Department of Aerospace Engineering This research focuses on theoretical and experimental analysis of an adaptive seat suspension employing magnetorheological energy absorber with the objective of minim...

We report a new kind of field-responsive fluid consisting of suspensions of diamagnetic (DM) and ferromagnetic (FM) microparticles in ferrofluids. We designate them as inverse magnetorheological (IMR) fluids for analogy with inverse ferrofluids (IFFs). Observations on the particle self-assembly in IMR fluids upon magnetic field application showed that DM and FM microparticles were assembled int...

In light of the insurmountable sedimentation magnetorheological (MR) fluid, it is great significance to ensure performability an MR damper by introducing a sensing method for fluid settling, and key indicator identify health status critical. However, settling monitoring system can nowadays only function in laboratory with transparent non-magnetic tubes, which not qualified in-situ steel-made cy...

Magnetorheological (MR) fluids are field-responsive suspensions of magnetizable particles which rheological properties can be dramatically altered by applying external magnetic fields (Phulé and Ginder 1998). Under the presence of a magnetic field, anisotropic chainlike structures result from field-induced particle magnetization as a consequence of the permeability mismatch between particle and...

This paper addresses an on-off adaptive damping isolation, in which the can be frequency dependent. The comparison with passive isolation is illustrated by trade off performance curve, shown relation between displacement and force transmissibility. control based on dampings a switching frequency. analytical optimization of law obtained. optimized showed remarkable improvement comparing one. At ...

Magnetorheological (MR) fluids with Fe3O4 particles are widely studied nowadays due to their soft magnetic nature, controllable morphology, and better chemical stability as compared metallic counterpart. However, they can be even more advantageous under Zn doping elevated magnetization hollow configuration low density, making them active, stable, dispersible in the carrier fluid. Here, we repor...