Seawater desalination is a promising and important technology especially for coastal countries that lacking fresh water. Seawater desalination applications are still limited by challenges mainly include high energy consumption, membrane fouling and low production rate. We intend to develop a novel desalination technique – centrifuge desalination. Our designed vibration assisted desalination centrifuge is based on the reverse osmosis (RO) membrane. The RO membrane allows pure water to pass through from high concentrated salt water source under high pressure condition. Currently most commercial applications use pumps to generate high pressure. We feed the seawater to a rotating centrifuge to generate required high pressure (80 bar). The objective of this project is to improve the production rate and reduce membrane fouling.
The catcher bearing (also known as an auxiliary, back-up or touchdown bearing) is designed to prevent the unexpected contact between the rotor and stator of the magnetic bearing in cases of overload or failure of the magnetic bearing. When AMB’s rotor drops onto the catcher bearing, large heat and contact force will be generated. Here the high fidelity rotor drop model was established which considered both the dynamic and thermal behavior of the system so as to accurately simulate the drop event and predict the Catcher bearing life.
The next generation flywheel system features a patented 12,000 lbs, shaft-less high strength steel flywheel with double energy density to convectional steel flywheel. Magnetic levitation and vacuum sealed operation chamber yields minimal power loss. System with Energy storage of 100kw-hr and power rate of 100kw. The system has potential application in uninterruptible power service (UPS), power grid regulation and wind/solar farms.
100kw-Hr Flywheel and Test Facility
In conjunction with Calnetix Corp. the Vibration Control and Electromechanics Lab has built a 100 kw-Hr Energy Storage Flywheel ESF for the DOE. The flywheel is depicted in the drawings below and the facility is also shown. The flywheel is designed to spin at 5,000 rpm, store 100 kW-hr of energy and produce 150 kW of power. This unique steel rotor design has the potential of nearly doubling the energy density of steel flywheels. It also has a low height design, which facilitates stacking the flywheels or additional energy storage and power.
The next generation fuel injector
The developed Flash Vapor Fuel Injector with amazingly fast fuel heating capability reduces fuel thermal decomposition while achieving different fuels’ vaporization temperature with ease.
Aerodynamic studies of gearbox windage using ANSYS Fluent/Cfx. Windage Power loss (WPL) become dominant in high-speed rotating machinery. This research includes modeling gear windage power loss with computational tools (eg. Fluent), in order to predict the power loss. The ultimate goal is to find procedures to effectively reduce Windage Power Loss.
Thermal induced synchronous rotor instability problem, known as the Morton effect is caused by the journal differential heating in fluid film bearing. The temperature differential across the journal causes a bending moment and generates a thermal bow, which may cause increased vibration and continued growth of the synchronous orbit into a limit cycle. Current research focuses on prediction of Morton effect with high fidelity finite element method, which considers 3D elastic and thermal tilting pad bearing & shaft model. Current Codes can achieve nonlinear transient and frequency analysis with prediction of vibration amplitude and temperature distribution. This project is funded by the Turbomachinery Research Consortium in Texas A&M Univ.
Unlike linear system, multiple steady-state orbits (e.g., multiple synchronous, multiple harmonic orbits, multiple whirl or whip)
can exist in nonlinear rotordynamic system at the same location, rpm and imbalance. In general, nonlinear rotordynamic analysis
to steady state response employs Transient, Numerical Integration Scheme (TNIS), but TNIS has some limitation such that users need to
specify initial condition for all degrees of freedom (e.g. positions and velocities) and important response states may miss on
the initial conditions. On the other hand, Multiple Response States Prediction (MRSP) employs an algorithm directed search to
determine all steady state response. MRSP nonlinear vibration analysis insures that a high vibration state was not missed by
the TNIS. Numerical algorithms such as Shooting, Deflation, Genetic, and Pseudo arclength Continuation with system reduction
technique has been studying in this research to develop nonlinear solvers which is able to analyze autonomous/non-autonomous
large order rotor bearing system. The solver is aimed to be compatible to various nonlinear force models for rub, fixed and
tilting pad bearings, squeeze film dampers, floating ring bearing and seals. Fig.1 shows an example of multiple response in a
rotor system supported by floating ring bearing. MRSP identified that three different limit cycles can coexist near Hopf
bifurcation point. In addition, this project includes topics of nonlinear behaviors in rotor bearing system such as chaos and
synchronization. (See Fig. 2)
Keywords: Nonlinear vibrations, multiple response, Shooting, Continuation, system reduction, chaos This research is supported by Turbomachinery Research Consortium (TRC).
Finite element-based rotor dynamic analysis in the turbo machinery and drilling industry, such as turbines, compressors, pumps and drill string vibrations
This project has been funded by University of Indiana and seeks to develop a cavopulmonary assist (impeller pump) for the univentricular Fontan circulation. The four company development team includes Texas A&M's Vibration Control and Electromechanics Lab (VCEL) led by Dr. Alan Palazzolo. VCEL's tasks include rotordynamics, and CFD based flow studies. The extensive experience of VCEL in fluid film and magnetic bearings, flow and rotordynamics compliments the requirements of this project.