José M. García Ph.D

CFPHS

Assistant Professor

Engineering Technology

 

Contact Information


2300 South Washington Street

Kokomo, IN 46904-9003

email: jmgarcia (at) purdue.edu

phone: (765) 455-9219

Fax:     (855) 342-1111


Current Research


Electric-hydraulic drive-trains for automotive applications:


All electric and electric hybrid vehicles use permanent magnet or variable inductance motors to recover the energy from breaking and storing it in the battery pack. Unfortunately, the amount of power that can actually be recovered and stored is small because it takes large amounts of time to charge the batteries. Hydraulic accumulators on the other hand, can be rapidly pressurized when breaking the vehicle.A secondary purpose of the experimental vehicle is to demonstrate to students the concept of hydraulic hybrid vehicles implemented in an electric test car.


Application of Switching Valves to Improve Reliability of Hydraulic Systems:


Electro-Hydraulic Servo Valves are very sensitive to contamination, because the radial clearance between the spool and the sleeve in these valves is in the order of 5 μm or 0.2 thousands of an inch. This tight gap tends to break the hydraulic fluid and form sticky films increasing viscous friction and eventually creating spool stiction. Although these failure modes are not necessarily catastrophic, they do affect the hydraulic system performance, causing instability, loss of control and inefficiency. There is a need for a valve alternative that is resistant to particulate contaminants present in the fluid. Because tight clearance between the spool and the sleeve is required to avoid cross-port leakage, the best alternative is to design a valve that does not use a linear spool and sleeve configuration. My approach consists of replacing the Electro Hydraulic Servo Valve by a set of controlled, fast switching valves to adjust the motion and position of an actuator, as in for example: a metering valve in a gas turbine engine.


A Continuously variable hydraulic transmission for a small wind power drive train HIL simulation:


Usually, in wind power turbines the rotor rotates at approximately 15 to 25 revolutions per minute (RPM) in large wind power generators and up to 60 RPM in small wind power generators, while the output shaft speed of the electric generator must rotate at 1800 to 2200 RPM to operate at its optimal conditions. A gearbox or series of gearboxes are used to couple the turbine hub and the generator. These gearboxes have fixed gear ratios and therefore the amount of power captured by the wind turbine is limited by the available wind speed and the pitch angle which is usually fixed in small wind power turbines. This mechanisms are unreliable and could be improved to capture more energy from the wind



Portable Programable Electro-hydraulic Trainer:


A simple programmable micro-controller and a toy excavator fitted with pneumatic cylinders and displacement sensors are used in the classroom to teach through experiments the principles of hydraulics, pneumatics, electronics, control and automation. An example of the current prototype can be found at:

PFPD


Teaching

Materials and Processing I (MET 143)  Fall 2012 (Lecture and Laboratory)

Materials and Processing II (MET 144)  Spring 2013 (Lecture and Laboratory)

Applied Statics (MET 111)  Spring 2013 (Lecture)



Professional Societies


ASME, SAE, STLE, NFPA, IFPS