Open Access. Powered by Scholars. Published by Universities.®
- Discipline
Articles 1 - 2 of 2
Full-Text Articles in Engineering
Electro Mechanical Actuator Test Stand For In-Flight Experiments, Michael Koopmans, Catlin Mattheis, Austin Lawrence
Electro Mechanical Actuator Test Stand For In-Flight Experiments, Michael Koopmans, Catlin Mattheis, Austin Lawrence
Mechanical Engineering
The Prognostic Center of Excellence at NASA Ames is currently researching actuator prognostics, specifically in the application of electro mechanical actuators (EMA’s). Cal Poly ME students Michael Koopmans and Catlin Mattheis and EE student Austin Lawrence have chosen to undertake the task of building a test stand that will be flown in flight while testing EMA’s specific faults. A stand was designed to fit inside a standard 19” rack, take power from the aircraft 3 EMA’s, a computer, data acquisition, and electric magnets switches are powered. A MIL STD 1553 interface is present to allow fault injection. Vibration and temperature …
Design Of An 8-Channel Data Acquisition System For Measuring Diode Junction Temperature, Jason Maynard
Design Of An 8-Channel Data Acquisition System For Measuring Diode Junction Temperature, Jason Maynard
Industrial and Manufacturing Engineering
The solid state lighting industry is striving to expand the use of light emitting diodes (LEDs) in more applications, particularly in high brightness applications. As the power of LEDs increase, heat removal becomes a critical issue. To improve device lifetime, quantum efficiency, and LED colour, the diode p-n junction temperature (Tj) must be kept to a minimum. Measuring this key parameter is difficult or impossible with direct methods, such as thermocouples and infrared cameras, due to the small size of LEDs. Fortunately, junction temperature can be measured indirectly by using a relationship between the diode forward voltage (Vf) and junction …