Reducing contact resistance of high current connectors on electric vehicle by controlling contact pressure and addition of plating material
This paper studies on contact resistance on copper busbar connection relative to plating materials, plating thickness, and contact pressure. This study is important because busbar connection plays an important role on electric distribution performance. A good busbar connection would have low contact resistance, therefore low energy losses and better reliability. In this study, the sample are busbar connection without plating, busbar connection with zinc plating, busbar connection with nickel plating, and busbar connection with silver plating. First aspect that is going to be tested is contact resistance measurement without load on each. The next test is contact resistance measurement with DC load of 9, 18, and 27 A. Each test is conducted with the contact pressure variation of 5.6, 7.0, dan 8.4 MPa, and with plating thickness of 5, 15, and 25 μm. The result shows that busbar connection with 5 μm silver plating have much lower contact resistance compared to all the other configuration.
TiC-based nanocomposite coatings as electrical contacts
This Thesis concerns the advanced surface engineering of novel TiC-based nanocomposite and AgI electrical contact materials. The objective is to make industrially applicable coatings that are elect ...
Spectroscopy of high rate events during active interrogation
Abstract Pulsed accelerators are being used for radiographic inspections in homeland security applications. Adding spectroscopic detection capability enables additional information to be extracted but challenges signal processing hardware. This work compares two approaches to cost-effective digital spectroscopy systems designed to handle these high rate scenarios. In the first system, the signal from a PMT is directly digitized and then deconvolved on a PC using standard techniques. Bypassing the preamplifier, this system can handle high count rates (>10 6  cps) from an LaCl 3 detector with no dead time and an energy resolution of 5% at 1.33 MeV. Spectra acquired from fission product gamma rays between interrogation pulses are shown. At higher rates, this approach is limited by the DAQ transfer rate to the PC. Instead, we tested a fast ADC (125 MSPS) and an FPGA that performed onboard, real-time digital signal processing (DSP). The energy spectrum is generated on the FPGA board during the measurement and transferred later. This system was tested in nuclear resonance fluorescence (NRF) experiments. Resonance peaks from NRF reactions are shown.