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Health-conscious battery management is one of the main facilitators for widespread commercialization of Li-ion batteries as the primary power source in electrified transportation and portable electronics and as the backup source in stationary energy storage systems. The majority of the existing Battery Management Systems (BMSs) define battery State of Health (SOH) in terms of internal resistance increase...
Bearing systems and harmonic drives in robots introduce complex kinematic errors which result in joint kinematic errors that reduce the accuracy of their manipulators. Typical calibration methods do not consider these complex errors, thus, limiting post calibration performance. In this paper, a method of modeling and calibrating robot kinematic errors by building a joint-dependent kinematic error...
Bonded Abrasive Wire (BAW) saw slicing is a popular method for silicon carbide wafer production; however, the wires are highly susceptible to vibrations. In this paper, a vibration model of the wire saw is presented, and a numerical analysis of this model, which is confirmed by experiments, is developed. The experiments show that the model can predict vibration characteristics of wire saw with no...
Wire saw machining is often used to cut hard and brittle materials, especially wafers in the semiconductor and optoelectronics industries. The cutting forces strongly effect part quality. Based on analyzing the forces generated from the chip deformation and friction of a single abrasive, an analytical force model is developed. The model is extended to a wire saw cutting force model and is used to...
Freeze-form Extrusion Fabrication (FEF) is a recent additive manufacturing process that fabricates ceramics using ram-based paste extrusion in a freezing environment. Previously, controlling the flow of the paste in FEF processes was accomplished through ram velocity or extrusion force control. However it has been shown that using a combination of both can lead to faster and more consistent extrusion...
Laser Metal Deposition (LMD) is an additive manufacturing process whose dynamics are driven by complex heat transfer and fluid flow phenomena. The LMD process, along with every additive manufacturing process, is fundamentally a two-dimensional process possessing both temporal (or spatial) domain dynamics and propagation of information from layer to layer. However, modeling the two-dimensionality of...
Due to numerous advantages of Polymer Electrolyte Fuel Cells (PEMFCs), they are becoming the mainstream fuel cell of choice for different applications. Open-cathode PEMFCs, in particular, are gaining increased popularity in low to medium power applications due to their simple structure and low parasitic losses. However, in order to achieve safe operation, increased durability and optimal performance,...
In this paper, development of an educational small scale hybrid electric vehicle (HEV) learning module is discussed. The module is comprised of all the key components of an actual HEV that have been scaled down to provide an ideal test platform to evaluate and study hybrid power trains as well as simulate both electric and HEV systems. The test platform consists of low cost off-the-shelf RC parts...
Laser Metal Deposition (LMD) is a layer-based manufacturing process in which a laser and powdered metal are used to create a molten bead that is then traced along a path to create functional parts. The properties of the structure, including shape and material microstructure, are the result of complex interactions between the laser, the powder, the part substrate and other factors. Thus, a control...
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