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Vibration Suppression of MR Sandwich Beams Based on Fuzzy Logic
No full textIn this paper, the vibration suppression capabilities of magnetorheological (MR) layer in smart beams is investigated. A three-layered beam including MR elastomer layer sandwiched between two elastic layers is considered. By assuming the properties of MR layer in the pre-yield region as viscoelastic materials behavior, the governing equations of motion as well as the corresponding boundary conditions are derived using Hamilton’s principle. Due to field-dependent shear modulus of MR layer, the stiffness and damping properties of the smart beam can be changed by the application of magnetic field. This feature is utilized to suppress the unwanted vibration of the system. The appropriate magnetic field applied over the beam is chosen through a fuzzy controller for improving the transient response. The designed fuzzy controller uses the modal displacement and modal velocity of the beam as its inputs. Free and forced vibration of smart sandwich beam is investigated using numerical simulations. The results show that the magnetorheological layer along with the designed fuzzy controller can be effectively used to suppress the unwanted vibration of the system. The qualitative and quantitative knowledge resulting from this research is expected to enable the analysis, design and synthesis of smart beams for improving the dynamic performance of smart engineering structures
JEE Selects Research in Practice: Reality Check
No full textMosyjowski et al cite that engineering professionals who return for advanced study after significant time in the workforce are an often overlooked group that can provide diverse perspectives and experiences within engineering programs. In their study, they focused on those who returned for an engineering PhD and potential factors that could shape their decisions to pursue and persist in doctoral study. They examined how returners\u27 perspectives compared with those of direct-pathway students who pursue an engineering doctorate shortly after completing their undergraduate degree. It is possible that lower pre-PhD expectancy of success and higher perceived costs could negatively shape returners\u27 decisions to enroll and persist in engineering doctoral programs. In light of this, they recommend that universities track returner status to better understand these students and target intervention
Year 4 Comprehensive Evaluation Institutional Response
No full textKettering’s response to the HLC visiting team’s initial report
Effect of La on Arc Erosion Behaviors and Oxidation Resistance of Cu Alloys
No full textCu with and without La addition was prepared and the effect of a trace amount of La on the arc erosion behaviors and oxidation resistance of Cu alloys was investigated. The results indicate that CuLa alloy exhibits superior oxidation resistance and arc erosion resistance. The contact resistance and temperature rise were obviously improved. The oxidation resistance of CuLa alloy mainly is due to the interface wrapping of La2O3 particles and CuLa alloy phase on Cu atoms. Thermodynamic calculation indicated that La2O3 could form preferentially in the CuLa alloy, which was beneficial for the protection of the Cu substrate. According to kinetics analysis, the activation energy of CuLa alloy was higher than that of pure Cu, indicating the better oxidation resistance of CuLa alloys
