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DYNAMICS ANALYSIS OF TORSIONAL VIBRATION INDUCED BY CLUTCH AND GEAR SET IN AUTOMATIC TRANSMISSION
Meng Li,Michael Khonsari,Ruzhou Yang 한국자동차공학회 2018 International journal of automotive technology Vol.19 No.3
The torsional vibration generated during clutch engagement directly affects the shifting quality of automatic transmissions, where the noise source stems from both the clutch and the gear set. To predict the dynamical response and driveline oscillation, a comprehensive mathematical model of the vehicle powertrain equipped with automatic transmission is developed with consideration of nonlinearities in the clutch and the planetary gear set. For the clutch, the dynamics of stickslip is described for the transition between the slipping to locked states. The gear backlash model is used to analyze the rattle noise of the planetary gear set. Based on extensive powertrain simulations for the clutch engagement process, the magnitude of vibration propagation in the driveline are predicted to identify the primary factors of noise generation.
Tensile Properties of Additively Manufactured C-18150 Copper Alloys
Congyuan Zeng,Hao Wen,Benjamin C. Bernard,Huan Ding,Jonathan R. Raush,Paul R. Gradl,Michael Khonsari,Shengmin Guo 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.1
The efect of aging processes on the tensile properties of C-18150 copper alloy samples, made by laser powder-bed-fusionadditive manufacturing (AM) process with three diferent fabrication orientations (horizontal, angled, and vertical to the builddirection), are investigated. For the as-fabricated C-18150 AM parts, horizontal and angled fabrication directions result inmarginally better tensile strengths and much improved strain-to-failure values than those of vertically built AM parts. Afterthe aging treatment, tensile strength can be signifcantly enhanced with a sacrifce of the strain-to-failure value. Moreover,the highest tensile strength is achieved by treating the as-fabricated samples at an aging temperature of 500 °C for 2 h. At800 °F (427 °C), both tensile strength and ductility are smaller than low temperature values (room temperature and 400 °F/204 °C). Phase constituents, microstructure, and composition distribution of the AM parts are characterized to gain insightinto the measured tensile properties.