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Development of a new method for joint damping identification in a bolted lap joint
M. Sanati,Y. Terashima,E. Shamoto,S. S. Park 대한기계학회 2018 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.32 No.5
Mechanical joints have considerable effects on dynamic behaviour of machine tools; thus, joint damping identification is important in studying the dynamics of mechanical structures. Due to the difficulties in analysis of microslip friction, the experimental prediction of microslip joint dynamics is of great importance. In this study, a new experimental approach is proposed to determine the damping of bolted lap joints. Because of the complex nature of the mechanical joints, the lap joint is isolated through the addition of a mechanical resonator, which consists of a lumped mass and spring, to the bolted structure. The frequency response function (FRF) of this system is used for joint damping identification. This approach is used for bolted structures under both translational and torsional excitations and overcomes difficulties associated with slip boundaries identification in the joint interface. The method is verified by comparing the obtained results with those of the hysteresis loop approach.
송영찬(Y. C. Song),社本 英二(E. Shamoto),森脇 俊道(T. Moriwaki) 한국정밀공학회 2004 한국정밀공학회 학술발표대회 논문집 Vol.2004 No.10월
In the present research, a ultra-precision diamond cutting of thermo-plastic materials, polycarbonate (PC) and cyclic olefin polymer (COC), is carried out by applying a method named ultrasonic elliptical vibration cutting developed by the authors. It is experimentally proved that good optical surfaces are obtained by applying the elliptical vibration cutting in cases of machining of flat surfaces and grooves as compared with the conventional diamond cutting. The maximum surface roughness in peak to valley value obtained is less than 60 nm and 20 nm for PC and ZEONEX, respectively.