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NUMERICAL AND INTERFEROMETRIC ANALYSIS OF STARVATION EFFECT ON OIL FILM THICKNESS IN EHL CONDITION
F. ITOIGAWA,K. WATANABE,T. NAKAMURA,T. MATSUBARA 한국트라이볼로지학회 2002 한국트라이볼로지학회 학술대회 Vol.2002 No.10
A regression formula including the inlet film thickness as the parameter for the starvation factor in EHL condition is obtained by numerical analysis with Elrod's cavitation algorithm. In addition, an apparatus for starved film thickness measurement by use of the white light interferometry is developed in order to verify the proposed regression formula. From observation results by this apparatus, the proposed regression formula can predict tile reduction of central film thickness caused by starvation in a ball-plate contact with an uncertainty up to 10%
DEPENDENCE OF RUBBER FRICTION UPON ITS ELASTIC CHARACTERISTICS
T. NAKAMURA,T. HANASE,F. ITOIGAWA,T. MATSUBARA 한국트라이볼로지학회 2002 한국트라이볼로지학회 학술대회 Vol.2002 No.10
Rubber has large differences in elastic characteristics from the other solid materials such as metals. Firstly, the rubber exhibits considerably large elastic compliance. Second is highly non-linear elasticity in which the compliance decreases with increase in strain. The main objective in this research is to reveal the dependence of rubber friction upon these elastic characteristics of the rubber in detail. A super elastic FEM analysis is carried out with using an elastic property of practical rubber. From the calculated result, it is cleared that the rubber makes large real contacting area easier than the metals.
Design Optimization of Active Scanning Probe Using Parallel Link Mechanism
Takashi Harada,Ke Dong,Tomoyuki Itoigawa 한국정밀공학회 2012 International Journal of Precision Engineering and Vol. No.
A 3-dof active scanning probe using a translational parallel mechanism (TPM) is proposed. The TPM proposed in this study employs a small touching force control and can be used as a probing device for coordinate measurement, working within an area of a few cubic millimeters. In this paper, the characteristics of the mechanism, optimization of design, prototyping, and accuracy of the TPM are introduced. In the proposed optimization TPM design, the manipulability of the mechanism is equal in all directions. This implies that the positional sensitivities of the TPM share an isotropic relationship. The positional resolution of the mechanism becomes less than 1.0 μm in a cubic working range with side length of 1.6 mm. An experimental mechanism using the proposed design is introduced. In order to evaluate the accuracy of the TPM, we have developed an experimental system for the measurement of the position of the TPM using image processing. By applying mechanical parameters calibration, the accuracy of the absolute position of the TPM has been improved to 3.4 μm.