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Application of FEM Simulation to AI V-Bending Process Control
Yang, M .,Manabe, K . 대한금속재료학회(대한금속학회) 1998 METALS AND MATERIALS International Vol.4 No.3
In this study, an artificial intelligent (AI) V-bending process control system with FEM simulation database was developed in order to achieve the production with high accuracy and flexibility. An adaptive filter was proposed to modify the simulated punch force-stroke curve (F-S curve) and to obtain the pseudo experimental one. The filtered simulation results are stored in the database and used to the V-bending process control with an intelligent process control system developed by the authors. The process controlled results show that the FEM simulation database with the compensation filter is very effective for the precision process control system. A high accurate V-bending process was achieved without the trial and error of V-bending tests.
고온상태에서 마그네슘 합금의 디프드로잉 성형성에 관한 연구
Kang, Dae-Min,Hwang, Jong-Kwan,El-Morsy, A.M.,Manabe, Ken-Ichn 한국기계가공학회 2003 한국기계가공학회지 Vol.2 No.2
Magnesium alloys have been paid attention In automotive and industries as lightweight materials, and with these materials it has been attempted at deep drawing process for assessment of formability of sheet metal. For warm deep drawing process with a local heating and cooling technique, both die and blank holder were heated at warm temperature while the punch was kept at room temperature by cooling water. Warm deep-drawing process with considering heat transfer was simulated by finite element method to investigate the improvement of deep-drawability and temperature distribution of Mg alloy sheet. The effect of sham rate sensitivity index on the deformation profile was considered in this work and the simulation results revealed that considering heat transfer is very effective for deep-drawability of Mg alloy. The deformed blank In considering heat transfer was drawn successfully without any localized thinning and the cup height is higher in contrast to results of simulations in considering no heat transfer.
Li, J.Y.,Suzuki, K.,Koike, Y.,Chen, D.S.,Yonezawa, T.,Nishihara, M.,Manabe, N. Asian Australasian Association of Animal Productio 2005 Animal Bioscience Vol.18 No.10
To determine the effects of short-term dietary supplementation of branched-chain amino acids (BCAAs) during nursing (from 3 to 28 days of age) on plasma BCAA levels and subsequent growths in cattle, 12 nursing male Holstein calves, randomly assigned to control and treatment groups (n = 6 in each group), orally received a daily supplement of essential BCAAs (2 g/kg body weight/day; 1:1:1 of valine, leucine and isoleucine) or not. The plasma BCAA levels increased linearly after the administration. During the treatment period, average daily gain (ADG) was lower in the treatment group (0.43${\pm}$0.07 kg/day) than the controls (0.71${\pm}$0.07 kg/day, p<0.05). However, at 2 months of age, ADG was significantly higher in the BCAA-treated group (1.16${\pm}$0.26 kg/day vs. 0.51${\pm}$0.06 kg/day, p<0.05). Furthermore, at age 8, 9 and 10 month, ADG in the treated group (1.35${\pm}$0.23, 1.46${\pm}$0.07 and 1.60${\pm}$0.16 kg/day, respectively) showed a linear increase and was significantly higher than that in the control group (0.88${\pm}$0.14, 0.70${\pm}$0.21 and 1.11${\pm}$0.11 kg/kg, respectively, p<0.05). Overall, ADG was 15.6% higher in the treatment group (1.26${\pm}$0.05 kg vs. 1.09${\pm}$0.04 kg; p<0.05). The final body weight at slaughter was 14.8% higher in the treatment group (759.5${\pm}$17.7 kg vs. 661.7${\pm}$21.2 kg, p<0.01). Thus, the supplementation of BCAAs during nursing improves ADG and carcass weight in cattle and is a useful husbandry technique for beef cattle.