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Vibration and lateral buckling optimisation of thin-walled laminated composite channel-section beams
Nguyen, Hoang X.,Lee, Jaehong,Vo, Thuc P.,Lanc, Domagoj Elsevier 2016 COMPOSITE STRUCTURES -BARKING THEN OXFORD- Vol.143 No.-
<P><B>Abstract</B></P> <P>This study presents vibration and lateral buckling optimisation of thin-walled laminated composite beams with channel sections. While flanges’ width, web’s height, and fibre orientation are simultaneously treated as design variables, the objective function involves maximising the fundamental frequency and critical buckling moment. Based on the classical beam theory, the beam element with seven degrees of freedom at each node is developed to solve the problem. Micro Genetic Algorithm (micro-GA) is then employed as an optimisation tool to obtain optimal results. A number of composite channel-section beams with different types of boundary conditions, span-to-height ratios, and lay-up schemes are investigated for the optimum design. The outcomes reveal that geometric parameters severely govern the optimal solution rather than the fibre orientation and it is considerably effective to use micro-GA compared with regular GA in term of optimal solution and convergence rate.</P>
장영진,정민환,민병화,William H. N,Lance P. F 한국수산과학회 2005 Fisheries and Aquatic Sciences Vol.8 No.3
The effects of photoperiod, temperature, and fish size on oxygen consumption (OC) in the black porgy Acanthopagrus schlegeli, a euryhaline marine teleost, were studied using a closed re-circulating seawater system with a respiratory chamber. Fish reared in indoor recirculating sea-water tanks were divided into two groups: small (15.7-55.8 g, mean 38.1±15.9 g) and large (108.7-238.8 g, mean 181.8±54.9 g) fish. The OC of the fish showed a clear diel rhythm, with higher values in the daytime and lower values at night, in accordance with light (09:00-20:59 h) and dark (21:00-08:59 h) cycles. The OC of the fish increased linearly with the water temperature. The OC was the highest at 10:00 h, one hour after the onset of daylight and was the lowest at 03:00 h, six hours after dusk. The average OC at 20°C during the light period was as high as 219.8 mg O2/kg/h in the small fish and 156.3 mg O2/kg/h in the large fish, while during the dark period it was as low as 130.5 and 110.4 mg O2/kg/h, respectively. The OC during the dark period, which showed limited variation, could be regarded as the resting OC, and was 107.6, 130.5, and 219.8 mg O2/kg/h at 15, 20, and 25°C, respectively, in small fish, and 52.3, 110.4, and 171.0 mg O2/kg/h in large fish. As the body weight of black porgy increased, the OC decreased ex-ponentially and the relationship was expressed as OC = 1,222.8BW–0.567, OC = 1,113.2BW–0.448, and OC = 1,495.3BW–0.468 at 15, 20, and 25°C, respectively. At a fish density of 14.5 g/L at 20°C, black porgy had the highest OC per breath compared to fish at the same density at 15 or 25°C. This suggests that the black porgy responds to the stocking density (15 kg/m3) and water temperature (20°C) conditions commonly observed in intensive aquaculture with the deepest breath and the highest metabolic activity.
Chang Young Jin,Jeong Min Hwan,Min Byung Hwa,Neill William H.,Fontaine Lance P. The Korean Society of Fisheries and Aquatic Scienc 2005 Fisheries and Aquatic Sciences Vol.8 No.3
The effects of photoperiod, temperature, and fish size on oxygen consumption (OC) in the black porgy Acanthopagrus schlegeli, a euryhaline marine teleost, were studied using a closed recirculating seawater system with a respiratory chamber. Fish reared in indoor recirculating seawater tanks were divided into two groups: small (15.7-55.8 g, mean 38.1$\pm$15.9 g) and large (108.7-238.8 g, mean 181.8$\pm$54.9 g) fish. The OC of the fish showed a clear diel rhythm, with higher values in the daytime and lower values at night, in accordance with light (09:00-20:59 h) and dark (21:00-08:59 h) cycles. The OC of the fish increased linearly with the water temperature. The OC was the highest at 10:00 h, one hour after the onset of daylight and was the lowest at 03:00 h, six hours after dusk. The average OC at $20^{\circ}C$ during the light period was as high as 219.8 mg $O_2$/kg/h in the small fish and 156.3 mg $O_2$/kg/h in the large fish, while during the dark period it was as low as 130.5 and 110.4 mg $O_2$/kg/h, respectively. The OC during the dark period, which showed limited variation, could be regarded as the resting OC, and was 107.6, 130.5, and 219.8 mg $O_2$/kg/h at 15, 20, and $25^{\circ}C$, respectively, in small fish, and 52.3, 110.4, and 171.0 mg $O_2$/kg/h in large fish. As the body weight of black porgy increased, the OC decreased exponentially and the relationship was expressed as OC=1,222.8$BW^{-0.567}$, OC=1,113.2$BW^{-0.448}$, and OC=1,495.3$BW^{-0.468}$ at 15, 20, and $25^{\circ}C$, respectively. At a fish density of 14.5 g/L at $20^{\circ}C$, black porgy had the highest OC per breath compared to fish at the same density at 15 or $25^{\circ}C$. This suggests that the black porgy responds to the stocking density (15 kg/$m^3$) and water temperature ($20^{\circ}C$) conditions commonly observed in intensive aquaculture with the deepest breath and the highest metabolic activity.