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252 results on '"Shen, Yu-Lin"'

25. Analysis of Wind Farms under Different Yaw Angles and Wind Speeds.

Author

Das, Rubel C. and Shen, Yu-Lin

Subjects
*WIND speed, *WIND power plants, *LARGE eddy simulation models, *ANGLES, *WIND turbines
Abstract

Wind farm optimization is pivotal in maximizing energy output, reducing costs, and minimizing environmental impact. This study comprehensively explores wind farm behavior under varying wind conditions and yaw angles to achieve these objectives. The primary motivation is to optimize wind farm performance and efficiency through proper yaw adjustment in response to wind speed changes. A computational investigation using a three-by-three wind turbine array was conducted, employing large eddy simulation (LES) to evaluate wind farm performance. Nine LES cases were considered, incorporating three wind speeds (7.3 ms−1, 10.4 ms−1, and 4.3 ms−1) and three yaw angles (30°, 20°, and 0°), with nearly constant turbulence intensity (TI) at 12.0%. The impact of wind speed and yaw angles on wake characteristics and power outputs were analyzed. The findings reveal that wind speed has limited influence on wake characteristics and power outputs, except for lower wind speeds at a yaw angle of 20 degrees. These results contribute to understanding wind farm performance optimization, aiding in developing strategies to enhance energy extraction while minimizing costs and environmental implications. [ABSTRACT FROM AUTHOR]

Published
2023
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49. Effects of pre-existing interfacial defects on the stress profile in aluminum interconnection lines

Author

Shen, Yu-Lin

Subjects
Finite element method -- Usage, Aluminum -- Research, Dielectric devices -- Research, Business, Engineering and manufacturing industries, Science and technology
Abstract

A numerical analysis was conducted on the thermal stress profile in aluminum interconnection lines in the presence of local debonded regions between the surrounding dielectric and the line. Two-dimensional and three-dimensional finite element analyses were employed in examining the stress field for different geometrical features of the interconnect and debond areas. Results show that the local decrease of stress in aluminum is caused by interfacial debonding.

Published
1998

50. Laser linking of metal interconnects: analysis and design considerations

Author

Shen, Yu-Lin, Suresh, Subra, and Bernstein, Joseph B.

Subjects
Laser beams -- Usage, Metals -- Electric properties, Gate arrays -- Research, Integrated circuits -- Passivation, Metallizing -- Research, Business, Electronics, Electronics and electrical industries
Abstract

A two-level metallization process is used for metal-metal linking between adjacent lines of aluminum-based metallization. Pulsed laser is symmetrically adjusted between adjacent lines on the same interconnected level. With increase in dielectric thickness between the aluminum and passivation, the damage in passivation decreases. A reduction in spacing between metal lines increases linking propensity. Molten aluminum forms a connection following thermo-mechanical fracture of the dielectric and passivation. A plane strain model is used for numerical simulation by the finite element method.

Published
1996

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