Utilization of simulated annealing method for optical design of a thin rectangular small-size edge-type hollow-cavity LED luminaire
In this paper, we present the simulation results using simulated annealing method in the preliminary optical design for the hollow cavity of a thin rectangular small-size edge-type hollow-cavity LED luminaire. The simulation results demonstrated its feasibility of commercial use with both illuminance uniformity and light extraction efficiency of above 80% on the emission surface of its hollow cavity.
Designing LED array for uniform illumination distribution by simulated annealing algorithm.
We propose a numerical optimization method designing LED array for achieving a good uniform illumination distribution on target plane. Simulated annealing algorithm is employed to optimize LED array arrangement. Using the method, we optimized three LED arrays with various luminous intensity profiles. In order to exhibit the design freedom of the method, we use some LEDs with different intensity value in the first and third array, respectively. By optimizing, the three arrays all produced highly uniform illumination distribution with the uniformity of 0.12, 0.23 and 0.13, respectively. It indicates our method can design various luminous intensity distribution LED arrays and design array consisting of LEDs with different intensity value. In addition, the method is simple and can optimize the LED array automatically by computer program. To the best of our knowledge, it is first time to use numerical optimization method to design the optimal LED array arrangement for uniform irradiance.
Efficiency increment in 3d multi‐zone boundary element algorithms by use of iterative solvers
Abstract In this work general aspects of developing efficient generic multi‐zone BEM algorithms are discussed, focusing specifically on three‐dimensional formulations. The main idea followed in the article for coupling a certain number of subregions discretized with boundary elements is that the global sparse matrix of the coupled system is implicitly considered, without condensing the problem quantities into the interface variables and also without manipulating any of the zero blocks appearing in the system matrix. Thereby an algorithm, optimum in respect to storage requirements, is developed. Also, the performance of the proposed coupling algorithm is further increased by making use of iterative solvers. Recently reported research emphasising the efficiency of such solvers in comparison with direct ones and the results obtained in this paper for a simple 3D elasticity problem are used to show the efficiency of the multi‐zone BEM strategy presented.