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Robust tolerance design of mechanical assemblies using a multi-objective optimization formulation
, Article SAE Technical Papers ; Vol. 1 , 2014 ; Movahhedy, M. R ; Sharif University of Technology
Abstract
The design process always has some known or unknown uncertainties in the design variables and parameters. The aim of robust design is minimization of performance sensitivity to uncertainties. Tolerance allocation process can significantly affect quality and robustness of the product. In this paper, a methodology to minimize a product's sensitivity to uncertainties by allocating manufacturing tolerances is presented. The robust tolerance design problem is formulated as a multi-objective optimization based on the combined function-uncertainty-cost model. Genetic algorithm is utilized to solve the multi-objective optimization and a case study is presented to illustrate the methodology
Generating uniform irradiance in the Fresnel region by quasi-optical beam shaping of a millimeter-wave source
, Article Optics Express ; Volume 27, Issue 22 , 2019 , Pages 32135-32146 ; 10944087 (ISSN) ; Ahmadi-Boroujeni, M ; Tehranian, A ; Sharif University of Technology
OSA - The Optical Society
2019
Abstract
In this paper, we report on the design, simulation and measurement of a flat-top beam shaper (FBS) lens for a millimeter-wave (mm-wave) antenna coupled source. The beam shaper is designed to transform the pseudo-Gaussian beam of the mm-wave source into a flat-top beam of sharp roll-off at a specific distance in the Fresnel region. Firstly, relying on the geometrical optics principles, we propose an analytical formulation for the design of lens profiles. Next, a simple optimization method based on the full-wave simulation of the lens and the mm-wave antenna is suggested to tune the analytically extracted lens profile. The optimized lens profile is then studied to assess its performance...
Generating uniform irradiance in the fresnel region by quasi-optical beam shaping of a millimeter-wave source
, Article Optics Express ; Volume 27, Issue 22 , 2019 , Pages 32135-32146 ; 10944087 (ISSN) ; Ahmadi Boroujeni, M ; Tehranian, A ; Sharif University of Technology
OSA - The Optical Society
2019
Abstract
In this paper, we report on the design, simulation and measurement of a flat-top beam shaper (FBS) lens for a millimeter-wave (mm-wave) antenna coupled source. The beam shaper is designed to transform the pseudo-Gaussian beam of the mm-wave source into a flat-top beam of sharp roll-off at a specific distance in the Fresnel region. Firstly, relying on the geometrical optics principles, we propose an analytical formulation for the design of lens profiles. Next, a simple optimization method based on the full-wave simulation of the lens and the mm-wave antenna is suggested to tune the analytically extracted lens profile. The optimized lens profile is then studied to assess its performance...