Scientific Research Publishing

Read full paper at: http://www.scirp.org/journal/PaperInformation.aspx?PaperID=51403#.VGlTnGfHRK0 Author(s)   Walter F. Schmidt 1* , Cathleen J. Hapeman 1 , James Wachira 2 , Clayton G. Thomas 3 Affiliation(s) 1 United State Department of Agriculture, Agricultural Research Service, Beltsville, Maryland, USA . 2 Department of Biology, School of Computer, Mathematical, and Natural Sciences, Morgan State University, Baltimore, Maryland, USA . 3 Clarence M. Mitchell Jr. School of Engineering, Morgan State University, Baltimore, Maryland, USA . ABSTRACT A 3-D electrostatic density map generated using the Wavefront Topology System and Finite Element Method clearly demonstrates the non-uniformity and periodicity...

Read full paper at: http://www.scirp.org/journal/PaperInformation.aspx?PaperID=48163#.VEXvdlfHRK0 Author(s)    Chi-Wei Lin Affiliation(s) Department of Industrial Engineering and Systems Management, Feng Chia University, Taichung, Taiwan . ABSTRACT This paper has developed a genetic algorithm (GA) optimization approach to search for the optimal locations to install bearings on the motorized spindle shaft to maximize its first-mode natural frequency (FMNF). First, a finite element method (FEM) dynamic model of the spindle-bearing system is formulated, and by solving the eigenvalue problem derived from the equations of motion, the natural frequencies of the spindle system can be acquired. Next, the mathem...