This paper presents a model for maximizing the critical speed of a composite drive shaft without the penalty of increasing the total structural mass. Additional constraints include stress, torsional buckling as well as side constraints. The selected design variables are the fiber volume fraction distribution, fiber orientation angle and wall thickness of the shaft. Both continuous and discrete grading patterns have been implemented in the directions through the shaft wall thickness and length. Various power-law mathematical expressions describing material grading have been utilized, where the power exponent was taken as a main design variable. The associated optimization problem have been formulated as nonlinear mathematical programming problem and solved by applying the MATLAB optimization ToolBox routines, which implement the sequential quadratic programming method. A case study including the design optimization of a pinned-pinned slender shaft made of carbon-AS4/epoxy-3501-6 composites is presented. Results have shown that the approach implemented in this study is reasonably efficient to attain improved designs in a reasonable computer time.


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    Title :

    Optimization of composite drive shafts against whirling instability


    Contributors:
    Nasr, M. F. (author) / Maalawi, K. Y. (author) / Badr, M. A. (author)


    Publication date :

    2017-07-01


    Size :

    498535 byte




    Type of media :

    Conference paper


    Type of material :

    Electronic Resource


    Language :

    English



    Whirling shafts

    Morris, J. | Engineering Index Backfile | 1925


    Theoretical and Experimental Studies of Whirling Speeds of Pultruded Composite Shafts

    Echempati, R. / Roby, J. / Katona, J. B. et al. | British Library Conference Proceedings | 1999


    Theoretical and experimental studies of whirling speeds of pultruded composite shafts

    Echempati,R. / Roby,J. / Katona,J.B. et al. | Automotive engineering | 1999


    Theoretical and experimental studies of whirling speeds of pultruded composite shafts

    Echempati,R. / Roby,J. / Katona,J.B. et al. | Automotive engineering | 1999