caa a22 4500 475823095 CHVBK 20180406123824.0 cr unu---uuuuu 170329e20000401xx s 000 0 eng 10.1007/s003660050032 doi (NATIONALLICENCE)springer-10.1007/s003660050032 Torsional Vibrations of Pre-Twisted Blades using Artificial Neural Network Technology [Elektronische Daten] [M. A. Rao, J. Srinivas] Abstract.: The free torsional vibrations of a linearly tapered, twisted flexible blade, rotationally constrained at an arbitrary position along the length of blade, have been investigated using neural networks. The blade has a rectangular cross-section with equal taper in the horizontal and vertical planes, in addition to the flexibility at the root portion. The constraint is a rotational spring. The constraint on the blade at an optimum location is designed so as to increase the lowest natural frequency of the blades with considerable root flexibility. The optimum location is determined as the position of the node in the second mode shape of the unconstrained tapered blade with flexible roots. A trained neural network is used to identify the location of the nodal or optimum point for a given blade-taper ratio and root flexibility parameter. The minimum stiffness of the constraint at an optimum position for a maximum raise in the first eigenfrequency is evaluated. Results are presented in tabular and graphical form. Springer-Verlag London Limited, 2000 Key words. Artificial neural networks nationallicence Back propagation algorithm nationallicence Mode shapes nationallicence Root flexibility nationallicence Taper-rotational constraint nationallicence Torsional frequencies nationallicence Rao M. A. Department of Mechanical Engineering, Andhra University, Visakhapatnam, A.P. India, IN aut Srinivas J. Department of Mechanical Engineering, Andhra University, Visakhapatnam, A.P. India, IN aut https://doi.org/10.1007/s003660050032 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s003660050032 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Rao M. A. Department of Mechanical Engineering, Andhra University, Visakhapatnam, A.P. India, IN aut NATIONALLICENCE 700 1- Srinivas J. Department of Mechanical Engineering, Andhra University, Visakhapatnam, A.P. India, IN aut Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer