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از دوستان عزیز خواهشمندم در صورت امکان 3 مقاله ذیل را که نیاز مبرم دارم برای من پیدا کنند. پیشاپیش از شما ممنونم.
(1)
On the free vibration of stepped beams
F. Ju, H. P. Lee and K. H. Lee
Department of Mechanical and Production Engineering, National University of Singapore, 10, Kent Ridge Crescent, Singapore 0511
Received 15 October 1993
revised 29 January 1994
Available online 4 March 2003
(2)
Free vibration of stepped beams: Exact and numerical solutions
S.K. Jang and C.W. Bert
School of Aerospace and Mechanical Engineering, The University of Oklahoma, Norman, Oklahoma 73019, U.S.A
Received 4 October 1988
Available online 25 July 2003
(3)
Free vibration of stepped beams: Higher mode frequencies and effects of steps on frequency
S.K. Jang and C.W. Bert
School of Aerospace and Mechanical Engineering, The University of Oklahoma, Norman, Oklahoma 73019, U.S.A
Received 29 November 1988
Available online 24 July 2003
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