附加质量放在悬臂粱上的不同位置对梁的固有频率的影响一样吗?
在悬臂梁上有个附加质量,请问附加质量放在悬臂粱上的不同位置对梁的固有频率的影响一样吗?谢谢[此贴子已经被yejet于2006-5-23 21:06:41编辑过]
系统的固有频率与系统的质量.结构和质量分布有关,附加质量位置不同固有频率会不同. 本帖最后由 VibInfo 于 2016-4-25 14:27 编辑
随着集中质量从自由端向固定端移动,悬臂梁的一阶固有频率逐渐提高。
Forced vibrations of a clamped-free beam with a mass at the free end with an external periodic
disturbance acting on the mass with applications in ships’ structures
D.V. Bambill ∗, S.J. Escanes, C.A. Rossit
Department of Engineering, Institute of Applied Mechanics, Universidad Nacional del Sur, 8000 Bahı′a Blanca, Argentina
Ocean Engineering 30 (2003) 1065–1077
Abstract
An exact, analytical solution is obtained for the title problem which constitutes a classical
one although no solution is available in well known textbooks and handbooks normally used by
the structural engineer in several fields of technology: ocean and naval engineering, aerospace
applications, etc. The authors performed this study motivated by a situation where excessive
displacements were noticed in a structural element carrying a relatively small motor at the
free end and placed at the engine room of a naval vessel. The Bernoulli-Euler model has
been employed.
2002 Elsevier Science Ltd. All rights reserved.
Keywords: Analytical solution; Ocean and naval engineering; Aerospace applications; Motor; Engine
room; Bernoulli-Euler
回复:(欧阳中华) 随着集中质量从自由端向固定端移...
本帖最后由 VibInfo 于 2016-4-25 14:29 编辑以下是引用欧阳中华在2006-5-20 15:56:11的发言:
随着集中质量从自由端向固定端移动,悬臂梁的一阶固有频率逐渐提高。
对的对的
可不可以这样理解,因为w=sqrt(k/m)<BR>质量从自由端到固定端的过程,是柔度减小的过程,因此k越来越大,w也越大 本帖最后由 VibInfo 于 2016-4-25 14:29 编辑
振动的频率取决于系统的质量和刚度,包括其大小和分别;多自由度系统各阶模态频率和振型取决于模态质量和模态刚度。
质量从自由端到固定端的过程,是模态质量减小的过程,因此频率越来越大... ...
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