Nonlinear Response of an Inextensible, Cantilevered Beam Subjected to a Nonconservative Follower Force

Nonlinear Response of an Inextensible, Cantilevered Beam Subjected to a Nonconservative Follower Force
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受到非保守从动力作用的不可延伸悬臂梁的非线性响应

DOI:
10.1115/1.4042324
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发表时间:
2019
影响因子:
2
通讯作者:
Dowell, Earl H.
Dowell, Earl H.
中科院分区:
工程技术4区
文献类型:
--
作者:
McHugh, Kevin A.;Dowell, Earl H.

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由非保守从动力驱动的悬臂梁的动态稳定性先前已因其有趣的动态特性及其在推进器等工程设计中的应用而被研究。然而,大多数文献都考虑线性模型。少量论文考虑了非线性模型。在这里,非线性方程组是从一种新的能量方法推导出来的,该方法适用于作用在其上的从动力的不可延伸悬臂梁。这些方程及时得到了求解,并且与已发表的临界力结果(包括阻尼效应(由线性模型确定))一致。该模型可以轻松确定面内和面外偏转以及约束力。凭借这种对系统动力学的新颖透明性,我们对非线性后临界极限循环振荡 (LCO) 进行了研究,包括集中于强制执行不可扩展性约束的力。
The dynamic stability of a cantilevered beam actuated by a nonconservative follower force has previously been studied for its interesting dynamical properties and its applications to engineering designs such as thrusters. However, most of the literature considers a linear model. A modest number of papers consider a nonlinear model. Here, a system of nonlinear equations is derived from a new energy approach for an inextensible cantilevered beam with a follower force acting upon it. The equations are solved in time, and the agreement is shown with published results for the critical force including the effects of damping (as determined by a linear model). This model readily allows the determination of both in-plane and out-of-plane deflections as well as the constraint force. With this novel transparency into the system dynamics, the nonlinear postcritical limit cycle oscillations (LCO) are studied including a concentration on the force which enforces the inextensibility constraint.
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