摘要
以星载飞轮稳定运行和姿态调整过程中瞬态输出扰振抑制为目标,利用欧拉屈曲梁并联线性弹簧构建一种非线性能量阱(NES)。利用所建耦合多自由度系统动力学模型,采用龙格-库塔法得到各部分时程响应曲线,并转化为能量形式对比研究在瞬态载荷和稳态激励下,外部输入能量在飞轮-非线性能量阱-支承结构之间的传递特征,进而判断非线性能量阱发生靶能量传递的初始条件。研究表明:只有在中等强度激励能量作用下,才能使非线性能量阱产生高效的靶能量传递;当能量由支承结构和飞轮组成的线性系统传递到非线性能量阱发生靶能量传递时,将产生覆盖较宽频带的显著振动响应;以实测飞轮系统稳态输出扰动作为输入载荷,安装非线性能量阱可有效抑制飞轮输出扰动的影响。
In order to absorb the vibration from the flywheel, a nonlinear energy sink （NES） is presented in this paper. The NES is composed of a linear spring and the parallel Euler buckled beams. A discrete multi-degree-of-freedom dynamic model, including the flywheel, the NES and the supporting structure is built. The systematic dynamic equations under the transient and steady loadings, respectively, are solved by fourth-order Runge-Kutta method. Based on these calculating results, it is shown that the NES exhibits the efficiency of energy transfer from the linear system, which includes the supporting structure and the flywheel, to the NES. Meanwhile, the targeted energy transfer has been excited. Then, a detailed computational research of the different types of nonlinear energy transitions that occur under the three-level inputting energy is provided. As a result of these studies, the medium-level exciting energy leads to the effective targeted energy transfer from the linear system to the NES. Under this condition, it exhibits that apparent responses of the NES in a wider frequency range. According to the calculating results under the experimental data from the flywheel, it can be concluded that the NES has suppressed the influences from the disturbance of the flywheel effectively.
出处
《宇航学报》
EI
CAS
CSCD
北大核心
2017年第5期490-496,共7页
Journal of Astronautics
基金
国家自然科学基金(51405014)
关键词
非线性能量阱
欧拉屈曲梁
飞轮
振动抑制
Nonlinear energy sink
Euler buckled beam
Flywheel
Vibration suppression
