以双层非线性隔振系统为对象,建立两自由度非线性隔振系统的动力学模型,研究在不同激励条件下的动力学特性和隔振效果。分析激励幅值一定的条件下系统响应随激励频率的全局分岔变化规律及其非线性动力学特征,采用优势频率处的能量衰减评估隔振系统对强线谱的隔离效果。计算结果表明,处于混沌状态时优势频率处的线谱强度降低了25.9 dB,验证混沌隔振方法能有效降低结构噪声中的线谱成分。
In this article, a dynamic model of two-degree-of-freedom nonlinear vibration isolation will be established. Bifurcation diagrams of this system with different excitation amplitude will be gained and the dynamic behaviors of bifurcation with different frequencies also will be obtained. On the other way, the reduction of the strong line spectrum will be evaluated by the energy attenuation in the characteristic frequencies. The research reveals that energy of the line spectrum will be reduced 25.9 dB in the characteristic frequencies. By the analysis of isolation effectiveness of the system, we can see that the application of chaos method in line spectrum reduction is perfectly validated.
2016,38(5): 64-68 收稿日期：2015-09-06
DOI：10.3404/j.issn.1672-7619.2016.05.014
分类号：O328
基金项目：国家自然科学基金资助项目(51179197)
作者简介：李爽(1992-),男,硕士研究生,研究方向为振动与噪声控制。
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