摘要
为解决工程实践中的低频振动问题,提出了利用柔性基础准零刚度隔振系统对其进行隔离的方法。根据舰船装备实际情况,建立了柔性基础准零刚度隔振系统的动力学模型,利用谐波平衡法和平均法对动力学方程进行了求解,得到了谐波力激励下系统的幅频特性曲线和力传递率。研究了不同激励力幅值、质量比和阻尼比对系统隔振性能的影响。仿真结果表明,相比相应的等效线性隔振系统,通过适当地减小激励幅值和适当地增大质量比、阻尼比,柔性基础准零刚度隔振系统具有更优越的低频隔振性能,隔振起始频率较低,振动衰减率较大。
To solve the low-frequency vibration isolation problems, a quasi-zero stiffness(QZS) vibration isolation system with flexible foundation is proposed in this paper. Based on the actual situation of marine equipment, dynamic model of the vibration isolation system is established; the amplitude-frequency curve and force transmissibility under harmonic force excitation are derived by the harmonic balance method and the average method; the effects on the vibration isolation performance caused by excitation amplitude, mass ratio and damping ratio are discussed. Results show that, compared with the equivalent linear system, QZS system with flexible foundation not only has better isolation performance in low frequency range, but also possesses a wider range of isolation frequency provided that the excitation amplitude, mass ratio and damping ratio are appropriate.
出处
《应用力学学报》
CAS
CSCD
北大核心
2018年第1期70-74,共5页
Chinese Journal of Applied Mechanics
基金
国家自然科学基金资助项目(51509253
51579242
51679245)
关键词
准零刚度
谐波平衡法
平均法
力传递率
隔振系统
quasi-zero stiffness
harmonic balance method
average method
force transmissibility
vibration isolation system
