含三次非线性阻尼特性的分子弹簧隔振系统

摘要

Here,theoretical analysis and simulation for vibration isolation performances of molecular spring isolation systems with cubic nonlinear viscous damping were conducted.Molecular spring isolator is a novel vibration isolator with high-static-low-dynamic stiffness property.To build a vibration isolation system with both high-static-lowdynamic stiffness property and a nonlinear damping one,a MR damper and a molecular spring isolator were connected in parallel,the MR damper implemented the PI feed-back control method to simulate the desired cubic nonlinear damping property.The effects of cubic nonlinear damping on vibration isolation performances of the system were studied using dynamic simulation and theoretical analysis.The vibration isolation mechanism of the cubic nonlinear damping was analyzed with the harmonic balance method.The results showed that the cubic nonlinear damping property can isolate the transmission of forces,effectively reduce resonant force peaks and not change the vibration isolation performances of vibration isolation frequency areas,but it can't isolate the transmission of vibration displacement amplitudes.%对含有三次非线性阻尼特性的分子弹簧隔振系统的隔振性能进行了仿真研究和理论分析.分子弹簧隔振器是一种具有高静低动刚度特性的新型隔振器,将MR阻尼器和分子弹簧隔振器并联,并对MR阻尼器实施PI反馈控制来模拟指定的三次非线性阻尼特性,得到兼具高静低动刚度特性和非线性阻尼特性的隔振系统.通过动力学仿真和理论分析研究了三次非线性阻尼特性对分子弹簧隔振系统的隔振性能的影响,通过谐波平衡法深入分析三次阻尼特性的隔振机理.结果表明:三次非线性阻尼特性适用于隔力,可有效抑制共振峰值同时不改变隔振频率区的隔振性能,而三次阻尼特性不适合于隔幅.