【摘要】 以铝制圆筒自由梁为研究对象,建立了磁流变阻尼器振动实验系统,研究了磁流变阻尼器对结构振动特性的影响以及磁流变阻尼器的减振特性。比较了在有无磁流变阻尼器和阻尼器控制电压不同的情况下结构的频响函数,分别以正弦信号和随机信号对梁进行激励,测试了梁在阻尼器不同工况条件下的振动响应。研究结果表明:仅在较窄的频段内,磁流变阻尼器能够改变梁的振动特性,降低频响函数的幅值;在结构振动的低频区,磁流变阻尼器减振效果明显,在高频区对结构的振动响应影响不大。更多还原

【Abstract】 A vibration experimental system of a cylindric aluminium beam with magneto-rheological(MR) dampers is established.The influence of the MR damper on the structure vibration behaviour is studied,and the vibration reduction is researched.The frequency response functions of the beam with and without the MR dampers under different control voltage are compared.The beam is excited by sine signals and a random signal respectively and the responses are measured with the MR dampers working in different conditions.The research result shows that the MR damper changes the vibration characteristic of the beam only in a narrow frequency domain,and the vibration reduction performance of the MR damper is significant in the low frequency domain but not so effective in the high frequency domain.更多还原