Ti-Ni形状记忆合金复合悬摆减震系统性能试验研究

发布时间：2018-04-02 23:00

本文选题：超弹性特性　切入点：形状记忆合金复合悬摆减震系统　出处：《振动与冲击》2017年11期

【摘要】：系统研究了Ti-Ni形状记忆合金丝应力-应变曲线、特征点应力、耗能能力、等效阻尼比等随材料直径、应变幅值、加载循环次数的变化规律,结果表明:丝材直径的增加会导致SMA丝力学性能趋于劣化;当应变幅值为6%、加载循环次数达15次时,可获得滞回性能良好、工作稳定的SMA丝材。将训练后所得SMA丝材,利用其超弹性特性,结合调谐质量阻尼器基本工作原理,设计制作了一类可便于拆卸的SMA复合悬摆减震系统。针对该类减震系统,完成了相应的性能试验,分析了该系统自振频率、质量振子与受控结构间的相位关系、等效阻尼力随振子质量、摆杆长度的变化规律,结果表明:该减震系统在正弦波和真实地震激励下质量振子与受控体结构之间相位关系始终较好的保持在150°~180°之间;同时,等效阻尼力随外荷载幅值的增大,控制效果更加明显。综上,该系统能够简便应用于结构振动控制之中,并提供稳定、高效的阻尼力,从而保护结构免于强动力灾害。
[Abstract]:The system of Ti-Ni shape memory alloy wire stress-strain curve, stress characteristics, energy dissipation capacity, equivalent damping ratio with the diameter of the material, strain amplitude, variation of loading cycles shows that increasing wire diameter can lead to mechanical properties of SMA wire tends to deterioration; when the strain amplitude was 6%. The loading cycle number up to 15 times, can obtain good hysteretic performance, SMA wire is stable. The training income SMA wire, using the properties of super elasticity, combined with the basic working principle of tuned mass damper, designed a kind of convenient dismantling SMA composite suspension unloading Pendulum damping system. According to the the damping system, complete the corresponding performance tests, analysis of the natural frequencies of the system, the quality of the oscillator and the phase relation between the controlled structure, the equivalent damping force with vibrator quality variation, pendulum length results show that the damping system in the sine wave The phase relationship between the vibrator and the quality controlled and real seismic excitation structure has better kept between 150 DEG ~180 DEG; at the same time, the equivalent damping force increases with the amplitude of loads, the control effect is more obvious. In conclusion, this system can be easily applied to the vibration control of the structure, and to provide a stable and efficient damping force in order to protect the structure from strong, dynamic disaster.

【作者单位】：西安建筑科技大学土木工程学院;长安大学建筑学院;
【基金】：国家自然科学基金(51678480) 陕西省工业攻关项目资助(2014K06-34) 陕西省博士后基金(SX2014120057)
【分类号】：TU352.1

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