本文選題：超彈性特性　切入點：形狀記憶合金復合懸擺減震系統(tǒng)　出處：《振動與沖擊》2017年11期

【摘要】：系統(tǒng)研究了Ti-Ni形狀記憶合金絲應力-應變曲線、特征點應力、耗能能力、等效阻尼比等隨材料直徑、應變幅值、加載循環(huán)次數(shù)的變化規(guī)律,結果表明:絲材直徑的增加會導致SMA絲力學性能趨于劣化;當應變幅值為6%、加載循環(huán)次數(shù)達15次時,可獲得滯回性能良好、工作穩(wěn)定的SMA絲材。將訓練后所得SMA絲材,利用其超彈性特性,結合調(diào)諧質(zhì)量阻尼器基本工作原理,設計制作了一類可便于拆卸的SMA復合懸擺減震系統(tǒng)。針對該類減震系統(tǒng),完成了相應的性能試驗,分析了該系統(tǒng)自振頻率、質(zhì)量振子與受控結構間的相位關系、等效阻尼力隨振子質(zhì)量、擺桿長度的變化規(guī)律,結果表明:該減震系統(tǒng)在正弦波和真實地震激勵下質(zhì)量振子與受控體結構之間相位關系始終較好的保持在150°~180°之間;同時,等效阻尼力隨外荷載幅值的增大,控制效果更加明顯。綜上,該系統(tǒng)能夠簡便應用于結構振動控制之中,并提供穩(wěn)定、高效的阻尼力,從而保護結構免于強動力災害。
[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.

【作者單位】： 西安建筑科技大學土木工程學院;長安大學建筑學院;
【基金】：國家自然科學基金(51678480) 陜西省工業(yè)攻關項目資助(2014K06-34) 陜西省博士后基金(SX2014120057)
【分類號】：TU352.1

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本文編號：1702482