回首頁回首頁聯絡我們網站導覽English version
中文標題: 地震工程即時複合試驗技術之研究
英文標題: A Study on Real-time Hybrid Testing Method for Earthquake Engineering
編號: NCREE-13-001
語言: 英文
編輯:
媒體型式: 紙本
作者:
陳沛清   蔡克銓   
中文摘要: 即時複合試驗結合了數值模擬與結構試驗兩種方法,基本原理與擬動態試驗相同,唯一不同的地方為此方法並不放慢實驗速度,試體在即時的狀態下運動,在數值模型取得試體反應後即運算出下一個步階位移,並驅動致動器施加目標位移於試體上,反覆進行至試驗結束。此方法可真實反應速度相依型構件在全結構下的真實受震行為。然而系統的時間延遲、致動器控制的精確度、試體與數值模型傳遞資料所需的時間,以及數值方法的運算速度與收斂性能等,皆為影響試驗結果的正確性,亦為相關研究人員極欲解決的問題。
本研究發展二階相位補償器以補償系統延遲,視為獨立於油壓致動系統的外迴圈控制器,並使用了適性控制理論,使此二階補償器能在實驗過程中自動調整其延遲常數,達成有效且即時的延遲補償。此外,為了修正量測位移與目標位移造成的誤差所導致的系統不平衡等效外力,本研究提出了補償恢復力器將此外力於下一個積分步進行修正。
本研究進行了數個即時複合試驗。應用於速度不相依型與速度相依型試體,實驗結果證明,本研究所提出的油壓致動器補償法,能夠得到穩定且準確的即時複合試驗結果。最後,為了更進一步改善致動器控制的精確度,本研究將適性控制理論應用於前饋與回饋控制器方法上,並以一個九層樓的抗彎構架進行即時複合試驗,其控制各樓層加速度反應的磁流變阻尼器由實驗即時控制並量測所得。實驗結果證明藉由適性控制理論的應用,改善了既有的前饋與回饋控制器方法,並提升了即時複合試驗結果的正確性。
此研究所開發的即時複合試驗技術,除了可提供國內研究人員進行地震工程研究的一種新方法,更可節省試體製作的成本,對於節能減碳與永續發展,有莫大的助益。
英文摘要: Real-time hybrid testing is an innovative experimental technique for evaluating the dynamic responses of structural systems under seismic loading. It separates a structure into two substructures: numerical model and physical specimen that is difficult to simulate analytically. Servo-hydraulic actuators, however, have complex dynamics and induce inevitable time lag or delay and magnitude reduction between the command and the achieved displacements. This delay produces a negative damping effect and adds energy into a hybrid test which would result in inaccurate test results or even destabilize the overall structural system. In addition, the accumulative measurement error would result in inaccurate test results. Therefore, real-time hybrid testing requires high quality measurements, accurate control of actuators, and refined signal processing to perform versatile and reliable experiments. To improve the performance of an existing control system, an outer-loop control scheme has been investigated. A second order discrete adaptive phase lead compensator (PLC) has been proposed. It has been proved unconditionally stable as long as the selected weightings are located in the stable regions. Besides, an adaptive delay estimator based on the gradient adaptive law has been adopted to estimate the delay during the test. In addition, a restoring force compensator has been proposed to correct the unbalanced force due to the displacement error. The compensation force is calculated by applying the proposed moving-averaged tangent stiffness method. For rate-independent specimens, real-time hybrid testing on a portal frame has been conducted. The stiffness term is represented by a steel plate. Experimental results have indicated that the dual-compensation scheme can be applied on tests containing rate-independent components stably and accurately. For rate-dependent specimens, real-time hybrid testing on a smart base-isolation system has been performed. The physical specimen is a magneto-rheological (MR) damper which is semi-actively controlled by different control methods. Experimental results have demonstrated that the adaptive second-order PLC can lead to fair test results for rate-dependent components. To further improve the tracking performance of servo-hydraulic systems, an adaptive model-based feedforward-feedback control strategy has been proposed. The accuracy and stability of this control scheme are validated through tracking performance testing and real-time hybrid testing of a nine-story shear building controlled by MR dampers. Experimental results have shown that the proposed adaptive model-based control achieves excellent displacement tracking for the real-time hybrid testing.
關鍵字: real-time hybrid testing, outer-loop control, dual-compensation, adaptive control, base-isolation system, MR damper, model-based control
目錄:
  下載  (176 KB)
全文:
  登入後下載  (6 MB)

[前頁] [頁首]

若您有任何關於網站內容的問題與建議,請聯絡網頁管理員,感謝。
Tel:(02)6630-0888 Fax:(02)6630-0858 Add:(106)台北市辛亥路三段200號
版權所有 2010 國家地震工程研究中心