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A model reference adaptive control based method for actuator delay estimation in real-time testing

Frontiers of Structural and Civil Engineering 2010年第3期4卷 277-286页

作者： Cheng CHEN James M.RICLES School of Engineering San Francisco State UniversitySan FranciscoCA 94132USA ATLSS Engineering Research Center Lehigh UniversityBethlehemPA 18015USA

real-time testing provides a viable experimental technique to evaluate the performance of structural systems subjected to dynamic ***-hydraulic actuators are often utilized to apply calculated displacements from an integration algorithm to the experimental structures in a real-time *** compensation of actuator delay is therefore critical to achieve stable and reliable experimental *** advances in compensation methods based on adaptive control theory enable researchers to accommodate variable actuator delay and achieve good actuator control for real-time ***,these adaptive methods all require time duration for actuator delay *** show that a good actuator delay estimate can help optimize the performance of the adaptive compensation *** rate of adaptation also requires that a good actuator delay estimate be acquired especially for the tests where the peak structural response might occur at the beginning of the *** paper presents a model reference adaptive control based method to identify the parameter of a simplified discrete model for servo-hydraulic dynamics and the resulting compensation *** are conducted using both numerical analysis and experimental results to evaluate the effectiveness of the proposed estimation method.

关键词： real-time testing actuator delay compensation adaptive control MIT rule discrete transfer function

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A formal method to real-time protocol interoperability testing

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Science in China(Series F) 2008年第11期51卷 1723-1744页

作者： WANG ZhiLiang1,3,YIN Xia2,3 & JING ChuanMing2,3 1 Network Research Center,Tsinghua University,Beijing 100084,China 2 Department of Computer Science and Technology,Tsinghua University,Beijing 100084,China 3 Tsinghua National Laboratory for Information Science and Technology(TNList) ,Beijing 100084,China 1. Network Research Center Tsinghua University Beijing 100084 China 3. Tsinghua National Laboratory for Information Science and Technology (TNList) Beijing 100084 China 2. Department of Computer Science and Technology Tsinghua University Beijing 100084 China

Interoperability testing is an important technique to ensure the quality of implementations of network communication protocol. In the next generation Internet protocol, real-time applications should be supported effectively. However, time constraints were not considered in the related studies of protocol interoperability testing, so existing interoperability testing methods are difficult to be applied in real-time protocol interoperability testing. In this paper, a formal method to real-time protocol interoperability testing is proposed. Firstly, a formal model CMpTIOA （communicating multi-port timed input output automata） is defined to specify the system under test （SUT） in real-time protocol interoperability testing; based on this model, timed interoperability relation is then defined. In order to check this relation, a test generation method is presented to generate a parameterized test behavior tree from SUT model; a mechanism of executability pre-determination is also integrated in the test generation method to alleviate state space explosion problem to some extent. The proposed theory and method are then applied in interoperability testing of IPv6 neighbor discovery protocol to show the feasibility of this method.

关键词： protocol testing interoperability testing real-time testing test generation timed input output automata(TIOA)

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