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Comparison of adaptive structural damage identification techniques in nonlinear hysteretic vibration isolation systems

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Earthquake Engineering and Engineering Vibration 2013年第4期12卷 659-667页

作者： Mu Tengfei Zhou Li jann n.yang State Key Laboratory of Mechanics and Control of Mechanical Structures Nanjing University of Aeronautics and Astronautics Department of Civil and Environmental Engineering University of California

Early structural damage identification to obtain an accurate condition assessment can assist in the reprioritization of structural retrofitting schedules in order to guarantee structural safety. nowadays, seismic isolation technology has been applied in a wide variety of infrastructure, such as buildings, bridges, etc., and the health conditions of these nonlinear hysteretic vibration isolation systems have received considerable attention. To effectively detect structural damage in vibration isolation systems based on vibration data, three time-domain analysis techniques, referred to as the adaptive extended Kalman filter （AEKF）, adaptive sequential nonlinear least-square estimation （ASnLSE） and adaptive quadratic sum-sqnares error （AQSSE）, have been investigated. In this research, these analysis techniques are compared in terms of accuracy, convergence and efficiency, for structural damage detection using experimental data obtained through a series of laboratory tests based on a base-isolated structural model subjected to E1 Centro and Kobe earthquake excitations. The capability of the AEKF, ASnLSE and AQSSE approaches in tracking structural damage is demonstrated and compared.

关键词： structural health monitoring parameter identification damage tracking nonlinear hysteretic system experimental verification

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Two Processes Comparison by Using Capability Indices Cpm

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厦门大学学报(自然科学版) 2002年第S1期 188-189页

作者： K S Chen,jann-Pygn Chen,T W Chen Department of Industrial Engineering & Management national Chin -Yi Institute of Technology Department of Industrial Engineering & Management national Chin -Yi Institute of Technology Department of Mechanical Engineering national Chin-Yi Institute of Technology Taiwan China

In recent years, there has been mounting interest i n measuring process performance in manufacturing industry. Based on analyzing the process capability indices, a production department can trace and improve a poor process to enhance quality levels and satisfy customers. The process capabilit y analysis can also serve as an important reference for making decisions for imp roving the global quality of all products. Since C p and C pk are failed to account for process centering, the index C pm is developed. The index C pm takes the process centering into consideration and is su itable for the processes with nominal-the-best type. There are other indices l ike C pu and C pl, and those indices are used for unilateral s pecification processes. Chou (1994) developed a procedure using estimators of C p, C pu and C pl for practitioners to determine whether two p rocesses are equal capability or not. For bilateral specifications processes, i ndex C p is failed to measure process yield and process centering. Thus, th e index C pm is used to develop a similar procedure for practitioners t o determine whether two processes are equal capability or not. The decisions mad e using the procedure to select the better supplier are, of course, more reliabl e.

关键词： process capability indices test statistic proce ss yield process centering

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Two Processes Comparison by Using Capability Indices C_(pm)

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厦门大学学报（自然科学版） 2002年第S1期41卷 188-189页

作者： K S Chen jann-Pygn Chen T W Chen Department of Industrial Engineering & Management National Chin -Yi Institute of TechnologyDepartment of Industrial Engineering & ManagementNational Chin -Yi Institute of TechnologyDepartment of Mechanical Engineering National Chin-Yi Institute of Technology Taiwan China

关键词： process capability indices test statistic proce ss yield process centering

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