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Cheng Chen - One of the best experts on this subject based on the ideXlab platform.

  • An Unconditionally Stable Explicit Integration Algorithm with Controllable Numerical Damping for Real-Time Testing
    Structures Congress 2010, 2010
    Co-Authors: Cheng Chen, James M Ricles
    Abstract:

    Integration Algorithms are typically utilized in structural dynamics to obtain the solution to temporally discretized equations of motion. Stability is an important property to be considered when selecting the proper Integration Algorithm for analysis of structures with a large number of degrees of freedom. The recent development of real-time structural testing brings more challenges to the Integration Algorithm. An explicit Integration Algorithm is more favorable in realtime testing because of its computational efficiency. However, the presence of numerical errors will lead to the spurious growth of high-frequency response in the dynamic analysis and the presence of inevitable experimental errors will aggravate this effect in real-time structural testing. It is therefore advantageous for an explicit Algorithm to possess controllable numerical damping to suppress any spurious participation of the high-frequency response while the lower modes can be integrated accurately. This paper presents the development of a family of explicit Integration Algorithms with controllable numerical damping. The properties of the proposed Algorithm are investigated and compared with other well established Algorithms.

  • real time hybrid testing using the unconditionally stable explicit cr Integration Algorithm
    Earthquake Engineering & Structural Dynamics, 2009
    Co-Authors: Cheng Chen, James M Ricles, Thomas Marullo, Oya Mercan
    Abstract:

    SUMMARY Real-time hybrid testing combines experimental testing and numerical simulation, and provides a viable alternative for the dynamic testing of structural systems. An Integration Algorithm is used in real-time hybrid testing to compute the structural response based on feedback restoring forces from experimental and analytical substructures. Explicit Integration Algorithms are usually preferred over implicit Algorithms as they do not require iteration and are therefore computationally efficient. The time step size for explicit Integration Algorithms, which are typically conditionally stable, can be extremely small in order to avoid numerical stability when the number of degree-of-freedom of the structure becomes large. This paper presents the implementation and application of a newly developed unconditionally stable explicit Integration Algorithm for real-time hybrid testing. The development of the Integration Algorithm is briefly reviewed. An extrapolation procedure is introduced in the implementation of the Algorithm for real-time testing to ensure the continuous movement of the servo-hydraulic actuator. The stability of the implemented Integration Algorithm is investigated using control theory. Real-time hybrid test results of single-degree-of-freedom and multi-degree-of-freedom structures with a passive elastomeric damper subjected to earthquake ground motion are presented. The explicit Integration Algorithm is shown to enable the exceptional real-time hybrid test results to be achieved. Copyright q 2008 John Wiley & Sons, Ltd.

  • Real‐time hybrid testing using the unconditionally stable explicit CR Integration Algorithm
    Earthquake Engineering & Structural Dynamics, 2009
    Co-Authors: Cheng Chen, James M Ricles, Thomas Marullo, Oya Mercan
    Abstract:

    SUMMARY Real-time hybrid testing combines experimental testing and numerical simulation, and provides a viable alternative for the dynamic testing of structural systems. An Integration Algorithm is used in real-time hybrid testing to compute the structural response based on feedback restoring forces from experimental and analytical substructures. Explicit Integration Algorithms are usually preferred over implicit Algorithms as they do not require iteration and are therefore computationally efficient. The time step size for explicit Integration Algorithms, which are typically conditionally stable, can be extremely small in order to avoid numerical stability when the number of degree-of-freedom of the structure becomes large. This paper presents the implementation and application of a newly developed unconditionally stable explicit Integration Algorithm for real-time hybrid testing. The development of the Integration Algorithm is briefly reviewed. An extrapolation procedure is introduced in the implementation of the Algorithm for real-time testing to ensure the continuous movement of the servo-hydraulic actuator. The stability of the implemented Integration Algorithm is investigated using control theory. Real-time hybrid test results of single-degree-of-freedom and multi-degree-of-freedom structures with a passive elastomeric damper subjected to earthquake ground motion are presented. The explicit Integration Algorithm is shown to enable the exceptional real-time hybrid test results to be achieved. Copyright q 2008 John Wiley & Sons, Ltd.

  • development of direct Integration Algorithms for structural dynamics using discrete control theory
    Journal of Engineering Mechanics-asce, 2008
    Co-Authors: Cheng Chen, James M Ricles
    Abstract:

    In structural dynamics, Integration Algorithms are often used to obtain the solution of temporally discretized equations of motion at selected time steps. Various time Integration Algorithms have been developed in the time domain using different methods. In order for an Integration Algorithm to be reliable it must be stable and accurate. A discrete transfer function is used to study the properties of Integration Algorithms. A pole mapping rule from control theory in conjunction with a discrete transfer function is used to develop new Integration Algorithms for obtaining solutions to structural dynamics problems. A new explicit Integration Algorithm, called the CR (Chen and Ricles) Algorithm, is subsequently developed based on the proposed method. The properties of the Algorithm are investigated and compared with other well established Algorithms such as the Newmark family of Integration Algorithms. By assigning proper stable poles to the discrete transfer function the newly developed CR explicit Algorithm is unconditionally stable and has the same accuracy as the Newmark method with constant acceleration. In addition, the CR Algorithm is based on expressions for displacement and velocity that are both explicit in form, making it an appealing Integration Algorithm for solving structural dynamics problems.

  • Stability analysis of SDOF real‐time hybrid testing systems with explicit Integration Algorithms and actuator delay
    Earthquake Engineering & Structural Dynamics, 2008
    Co-Authors: Cheng Chen, James M Ricles
    Abstract:

    Real-time hybrid testing is a method that combines experimental substructure(s) representing component(s) of a structure with a numerical model of the remaining part of the structure. These substructures are combined with the Integration Algorithm for the test and the servo-hydraulic actuator to form the real-time hybrid testing system. The inherent dynamics of the servo-hydraulic actuator used in real-time hybrid testing will give rise to a time delay, which may result in a degradation of accuracy of the test, and possibly render the system to become unstable. To acquire a better understanding of the stability of a real-time hybrid test with actuator delay, a stability analysis procedure for single-degree-of-freedom structures is presented that includes both the actuator delay and an explicit Integration Algorithm. The actuator delay is modeled by a discrete transfer function and combined with a discrete transfer function representing the Integration Algorithm to form a closed-loop transfer function for the real-time hybrid testing system. The stability of the system is investigated by examining the poles of the closed-loop transfer function. The effect of actuator delay on the stability of a real-time hybrid test is shown to be dependent on the structural parameters as well as the form of the Integration Algorithm. The stability analysis results can have a significant difference compared with the solution from the delay differential equation, thereby illustrating the need to include the Integration Algorithm in the stability analysis of a real-time hybrid testing system. Copyright © 2007 John Wiley & Sons, Ltd.

James M Ricles - One of the best experts on this subject based on the ideXlab platform.

  • An Unconditionally Stable Explicit Integration Algorithm with Controllable Numerical Damping for Real-Time Testing
    Structures Congress 2010, 2010
    Co-Authors: Cheng Chen, James M Ricles
    Abstract:

    Integration Algorithms are typically utilized in structural dynamics to obtain the solution to temporally discretized equations of motion. Stability is an important property to be considered when selecting the proper Integration Algorithm for analysis of structures with a large number of degrees of freedom. The recent development of real-time structural testing brings more challenges to the Integration Algorithm. An explicit Integration Algorithm is more favorable in realtime testing because of its computational efficiency. However, the presence of numerical errors will lead to the spurious growth of high-frequency response in the dynamic analysis and the presence of inevitable experimental errors will aggravate this effect in real-time structural testing. It is therefore advantageous for an explicit Algorithm to possess controllable numerical damping to suppress any spurious participation of the high-frequency response while the lower modes can be integrated accurately. This paper presents the development of a family of explicit Integration Algorithms with controllable numerical damping. The properties of the proposed Algorithm are investigated and compared with other well established Algorithms.

  • real time hybrid testing using the unconditionally stable explicit cr Integration Algorithm
    Earthquake Engineering & Structural Dynamics, 2009
    Co-Authors: Cheng Chen, James M Ricles, Thomas Marullo, Oya Mercan
    Abstract:

    SUMMARY Real-time hybrid testing combines experimental testing and numerical simulation, and provides a viable alternative for the dynamic testing of structural systems. An Integration Algorithm is used in real-time hybrid testing to compute the structural response based on feedback restoring forces from experimental and analytical substructures. Explicit Integration Algorithms are usually preferred over implicit Algorithms as they do not require iteration and are therefore computationally efficient. The time step size for explicit Integration Algorithms, which are typically conditionally stable, can be extremely small in order to avoid numerical stability when the number of degree-of-freedom of the structure becomes large. This paper presents the implementation and application of a newly developed unconditionally stable explicit Integration Algorithm for real-time hybrid testing. The development of the Integration Algorithm is briefly reviewed. An extrapolation procedure is introduced in the implementation of the Algorithm for real-time testing to ensure the continuous movement of the servo-hydraulic actuator. The stability of the implemented Integration Algorithm is investigated using control theory. Real-time hybrid test results of single-degree-of-freedom and multi-degree-of-freedom structures with a passive elastomeric damper subjected to earthquake ground motion are presented. The explicit Integration Algorithm is shown to enable the exceptional real-time hybrid test results to be achieved. Copyright q 2008 John Wiley & Sons, Ltd.

  • Real‐time hybrid testing using the unconditionally stable explicit CR Integration Algorithm
    Earthquake Engineering & Structural Dynamics, 2009
    Co-Authors: Cheng Chen, James M Ricles, Thomas Marullo, Oya Mercan
    Abstract:

    SUMMARY Real-time hybrid testing combines experimental testing and numerical simulation, and provides a viable alternative for the dynamic testing of structural systems. An Integration Algorithm is used in real-time hybrid testing to compute the structural response based on feedback restoring forces from experimental and analytical substructures. Explicit Integration Algorithms are usually preferred over implicit Algorithms as they do not require iteration and are therefore computationally efficient. The time step size for explicit Integration Algorithms, which are typically conditionally stable, can be extremely small in order to avoid numerical stability when the number of degree-of-freedom of the structure becomes large. This paper presents the implementation and application of a newly developed unconditionally stable explicit Integration Algorithm for real-time hybrid testing. The development of the Integration Algorithm is briefly reviewed. An extrapolation procedure is introduced in the implementation of the Algorithm for real-time testing to ensure the continuous movement of the servo-hydraulic actuator. The stability of the implemented Integration Algorithm is investigated using control theory. Real-time hybrid test results of single-degree-of-freedom and multi-degree-of-freedom structures with a passive elastomeric damper subjected to earthquake ground motion are presented. The explicit Integration Algorithm is shown to enable the exceptional real-time hybrid test results to be achieved. Copyright q 2008 John Wiley & Sons, Ltd.

  • development of direct Integration Algorithms for structural dynamics using discrete control theory
    Journal of Engineering Mechanics-asce, 2008
    Co-Authors: Cheng Chen, James M Ricles
    Abstract:

    In structural dynamics, Integration Algorithms are often used to obtain the solution of temporally discretized equations of motion at selected time steps. Various time Integration Algorithms have been developed in the time domain using different methods. In order for an Integration Algorithm to be reliable it must be stable and accurate. A discrete transfer function is used to study the properties of Integration Algorithms. A pole mapping rule from control theory in conjunction with a discrete transfer function is used to develop new Integration Algorithms for obtaining solutions to structural dynamics problems. A new explicit Integration Algorithm, called the CR (Chen and Ricles) Algorithm, is subsequently developed based on the proposed method. The properties of the Algorithm are investigated and compared with other well established Algorithms such as the Newmark family of Integration Algorithms. By assigning proper stable poles to the discrete transfer function the newly developed CR explicit Algorithm is unconditionally stable and has the same accuracy as the Newmark method with constant acceleration. In addition, the CR Algorithm is based on expressions for displacement and velocity that are both explicit in form, making it an appealing Integration Algorithm for solving structural dynamics problems.

  • Stability analysis of SDOF real‐time hybrid testing systems with explicit Integration Algorithms and actuator delay
    Earthquake Engineering & Structural Dynamics, 2008
    Co-Authors: Cheng Chen, James M Ricles
    Abstract:

    Real-time hybrid testing is a method that combines experimental substructure(s) representing component(s) of a structure with a numerical model of the remaining part of the structure. These substructures are combined with the Integration Algorithm for the test and the servo-hydraulic actuator to form the real-time hybrid testing system. The inherent dynamics of the servo-hydraulic actuator used in real-time hybrid testing will give rise to a time delay, which may result in a degradation of accuracy of the test, and possibly render the system to become unstable. To acquire a better understanding of the stability of a real-time hybrid test with actuator delay, a stability analysis procedure for single-degree-of-freedom structures is presented that includes both the actuator delay and an explicit Integration Algorithm. The actuator delay is modeled by a discrete transfer function and combined with a discrete transfer function representing the Integration Algorithm to form a closed-loop transfer function for the real-time hybrid testing system. The stability of the system is investigated by examining the poles of the closed-loop transfer function. The effect of actuator delay on the stability of a real-time hybrid test is shown to be dependent on the structural parameters as well as the form of the Integration Algorithm. The stability analysis results can have a significant difference compared with the solution from the delay differential equation, thereby illustrating the need to include the Integration Algorithm in the stability analysis of a real-time hybrid testing system. Copyright © 2007 John Wiley & Sons, Ltd.

Oya Mercan - One of the best experts on this subject based on the ideXlab platform.

  • real time hybrid testing using the unconditionally stable explicit cr Integration Algorithm
    Earthquake Engineering & Structural Dynamics, 2009
    Co-Authors: Cheng Chen, James M Ricles, Thomas Marullo, Oya Mercan
    Abstract:

    SUMMARY Real-time hybrid testing combines experimental testing and numerical simulation, and provides a viable alternative for the dynamic testing of structural systems. An Integration Algorithm is used in real-time hybrid testing to compute the structural response based on feedback restoring forces from experimental and analytical substructures. Explicit Integration Algorithms are usually preferred over implicit Algorithms as they do not require iteration and are therefore computationally efficient. The time step size for explicit Integration Algorithms, which are typically conditionally stable, can be extremely small in order to avoid numerical stability when the number of degree-of-freedom of the structure becomes large. This paper presents the implementation and application of a newly developed unconditionally stable explicit Integration Algorithm for real-time hybrid testing. The development of the Integration Algorithm is briefly reviewed. An extrapolation procedure is introduced in the implementation of the Algorithm for real-time testing to ensure the continuous movement of the servo-hydraulic actuator. The stability of the implemented Integration Algorithm is investigated using control theory. Real-time hybrid test results of single-degree-of-freedom and multi-degree-of-freedom structures with a passive elastomeric damper subjected to earthquake ground motion are presented. The explicit Integration Algorithm is shown to enable the exceptional real-time hybrid test results to be achieved. Copyright q 2008 John Wiley & Sons, Ltd.

  • Real‐time hybrid testing using the unconditionally stable explicit CR Integration Algorithm
    Earthquake Engineering & Structural Dynamics, 2009
    Co-Authors: Cheng Chen, James M Ricles, Thomas Marullo, Oya Mercan
    Abstract:

    SUMMARY Real-time hybrid testing combines experimental testing and numerical simulation, and provides a viable alternative for the dynamic testing of structural systems. An Integration Algorithm is used in real-time hybrid testing to compute the structural response based on feedback restoring forces from experimental and analytical substructures. Explicit Integration Algorithms are usually preferred over implicit Algorithms as they do not require iteration and are therefore computationally efficient. The time step size for explicit Integration Algorithms, which are typically conditionally stable, can be extremely small in order to avoid numerical stability when the number of degree-of-freedom of the structure becomes large. This paper presents the implementation and application of a newly developed unconditionally stable explicit Integration Algorithm for real-time hybrid testing. The development of the Integration Algorithm is briefly reviewed. An extrapolation procedure is introduced in the implementation of the Algorithm for real-time testing to ensure the continuous movement of the servo-hydraulic actuator. The stability of the implemented Integration Algorithm is investigated using control theory. Real-time hybrid test results of single-degree-of-freedom and multi-degree-of-freedom structures with a passive elastomeric damper subjected to earthquake ground motion are presented. The explicit Integration Algorithm is shown to enable the exceptional real-time hybrid test results to be achieved. Copyright q 2008 John Wiley & Sons, Ltd.

H. Baaser - One of the best experts on this subject based on the ideXlab platform.

Thomas Marullo - One of the best experts on this subject based on the ideXlab platform.

  • real time hybrid testing using the unconditionally stable explicit cr Integration Algorithm
    Earthquake Engineering & Structural Dynamics, 2009
    Co-Authors: Cheng Chen, James M Ricles, Thomas Marullo, Oya Mercan
    Abstract:

    SUMMARY Real-time hybrid testing combines experimental testing and numerical simulation, and provides a viable alternative for the dynamic testing of structural systems. An Integration Algorithm is used in real-time hybrid testing to compute the structural response based on feedback restoring forces from experimental and analytical substructures. Explicit Integration Algorithms are usually preferred over implicit Algorithms as they do not require iteration and are therefore computationally efficient. The time step size for explicit Integration Algorithms, which are typically conditionally stable, can be extremely small in order to avoid numerical stability when the number of degree-of-freedom of the structure becomes large. This paper presents the implementation and application of a newly developed unconditionally stable explicit Integration Algorithm for real-time hybrid testing. The development of the Integration Algorithm is briefly reviewed. An extrapolation procedure is introduced in the implementation of the Algorithm for real-time testing to ensure the continuous movement of the servo-hydraulic actuator. The stability of the implemented Integration Algorithm is investigated using control theory. Real-time hybrid test results of single-degree-of-freedom and multi-degree-of-freedom structures with a passive elastomeric damper subjected to earthquake ground motion are presented. The explicit Integration Algorithm is shown to enable the exceptional real-time hybrid test results to be achieved. Copyright q 2008 John Wiley & Sons, Ltd.

  • Real‐time hybrid testing using the unconditionally stable explicit CR Integration Algorithm
    Earthquake Engineering & Structural Dynamics, 2009
    Co-Authors: Cheng Chen, James M Ricles, Thomas Marullo, Oya Mercan
    Abstract:

    SUMMARY Real-time hybrid testing combines experimental testing and numerical simulation, and provides a viable alternative for the dynamic testing of structural systems. An Integration Algorithm is used in real-time hybrid testing to compute the structural response based on feedback restoring forces from experimental and analytical substructures. Explicit Integration Algorithms are usually preferred over implicit Algorithms as they do not require iteration and are therefore computationally efficient. The time step size for explicit Integration Algorithms, which are typically conditionally stable, can be extremely small in order to avoid numerical stability when the number of degree-of-freedom of the structure becomes large. This paper presents the implementation and application of a newly developed unconditionally stable explicit Integration Algorithm for real-time hybrid testing. The development of the Integration Algorithm is briefly reviewed. An extrapolation procedure is introduced in the implementation of the Algorithm for real-time testing to ensure the continuous movement of the servo-hydraulic actuator. The stability of the implemented Integration Algorithm is investigated using control theory. Real-time hybrid test results of single-degree-of-freedom and multi-degree-of-freedom structures with a passive elastomeric damper subjected to earthquake ground motion are presented. The explicit Integration Algorithm is shown to enable the exceptional real-time hybrid test results to be achieved. Copyright q 2008 John Wiley & Sons, Ltd.