Real-Time Testing With Dynamic Substructuring

2008 ◽  
pp. 293-342 ◽  
Author(s):  
David Wagg ◽  
Simon Neild ◽  
Peter Gawthrop
Keyword(s):  
Real Time ◽  
Dynamic Substructuring

The Effect of Interface Delays in Substructuring Experiments

2011 ◽  
Author(s):  
Maria Rosaria Marsico ◽  
David J. Wagg ◽  
Simon A. Neild
Keyword(s):  
Real Time ◽  
Physical Model ◽  
Test Piece ◽  
Full Scale ◽  
Alternative Solution ◽  
Hybrid Testing ◽  
Physical Test ◽  
Time Dynamic ◽  
Control Techniques ◽  
Dynamic Substructuring

Normally, for feasibility reasons, tests must be conducted on scaled structures, although scaling can introduce other issues. An alternative solution is to experimentally test the part of the structure that is of particular interest, at full or closer to full scale, while numerically modeling the remainder of the structure. This method is termed real-time dynamic substructuring or hybrid testing. To complete the substructure interaction the forces required to impose the displacements on the physical model are measured and applied to the model in real-time. One of the key challenges is to compensate for the dynamics associated with the actuators that are imposing the displacements on the physical test-piece. Ideally these actuators would act instantaneously however even with sophisticated control techniques interface errors are inevitable. We used an example system to study the effects of interface error modeled as a delay, on the accuracy of the overall substructuring technique.

scholarly journals Seismic energy response analysis of equipment-structure system via real-time dynamic substructuring shaking table testing

2019 ◽  
Vol 23 (1) ◽  
pp. 37-50 ◽  
Author(s):  
Jihong Bi ◽  
Lanfang Luo ◽  
Nan Jiang
Keyword(s):  
Real Time ◽  
Shaking Table Test ◽  
Seismic Energy ◽  
Shaking Table ◽  
Energy Calculation ◽  
Test Results ◽  
Structure System ◽  
Time Dynamic ◽  
Dynamic Substructuring ◽  
Shaking Table Testing

Dynamic equations are presented that have been deduced for a real-time dynamic substructuring shaking table test of an equipment-structure system, based on the branch mode substructure method. The equipment is adopted as the experimental substructure, which is loaded by the shaking table, while the structure is adopted as the numerical substructure. Real-time data communication occurs between the two substructures during the test. A real-time seismic energy calculation method was proposed for the calculation of energy responses, both in the experimental substructure and the numerical substructure. Taking a representative four-story steel frame/equipment model, real-time dynamic substructuring shaking table tests and overall model tests were executed. The proposed real-time dynamic substructuring shaking table testing method was verified by comparing the test results with shaking table test results for the overall model. The energy responses of each component in the equipment-structure system, using different connection types, also were studied. Changes in the connection types can lead to changes in the energy responses of the equipment-structure system, especially with respect to the equipment. The choice of the connection for the equipment-structure coupled system should take into account the operational performance objective of the equipment.

A Comparison of Runge Kutta and Novel L-Stable Methods for Real-Time Integration Methods for Dynamic Substructuring

2006 ◽  
Author(s):  
Alicia Gonzalez-Buelga ◽  
David Wagg ◽  
Simon Neild ◽  
Oreste S. Bursi
Keyword(s):  
Real Time ◽  
Experimental Testing ◽  
Time Integration ◽  
Delay Compensation ◽  
Real Time Control ◽  
Time Dynamic ◽  
Time Control ◽  
Dynamic Substructuring ◽  
Integration Algorithms ◽  
Runge Kutta

In this paper we compare the performance of Runge-Kutta and novel L-stable real-time (LSRT) integration algorithms for real-time dynamic substructuring testing. Substructuring is a hybrid numerical-experimental testing method which can be used to test critical components in a system experimentally while the remainder of the system is numerically modelled. The physical substructure and the numerical model must interact in real time in order to replicate the behavior of the whole (or emulated) system. The systems chosen for our study are mass-spring-dampers, which have well known dynamics and therefore we can benchmark the performance of the hybrid testing techniques and in particular the numerical integration part of the algorithm. The coupling between the numerical part and experimental part is provided by an electrically driven actuator and a load cell. The real-time control algorithm provides bi-directional coupling and delay compensation which couples together the two parts of the overall system. In this paper we consider the behavior of novel L-stable real-time (LSRT) integration algorithms, which are based on Rosenbrock's method. The new algorithms have considerable advantages over 4th order Runge-Kutta in that they are unconditionally stable, real-time compatible and less computationally intensive. They also offer the possibility of damping out unwanted high frequencies and integrating stiff problems. The paper presents comparisons between 4th order Runge-Kutta and the LSRT integration algorithms using three experimental configurations which demonstrate these properties.

Stability Switches in a Neutral Delay Differential Equation with Application to Real-Time Dynamic Substructuring

2006 ◽  
Vol 5-6 ◽  
pp. 79-84 ◽  
Author(s):  
Y.N. Kyrychko ◽  
K.B. Blyuss ◽  
A. Gonzalez-Buelga ◽  
S.J. Hogan ◽  
David J. Wagg
Keyword(s):  
Real Time ◽  
Closed Loop ◽  
Numerical Models ◽  
Closed Loop System ◽  
Neutral Delay ◽  
Time Dynamic ◽  
Dynamic Substructuring ◽  
Delay Differential ◽  
Mass Spring ◽  
Theoretical Results

In this paper delay differential equations approach is used to model a real-time dynamic substructuring experiment. Real-time dynamic substructuring involves dividing the structure under testing into two or more parts. One part is physically constructed in the lab- oratory and the remaining parts are being replaced by their numerical models. The numerical and physical parts are connected via an actuator. One of the main difficulties of this testing technique is the presence of delay in a closed loop system. We apply real-time dynamic sub- structuring to a nonlinear system consisting of a pendulum attached to a mass-spring-damper. We will show how a delay can have (de)stabilising effect on the behaviour of the whole system. Theoretical results agree very well with experimental data.

Real-Time Dynamic Substructuring Testing of a Bridge Equipped with Friction-Based Seismic Isolators

2012 ◽  
Vol 17 (1) ◽  
pp. 4-14 ◽  
Author(s):  
Cassandra Dion ◽  
Najib Bouaanani ◽  
Robert Tremblay ◽  
Charles-Philippe Lamarche
Keyword(s):  
Real Time ◽  
Time Dynamic ◽  
Dynamic Substructuring

scholarly journals Effects of Equipment-Structure-Soil Interaction on Seismic Response of Equipment and Structure via Real-Time Dynamic Substructuring Shaking Table Testing

2017 ◽  
Vol 2017 ◽  
pp. 1-13 ◽  
Author(s):  
Chongxiang Zhang ◽  
Nan Jiang
Keyword(s):  
Real Time ◽  
Data Communication ◽  
Reliability And Validity ◽  
Shaking Table ◽  
Scale Model ◽  
Time Data ◽  
Earthquake Intensity ◽  
Time Dynamic ◽  
Dynamic Substructuring ◽  
Shaking Table Testing

Equation of motion for an equipment-structure-soil (ESS) interaction system was derived using the branch substructure method. After rearrangement, this equation was applied to real-time dynamic substructuring shaking table (RTDSST) testing of the ESS system. This method adopts the equipment-structure (ES) subsystem as the experimental substructure and a modal reduced soil model as the numerical substructure: the former is tested via the shaking table, and the latter is numerically simulated, while real-time data communication occurs between the two substructures during testing. A scale model of the ESS system was designed and underwent an RTDSST test. The experimental data were found to be consistent with the numerical calculation results, which corroborates the reliability and validity of the proposed testing method. A comparison of the experimental results from different earthquake stages implies that seismic responses of the equipment and structure decreased in general due to the intervention of soil, but the soil effect weakened with earthquake intensity.

scholarly journals The performance of delay compensation in real-time dynamic substructuring

2017 ◽  
pp. 107754631774048 ◽  
Author(s):  
Zhenyun Tang ◽  
Matt Dietz ◽  
Zhenbao Li ◽  
Colin Taylor
Keyword(s):  
Real Time ◽  
Delay Compensation ◽  
Time Dynamic ◽  
Dynamic Substructuring
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