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Equivalent force control method for generalized real-time substructure testing with implicit integration
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DOI：10.1002/eqe.674.png)
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This paper presents a new method, called the equivalent force control method, for solving the nonlinear equations of motion in a real-time substructure test using an implicit time integration algorithm. The method replaces the numerical iteration in implicit integration with a force-feedback control loop, while displacement control is retained to control the motion of an actuator. The method is formulated in such a way that it represents a unified approach that also encompasses the effective force test method. The accuracy and effectiveness of the method have been demonstrated with numerical simulations of real-time substructure tests with physical substructures represented by spring and damper elements, respectively. The method has also been validated with actual tests in which a Magnetorheological damper was used as the physical substructure. Copyright (c) 2007 John Wiley & Sons, Ltd.
Keyword:
real-time tests
substructure tests
pseudodynamic tests
hybrid simulation
implicit integration
equivalent force control
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