Real-time testing with dynamic substructuring

Abstract

In this chapter the real-time testing technique which has become known as real-time dynamic substructuring is discussed. A control systems approach is taken to develop stability and robustness criteria for real-time dynamic substructuring tests. In particular we discuss how delay and uncertainty effects in the experimental apparatus can lead to loss of accuracy, or worse, system instability. Models which take account of the delay effects are developed using both delay differential equations and transfer functions. From these models delay compensation schemes can be constructed either using inverse transfer functions or forward prediction methods. Three methods for improving robustness are de..