Delta approach robust controller for constant turning force regulation

The adaptive implementation of a new robust controller for the constant tur ning-force regulation problem under varying cutting conditions is presented . The discrete-control structure is based on a variable state feedback regu lator obtained using the delta approach optimal control theory. The control ler scheme is robust in the presence of cutting process nonlinearities and parametric disturbances. The proposed adaptive scheme uses an estimation an d controller algorithm including a prior knowledge of the system. A robustn ess analysis shows the effectiveness of the proposed solution. Simulations and experimental results obtained with an industrial lathe show the robustn ess of the proposed solution. (C) 1999 Elsevier Science Ltd. All rights res erved.