material removal 3D surface roughness parameters BiLSTM CNN Dempster's rule EDM Fault diagnosis Hilbert transform History of engineering & technology IR thermography MFA control PMSM RSM SEM morphology Signal processing Study parameters Technology: general issues Thermal conductivity Ti6Al4V alloy abrasive belt grinding abrasive water jet machining abrasive wear absolute sensitivity active control algebraic modeling anisotropy attention mechanism austenitization autocorrelation function automated fiber placement