We overview a recent research activity where suitable reset actions induce stability and
performance of PID-controlled positioning systems suffering from nonlinear frictional effects …

Friction nonlinearity near zero velocity causes substantial tracking errors during joint motion
reversals. For hybrid robots, this phenomenon is further influenced by joint acceleration and …

Friction deteriorates speed and position control accuracy of high-precision machine tools
and causes distortion phenomenon when the speed crosses zero. In this article, a new …

The frequency response analysis describes the steady-state responses of a system to
sinusoidal inputs at different frequencies, providing control engineers with an effective tool …

In this article, a coupled axial-torsional drill-string vibration model is established, which
considers the influence of bit balling on rock-breaking and drill-string vibration. First, a bit …

This work presents the use of the area of Allan VARiance (AVAR) as an alternate measure
for Mean Squared Error (MSE) to select an optimal Moving Average (MA) filter that …

In order to mitigate the substantial influence of nonlinear friction torque on the performance
of permanent magnet synchronous motor (PMSM)-based servo systems, this article …

This article proposes an analysis method for coupled axial-torsional drill-string vibration
based on fuzzy comprehensive evaluation of rock strength, utilizing identified axial and …

Control engineering is one of the main enablers of technological innovations that are at the
heart of our modern way of life. Some example technologies include wafer scanners that are …

In precise control applications, estimating the friction under operating conditions would
greatly improve the control performance. In literature, especially for pneumatic actuators, the …