performance limit

Beyond-Bandwidth Control in High-Speed Precision Mechatronics

Customizing control to the performance extreme.

A Multirate Fractional-Order Repetitive Control for Laser-Aided Additive Manufacturing

This paper discusses fractional-order repetitive control (RC) to advance the quality of periodic energy deposition in laser-based additive manufacturing (AM). It addresses an intrinsic RC limitation when the exogenous signal frequency cannot divide …

Transmission of Signal Nonsmoothness and Transient Improvement in Add-On Servo Control

Plug-in or add-on control is integral for high- performance control in modern precision systems. Despite the capability of greatly enhancing the steady-state performance, add-on compensation can introduce output discontinuity and significant …

A Spectral Analysis and Its Implications of Feedback Regulation beyond Nyquist Frequency

Performance of controls beyond the Nyquist frequency.

Pseudo Youla–Kucera parameterization with control of the waterbed effect for local loop shaping

This paper discusses a discrete-time loop shaping algorithm for servo enhancement at multiple wide frequency bands. Such design considerations are motivated by a large class of practical control problems such as vibration rejection, active noise …

Methods for Closed-loop Compensation of Ultra-high Frequency Disturbances in Hard Disk Drives and Hard Disk Drives Utilizing Same

The importance of safe and flexible disturbance rejection at high frequencies has been ever increasing in modem control systems. For example, new applications of hard disk drives (HDD) require that the HDD control system be robust to (e.g., have the …