We describe our continuing work on implementing Open GIS Consortium (OGC) compatible Grid Services for the International Solid Earth Research Virtual Observatory. Our initial efforts focused on collecting Earthquake and GPS data from various sources, converting them to GML and enabling query capabilities using pure Web Services approach. We have extended this work by creating Web Services imple...

Background. Gas turbines are highly nonlinear systems, where the widely applied linear controllers based on locally linearized models are of limited use. Method of approach. A simple nonlinear dynamic model is developed that is in a quasi-polynomial form. Nonlinear stability and zero dynamics analysis is applied to find a controller structure for input-output linearization. Results. The estimat...

This paper presents an application of two-parameter robust repetitive control (TPRRC) in disk drive servo control, where the repeatable rrmout (RRO) and non-repeatable runout (NRRO) are rejected simultaneously. The repeatable disturbances are rejected by tbe internal model structure of TPRRC, while the nonrepeatable disturbances are attenuated by the robust performance specification. The design...

In this paper, the Linear Exponential Quadratic Gaussian with Loop Transfer Recovery (LEQG/LTR) methodology is employed for the design of high performance induction motor servo systems. In addition, we design a speed sensorless induction motor vector controlled driver with both the extended Kalman filter and the LEQG/LTR algorithm. The experimental realization of an induction servo system is gi...

An incremental motion control problem, specified by a trapezoidal speed command profile using multisegment sliding mode control (MSSMC), is proposed to control synchronous reluctance motor (SRM) servo drive. Since the control gains in the MSSMC are fixed, chattering responses occur due to large external load disturbances. Therefore, a neural network (ANN) is developed to tune the control gains ...

Fluid pumping losses are one of the major sources of torque loss in modern Continuously Variable Transmissions (CVTs) due to the high pressures and flow rates required in the hydraulic control system. To reduce the magnitude of these losses, researchers at UC Davis have developed a servo-pump control system for CVTs designed for improved pressure and ratio controllability with minimal power con...

A design method based on the internal model control (IMC) theory has been developed for the robust control of a low-power ac induction servo drive in application of highperformance motion control system. Indirect vector control with software current control technique has been developed to achieve fast response decoupling control of the induction motor. An equivalent model representing the contr...

In the recent past, many researchers have developed control algorithms for visual servo applications. In this paper, we introduce a new switching approach, in which a high-level decision maker determines which of two lowlevel visual servo controllers should be used at each control cycle. We introduce two new low-level controllers, one that relies on the homography between initial and goal image...

In this paper, an algorithm for suppression of the torsional oscillations, in the computer controlled servo systems, is purposed. A few modification of the IMPACT structure (Internal Model Principle and Control Together) in the digitally controlled electrical drives are proposed. The IMPACT structure suitable for suppression of the torsional oscillations in a servo system with the flexible coup...