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...

Uncertainties in the values of the parameters of a system can originate from the manufacturing tolerances of the system components, which can produce a degree of unreliability in the performance of the system. A systematic framework for realistic reliability assessment of an electro-hydraulic servo system has been presented in this paper with the objective of providing adequate information for ...

This work presents some numerical simulations, performed using AMESim software, for a system composed by two redundant servo-actuators. Certain operating conditions are taken into account these electro-hydrostatic servo-actuators, which coupled to the command surface (aileron) of transport aircraft. We first considered situation slight asymmetries in construction then one servo-actuator fails a...

Feedforward control can significantly improve the performance of industrial motion systems through compensation of the servo error induced by the reference signal. Recently, new feedforward tuning algorithms have been proposed that exploit measured data from previous tasks and a suitable feedforward parametrization to attain high servo performance. The aim of this paper is to formulate a design...

Pneumatic servo actuators are characterized by highly nonlinear dynamics, and as such are well suited to the use of nonlinear control methods requiring measurement of the full state, such as sliding mode control. The requirement of pressure measurement, however, is particularly burdensome, due in large part to the high cost of pressure sensors relative to other components of the servo system. S...

Electric power is mainly derived from a combination of an engine and a motor. The motor converts electrical power into mechanical energy, which is widely used in home appliances and industrial mechanical tools. When addressing specific applications, motor-driven tools generally need to make speed changes or have accurate positioning. In these applications, it is necessary to have a highly effic...

The discrete-time linear quadratic optimal problem with finite final time for a servo-drive system with a brushless or a dc motor is presented. The proposed algorithm allows simplifying the optimal control law implementation. The optimal control ensures a good behavior of the system and the decrease of the energy consumption. Key-Words:Optimal control, Brushless, DC machines, Efficiency, Servo ...

An automatic micro manipulation system (AMMS), which aims at various kinds of operations in the field of bioengineering has been developed. Visual servo control is usually employed to improve the performance of the system. However, the visual information can not be obtained as fast as expected because there is a great amount of computation in image processing. This hinders the formation of clos...

Servo systems, consisting of actuators, drive trains and loads, are commonly used throughout both the robotic and machine tool industries. One important servo problem is the precise position and velocity control of each joint used in a robotic manipulator. Olle of the factors governing performance of such systems is the mism.atch that often exists between motor and load inertias. This paper dis...