Proportional control

About: Proportional control is a research topic. Over the lifetime, 3756 publications have been published within this topic receiving 49050 citations.

A Variable Structure Approach to Robust Control of VTOL Aircraft

Abstract: This paper examines the application of variable structure control theory to the design of a flight control system for the AV-8A Harrier in a hover mode The objective in variable structure design is to confine the motion to a subspace of the total state space The motion in this subspace is insensitive to system parameter variations and external disturbances that lie in the range space of the control A switching type of control law results from the design procedure The control system was designed to track a vector velocity command defined in the body frame For comparison purposes, a proportional controller was designed using optimal linear regulator theory Both control designs were first evaluated for transient response performance using a linearized model, then a nonlinear simulation study of a hovering approach to landing was conducted Wind turbulence was modeled using a 1052 destroyer class air wake model

Re-thinking the robust control of robot manipulators

Abstract: The authors describe two classes of robust controllers for the tracking of robot motion. The controllers are simple linear proportional derivative (PD) controllers plus a nonlinear term that compensates for the uncertainties present in the manipulator dynamic equation. The main result is that it is explicitly shown that the response of the tracking error can be modified by adjusting the control parameters. The corresponding stability result for the tracking error for the two classes of controllers presented are global uniform ultimate boundedness and global exponential stability. >

Exact Linearization Control for a pneumatic proportional pressure control valve

Abstract: This paper deals with the design and application of the Exact-Linearization Control method to a 3/3 pneumatic proportional pressure control valve. Based on the nonlinear dynamic model of the valve, a control law will be derived which guarantees a specified closed loop response. The chosen approach is characterized by adaptive properties because the connected volume is regarded in the control algorithm. The response of the valve to setpoint changes under different working conditions and its disturbance behaviour are presented by some experimental results, which are clearly illustrating the effectiveness of the proposed control strategy.

Control of spinning flexible spacecraft by modal synthesis

Abstract: A procedure is presented for the active control of a spinning flexible spacecraft. Such a system exhibits gyroscopic effects. The design of the controller is based on modal decomposition of the gyroscopic system. This modal decoupling procedure leads to a control mechanism implemented in modular form, which represents a distinct computational advantage over the control of the coupled system. Design procedures are demonstrated for two types of control algorithms, linear and nonlinear. The first represents classical linear feedback approach, and the second represents an application of on-off control, both types made feasible by the modal decomposition scheme.