The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
The paper presents a robust feedback control method to suppress the vibration and squeal noise phenomenon in disc brake model using an active force control (AFC) strategy. A two degree-of-freedom (2-DOF) Wagner model was considered in the study as the main dynamical element to be controlled. The system was tested for robustness and effectiveness in reducing the vibration and squeal, taking into account...
As we know that the recording density is increasing at an impressive annual rate of 100%, and the access time is decreasing; very soon, the storage density of Harddisk drive will cross 1 Terra bit per square inch. The VCM actuator used in the conventional disk drives has hundreds of flexible resonances at high frequencies, which limit the increase of bandwidth and hence the positioning accuracy. In...
This paper presents a new and novel method to control a 3-RRR (revolute-revolute-revolute) planar parallel manipulator using an active force control (AFC) strategy. A traditional proportional-integral-derivative (PID) controller was first designed and developed to demonstrate the basic and stable response of the manipulator in performing trajectory tracking tasks. Later, the AFC section was incorporated...
Several different control algorithms for high-order inertial system were researched recently in China. Since different algorithms have similar effects, the consistency of these algorithms was first proposed in this paper in the view of control principle. The superheated steam temperature system of a 600 MW unit was taken as an object. The characteristics of time domain and frequency domain, spectrum...
An ion polymer metal composite (IPMC) is an Electro-Active Polymer (EAP) that bends in response to a small applied electrical field as a result of mobility of cations in the polymer network and vice versa. Recently, IPMC is widely applied in many fields such as biometric, biomedical and micro manipulator fields. This paper proposes a robust position controller for IPMCs which is based on the quantitative...
Vibration reduction in flexible systems can be achieved by shaping the input command using time-delay filters designed for time-optimality, vibration cancellation of characteristic modes, or control robustness. Fast settling time with limited control requires application of bang-bang control which often excite the higher modes of unmodeled dynamics. In this paper an approach is presented to improve...
The performance of systems that exhibit repetitive disturbances can be significantly improved using repetitive control (RC). If the period-time of the repetitive disturbance is exactly known and constant in time, perfect asymptotic disturbance rejection can be achieved. In this paper, we apply RC to a high-precision stage driven by a walking piezo actuator with four bimorph piezoelectric legs. The...
Dealing with a multivariable non-minimum phase model of a boiler system, a LQG/LTR controller is designed which is well-known for its optimality and robustness. Firstly, the loop transfer function is shaped using LQG method; then, an observer is proposed with the aim of loop transfer recovery. Consequently, the designed controller is reduced to the lowest possible order for the sake of implementation...
In this paper, active force control with fuzzy logic (AFCFL) technique is applied to the control of a fluidic muscle (also known as pneumatic artificial muscle or PAM) that acts as an actuator to drive a trolley system in a laboratory setting. Since, fluidic muscle has a high tension force, high power/weight ratio, high strength, and cleanliness, ease of maintenance, low cost, compactness and cheap...
The paper describes a neuro active force control (NAFC) method that is applied to control a vertical moving mass (trolley) actuated by a fluidic muscle or pneumatic artificial muscle (PAM). The NAFC is in effect coupled to a proportional-integral-derivative (PID) controller and was practically implemented on a physical test rig that was developed in the laboratory. The effectiveness of the proposed...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.