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This paper deals with the synthesis, design, and comparison of robust H-infinity (H∞) and RST position controllers of Piezoelectric Actuator Drive (PAD). The PAD is an accurate rotary piezoelectric motor that employs the elongation of stack actuators, the micro-toothed ring and the shaft to generate rotation motion. The motor position depends on precise adjustment between motor ring and shaft and...
When using a set of generic head-related transfer functions (HRTFs) for spatial sound rendering, personalisation can be considered to minimise localisation errors. This typically involves tuning the characteristics of the HRTFs or a parametric model according to the listener's anthropometry. However, measuring anthropometric features directly remains a challenge in practical applications, and the...
We propose and evaluate an acoustic crosstalk canceler for binaural sound presentation based on an 8-channel linear loudspeaker array. The system uses traditional LSFI beamforming and path estimation in the mid and low frequency range, respectively. Simulations show a channel separation of around 40 dB over the vast part of the considered frequency range. The channel separation in a real-world implementation...
Most of the modern industries have multivariable processes wherein interactions exist. As the process outputs and inputs are coupled, designing controller for MIMO processes is a challenging task. The effective open-loop transfer functions (EOTFs) between the paired process input-output variables have complex high order dynamics. While many of the decoupling control methods uses effective transfer...
This paper proposes a novel type of fast convergence robust controller for a non-laminated magnetic bearing system whose dynamics is governed by a non-commensurate fractional order model. The key feature of this approach is the use of Fractional Order PID sliding manifolds and the appropriate sliding mode control law developed to assure the robustness. The stability of the closed loop system is ensured...
All real word process are nonlinear in nature, control of such process is still challenging. Two interacting conical tank process is a one such nonlinear process. First order plus dead time model obtained from process. In this paper coefficient diagram method combined with PI controller. Robust controller is designed based on stability index and equivalent time constant which is related to polynomial...
In this paper, the well-known feedback controller design methods schemes such as Direct Synthesis (DS) method and PID design methods are compared. PID controllers are derived from Direct Synthesis (DS) controller by approximating the dead-time for FOPDT process models. In this work, DS and dead-time approximated PID controllers have been designed with various values of desirable closed loop time constants...
This paper deals with the Internal Model Control (IMC) design which is based on the use of a specific controller and extended to the case of linear multivariable underactuated systems. The case of a class of linear underactuated systems with two degrees of underactuation will be considered in order to confirm the effectiveness of the proposed approach to ensure set-point tracking and disturbance rejection...
Series cascade control structure (SCCS) is widely used in process industries as unity feedback configuration fails to reject the load disturbances before the controlled variable deviates from the setpoint. Several variants of the conventional SCCSs have been reported in the literature to obtain improved closed-loop performance as compared to the conventional structure. For processes with large time...
Many PID tuning rules are available for unstable first order plus time delay process. However, most of them are complex. In this work, optimal H2 principles are used along with internal model control (IMC) to develop simple tuning rules for a PID controller. The tuning rules are developed for different time delay to time constant ratios. Maximum sensitivity (Ms) is used for the selection of the IMC...
This paper proposes design of fractional-order controller for a 4-leg inverter using the concept of Bode's ideal loop transfer function. The 4-leg inverters have been increasingly used to cater nonlinear loads and hence there control is a crucial issue. The linear model of 4-leg inverter has poor phase margin resulting in a highly oscillatory time-domain response. The designed controller makes the...
In this paper, a fourth-order non-isolated bidirectional converter is proposed for load power management in low-voltage DC grid. With state-space and discrete-time modeling technique, the proposed bidirectional converter is modeled, and small-signal transfer functions are obtained. A digital compensator is designed using these transfer functions both for the charger and discharging cases. The converter...
A procedure for the design of fully integrated voltage regulators is proposed in this paper, for applications requiring high levels of reliability and robustness. A sensitivity analysis is presented, showing how variations in the values of the components, used for the compensation, affect the loop transfer function. To mitigate the effect of process variations and uncertainty in the inductances and...
Dead times exist in many physical plants. They degrade control performances and may make the plant unstable. A Smith predictor is a classical but commonly used approach to the improvement of the performance of the controller. On the other hand, a symbolic approach is useful for the design of an embedded controller. In this paper, we consider a control problem of a plant with a dead time, whose abstracted...
Efficient and robust control of cardiac pacemaker is essential for providing life-saving control action to regulate Heart Rate (HR) in a dynamic environment. Several controller designs involving proportional-integral-derivative (PID) and fuzzy logic controllers (FLC) have been reported but each have their limitations to face the dynamic challenge of regulating HR. Fractional-order control (FOC) systems...
This paper addresses the extension of the Sinusoidal Input Describing Function (SIDF) analysis for unstable multivariable systems. Contrast to the traditional approach, in this extended methodology the controller for the nonlinear plant is synthesized from the open loop transfer function that is derived from the nominal describing function model of the nonlinear plant via algebraic method. It is the...
The paper reports on the application of full-order ℋ∞ controller and ℋ∞ Fixed-Order Optimisation (HIFOO) controller to a Doubly-Fed Induction Generator wind turbine (DFIG). These controllers use the ℋ∞ mixed sensitivity problem to achieve an enhancement in both, Nominal Performance (NP) and Robust Stability (RS) margins for the uncertain DFIG plant while respecting constraints, such as dynamic tracking...
Low sensitivity and wide control bandwidth are required in order to achieve fast and precise positioning of mechatronic systems. However, it is difficult for the system with multiple vibration models to enlarge control bandwidth while maintaining closed-loop stability and reasonable stability margins. This is because the explicit index for determining control bandwidth has not been proposed. This...
Vibration occurs in numerous important domains, such as the aerospace industry, and has negative effects since it can limit the life span of the devices, cause malfunctioning or even system instability. The necessity of research on vibration suppression in aeroplane wings is important from a scientific and technologic point of view: to provide better, more efficient, robust, cheaper solutions to eliminate...
In this paper we have synthesised the stability and robustness performance of MIMO compensator design for which the whole set of latent-structure can be assignment via the approaches of Block root placement technique. The purpose is to provide a comparative study between the Block pole structures in term of system response, and how can they affect the compensator structure meting a desired criteria.
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