scholarly journals Scalable high-precision tuning of photonic resonators by resonant cavity-enhanced photoelectrochemical etching

2017 ◽  
Vol 8 (1) ◽  
Author(s):  
Eduardo Gil-Santos ◽  
Christopher Baker ◽  
Aristide Lemaître ◽  
Sara Ducci ◽  
Carmen Gomez ◽  
...  
Keyword(s):  
Gallium Arsenide ◽  
High Selectivity ◽  
Resonant Cavity ◽  
Collective Phenomena ◽  
Photoelectrochemical Etching ◽  
Tuning Method ◽  
Photonic Lattices ◽  
Communication Devices ◽  
Spectral Alignment ◽  
Tuning Methods

Abstract Photonic lattices of mutually interacting indistinguishable cavities represent a cornerstone of collective phenomena in optics and could become important in advanced sensing or communication devices. The disorder induced by fabrication technologies has so far hindered the development of such resonant cavity architectures, while post-fabrication tuning methods have been limited by complexity and poor scalability. Here we present a new simple and scalable tuning method for ensembles of microphotonic and nanophotonic resonators, which enables their permanent collective spectral alignment. The method introduces an approach of cavity-enhanced photoelectrochemical etching in a fluid, a resonant process triggered by sub-bandgap light that allows for high selectivity and precision. The technique is presented on a gallium arsenide nanophotonic platform and illustrated by finely tuning one, two and up to five resonators. It opens the way to applications requiring large networks of identical resonators and their spectral referencing to external etalons.

scholarly journals High-Order Filtered PID Controller Tuning Based on Magnitude Optimum

Mathematics ◽  
2021 ◽  
Vol 9 (12) ◽  
pp. 1340
Author(s):  
Damir Vrančić ◽  
Mikuláš Huba
Keyword(s):  
A Priori ◽  
Higher Order ◽  
Process Models ◽  
Pid Controllers ◽  
Tuning Method ◽  
Output Noise ◽  
Pid Controller Tuning ◽  
Output Time ◽  
Tuning Methods ◽  
Measured Input

The paper presents a tuning method for PID controllers with higher-order derivatives and higher-order controller filters (HO-PID), where the controller and filter orders can be arbitrarily chosen by the user. The controller and filter parameters are tuned according to the magnitude optimum criteria and the specified noise gain of the controller. The advantages of the proposed approach are twofold. First, all parameters can be obtained from the process transfer function or from the measured input and output time responses of the process as the steady-state changes. Second, the a priori defined controller noise gain limits the amount of HO-PID output noise. Therefore, the method can be successfully applied in practice. The work shows that the HO-PID controllers can significantly improve the control performance of various process models compared to the standard PID controllers. Of course, the increased efficiency is limited by the selected noise gain. The proposed tuning method is illustrated on several process models and compared with two other tuning methods for higher-order controllers.

scholarly journals Analysis of the Soft-Switching Tuning Effect on the Figures of Merit Involved in the Design of a Class-E Amplifier with Finite DC-Feed Inductance

Electronics ◽  
2021 ◽  
Vol 10 (14) ◽  
pp. 1705
Author(s):  
Ingrid Casallas ◽  
Robert Urbina ◽  
Carlos-Ivan Paez-Rueda ◽  
Gabriel Perilla ◽  
Manuel Pérez ◽  
...  
Keyword(s):  
Case Studies ◽  
Output Power ◽  
Soft Switching ◽  
Figures Of Merit ◽  
Tuning Method ◽  
Tuning Process ◽  
Tuning Methods ◽  
Zero Voltage ◽  
Voltage Switching ◽  
Class E

This paper explores the design of a Class-E amplifier with finite DC-feed inductance using three tuning methods. Furthermore, this work quantifies the impacts of the tuning process (referred to in this paper as the tuning effect) on the main figures of merit (FoMs) of this amplifier. The tuning goals were to guarantee two conditions: zero voltage and zero voltage derivative switching (i.e., soft-switching tuning). To the best of the authors’ knowledge, systematic tuning methods have not been analyzed before for this amplifier topology. Two of them are based on the iterative component tuning process, and they have been explored previously in the design of the conventional class-E amplifier with an RF choke inductance. The last tuning method explores the simultaneous adjustment of the control signal period and one amplifier capacitor. The analyzed tuning methods were validated by extensive simulations of case studies, which were designed following the power specifications of the Qi standard. In 100% and 96% of the case studies, zero voltage switching (ZVS) and zero-derivative voltage switching (ZDS) were achieved, respectively. Furthermore, we identified an unexpected behavior in the tuning process (referred to in this paper as the turning point), which consisted of a change of the expected trend of the soft-switching (i.e., ZVS and ZDS) point, and it occurred in 21% of the case studies. When this behavior occurred and converged to at least ZVS, the tuning process required more iterations and a large number of tuning variables. Additionally, after the tuning process, the total harmonic distortion and output power capacity were improved (i.e., in 78% and 61% of the case studies, respectively), whereas the output power, drain and added power efficiencies deteriorated (i.e., in 83%, 61% and 65% of the case studies, respectively) in the overall case studies. However, we could not identify an improvement in the overall FoMs related to the soft-switching tuning. Furthermore, the tuning impact was significant and produced some improvements and some deleterious effects for the FoMs in each case study, without a clear trend by FoMs or by tuning method. Therefore, the amplifier designer may choose the more favorable tuning method and the related FoM trade-offs for the required design specifications.

scholarly journals Tuning of Nacelle Feedback Gains for Floating Wind Turbine Controllers Using a Two-DOF Model

2020 ◽  
Author(s):  
Eben Lenfest ◽  
Andrew J. Goupee ◽  
Alan Wright ◽  
Nikhar Abbas
Keyword(s):  
Production Performance ◽  
Offshore Wind ◽  
Feedback Gain ◽  
Tuning Method ◽  
Floating Offshore Wind Turbines ◽  
Integral Controller ◽  
Proportional Integral Controller ◽  
Angular Displacements ◽  
Tuning Methods ◽  
Tuning Strategy

Abstract Designing a collective blade pitch controller for floating offshore wind turbines (FOWTs) poses unique challenges due to the interaction of the controller with the dynamics of the platform. The controller must also handle the competing objectives of power production performance and fatigue load management. Existing solutions either detune the controller with the result of slowed response, make use of complicated tuning methods, or incorporate a nacelle velocity feedback gain. With the goal of developing a simple control tuning method for the general FOWT researcher that is easily extensible to a wide array of turbine and hull configurations, this last idea is built upon by proposing a simple tuning strategy for the feedback gain. This strategy uses a two degree-of-freedom (DoF) turbine model that considers tower-top fore-aft and rotor angular displacements. For evaluation, the nacelle velocity term is added to an existing gain scheduled proportional-integral controller as a proportional gain. The modified controller is then compared to baseline land-based and detuned controllers on an example system for several load cases. First-pass results are favorable, demonstrating how researchers can use the proposed tuning method to efficiently schedule gains for adequate controller performance as they investigate new FOWT configurations.

Integrated Control/Display Unit vs. Dedicated Control Heads for Radio Tuning in a KC-135 Flight Simulator

1981 ◽  
Vol 25 (1) ◽  
pp. 258-262
Author(s):  
Debra A. Warner ◽  
David R. Gunning
Keyword(s):  
Integrated Control ◽  
Flight Simulator ◽  
Pilot Performance ◽  
Tuning Method ◽  
Display Unit ◽  
Subjective Opinion ◽  
Tuning Methods

A two-part study was conducted in a KC-135 flight simulator to determine the appropriateness of replacing dedicated control heads with an integrated control/display unit (CDU) for accomplishing cockpit communication (UHF, HF) and navigation (VOR) radio tuning. The CDU is being evaluated as a means of decreasing pilot workload to potentially enable a proposed reduction in KC-135 crew size. During both individual tuning tasks and simulated missions, time and error data were collected comparing pilot performance for the two tuning methods. Although subjective opinion favored the CDU concept, objective results indicated that the conventional tuning method (except HF) was faster. Various features of the CDU plus relative subject inexperience using the CDU were probable contributers to these unexpected results. Subsequent reevaluation is scheduled to occur incorporating changes which are designed to enhance CDU operability.

Optimization Method of Controller Parameter Tuning Based Immune Principle for Complicated System

2014 ◽  
Vol 933 ◽  
pp. 348-353
Author(s):  
Xian Kun Tan ◽  
Lei Li
Keyword(s):  
Parameter Tuning ◽  
Optimization Method ◽  
Tuning Parameter ◽  
Minimum Phase ◽  
Order Process ◽  
High Order Process ◽  
Tuning Method ◽  
Complicated System ◽  
Tuning Methods ◽  
Phase Process

In order to solve the puzzle of parameter tuning of the controller in complicated system, the paper proposed a model of parameter tuning based on immune principle. Firstly it defined the antibody, antigen and affinity in tuning parameter needed, secondly explored the process of parameter tuning based on immune principle in detail, thirdly discussed the tuning method by means of optimizing parameter of the controller. And finally it took the control of high-order process as an example, and made the simulation to a highly non-minimum phase process. The simulation result shows that the proposed method is better in control quality and more effective compared with other tuning methods.

Optimal PI Controller Tuning Based on ITAE Criterion for Low-Order Systems with Large Time Delay

2013 ◽  
Vol 411-414 ◽  
pp. 1716-1719
Author(s):  
Feng Ping Pan ◽  
Hong Kai Liao ◽  
Jia Luo ◽  
Xi Zhang
Keyword(s):  
Genetic Algorithm ◽  
Time Delay ◽  
Large Time ◽  
Pi Controller ◽  
Stable Region ◽  
Controller Tuning ◽  
Nonlinear Fitting ◽  
Tuning Method ◽  
Tuning Methods ◽  
Low Order

For low order process with large time delay, a kind of optimal PI controller tuning method is proposed based on generalized Hermite-Biehler theorem and Genetic Algorithm. Firstly, the stable region of PI controller is obtained by using the generalized Hermite-Biehler theorem. Then the optimum parameters are selected from this region based on ITAE criterion and genetic algorithm. A tuning formula is obtained by nonlinear fitting of optimization result, which has the capability to cover the variety of normalized time delays up to 100. Simulation of Monte-Carlo stochastic experiment indicates that the proposed method has good performance robustness when parameter uncertainty occurs, compared with other four PI tuning methods.

scholarly journals Vinay Mishra and the Artistry of the Harmonium

2021 ◽  
Vol 8 ◽  
pp. 39-46
Author(s):  
Lahiru Gimhana Komangoda
Keyword(s):  
Instrumental Music ◽  
Musical Training ◽  
Fine Arts ◽  
Vocal Music ◽  
Colonial Era ◽  
Tuning Method ◽  
Equal Temperament ◽  
Hindustani Music ◽  
Tuning Methods ◽  
Music Faculty

Vinay Mishra is an accomplished Indian solo and accompanying harmonium player born and brought up in Benaras and currently residing in Delhi serving as a faculty member of the Department of Music, Faculty of Music and Fine Arts, University of Delhi. The rigorous training of both vocal and instrumental music under veteran Hindustani Music virtuosos, the academic and scholarly scope built up till the degree of PhD in Music, the realizations, and understandings on music must have conspicuously made an impact of his practice and artistry as a harmonium player. Harmonium was originated in the west and adopted by Indian musicians in the colonial era which was brought up to the present day through many artistic, cultural and political controversies, and obstacles. This work focuses on discovering the insights of the harmonium art of Vinay Mishra. Hence, his academic background, musical training, musical career, his playing style as a soloist, general techniques and techniques of accompaniment, sense of machinery, perspectives on raga Taal, and thoroughly the tuning methods were studied in-depth through personal conversations and literature resources where it was observed that modern Hindustani harmonium artists favor a typical natural tuning method over the 12 equal temperaments of the common keyboard instruments. According to him, the stable sound of the harmonium was the reason to be vocal music- friendly in classical and light vocal music accompaniment which was only interrupted by the equal temperament earlier and was later overcome by the artists and harmonium makers. The idea was also raised that apart from gaining the basic command of an instrument, a Hindustani instrumentalist may learn and practice all other aspects of Hindustani music from the teachers of other forms too. Vinay Mishra’s thoughts of machinery, musical forms, compositions, applying Hindustani vocal, and plucking string instrumental ornamentations on the Harmonium were also reviewed.

PID Controller Design for Two Tanks Liquid Level Control System Using Matlab

2015 ◽  
Vol 5 (3) ◽  
pp. 436 ◽  
Author(s):  
Mostafa Abdul Fellani ◽  
Aboubaker M. Gabaj
Keyword(s):  
Pid Controller ◽  
Controller Design ◽  
Liquid Level ◽  
Level Control ◽  
Process Industries ◽  
Tuning Method ◽  
Pid Tuning ◽  
Tank System ◽  
Pid Controller Design ◽  
Tuning Methods

The industrial application of Coupled Tank System (CTS) is widely used especially in chemical process industries. The control of liquid level in tanks and flow between tanks is a problem in the process technologies. The process technologies require liquids to be pumped, stored in tanks, and then pumped to another tank systematically. This paper presents development of Proportional-Integral-Derivative (PID) controller for controlling the desired liquid level of the CTS. Various conventional techniques of PID tuning method will be tested in order to obtain the PID controller parameters. Simulation is conducted within MATLAB environment to verify the performances of the system in terms of Rise Time (Ts), Settling Time (Ts), Steady State Error (SSE) and Overshoot (OS). The trial and error method of tunning will be implemented and all the performance results will be analyzed using MATLAB. It has been demonstrated that performances of CTS can be improved with appropriate technique of PID tuning methods.

Study on Auto-Tuning PID Controller

2014 ◽  
Vol 1037 ◽  
pp. 225-227
Author(s):  
Yin Ping Chen
Keyword(s):  
Pid Control ◽  
Pid Controller ◽  
Control Method ◽  
Industrial Process ◽  
Parameter Tuning ◽  
Relay Feedback ◽  
Tuning Method ◽  
Common Control ◽  
Auto Tuning ◽  
Tuning Methods

PID control is the most common control method used in process control. The PID control parameters tuning methods are develop constantly. At present, in numerous tuning methods, there are mainly two methods applied better in the practical industrial process. One is based on pattern identification (based on rules); the other is based on relay feedback (based on model). They are collectively referred to as intelligent PID parameter tuning method. This paper studies on the PID parameter auto-tuning methods and introduces the results of the latest research on this subject. Finally, the development direction of auto-tuning PID controller was also prospected.

Asymptotic Rejection of Periodic Disturbances With Fixed or Varying Period

2000 ◽  
Vol 123 (3) ◽  
pp. 324-329 ◽  
Author(s):  
Shiang-Hwua Yu ◽  
Jwu-Sheng Hu
Keyword(s):  
Design Method ◽  
Repetitive Control ◽  
Sampling Interval ◽  
Control Law ◽  
Integer Multiple ◽  
Tuning Method ◽  
Periodic Disturbances ◽  
Optimal Delay ◽  
Close Relationship ◽  
Tuning Methods

A constructive derivation of repetitive control is obtained, through attempting to derive a control law for asymptotic rejection of periodic disturbances. This derivation not only reveals a close relationship between iterative operator inversion and repetitive control, but also suggests a unified design method for a learning control algorithm. Also, based on the observation, digital repetitive control can be generalized to reject periodic disturbance whose period is not exactly an integer multiple of the sampling interval. This study introduces a delay filter in the digital repetitive control law, which optimally interpolates the signal between samples, thus effectively reconstructing the signal of the previous period and making the learning process of repetitive control successful. The proposed optimal delay filter can be updated easily according to different signal periods. Thus it is specifically suitable for on-line tuning when the signal period is changing. Compared with the available tuning methods, the proposed tuning method has excellent steady-state performance while maintaining fast transient and system robustness. The simulations on active noise cancellation within a duct confirm the superiority of this tuning method.

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