Edi Kurniawan

A survey on robust Repetitive Control and applications

Tracking and rejecting periodic signals are common tasks in many control applications. A well-known use of Repetitive Control (RC) is to both track a periodic reference signal and reject periodic disturbance. This paper reviews various designs of RC that are classified into basic RC design and robust RC design. The recent applications of RC are also presented in this paper.

A low order discrete-time sliding mode repetitive control system

This paper proposes the design of low order discrete-time sliding mode repetitive control system. The design combines the features of discrete-time low order repetitive control (RC) and sliding mode control (SMC). A low order RC is employed to compensate periodic disturbance by targeting specific frequency component of the disturbance. Discrete-time SMC is used to ensure robustness against parameter variations and also to provide fast transient response. The proposed design also results in a low order controller which requires small number of unit delay, which also improves the transient response. The effectiveness of the design has been verified from the simulation results.

Analysis of FBG weight sensor based on laser diode transitive response

An analysis of Fiber Bragg Grating (FBG) sensor for measuring weight is presented here. In the design, FBG was bonded on the cantilever structure using insulating tape. The cantilever structure was loaded with a measurable object, and the transmitted intensity of laser diode was measured. In this study, we used tunable laser controller set to 1554.194 nm and uniform FBG with a center wavelength of 1554 nm. We also used a power meter to measure the intensity. The change in the transmitted intensity of laser diode was found linear, and it showed a repeatable pattern. The results showed that during the loading and unloading of the cantilever structure, the intensity response was detected almost the same for each load. Hence, the results confirmed that the sensor is free of hysteresis.

Design of decoupled repetitive control for MIMO systems

This paper introduces the design of decoupled repetitive control (RC) for multi-inputs multi-outputs (MIMO) system. The design is started by decoupling the MIMO system into separate single-input single-output (SISO) models. Then, a set of low order and causal RC compensator is designed for each single-input single-output (SISO) model obtained from decou-pling. The compensators that ensure the RC stability condition, are obtained by solving optimization problems. Simulation results are given to demonstrate the effectiveness of the proposed design.

Tracking and robust performance of discrete-time model-based controller

Both tracking and robust performance are important issues in control engineering. Tracking performance represents how precise the actuator can follow the reference, while robust performance shows how far the actuator can function properly when plant uncertainty and disturbance appear. This works assess both tracking and robust performance of two popular control algorithms i.e Sliding Mode Control (SMC) and Repetitive Control (RC). A simulation on dc servo motor is performed to assess the performance of SMC and RC. The transient response, tracking accuracy, and robustness are thoroughly discussed in this paper.

Implementation on 3D surface algorithm for measuring thickness parameter of sensor chip

A large hadron collider is operated by CERN to conduct a large scale and a long term particle physic experiment, namely ALICE. Thousand of sensors are used in the collider sensor system to track the trajectories of the results of particle collisions. 3D surface measurement is proposed to assess the quality of sensors. Some surface characteristics of the sensors are defined based on the quality requirements. The 3D imaging algorithm has been developed to measure the thickness of connection line and edge of surface pads. A 3D scanner based on structure light projection method is used to scan the chip surfaces. The algorithm is tested on sensor models which have size similar with the actual sensor chip. The thickness of the line connection is found to be 0.0069 ± 4.0957 × 10-4 mm whereas the pad edge is 0.0015 ± 13.2570 × 10-4 mm. The results show that the algorithm can provide consistent measurement for both parameters.

Model-based control for tracking and rejection of periodic signals

This paper presents model-based control that can be used to simultaneously track periodic reference signal and reject periodic disturbance. Two control methods named as Dual Repetitive Control (DRC) and Model Reference Repetitive Control (MRRC) are studied. The control methods are designed based on known model of the plant. Another assumption in the design is that the reference/disturbance period is also known. A simulation on Servo motor is carried out to analyze the performance of both DRC and MRRC. Transient response, tracking accuracy, and robustness under period variation are discussed.

Foreword from conference chair

The 2015 International Conference on Computer, Control, Informatics and its Applications (IC3INA 2015) will be held in Bandung, Indonesia on October 5th – 7th, 2015. The conference is an annual event co-organized by Research Center for Informatics, Indonesian Institute of Sciences (LIPI) and IEEE Indonesia section. The previous conference IC3INA 2013 and 2014 were technically co-sponsored by IEEE and successfully held in Jakarta and Bandung. The proceedings of IEEE 2013 and 2014 are now globally indexed by IEEE Xplore Digital Library. IC3INA is intended to gather researchers, scientists, engineers, scholar students and practitioners to report present innovations and developments, and to exchange ideas and progresses in the advanced technologies of computer, control, informatics and its application. The Internet of Things is very important today as it represents the evolution of internet, which takes a great leap in its ability to gather, analyze, and distribute data. Due to the explosive growth of devices that are connected to the internet, the Internet of Things gives a significance impact to many sectors such as: education, communication, business, science, government, and etc.