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Measurement of surface stress-strain distribution inside a grain of carbon steel via optical microscope

Measurement 2025年 255卷

作者： I Dewa Made Oka Dharmawan Jinyi Lee Department of Control Instrumentation and Robot Engineering Graduate School of Chosun University Gwangju 61452 Republic of Korea Interdisciplinary Program in IT-BIO Convergence System Chosun University Gwangju 61452 Republic of Korea Department of Electronic Engineering Chosun University Gwangju 61452 Republic of Korea

The advancement of alloys and steel in engineering highlights the critical need for robust methods to ensure structural integrity. While traditional Non-Destructive Testing and Evaluation (NDT/E) techniques provide valuable insights, they often fail to detect pre-existing stress conditions that contribute to fatigue cracks. Recent approaches have addressed this limitation by analyzing stress and strain at the grain level using advanced measurement systems—often based on diffraction techniques—integrated with Finite Element Method (FEM) and Digital Image Correlation (DIC) platforms. However, the application of these techniques for in-service inspections remains limited by challenges in accessibility, cost, and scalability. To overcome these issues, an integrated 2D surface system combining optical microscopy with DIC and grain-level analysis within the FEM framework is proposed. This method enables efficient visualization of grain-level deformation and stress distribution, thereby providing deeper insights into the microstructural behavior of polycrystalline materials under external loads. The proposed methodology is theoretically outlined and validated through simulations and experimental analyses, demonstrating its potential as a practical solution for in-service inspections. Ultimately, this approach is expected to advance inspection techniques by offering an accessible and scalable tool for monitoring microstructural behavior and identifying potential failure mechanisms through surface analysis.

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Improvement of warning lag time in forward collision warning systems based on multifunctional warnings

Improvement of warning lag time in forward collision warning...

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2012 IEEE International Conference on Vehicular Electronics and Safety, ICVES 2012

作者： Thammakaroon, Peachanika Tangamchit, Poj Department of Control System and Instrumentation Engineering King Mongkut's University of Technology Thonburi Bangkok Thailand

ISBN: (纸本)9781467309929

We present an improvement of forward collision warning (FCW) by adding more layers of warning functionality based on five stages of crash timeline. Generally, FCW operates at stage 3, the critical moment before crash. The added functionality is the location-based warning (LW) which warns the driver when driving toward a dangerous spot with high speed. LW operates at stage 2, an open condition to crash which comes from bad driving habit. We propose the use of warning lag time as a performance indicator, which is appropriate for real driving experiment. The warning lag time is defined as the time period between the issue of warning and the execution of brake by a normal driver. We performed real driving experiments with normal drivers and compare their brake actions with warnings from our system. The system with FCW alone achieved an average time lag of 1.47 sec., while the system with both FCW+LW can warn the driver faster with average time lag of 1.32 sec. The accuracy of both systems was about the same at 79%. © 2012 IEEE.

关键词： Brakes

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Study on Deep Reinforcement Learning for Mobile Robots Flocking control in Certainty Situations 19

Study on Deep Reinforcement Learning for Mobile Robots Flock...

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19th International Conference on Electrical engineering/Electronics, Computer, Telecommunications and Information Technology, ECTI-CON 2022

作者： Kheawkhem, Pontakorn Khuankrue, Issarapong King Mongkut's University of Technology Thonburi Dept. of Control System and Instrumentation Engineering Bangkok Thailand

ISBN: (纸本)9781665485845

Mobile robots are the widely used machines that will be a part of life. It can easily be scaled to meet the requirements of human uses and can move to different target areas freely. However, mobile robots have a problem with mobility, which needs to respond to human activities and obstacles. Reinforcement learning (RT) is a part of machine learning, which enables the machine to learn by themselves. It can develop in a real-world environment without machine teaching or patterns. This paper proposed the study on the flocking control simulation, which avoids the obstacles. Mobile robots in simulation presented by using Multi-Agent Deep Deterministic Policy Gradient (MAD-DPG). The proposed algorithm, the deep reinforcement learning algorithm, is the main navigation of robots, which find the target, maintain distance between robots, and avoid collision with obstacles by learning features and characteristics with certainty environment, obstacle, robots, and target. On the simulation, the authors operate all of the positions in the environment, and robots speed in the environment as the state. © 2022 IEEE.

关键词： Reinforcement learning

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Forecasting the quantity and concentration of flocculant in clarification process for sugarcane industry 18

Forecasting the quantity and concentration of flocculant in ...

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18th International Conference on Electrical engineering/Electronics, Computer, Telecommunications and Information Technology, ECTI-CON 2021

作者： Chantaruk, Singhadid Koolpiruck, Diew Chongstitvatana, Prahhas Chulalongkorn University Computer Engineering Bangkok Thailand King Mongkut's University of Technology Thonburi Control System and Instrumentation Engineering Bangkok Thailand

ISBN: (纸本)9780738111278

The clarification process is an important part of sugarcane production. This process is used for separating sediment and sugarcane juice by adding flocculant. The addition of quantity and concentration of flocculant directly affects the settling rate and turbidity of sugarcane juice. This paper proposes a model for forecasting quantity and concentration of flocculant by using Long Short-Term Memory (LSTM) Neural Network. Input data consists of green cane, burn cane, turbidity, and rainfall. Output data includes quantity and concentration of flocculant. Raw data was collected from top sugarcane factory and meteorological department in Thailand. The results are the forecast of the quantity and concentration of flocculant for one day in advance. The performance of LSTM is compared to the autoregressive integrated moving average (ARIMA), recurrent neural network (RNN), and gated recurrent unit (GRU) using root mean square error and mean absolute percent error. The result indicates that LSTM has the best performance. The forecast helps the operator in clarification process to prepare the flocculant. © 2021 IEEE.

关键词： Forecasting

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Optimization of Electrode Design in Capacitance Liquid Level Sensor 6

Optimization of Electrode Design in Capacitance Liquid Level...

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6th International Conference on Recent Trends on Electronics, Information, Communication and Technology, RTEICT 2021

作者： Hanni, Jayalaxmi Rajesh Santhosh, V.K. Manipal Institute of Technology Manipal Academy of Higher Education Centre for Cyber Physical System Department of Instrumentation and Control Engineering India

ISBN: (纸本)9781665435598

Capacitance Level Sensor (CLS) is used to measure liquid level in many of the process industries. The main objective of the work is to optimize a design of novel helical electrode of CLS, in order to enhance the sensitivity and reduce the time response of sensor. The main effecting parameters of the design are considered to be pitch and radius of inner electrode of CLS. These parameters are directly affected on sensor output and time response. If the pitch is considered to be zero, then the helical sensor acts as a cylindrical CLS exhibiting higher response time and higher capacitance output. And if the pitch is considered to be infinity (66 cm in our case) then helical CLS acts as parallel plate CLS exhibiting lower capacitance output and lower time response. Hence the pitch and radius of inner electrode are optimized using Taguchi optimization method. Results showed that pitch of 2.64 cm and 1.08 cm radius of inner electrode gives maximum capacitance output and lower time response as related to that of existing CLS. © 2021 IEEE.

关键词： Capacitance

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An Intelligent Robot Assisting Medical Practitioners to Aid Potential Covid-19 Patients 6

An Intelligent Robot Assisting Medical Practitioners to Aid ...

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6th International Conference on Image Information Processing, ICIIP 2021

作者： Sowrabh, S. Rameshkumar, Ashith Athira, P.V. Jishnu, T.B. Anish, M.N. UPES MTech in Robotics and Automation School of Engineering Dehradun India NSSCE Bachelor of Technology in Instrumentation Control Engineering Department Palakkad India Assistant System Engineer-trainee TCS Limited Kochi India NSSCE Instrumentation Control Engineering Department Palakkad India

ISBN: (纸本)9781665433617

The purpose of this paper is to develop a robot-nurse capable of assisting human health professionals in a COVID-19 isolation unit such that health care professionals may discontinue wearing the personal protective kit that they previously wore when dealing with patients at isolation units. The robot can perform most of the tasks carried out by human nurses in a hospital. It can take a patient's temperature without touching them, administer medicines at the appropriate time, assist in sanitizing the individual and their hands, and offer a section for sterilizing medical equipment. [14] © 2021 IEEE.

关键词： Nursing

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FIR optimization control for external vibration in self servo track writer

FIR optimization control for external vibration in self serv...

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作者： Thongsuk, Parnupong Panomrattanarug, Benjamas Department of Control System and Instrumentation Engineering King Mongkut's University of Technology Thonburi Bangkok 10140 Thailand

ISBN: (纸本)9784907764364

In hard disk drive manufacturing, the servo tracks are written with the equipment of servo track writer. External vibrations during servo track writing process give rise to servo track writing error. The servo track writing error can cause some critical errors during data writing operation. This paper proposes two control schemes using an effective Finite Impulse Response (FIR) compensator to attenuate external vibrations based on optimization technique. The former aims to decrease the error in each frequency by minimizing the sensitivity transfer function from command/disturbance to error. It is constructed in a feedback control loop without any sensor to detect vibrations. The latter is also designed in the frequency domain with a slightly different objective function. Here the designed compensator is constructed in a feedforward scheme with a use of accelerometer to measure vibrations. Without a mathematical model of the system, the FIR compensator from the two structures can be practically designed by using the experimental data of the system. The more number of gains used in the compensator design, the better the performance. Weighting functions are applied to emphasize on the addressed frequencies where the vibrations usually dominate. © 2010 SICE.

关键词： Errors

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Analysis of stiction fault in pneumatic control valves 16th

Analysis of stiction fault in pneumatic control valves

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16th control instrumentation system Conference, CISCON 2019

作者： Navada, Bhagya R. Santhosh, K.V. Department of Instrumentation and Control Engineering Centre for Cyber Physical System Manipal Institute of Technology Manipal Academy of Higher Education Manipal576104 India

ISBN: (纸本)9789811546754

To cater to the ever-increasing needs of customers, industries have to give more importance toward maintenance of health of industrial process equipments through better monitoring system. Thus, fault detection and diagnosis techniques have a vital role in maintaining industrial process health. Stiction is one of the commonly occurring control valve faults in most of the flow process industries. In this paper, an attempt is made to synthesis the Choudhury’s stiction model to analyze the behavior of the control valve with stiction fault. Behavior of control valve is analyzed under different stages like linear, deadband, undershoot, overshoot and no offset conditions. © Springer Nature Singapore Pte Ltd. 2020.

关键词： Fault detection

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Modeling Dynamic Frequency control with Power Reserve Limitations 53

Modeling Dynamic Frequency Control with Power Reserve Limita...

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53rd International Universities Power engineering Conference, UPEC 2018

作者： Minh Trang, Le Thi Nouri, Hassan Department of Instrumentation and Control Engineering Czech Technical University in Prague Prague Czech Republic Power System Electronics and Control Research Laboratory University of West of England Bristol United Kingdom

ISBN: (纸本)9781538629109

The frequency variation of a power system depends on the relationship between power generation and consumption. Increase in loads, losses or inclusion of renewable energies will lead to inaccurate controllability of the network frequency, which is the result of consumption-generation imbalance. If this imbalance is high, damage and degradation of network performance, as well as trips of loads and generators is inevitable. In modern grids attention is given to the amount of power supplied to satisfy the loads and system losses and also for reserve services. The latter provides security and stability of the *** control is usually provided by generating units to regulate the generated power. In modern networks such as smart grids, the power reserve concepts are used via three different technologies, namely: Frequency Containment Reserves (FCR), Frequency Restoration Reserves (FRR) and Replacement Reserves (RR). In some countries such as Denmark and Norway, it is compulsory for FCR to be implemented in the network. The FCR is operating the reserves necessary for constant containment of frequency deviations from nominal value in order to constantly maintain the power balance in the whole synchronously interconnected system. Compared with traditional reserves, the FCR can deliver the same service plus the additional benefit of faster response speed in *** paper proposes a dynamic simulation model of an interconnected network to identify frequency responses based on current practice in power systems frequency control. The dynamic frequency response identification method is deployed in two steps: the first step is the representation of the dynamic models of the power system through the power equilibrium equation and in the second step, modelling the frequency control system in response to the frequency variations, which consider FCR technology. Simulations are carried out in MATLAB/SIMULINK and the simulation studies of the frequency responses confirm

关键词： MATLAB

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A Light Source system of Multi-star Simulator with Adjustable Background and controllable Magnitude

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空间科学学报 2017年第6期37卷 760-765页

作者： SUN Gaofei LIU Shi ZHANG Guoyu ZHANG Yu LEI Jie MA Yiyuan College of Optoelectronic Engineering Changchun University of Science and Technology Changchun 130022 Optical Measurement and Control Instrumentation Jilin Province Engineering Research Center Changchun 130022 Key Laboratory of Space System Simulation Beijing 100853

A light source of multi-star simulator capable of background adjustment and magnitude control has been *** integrating spheres are employed as the star-point light source and the background light source respectively.A beam splitter prism has been designed to serve as the beam combiner for the star-point and the background light sources,and a mathematical model has been constructed respectively to compute the light flux of the two integrating spheres.A magnitude testing system and a background testing system have been created using low-light illuminometer,luminance meter,and testing instruments to measure the star-point magnitude and the background luminance of the multi-star *** test results suggest that the star-point magnitude is adjustable from0 to+5 m_v,with a simulation precision superior to ±0.026 m_*** maximum background luminance is 3.8×10~5 cd·m^(-2),and the minimum background luminance is6.4×10^(-2)cd·m^(-2).The designed light source system can meet the requirements for simulating the stellar map with a sky background.

关键词： Adjustable background controllable magnitude Multi-Star simulator Light source

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