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International Conference on Electrical, Communication, and Computer engineering (ICECCE)

作者： Tri Duc Tran Xuan Quang Ngo Van Tu Duong Huy Hung Nguyen Tan Tien Nguyen National Key Laboratory of Digital Control and System Engineering (DCSELab) Ho Chi Minh City University of Technology (HCMUT) Ho Chi Minh City Vietnam Faculty of Electronics and Telecommunication Saigon University Ho Chi Minh Viet Nam National Key Laboratory of Digital Control and System Engineering (DCSELab) Ho Chi Minh City University of Technology (HCMUT) Ho Chi Minh Viet Nam

Fire extinguisher testing is an important process to evaluate its quality prior to commercial use. Traditionally, human operators execute the testing process. However, long-term exposure to high temperatures might affect the physical health of the operators. Additionally, the light intensity of the heat source prevents the operators from getting close, which significantly reduces the testing efficiency. Therefore, automating fire extinguisher testing poses the demand for a dedicated mobile robot where the localization enabling path planning control exhibits the challenges. In this paper, we propose a novel kinematic model of a dedicated mobile robot using the three-Pixy2 sensor for tracking the predetermined path in automating the fire extinguisher testing process. These sensors are designed to detect the central point of a dark area that is distinct from the light background. The kinematic model is essential to employ the Extended Kalman Filter (EKF) to reduce the noisy data from the Pixy2 sensors. Consequently, the filtered data is then fed to the estimation algorithm to provide the position of the mobile robot. Finally, experiments were carried out to evaluate the effectiveness of the proposed model and estimation algorithm. The result proves that the EKF can smoothen the estimated position.

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Design and Calibration of Multi-Channel Thermocouple Signal Converter

Design and Calibration of Multi-Channel Thermocouple Signal ...

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International Symposium on Electrical and Electronics engineering (ISEE)

作者： Quoc Bao Nguyen Hai Dang Ho Duc Tai Nguyen Van Tu Duong Huy Hung Nguyen Tan Tien Nguyen National Key Laboratory of Digital Control and System Engineering (DCSELab) Ho Chi Minh City University of Technology (HCMUT) Ho Chi Minh City Vietnam Vietnam National University Ho Chi Minh City Ho Chi Minh City Vietnam National Key Laboratory of Digital Control and System Engineering (DCSELab) Faculty of Mechanical Engineering Ho Chi Minh City University of Technology (HCMUT) Ho Chi Minh City Vietnam Faculty of Electronics and Telecommunication Saigon University Ho Chi Minh City VietNam

Thermocouples are widely used as sensors for measuring temperature due to their high sensitivity and wide range, but they require an interface with Analog-to-digital Converters. (ADCs). This article presents a design approach for a multi-channel thermocouple converter, enhancing accuracy, performance, and flexibility, while also examining the impact of heat rise rate on temperature values.

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Recursive Least Squares Algorithm for Online Parameter Identification of DC Motor: Theory and Practice

Recursive Least Squares Algorithm for Online Parameter Ident...

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International Conference on engineering and Emerging Technologies (ICEET)

作者： Nhut Thang Le Minh Tri Nguyen Cong Toai Truong Van Tu Duong Huy Hung Nguyen Key Laboratory of Digital Control and System Engineering (DCSELab) Faculty of Mechanical Engineering Ho Chi Minh City University of Technology (HCMUT) Ho Chi Minh City Vietnam Vietnam National University Ho Chi Minh City Ho Chi Minh City Vietnam Faculty of Electronics and Telecommunication Saigon University Ho Chi Minh City Vietnam

ISBN: (数字)9798331532895

ISBN: (纸本)9798331532901

In the automation era, DC motors are widely utilized across various industries due to their adaptability and efficiency. In the downside of reality, accurately modelling and controlling their behavior under diverse operational conditions remains challenging. Hence, this study proposes a comprehensive approach integrating Recursive Least Squares (RLS) for parameter estimation within ARX models, combined with experiment data to enhance model accuracy. Moreover, State Feedback control is applied to optimize DC motor operation. Specifically, the model coefficients are predicted over time, alongside recording the error between the actual output and predicted output within a 30 -second timeframe. The results indicate that the error is controlled and converges to 0 within 0.5-second (approximately 10 cycles). As a result, in the online model updates, system error increases and deviates from zero over time due to model drift, likely caused by environmental factors or changes in the motor's temperature. In contrast, the error remains stabilized around zero with online model updates, demonstrating improved control effectiveness through continuous model adaptation.

关键词： Adaptation models State feedback Solid modeling Parameter estimation Temperature Wheels Predictive models DC motors Solids Data models

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Adaptive Sliding Mode control for a Blower-Based Breathing Simulator with Unknown and Time-Varying Airway Resistance and Compliance

Adaptive Sliding Mode Control for a Blower-Based Breathing S...

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International Conference on engineering and Emerging Technologies (ICEET)

作者： Trung Dat Phan Ly Xuan Truong Pham Cong Toai Truong Van Tu Duong Huy Hung Nguyen Key Laboratory of Digital Control and System Engineering (DCSELab) Faculty of Mechanical Engineering Ho Chi Minh City University of Technology (HCMUT) Ho Chi Minh City Vietnam Vietnam National University Ho Chi Minh City Ho Chi Minh City Vietnam Faculty of Electronics and Telecommunication Saigon University Ho Chi Minh City Vietnam

ISBN: (数字)9798331532895

ISBN: (纸本)9798331532901

Looking back at history, the world has experienced many pandemics that affect the people experiencing respiratory system, and most recently, the severe devastation of the COVID-19 pandemic. This reflects the reality of life and the global disparity in ventilator availability between high-income countries and low and middle-income countries. Additionally, various simple ventilators and breathing simulators are non-functional with various artificial lungs due to dynamic lung parameter changes during operation. Therefore, this paper proposes an adaptive controller for a novel blower-based breathing simulator to address the challenge of unknown and varying artificial lung parameters. Specifically, an adaptive sliding mode controller has been developed for precise volume control under uncertain conditions. Alongside that, the metric Integral of Absolute Error (IAE) is used to evaluate control performance. The first simulation scenario with three different input signals, which comprise a ramp, parabolic, and sinusoidal, remained permissible errors below 5%. In the other scenario, the blower-based breathing simulator model's control performance with two different airway parameters sets IAE values over 12 cycles. In the 6 initial cycles, the trend of IAE values shows a gradual decrease over cycles. At cycle 7, a change in airway parameters causes a difference in the IAE value, but it quickly decreases in the following cycles. As indicated by this outcome, the proposed controller proves not only efficient when the airway parameters are unknown constants but also adaptable when these parameters change over time.

关键词： Resistance Measurement Ventilators Pandemics Lungs Simulation Pulmonary diseases Market research History Sliding mode control

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Modeling and control of Testing Machine for Fire Sprinkler K - Factor Evaluation

Modeling and Control of Testing Machine for Fire Sprinkler K...

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International Conference on control, Automation and Information Sciences (ICCAIS)

作者： Hai Dang Ho Huu Nhan Nguyen Cong Toai Truong Van Tu Duong Huy Hung Nguyen National Key Laboratory of Digital Control and System Engineering (DCSELab) Faculty of Mechanical Engineering Ho Chi Minh City University of Technology (HCMUT) Ho Chi Minh City Vietnam Vietnam National University Ho Chi Minh City Linh Trung Ward Thu Duc City Ho Chi Minh City Vietnam Faculty of Electronics and Telecommunication Saigon University Ho Chi Minh City Vietnam

ISBN: (数字)9798331542047

ISBN: (纸本)9798331542054

During the period of demographic transition, when the demand for accommodation increases, the role of the fire protection system becomes more important than ever. Among these, the most popular fire protection component is the fire sprinkler. To ensure the safety requirements, this paper introduces the evaluation $K$ -factor machine (EKFM) to test fire sprinklers according to the ISO 6182–1: 2004 standard. Overall, the EKFM comprises a water pump whose speed is adjusted by a variable frequency drive (VFD) to control pipeline flow and sensor system, including flow and pressure sensor to provide feedback on the value measure. Additionally, according to the ISO 6182–1: 2004 standard, the operation of the EKFM needs to create an initial pressure of 0.5 bar in the pipeline, increase by 1 bar per pressure set point until reaching 6. 5 bar, and then decrease back to 0.5 bar. Based on the properties of EKFM, the paper proposes model identification of the EKFM and designs the P controller to ensure the steady-state error is within 5 % of the setpoint for each pressure step. Specifically, the EKFM is modeled identification using a data-driven approach, comprising group one data for identification and another for validation. Besides, simulation scenarios are conducted following the ISO 6182–1: 2004 standard test procedure to find the suitable value for proportional (P) control and compare the simulation result with controller evaluation criteria. Furthermore, experimental data indicate that the EKFM can maintain an error of within 5 % error for pressures less than 3 bar and 2 % for pressures greater than 3 bar. As a result, the EKFM can evaluate the quality of the fire sprinkler before it is applied in the market.

关键词： ISO Standards Simulation Pipelines Variable speed drives Water pumps Steady-state Protection Standards Bars Testing

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Electromagnetic Force Measurement Apparatus for Electrical Coil Investigation

Electromagnetic Force Measurement Apparatus for Electrical C...

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International Conference on control, Automation and Information Sciences (ICCAIS)

作者： Quoc Minh Lam Anh Duy Hoang Ngoc Cong Toai Truong Van Tu Duong Huy Hung Nguyen Tan Tien Nguyen Faculty of Mechanical Engineering National Key Laboratory of Digital Control and System Engineering (DCSELab) Ho Chi Minh City University of Technology (HCMUT) 268 Ly Thuong Kiet Street District 10 Ho Chi Minh City Vietnam Vietnam National University Ho Chi Minh City Linh Trung Ward Thu Duc City Ho Chi Minh City Vietnam Faculty of Electronics and Telecommunication Saigon University Ho Chi Minh City Vietnam

Typically, an electromagnet can be used as an electrical actuator to provide contactless forces, it is crucial to identify and govern the characteristics that impact the attraction force between the electromagnet and the target object in order to ensure precision in contactless force control. This research undertakes the development of an electromagnetic force measurement apparatus (EFMA) to investigate the factors affecting electromagnets actively. The paper assesses the influence of both distance and current on the electromagnet attraction force. Several experimental tests were put in place to determine the accuracy of the model and successfully draw conclusions about the relationship between parameters.

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Slip Resistance Test Apparatus of Synthetic Rubber Trackpad on Photovoltaic Surface

Slip Resistance Test Apparatus of Synthetic Rubber Trackpad ...

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International Conference on Ubiquitous Robots (UR)

作者： Anh Duy Hoang Ngoc Cong Toai Truong Minh Tri Nguyen An Nguyen Danh Van Tu Duong Huy Hung Nguyen Tan Tien Nguyen National Key Laboratory of Digital Control and System Engineering (DCSELab) Ho Chi Minh City University of Technology (HCMUT) Ho Chi Minh City Viet Nam Faculty of Mechanical Engineering Ho Chi Minh City University of Technology (HCMUT) Ho Chi Minh City Viet Nam Viet Nam National University Ho Chi Minh City Ho Chi Minh City Viet Nam Faculty of Electronics and Telecommunication Saigon University HCM VN

The increasing development of the solar energy industry in many countries has led to a rising frequency of human and robot presence in this area. To ensure occupational safety, various protective equipment, including rubber material, is commonly used for slip resistance while moving on the surface of solar PV panels. Therefore, the slip resistance test apparatus is built for testing the slip resistance between the synthetic rubber trackpad and the photovoltaic panel (PV) surface. Synthetic rubber is a man-made material, so it is difficult to control the parameters of the mechanical and chemical properties absolutely. Variations in wet/dry working conditions or Shore hardness are factors that make slip computation more challenging. Therefore, an apparatus with the principle of converting the reciprocating motion of the screw and the casters into the rotation of the hinge is introduced to adjust the tilt angle of the upper surface, detect and evaluate the slippage of the rubber trackpad by sensors. Some parameters related to accuracy such as vibration and theoretical-empirical assessment, are also mentioned. In addition to designing a reliable apparatus, the article also succeeded in providing a safety standard for synthetic rubber with Shore A30-A40 when moving on PV surfaces.

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Adaptive Sliding Mode control for Tracked Mobile Robot Under Slip Condition

Adaptive Sliding Mode Control for Tracked Mobile Robot Under...

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International Conference on control, Automation and Information Sciences (ICCAIS)

作者： Xuan Quang Ngo Tri Duc Tran Huy Hung Nguyen Van Tu Duong Hoang Long Phan Tan Tien Nguyen National Key Laboratory of Digital Control and System Engineering (DCSELab) Faculty of Mechanical Engineering Ho Chi Minh City University of Technology (HCMUT) 268 Ly Thuong Kiet Street District 10 Ho Chi Minh City Vietnam Vietnam National University Ho Chi Minh City Linh Trung Ward Thu Duc City Ho Chi Minh City Vietnam Faculty of Electronics and Telecommunication Saigon University Ho Chi Minh Vietnam

Tracked mobile robots have played an essential role in transportation, especially in off-road conditions. The behavior of tracked mobile robots in outdoor off-road conditions is quite different from those working in structured indoor environments. It requires consideration of many challenging issues such as slip and sinkage phenomena. The slipping parameters, which generate a large accumulating positioning error in vehicles, are usually unknown and change suddenly during operating through different terrains or moving from linear lines to curved lines. Therefore, these unknown parameters should be estimated, and the control system of the tracked mobile robot still achieves good tracking performance and robustness, irrespective of how abruptly the slipping parameters vary. This paper proposes the slip parameter adaptive sliding mode controller as the low-level controller for the tracked mobile robot to track a desired trajectory. The adaptive control scheme allows the tracked mobile robot to be controlled accurately without the knowledge of slipping parameters. A simulation is conducted to validate the efficiency of the proposed controller.

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Model Identification of Two Double-Acting Pistons Pump: A NARX Network Approach

Model Identification of Two Double-Acting Pistons Pump: A NA...

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International Conference on Ubiquitous Robots (UR)

作者： Cong Toai Truong Khoa Nguyen Danh Van Tu Duong Thang Dinh Van Dae Hwan Kim Van Nguyendong Huy Hung Nguyen Tan Tien Nguyen National Key Laboratory of Digital Control and System Engineering (DCSELab) Ho Chi Minh City University of Technology (HCMUT) Ho Chi Minh City Viet Nam Faculty of Mechanical Engineering Ho Chi Minh University of Technology (HCMUT) Ho Chi Minh City Viet Nam Viet Nam National University Ho Chi Minh City Ho Chi Minh Viet Nam Pukyong National University Korean Faculty of Electronics and Telecommunication Saigon University HCM VN

The demand for utilizing medical ventilators for inter and intrahospital transport has risen quickly in recent periods of human society due to the consequences of the Covid-19 pandemic. Patients who have suffered during this pandemic need different modes of ventilation as a vital cure for their injured lungs. The development of control modes for medical ventilators requires a mathematical model which is able to represent the behavior of an air compressor accurately. In this paper, a parametric black-box method is used to obtain such a mathematical model, that is Nonlinear AutoRegressive with eXogenous input (NARX) model. This NARX model is constructed by experimental data from the air compressor using the bump-based two double-acting pistons (DAPP). The term selection and parameter estimation process are presented and conducted based on measured data. The identification model is also validated based on statistic criteria in the aspect of one-step-ahead prediction (OSA). The results show great tracking performances of identified NARX model.

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Structural Design of Mos2-Cu Films to Improve Thermal and Tribological Properties of Silicon Nitride Materials

SSRN

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SSRN 2024年

作者： Zhang, Xiaochen Liang, Jiaqi Bai, Xu Wang, Xiaolong Wu, Yuhou Zhang, Ke Zheng, Tongxiang Zhao, Zichen School of mechanical engineering Shenyang Jianzhu University No. 25 Hunnan Middle Road Hunnan District Shenyang110168 China Key Laboratory of Vibration and Control of Aero-Propulsion System Ministry of Education Northeastern University Shenyang110819 China Key Laboratory of Fundamental Science for National Defense of Aeronautical Digital Manufacturing Process of Shenyang Aerospace University Shenyang110135 China School of Mechanical Engineering Shenyang University of Technology No.111 Shenliao West Road Economic & Technological Development Zone Shenyang110870 China National-Local Joint Engineering Laboratory of NC Machining Equipment and Technology of High-Grade Stone Shenyang110168 China

In order to solve the problems of heat dissipation and insufficient wear resistance of silicon nitride materials during dry friction, a novel Ti/TiN/MoS2-Cu lubricated film was deposited on a silicon nitride substrate by magnetron sputtering. The results show that the Ti/TiN structure design promoted MoS2(002) crystal plane growth. Moderate Cu(20W) doping promoted film densification and reduced structural defects, resulting in films with high thermal conductivity and low wear rate. Excessive Cu(40W) doping enabled the films to have high hardness, but due to structural defects and elemental aggregation, the thermal conductivity and abrasion resistance of the films were reduced. The Ti/TiN structure and MoS2-Cu film design provide guidance to improve the thermal and tribological performance of silicon nitride materials. © 2024, The Authors. All rights reserved.

关键词： Friction

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