Nundrakwang, Songmoung

Preferred name

Alternative Name

Nundrakwang, S.

Main Affiliation

School of Engineering

songmoung.nu@kmitl.ac.th

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Comparative study of QCM analyzers based on pierce oscillator and electromechanical impedance techniques
(2017-02-21)
Jayasvasti, Subhawat
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Isarakorn, Don
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Nundrakwang, Songmoung
This paper presents a comparison between pierce oscillator and impedance analysis techniques for measuring the frequency of the quartz crystal. The QCM analyzer based on pierce oscillator is designed, realized, and then compared to the impedance analyzer (Type bode 100). The comparison is focused on accuracy and precision of measurement. The pierce oscillator in a completed-chip is employed in the QCM analyzing device in order to simplify the circuit of system. The frequency drift and standard deviation (SD) values which are obtained from resonant frequency measurement are studied in order to investigate the accurate and precise measurement of devices. In the experiment, an AT-cut quartz disc of crystal oscillator package HC49U is unloaded and loaded while it is being measured the frequency. From the experimental results, the QCM analyzer based on pierce oscillator and impedance analyzer have the approximate accuracy and precision of measurement. The QCM analyzer based on pierce oscillator has lower sensitivity due to the frequency drift.
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A Comparative Study of the Electrical Characteristics of Piezoelectric and Triboelectric Nanogenerators for Energy-Harvesting Floor Tiles
(2020-06-01)
Yingyong, Phonexai
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Thainiramit, Panu
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Nundrakwang, Songmoung
;
Janphuang, Pattanaphong
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Isarakorn, Don
Piezoelectric and Triboelectric nanogenerators (PENG and TENG) have gained significant attention for use in self-powered electronics and sensing systems. They also have high potential to harvest energy from low-frequency vibration sources in the ambient environment. This paper investigated the performance and behavior of the two aforementioned nanogenerators based on energy-harvesting floor tiles by using a test bench to demonstrate the electrical characteristics output and comparing their power density output, energy density output, and other properties for characterization and scale-up in practical applications. The input used in the experiment varied the gap distance of the cover plate for the test bench with constant pneumatic pressure to excite the cover plate. The experimental results showed that the power density and energy density of PENG were higher than those of the TENG. The power density and energy density measured in 10 s under 2 Hz of input excitation of PENG and TENG at the gap width of 5 mm were 5773.35 μW/cm3, 1376.26 μJ/cm3 and 752.34 μW/cm3, 31.32 μJ/cm3, respectively. Due to their high output density, they enable promising possibilities to power small consumption electronics and sensing systems.
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Piezoelectric energy harvesting from machine vibrations for wireless sensor system
(2015-08-17)
Panthongsy, Phosy
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Isarakorn, Don
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Sudhawiyangkul, Thapanun
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Nundrakwang, Songmoung
In recent years, wireless sensor network is used in a variety of applications and highly required. These wireless sensor network is powered by the battery with limit energy. Therefore, the integration of energy harvester and wireless sensor network has received more attention because it can prolong the lifetime of battery in a sensor node. The focus of this paper is to design the energy harvesting device from machine vibrations for wireless sensor node, which the amplitude and frequency of vibration source were contributed on the design. The structure of energy harvesting devices is a resonant type piezoelectric energy harvester with a proof mass at the tip of the beam for tuning its resonant frequency. The proposed piezoelectric energy harvesters were then designed and analyzed by using Finite Element Method (FEM) to optimize the natural frequency of the harvester. Then, the prototype energy harvesters were made and mounted to a vibration source for experiments. The result reveals that the optimal piezoelectric energy harvester can generate the output power of 82.29 μW at the resonant frequency of 50 Hz.
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Proposal of the concept of a breathing assist system for saxophone players with breathing problems
(2019-07-01)
Kato, Tomonori
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Shimazaki, Kohei
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Nundrakwang, Songmoung
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Chuprasert, Pavarit
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Thumwarin, Pitak
This research aims to propose the concept of a breathing assist system for saxophone players with breathing problems. First, the quantity of pressure and air flow rate required to play an alto saxophone is determined by certain investigations and experiments. Second, the above-mentioned concept, which works like a pneumatic master-slave amplifier, is proposed and the details of each component are explained.
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Resonance in vocal techniques analysis
(2018-08-13)
Kittimathaveenan, Kajornsak
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Thumwarin, Pitak
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Pakalong, Nattaporn
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Nundrakwang, Songmoung
Singers, especially when they start training, tend to have many questions concerning how to control their body as a musical instrument in order to create the sound they want. The fact that we humans can speak since birth does not mean that everyone can also control their vocal tract to make satisfactory singing sounds. Indeed, some people do not fully understand which organs are involved in the production of human speaking and singing sounds. To effectively teach singers, it is necessary to encourage them to observe the relationship between the voice organ and the sound they hear. This helps them understand which organs produce their singing voice as opposed to everyday speaking sounds. In this study, signal processing principles were used to analyze singing voices with the aim of helping singers and teachers to easily understand the principles of voice production, and with a focus on the effect of singing with nasal resonance. To fulfill this study, singing sounds were recorded and then processed to display the sound spectrum (amplitude of sound at different frequencies). In addition, the relationship between the voice production and the associated sounds were graphically analyzed.
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Internet based crossover robot remote control competition among Asian countries - Development of practice based innovative education methodology, Phase V
(2012-10-23)
Xu, C.
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Ming, A.
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Kanamori, C.
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Aoyama, H.
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Li, H.
We introduce 2011's progress and achievements of an internet based crossover robot remote control competition between Japan and China, Thailand, and Taiwan respectively. The competition project has two subjects: the competition itself and the student-student communication and cooperation. The basic competition mode is a remotely controlled robot via the internet cooperates with a locally controlled robot to finish a specified task and, as a unique feature of the project, the studentstudent communication and cooperation is trained through a crossover team organization style that each team is organized by two groups from different universities and the team members required to cooperate with each other via the internet to make robots and deal with competition affairs. Our experience shows the competition benefits not only students' technical skills but also their various no-technical skills and is expected to promote the development of a practice based university education methodology in the future. © 2012 IEEE.
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Internet based crossover robot remote control competition among Asian countries: Development of practice based innovative education methodology, phase III
(2010-11-29)
Xu, C.
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Ming, A.
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Kanamori, C.
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Aoyama, H.
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Li, H.
We report the 3<sup>rd</sup> year's progress of an internet based crossover robot remote control competition which is an international cooperative educational project among Japan, China, Thailand, and Taiwan. In 2009 we proposed a new competition model called "Cargo loading via internet based cooperation" in which a locally controlled humanoid robot and a wheeled mobile robot under remote control cooperate with each other to search for and find some cargos, then load them on the mobile robot or put them into a cargo box. The unique of the project is that everything concerned with the competition, e.g. the competition rules, the detailed technical problems, etc., are discussed and solved by students themselves from different partner universities via the internet based cooperation. The demonstration of the proposed competition between UEC and partner universities proves the project helps to improve students' practical ability, creative thinking, good teamwork spirit, and communication skills in English, etc. © 2010 IEEE.
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Practical Test of Contactless Rotational Piezoelectric Generator for Low Speed Application
(2019-05-15)
Sriyuttakrai, S.
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Isarakorn, D.
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Boonprasert, S.
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Nundrakwang, S.
Piezoelectric has drawn significant attention as the smart and straightforward generator as energy harvester for decades. The principle of this theology is to transform the vibration from itself blending become electricity through the piezoelectric effect phenomenal. Piezoelectric has been used to generate electricity through the cantilever form. However, it still hard to apply with the rotational movement. This research represents the practical optimization test of the rotational piezoelectric generator for a low-speed application such as application in ocean wave or wearable device under the speed between 10 to 100 RPM. The design was applied a pushing force of two permanent magnets which, attached at the far end of the piezoelectric cantilever in stator and the rotational disk in rotor. When the application load drives the rotor, the magnetic field from each permanent magnet will repulse each other and generate AC electricity. The experimental result shows the possibility to harvest energy in the range of 5.92 and 234.47 microwatts at 10 RPM (0.167 Hz) and 100 RPM (1.667 Hz) in order.
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Energy harvesting for self-powered systems
(2020-07-01)
Nundrakwang, Songmoung
;
Yingyong, Phonexai
;
Isarakorn, Don
Harvesting energy from waste energy sources in ambient environmental is the accessible technology in the field of self-power electronic devices for high-efficiency energy due to the power consumption of modern electronic devices that are rapidly developed to microwatt, low-cost, lightweight, and small size. Since numerous research are investigated the technique for converting the ambient energy into useable electrical energy for practical application. Including light, thermal gradients, vibration or motion, and radio-frequency electromagnetic radiation, various forms of waste energy sources are proposed in this review. Their existing power density in the ambient environment is demonstrated. Moreover, the fundamental theory and the application of the energy harvesting devices are discussed as a foundation of the energy conversion technology for self-power electronic devices such as handheld, wearable, and portable devices.
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Internet based crossover robot remote control competition among Asian countries - Development of practice based innovative education methodology, phase IV
(2011-11-17)
Xu, C.
;
Ming, A.
;
Kanamori, C.
;
Aoyama, H.
;
Li, H.
We report the up-to-date progress of an internet based crossover robot remote control competition project starting from 2007, which is an international cooperative education program among Japan, China, Thailand, and Taiwan. The project contains two sub-subjects: the robot competition and the student-student cooperation among the participating universities. The competition is designed to be remotely controlling a robot via the internet to cooperate/compete with a locally controlled robot to finish some specified tasks where both robots are made by the students. The unique feature of the project is that everything concerned with the competition, e.g. the competition rules, the detailed technical problems, etc., are discussed and solved by the students themselves via the internet based cooperation. The demonstration of the competition between UEC and each of the partner universities proves the project helps to improve students' practical ability, innovative skills, good teamwork spirit, and communication skills, etc. © 2011 IEEE.

Nundrakwang, Songmoung

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