Songsuwankit, Kanoknuch
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Songsuwankit, Kanoknuch
Alternative Name
Songsuwankit, K.
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Email
kanoknuch.so@kmitl.ac.th
8 results
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Item type:Publication, Electronically adjustable phase shifter using OTAs(2010-12-01); ; First-order phase shifter using operational transconductance amplifiers (OTAs) as active elements is presented in this paper. The corner frequency of the proposed phase shifter can be adjusted by electronic means. The purpose of this paper is emphasized on simple configuration and low cost. The phase response between input and output signals against the operating frequency is varied from 180 to 0 degrees of phase lead. The principle of the proposed circuit is confirmed by simulation and experimental results. To verify the proposed circuit performance, the sinusoidal oscillator is provided for circuit application. ©ICROS. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Comparison of Reduced-Length FFT-Based Feature for Induction Motor Fault Classification(2025-01-01); ; This research presents a comparison of FFT-based features which can be used for classifying induction motor faults via neural network. In this paper, the misalignment and rotor bar damage faults are investigated by using stator current as input data only. As the length of the full FFT can include both informative data corresponding to the faults and uninformative data such as noise from environment or electrical supply, only relevant magnitude from FFT bins should be selected and used instead. This paper proposed to use threshold level determined from the magnitude of FFT bins in dataset as a criterion for the selection. From experimental results, an input feature vector created by proposed method can create short input feature vector length to be used by neural network efficiently. The trained neural network performs classification task at 99.98% in accuracy. Comparing to using dimension reduction by PCA, thresholding method needs basic computation, and yields result close to PCA method. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Simple LVDT signal to DC converter(2017-02-18); ; A simple technique to produce a linear signal from a displacement transducer, linear variable differential transformer (LVDT), is introduced in this paper. The two-quadrant divider is used to precede the ratio of a different and sum of the two winding signals from the LVDT instead of a four-quadrant divider of a recent approach. The two- quadrant divider is obtained by an operational transcondutance amplifier (OTA) in the form of a voltage-tocurrent converter. The signal from the divider is held by the sample and hold circuit (SHC) controlled by the peak-amplitude finder. As a result, the held signal is achieved without using a low-pass filter. The temperature effect of both OTA and LVDT are compensated. The merit of the proposed technique is that the circuit requires without the low-pass filter. Therefore, the fast response is obtained. The performance of the proposed scheme is confirmed by the experimental results using commercial devices. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Two-Tier AI Surveillance: Enhancing Weapon Detection Through Edge and Cloud Collaboration(2026-01-01); - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Simple LVDT signal conditionerA method to implement a signal conditioning circuit for a linear variable differential transformer (LVDT) is proposed in this article. The proposed signal conditioner can be used instead of a synchronous demodulator in the tradition approaches. The output signal of the signal conditioner is linearly proportional to the moving core of the LVDT with fast response. The realization technique is based on the use of an analog integrator to determine the LVDT signal at the half period of the excitation signal. The proposed signal conditioner provides without low-pass filter in the signal path. Therefore, the response time of the proposed technique is settled within half period of the excitation signal. The devices used in the proposed signal conditioner consist of basic commercially available devices such as operational amplifier (opamp), comparator, analog switch and one-shot timer. Experimental results demonstrated the performance of the proposed conditioner are included. The proposed technique is attractive in terms of simple configuration and low cost. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Linear-range extension for linear variable differential transformer using triangular signal(2018-12-10); ; This paper presents a linear range extension technique for the linear variable differential transformer (LVDT). The technique is based on a signal conditioning circuit using the analog lookup table, which provides very high resolution of resulting signal. The analog table which is obtained by the triangular signal generator, which has the frequency equal to the excitation frequency. Meanwhile, the referenced signal is obtained by the comparison between the excitation signal and the output signal of LVDT. It is used to synchronize with the triangular signal. The proposed technique is simply circuit configuration and it can be implemented using available commercial devices. The experiment shows that the performances of the proposed circuit can be extended from the normal operating range of LVDT to the maximum stroke range. In addition, the response time of the proposed techniques can be approximated as half period of the excitation signal. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Linear range extension for LVDT using analog lookup table(2018-08-13); ; A technique to extend the operating range of the linear variable differential transformer (LVDT) is presented in this article. The realization method is based on the analog lookup table achieved by the ramp signal generator where the frequency of ramp signal is equal to the excitation frequency. Therefore, the resolution of the resulting signal is very high. The output signals of the LVDT are provided to generate the reference signal to synchronize with the ramp signal. The proposed technique can extend the operating range of the LVDT from a normal operating range provided by the specification of the LVDT to maximum stroke range of the LVDT. The circuit of the proposed technique is simple and can be implemented using the commercial devices. The experimental results confirmed that the circuit performance are good agreement with the expected results. The response time of the proposed technique is about two periods of the excitation frequency. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Low-Cost System for Investigating a Small Motor Fault Classification Based on Current Signal(2025-01-01); ; This research presents low-cost system for motor fault classification. This system uses a microcontroller with built-in ADC and communication capability. The two purposes of this article are to investigate the quality of the system for data acquisition and capability of the system for detecting early motor faults both by microcontroller on the system and personal computer. The embedded software on the system is designed to record current signals from a current sensor, compute FFT-based features and classify the fault based on tinyML method. Data communication between the system and the personal computer can be done by both serial port and TCP socket over Wi-Fi. The performances of the system and the personal computer are compared by the experiment as well as the quality of data recorded from the built-in ADC and a digital oscilloscope. The broken rotor bar and bearing fault in a 2.2kW induction motor are investigated. The classifier used in the experiment is a small feed forward neural network which can be implemented on both the proposed low-cost system and the personal computer. Although the recorded electrical current data by built-in ADC is contaminated with noise, the fault classification on the personal computer yield accuracy up to 90%.