• Title/Summary/Keyword: unit pulse

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A Study on Automatic Seam Tracking System Using Electro-Magnetic Sensor for Sheet Metal Arc Welding of Butt Joints (박판 맞대기 용접에서 전자기식 센서를 이용한 용접선 자동 추적 시스템에 관한 연구)

  • 유병희;김재웅
    • Journal of Welding and Joining
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    • v.15 no.1
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    • pp.81-91
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    • 1997
  • In this study, a magnetic sensor to make use of eddy current was developed to detect the weld seam of butt joint in the sheet metal arc welding. This system consist of the sensor device for detecting the weld line, the servo control device for driving the weld torch movement and the control unit. A signal processing was applied to smooth the output signal of the sensor. The weld joint was determined by using a 1st order differential method. To improve tracking accuracy of the system, moving average method which has an effect of proportional and weighted integral control was applied to a series of the weld joint positions obtained above. The weld line for tracking was generated by using data regeneration algorithm. Based on these results, each servo motor was controlled by pulse generator. From experimental results, it was revealed that this system has excellent detecting ability for weld line and seam tracking ability.

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Simple Dynamometer for Dynamics Investigation of Induction Motor

  • Inpradab, Tanin;Pongswatd, Sawai;Masuchun, Ruedee;Ukakimapurn, Prapart
    • 제어로봇시스템학회:학술대회논문집
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    • 2005.06a
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    • pp.821-824
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    • 2005
  • This paper presents a technique to evaluate torque and speed characteristics of induction motor with the Dynamometer. The simple Dynamometer controlled via microcontroller and displayed by computer. The Microcontroller generates the PWM (Pulse Width Modulation) signal and control the duty cycle of signal for control braking level. The Buck converter is a braking unit which uses IGBT as switch in circuit. The output current of the Buck converter and output voltage of tacho generator are converted to digital signals and analyzed by microcontroller. The signals are then sent to computer for displaying torque and speed responds independent on the braking time. The test results of the Dynamometer in this research can coreectly predict the torque and speed response under reasonable tests. Moreover, this Dynamometer is easy and inexpensive to make.

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Research on a Sea Snake Robot

  • Shiozaki, Hiroshi;Shimizu, Etsuro;Ito, Masanori
    • 제어로봇시스템학회:학술대회논문집
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    • 2005.06a
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    • pp.951-956
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    • 2005
  • Since a snake achieves various movements just by a slender body, the mechanism of it is very amazing Many researches have been focusing on a snake like robot and have done for it on the ground. However the meander motion of the snake not only can be done by ground creatures, but also can be done by a water creature such as a sea snake or an eel. Therefore, the purpose of our research is to develop an autonomous underwater robot like the sea snake. As an approach to this goal, we develop an experimental sea snake-like-robot for examining basic characteristics, including propulsion, a turning and other performance. Our developed robot is composed of the head and 4 bodies. Each body equips one servomotor, which is operated with pulse signal. In the head unit, 1- chip-microcomputer, which generates the servomotor control signal for realizing a snake motion and the battery, is equipped. Our robot is covered with a rubber film for the waterproof. Using our developed robot, characteristics of the snake-like-robot moved in water are examined.

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Study on the Level Limit Switch Using a Self Made 1-3 type Ceramic/Polymer Composite Ultrasonic Transducer (1-3형 복합압전체 초음파 트랜스듀서를 사용한 레벨Limit스위치에 관한 연구)

  • Park, K.I.;Kim, H.G.;Shin, K.H.;SaGong, G.
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2003.07b
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    • pp.756-759
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    • 2003
  • In this study, an ultrasonic transducer is fabricated with a 1-3 type composite resonator. Pulse-echo responses of an ultrasonic transducer are investigated in underwater with the designated water-levels. LED output signals of a level limit switch with changing a water level are obtained by using the currently developed self-made 1-3 type composite transducer and electric measuring unit. LED is turned on at above the up-limit level with increasing a water level, and LED is turned on at less than the down-limit level with decreasing a water level.

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A Study on the Sensor for Measuring Near-distance Variation by using Ultrasonic Transducer (초음파 트랜스듀서를 사용한 근접거리변동 측정용 센서개발에 관한 연구)

  • Yang, Yun-Suk;Shin, Young-Lok;Kim, Chul-Han;SaGong, Geon
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2000.05b
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    • pp.175-178
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    • 2000
  • In this study, the ultrasonic transducer was fabricated with piezoceramic-polymer 1-3 type composites. Pulse-echo response of that transducer in water was investigated with variable water-level. Output of LED was under the control of the signal, which was analyzerd by the self-made Electric Unit. This paper represents automatically water-detecting system with variable water level. There was in good agreement water level between the virtual level and output signal by using the self-made water-detecting system.

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SRM drive system with reduced harmonics and improved power factor (고조파감소 및 역률개선을 위한 SRM 구동시스템에 관한 연구)

  • 신규재;권영안;임근희
    • Journal of the Korean Institute of Telematics and Electronics S
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    • v.34S no.10
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    • pp.151-157
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    • 1997
  • Switched relutance motor(SRM) has the advantages of simple structure, low rotor intertia, and high power rate per unit volume. However, SRM has the disadvantages of high current harmonics, and low power factor because of the discontinuous excitation of pulse type. The harmonics brings about the distortion and loss of power system, and brings about the incorrect opertion of electronic system. This paper investigates the SRM drive system with the reduced harmonics and improved power factor. The system consists of the switching power converter with poewr factor correction(SPC-PFC), DC/DC converter and 3-phase inverter. The performances in the proposed system are verified through the simpuation and experiment.

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IPMSM Vector Control using MPC5554 for HEV (MPC5554를 이용한 HEV용 IPMSM 벡터제어)

  • Moon, Jung-Song;Lee, Jung-Hyo;Ha, In-Yong;Won, Chung-Yuen
    • Proceedings of the KSR Conference
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    • 2010.06a
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    • pp.213-219
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    • 2010
  • MCU(Micro Controller Unit) used for the automobiles has been required for improving of the safety and high reliability. Also, the necessity of high performance MCU equipped with high fuel-efficiency has been risen according to increased requests of high fuel-efficiency and improving the occupants safety with the development of intelligent vehicles and future vehicles. The MPC5554 32-bit embedded controller, made by Freescale Semiconductor, specialized in the part of the power train provides the high reliability, fast interrupt process and real-time control. In This paper, the investigation on IPMSM using MPC5554 has been performed. Also SVPWM(Space Vector Pulse Width Modulation) is implemented to the servo system.

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Study on engineering properties of ready-mixed soil and slag

  • Chen, Tung-Tsan;Ho, Chun-Ling;Wang, Her-Yung
    • Computers and Concrete
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    • v.21 no.5
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    • pp.531-538
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    • 2018
  • The slag through sieve #4 replaced the natural fine aggregate in different proportions (0-50%) to make ready-mixed soil and slag (RMSAS). The fresh properties studied, and the concrete specimens were produced to test the hardened properties at different ages. Results showed that the workability of RMSAS decreases when the replacement increases. The unit weight increases with the replacement. The setting time extends when the replacement decreases and shortens when the replacement increases. The compressive strength, ultrasonic pulse velocity and hammer rebound value increase with the replacement. However, the high-replacement results decrease because of the expansion factor at late age. Resistivity is close and less than $20k{\Omega}-cm$. After the industrial of steelmaking by-products are processed properly, they can be used in civil engineering, not only as a substitute for natural resources and to reduce costs, but also to provide environmental protection.

Analysis on Shielding Effectiveness of Electromagnetic Wave in Fire Pipes (물이 채워진 소화 배관의 전파 차폐도 해석)

  • Kim, Yoon-Jeung
    • Fire Science and Engineering
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    • v.30 no.4
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    • pp.94-102
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    • 2016
  • When establishing shielding facilities for EMP protection, WBC effect is used to protect fire pipes and honeycomb cells are inserted into the fire pipes to improve the shielding effectiveness. At this point, the smaller unit cell of honeycombs becomes, the more likely it interrupts the flow of water, which ends up clogging the fire pipes with sediment. To prevent this phenomenon, I would suggest a design method due to the pilarization loss of water molecules that contributes to increasing the size of honeycomb cells and remaining thin-walled sufficient for required shielding effectiveness.

Characteristics of A Tunable OADM Using A Fiber-Optic Delay-Line Transversal Filter (광섬유 지연서로 트랜스버설 필터를 이용한 파장 가변 OADM의 특성)

  • 윤찬호
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.25 no.10B
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    • pp.1707-1713
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    • 2000
  • We have proposed a tunable optical ADM using a fiber-optic transversal filter which is composed of fiber couplers and metal-film coated fiber-optic tapped delay-lines with a flat spectral response in abroad range of wavelength. Simulation results show that the optical loss at the DROP and PASS wavelengths of the OADM is negligible and the wavelength tunability is 0.78${\mu}{\textrm}{m}$/ps for the unit time delay of 2 ps. In order to investigate the effects of wavelength drift of the imput optical signal on the OADM the loss at the DROP port and the crosstalks to the other ports have been calculated. The maximum bit rates have been calculated at 46.26 Gb/s for the input Gaussian pulse width of 10 ps.

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