• Title/Summary/Keyword: Ultrasonic Experiment

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Exhaust Emissions Characteristics of a Small Diesel Engine using Rice-bran Oil (미강유 적용 소형 디젤엔진의 배기배출물 특성)

  • 나우정;유병규;정진도
    • Journal of Biosystems Engineering
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    • v.23 no.2
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    • pp.125-134
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    • 1998
  • It seems possible, by use of vegetable oils, to solve the pollution problem caused by the exhaust gas from diesel-engine vehicles. Recently vegetable oils has received considerable attention as an alternative and clean energy source to the foreseeable depletion of world oil supplies. The objective of this study is to experimentally investigate the characteristics of exhaust emissions of a small diesel engine using light oil, rice-bran oil, heated rice-bran oil, rice-bran oil treated with ultrasonic energy. SO$_2$ emission from the pure and the treated rice-bran oils was not detected at speeds hgher than 1,800 rpm while that from the light oil was detected at all the speeds at 4/4 load. NOx emission form these vegetable oils was generally higher compared to that from the light oil for most of the test conditions. tendency opposite to that of NOx emission. The data obtained in this experiment may be applicable for the desist of small diesel engine using the alternative fuels.

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Development of an ultrasonic urination sensor for measurement of bladder urine volume (방광내 뇨량 측정을 위한 초음파 뇨의 센서의 개발)

  • Kim, D.J.;Choi, C.K.;Choi, H.H.
    • Proceedings of the KOSOMBE Conference
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    • v.1998 no.11
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    • pp.151-152
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    • 1998
  • The sensing of urination level of bladder urine volume is effective for preventing the urinary incontinence which is one of the three major infirmities afflicting the elderly. In this study, we found that it is useful for manufactured ultrasonic urination sensor to measure between distance of anterior and posterior wall of bladder, as a preliminary experiment. Also, Thee was a intimate interrelation between urine volume level and interwall distance of bladder.

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Design of Cylinder Horn for Ultrasonic Welding (초음파 용접용 실린더 혼의 설계)

  • Kim, Sun-Rak;Lee, Jae-Hak;Yoo, Choong-D.
    • Journal of Welding and Joining
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    • v.27 no.4
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    • pp.60-66
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    • 2009
  • The cylinder horn is designed to increase uniformity of the displacement on the output face through simulation and experiments for the simple cylinder, spool and step horns. The modal analysis is conducted numerically to calculate the vibration mode and stress distribution of the cylinder horn, and the design of experiment (DOE) technique is employed to determine the optimum configuration of the spool horn. Displacement of the cylinder horn was measured using the Laser Doppler Vibrometer (LDV), and experimental results show good agreements with the predicted results. It appears that uniformity higher than 95% can be achieved with the spool horn when the proper dimension of the groove is used.

LOS (Line of Sight) Algorithm and Unknown Input Observer Based Leader-Follower Formation Control (LOS 알고리듬과 미지 입력 관측기에 기초한 선도-추종 대형 제어)

  • Yoon, Suk-Min;Yeu, Tae-Kyeong;Park, Seong-Jea;Hong, Sup;Kim, Sang-Bong
    • Journal of Institute of Control, Robotics and Systems
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    • v.16 no.3
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    • pp.207-214
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    • 2010
  • This paper proposes about decentralized control approach based Leader-Follower formation control using LOS (Line of Sight) algorithm and unknown input observer. The position of robots which is a basic information in multi-robot or single robot motion control is determined by localization algorithm fusing UPS (Ultrasonic Position System) and kinematics model. For formation control, a decentralized control approach individually installing a local controller in leader and follower robot is adopted. Leader robot is controlled to track a specified trajectory by LOS algorithm, and the other robots follow the leader by local controller based on tracking platoon level function, self-sensing data and estimated information from unknown input observer. The performance of proposed method is proven through the formation experiment of two vehicle models.

A Study on Fabrication and Characteristics of PZT Probe for Nondestructive Test (비파괴 검사를 위한 PZT 탐촉자의 제작 및 특성에 관한 연구)

  • 김철수;정규원;송준태
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.11 no.8
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    • pp.613-619
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    • 1998
  • Ultrasonic probes of 400kHz, 1MHz were fabricated using PZT-5Z plates. Epoxy was used for backing layer materials onthe plates. Nondestructive Test was carried using these probes. Pulse lobe width of impulse response was reduced 15.4% compare 1MHz with 400kHz and 96.6% compare 3MHz with 400kHz. The attenuation in aluminum was 2.05[dB/m] at 400kHz, 4/91[dB/m] at 1MHz, 7.35[dB/m] at 3HMz. Hole detection error of the first hole was 22.4% at 1HMz, 9.% at 3HMz, The second hole 11.6% at 1HMz, 4.7% at 3HMz. In the result of experiment of the hole detection error and resolution, 3HMz probe was the best among them.

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Evaluation on Soundness of Cast-In-Place Gutter Concrete Under Freezing-Thawing and Chloride Attack (염해 및 동결융해 작용을 받은 현장타설 측구 콘크리트의 건전도 평가)

  • Lee, Tae-Gyu;Kim, Gyu-Yong;Kang, Yeon-Woo;Kim, Soon-Mook;Choe, Gyeong-Cheol
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2015.05a
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    • pp.78-79
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    • 2015
  • For estimating compressive strength of concrete, non-destructive test has conducted generally. It used experimental equation to calculate compressive strength from construction. This study investigated experiment to apply non-destructive test, based on fresh property, compressive strength and ultrasonic pulse velocity of high performance concrete. And it conducted to compare various proposed equation.

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3-D Object Recognition and Restoration Independent of the Translation and Rotation Using an Ultrasonic Sensor Array (초음파센서 배열을 이용한 이동과 회전에 무관한 3차원 물체인식과 복원)

  • Cho, Hyun-Chul;Lee, Kee-Seong;SaGong, Geon
    • Proceedings of the KIEE Conference
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    • 1996.07b
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    • pp.1237-1239
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    • 1996
  • 3-D object recognition and restoration independent of the translation and rotation using an ultrasonic sensor array, neural networks and invariant moment are presented. Using invariant moment vectors on the acquired $16{\times}8$ pixel data, 3-D objects can be classified by SOFM(Self Organizing Feature Map) neural networks. Invariant moment vectors kept constant independent of the translation and rotation. The experiment result shows the suggested method can be applied to the environment recognition.

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Command Fusion for Navigation of Mobile Robots in Dynamic Environments with Objects

  • Jin, Taeseok
    • Journal of information and communication convergence engineering
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    • v.11 no.1
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    • pp.24-29
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    • 2013
  • In this paper, we propose a fuzzy inference model for a navigation algorithm for a mobile robot that intelligently searches goal location in unknown dynamic environments. Our model uses sensor fusion based on situational commands using an ultrasonic sensor. Instead of using the "physical sensor fusion" method, which generates the trajectory of a robot based upon the environment model and sensory data, a "command fusion" method is used to govern the robot motions. The navigation strategy is based on a combination of fuzzy rules tuned for both goal-approach and obstacle-avoidance based on a hierarchical behavior-based control architecture. To identify the environments, a command fusion technique is introduced where the sensory data of the ultrasonic sensors and a vision sensor are fused into the identification process. The result of experiment has shown that highlights interesting aspects of the goal seeking, obstacle avoiding, decision making process that arise from navigation interaction.

Measurement of Sound Speed Following the Fluid Temperature Using Acoustic Inspection Device

  • Jeon, E.S.;Kim, W.T.;Kim, I.S.;Park, H.
    • Journal of the Korean Society for Nondestructive Testing
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    • v.30 no.3
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    • pp.207-211
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    • 2010
  • In this paper, the fluid AID(acoustic inspection device) was developed to measure SOS(speed of sound) since fluids used in most of industrial fields have different properties and its equipment is highly expensive. From AID developed, it is intended to get potentially the capability to distinguish the kind of fluid using the measurement by the SOS at various fields. In order to measure the sound speed of specific fluids, the measurement system and ultrasonic sensors are composed. The fluid used in the experimental work are soybean oil, glycerin, diesel oil and the error of time difference due to the container wall is extracted for preliminary experiment. As results, the variations of sound speed according to the temperature change of target fluid were analyzed and the polynomial equations were proposed.

Development of Sensor Fusion-Based Low-Speed Short-Distance Collision Warning Algorithm for Urban Area (도시 환경을 위한 센서 융합 기반 저속 근거리 충돌 경보 알고리즘 개발)

  • Jeon, Jong-Ki;Kim, Man-Ho;Lee, Suk;Lee, Kyung-Chang
    • IEMEK Journal of Embedded Systems and Applications
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    • v.6 no.3
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    • pp.157-167
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    • 2011
  • Although vehicles become more intelligent for convenience and safety of drivers, traffic accidents are increased more and more. Especially, car-to-car single rear impacts in the urban area are increased rapidly because of driver inattention. To prevent rear impacts in the urban area, commercial automobile vendor applies the low-speed short-distance collision warning system. This paper presents low-speed short-distance collision warning algorithm for the city driving by using sensor fusion of laser sensor and ultrasonic sensor. An experiment using embedded microprocessor in the driving track was used to demonstrate the feasibility of the collision warning algorithm.