• Title, Summary, Keyword: 가속도센서

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Evaluation of Inertial Measurement Sensors for Attitude Estimation of Agricultural Unmanned Helicopter (농용 무인 헬리콥터의 자세추정을 위한 관성센서의 성능 평가)

  • Bae, Yeonghwan;Oh, Minseok;Koo, Young Mo
    • Current Research on Agriculture and Life Sciences
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    • v.32 no.2
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    • pp.79-84
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    • 2014
  • The precision aerial application of agricultural unmanned helicopters has become a new paradigm for small farms with orchards, paddy, and upland fields. The needs of agricultural applications require easy and affordable control systems. Recent developments of MEMS technology based on inertial sensors and high speed DSP have enabled the fabrication of low-cost attitude system. Therefore, this study evaluates inertial MEMS sensors for estimating the attitude of an agricultural unmanned helicopter. The accuracies and errors of gyro and acceleration sensors were verified using a pendulum system. The true motion values were calculated using a theoretical estimation and absolute encoder measurement of the pendulum, and then the sensor output was compared with reference values. When comparing the sensor measurements and true values, the errors were determined to be 4.32~5.72%, 3.53~6.74%, and 3.91~4.16% for the gyro rate and x-, z- accelerations, respectively. Thus, the measurement results confirmed that the inertial sensors are effective for establishing an attitude and heading reference system (AHRES). The sensors would be constructed in gimbals for the estimating and proving attitude measurements in the following paper.

Fabrication of an acceleration sensor using silicon micromachining and reactive ion etching (실리콘 마이크로머시닝과 RIE를 이용한 가속도센서의 제조)

  • Kim, Dong-Jin;Kim, Woo-Jeong;Choi, Sie-Young
    • Journal of Sensor Science and Technology
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    • v.6 no.6
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    • pp.430-436
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    • 1997
  • A piezoresistive acceleration sensor for 30 G has been fabricated by silicon micromachining method using SDB(silicon direct bonding) wafer. The structure of the piezoresistive acceleration sensor consists of a seismic square pillar type mass and four beams. This structure was fabricated by reactive ion etching and chemical etching using KOH-etchant. The rectangular square structure is used in order to compensate the deformation of the edges due to underetching. The fabricated sensor showed a linear output voltage-acceleration characteristics and its sensitivity was about $88{\mu}V/V{\cdot}g$ from 0 to 10 G.

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A Study on Vibration Measurement Using LabVIEW and Acceleration Sensor (LabVIEW와 가속도 센서를 이용한 진동신호 측정에 관한 연구)

  • Park, Jiye;Moon, Chae-Joo;Kim, Tae-Gon;Jeong, Moon-Seon
    • Proceedings of the KIPE Conference
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    • pp.129-130
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    • 2012
  • 본 논문에서는 3축 가속도 센서의 부착 방법과 위치에 따른 진동 신호의 주파수 특성을 분석하였다. 날개 하나가 깨진 환풍기를 철제 기둥에 나사로 고정하고 회전수를 50rpm, 1710rpm, 2400rpm으로 각기 달리하여 진동을 발생 시켜 가속도 센서의 부착 방법과 위치에 따른 진동 신호를 측정하고 비교하였다. 3축 가속도 센서를 측정하기 위한 측정 소프트웨어를 설계 제작하였으며, 센서의 진동을 비교한 결과 실험에 사용된 회전수에서는 각각의 부착 방법보다는 부착 위치에 따른 진동의 차이가 있는 것으로 나타났다.

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Pose Control of Mobile Inverted Pendulum using Gyro-Accelerometer (자이로-가속도센서를 이용한 모바일 역진자의 자세 제어)

  • Kang, Jin-Gu
    • Journal of the Korea Society of Computer and Information
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    • v.15 no.10
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    • pp.129-136
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    • 2010
  • In this paper proposed the sensor fusion algorithm between a gyroscope and an accelerometer to maintain the inverted posture with two wheels which can make the robot body move to the desired destination. Mobile inverted robot fall down to the forward or reverse direction to converge to the stable point. Therefore, precise information of tilt angles and quick posture control by using the information are necessary to maintain the inverted posture, hence this paper proposed the sensor fusion algorithm between a gyroscope to obtain the angular velocity and a accelerometer to compensate for the gyroscope. Kalman Filter is normally used for the algorithm and numerous research is progressing at the moment. However, a high-performing DSP and systems are needed for the algorithm. This paper realized the robot control method which is much simpler but able to get desired performance by using the sensor fusion algorithm and PID control.

Fabrication and Characteristics Comparison of Piezoresistive Four Beam Silicon Accelerometer Based on Beam Location (빔 위치변화에 따른 4빔 압저항형 실리콘 가속도 센서의 제조 및 특성비교)

  • Shin, Hyun-Ok;Son, Seung-Hyun;Choi, Sie-Young
    • Journal of the Korean Institute of Telematics and Electronics D
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    • v.36D no.7
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    • pp.26-33
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    • 1999
  • In order to examine the effect of beam location n the performance of bridge type piozoresistive silicon accelerometer, three sensors having different location of beams were simulated by FEN(finite element method) and fabricated by RIE(reactive ion etching) and KOH etching method using SDB(silicon direct bonding) wafer, Results of the FEM simulation present that the 1st resonace frequency and Z axis sensitivity of each sensor are identical but the 2nd, and the 3rd resonace frequency and X, Y axis sensitivity are different. Even though the 1st resonance frequency and Z axis sensitivity measured from fabricated sensors do not perfectly coincide with each other, all 3 type sensors present 180 ~ 220N/G of Z sensitivity at 5 V supply voltage and 1.3 ~ 1.7kHz of the 1st resonance frequency and about 2% of lateral sensitivity.

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Evaluation of Low-cost MEMS Acceleration Sensors to Detect Earthquakes

  • Lee, Jangsoo;Kwon, Young-Woo
    • Journal of the Korea Society of Computer and Information
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    • v.25 no.5
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    • pp.73-79
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    • 2020
  • As the number of earthquakes gradually increases on the Korean Peninsula, much research has been actively conducted to detect earthquakes quickly and accurately. Because traditional seismic stations are expensive to install and operate, recent research is currently being conducted to detect earthquakes using low-cost MEMS sensors. In this article, we evaluate how a low-cost MEMS acceleration sensor installed in a smartphone can be used to detect earthquakes. To this end, we installed about 280 smartphones at various locations in Korea to collect acceleration data and then assessed the installed sensors' noise floor through PSD calculation. The noise floor computed from PSD determines the magnitude of the earthquake that the installed MEMS acceleration sensors can detect. For the last few months of real operation, we collected acceleration data from 200 smartphones among 280 installed smartphones and then computed their PSDs. Based on our experiments, the MEMS acceleration sensor installed in the smartphone is capable of observing and detecting earthquakes with a magnitude 3.5 or more occurring within 10km from an epic center. During the last several months of operation, the smartphone acceleration sensor recorded an earthquake of magnitude 3.5 in Miryang on December 30, 2019, and it was confirmed as an earthquake using STA/LTA which is a simple earthquake detection algorithm. The earthquake detection system using MEMS acceleration sensors is expected to be able to detect increasing earthquakes more quickly and accurately.

Smartphone Controller System using 3-D Acceleration Sensor (3축 가속도센서를 이용한 스마트폰 컨트롤러 시스템)

  • Na, Young-Sik;Chung, Dong-Kun;Lee, Ki-Young
    • The Journal of The Institute of Internet, Broadcasting and Communication
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    • v.10 no.4
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    • pp.23-28
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    • 2010
  • Recently, as the number of people using Smartphones increased, several researches has been launched basing it's subject on this issue. In this circumstance, the fusion of sensor technologies and Smartphone offers a variety of functions. The system introduced in the current paper uses a controller which extracts information about accelerating movements of an user. This information is then sent to the Smartphone through Bluetooth communication. The input method proposed in this paper differs from the existing methods such as touch typing or button input in Smartphones. It rather uses the 3-D acceleration sensor which enables users to control their Smartphone anywhere and anytime without directly touching the device. Furthermore, because it is developed for various applications, it can be applied in many different fields.

Development of Hybrid Sensor Module for Acceleration and Geomagnetic sensing (가속도 및 지자기 검지 기능의 복합센서 모듈 개발)

  • Park, Ho-Joon;Chae, Kyoung-Soo;Jo, Sung-Hwan;Kim, Hyun-Joon;Hahm, Ghun
    • Proceedings of the KIEE Conference
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    • pp.1633-1634
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    • 2006
  • 3축 가속도 센서, 2축 지자기 센서, 구동 ASIC 및 마이크로 컨트롤 유니트(MCU, Micro Control Unit)를 집적시킨 복합센서 모듈을 개발하였다. 센서 모듈의 사이즈는 $8.3mm{\times}5.3mm{\times}1.5mm$ (0.066 cc)로서 스택(stack) 패키징 방식으로 제작하였다. 제작된 센서 모듈의 특성은 가속도 센서와 지자기 센서 모두 목표한 범위내의 값이 얻어졌으며, 특히 까다로운 규격의 신뢰성 테스트 모두 통과함으로서 우수한 성능을 보유하고 있음을 입증할 수 있었다.

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The Running Vibration Assessment of Daegu Metropolitan Transit using Smartphone Acceleration Sensor (스마트폰 가속도센서를 이용한 대구도시철도 주행진동평가)

  • Kwon, Dong-Hee;Jang, Sung-Hyun;Mun, Hyung-Jin;Chey, Min-Ho
    • Journal of the Korea Convergence Society
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    • v.10 no.6
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    • pp.179-184
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    • 2019
  • Recently, various problems have arisen due to the popularization and aging of urban railway transit, which is the key transportation of large cities. In this study, the vibrational accelerations for the Daegu Metropolitan City Urban Railway(Line 1) were measured and evaluated using the smartphone built-in acceleration sensor and the approved application. For this purpose, the three axes running accelerations were measured according to the domestic standard (KS R 9160), and the acceleration data along the 32 stations (3 directions) were analyzed and compared. In addition, the increasing of acceleration values caused by the change of vibrational environment was monitored along the main stations between the time in 1997 and 2017. It was found that there are considerable increase of lateral and vertical directional accelerations due to the aging of railway facility environment for the last 20 years. The results of this study have valuable means for evaluating the ride quality of urban railway and the vibration influence on surrounding structures.