• Title, Summary, Keyword: stand-alone sensor unit

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Vibration Powered Generator System for Stand-Alone Health Monitoring Sensor Unit (건전도 감시용 자립형 계측유닛을 위한 진동발전시스템)

  • 최남섭;김재민
    • Journal of the Earthquake Engineering Society of Korea
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    • v.7 no.2
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    • pp.85-92
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    • 2003
  • This paper presents an electric power generating system for stand-alone health monitoring sensor unit of bridge structure based on ambient vibration of bridge. In this paper, a novel electric power generator which has minimum effect of armature reaction is proposed. The related mechanical and electrical design equations are obtained, and a pilot generator has been implemented. In addition, the charging system for extremely low generator current is discussed, and some improvements are identified for the system. This investigation reveals that diode characteristics of rectifier is dominant factor in the charging process. Finally, both the simulation, which uses real measurement data of the Namhae bridge as input of the pilot generator, and indoor test are carried out. The results showed the applicability and effectiveness of the stand-alone vibration powered generator.

A Study on Stand-Alone Electric Power Generator Using Bridge Vibration (교량진동을 이용한 진동형 자가발전기에 대한 연구)

  • 최남섭
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • pp.313-316
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    • 2003
  • This paper presents stand-alone electric power generator using bridge vibration for charging system of health monitoring sensor unit of bridge structure. In this paper, a novel electric power generator utilizing vertical vibration is proposed, which has minimum effect of armature reaction, and the related mechanical and electrical design equations are obtained and then a pilot electric power generator has been implemented. Moreover, the free oscillation test reveals that diode characteristics of rectifier is dominant factor in charging process. Also, simulation results with the Namhae bridge data showed the validity and effectiveness for stand-alone electric power generation.

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Control of PKM machine tools using piezoelectric self-sensing actuators on basis of the functional principle of a scale with a vibrating string

  • Rudolf, Christian;Martin, Thomas;Wauer, Jorg
    • Smart Structures and Systems
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    • v.6 no.2
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    • pp.167-182
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    • 2010
  • An adaptronic strut for machine tools with parallel kinematics for compensation of the influence of geometric errors is introduced. Implemented within the strut is a piezoelectric sensor-actuator unit separated in function. In the first part of this contribution, the functional principle of the strut is presented. For use of one piezoelectric transducer as both, sensor and actuator as so-called self-sensing actuator, the acquisition of the sensing signal while actuating simultaneously using electrical bridge circuits as well as filter properties are examined. In the second part the control concept developed for the adaptronic strut is presented. A co-simulation model of the strut for simulating the controlled multi-body behavior of the strut is set-up. The control design for the strut as a stand-alone system is tested under various external loads. Finally, the strut is implemented into a model of the complete machine tool and the influence of the controlled strut onto the behavior of the machine tool is examined.

Design and Performance Analysis of NHC/ZUPT Kalman Filter with Mounting Misalignment Estimation (NHC/ZUPT의 장착 비정렬 추정 칼만필터 설계 및 성능분석)

  • Park, Young-Bum;Kim, Kap-Jin;Park, Jun-Pyo
    • Journal of the Korea Institute of Military Science and Technology
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    • v.12 no.5
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    • pp.636-643
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    • 2009
  • NHC means that the velocity of the vehicle in the plane perpendicular to the forward direction is almost zero. The main error source of NHC is the mounting misalignment which is the difference between the body frame of a land vehicle and the sensor frame of an inertial measurement unit. This paper suggests new NHC algorithm that can reduce position errors by real-time estimation of mounting misalignment. Then NHC/ZUPT integrated land navigation system is designed and its performances are analyzed by simulations with van test data. Simulation results show that the proposed NHC/ZUPT land navigation system improves navigation accuracy regardless of misalignment angle and is very useful when SDINS operates stand-alone for land vehicle navigation with large mounting misalignment.

A Study on the Production of a Convergence Color-Responsive Lighting Bookcase (색상에 반응하는 융복합 조명 책꽂이 제작에 관한 연구)

  • Kang, Hee-Ra
    • Journal of Digital Convergence
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    • v.13 no.6
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    • pp.267-273
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    • 2015
  • Recently, a wide range of products incorporating cutting-edge technology are being introduced in various sectors of design. Belkin's WeMo or Phillips' Hue are representative examples. In this context, the color-responsive lighting bookcase is a design product that would satisfy the needs of contemporary consumers who seek entertainment in their purchases. By installing lightings that change color according to the user's behavior, this design reconceptualizes the bookcase as a source of entertainment rather than a mundane object of household furnishing. The lighting apparatus can be detached and reattached, serving as stand-alone equipment. The lighting bookcase is modularized, comprising extensions equipped with MCU (Micro Controller Unit), RGB LED and color sensors. The bookcase as a whole is extendable towards four directions up to nine units with the lighting bookcase at the center. The extended, multiple lighting bookcases are wired to receive power from the main bookcase, and are equipped with RGB LEDs but not with MCUs or color sensors. Receiving power and color signals from the main lighting bookcase, the sub-bookcases feature changing shades of color. Also, it includes IoT(internet of Things). This study is a proposal of a design product, modularized to control the shades of the bookcase lighting using these sensors.