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  • Title/Summary/Keyword: Driving Part

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A Study of Advanced Spherical Motor for Improvement of Multi-DOF Motion

  • Park, Hyun-Jong;Cho, Su-Yeon;Ahn, Han-Woong;Lee, Ho-Jun;Won, Sung-Hong;Lee, Ju
    • Journal of Electrical Engineering and Technology
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    • v.7 no.6
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    • pp.926-931
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    • 2012
  • Since robot industry growing, the machine that could move with multi-DOF has been studied in many industrial fields. Spherical motor is one of the multi-DOF machine that doesn't need gear for multi-DOF motion. Unlike conventional motor, spherical motor can not only rotate on the shaft axis (rotating motion), but tilt the shaft with 2-DOF motion (positioning motion). In the typical type of spherical motor, one coil took part in positioning motion and rotating motion at the same time. As the result, the control algorithm was complex. To solve this problem, this study proposed a novel type of coil on the stator. The coils were separated for positioning motion and rotating motion. Thus the linkage flux of rotating coil didn't be affected the positioning angle. In this paper, comparing the back-EMF of typical and novel type was conducted and the driving experiment was carried out as the positioning angle. From the experiment result, the performance of proposed spherical motor could be verified.

Studies of Printing Head Fabrication Process For Mano Metal Printing System (메탈 인쇄용 압전 헤드 제작 프로세스 연구)

  • Yoo, Young-Seuck;Kim, Young-Jae;Sim, Won-Chul;Park, Chang-Sung;Joung, Jae-Woo;Oh, Yong-Soo
    • Proceedings of the KIEE Conference
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    • 2006.07c
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    • pp.1623-1624
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    • 2006
  • It is a paper for design, manufacture and estimation of industry inkjet head. Simulations for Actuator, Ink flow and Ejection are executed for securing design ability. Relations between droplet and properties of ink are explained closely through simulation for nozzle. Actually, two silicon plates are made by dry and wet etching and directly bonded. PZT materials is attached on the bended ink flow part and cut to 540μm interval by dicing saw. Actuator was seen variation within 10% between simulation and actual head. Through the ejection estimation, it is shown that stabilized driving voltages change according to viscosity and surface tension of metal ink. Using the metal ink of viscosity of 4.8 cps and surface tension of 0.025 N/m, it is possible to eject the stable droplets with 5m/s, 20 pl, 5 kHz.

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Analysis of an Automotive Fire Case that a Fire Broke out during Driving Immediately after DPF Cleaning (DPF 클리닝 직후에 주행 중 발생한 승용차화재 사례의 분석)

  • Lee, Euipyeong
    • Transactions of the Korean Society of Automotive Engineers
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    • v.24 no.5
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    • pp.556-565
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    • 2016
  • As a result of the enforced control of emission, many devices, including the diesel particulate filter, have been installed in diesel cars to reduce the emission of particulate matters. In this study, a car fire case has been investigated and analyzed. A car fire broke out after the vehicle traveled a distance of 1.4 km from a car service center. The car was provided with DPF cleaning when the DPF warning light came on. After being dismantled in the engine room, the car's engine and gearbox were investigated. The findings showed that the rear part of the DPF metal case was melted and punctured, while the honeycomb filter of the DPF was damaged. The car fire was caused by an overheated DPF associated with inaccurate maintenance practice. Therefore, the responsibility of the fire rested on the car service center that performed the DPF cleaning.

A Study on Structural Safety Analysis of Hub Space (허브스페이스의 구조적 안전성 해석에 대한 연구)

  • Han, Moonsik;Cho, Jaeung
    • Transactions of the Korean Society of Automotive Engineers
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    • v.23 no.3
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    • pp.352-359
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    • 2015
  • This study investigates the analysis result of structure and fatigue due to the models of the hub space with bolt joint at wheel and the existence or nonexistence of hub ring as the part of suspension system of vehicle. As the static analysis result, the structural vulnerability can be found at hub bolt and the center of wheel at three models. Model 2 and 3 have nearly same deformation and model 1 can be endured at the least load among three models. As the fatigue analysis result, fatigue lives of three models are same at the severest load of SAE bracket history. As many screw threads of weak bolts are jointed in case of model 1, model 1 is shown to be the weakest at fatigue damage among three models. By the result of this study, model 1 with bolt joint becomes most weakest among three models. As model 2 with no hub ring and model 3 with hub ring have the nearly same states of analysis results, hub ring is shown to have no influence on the safety of automotive driving.

Design of Implantable Transducer for Middle Ear Hearing Aid (이식형 중이용 청각보조 트랜스듀서의 설계)

  • Park, H.O.;Song, B.S.;Won, C.H.;Park, S.K.;Lee, S.H.;Cho, J.H.
    • Proceedings of the KOSOMBE Conference
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    • v.1996 no.05
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    • pp.243-247
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    • 1996
  • Electro-magnetic type implantable middle ear hearing aid has been empirically developed. But for further improvement of the system performance more quantitative approach is necessary. In this paper, we analyzed vibrating transducer which is most important to design the system, appropriate for given hearing level, and implemented it. Using this transducer, implantable hearing aid system are developed. To verify the design process, we experimented with driving metal strip by the developed system. From the experiment, frequency response of implemented device showed good characteristic at audio frequency and we confirmed that each part of the developed system operated well.

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Electrical Properties of Thickness-Vibration-Mode Multilayer Piezoelectric Transformer using Low Temperature Sintering (Pb,Ca,Sr,)(Ti,Mn,Sb)O3 Ceramics (저온소결 (Pb,Ca,Sr,)(Ti,Mn,Sb)O3 세라믹스를 이용한 두께진동모드 적층 압전 변압기의 전기적 특성)

  • Yoo, Ju-Hyun;Yoo, Kyung-Jin;Kim, Do-Hyung
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.20 no.11
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    • pp.948-952
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    • 2007
  • In this study, a low temperature sintering multilayer piezoelectric transformer for a DC-DC converter was manufactured using (Pb,Ca,Sr,)(Ti,Mn,Sb)O3 ceramics. Its electrical properties were investigated according to the variation in frequency and load resistance. The voltage step-up ratio of the multilayer piezoelectric transformer showed a maximum value at a resonant frequency of input part and increased with an increase of load resistance. The efficiency of the multilayer piezoelectric transformer showed the highest value at a load resistance of 17 Ω. The output power was increased with increasing input voltage. Temperature increase of the multilayer piezoelectric transformer was increased with the increase of output power. At the load resistance of 17 Ω, the multilayer piezoelectric transformer showed the temperature rises of about 20C at the output power of 18 W, and stable driving characteristics.

Development of Valve Balance Test Equipment for Power Steering Gear (파워 스티어링 기어의 밸브 밸런스 테스트 장비 개발)

  • Go, S.J.;Park, M.K.;Won, T.H.;Kim, H.S.;Kim, K.H.
    • Journal of the Korean Society of Mechanical Technology
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    • v.13 no.1
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    • pp.65-71
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    • 2011
  • Steering gear is the part of an automobile that change circular movement of steering wheel to lateral movement of rack to change driving direction. This can be classified with manual and power steering gear. Manual steering gear is operated only with human power while power steering gear use oil pressure support. These days power steering gear is more common to almost of the car. Recently a korean company manufactures a speed sensitive power steering which provide variable steering feel depend on the speed of car. The Broens company of Australia produces and exports the test equipments for the manufacture of power steering valves and assemblies to major vehicle manufactures. Some korean companies imported the test equipments from Australia, thus increasing the cost. The purpose of this study is development of the valve balance test equipment to measure the valve torque of the power steering gear. This study designed and manufactured the valve balance test equipment to take hold of the power steering valve using CAE analysis. In order to evaluate the performance of the developed valve balance test equipment, the R&R tests have been conducted.

A Study on the Influence of Strut Insulator Aging on Vehicle Noise (스트러트 인슐레이터 열화가 차량 소음에 미치는 영향에 관한 연구)

  • Son, Seong-Hyun;Kang, Sung-Su;Kim, Gug-Yong;Park, Soon-Cheol
    • Elastomers and Composites
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    • v.45 no.4
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    • pp.291-297
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    • 2010
  • Strut insulator in a vehicle is an important part to prevent noise and vibration which is created for driving on the road. Most of the viscoelastic-mounts are made of rubber and natural rubber is the key ingredient. These rubber products show well performance for the initial time, but they will degrade after they are exposed to a high temperature circumstance and a cyclic load. NVH performance and comfort in a vehicle were decreased by these degradation of the rubber. In this study, spring displacement in a vehicle was measured to make a profile in the simulation test performed with an acceleration sensor. In addition, acceleration level, rubber permanent deformation and hardness of the rubber were measured according to drive distance and vehicle model.

A Case Study on Smart Concentrations Using ICT Convergence Technology

  • Kim, Gokmi
    • International journal of advanced smart convergence
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    • v.8 no.1
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    • pp.159-165
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    • 2019
  • '4th Industrial Revolution' is accelerating as a core part of creating new growth engines and enhancing competitiveness of businesses. The fourth industrial revolution means the transformation of society and industries that are brought by IoT (Internet of Things), big data analysis, AI (Artificial Intelligence), and robot technology. Information and Communication Technology (ICT), which is a major factor, is affecting production and manufacturing systems and as ICT technologies become more advanced, intelligent information technology is generally utilized in all areas of society, leading to hyper-connected society where new values are created and developed. ICT technology is not just about connecting devices and systems and making smart, it is about constantly converging and harmonizing new technologies in a number of fields and driving innovation and change. It is no exception to the agro-fisheries trade. In particular, ICT technology is applied to the agricultural sector, reducing labor, providing optimal environment for crops, and increasing productivity. Due to the nature of agriculture, which is a labor-intensive industry, it is predicted that the ripple effects of ICT technologies will become bigger. We are expected to use the Smart Concentration using ICT convergence technology as a useful resource for changing smart farms, and to help develop new service markets.

Horizon-AGN virtual observatory: SED-fitting performance and forecasts for future imaging surveys

  • Laigle, Clotilde;Davidzon, I.;Ilbert, O.;Devriendt, J.;Kashino, D.;Capak, P.;Arnouts, S.;De la Torre, S.;Dubois, Y.;Gozaliasl, G.;Leborgne, D.;McCracken, H.J.;Pichon, C.
    • The Bulletin of The Korean Astronomical Society
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    • v.43 no.2
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    • pp.32.3-32.3
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    • 2018
  • We use the synthetic light-cone from the cosmological hydrodynamical simulation Horizon-AGN to produce a mock photometric galaxy catalogue on the redshift range 0

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