• Title/Summary/Keyword: mechatronics industry

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A Fracture Mechanics Approach to Adhesively Bonded Joint Using Ultrasonic Signal Analysis (초음파 신호분석을 이용한 접착접합 이음의 파괴역학적 평가)

  • Han, Jun-Young;Oh, Seung-Kyu;Yun, Song-Nam;Lee, Won;Jang, Chul-Sup;Kim, Min-Gun;Kim, Hwan-Tae
    • Journal of Welding and Joining
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    • v.21 no.5
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    • pp.555-560
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    • 2003
  • In automobile industry, it is necessary to reduce the weight from the view point of energy and environmental problems in these days. One of the ways for weight reduction is using adhesive aluminum structures. In this study, ultrasonic signals reflected from the adhesively bonded joint layer are used to evaluate the adhesively bonded joints. FFT is performed to determine bond-layer parameters such as effective thickness and frequency for adhesively bonded joint Al 6061 plates in comparison with the measured and theoretical ratios. And the parameters of ultrasonic wave and the J-integral are investigated to evaluate the adhesively bonded joint strength by DCB specimens.

A Knowledge Workers Acquisition Problem under Expanding and Volatile Demand: An Application of the Korean Information Security Service Industry

  • Park, Hyun-Min;Lim, Dae-Eun;Kim, Tae-Sung;Kim, Kil-Hwan;Kim, Soo-Hyun
    • Management Science and Financial Engineering
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    • v.17 no.1
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    • pp.45-63
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    • 2011
  • The aim of this paper is to consider the process of supplying trained workers with knowledge and skills for upcoming business opportunities and the process of training apprentices to be prepared to meet future demands in an IT service firm. As the demand for new workers fluctuates, a firm should employ a buffer workforce such as apprentices or interns. However, as a result of rapid business development, the capacity of the buffer may be exceeded, thus requiring the company to recruit skilled workers from outside the firm. Therefore, it is important for a firm to map out a strategy for manpower planning so as to fulfill the demands of new business and minimize the operation costs related to training apprentices and recruiting experienced workers. First, this paper analyzes the supply and demand of workers for the IT service in a knowledge-intensive field. It then presents optimal human resource planning strategies via the familiar method of stochastic process. Also, we illustrate that our model is applied to the human resource planning of an information security service firm in South Korea.

Study on Robot based Remote Laser Welding (로봇 기반 원격 레이저 용접에 관한 연구)

  • Kang, Hee-Shin;Suh, Jeong;Cho, Taik-Dong
    • Laser Solutions
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    • v.11 no.4
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    • pp.21-28
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    • 2008
  • Remote Laser welding technology for manufacturing automotive body is studied. Laser welding and industrial robot systems are used for the robot based laser welding system. The laser system is used 1.6kW Fiber laser(YLR-1600) of IPG. The robot system is used HX130-02 of Hyundai Heavy Industry(payload : 130kg). The robot based laser welding system is equipped with laser scanner system for remote laser welding. The welding joints of steel plate and steel plate coated with zinc are butt and lapped joints. The quality test of the laser welding are through the observation the shape of bead on plate and cross-section of welding part. During past three years the laser system, 4kW Nd:YAG laser (HL4006D) of Trumpf was used and the robot system, IRB6400R of ABB (payload:120kg) was used. The new laser source, robot and laser scanner system are used to increase the processing speed and to improve the process efficiency. This paper introduces the robot based remote laser welding system to resolve the limited welding speed and accuracy of the conventional laser welding system.

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A study on Design and Efficient Management of 30kW BIPV System (건물통합형 30kW태양광발전시스템의 설계 및 효율적 운전관리에 관한 연구)

  • Park, Se-Joon;Lim, Jung-Yeol;Yoon, Seok-Am;Cha, In-Su
    • Journal of the Korean Solar Energy Society
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    • v.28 no.3
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    • pp.15-20
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    • 2008
  • Building-integrated photovoltaics(BIPV) are increasingly incorporated into new domestic and industrial buildings as a principal or ancillary source of electrical power, and are one of the fastest growing segments of the photovoltaic industry. This paper presents design, operational features analysis, and PCS(Power Conditioning System) of grid-connected 30kW BIPV set up on the library of Dongshin University. For a sustainable photovoltaics system in this area, the data of the BIPV system are collected and analyzed by monitoring system using LabView. PCS of the grid-connected BIPV system, also, is designed for optimal operation with characteristics suggested in this paper.

A Development of Smart Sensing Device for Monitoring Abnormal Vibration of Industrial Equipment (산업 설비의 이상 진동 감지를 위한 스마트 센싱 디바이스의 개발)

  • Ryu, Dae-Hyun;Choi, Tae-Wan
    • The Journal of the Korea institute of electronic communication sciences
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    • v.12 no.2
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    • pp.361-366
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    • 2017
  • The abnormal state of the main equipment across the industry is accompanied by abnormal rise of temperature, change in the vibration and noise. In this study, we developed a smart sensing module equipped with BLE, and developed a smart sensing device that can detect abnormal vibration due to its own flaws of the equipment by interfacing with an MEMS-based acceleration sensor. The smart sensing device developed in this study can be easily installed in a small space and can monitor the vibration status of the equipment in real time, and can easily inform the user of the steady state and the problem occurrence status with array LED display.

JOINING OF THIN-WALLED ALUMINUM TUBE BY ELECTROMAGNETIC FORMING (EMF)

  • PARK Y.-B.;KIM H.-Y.;OH S.-I.
    • International Journal of Automotive Technology
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    • v.6 no.5
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    • pp.519-527
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    • 2005
  • Recently, weight reduction of vehicles has been of great interest and consequently the use of low-density materials in the automotive industry is increasing every year. However, the substitution of one material for another is not simple because it accompanies several problems, for example, weakness in the strength and stiffness and difficulty in the joining. To overcome these problems, the structure of the automobile redesigned totoally. Aluminum spaceframe is rapidly being adopted as a body structure for accommodating lightness, stiffness and strength requirement. In aluminum spaceframe manufacturing, it is often required to join aluminum tube. However, there are few suitable methods for joining aluminum tube, so that much interest has been focused on testing suitable joining methods. Joining by electromagnetic forming (EMF) can be useful method in joining aluminum tube, which offers some advantages compared with the conventional joining methods. In this paper, joining by EMF was investigated as a pre-study for applying an automotive spaceframe. Finite element simulations and strength tests were performed to analyze the influence of geometric parameters on joint strength. Based on these results, configurations of axial joint and torque joint were suggested and guidelines for designing EMF joint were established.

Minimization of Torque-Ripple in Switched Reluctance Motors Over Wide Speed Range

  • Dowlatshahi, Milad;Saghaiannejad, Seyed Morteza;Ahn, Jin-Woo;Moallem, Mehdi
    • Journal of Electrical Engineering and Technology
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    • v.9 no.2
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    • pp.478-488
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    • 2014
  • Torque pulsation mechanism and highly nonlinear magnetic characterization of switched reluctance motors(SRM) lead to unfavorable torque ripple and limit the variety of applications in industry. In this paper, a modification method proposed for torque ripple minimization of SRM based on conventional torque sharing functions(TSF) to improve maximum speed of torque ripple-free operation considering converter limitations. Due to increasing phase inductance in outgoing phase during the commutation region, reference current tracking can be deteriorated especially when the speed increased. Moreover, phase torque production in incoming phase may not be reached to the reference value near the turn-on angle in which the incremental inductance would be dramatically decreased. Torque error for outgoing phase can cause increasing the resultant motor torque while it would be negative for incoming phase and yields reducing the motor torque. In this paper, a modification method is proposed in which phase torque tracking error for each phase under the commutation added to the other phase so that the resultant torque remained in constant level. This yields to extend constant torque region and reduce peak phase current when the speed increased. Simulation and experimental results for four phase 4 KW, 8/6 SRM validate the effectiveness of the proposed scheme.

Machining characteristics of micro end-mill using high revolution (고속회전을 이용한 마이크로 엔드밀의 가공특성)

  • Kim, Kisoo;Kim, Sangjin;Cho, Byoungmoo;Kim, Hyeungchul
    • 대한공업교육학회지
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    • v.31 no.2
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    • pp.350-363
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    • 2006
  • Recently, the micro end-milling processing is demanded the high-precise technique with good surface roughness and rapid time in milli-structure parts, micro machine parts and molding industry. The cutting conditions of micro end-milling has an effect on surface roughness of cutting surface. Therefore this study was carried out to cut stainless steel using high revolution air bearing spindle and micro end-mill and analyze the cutting condition to get the optimum surface roughness by design of experiment. From this study, surface roughness have an much effect according to priority on depth of cut, revolution of spindle and feed.

An Implementation of Task Switching and Interrupt Handling Mechanisms of OSEK Operating System based on ARM Processor (ARM 프로세서를 기반으로 한 OSEK 운영체제의 태스크 전환 및 인터럽트 핸들링 메커니즘 구현)

  • Rim, Seong-Rak;Kwon, O-Yong
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.12 no.4
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    • pp.1947-1953
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    • 2011
  • OSEK/VDX is a joint project aiming at an industry standard for ECUs in vehicles and OSEK OS is a real-time operating system that meets OSEK/VDX specifications. In this paper, we suggest an implementation of task switching and interrupt handling mechanisms of OSEK operating system based on ARM processors. Considering the requirements of OSEK OS and characteristics of ARM processor, we have designed task switching and interrupt handling mechanisms. For evaluating the validation of the suggested mechanisms, we have checked the functional correctness on an experimental embedded board with ARM processor and calculated the time of task switching and interrupt handling.

Effectiveness Validation on Cold Multi-Stage Forging of Aluminum Inner Tie Rod Socket (알루미늄 이너 타이로드 소켓의 냉간다단단조 유효성 검증)

  • Park, Jae-Wook;Choi, Jong-Won;Jeong, Enn-Eun;Yoon, Il-Chae;Kang, Myungchang
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.21 no.1
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    • pp.49-55
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    • 2022
  • Recently, the automobile industry has continued to demand lighter materials owing to international environmental regulations and increased convenience. To address this demand, aluminum parts have increased in popularity and are mainly developed and produced through hot forging and cold pressing. However, because this method has low yield and low production efficiency, a new manufacturing method is desirable. In this study, the water capacity efficiency of an aluminum inner tie rod socket was investigated using cold forging that provided a high yield and excellent production efficiency. Mechanical properties were derived through tensile testing of 6110A aluminum materials, and critical fracture factor and process analysis based on experimental data were carried out. The optimized process was applied as a prototype using cold multi-stage forging, and based on the derived results, the formability, productivity, and material efficiency of aluminum inner tie rod socket parts using this cold forging process was verified.