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Kim, Jin-Bong
- Study of the Stress Distribution Around a Micro Hole on a Flexible Tube under Lateral Deflection with a Positive Rotation Angle Towards the Micro Defect
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Authors
Affiliations
1 Department of Aeronautical and Mechanical Engineering, Hanseo Univesity, 32158, Korea
1 Department of Aeronautical and Mechanical Engineering, Hanseo Univesity, 32158, Korea
Source
Indian Journal of Science and Technology, Vol 9, No 43 (2016), Pagination:Abstract
Objectives: This study was conducted for the effects of micro holes to stress distribution acting on bellows under lateral deflection with a positive rotation angle toward the micro defect. Methods/Statistical Analysis: Stress was analyzed by F.E.M. (Finite Element Method) and the chosen mesh consisted of 112,800 elements or more. Shell element and nonlinear method were used. The micro hole was located at the top of the first ischolar_main of the neck. Findings: The results show that the stress in the bellows is affected by not only non-symmetrical deformation but also by a combination of the rotation angle and the deflection deformation of the hole as well as the micro hole. The elastic-plastic range around the hole and its relation to the upward lateral deflection and the positive rotation angle was obtained for the bellows in this study. Improvements/Applications: The results are important as they identify the relation between a micro hole and the deformation conditions, and it can be used to improve the quality of bellows.Keywords
Angular Movement, Flexible Tube, Lateral Displacement, Micro Hole, Stress Distribution.Full Text
- Study on the Dynamic Stability of the Excavator Working Device
Abstract Views :167 |
PDF Views:0
Authors
Affiliations
1 Department of Aeromechanical Engineering, Hanseo University, Taean-gun, South Korea
2 Micro Nano Scale Manufacturing Group, Korea Institute of Industrial Technology, Ansan-si, South Korea
1 Department of Aeromechanical Engineering, Hanseo University, Taean-gun, South Korea
2 Micro Nano Scale Manufacturing Group, Korea Institute of Industrial Technology, Ansan-si, South Korea
Source
Indian Journal of Science and Technology, Vol 9, No 44 (2016), Pagination:Abstract
Objectives: The wide variety of possible work excavator, a large vibration occurs in small movements. The main purpose is to damp the vibrations of the excavator of the working device. Methods/Statistical Analysis: In order to verify the damping performance of the excavator of the working device, using the vibration analysis of the working device model, it was to understand the dynamic characteristics. In addition, this study sought a way to reduce vibration caused by the excavator working device using TMD (Tuned Mass Damper). In this study, it conducted a study on the dynamic stability of the excavator of the working device. Findings: It was determined the dynamic characteristics (natural frequencies and mode shapes) of the excavator working device through the modal analysis. In addition, using a numerical analysis, it was possible to determine the vibrational response from the working device. By using this, comparative analysis for vibrational response of the applied the TMD excavator and apply to not excavator. Depending on the vibration damping, and proposed that it is possible to design a more stable excavator. Improvements/Applications: It is suitable for the design of the excavator working device in consideration of the dynamic stability and vibration reduction. In addition, to reduce the operator’s fatigue caused by the vibration of the excavator.Keywords
Damped Vibration, Dynamic Stability, Excavator, Tuned Mass Damper, Working Device.Full Text