Journal of the Korean Society for Precision Engineering

Dynamic Characteristic-based Driving Performance Analysis of a Semi-active Suspension Wheel Module for Small Mobile Robots: Seoyeon Park, Sungjae Kim, Juhyun Pyo, Murim Kim, Jin-Ho Suh; J. Korean Soc. Precis. Eng. 2025;42(11):919-926.
Published online November 1, 2025; DOI: https://doi.org/10.7736/JKSPE.025.069

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This study details the development of a semi-active suspension wheel module for small mobile robots and assesses its dynamic characteristics under various driving conditions through simulation. The wheel module features a low-degree-of-freedom mechanical design and includes a semi-active damper to improve adaptability to different environments. To validate the simulation model, a prototype robot equipped with the wheel module was created, and obstacle-crossing experiments were conducted to measure vertical acceleration responses. The model was then refined based on these experimental results. By employing design of experiments and optimization techniques, the effective range of damping coefficients was estimated. Additionally, simulations were carried out at different speeds, payloads, and obstacle heights to identify optimal damping values and examine their trends. The results indicate that the proposed module significantly enhances driving stability and can serve as a foundation for future control strategies in robotic mobility systems.

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A Study on the High Efficiency and Low Noise Design of Electric Industrial Gearboxes: Nam Yong Kim, Jin-Uk Baek, Sung Ki Lyu; J. Korean Soc. Precis. Eng. 2024;41(4):243-250.
Published online April 1, 2024; DOI: https://doi.org/10.7736/JKSPE.023.099

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Development and research on electric vehicles in power transmission system are increasing as the demand for ecofriendly and autonomous vehicles increases across the industry. In order to reduce noise, research on high efficiency and low noise due to electrification of the gearbox system is being actively conducted, such as applying design technology to optimize the shape of the gear and increase rigidity. In particular, research on low noise is active because the noise of the electric gearbox could be easily recognized in a vehicle, even with small noise due to its frequency characteristics. Therefore, in this study, effects of main specifications of gears on noise and power loss were studied and analyzed through a Parametric Study. Characteristics of the proportional relationship between noise and power loss according to major specifications were analyzed. Based on study results, NVH analysis in the gear system was performed. After that, actual data were secured through test measurements and a noise reduction effect of 4.4 dB was confirmed.

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Multibody Dynamic Analysis for the Lifting-and-Lowering-Type Drone Station including Cable-Pulley Systems: Sang Ho Kim, Jae Youl Lee, Sung-Ho Hong, Jehun Hahm, Kap-Ho Seo, Jin-Ho Suh, Young Sik Joung; J. Korean Soc. Precis. Eng. 2021;38(10):785-792.
Published online October 1, 2021; DOI: https://doi.org/10.7736/JKSPE.021.069

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The lifting-and-lowering type drone station is very useful when lifting and lowering the battery charging station for safe installation, maintenance, and energy efficiency of drone operation. Therefore, understanding the coupling motion between cable and pulley is important for evaluating characteristics like safety and dynamic stability of the lifting-and-lowering type drone station. Although multibody dynamics (MBD) is widely used for numerically analyzing the dynamic behavior of interconnected bodies, attempts to analyze the coupling motion between cable and pulley have been made only recently, within the last decade. Therefore, this paper attempts to develop the MBD model for the lifting-and-lowering type drone station, including cables, pulleys, and winches using MotionSolve (Altair). The results of the winch torque obtained analytically and numerically were compared to verify the effectiveness of the proposed MBD model.

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A Study on Improving the Sensitivity of High-Precision Real-Time Location Receive based on UWB Radar Communication for Precise Landing of a Drone Station
Sung-Ho Hong, Jae-Youl Lee, Dong Ho Shin, Jehun Hahm, Kap-Ho Seo, Jin-Ho Suh
Journal of the Korean Society for Precision Engineering.2022; 39(5): 323. CrossRef

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Torsional Performance Analysis of Oldham Coupling for Harmonic Drive: Joo Yeon Kim, Dae Sung Bae, Jae Duk Jang; J. Korean Soc. Precis. Eng. 2021;38(9):701-705.
Published online September 1, 2021; DOI: https://doi.org/10.7736/JKSPE.021.041

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The robot industry has greatly improved over the past 50 years. It is expected that in the era of the 4th industrial revolution the field of applying robots will expand. Motors are essential in order to operate and control robots. However, robots’ precision requires the application of robot reducers. In particular, many types of harmonic drive reducers have been applied to robots. Harmonic drive reducers have theoretically zero-backlash, but they actually exist for tolerances of Oldham coupling parts. In this paper, dynamic analysis adapted dimensional tolerances of oldham coupling was used to figure out the system backlash characteristics of harmonic drives.

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Method for Radial Stiffness Measurement of Strain Wave Gear Flexspline
Sangwoong Lee, Daegwon Koh, Jong-Geol Kim, Murim Kim
Journal of the Korean Society for Precision Engineering.2024; 41(12): 923. CrossRef

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Structural Behaviors of Large Industrial Door Using Computational Fluid Dynamic and Structural Interaction Analysis: Jae Ho Cha, Sung Ho Yoon; J. Korean Soc. Precis. Eng. 2021;38(6):441-446.
Published online June 1, 2021; DOI: https://doi.org/10.7736/JKSPE.021.014

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In this study, the deformation of a large industrial door subjected to wind load was investigated through computational fluid dynamic and structural analyses. The model for the structural analysis was simplified by considering the PVC curtain and wind bar in the shape of the actual door. The pressure distribution acting on the front of the door was obtained from computational fluid dynamic analysis and the deformation of the door was obtained from structural analysis. According to the results, the pressure distribution was not uniform on the front of the door and varied depending on the location. The distribution of the deflection in the wind bar was obtained and it was found that the position of the maximum deformation occurred slightly above the center of the door. Finally, the deformation of the door could be predicted by analyzing the deflections of the wind bar subjected to different wind speeds through regression analysis.

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A Study on the Plastic Deformation by Collision of a Safety Coupling under Overload: Hyeon Jun Jung, Taek Jin Jang, Byung Ro Kim, Sungmuk Kim, Jong-Bong Kim; J. Korean Soc. Precis. Eng. 2021;38(3):187-193.
Published online March 1, 2021; DOI: https://doi.org/10.7736/JKSPE.020.101

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Plastic deformation of balls in safety coupling by collision with V-Hole was investigated in the current study. Generally, when the applied torque is greater than the maximum allowable torque, balls in V-Hole get out from the holes and the coupling loses the torque transfer capability. After balls are out from the V-Holes, the balls and V-Hole rotate at a different velocity. When balls meet the next V-Hole, they collide into the wall of the V-Hole. Due to this collision, plastic deformation and wear take place. The plastic deformation and wear may reduce the torque transfer capability of the safety coupling. The reduction in torque transfer capability was observed in the experiment. In this study, plastic deformation of balls and flange was investigated through dynamic analysis of the safety coupling. Also, the effect of relative rotational velocity on the plastic deformation was investigated.

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Dynamic Characteristic Evaluation of the Bucket Elevator Chain Pin and Plate: Chang Uk Kim, Dong Woo Lee, Seung Bin Park, Jung Il Song; J. Korean Soc. Precis. Eng. 2017;34(3):211-215.
Published online March 1, 2017; DOI: https://doi.org/10.7736/KSPE.2017.34.3.211

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This research analyzes bucket elevator roller chain pins by finite element (FE) analysis and static structural analysis for a lightweight pin design. The stress distribution of light weight roller chain pins under static load is analyzed for safety factors and damping effect. The results show that the stress distribution is higher on the plate than on the bush pin. In order to compare experimental and FE analysis results, a light weight design approach was used to produce a prototype base pin. Because the inner diameter of the pin was different, the impact damping effect was most appropriate when the inner diameter was 34.05 ㎜, and it is used as basic research data on the impact of the roller chain and sprocket.

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Suitability of Selected Diagnostic Factors for Assessing the Technical Condition of the Working Systems of Bucket Elevators
Piotr Sokolski
Energies.2025; 18(7): 1610. CrossRef
Prediction of the Remaining Useful Life of L-holder for Continuous Ship Unloader
Seung-Hun Lee, Dong-Woo Lee, Jung-Il Song
Journal of the Korean Society for Precision Engineering.2023; 40(8): 647. CrossRef
Development of lightweight fiber-reinforced composite pins for heavy load long pitch roller chains
Chang-Uk Kim, Jung-il Song
Composite Structures.2020; 236: 111839. CrossRef
Evaluation of Critical Crack Length of Tension Bar for Continuous Ship Uploader
Keontae Park, Jang Young Chung, Chang-Sung Seok, Jung-Il Song
Journal of the Korean Society for Precision Engineering.2018; 35(12): 1169. CrossRef
An Evaluation of Wear in High Load Long Pitch Roller Chain
Chang Uk Kim, Jang-Young Chung, Jung Il Song
Journal of the Korean Society for Precision Engineering.2017; 34(9): 647. CrossRef